Patent Application
20240291389
The embodiments relate to the field of power electronics technologies and to an LLC resonant conversion circuit, a charging device, an energy storage device, and a power-consuming device.
With the development of the electric vehicle industry, a battery charging speed is currently one of the main factors that bottleneck the development of electric vehicles. To improve a charging speed of an electric vehicle, a direct current charging pile with a larger power may be configured. However, a power core unit of a charging pile is a charging module. A conventional charging module is usually implemented by using a circuit such as an alternating current/direct current (AC/DC) rectifier unit or a direct current/direct current (DC/DC) rectifier unit. However, as higher requirements are imposed on current conversion efficiency and heat dissipation performance, an existing rectifier circuit cannot meet the requirements. An LLC (which is short for Lr, Lm, and Cr, where Lr is a resonant inductor, Lm is an excitation inductor, and Cr is a resonant capacitor) resonant converter has advantages at least such as high switching frequency, small turn-off losses, high conversion efficiency, low electromagnetic interference noise, and low switching stress, and is therefore widely applied in charging piles.
However, an LLC resonant converter has limited output power, and is generally applied to medium- and low-power products. To achieve higher output power for a charging module, two or more LLC resonant converters may be connected in parallel or in series. However, if a plurality of LLC resonant converters are connected in parallel, current needs to be equalized across the LLC resonant converters. If a plurality of LLC resonant converters are connected in series, voltage needs to be equalized across the LLC resonant converters. To resolve the problem that resonant parameters of output electrical signals are different because of different currents when the LLC resonant converters are connected in parallel or different voltages when the LLC resonant converters are connected in series, a control circuit for current equalization or voltage equalization needs to be added to a circuit that includes the plurality of LLC resonant converters. This undoubtedly increases costs of the entire circuit and results in a complex control policy for the entire circuit.
To resolve the foregoing problem, embodiments provide an LLC resonant conversion circuit, a charging device, an energy storage device, and a power-consuming device. Transformers in resonant circuits in the LLC resonant conversion circuit are connected in a crossed manner. In this way, for the entire LLC resonant conversion circuit, autonomous voltage equalization is implemented in series connection and autonomous current equalization is implemented in parallel connection, without the need to add an extra control circuit. This effectively reduces complexity of a control policy for the entire LLC resonant conversion circuit and reduces costs of the LLC resonant conversion circuit.
Therefore, embodiments use the following solutions:
According to a first aspect, an embodiment provides an LLC resonant conversion circuit, including N harmonic circuits, where N is a positive integer greater than or equal to 2. Each harmonic circuit includes a switch circuit, an LC resonant circuit, a transformer circuit, and a rectifier circuit that are electrically connected in sequence. The transformer circuit includes at least three transformers, and each transformer includes a first winding and a second winding. One terminal of a first winding of each of at least two transformers in a transformer circuit in a first harmonic circuit is electrically connected to an LC resonant circuit in the first harmonic circuit, another terminals of the first windings are electrically connected to each other and are electrically connected to one terminal of a first winding of one transformer in a transformer circuit in another harmonic circuit, and the another harmonic circuit is a harmonic circuit other than the first harmonic circuit among the N harmonic circuits. Alternatively, one terminal of a second winding of each of at least two transformers in a transformer circuit in a first harmonic circuit is electrically connected to a rectifier circuit in the first harmonic circuit, and another terminals of the second windings are electrically connected to each other and are electrically connected to one terminal of a second winding of one transformer in a transformer circuit in another harmonic circuit.
In this implementation, the LLC resonant conversion circuit includes a plurality of harmonic circuits. In each harmonic circuit, a plurality of transformers are electrically connected to each other and are electrically connected to one transformer in another harmonic circuit, so that the harmonic circuits are connected in a crossed manner. In this way, current or voltage of an electrical signal in one harmonic circuit can be distributed to another harmonic circuit. Without adding any component, this achieves the same current value for electrical signals in the harmonic circuits when the harmonic circuits are connected in parallel, and achieves the same voltage value for electrical signals in the harmonic circuits when the harmonic circuits are connected in series. This effectively reduces complexity of a control policy for the entire LLC resonant conversion circuit and also reduces costs of the LLC resonant conversion circuit.
In an implementation, when the switch circuits in the harmonic circuits are connected in parallel, one terminal of a first winding of each of at least two transformers in a first transformer circuit is electrically connected to a first LC resonant circuit, another terminals of the first windings of the at least two transformers are electrically connected to each other and are electrically connected to one terminal of a first winding of a first transformer in a second transformer circuit, and another terminal of the first winding of the first transformer is electrically connected to the first LC resonant circuit. One terminal of a first winding of each of at least two transformers other than the first transformer in the second transformer circuit is electrically connected to a second LC resonant circuit, another terminals of the first windings of the at least two transformers other than the first transformer in the second transformer circuit are electrically connected to each other and are electrically connected to one terminal of a first winding of a second transformer in the first transformer circuit, and another terminal of the first winding of the second transformer is electrically connected to the second LC resonant circuit. The first harmonic circuit includes the first LC resonant circuit and the first transformer circuit, the second transformer is a transformer other than the at least two transformers in the first transformer circuit, the another harmonic circuit includes a second harmonic circuit, and the second harmonic circuit includes the second LC resonant circuit and the second transformer circuit.
