This application claims priority to and/or benefit of Chinese No. 2021111661652, filed Sep. 30, 2021, entitled CHARGING DEVICE, the specification of which is incorporated by reference herein in its entirety.
The present disclosure relates to a field of charging management technology, and particularly to a charging device.
At present, when a charging device is connected to a battery by using a connector, a differential voltage loop exists between the connector and the battery, which causes arc oxidation of a terminal contact.
When the charging device charges the battery with a large current, an area of the contact gradually decreases when the connector is gradually disconnected from the battery, so that an arc is generated at the moment of disconnection, thereby oxidizing a metal part of the terminal contact. An increase in resistance value of the contact surface for a long time leads to heat generation of the terminal contact, which will easily cause fire and irreparable losses.
In view of the above, it is necessary to provide a charging device, which avoids the terminal oxidation problem caused by the arc generated when the charging device is plugged in and unplugged, so as to improve safety and the service life of the charging device.
A charging device provided by the embodiments of the present disclosure, includes:
an LLC half-bridge resonant power supply; an input end of the LLC half-bridge resonant power supply is configured to be connected to a power supply, an output end of the LLC half-bridge resonant power supply is connected to an input end of a first switch in the normally open state, and an output end of the first switch is configured to be connected to a battery to be charged;
a charging interface, configured to be connected to the battery to be charged, and provided with an engage-enabled pin and a charge-enabled pin; the length of the charge-enabled pin is smaller than the length of a communication-enabled pin and the engage-enabled pin, respectively;
a charging management circuit; a first end of the charging management circuit is connected to an end of the engage-enabled pin, a second end of the charging management circuit is connected to an end of the charge-enabled pin, and a third end of the charging management circuit is connected to a controlled end of the first switch;
the charging management circuit is configured to control the LLC half-bridge resonant power supply to soft start when the battery to be charged is in contact with the engage-enabled pin during a process of plugging the charging interface into the battery to be charged; the charging management circuit is further configured to control the first switch to be turned on when another end of the charge-enabled pin of the charging interface is in contact with the battery to be charged to cause the LLC half-bridge resonant power supply to charge the battery to be charged; and
the charging management circuit is configured to control a primary side of the LLC half-bridge resonant power supply to stop operating when the charge-enabled pin is disconnected from the battery to be charged during a process of unplugging the charging interface from the battery to be charged.
In an embodiment, the LLC half-bridge resonant power supply includes:
a resonant half-bridge control circuit; an input end of the resonant half-bridge control circuit is configured to be connected to the power supply;
a primary side resonant circuit; an input end of the primary side resonant circuit is configured to be connected to the power supply, and a controlled end of the primary side resonant circuit is connected to a control end of the resonant half-bridge control circuit;
a secondary side rectifier circuit; an input end of the secondary side rectifier circuit is coupled to the primary side resonant circuit, an output end of the secondary side rectifier circuit is connected to the input end of the first switch;
an output control circuit; a controlled end of the output control circuit is connected to the third end of the charging management circuit, and a control end of the output control circuit is connected to a control end of the first switch; and
a charging output circuit; an end of the charging output circuit is connected to the output end of the first switch, and another end of the charging output circuit is configured to be connected to the battery to be charged.
In an embodiment, the charging device further includes:
a first optical coupler; a light emitter of the first optical coupler is connected to the fourth end of the charging management circuit, and a light receiver of the first optical coupler is connected to the burst mode operation threshold setting end of the resonant half-bridge control circuit;
the charging management circuit is configured to, during the process of unplugging the charging interface from the battery to be charged, when the charge-enabled pin is disconnected from (i.e., is not in contact with) the battery to be charged, output a signal from the fourth end of the charging management circuit to make the light emitter operate, causing the light receiver of the first optical coupler to pull potential at the burst mode operation threshold setting end to a low level when receiving a light signal emitted by the light emitter; and
when the burst mode operation threshold setting end is at a low level, the resonant half-bridge control circuit enters an idle state to cause the primary side resonant circuit to stop operating.
In an embodiment, the resonant half-bridge control circuit is an HR1000 model controller.
In an embodiment, the charging device further includes:
a voltage follower circuit; an input end of the voltage follower circuit is connected to the fourth end of the charging management circuit, and the potential at an output end of the voltage follower circuit is the same as the potential to which the input end of the voltage follower circuit is applied; and
a feedback amplifier circuit; an input end of the feedback amplifier circuit is connected to the input end of the voltage follower circuit, and an output end of the feedback amplifier circuit is connected to light emitter of the first optical coupler.
