Embodiments of this application relate to the field of electronic circuits, and in particular, to a power control circuit and a control method thereof.
An increasingly mature design of a bridgeless power factor correction (PFC) circuit brings an increasingly extensive application market of the bridgeless PFC circuit. The bridgeless PFC circuit may include a single-way bridgeless PFC circuit or a multi-way bridgeless PFC circuit, and a PFC circuit of each way includes a passive component such as an inductive element. Currently, each of a lightning quick-break protection function, a low frequency switch control function, and a current metering function of a conventional bridgeless PFC circuit needs to be implemented by cooperating with a corresponding sampling circuit and control circuit, that is, the conventional bridgeless PFC circuit needs a plurality of sets of sampling and control circuits to achieve a plurality of functions synchronously. Correspondingly, the plurality of sets of circuits need a plurality of sets of components. As a result, a large area of a printed circuit board (PCB) is occupied.
Embodiments of this application provide a power control circuit and a control method thereof. In this method, the power control circuit can implement lightning quick-break protection, low frequency switch control and current metering, and reduce an occupied area of the circuit.
According to a first aspect, an embodiment of this application provides a power control circuit. The power control circuit includes an alternating current power supply module, a power module, and a control module. The alternating current power supply module includes but is not limited to an alternating current power supply, a sampling apparatus, and a switch element. The alternating current power supply may be configured to provide electric energy for the power module. The sampling apparatus is configured to sample a current signal output by the alternating current power supply to the sampling apparatus, or sample a current signal output by the power module to the sampling apparatus, to obtain a sampled signal. The sampling apparatus outputs the obtained sampled signal to the control module. The power module in the power control circuit includes a bridgeless power factor correction PFC circuit. The control module in the power control circuit is configured to: receive the sampled signal output by the sampling apparatus, and control, based on the received sampled signal, on and off of the switch element in the power supply module. When the sampled signal includes a lightning surge signal, the control module is further configured to switch off the switch element. In addition, the control module is further configured to perform current metering on the sampled signal. In this way, in this application, a sampling circuit, that is, the sampling circuit that includes the sampling apparatus and the control module, can implement lightning protection of the switch element, control the on and off of the switch element, and measure a current in the power control circuit, to reduce an occupied area of the power control circuit. This improves utilization of a PCB board to further reduce costs.
For example, the control module is connected to a gate of the switch element, to control on and off of the switch element.
For example, the bridgeless PFC circuit is a single-way bridgeless PFC circuit or a multi-way bridgeless PFC circuit.
For example, a PCF circuit of each way of the multi-way bridgeless PFC circuit includes an inductive element, a pair of switch elements, and a capacitive element. The inductive element and the capacitive element may be used for energy storage and energy supply. For example, the switch element in the bridgeless PFC circuit is an insulated gate bipolar transistor IGBT, a metal-oxide-semiconductor field-effect transistor MOSFET, a silicon carbide SiC transistor, or a gallium nitride GaN transistor.
For example, the sampled signal is optionally a voltage signal obtained by performing sampling by the sampling apparatus based on a current signal.
For example, a current of the alternating current power supply module may come from an external power supply, for example, a mains supply.
For example, the current signal output by the power module to the sampling apparatus is optionally output by an inductive element and/or a capacitive element in the power module to the sampling apparatus.
According to the first aspect, the control module includes a first filtering unit, a lightning quick-break protection unit, a low frequency transistor switch control unit, and a current metering unit. The first filtering unit is connected to a first logic circuit, a second logic circuit, and a third logic circuit, and the first filtering unit is configured to filter the sampled signal. The lightning quick-break protection unit is connected to the first filtering unit by using the first logic circuit. The lightning quick-break protection unit is configured to switch off the switch element when the sampled signal includes the lightning surge signal. The low frequency transistor switch control unit is connected to the first filtering unit by using the second logic circuit. The second logic circuit includes a first signal amplification unit, where the first signal amplification unit amplifies a sampled signal obtained by filtering by the first filtering unit, and outputs an amplified sampled signal to the low frequency transistor switch control unit. The low frequency transistor switch control unit is configured to control on and off of the switch element based on the sampled signal obtained by amplifying by the first signal amplification unit. The current metering unit is connected to the first filtering unit by using the third logic circuit. The third logic circuit includes a second signal amplification unit and a second filtering unit. The second signal amplification unit amplifies the sampled signal obtained by filtering by the first filtering unit, and outputs an amplified sampled signal to the second filtering unit. The second filtering unit filters the sampled signal obtained by amplifying by the second signal amplification unit, and outputs a filtered sampled signal to the current metering unit. The current metering unit is configured to perform current metering on the sampled signal obtained by filtering by the second filtering unit. In this way, the control module in this application can measure a current while implementing lightning protection and switch control, and different functions are implemented without disposing a plurality of circuits, to effectively reducing an occupied area of the circuit.
