CN214045126U - Battery charging circuit and battery management system - Google Patents
Battery charging circuit and battery management system Download PDFInfo
- Publication number
- CN214045126U CN214045126U CN202023102750.XU CN202023102750U CN214045126U CN 214045126 U CN214045126 U CN 214045126U CN 202023102750 U CN202023102750 U CN 202023102750U CN 214045126 U CN214045126 U CN 214045126U
- Authority
- CN
- China
- Prior art keywords
- electronic switch
- circuit
- battery
- path
- inductor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model provides a battery charging circuit and battery management system, battery charging circuit is applied to battery management system, including first interface end, second interface end, exciton circuit, control sub-circuit and battery, exciton circuit includes the transformer, first electronic switch, first inductance and first diode, wherein, the transformer includes primary winding and secondary winding, and the first passageway at primary winding place is established ties and is provided with first inductance and first electronic switch, and one end of first passageway is connected with the negative pole electricity of battery, and the other end is connected with second interface end electricity; a first diode is arranged on a second passage where the secondary winding is arranged in series, one end of the second passage is electrically connected with the first interface end, and the other end of the second passage is electrically connected with the cathode of the battery; the control sub-circuit is electrically connected with the first electronic switch; the control sub-circuit is used for controlling the on-off of the first electronic switch according to the current of the first path. The embodiment of the utility model provides a can promote the security that the battery charges.
Description
Technical Field
The utility model relates to a battery technology field especially relates to a battery charging circuit and battery management system.
Background
In the current energy storage application, in order to prevent the charging current from being too large when the voltage difference between the charging voltage and the battery voltage is large, a Battery Management System (BMS) needs a current limiting function, the charging current is limited in the constant current charging stage, and the charging safety is improved.
The current limiting scheme commonly used at present generally adopts a BOOST topology circuit for boosting. Since the voltage of the battery will increase during the charging process, and the voltage difference between the charging voltage and the battery voltage will decrease under the condition that the charging voltage is kept constant, the driving duty ratio will approach to 1, and the phenomena such as short circuit and the like are easily caused. It can be seen that, in the existing scheme, when the charging voltage is large and the voltage difference between the charging voltage and the battery is small, the charging safety is low.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a battery charging circuit and battery management system to solve the lower problem of prior art charging security.
In a first aspect, an embodiment of the present invention provides a battery charging circuit applied to a battery management system, including a first interface terminal, a second interface terminal, a flyback sub-circuit, a control sub-circuit, and a battery, where the flyback sub-circuit includes a transformer, a first electronic switch, a first inductor, and a first diode, where,
the transformer comprises a primary winding and a secondary winding, the first inductor and the first electronic switch are arranged on a first path where the primary winding is located in series, one end of the first path is electrically connected with the negative electrode of the battery, and the other end of the first path is electrically connected with the second interface end; a first diode is arranged on a second passage where the secondary winding is arranged in series, one end of the second passage is electrically connected with the first interface end, and the other end of the second passage is electrically connected with the cathode of the battery;
the control sub-circuit is electrically connected with the first electronic switch;
the control sub-circuit is used for controlling the on-off of the first electronic switch according to the current of the first access.
Optionally, the control sub-circuit comprises a Micro Control Unit (MCU) chip, and the MCU chip is electrically connected with the first electronic switch;
the MCU chip drives the first electronic switch to be conducted through a driving signal and controls the on-off frequency of the first electronic switch by controlling the duty ratio of the driving signal.
Optionally, the control sub-circuit further includes an integrated circuit IC chip, and the MCU chip is electrically connected to the first electronic switch through the IC chip;
the MCU chip indicates the IC chip to generate a driving current through a driving signal so as to drive the first electronic switch to be conducted; the MCU chip controls the on-off frequency of the first electronic switch by controlling the duty ratio of the driving signal.
Optionally, the flyback sub-circuit further includes a shunt, the shunt is serially connected to the first path and electrically connected to the MCU chip, and is configured to collect a current of the first path, convert a current signal of the first path into a voltage signal, and transmit the voltage signal to the MCU chip.