In an embodiment, the first switch is a relay, and the output control circuit includes:
a first transistor; a base of the first transistor is connected to the third end of the charging management circuit, an emitter of the first transistor is grounded, and a collector of the first transistor is connected to a coil of the first switch;
the third end of the charging management circuit outputs high level to trigger the first transistor to be turned on when the other end of the charge-enabled pin of the charging interface is in contact with the battery to be charged;
the collector of the first transistor triggers the coil to cause the first switch to be turned on, and the LLC half-bridge resonant power supply charges the battery to be charged.
In an embodiment, the charging output circuit includes:
a first filter circuit; an input end of the first filter circuit is connected to the output end of the first switch; and
a fuse protection circuit; an input end of the fuse protection circuit is connected to an output end of the first filter circuit, and an output end of the fuse protection circuit is configured to be connected to the battery to be charged.
In an embodiment, the charging device further includes:
a power factor correction power supply; an input end of the power factor correction power supply is configured to be connected to the power supply, and an output end of the power factor correction power supply is connected to the input end of the resonant half-bridge control circuit and the input end of the primary side resonant circuit.
In an embodiment, the charging device further includes:
an input rectification filter circuit, connected in series between the power supply and the power factor correction power supply.
In an embodiment, the charging device further includes:
a logic device power supply conversion circuit; an input end of the logic device power supply conversion circuit is configured to be connected to the output end of the power factor correction power supply; and an output end of the logic device power supply conversion circuit is connected to the LLC half-bridge resonant power supply and the charging management circuit, respectively, and configured to convert the output voltage of the power factor correction power supply to an operating voltage applicable for the LLC half-bridge resonant power supply and the charging management circuit.
The charging device provided by the embodiments of the present disclosure at least has the following beneficial effects. By providing a charge-enabled pin and an engage-enabled pin with different lengths in the charging interface of the charging device and using the charging management ability of the charging management circuit in the charging device, the first end of the charging management circuit is connected to an end of the engage-enabled pin, the second end of the charging management circuit is connected to an end of the charge-enabled pin, and the third end of the charging management circuit is connected to the controlled end of the first switch. When charging, since the charge-enabled pin is the shortest, the engage-enabled pin is firstly in contact with the battery. When the battery is in contact with the engage-enabled pin, the electrical signal received by the first end of the charging management circuit connected to the other end of the engage-enabled pin is changed. When the charging management circuit detects the change, it controls the LLC half-bridge resonant power supply to soft start. During the soft start process of the LLC half-bridge resonant power supply, the charge-enabled pin contacts the battery later. The electrical signal received by the second end of the charging management circuit connected to the other end of the charge-enabled pin is changed under the effect of the battery. The charging management circuit detects the change, and the third end thereof outputs a signal, which applies to the controlled end of the first switch, to drive the first switch to be turned on. At this time, the output end of the LLC half-bridge resonant power supply charges the battery to be charged to achieve a charging soft start and zero-voltage connection.
When the charging process is completed, since the charge-enabled pin is the shortest, the charge-enabled pin is firstly removed from the battery to be charged during the process of unplugging the charging interface. At this time, the charging management circuit can detect the disconnection of the charge-enabled pin from the battery by the change of the signal received by the second end. At this time, the fourth end of the charging management circuit outputs a signal to the burst mode operation threshold setting end of the LLC half-bridge resonant power supply to trigger the primary side of the LLC half-bridge resonant power supply to stop operating. At this time, the engage-enabled pin is further disconnected from the battery. Since the primary side of the LLC half-bridge resonant power supply has stopped operating at this time, zero-current disconnection is achieved, thereby avoiding the oxidation problem of the contact surface caused by the arc generated during the hot plugging process, and improving the service life and safety of the charging device.
To illustrate the technical solution in the embodiments of the present disclosure or related art more clearly, the accompanying drawings for describing the embodiments or the prior art are introduced briefly in the following. Apparently, the accompanying drawings in the following description only represent some embodiments of the present disclosure, and persons of ordinary skill in the art can derive other drawings from the accompanying drawings without creative efforts.
In order to facilitate the understanding of the present disclosure, a more comprehensive description of the present disclosure will be made with reference to the relevant drawings in the followings. The embodiments of the present disclosure are shown in the drawings. However, the present disclosure can be implemented in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these examples is to make the disclosure more thorough and comprehensive.
Unless otherwise specified, all the technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present disclosure. The terminology used in the specification of the present disclosure herein is only for the purpose of describing specific embodiments, and is not intended to limit the present disclosure.
It can be understood that the terms “first”, “second” and the like used in the present disclosure can be used herein to describe various elements, and these elements are not limited by these terms. These terms are only used to distinguish the first element from another element. For example, without departing from the scope of the present disclosure, a first resistance may be referred to as a second resistance, and similarly, the second resistance may be referred to as the first resistance. Both the first resistor and the second resistor are resistors, but they are not the same resistor.
It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuit, module, unit and the like has the transmission of electrical signal or data between each other.