According to the first aspect or any implementation of the first aspect, the first logic circuit includes a comparison unit. The comparison unit is configured to output indication information to the lightning quick-break protection unit when the sampled signal includes the lightning surge signal. The indication information indicates that the sampled signal includes the lightning surge signal. In this way, the lightning quick-break protection unit performs lightning protection on the switch element in the power supply module based on the indication information of the comparison unit, to prevent the switch element from being damaged.
For example, the comparison unit optionally includes a first comparator and a second comparator. A first threshold is set for the first comparator. The first threshold is used to indicate that a current flowing through the alternating current power supply is a reverse lightning current, and indicates the first comparator to output a high level to the lightning quick-break protection unit. The second comparator is configured to detect a current in a negative half cycle of an input current. A second threshold is set for the second comparator. The second threshold is used to indicate that a current flowing through the alternating current power supply is a reverse lightning current, and indicates the second comparator to output a high level to the lightning quick-break protection unit. The high level is optionally the indication information in this embodiment of this application. In this embodiment of this application, only an example in which the high level is output is used for description. This is not limited in this application.
According to the first aspect or any implementation of the first aspect, an amplification factor of the first signal amplification unit is greater than an amplification factor of the second signal amplification unit. In this way, in this embodiment of this application, the signal amplification units with different amplification factors can meet requirements of the low frequency transistor switch control unit for a large range and low precision, and meet requirements of the metering unit for a small range and high precision.
According to the first aspect or any implementation of the first aspect, the switch element includes a first switch element and a second switch element. The control module is specifically configured to: when the current signal is in a negative half cycle, if the sampled signal is greater than or equal to a first threshold, switch on the first switch element and switch off the second switch element, and if the sampled signal is less than the first threshold, switch off the first switch element, where the second switch element is in an off state, and when the current signal is in the negative half cycle, a current of the alternating current power supply flows from a negative electrode to a positive electrode; or when the current signal is in a positive half cycle, if the sampled signal is greater than or equal to a second threshold, switch on the second switch element and switch off the first switch element, and if the sampled signal is less than the second threshold, switch off the second switch element, where the first switch element is in an on state, an absolute value of the first threshold is equal to an absolute value of the second threshold, and when the current signal is in the positive half cycle, a current of the alternating current power supply flows from a positive electrode to a negative electrode. In this way, the control module can control, based on a direction and a magnitude of the current signal, on and off of the switch element in the power supply module, to implement zero voltage switch conduction of the first switch element and the second switch element, so as to reduce a turn-on loss and a turn-off loss of a power component.
According to the first aspect or any implementation of the first aspect, the control module further includes a protection apparatus. When a lightning surge signal flows into the power control circuit, a loop including the protection apparatus, the sampling apparatus, the switch element, and the alternating current power supply is conducted and the lightning surge signal is transmitted. In this way, the power control circuit may be provided with the protection apparatus, so that the lightning surge signal is transmitted in the loop including the protection apparatus, the sampling apparatus, the switch element, and the alternating current power supply, to prevent the lightning surge signal from flowing into the power module and causing damage to components such as an inductor in the power module and improve the reliability of the power control circuit.
According to the first aspect or any implementation of the first aspect, one terminal of the switch element is connected to the alternating current power supply, and the other terminal of the switch element is connected to the power module; and one terminal of the sampling apparatus is connected to the alternating current power supply, and the other terminal of the sampling apparatus is connected to the control module. In this way, the sampling apparatus is disposed in the power control circuit in this application, so that the control module can implement, based on the sampled signal output by the sampling apparatus, a plurality of functions such as lightning quick-break protection, switch control, and metering, to effectively reduce an occupied area of a PCB.
According to the first aspect or any implementation of the first aspect, the sampling apparatus is a Hall effect sensor, a tunnel magnetoresistance TMR sensor, a resistor, or a current transformer CT.