In this implementation, when the switch circuits in the N harmonic circuits are connected in parallel, one terminal of a primary-side winding of each of at least two transformers in a transformer circuit in a harmonic circuit is electrically connected to an LC resonant circuit, and another terminals of the primary-side windings are electrically connected to each other and are electrically connected to a primary-side winding of one transformer in a transformer circuit in another harmonic circuit. In this way, current values of the two transformers in the harmonic circuit are equal to a current value of one transformer in each of other harmonic circuits. Then, current values of transformers in each harmonic circuit are added up, and the obtained current values that are output by the rectifier circuits in the harmonic circuits are the same. This implements autonomous current distribution for electrical signals in the harmonic circuits, without adding any component.
In an implementation, one terminal of a second winding of each of at least three transformers in the first transformer circuit is electrically connected to a first rectifier circuit, and another terminals of the second windings of the at least three transformers are electrically connected to each other. One terminal of a second winding of each of at least three transformers in the second transformer circuit is electrically connected to a second rectifier circuit, and another terminals of the second windings of the at least three transformers are electrically connected to each other. The first harmonic circuit includes the first rectifier circuit, and the second harmonic circuit includes the second rectifier circuit.
In this implementation, a second winding of each transformer is connected to a rectifier circuit in parallel, so that the transformers output the same current value. This prevents autonomous current distribution of the entire circuit from being affected by different currents on primary-side windings when currents on secondary-side windings of the transformers are different.
In an implementation, the rectifier circuits in the harmonic circuits are connected in series or connected in parallel.
In this implementation, connecting the rectifier circuits in parallel can improve a current value of the entire LLC resonant conversion circuit, and connecting the rectifier circuits in series can improve a voltage value of the entire LLC resonant conversion circuit.
In an implementation, when the switch circuits in the harmonic circuits are connected in series or in parallel, one terminal of a second winding of each of at least two transformers in a first transformer circuit is electrically connected to a first rectifier circuit, another terminals of the second windings of the at least two transformers are electrically connected to each other and are electrically connected to one terminal of a second winding of a first transformer in a second transformer circuit, and another terminal of the second winding of the first transformer is electrically connected to the first rectifier circuit. One terminal of a second winding of each of at least two transformers other than the first transformer in the second transformer circuit is electrically connected to a second rectifier circuit, another terminals of the second windings of the at least two transformers other than the first transformer in the second transformer circuit are electrically connected to each other and are electrically connected to one terminal of a second winding of a second transformer in the first transformer circuit, and another terminal of the second winding of the second transformer is electrically connected to the second rectifier circuit. The first harmonic circuit includes the first transformer circuit and the first rectifier circuit, the second transformer is a transformer other than the at least two transformers in the first transformer circuit, the another harmonic circuit includes a second harmonic circuit, and the second harmonic circuit includes the second transformer circuit and the second rectifier circuit.
In this implementation, when the switch circuits in the N harmonic circuits are connected in parallel, one terminal of a secondary-side winding of each of two transformers in a transformer circuit in a harmonic circuit is electrically connected to a rectifier circuit, and another terminals of the secondary-side windings are electrically connected to each other and are electrically connected to a secondary-side winding of one transformer in a transformer circuit in another harmonic circuit. In this way, current values of the two transformers in the harmonic circuit are equal to a current value of one transformer in each of other harmonic circuits. Then, current values of transformers in each harmonic circuit are added up, and obtained current values that are output by the rectifier circuits in the harmonic circuits are the same. This implements autonomous current distribution for electrical signals in the harmonic circuits, without adding any component.
When the switch circuits in the N harmonic circuits are connected in series, one terminal of a secondary-side winding of each of two transformers in a transformer circuit in a harmonic circuit is electrically connected to a rectifier circuit, and another terminals of the second-side windings are electrically connected to each other and are electrically connected to a secondary-side winding of one transformer in a transformer circuit in another harmonic circuit. In this way, voltage values at two terminals of the two transformers in the harmonic circuit are equal to voltage values at two terminals of one transformer in each of other harmonic circuits. Then, voltage values of transformers in each harmonic circuit are added up, and obtained voltage values that are output by the rectifier circuits in the harmonic circuits are the same. This implements autonomous voltage distribution for electrical signals in the harmonic circuits, without adding any component.
In an implementation, one terminal of a first winding of each of at least three transformers in the first transformer circuit is electrically connected to a first LC resonant circuit, and another terminals of the first windings of the at least three transformers are electrically connected to each other. One terminal of a first winding of each of at least three transformers in the second transformer circuit is electrically connected to a second LC resonant circuit, and another terminals of the first windings of the at least three transformers are electrically connected to each other. The first harmonic circuit includes the first LC resonant circuit, and the second harmonic circuit includes the second LC resonant circuit.
In this implementation, a first winding of each transformer is connected to an LC resonant circuit in parallel, so that the transformers input the same current value and the same voltage value to second windings. This prevents autonomous current distribution or autonomous voltage distribution of the entire circuit from being affected by different currents or voltages on the second windings when currents or voltages on the first windings of the transformers are different.
In an implementation, the rectifier circuits in the harmonic circuits are connected in parallel.
In this implementation, the rectifier circuits are connected in parallel. This can improve a current value of the entire LLC resonant conversion circuit.
In an implementation, the transformers in each transformer circuit are the same.
In this implementation, the transformers in the transformer circuits are the same. This ensures that the transformers input the same voltage value and the same current value to secondary sides.
In an implementation, the at least three transformers in each transformer circuit share an iron core.
In this implementation, the transformers share one iron core. This avoids different impedances between iron cores of different transformers, so that the transformers input the same voltage value and the same current value to secondary sides.