Optionally, the flyback sub-circuit further comprises a second inductor, a third inductor and a fourth inductor, the second inductor and the third inductor are arranged in series in the first path, and the fourth inductor is arranged in series in the second path;
the second inductor, the third inductor and the fourth inductor are three-phase common mode inductors;
the flyback sub-circuit further includes a first capacitor disposed between the negative electrode of the battery and the second interface end and connected in parallel with the first via.
Optionally, the flyback sub-circuit further includes a second diode and a second capacitor, the second diode is disposed in series on the second path and is located between the first diode and the first interface end, and the second capacitor is disposed between the first diode and the second diode and is connected in parallel with the second path.
Optionally, the flyback sub-circuit further includes a third capacitor, and the third capacitor is disposed between the first inductor and the primary winding and is connected in parallel with the first path.
Optionally, the number of the third capacitors is 3.
Optionally, the first electronic switch is a field effect MOS transistor.
In a second aspect, the embodiment of the present invention further provides a battery management system, including second electronic switch, third electronic switch and any one of the above mentioned battery charging circuit, the battery in the battery charging circuit is connected in series with the second electronic switch and the third electronic switch, just the second electronic switch set up in the low side of the battery management system, the third electronic switch set up in the high side of the battery management system.
The embodiment of the utility model provides a realize carrying out the current-limiting charging to the battery through exciton circuit and control sub-circuit, because adopt the transformer to step up in the exciton circuit, consequently in the charging process, charging voltage and battery voltage difference reduce gradually, nevertheless because the exciton circuit can adjust the voltage relation of former secondary winding according to the turn ratio of the former secondary winding of transformer, realize stepping up to make the exciton circuit can work in lower duty cycle, thereby security when having promoted the battery and having charged.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a circuit diagram of a battery charging circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of the transient current of the first path as a function of time provided by an embodiment of the present invention;
fig. 3 is a schematic control flow diagram provided by an embodiment of the present invention;
fig. 4 is a schematic diagram of a battery management system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which the invention belongs. The use of "first," "second," and similar terms in the description herein do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.
Referring to fig. 1 to 4, the present invention provides a battery charging circuit applied to a battery management system, including a first interface terminal 101, a second interface terminal 102, a flyback sub-circuit including a transformer 210, a first electronic switch 220, a first inductor 230 and a first diode 240, a control sub-circuit, and a battery 400, wherein,
the transformer 210 includes a primary winding 211 and a secondary winding 212, the first inductor 230 and the first electronic switch 220 are arranged in series on a first path where the primary winding 211 is located, one end of the first path is electrically connected to the negative electrode of the battery 400, and the other end of the first path is electrically connected to the second interface terminal 102; a first diode 240 is arranged in series on a second path where the secondary winding 212 is located, one end of the second path is electrically connected with the first interface end 101, and the other end of the second path is electrically connected with the negative electrode of the battery 400;
the control sub-circuit is electrically connected to the first electronic switch 220;
the control sub-circuit is used for controlling the on-off of the first electronic switch 220 according to the current of the first path.
In the embodiment of the present invention, the charger may be electrically connected to the first interface end 101 and the second interface end 102, respectively, to charge the battery 400. The constant current charging process is a charging process in which the average value of the charging current is constant, and the charging process is divided into two stages according to the on and off of the first electronic switch 220.
Referring to fig. 1, a-a path of a primary winding 211-b is a first path and c-a path of a secondary winding 212-d is a second path in fig. 1. When the first electronic switch 220 is turned on, the battery 400 and the first path are divided, and a charging current flows through the battery 400 and the first path to charge the battery 400. In the first path, since the charging voltage between the first interface terminal 101 and the second interface terminal 102 is kept constant, the current of the first path linearly increases by the input voltage, and the induced electromotive force of the primary winding 211 is applied to both ends of the first diode 240 of the secondary side by electromagnetic induction. It should be understood that, as shown in fig. 1, according to the guiding arrangement of the primary and secondary sides in fig. 1 and the first diode 240, the first diode 240 can be ensured to be in the reverse cut-off state, thereby preventing the second path from being conducted. Meanwhile, the first inductor 230 stores a part of the electric energy.