According to the first aspect or any implementation of the first aspect, the control module includes a triangular current mode TCM controller, a continuous current mode CCM controller, or a critical mode CRM controller.
According to the first aspect or any implementation of the first aspect, the switch element is an IGBT, a MOSFET, a SiC transistor, or a GaN transistor.
According to the first aspect or any implementation of the first aspect, a measuring range of the sampling apparatus is at least twice a rated measuring range. In this way, in this application, the large-range sampling apparatus is disposed, so that a high current signal and a low current signal can be sampled. For example, a lightning current of up to 100 A can be detected, so that the sampling apparatus cannot be damaged when detecting the lightning current. The sampling apparatus can stably output a sampled signal, so that the control module can obtain an accurate sampling result, and perform lightning quick-break protection based on the sampling result. In addition, the large-range sampling apparatus can take into account metering precision of a current within an input current amplitude while increasing a current detection range, thereby reducing an occupied area of a PCB.
According to a second aspect, an embodiment of this application provides a control method of a power control circuit. The power control circuit includes an alternating current power supply module, a power module, and a control module. The alternating current power supply module includes an alternating current power supply, a sampling apparatus, and a switch element. The alternating current power supply provides electric energy for the power module. The power module includes a bridgeless power factor correction PFC circuit. The control method includes the following steps: The sampling apparatus samples a current signal, and outputs an obtained sampled signal to the control module. The control module controls on and off of the switch element based on the sampled signal output by the sampling apparatus, switches off the switch element when the sampled signal includes a lightning surge signal, and performs current metering on the sampled signal.
The second aspect and any implementation of the second aspect respectively correspond to the first aspect and any implementation of the first aspect. For technical effects corresponding to the second aspect or any implementation of the second aspect, refer to the technical effects corresponding to the first aspect or any implementation of the first aspect. Details are not described herein again.
According to a third aspect, an embodiment of this application provides a power control apparatus, including an input port, an output port, and the power control circuit for implementing the first aspect or any possible implementation of the first aspect. The input port is configured to: receive a current output by a power supply module, and transmit the current to the power control circuit. The output port is configured to transmit a current output by the power control circuit to a load device.
The third aspect and any implementation of the third aspect respectively correspond to the first aspect and any implementation of the first aspect. For technical effects corresponding to the third aspect or any implementation of the third aspect, refer to the technical effects corresponding to the first aspect or any implementation of the first aspect. Details are not described herein again.
According to a fourth aspect, an embodiment of this application provides a chip, including one or more interface circuits and one or more processors. The interface circuit is configured to: receive a signal from a memory, and send the signal to the processor, where the signal includes computer instructions stored in the memory. The interface circuit is further configured to receive a sampled signal output by a sampling apparatus, where the sampled signal is obtained by the sampling apparatus by sampling a current signal that is output by an alternating current power supply or a power module to the sampling apparatus. The power module includes a bridgeless power factor correction PFC circuit. When the processor executes the computer instructions, the steps performed by the control module according to any one of claims 1 to 12 are performed.
According to a fifth aspect, an embodiment of this application provides a computer-readable medium, configured to store a computer program. The computer program is configured to perform the steps performed by the control module according to the first aspect or any possible implementation of the first aspect.
According to a sixth aspect, an embodiment of this application provides a computer program. The computer program is configured to perform the steps performed by the control module according to the first aspect or any possible implementation of the first aspect.
The following clearly and completely describes the technical solutions in embodiments of this application with reference to the accompanying drawings in embodiments of this application. It is clear that the described embodiments are some but not all of embodiments of this application. All other embodiments obtained by a person of ordinary skill in the art based on embodiments of this application without creative efforts shall fall within the protection scope of this application.
The power module 120 includes a single-way bridgeless PFC circuit or a multi-way bridgeless PFC circuit. A PFC circuit of each way includes at least one inductive element, at least one capacitive element, and at least one pair of switch elements.
The control module 130 is connected to the alternating current power supply module 110 and the power module 120. The control module 130 may be configured to control, based on a sampled signal output by the sampling apparatus in the alternating current power supply module 110 by sampling a current, on and off of the first switch element and the second switch element in the alternating current power supply module 110, to implement low frequency switch control on the first switch element and the second switch element. The control module 130 may be further configured to implement lightning quick-break protection of the first switch element and the second switch element based on the sampled signal output by the sampling apparatus. In addition, the control module 130 may be further configured to perform current metering based on the sampled signal output by the sampling apparatus.