According to a second aspect, an embodiment provides a two-way three-phase LLC resonant conversion circuit, including a first harmonic circuit and a second harmonic circuit. The first harmonic circuit includes a first switch circuit, a first LC resonant circuit, a first transformer circuit, and a first rectifier circuit that are electrically connected in sequence. The second harmonic circuit includes a second switch circuit, a second LC resonant circuit, a second transformer circuit, and a second rectifier circuit that are electrically connected in sequence. The first switch circuit and the second switch circuit are connected in series. Each switch circuit includes three output ports, each LC resonant circuit includes three resonant inductors and three resonant capacitors, each resonant inductor is connected in series to one resonant capacitor, each transformer circuit includes three transformers, each transformer includes a first winding and a second winding, and each rectifier circuit includes three input ports. Three output ports of the first switch circuit are respectively connected in series to three resonant inductors and three resonant capacitors in the first LC resonant circuit in sequence. Each of two of the three resonant capacitors is electrically connected to one terminal of a first winding of one of two of three transformers in the first transformer circuit in a one-to-one correspondence, and another terminals of the first windings of the two of the three transformers in the first transformer circuit are electrically connected to each other and are electrically connected to one terminal of a first winding of one of three transformers in the second transformer circuit. One terminal of a first winding of the other transformer of the three transformers in the first transformer circuit is electrically connected to one of three resonant capacitors in the second LC resonant circuit, and another terminal of the first winding of the other transformer of the three transformers in the first transformer circuit is electrically connected to one terminal of a first winding of each of the other two of the three transformers in the second transformer circuit. One terminal of a second winding of each of the three transformers in the first transformer circuit is electrically connected to one of three input ports of the first rectifier circuit in a one-to-one correspondence, and another terminals of the second windings of the three transformers in the first transformer circuit are electrically connected to each other. Three output ports of the second switch circuit are respectively connected in series to three resonant inductors and the three resonant capacitors in the second LC resonant circuit in sequence, and the other two of the three resonant capacitors in the second LC resonant circuit are respectively electrically connected to another terminals of the first windings of the other two of the three transformers in the second transformer circuit. One terminal of a second winding of each of the three transformers in the second transformer circuit is electrically connected to one of three input ports of the second rectifier circuit in a one-to-one correspondence, and another terminals of the second windings of the three transformers in the second transformer circuit are electrically connected to each other.
According to a third aspect, an embodiment provides a two-way three-phase LLC resonant conversion circuit, including a first harmonic circuit and a second harmonic circuit. The first harmonic circuit includes a first switch circuit, a first LC resonant circuit, a first transformer circuit, and a first rectifier circuit that are electrically connected in sequence. The second harmonic circuit includes a second switch circuit, a second LC resonant circuit, a second transformer circuit, and a second rectifier circuit that are electrically connected in sequence. Each switch circuit includes three output ports, each LC resonant circuit includes three resonant inductors and three resonant capacitors, each resonant inductor is connected in series to one resonant capacitor, each transformer circuit includes three transformers, each transformer includes a first winding and a second winding, and each rectifier circuit includes three input ports. Three output ports of the first switch circuit are respectively connected in series to three resonant inductors and three resonant capacitors in the first LC resonant circuit in sequence. Each of the three resonant capacitors is electrically connected to one terminal of a first winding of one of three transformers in the first transformer circuit in a one-to-one correspondence, and another terminals of the first windings of the three transformers in the first transformer circuit are electrically connected to each other. One terminal of a second winding of each of two of the three transformers in the first transformer circuit is electrically connected to one of two of three input ports of the first rectifier circuit in a one-to-one correspondence, and another terminals of the second windings of the two of the three transformers in the first transformer circuit are electrically connected to each other and are electrically connected to one terminal of a second winding of one of three transformers in the second transformer circuit. One terminal of a second winding of the other transformer of the three transformers in the first transformer circuit is electrically connected to one of three input ports of the second rectifier circuit, and another terminal of the second winding of the other transformer of the three transformers in the first transformer circuit is electrically connected to one terminal of a second winding of each of the other two of the three transformers in the second transformer circuit. Three output ports of the second switch circuit are respectively connected in series to three resonant inductors and three resonant capacitors in the second LC resonant circuit in sequence, each of the three resonant capacitors is electrically connected to one terminal of a first winding of one of the three transformers in the second transformer circuit in a one-to-one correspondence, and another terminals of the first windings of the three transformers in the second transformer circuit are electrically connected to each other. Another terminal of the second winding of the one of the three transformers in the second transformer circuit is electrically connected to one of the three input ports of the first rectifier circuit, and another terminals of the second windings of the other two of the three transformers in the second transformer circuit are respectively electrically connected to the other two of the three input ports of the second rectifier circuit.
According to a fourth aspect, an embodiment provides a charging device, including at least one LLC resonant conversion circuit according to the possible implementations of the first aspect.
According to a fifth aspect, an embodiment provides an energy storage device, including a battery and at least one LLC resonant conversion circuit according to the possible implementations of the first aspect. The LLC resonant conversion circuit is electrically connected to the battery and is configured to process an electrical signal to be input to the battery, and input a processed electrical signal to the battery.
According to a sixth aspect, an embodiment provides a power-consuming device, including at least one electricity consumption component and at least one LLC resonant conversion circuit according to the possible implementations of the first aspect. The at least one LLC resonant conversion circuit is electrically connected to the at least one electricity consumption component and is configured to process an electrical signal to be input to the at least one electricity consumption component, and input a processed electrical signal to the at least one electricity consumption component.
The following briefly describes the accompanying drawings that need to be used in the descriptions of embodiments or a conventional technology.
The following describes the solutions in embodiments with reference to the accompanying drawings in embodiments.