When the first electronic switch 220 is turned off, the current of the first path does not abruptly change to 0 but gradually decreases with the turn-off time due to the induced current of the first inductor 230. At this time, the induced current generates an induced electromotive force in the primary winding 211 opposite to that generated when the first electronic switch 220 is turned on, and is applied to the secondary side by electromagnetic induction, so that the first diode 240 is turned on in a forward direction, and a current flows through the second path and the battery 400 to charge the battery 400. In other words, when the first electronic switch 220 is turned off, the electric energy stored in the first inductor 230 is transmitted to the battery 400 through the transformer 210.
Since the charging voltage needs to be greater than the terminal voltages of the two ends of the battery 400 during the charging process, the number of turns of the primary winding 211 is smaller than that of the secondary winding 212, so as to boost the voltage. In the process of constant current charging, the control sub-circuit controls the on/off of the first electronic switch 220 to control the average value of the first path current, thereby avoiding the problem of overlarge charging current caused by overlarge voltage difference between the charging voltage and the voltage of the battery 400.
It will be appreciated that the longer the on-time of the first electronic switch 220, the higher the instantaneous maximum value of the current in the first path, resulting in a higher average value of the current in the first path, and vice versa a lower average value of the current in the first path. Therefore, the current of the first path, that is, the average value of the charging current can be controlled by controlling the driving duty of the exciton circuit.
Specifically, the control sub-circuit may control the on/off of the first electronic switch 220 by sending a driving signal. When the first electronic switch 220 is turned on, since the current of the first path varies linearly, the average value of the current can be obtained through the instantaneous maximum value of the current, the control sub-circuit can collect the instantaneous value of the current of the first path in a preset period and compare the instantaneous value with a preset reference value, and when the instantaneous value of the current is smaller than the preset reference value, the control sub-circuit can increase the duty ratio of the driving signal, so that the turn-on time of the first electronic switch 220 in the period is increased until the instantaneous value of the current of the first path is equal to the preset reference value, thereby limiting the average value of the charging current to be kept constant.
Since the voltage of the battery 400 gradually increases during the charging process and the voltage difference between the charging voltage and the voltage of the battery 400 decreases, the input voltage of the flyback sub-circuit gradually decreases. In other words, the first path voltage is reduced, which may cause the current of the first path to decrease, and the control sub-circuit may adopt the above method to increase the duty ratio of the driving signal, thereby increasing the average value of the charging current. Of course, in some embodiments, the control sub-circuit may also decrease the duty cycle of the driving signal, thereby decreasing the average value of the charging current, which is not limited herein.
It should be noted that, a Continuous Conduction Mode (CCM) and a Discontinuous Conduction Mode (DCM) exist in the flyback circuit, and in the continuous Conduction Mode, the current of the first path does not drop to zero during the time when the first electronic switch 220 is turned off, and the energy of the primary inductor is not completely transmitted to the secondary capacitor. In order to simplify the calculation, the exciton circuit in the embodiment of the present invention may operate in the DCM mode, in which the current of the first path is substantially as shown in fig. 2, and the average value of the current may be obtained according to the area of the triangle, so the calculation is simple.
The embodiment of the utility model provides a realize carrying out the current-limiting charging to battery 400 through exciton circuit and control sub-circuit, because adopt transformer 210 to boost in the exciton circuit, consequently in the charging process, the charging voltage reduces gradually with battery 400 voltage difference, nevertheless because the exciton circuit can adjust the voltage relation of former secondary winding 212 according to the turn ratio of the former secondary winding 212 of transformer 210, realize stepping up, thereby make the exciton circuit can work in lower duty cycle, thereby security when having promoted battery 400 and having charged.