In this embodiment of this application, the sampling apparatus is a large-range sampling apparatus, for example, a component such as a resistor, a current transformer (CT), a Hall effect sensor, or a tunnel magnetoresistance (TMR) sensor. This is not limited in this application. In this embodiment of this application, to increase a current detection range, a measuring range of the large-range sampling apparatus may be at least twice a rated measuring range. For example, a lightning current of up to 100 A can be detected, so that the sampling apparatus cannot be damaged when detecting the lightning current. The sampling apparatus can stably output a sampled signal, so that the control module 130 can obtain an accurate sampling result, and perform lightning quick-break protection based on the sampling result. In addition, the large-range sampling apparatus can take into account metering precision of a current within an input current amplitude while increasing a current detection range, thereby reducing an occupied area of a PCB.
The following describes in detail the structure of the power control circuit in
As shown in
Still as shown in
For example, an input terminal of the control module 130 is connected to the sampling apparatus, and is configured to receive a sampled signal output by the sampling apparatus. The input terminal of the control module 130 may further be connected to gates of S1H, S1L, S2H, S2L, S1, and S2, to control on and off of each switch element. Optionally, a connection between the control module and each switch element is a signal connection.
For example, in this embodiment of this application, switch elements such as S1H, S1L, S2H, S2L, S1, and S2 may be insulated gate components, for example, an insulated gate bipolar transistor (IGBT) or a metal-oxide-semiconductor field-effect transistor (MOSFET), or a silicon carbide SiC transistor or a gallium nitride GaN transistor. This is not limited in this application.
An input terminal of the primary filter 310 is connected to a sampling apparatus, and an output terminal of the primary filter is separately connected to the first logic circuit 320, the second logic circuit 330, and the third logic circuit 340. The large-range sampling apparatus samples a current signal, to obtain a voltage signal, namely, a sampled signal. It should be noted that the signal collected by the sampling apparatus may be a current signal flowing through the sampling apparatus, for example, may be a current signal input by a power supply to the sampling apparatus. Optionally, the collected signal may alternatively be an electromagnetic signal that does not flow through the sampling apparatus. This is not limited in this application.
The sampling apparatus outputs the sampled signal to the primary filter 310. The input terminal of the primary filter 310 receives the sampled signal, filters the sampled signal, and outputs a filtered sampled signal to the first logic circuit 320, the second logic circuit 330, and the third logic circuit 340.
For example, the first logic circuit 320 includes a comparison unit. In this embodiment of this application, an example in which the comparison unit is a comparator is used for description. In another embodiment, the comparison unit may alternatively be another component that can implement a function of the comparator in this embodiment of this application. This is not limited in this application. For example, one terminal of the comparator is connected to the primary filter 310, and the other terminal is connected to a lightning quick-break protection unit in the control unit 350. An input terminal of the comparator receives a signal input by the primary filter 310 (namely, the sampled signal processed by the primary filter 310). A threshold is set for the comparator, and the threshold is used to indicate that when a signal (namely, a voltage value) is greater than or equal to a threshold, a high level is output, and when a signal is less than the threshold, a low level is output. When the comparator detects that the signal input by the primary filter is greater than or equal to the threshold, the comparator outputs the high level to the lightning quick-break protection unit. When the comparator detects that the signal input by the primary filter is less than the threshold, the comparator outputs the low level to the lightning quick-break protection unit. The lightning quick-break protection unit may determine, based on the level input by the comparator, whether a signal flowing through the sampling apparatus is a lightning surge signal. For example, when the lightning quick-break protection unit receives a high level, it may be determined that the signal flowing through the sampling apparatus is a lightning surge signal. When the lightning quick-break protection unit receives a low level, it may be determined that the signal flowing through the sampling apparatus is not a lightning surge signal. For example, when the lightning quick-break protection unit determines that the signal flowing through the sampling apparatus (it may also be understood as flowing through a bridgeless PFC circuit) is the lightning surge signal, the lightning quick-break protection unit switches off a switch element that is currently in an on state and that is in S1 and S2, thereby implementing lightning quick-break protection and avoiding component damage caused by an excessive current. A specific implementation is described in detail in the following embodiment. It should be noted that, in this embodiment of this application, a manner in which the comparator indicates the lightning surge signal to the lightning quick-break protection unit is merely an example. Alternatively, the comparator may indicate a comparison result to the lightning quick-break protection unit in another manner. This is not limited in this application.