The term “and/or” in the embodiments describes an association relationship between associated objects and represents that three relationships may exist. For example, A and/or B may represent the following three cases: only A exists, both A and B exist, and only B exists. The character “/” indicates an “or” relationship between the associated objects. For example, A/B indicates A or B.
In the embodiments, the terms “first”, “second”, and the like are intended to distinguish between different objects, but do not indicate a particular order of the objects. For example, a first response message, a second response message, and the like are used to distinguish between different response messages, but do not indicate a particular order of the response messages.
In embodiments, the word “example” or “for example” is used to represent an example, an illustration, or a description. Any embodiment or design scheme described as “example” or “for example” in embodiments should not be explained as being more preferred or more advantageous than another embodiment or design scheme. Exactly, use of the word such as “example” or “for example” is intended to present a relative concept in a specific manner.
In the descriptions of embodiments, unless otherwise specified, “a plurality of” means two or more. For example, a plurality of processing units means two or more processing units, and a plurality of elements means two or more elements.
In each harmonic circuit (100, 200, . . . , or N00), the switch circuit, the LC resonant circuit, the transformer circuit, and the rectifier circuit are electrically connected in sequence. In this way, after an electrical signal that is input by an external circuit passes through the switch circuit, the LC resonant circuit, the transformer circuit, and the rectifier circuit in sequence, a current value or a voltage value of the input electrical signal is increased, thereby increasing power of the input electrical signal.
The harmonic circuits (100, 200, . . . , and N00) may be connected in parallel or in series. For example, for the switch circuits (101, 201, . . . , and N01) in the harmonic circuits (100, 200, . . . , and N00), positive electrodes of the switch circuits may be electrically connected together, and negative electrodes of the switch circuits may be electrically connected together. In this way, the harmonic circuits are connected together in parallel. Alternatively, a positive electrode of a switch circuit may be electrically connected to a negative electrode of a switch circuit on one side, and a negative electrode of the switch circuit may be electrically connected to a positive electrode of a switch circuit on another side, and so on. In this way, the harmonic circuits are connected together in series.
A communicative connection can be established between the switch circuit (101, 201, . . . , or N−1) and an external controller. A control command sent by the controller is received, to control whether to connect an electrical signal that is input to a harmonic circuit and whether to convert the input direct current electrical signal into a square wave electrical signal. For example, as shown in
Optionally, a switching transistor in a switch circuit may include one or more metal-oxide-semiconductor field-effect transistors (MOSFET). A controller is connected to a gate of each MOS to control whether to turn on the gate of each MOS, to turn on or turn off the switching transistor.
In the embodiments, the switch circuit 101 being a three-phase switch circuit is merely used as an example. The switch circuit 101 may alternatively be a two-phase switch circuit or the like based on an actual product requirement. This is not limited. In addition, a circuit structure of another switch circuit (201, . . . , or N01) is generally the same as a circuit structure of the switch circuit 101, and may be different from the circuit structure of the switch circuit 101 based on an actual product requirement. This is not limited.
The LC resonant circuit (102, 202, . . . , or N02) may be connected in series to the transformer circuit (103, 203, . . . , or N03), to form an LLC resonator. A primary-side winding (which is a coil winding on a side that is electrically connected to an LC resonant circuit) of at least one transformer in each transformer circuit may be electrically connected in a crossed manner with a primary-side winding of at least one transformer in another transformer circuit. Alternatively, a secondary-side winding (which is a coil winding on a side that is electrically connected to a rectifier circuit) of at least one transformer in each transformer circuit may be electrically connected in a crossed manner with a secondary-side winding of at least one transformer in another transformer circuit. In this way, current of an electrical signal on a harmonic circuit may be distributed to another one or more harmonic circuits. This implements current equalization for an electrical signal in each harmonic circuit when the harmonic circuits are connected in parallel, and implements voltage equalization for the electrical signal in each harmonic circuit when the harmonic circuits are connected in series.
For example, as shown in
A primary-side winding of each transformer T in the transformer circuit 103 may be connected in series to a resonant capacitor C in the LC resonant circuit 102, or may be connected in series to a resonant capacitor C in another harmonic circuit (202, . . . , or N02), to form an LLC resonator. A circuit obtained by connecting a resonant inductor L and a resonant capacitor C in each group in series in a harmonic circuit may be connected in series to primary-side windings of transformers in different harmonic circuits. In this way, when the switch circuits are connected in parallel, current in each harmonic circuit is evenly distributed to different harmonic circuits, so that current values of electrical signals output by the harmonic circuits are the same. A secondary-side winding of each transformer T in each transformer circuit may be connected in series to a rectifier circuit in a corresponding harmonic circuit.
A secondary-side winding of each transformer T in the transformer circuit 103 may be connected in series to the rectifier circuit 104, or may be connected in series to another rectifier circuit (204, . . . , or N04). In this way, when the switch circuits are connected in parallel, current in each harmonic circuit is evenly distributed to different harmonic circuits, so that current values of electrical signals output by the harmonic circuits are the same. When the switch circuits are connected in series, voltage in each harmonic circuit is evenly distributed to different harmonic circuits, so that voltage values at two terminals of all the transformer circuits are the same. A primary-side winding of each transformer T in each transformer circuit may be connected in series with an LC resonant circuit in a corresponding harmonic circuit.
In the embodiments, in each harmonic circuit (100, 200, . . . , or N00), a quantity of LC resonant sets in an LC resonant circuit is the same as a quantity of input ports P of a switch circuit, and a quantity of transformers in a transformer circuit is the same as the quantity of LC resonators in the LC resonant circuit.