The singular forms of “a”, “an”, and “the” can also include plural forms when they are used herein, unless otherwise specified clearly in the context. It should be also be understood that the terms “include/comprise” or “have/has” and the like specify the existence of the stated features, wholes, steps, operations, components, parts or their combinations, but do not exclude the possibility of the existence or addition of one or more other features, wholes, steps, operations, components, parts or their combinations.
To address the problems specified in the background, in an embodiment, a charging device is provided. As shown in
In addition, a first end of the above charging management circuit 60 is connected to an end of the engage-enabled pin, a second end of the charging management circuit 60 is connected to an end of the charge-enabled pin, and a third end of the charging management circuit is connected to a controlled end of the first switch 30.
Since the length of the charge-enabled pin is relatively short, during the process of plugging the charging interface 50 into the battery 40 to be charged, the charging management circuit 60 can firstly control the LLC half-bridge resonant power supply 20 to soft start when the battery 40 to be charged is in contact with the engage-enabled pin. At this time, the battery has not been charged yet. When the other end of the charge-enabled pin of the charging interface 50 is further in contact with the battery 40 to be charged, the charging management circuit 60 controls the first switch to be turned on, so that the LLC half-bridge resonant power supply 20 charges the battery 40 to be charged so as to achieve zero-voltage connection and soft start charging. In addition, during the process of unplugging the charging interface 50 from the battery 40 to be charged, the charging management circuit 60 controls the primary side of the LLC half-bridge resonant power supply 20 to stop operating when the charge-enabled pin is disconnected from the battery 40 to be charged (i.e., the charge-enabled pin is not in contact with the battery 40 to be charged). At this time, no current is output to the battery 40 to be charged. At this time, the engage-enabled pin of the charging interface 50 is further unplugged and the circuit connection between the LLC half-bridge resonant power supply 20 and the battery is disconnected to achieve zero-current disconnection, thereby avoiding arc oxidation of the contact caused by the differential voltage loop between the connector and the battery during plugging and unplugging process when charging, so as to improve the service life, safety, and product reliability of the charging device. An output pin of the LLC half-bridge resonant power supply 20 can be fixed and integrated in the charging interface 50, and the length of the output pin of the LLC half-bridge resonant power supply 20 is also less than the length of the charge-enabled pin in the charging interface 50.
In an embodiment, as shown in
When the charging interface 50 and the output end of the LLC half-bridge resonant power supply 20 are connected with the battery 40 to be charged, the output end of the LLC half-bridge resonant power supply 20 can be integrated in the charging interface 50, and the length of the charge-enabled pin is kept shortest compared to the lengths of other pins in the charging interface 50. The charging management circuit 60 controls the resonant half-bridge control circuit 21 to operate when the engage-enabled pin is in contact with the battery. The on/off of a transistor in the primary side resonant circuit 22 is controlled by the resonant half-bridge control circuit 21. The secondary side rectifier circuit 23 is coupled to the primary side resonant circuit 22, and rectifies the voltage coupled by the secondary side to generate a DC power suitable for charging the battery. The DC power generated is transmitted to the output circuit 25 after passing through the first switch 30. Since the charge-enabled pin has not yet contacted the battery at the beginning, the first switch 30 is in an off state. At this time, only the resonant half-bridge control circuit 21 performs the voltage conversion of the primary side resonant circuit 22 and the secondary side rectifier circuit 23 in the soft start mode, and when the charging interface 50 is plugged in tightly, the change of the signal received by the charge-enabled pin triggers the third end of the charging management circuit 60 to output a signal to the output control circuit 24, so that the output control circuit 24 drives the first switch 30 to be turned on. At this time, the DC power generated by the secondary side rectifier circuit 23 is transmitted to the output circuit 25 through the first switch 30, and the battery is charged through the output circuit 25.
In an embodiment, in order to improve the stability of the electrical signal output to the battery, a filter circuit is also connected in series to the output end of the secondary side rectifier circuit 23. For example, it can be a filter circuit composed of C23, C24, C25, and C26 as shown in
In an embodiment, the charging device further includes a first optical coupler, and a light emitter of the first optical coupler is connected to a fourth end of the charging management circuit 60. A light receiver of the first optical coupler is connected to a burst mode operation threshold setting end of the resonant half-bridge control circuit 21, respectively. During the process of unplugging the charging interface 50 from the battery 40 to be charged, the charging management circuit 60 is configured to, when the charge-enabled pin is disconnected from the battery 40 to be charged, the fourth end of the charging management circuit 60 outputs a signal to be applied to the light emitter, so as to cause the light emitter to operate, so that the burst mode operation threshold setting end is pulled to a low level by the light receiver of the first optical coupler when receiving the light signal emitted by the light emitter. When the burst mode operation threshold setting end is at a low level, the resonant half-bridge control circuit 21 enters an idle state to cause the primary side resonant circuit 22 to stop operating.
Based on the above direct or indirect relationship between the first optical coupler connected to the burst mode operation threshold setting end BURST of the resonant half-bridge control circuit 21 and the fourth end of the charging management circuit 60, the charge-enabled pin is firstly disconnected from the battery 40 to be charged due to its short length during the process of unplugging the charging interface 50 from the battery 40 to be charged when the charging is completed, and in the charging management circuit 60, the signal received by the second end connected to the charge-enabled pin jumps from a low level to a high level. At this time, the fourth end (which can be a Vpwm signal output by the pin 56 of the STM32 chip as shown in
In an embodiment, the resonant half-bridge control circuit 21 is an HR1000 model controller. Specifically, it can also be an HR1000A model controller. When the resonant half-bridge control circuit 21 of such model is selected, as shown in
As shown in
In an embodiment, the charging device further includes a voltage follower circuit and a feedback amplifier circuit. An input end of the voltage follower circuit is connected to the fourth end of the charging management circuit 60, and the potential at an output end of the voltage follower circuit is the same as the potential to which the input end is applied. An input end of the feedback amplifier circuit is connected to the input end of the voltage follower circuit, and an output end of the feedback amplifier circuit is connected to light emitter of the first optical coupler.
The voltage follower circuit refers to a circuit whose input potential is the same as the output potential, and it is a circuit that functions as voltage follower and isolation. For example, it can be a circuit composed of a resistor R107, a resistor R108, a capacitor C93, and a capacitor C94 as shown in
In an embodiment, as shown in
In an embodiment, as shown in
An input end of the first filter circuit is connected to the output end of the first switch 30. For example, as shown in
In an embodiment, as shown in
In an embodiment, as shown in
In an embodiment, as shown in
Considering the differences in the voltage required for the operation of each chip device, in an embodiment, as shown in
The power factor correction power supply and the logic device power supply conversion circuit as shown in
According to the charging device provided by the embodiments of the present disclosure, by providing a charge-enabled pin and an engage-enabled pin with different lengths in the charging interface 50 of the charging device and using the charging management ability of the charging management circuit 60, the first end of the charging management circuit 60 is connected to an end of the engage-enabled pin, the second end of the charging management circuit 60 is connected to an end of the charge-enabled pin, and the third end of the charging management circuit 60 is connected to the controlled end of the first switch 30. When charging, since the charge-enabled pin is the shortest, the engage-enabled pin is firstly in contact with the battery. When the battery is in contact with the engage-enabled pin, the electrical signal received by the first end of the charging management circuit 60 connected to the other end of the engage-enabled pin is changed. When the charging management circuit 60 detects the change, it controls the LLC half-bridge resonant power supply 20 to soft start. During the soft start process of the LLC half-bridge resonant power supply 20, the charge-enabled pin contacts the battery later. The electrical signal received by the second end of the charging management circuit 60 connected to the other end of the charge-enabled pin is changed under the effect of the battery. The charging management circuit 60 detects the change, and the third end thereof outputs a signal, which applies to the controlled end of the first switch 30, to drive the first switch 30 to be turned on. At this time, the output end of the LLC half-bridge resonant power supply 20 charges the battery 40 to be charged to achieve charging soft start and zero-voltage connection.
When the charging process is completed, since the charge-enabled pin is the shortest, the charge-enabled pin is firstly removed from the battery 40 to be charged during the process of unplugging the charging interface 20. At this time, the charging management circuit 60 can detect the disconnection of the charge-enabled pin from the battery by the change of the signal received by the second end. At this time, the fourth end of the charging management circuit 60 outputs a signal to the burst mode operation threshold setting end of the LLC half-bridge resonant power supply 20 to trigger the primary side of the LLC half-bridge resonant power supply 20 to stop operating. At this time, the engage-enabled pin is further disconnected from the battery. Since the primary side of the LLC half-bridge resonant power supply 20 has stopped operating at this time, zero-current disconnection is achieved, thereby avoiding the oxidation problem of the contact surface caused by the arc generated during the hot plugging process, and improving the service life and safety of the charging device.
In the description of the present specification, the description of the reference terms “some embodiments”, “other embodiments”, “ideal embodiments” and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present disclosure. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.
The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the various technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered as the scope of this specification.
The above embodiments only express several embodiments of the present disclosure. The descriptions are more specific and detailed, but they should not be understood as limiting the scope of the disclosure. It should be pointed out that for those ordinary skilled in the art, without departing from the concept of the present disclosure, several modifications and improvements can also be made and these all fall within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the appended claims.
Number | Date | Country | Kind |
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202111166165.2 | Sep 2021 | CN | national |