The second logic circuit 330 includes a signal amplifier. One terminal of the signal amplifier is connected to the primary filter 310, and the other terminal is connected to the low frequency transistor switch control unit in the control unit 350. The signal amplifier is configured to: amplify a signal input by the primary filter 310, and output an amplified signal to the low frequency transistor switch control unit. A first threshold and a second threshold are set for the low frequency transistor switch control unit. The first threshold is used to indicate to switch on the second switch element S2 and switch off the first switch element S1. The second threshold is used to indicate to switch on the first switch element S1 and switch off the second switch element S2. Certainly, in another embodiment, the first threshold may alternatively be used to indicate to switch on the first switch element S1 and switch off the second switch element S2. The second threshold is used to indicate to switch on the second switch element S2 and switch off the first switch element S1. This is not limited in this application. If the low frequency transistor switch control unit detects that the signal input by the signal amplifier is greater than or equal to the first threshold, the first switch element S1 is switched on, and the second switch element S2 is switched off. If the low frequency transistor switch control unit detects that the signal input by the signal amplifier is less than or equal to the second threshold, the second switch element S2 is switched on, and the first switch element S1 is switched off. If the low frequency transistor switch control unit detects that the signal input by the signal amplifier is less than the first threshold and greater than the second threshold, the first switch element S1 or the second switch element S2 that is in an on state is switched off. Therefore, zero voltage switch (ZVS) conduction of the first switch element and the second switch element is implemented, to reduce a turn-on loss and a turn-off loss of a power component. It should be noted that, in this embodiment of this application, the first threshold and the second threshold of the low frequency transistor switch control unit may actually be understood as follows: The first threshold is a threshold corresponding to a negative half cycle of an input current, and the second threshold is a threshold corresponding to a positive half cycle of the input current. (Alternatively, the first threshold corresponds to the positive half cycle, and the second threshold corresponds to the negative half cycle. This is not limited in this application.) An absolute value of the first threshold is the same as that of the second threshold. For example, the first threshold is Vth−, the second threshold is Vth+, and absolute values of the first threshold and the second threshold are the same. The low frequency transistor switch control unit performs determining based on the first threshold in the negative half cycle of the input current. For example, when the sampled signal is greater than or equal to the first threshold (Vth−), the first switch element S1 is switched on, and the second switch element S2 is switched off. When the sampled signal is less than the first threshold value (Vth−), the first switch element S1 is switched off. The low frequency transistor switch control unit performs determining based on the second threshold in the positive half cycle of the input current. For example, when the sampled signal is greater than or equal to the second threshold (Vth+), the second switch element S2 is switched on, and the first switch element S1 is switched off. When the sampled signal is less than the second threshold value (Vth+), the second switch element S1 is switched off. It should be noted that, in this embodiment of this application, the positive half cycle of the input current is optionally that a current of an alternating current power supply flows from a positive electrode to a negative electrode, and the negative half cycle is optionally that the current of the alternating current power supply flows from the negative electrode to the positive electrode.
For example, an amplification factor of the signal amplifier in the second logic circuit 330 is less than that of a signal amplifier in the third logic circuit 340. For example, a detection range of the low frequency transistor switch control is usually between 0 V and 3.3 V (namely, a rated working range), and the low frequency transistor switch control unit generally needs to meet a requirement for a large measuring range, and has a low requirement for precision, that is, the low frequency transistor switch control unit has requirements for a large measuring range and low precision. In this embodiment of this application, the large-range sampling apparatus is disposed, so that a signal that exceeds the rated measuring range can be detected, and then a signal amplifier with a smaller amplification factor amplifies the signal. Therefore, a peak voltage of a high current can fall within the detection range of the low frequency transistor switch control unit, to meet the requirements of the low frequency transistor switch control unit for the large measuring range and the low precision.