Transformers in a transformer circuit may use identical transformers, such as transformers with the same impedance and the same quantity of turns for a primary-side winding and a secondary-side winding. Optionally, a transformer is not limited to a structure shown in
A rectifier circuit (104, 204, . . . , or N−4) is connected in series to a transformer circuit, to convert an alternating current electrical signal input by the transformer circuit into a direct current electrical signal. For example, as shown in
In the embodiments, the rectifier circuits (104, 204, . . . , and N−4) may be connected together in parallel. Current values of electrical signals in the rectifier circuits are aggregated to increase a current value of an output electrical signal. The rectifier circuits in the harmonic circuits may alternatively be connected together in series. In this way, voltage values of electrical signals in the rectifier circuits are connected in series to increase a voltage value of an output electrical signal.
In the embodiments, in each harmonic circuit (100, 200, . . . , or N00), a quantity of diode groups that are connected in parallel in a rectifier circuit is the same as a quantity of input ports P of a switch circuit, and also the same as a quantity of transformers in a transformer circuit.
The LLC resonant conversion circuit in this embodiment includes a plurality of harmonic circuits. In each harmonic circuit, a plurality of transformers are electrically connected to each other and are electrically connected to one transformer in another harmonic circuit, so that the harmonic circuits are connected in a crossed manner. In this way, current or voltage of an electrical signal in one harmonic circuit can be distributed to another harmonic circuit. Without adding any component, this achieves the same current value for electrical signals in the harmonic circuits when the harmonic circuits are connected in parallel, and achieves the same voltage value for electrical signals in the harmonic circuits when the harmonic circuits are connected in series. This effectively reduces complexity of a control policy for the entire LLC resonant conversion circuit and also reduces costs of the LLC resonant conversion circuit.
The following describes solutions in the embodiments based on different LLC resonant conversion circuits.
With reference to the two-way three-phase LLC resonant conversion circuit shown in
When the first switch circuit 101 and the second switch circuit 201 are connected in parallel, voltage values of electrical signals that are input to the first harmonic circuit 100 and the second harmonic circuit 200 are the same. However, current values of the electrical signals that pass through the first harmonic circuit 100 and the second harmonic circuit 200 may be different, so that resonant parameters of electrical signals that are output by the first rectifier circuit 104 and the second rectifier circuit 204 are different. As a result, an electrical signal that is output by the two-way three-phase LLC resonant conversion circuit cannot provide an electrical signal for a power-consuming device.
In the embodiments, to achieve the same current value for the electrical signals that pass through the first harmonic circuit 100 and the second harmonic circuit 200, two LC resonant circuits may be connected in a crossed manner to a primary-side winding of each transformer in two transformer circuits. A specific connection manner is as follows.
In the first transformer circuit 103, one terminal of a transformer T11 is connected in series to a resonant capacitor C12 in the first LC resonant circuit 102, one terminal of a transformer T12 is connected in series to a harmonic capacitor C13 in the first LC resonant circuit 102, and another terminal of the transformer T11 and another terminal of the transformer T12 are electrically connected to each other and are electrically connected to one terminal of a transformer T23 in the second transformer circuit 203. One terminal of a transformer T13 is connected in series to a harmonic capacitor C24 in the second LC resonant circuit 202, and another terminal of the transformer T13 is electrically connected to one terminal of a transformer T21 in the second transformer circuit 203 and one terminal of a transformer T22. Another terminal of the transformer T21 in the second transformer circuit 203 is connected in series to a harmonic capacitor C22 in the second LC resonant circuit 202, and another terminal of the transformer T22 is connected in series to a harmonic capacitor C23 in the second LC resonant circuit 202.
A connection manner between two rectifier circuits and a secondary-side winding of each transformer in two transformer circuits may be as follows.
In the first transformer circuit 103, one terminal of a transformer T11 is connected in series to an input port P14 of the first rectifier circuit 104, one terminal of a transformer T12 is connected in series to an input port P15 of the first rectifier circuit 104, one terminal of a transformer T13 is connected in series to an input port P16 of the first rectifier circuit 104, and another terminal of the transformer T11, another terminal of the transformer T12, and another terminal of the transformer T13 are electrically connected to each other. In the second transformer circuit 203, one terminal of a transformer T21 is connected in series to an input port P24 of the second rectifier circuit 204, one terminal of a transformer T22 is connected in series to an input port P25 of the second rectifier circuit 204, one terminal of a transformer T23 is connected in series to an input port P26 of the second rectifier circuit 204, and another terminal of the transformer T21, another terminal of the transformer T22, and another terminal of the transformer T23 are electrically connected to each other. After being extended, a line between a rectifier circuit and a secondary-side winding of a transformer assumes a “Y” shape. Therefore, this connection manner may be referred to as a Y-shaped connection manner.
Denote a current of a primary-side winding of the transformer T11 as IAT11 (where a current value is a vector here and hereinafter), a current of a secondary-side winding of the transformer T11 as IBT11, a current of a primary-side winding of the transformer T12 as IAT12, a current of a secondary-side winding of the transformer T12 as IBT12, a current of a primary-side winding of the transformer T13 as IAT13, a current of a secondary-side winding of the transformer T13 as IBT13, a current of a primary-side winding of the transformer T21 as IAT21, a current of a secondary-side winding of the transformer T21 as IBT21, a current of a primary-side winding of the transformer T22 as IAT22, a current of a secondary-side winding of the transformer T22 as IBT22, a current of a primary-side winding of the transformer T23 as IAT23, and a current of a secondary-side winding of the transformer T23 as IBT23. IAT11, IAT12, and IAT13 are of different phases, and IAT11 and IBT11 are of the same phases. A relationship between other currents is obtained by analogy. Optionally, a phase difference between IAT11, IAT12, and IAT13 is 120°.