In addition, because adopt transformer 210 to boost in the exciton circuit, under the great condition of charging voltage, for example under the condition that many strings of batteries 400 charge, through the embodiment of the utility model provides a, only need to adjust the turn ratio of transformer 210 primary and secondary winding 212 to adjust the voltage of primary and secondary winding 212, just can make the exciton circuit work in lower duty cycle, security when further having promoted battery 400 and charging.
Optionally, the control sub-circuit may include a Micro Controller Unit (MCU) chip, and the MCU chip 310 is electrically connected to the first electronic switch 220;
the MCU chip 310 drives the first electronic switch 220 to be turned on by a driving signal, and controls the on/off frequency of the first electronic switch 220 by controlling the duty ratio of the driving signal.
Further, the control sub-Circuit may further include an Integrated Circuit (IC) chip, and the MCU chip 310 is electrically connected to the first electronic switch 220 through the IC chip 320;
the MCU chip 310 instructs the IC chip 320 to generate a driving current through a driving signal to drive the first electronic switch 220 to be turned on; the MCU chip 310 controls the on/off frequency of the first electronic switch 220 by controlling the duty ratio of the driving signal.
In the embodiment of the present invention, the MCU chip 310 can be used to send a driving signal according to the collected current value of the charging circuit, and the driving signal makes the first electronic switch 220 turned on. Since the driving capability of the MCU chip 310 is weak and may not generate enough driving current to turn on the first electronic switch 220, referring to fig. 3, the MCU chip 310 may transmit a driving signal to the IC chip 320, and the IC chip 320 transmits the driving current according to the driving signal, so that the driving current turns on the first electronic switch 220, thereby reducing the failure rate of the flyback sub-circuit.
Specifically, the types of the MCU chip 310 and the IC chip 320 may be set according to actual needs. In the embodiment of the present invention, the MCU chip 310 may adopt a model including, but not limited to, S9KEAZ _128 to implement the above functions, and the IC chip 320 may adopt a model including, but not limited to, UCC _27517 to implement the above functions, which is not further limited herein.
Further, the flyback sub-circuit may further include a shunt 250, where the shunt 250 is serially disposed on the first path and electrically connected to the MCU chip 310, and is configured to collect a current of the first path, convert a current signal of the first path into a voltage signal, and transmit the voltage signal to the MCU chip 310.
In the embodiment of the present invention, the shunt 250 can be regarded as a resistor with a smaller resistance, and the MCU chip 310 can obtain the instantaneous current of the first path by collecting the voltages at the two ends of the shunt 250.
Optionally, the flyback sub-circuit further includes a second inductor 261, a third inductor 262, a fourth inductor 263 and a first capacitor 270, the second inductor 261 and the third inductor 262 are disposed in series in the first path, and the fourth inductor 263 is disposed in series in the second path;
the second inductor 261, the third inductor 262 and the fourth inductor 263 are three-phase common mode inductors;
the first capacitor 270 is disposed between the negative terminal of the battery 400 and the second interface terminal 102, and is connected in parallel with the first path.
In the embodiment of the present invention, in order to suppress the common mode noise in the flyback sub-circuit, referring to fig. 1, a three-phase common mode inductor may be disposed in the flyback sub-circuit, and the first capacitor 270 and the second inductor 261 constitute a noise suppression loop to suppress the noise generated by the transformer 210, thereby reducing the interference to the battery management system and the external device.
Optionally, the flyback sub-circuit may further include a second diode 281 and a second capacitor 282, the second diode 281 being disposed in series on the second path and between the first diode 240 and the first interface terminal 101, and the second capacitor 282 being disposed between the first diode 240 and the second diode 281 and in parallel with the second path.
In the embodiment of the present invention, the second capacitor 282 can be regarded as an output filter capacitor, which plays a role of voltage stabilization and filtering, and the second diode 281 can avoid the charger from directly charging the second capacitor 282 through the first interface end 101 and the second interface end 102, thereby causing the filter function of the second capacitor 282 to fail.