The third logic circuit 340 includes the signal amplifier and a secondary filter. One terminal of the signal amplifier is connected to the primary filter, and the other terminal is connected to the secondary filter. The signal amplifier is configured to: amplify a signal input by the primary filter 310, and output an amplified signal to the secondary filter. For example, as described above, the amplification factor of the signal amplifier in the third logic circuit 340 is high. Usually, a detection range of a current metering unit is 0 V to 3.3 V due to limitation of a control unit component (for example, a single-chip microcomputer) in which the current metering unit is located. In this embodiment of this application, the signal amplifier with a high amplification factor is used to amplify the signal, to effectively improve metering precision of the current metering unit, so as to meet requirements of the current metering unit for a small measuring range and high precision. It should be noted that, in this embodiment of this application, a specific value of the amplification factor of the signal amplifier may be set based on a requirement of a connected lower-level component, and may be set based on an actual requirement. This is not limited in this application. Still as shown in
For example, the control unit further includes a triangular current mode (TCM) controller, a continuous current mode (CCM) controller, or a critical mode (CRM) controller. This is not limited in this application. In this embodiment of this application, an example in which the control unit 350 includes the TCM controller is used for description. The TCM controller may control each switch element in the power module 120 to be switched on or off, to implement ZVS of a one-way switch element, and reduce a turn-on loss and a turn-off loss of a power component.
For example, the control unit may include discrete components or be a logic device, for example, a complex programmable logic device (CPLD) or a field-programmable gate array (FPGA). Optionally, in this embodiment of this application, a “connection” in the control module is a “signal connection”. For example, a connection between the first logic circuit and the lightning quick-break protection unit may be a signal connection.
For example, in this embodiment of this application, each filter may be a passive filter or an active filter. The passive filter may be an RC filter, and has a plurality of forms such as a first-order filter, a multi-order filter, and a pi-type filter. The active filter mainly uses an active component such as a signal amplifier, and performs signal filtering in combination with a resistance-capacitance parameter. The active filter has a plurality of forms such as a first-order filter, a multi-order filter, a pi-type filter, a Chebyshev filter, and a Butterworth filter. This is not limited in this application.
For example, the power control circuit in this embodiment of this application may be applied to a power control apparatus. Optionally, the power control apparatus may be an AC/DC (Alternating Current (alternating current)/Direct Current (direct current)) module. Alternatively, the power control apparatus may be a blade power supply or the like. This is not limited in this application. The power control apparatus includes an input port and an output port. The input port is configured to receive a current input by a power supply module. The current is optionally an alternating current, and the current may be from a mains supply. The power control circuit in the power control apparatus may process the received current based on the method in this embodiment of this application. In addition, the power control apparatus may output a current to a load device. The current output by the power control apparatus is a direct current.
With reference to
For example, after sampling the current signal, the sampling apparatus outputs a sampled signal to the second logic circuit 330. After processing the sampled signal, the second logic circuit 330 outputs a signal to the low frequency transistor switch control unit. For example, as described above, the first threshold and the second threshold are set for the low frequency transistor switch control unit. In this embodiment of this application, as shown in
Still refer to
Refer to an equivalent circuit diagram shown in
Refer to an equivalent circuit diagram in
Still refer to
Still refer to
The following describes in detail a lightning quick-break protection solution. In this embodiment of this application, the comparator of the first logic circuit 320 includes a first comparator and/or a second comparator. The first comparator is configured to detect a current in a positive half cycle of an input current, and a first threshold is set for the first comparator. The first threshold is used to indicate that a current flowing through the alternating current power supply is a reverse lightning current, and indicates the first comparator to output a high level to the lightning quick-break protection unit. The second comparator is configured to detect a current in a negative half cycle of an input current. A second threshold is set for the second comparator. The second threshold is used to indicate that a current flowing through the alternating current power supply is a reverse lightning current, and indicates the second comparator to output a high level to the lightning quick-break protection unit. For example, in the positive half cycle of the input current, the first comparator determines, based on a comparison between the sampled signal input by the sampling apparatus and the first threshold, whether the current flowing through the alternating current power supply is the reverse lightning current. In an example, if the sampled signal is in reverse phase with an alternating current and exceeds the first threshold, a high level is output to the lightning quick-break protection unit. In another example, if the sampled signal is in phase with an alternating current, a low level is output to the lightning quick-break protection unit. For example, in the negative half cycle of the input current, the second comparator compares the sampled signal input by the sampling apparatus with the second threshold. In an example, if the sampled signal is in reverse phase with an alternating current and exceeds the second threshold, a high level is output to the lightning quick-break protection unit. In another example, if the sampled signal is in phase with an alternating current, a low level is output to the lightning quick-break protection unit. For example, if the lightning quick-break protection unit receives a low level, that is, determines that the current flowing through the alternating current power supply is not the reverse lightning current, the lightning current protection unit does not perform an action. If the lightning quick-break protection unit receives a high level input from the first comparator or the second comparator, the lightning quick-break protection unit may determine that the current flowing through the alternating current power supply is the reverse lightning current. The lightning quick-break protection unit switches off the MOSFET S2 or the MOSFET S1 that is currently in the on state, to avoid damage to the switch element.
The following describes in detail the lightning quick-break protection solution by using a specific example.
For example, refer to
The following describes in detail a current metering solution in this embodiment of this application. Refer to
It should be noted that, in this embodiment of this application, only a two-way bridgeless PFC circuit is used as an example for description. In another embodiment, the solution in this embodiment of this application may be further applied to a single-way bridgeless PFC circuit and a bridgeless PFC circuit with at least two ways. For example, in a three-way bridgeless PFC circuit shown in
It may be understood that, to implement the foregoing functions, an electronic device includes corresponding hardware and/or software modules for performing the functions. With reference to algorithm steps in the examples described in embodiments disclosed in this specification, this application can be implemented in a form of hardware or a combination of hardware and computer software.
In an example,
Components of the apparatus 1000 are coupled together through a bus 1004. In addition to a data bus, the bus 1004 further includes a power bus, a control bus, and a status signal bus. However, for clear description, various buses are referred to as the bus 1004 in the figure.
Optionally, the memory 1003 may be configured to store instructions for the foregoing method embodiment. The processor 1001 may be configured to execute the instructions in the memory 1003, control a receiving pin to receive a signal, and control a sending pin to send a signal. For example, the receiving pin may receive a sampled signal output by a sampling apparatus. The sending pin may be configured to send a control signal, to control on and off of a switch element.
The apparatus 1000 may be the control module in the foregoing method embodiment or a chip in which the control module is located.
All related content of the steps in the foregoing method embodiment may be cited in function descriptions of corresponding functional modules. Details are not described herein again.
An embodiment further provides a computer storage medium. The computer storage medium stores computer instructions. When the computer instructions are run on an electronic device, the electronic device is enabled to perform the foregoing related method steps, to implement the method in the foregoing embodiment.
An embodiment further provides a computer program product. When the computer program product runs on a computer, the computer is enabled to perform the foregoing related steps, to implement the method in the foregoing embodiment.
The electronic device, the computer storage medium, the computer program product, or the chip provided in embodiments is configured to perform the corresponding method provided above. Therefore, for beneficial effects that can be achieved, refer to the beneficial effects of the corresponding method provided above. Details are not described herein again.
The term “and/or” in this specification describes only an association relationship for describing 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.
In the specification and claims in embodiments of this application, the terms “first”, “second”, and so on are intended to distinguish between different objects but do not indicate a particular order of the objects. For example, a first target object and a second target object are used to distinguish between different target objects, but are not used to describe a particular order of the target objects.
In embodiments of this application, the word “example” or “for example” is used to represent giving an example, an illustration, or a description. Any embodiment or design scheme described as an “example” or “for example” in embodiments of this application should not be explained as being more preferred or having more advantages than another embodiment or design scheme. Exactly, use of the word “example”, “for example”, or the like is intended to present a related concept in a specific manner.
In the description of the embodiment of this application, unless otherwise stated, “a plurality of” means two or more than two. For example, a plurality of processing units mean two or more processing units; and a plurality of systems mean two or more systems.
The foregoing describes embodiments of this application with reference to the accompanying drawings. However, this application is not limited to the foregoing specific implementations. The foregoing specific implementations are merely examples, but are not limitative. Inspired by this application, a person of ordinary skill in the art may further make many modifications without departing from the purposes of this application and the protection scope of the claims, and all the modifications shall fall within the protection scope of this application.
Number | Date | Country | Kind |
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202210342890.9 | Apr 2022 | CN | national |
This application is a continuation of International Application No. PCT/CN2023/070609, filed on Jan. 5, 2023, which claims priority to Chinese Patent Application No. 202210342890.9, filed on Apr. 2, 2022. The disclosures of the aforementioned applications are hereby incorporated by reference in their entireties.
Number | Date | Country | |
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Parent | PCT/CN2023/070609 | Jan 2023 | WO |
Child | 18902523 | US |