For primary-side windings of two transformer circuits, the transformer T11 and the transformer T12 are electrically connected to each other and are electrically connected to the transformer T23. Therefore, IAT11+IAT12=IAT23. The transformer T21 and the transformer T22 are electrically connected to each other and are electrically connected to the transformer T13. Therefore, IAT21+IAT22=IAT13. IAT11, IAT12, and IAT23 are of different phases, and IAT21, IAT22, and IAT13 are also of different phases.
For secondary-side windings of transformers in the first transformer circuit 103, the transformer T11, the transformer T12, and the transformer T13 are electrically connected to each other. Therefore, for the first harmonic circuit 100, a total current I1=IBT11+IBT12+IBT13=n·IAT11+n·IAT12+n·IAT13. Similarly, for secondary-side windings of transformers in the second transformer circuit 203, in the second harmonic circuit 200, 12=IBT21+IBT22+IBT223=n·IAT21+n·IAT22+n·IAT23. When a quantity of turns of a primary-side winding and that of a secondary-side winding are the same in each transformer, I1=I2. In this case, current values of the first harmonic circuit 100 and the second harmonic circuit 200 are the same, thereby implementing autonomous current equalization among the harmonic circuits in the two-way three-phase LLC resonant conversion circuit.
In this embodiment, two transformers in the first transformer circuit are electrically connected to each other, and then electrically connected to one transformer in the second transformer circuit, so that currents of the two transformers in the first transformer circuit are equal to a current of the one transformer in the second transformer circuit. Similarly, two transformers in the second transformer circuit are electrically connected to each other, and then electrically connected to one transformer in the first transformer circuit, so that currents of the two transformers in the second transformer circuit are equal to a current of the one transformer in the first transformer circuit. In this way, a current of the first transformer circuit is equal to a current of the second transformer circuit, thereby implementing autonomous current equalization among circuits in the two-way three-phases LLC resonant conversion circuit.
For example, as shown in
In the first transformer circuit 103, one terminal of the transformer T11, one terminal of the transformer T12, and one terminal of the transformer T13 are electrically connected to each other, another terminal of the transformer T11 is electrically connected to an input port P14 of the first rectifier circuit 104, another terminal of the transformer T12 is electrically connected to an input port P15 of the first rectifier circuit 104, another terminal of the transformer T13 is electrically connected to an input port P16 of the first rectifier circuit 104. In the second transformer circuit 203, one terminal of the transformer T21, one terminal of the transformer T22, and one terminal of the transformer T23 are connected together in parallel, another terminal of the transformer T21 is electrically connected to an input port P24 of the second rectifier circuit 204, another terminal of the transformer T22 is electrically connected to an input port P25 of the second rectifier circuit 204, and another terminal of the transformer T23 is electrically connected to an input port P26 of the second rectifier circuit 204. After being extended, a line between an LC resonant circuit and a transformer assumes a “A” shape. Therefore, this connection manner may be referred to as a A-shaped connection manner.
For secondary-side windings of transformers in the first transformer circuit 103, the transformer T11, the transformer T12, and the transformer T13 are electrically connected to each other. Therefore, for the first harmonic circuit 100, a total current I1=IBT11+IBT12+IBT13=n·IAT11+n·IAT12+n·IAT13. Similarly, for secondary-side windings of transformers in the second transformer circuit 203, in the second harmonic circuit 200, 12=IBT21+IBT22+IBT223=n·IAT21+n·IAT22+n·IAT23. When a quantity of turns of a primary-side winding and that of a secondary-side winding are the same in each transformer, I1=I2. In this case, current values of the harmonic circuits are the same, thereby implementing autonomous current equalization among the harmonic circuits in the two-way three-phase LLC resonant conversion circuit.
With reference to
In the first transformer circuit 103, one terminal of a transformer T11 is electrically connected to an input port P14 of the first rectifier circuit 104, one terminal of a transformer T12 is electrically connected to an input port P15 of the first rectifier circuit 104, another terminal of the transformer T11 and another terminal of the transformer T12 are electrically connected to each other and electrically connected to one terminal of a transformer T23 in the second transformer circuit 203. One terminal of a transformer T13 is electrically connected to an input port P26 of the second rectifier circuit 204, and another terminal of the transformer T13 is electrically connected to one terminal of a transformer T21 and one terminal of a transformer T22 in the second transformer circuit 203. Another terminal of the transformer T21 in the second transformer circuit 203 is electrically connected to an input port P24 of the second rectifier circuit 204, and another terminal of the transformer T22 is electrically connected to an input port P25 of the second rectifier circuit 204.
A connection manner between two rectifier circuits and a primary-side winding of each transformer in two transformer circuits may be a Y-shaped connection manner. The following provides an example.
In the first transformer circuit 103, one terminal of a transformer T11 is connected in series to a harmonic capacitor C12 in the first LC resonant circuit 102, one terminal of a transformer T12 is connected in series to a harmonic capacitor C13 in the first LC resonant circuit 102, one terminal of a transformer T13 is connected in series to a harmonic capacitor C14 in the first LC resonant circuit 102, and another terminal of the transformer T11, another terminal of the transformer T12, and another terminal of the transformer T13 are electrically connected to each other. In the second transformer circuit 203, one terminal of a transformer T21 is connected in series to a harmonic capacitor C22 in the second LC resonant circuit 202, one terminal of a transformer T22 is connected in series to a harmonic capacitor C23 in the second LC resonant circuit 202, one terminal of a transformer T23 is connected in series to a harmonic capacitor C24 in the second LC resonant circuit 202, and another terminal of the transformer T21, another terminal of the transformer T22, and another terminal of the transformer T23 are electrically connected to each other.