Optionally, in order to reduce the ripple current of the charging, the flyback sub-circuit may further include a third capacitor 290, where the third capacitor 290 is disposed between the first inductor 230 and the primary winding 211 and is connected in parallel with the first path.
Further, in order to increase the total capacitance of the third capacitor 290, thereby increasing the filtering efficiency, the number of the third capacitors 290 may be 3.
Alternatively, the first electronic switch 220 may be a Metal-Oxide-Semiconductor (MOS) transistor. Of course, in other alternative embodiments, the first electronic switch 220 may also be an electronic switching device such as an Insulated Gate Bipolar Transistor (IGBT), and may be specifically set according to actual needs.
Referring to fig. 4, the embodiment of the present invention further provides a battery management system, which includes a second electronic switch 500, a third electronic switch 600 and the battery charging circuit as described in any of the above embodiments, a battery 400 in the battery charging circuit is connected in series with the second electronic switch 500 and the third electronic switch 600, the second electronic switch 500 is disposed on the low side of the battery management system, and the third electronic switch 600 is disposed on the high side of the battery management system.
In the embodiment of the present invention, the second electronic switch 500 and the third electronic switch 600 can be separately disposed, and the second electronic switch 500 is located at a lower side and can be controlled by the control sub-circuit in the battery charging circuit. And the third electronic switch 600 is located at a high side and can be controlled by an Analog Front End (AFE) in the battery management system, thereby facilitating the arrangement of the battery charging circuit.
During charging, the third electronic switch 600 is turned on, the second electronic switch 500 is turned off, and a charging current flows through the battery 400 and the first path to charge the battery 400. During discharging, the third electronic switch 600 and the second electronic switch 500 are both turned on, and the battery 400 is discharged to the outside through the first interface terminal 101 and the second interface terminal 102.
The above embodiments are only specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention, and all should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A battery charging circuit is applied to a battery management system and is characterized by comprising a first interface terminal, a second interface terminal, a flyback sub-circuit, a control sub-circuit and a battery, wherein the flyback sub-circuit comprises a transformer, a first electronic switch, a first inductor and a first diode,
the transformer comprises a primary winding and a secondary winding, the first inductor and the first electronic switch are arranged on a first path where the primary winding is located in series, one end of the first path is electrically connected with the negative electrode of the battery, and the other end of the first path is electrically connected with the second interface end; a first diode is arranged on a second passage where the secondary winding is arranged in series, one end of the second passage is electrically connected with the first interface end, and the other end of the second passage is electrically connected with the cathode of the battery;
the control sub-circuit is electrically connected with the first electronic switch;
the control sub-circuit is used for controlling the on-off of the first electronic switch according to the current of the first access.
2. The battery charging circuit of claim 1, wherein the control sub-circuit comprises a Micro Control Unit (MCU) chip, the MCU chip being electrically connected to the first electronic switch;
the MCU chip drives the first electronic switch to be conducted through a driving signal and controls the on-off frequency of the first electronic switch by controlling the duty ratio of the driving signal.
3. The battery charging circuit of claim 2, wherein the control sub-circuit further comprises an Integrated Circuit (IC) chip, the MCU chip being electrically connected to the first electronic switch through the IC chip;
the MCU chip indicates the IC chip to generate a driving current through a driving signal so as to drive the first electronic switch to be conducted; the MCU chip controls the on-off frequency of the first electronic switch by controlling the duty ratio of the driving signal.
4. The battery charging circuit according to claim 2, wherein the flyback sub-circuit further comprises a shunt, the shunt is serially disposed on the first path and electrically connected to the MCU chip, and is configured to collect the current of the first path, convert the current signal of the first path into a voltage signal, and transmit the voltage signal to the MCU chip.