For secondary-side windings of two transformer circuits, the transformer T11 and the transformer T12 are electrically connected to each other and are electrically connected to the transformer T23. Therefore, IBT11+IBT12=IBT23. The transformer T21 and the transformer T22 are electrically connected to each other and are electrically connected to the transformer T13. Therefore, IBT21+IBT22=IBT13. For the first harmonic circuit 100, a total current I1=IBT11+IBT12+IBT13. For the second harmonic circuit 200, a total current I2=IBT21+IBT22+IBT23. Therefore, I1=I2. In this case, current values of the harmonic circuits are the same, thereby implementing autonomous current equalization among the harmonic circuits in the two-way three-phase LLC resonant conversion circuit. IBT11, IBT12, and IBT23 are of different phases, and IBT21, IBT22, and IBT13 are also of different phases.
In the embodiments, as an example in
With reference to an N-way three-phase LLC resonant conversion circuit shown in
In a first transformer circuit 103, one terminal of a transformer T11 is connected in series to a harmonic capacitor C12 in a first LC resonant circuit 102, one terminal of a transformer T12 is connected in series to a harmonic capacitor C13 in the first LC resonant circuit 102, and another terminal of the transformer T11 and another terminal of the transformer T12 are electrically connected to each other and then electrically connected to one terminal of a transformer T23 in a second transformer circuit 203, . . . , and one terminal of a transformer TN3 in an Nth transformer circuit N03 in sequence. In this way, each harmonic circuit includes a current of IBT11+IBT12. Two terminals of a transformer T13 in the first transformer circuit 103 are both electrically connected to a node obtained by electrically connecting a transformer T21 and a transformer T22 in the second transformer circuit 203, . . . , and a node obtained by electrically connecting a transformer TN1 and a transformer TN2 in the Nth transformer circuit N03. In this way, each harmonic circuit includes a current of IBT21+IBT22+ . . . +IBTN1+IBTN2. Therefore, a current of each harmonic circuit is I=IBT11+IBT12+IBT21+IBT22+ . . . +IBTN1+IBTN2, such as the current values of the harmonic circuits are the same, thereby implementing autonomous current equalization among the harmonic circuits in the N-way three-phase LLC resonant conversion circuit.
In the embodiments, as an example in
In the embodiments, as an example in
It should be noted that in
In a solution of
With reference to a two-way three-phase LLC resonant conversion circuit shown in
When the first switch circuit 101 and the second switch circuit 201 are connected in series, current values of electrical signals that pass through the first harmonic circuit 100 and the second harmonic circuit 200 are the same. However, voltage values of electrical signals that are input to the first harmonic circuit 100 and the second harmonic circuit 200 may be different, so that resonant parameters of electrical signals that are output by the first rectifier circuit 104 and the second rectifier circuit 204 are different. As a result, an electrical signal that is output by the two-way three-phase LLC resonant conversion circuit cannot provide an electrical signal for a power-consuming device.
In the embodiments, to achieve the same voltage value for the electrical signals that pass through the first harmonic circuit 100 and the second harmonic circuit 200, two rectifier circuits may be connected in a crossed manner to a secondary-side winding of each transformer in two transformer circuits. A specific connection manner is as follows.
In the first transformer circuit 103, one terminal of a transformer T11 is electrically connected to an input port P14 of the first rectifier circuit 104, one terminal of a transformer T12 is electrically connected to an input port P15 of the first rectifier circuit 104, another terminal of the transformer T11 and another terminal of the transformer T12 are electrically connected to each other and electrically connected one terminal of a transformer T21 in the second transformer circuit 203, and one terminal of a transformer T13 is electrically connected to an input port P24 of the second rectifier circuit 204.
In the second transformer circuit 203, another terminal of the transformer T21 is electrically connected to an input port P16 of the first rectifier circuit 104, one terminal of a transformer T22 is electrically connected to an input port P25 of the second rectifier circuit 204, one terminal of a transformer T23 is electrically connected to an output port P23 of the second rectifier circuit 204, and another terminal of the transformer T22 and another terminal of the transformer T23 are electrically connected to each other and are electrically connected to another terminal of the transformer T13 in the first transformer circuit 103.
A connection manner between two rectifier circuits and a primary-side winding of each transformer in two transformer circuits may be a Y-shaped connection manner. An example is described as follows.
In the first transformer circuit 103, one terminal of a transformer T11 is connected in series to a harmonic capacitor C12 in the first LC resonant circuit 102, one terminal of a transformer T12 is connected in series to a harmonic capacitor C13 in the first LC resonant circuit 102, one terminal of a transformer T13 is connected in series to a harmonic capacitor C14 in the first LC resonant circuit 102, and another terminal of the transformer T11, another terminal of the transformer T12, and another terminal of the transformer T13 are electrically connected to each other. In the second transformer circuit 203, one terminal of a transformer T21 is connected in series to a harmonic capacitor C22 in the second LC resonant circuit 202, one terminal of a transformer T22 is connected in series to a harmonic capacitor C23 in the second LC resonant circuit 202, one terminal of a transformer T23 is connected in series to a harmonic capacitor C24 in the second LC resonant circuit 202, and another terminal of the transformer T21, another terminal of the transformer T22, and another terminal of the transformer T23 are electrically connected to each other.
Denote a voltage of a primary-side winding of the transformer T11 as VAT11, a voltage of a secondary-side winding of the transformer T11 as VBT11, a voltage of a primary-side winding of the transformer T12 as VAT12, a voltage of a secondary-side winding of the transformer T12 as VBT12, a voltage of a primary-side winding of the transformer T13 as VAT13, a voltage of a secondary-side winding of the transformer T13 as VBT13, a voltage of a primary-side winding of the transformer T21 as VAT21, a voltage of a secondary-side winding of the transformer T21 as VBT21, a voltage of a primary-side winding of the transformer T22 as VAT22, a voltage of a secondary-side winding of the transformer T22 as VBT22, a voltage of a primary-side winding of the transformer T23 as VAT23, and a voltage of a secondary-side winding of the transformer T23 as VBT23. VAT11, VAT12, and VAT13 are of different phases, and VAT11 and VBT11 are of the same phases. A relationship between other currents is obtained by analogy. Optionally, a phase difference between VAT11, VAT12, and VAT13 is 120°.
For secondary-side windings of two transformer circuits, the another terminal of the transformer T11, the another terminal of the transformer T12, and the another terminal of the transformer T13 are electrically connected to each other. Therefore, VAT11=VAT12=VAT13. Similarly, the another terminal of the transformer T21, the another terminal of the transformer T22, and the another terminal of the transformer T23 are electrically connected to each other. Therefore, VAT21=VAT22=VAT23. In addition, VAT11=n·VBT11, VAT12=n·VBT12, VAT13=n·VBT13, VAT21=n·VBT21, VAT22=n·VBT22, and VAT23=n·VBT23. When a quantity of turns of a primary-side winding and that of a secondary-side winding are the same in each transformer, VBT11=VBT12=VBT13=VB1, and VBT21=VBT22=VBT23=VB2.
The transformer T11 and the transformer T12 are electrically connected to each other, and are electrically connected to the transformer T21. Therefore, for the first harmonic circuit 104, an output voltage V1=√{square root over (6)}·VBT11=√{square root over (6)}·VB1. Similarly, the transformer T22 and the transformer T23 are electrically connected to each other, and are electrically connected to the transformer T13. Therefore, for the second harmonic circuit 204, an output voltage V2=√{square root over (6)}·VBT21=√{square root over (6)}VB2. The voltage value V1 of the first harmonic circuit 100 and the voltage value V2 of the second harmonic circuit 200 are the same, thereby implementing autonomous voltage equalization among the harmonic circuits of the two-way three-phase LLC resonant conversion circuit.
As shown in
In a first transformer circuit 103, one terminal of a transformer T11 is electrically connected to an input port P14 of a first rectifier circuit 104, one terminal of a transformer T12 is electrically connected to an input port P15 of the first rectifier circuit 104, and another terminal of the transformer T11 and another terminal of the transformer T12 are electrically connected to each other and then electrically connected to one terminal of a transformer T21 in a second transformer circuit 203, . . . , and one terminal of a transformer TN1 in an Nth transformer circuit N03 in sequence. In this way, for the first harmonic circuit 100, a voltage V1=√{square root over (6)}·VBT11. In the second transformer circuit 203, one terminal of a transformer T22 is electrically connected to an input port P25 of a second rectifier circuit 204, one terminal of a transformer T23 is electrically connected to an input port P26 of the second rectifier circuit 204, and another terminal of the transformer T22 and another terminal of the transformer T23 are electrically connected to each other and then electrically connected to one terminal of a transformer T13 in the first transformer circuit 103, . . . , and one terminal of a transformer TN3 in the Nth transformer circuit N03 in sequence. In this way, for the second harmonic circuit 100, a voltage V2=√{square root over (6)}·VBT21=V1. By analogy, it can be obtained that V1=V2= . . . =VN. In other words, voltage values of the harmonic circuits are the same. This can implement autonomous voltage equalization for the harmonic circuits in the N-way three-phase LLC resonant conversion circuit.
In the embodiments, as an example in
An embodiment provides a charging device. The charging device includes an LLC resonant conversion circuit. The LLC resonant conversion circuit may be the LLC resonant conversion circuit recorded in
An embodiment provides an energy storage device. The energy storage device includes an LLC resonant conversion circuit and a battery. The LLC resonant conversion circuit is electrically connected to the battery and is configured to process an electrical signal to be input to the battery, and input a processed electrical signal to the battery. The LLC resonant conversion circuit may be the LLC resonant conversion circuit recorded in
An embodiment provides a power-consuming device. The power-consuming device includes an LLC resonant conversion circuit and at least one electricity consumption component. The LLC resonant conversion circuit is connected to the at least one electricity consumption component and is configured to process an electrical signal to be input to the at least one electricity consumption component, and input a processed electrical signal to the at least one electricity consumption component. The LLC resonant conversion circuit may be the LLC resonant conversion circuit recorded in
In the embodiments, specific features, structures, materials, or characteristics may be combined in a proper manner in any one or more of embodiments or examples.
It should be noted that the foregoing embodiments are merely intended for describing solutions, but are not limiting. Although described in detail with reference to the foregoing embodiments, persons of ordinary skill in the art should understand that they may still make modifications to the solutions described in the foregoing embodiments or make equivalent replacements to some features thereof, without departing from the scope of the solutions of the embodiments.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202111300517.9 | Nov 2021 | CN | national |
This application is a continuation of International Application No. PCT/CN2022/103844, filed on Jul. 5, 2022, which claims priority to Chinese Patent Application No. 202111300517.9, filed on Nov. 4, 2021. The disclosures of the aforementioned applications are hereby incorporated by reference in their entireties.
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/CN2022/103844 | Jul 2022 | WO |
| Child | 18654559 | US |