5. The battery charging circuit of claim 1, wherein the flyback sub-circuit further comprises a second inductor, a third inductor, a fourth inductor, and a first capacitor, the second and third inductors disposed in series in the first path, the fourth inductor disposed in series in the second path;
the second inductor, the third inductor and the fourth inductor are three-phase common mode inductors;
the first capacitor is arranged between the negative electrode of the battery and the second interface end and is connected with the first passage in parallel.
6. The battery charging circuit of claim 1, wherein the flyback sub-circuit further comprises a second diode disposed in series on the second path between the first diode and the first interface terminal and a second capacitor disposed between the first diode and the second diode and in parallel with the second path.
7. The battery charging circuit of claim 5, wherein the flyback sub-circuit further comprises a third capacitor disposed between the first inductor and the primary winding in parallel with the first path.
8. The battery charging circuit of claim 7, wherein the number of the third capacitors is 3.
9. The battery charging circuit of claim 1, wherein the first electronic switch is a field effect MOS transistor.
10. A battery management system comprising a second electronic switch, a third electronic switch and a battery charging circuit as claimed in any one of claims 1 to 9, wherein the battery in the battery charging circuit is arranged in series with the second electronic switch and the third electronic switch, and the second electronic switch is arranged on the low side of the battery management system and the third electronic switch is arranged on the high side of the battery management system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023102750.XU CN214045126U (en) | 2020-12-21 | 2020-12-21 | Battery charging circuit and battery management system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023102750.XU CN214045126U (en) | 2020-12-21 | 2020-12-21 | Battery charging circuit and battery management system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214045126U true CN214045126U (en) | 2021-08-24 |
Family
ID=77339779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023102750.XU Active CN214045126U (en) | 2020-12-21 | 2020-12-21 | Battery charging circuit and battery management system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214045126U (en) |
-
2020
- 2020-12-21 CN CN202023102750.XU patent/CN214045126U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10498225B2 (en) | Dual-rectification full bridge interleaved single stage PFC converter circuit and control methods thereof | |
| US10833594B2 (en) | System and method of controlling a power converter having an LC tank coupled between a switching network and a transformer winding | |
| US8593836B2 (en) | Power converter using soft switching method for zero current switching at turn on and zero voltage switching at turn off | |
| US8207717B2 (en) | Buck-boost DC-DC converter with auxiliary inductors for zero current switching | |
| US8422179B2 (en) | Inrush current control | |
| EP2276158A1 (en) | Switching power supply device | |
| US20060176719A1 (en) | Soft switching DC-DC converter | |
| CN108736874B (en) | Intelligent remote control MOSFET power electronic alternating current switching device | |
| CN102130613B (en) | Power converter having a switch coupled between windings | |
| WO2015096613A1 (en) | Online interactive uninterruptible power supply and control method therefor | |
| US20230253885A1 (en) | Soft-switching pulse-width modulated dc-dc power converter | |
| CN210016405U (en) | Micro-grid double-active full-bridge bidirectional DC-DC converter | |
| CN107834832A (en) | A kind of voltage peak absorbing circuit | |
| CN107733319B (en) | AC motor speed regulation circuit and air conditioner | |
| CN214045126U (en) | Battery charging circuit and battery management system | |
| EP2892135B1 (en) | Power Supply and energy efficient Gate Driver | |
| EP1756932B1 (en) | Method and circuit arrangement for optimising maximum current limitation in the primary switch of a switched-mode power supply, and a power supply | |
| CN204290428U (en) | A kind of integrate motor drives and battery charging function module | |
| US7688044B2 (en) | Device for transforming and stabilizing a primary AC voltage for supplying an electric load | |
| CN215934484U (en) | Battery charging circuit and battery management system | |
| CN115085397A (en) | Small coil wireless charging system | |
| EP4266532A1 (en) | Bidirectional dc/dc converter and control method therefor, and vehicle | |
| CN112636424A (en) | Battery charging circuit and battery management system | |
| CN210608949U (en) | Voltage transformation rectifying circuit and charger | |
| CN116404883B (en) | Power supply circuit and power supply equipment thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |