Power supply circuit, circuit board, battery management system and electric device

Abstract

The utility model discloses a power supply circuit, a circuit board, a battery management system and an electric device. The power supply circuit comprises a driver, a transformer, a rectifier and a filtering module; the driver comprises a driving pin and a power supply input pin, the transformer comprises a primary winding and a secondary winding, the driving pin and the power supply input pin are connected with different taps of the primary winding, the secondary winding is connected with the input end of the rectifier, and the output end of the rectifier is connected with the power supply output end of the power supply circuit; wherein the filtering module comprises at least one of a driving filtering module, an input filtering module, an output filtering module and a primary and secondary filtering module; the driving filtering module is connected with a driving pin, the input filtering module is connected with a power supply input pin and a primary winding, the output filtering module is connected with a power supply output end, and the primary and secondary filtering modules are connected with a connecting end connected with a driver and a grounding end connected with a secondary winding. According to the embodiment of the invention, the EMC performance of the power supply circuit can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of power supply circuits, and in particular to a power supply circuit, a circuit board, a battery management system and an electrical device. Background Art

[0002] As a high-voltage and low-voltage hybrid controller system, the Battery Management System (BMS) generally uses isolated power supply circuits in product design to power high-voltage side functional modules (such as high-voltage sampling and insulation sampling).

[0003] However, the driver chip with fixed parameters used in the isolated power supply circuit cannot be adjusted by the driving parameters to improve the electromagnetic compatibility (EMC). Therefore, how to improve the EMC performance of the power supply circuit is an important problem faced by those skilled in the art. Utility Model Content

[0004] The present application provides a power supply circuit, a circuit board, a battery management system and an electrical device, which are helpful to improve the EMC performance of the power supply circuit.

[0005] In a first aspect, the present application provides a power supply circuit, including a driver, a transformer, a rectifier and a filter module; the driver includes a drive pin and a power input pin, the transformer includes a primary winding and a secondary winding, the drive pin and the power input pin are connected to different taps of the primary winding, the secondary winding is connected to the input end of the rectifier, and the output end of the rectifier is connected to the power output end of the power supply circuit; wherein the filter module includes at least one of a drive filter module, an input filter module, an output filter module, and a primary-secondary filter module; the drive filter module is connected to the drive pin, the input filter module is connected to the power input pin and the primary winding, the output filter module is connected to the power output end, and the primary-secondary filter module is connected to the receiving end connected to the driver and the ground end connected to the secondary winding.

[0006] In an embodiment of the present application, without changing the parameters of the driver itself, a filtering module is set, and the filtering module includes at least one of a driving filtering module, an input filtering module, an output filtering module, and a primary-secondary filtering module, thereby helping to improve the EMC performance of the power supply circuit.

[0007] In a possible implementation manner of the first aspect, the driving pin includes a first driving pin and a second driving pin, and the first driving pin, the second driving pin and the power input pin are connected to different taps of the primary winding;

[0008] The driving filter module includes a first driving filter module and a second driving filter module. The first driving filter module is connected to the first driving pin, and the second driving filter module is connected to the second driving pin.

[0009] In the embodiment of the present application, a driving filter module is provided corresponding to different driving pins, which can filter the signals of different driving pins, thereby helping to further improve the EMC performance of the power supply circuit.

[0010] In a possible implementation of the first aspect, the input filtering module includes a first input filtering module, a second input filtering module and a third input filtering module;

[0011] The first input filter module is connected to the power input terminal and the power input pin;

[0012] The second input filter module is connected to the power input pin;

[0013] The third input filter module is connected to the tap of the primary winding.

[0014] In the embodiment of the present application, input filter modules are provided corresponding to different input terminals, which can filter the signals of different input terminals, thereby helping to further improve the EMC performance of the power supply circuit.

[0015] In a possible implementation manner of the first aspect, the driving filter module, the second input filter module, the third input filter module, and the primary-secondary filter module include the same filter model;

[0016] And / or, the first input filtering module and the output filtering module include the same filtering model.

[0017] The first input filter module and the output filter module need to pass the power signal, and the same filter model can be used for both. The driving filter module, the second input filter module, the third input filter module, and the primary and secondary filter modules do not need to pass the power signal, and these filter modules can use the same filter model.

[0018] In a possible implementation of the first aspect, the driving filter module, the second input filter module, the third input filter module, and the primary and secondary filter modules include a C-type filter module;

[0019] And / or, the first input filter module and the output filter module include π-type filter models.

[0020] In a possible implementation of the first aspect, the input filter module includes a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor and a first inductor, the first inductor is connected between the power input terminal and the power input pin, the first capacitor is connected between the power input terminal and the first ground terminal, the second capacitor and the third capacitor are connected in parallel between the power input pin and the first ground terminal, the fourth capacitor is connected between the power input pin and the first ground terminal, the fifth capacitor is connected between the third tap of the primary winding and the first ground terminal, and the power input pin is connected to the third tap;

[0021] And / or, the driving filter module includes a sixth capacitor and a seventh capacitor, the sixth capacitor is connected between the first driving pin of the driver and the first ground terminal, the seventh capacitor is connected between the second driving pin of the driver and the first ground terminal, the first driving pin is connected to the first tap of the primary winding, and the second driving pin is connected to the second tap of the primary winding;

[0022] And / or, the original secondary filter module includes an eighth capacitor, the eighth capacitor is connected between the first ground terminal and the second ground terminal, the fourth tap and the fifth tap of the secondary winding are connected to the rectifier, and the sixth tap of the secondary winding is connected to the second ground terminal;

[0023] And / or, the output filter module includes a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor and a second inductor, the second inductor is connected between the output end of the rectifier and the power output end of the power supply circuit, the ninth capacitor and the tenth capacitor are connected in parallel between the output end of the rectifier and the second ground terminal, and the eleventh capacitor and the twelfth capacitor are connected in parallel between the power output end and the second ground terminal.

[0024] In the second aspect, based on the same inventive concept, an embodiment of the present application further provides a circuit board, characterized in that it includes a power supply circuit as described in any embodiment of the first aspect.

[0025] In a possible implementation of the second aspect, the driving filter module includes a first driving filter module and a second driving filter module, the first driving filter module is connected to and adjacent to a first driving pin of the driver, and the second driving filter module is connected to and adjacent to a second driving pin of the driver.

[0026] In a possible implementation of the second aspect, the input filter module includes a first input filter module, a second input filter module and a third input filter module; the first input filter module is connected to the power input terminal and the power input pin, and the first input filter module is adjacent to the power input terminal; the second input filter module is connected to and adjacent to the power input pin; the third input filter module is connected to and adjacent to the tap of the primary winding.

[0027] In a possible implementation of the second aspect, the output filter module is located between the rectifier and the power output end.

[0028] In a possible implementation manner of the second aspect, the primary-secondary filter module is adjacent to the transformer.

[0029] In the embodiment of the present application, by arranging the filter module corresponding to the driving pin close to the driving pin, it is helpful to ensure the filtering effect of the filter module.

[0030] In a possible implementation manner of the second aspect, the input filter module includes a second input filter module and a third input filter module, the second input filter module is connected to the power input pin, and the third input filter module is connected to the primary winding;

[0031] The driver, the transformer, the driving filter module, the second input filter module and the third input filter module are located on the same side of the circuit board.

[0032] The driving filter module and the second input filter module filter the signals of the driving pin and the power input pin of the driver respectively, and the third input filter module filters the signals of the tap of the transformer, and the driving pin, the power input pin and the tap of the transformer of the driver are connected. If the driving filter module, the second input filter module and the driver are not on the same side, the third input filter module and the transformer are not on the same side, and the driver and the transformer are not on the same side, connecting vias are required to achieve the connection between them, so that the impedance is relatively large. In the embodiment of the present application, the driver, the transformer, the driving filter module, the second input filter module and the third input filter module are arranged on the same side, which can avoid the impedance of the connecting vias affecting the filtering effect, and the filtering loop has low resistance to the noise source, which helps to improve the filtering effect.

[0033] In a third aspect, based on the same inventive concept, an embodiment of the present application further provides a battery management system, comprising a power supply circuit as described in any embodiment of the first aspect.

[0034] In a fourth aspect, based on the same inventive concept, an embodiment of the present application further provides an electrical device, comprising a battery management system as described in any one of the embodiments of the third aspect.

[0035] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0037] Figure 1This is a schematic diagram of the structure of a power supply circuit according to an embodiment of the present application;

[0038] Figure 2 This is a schematic diagram of the structure of a power supply circuit according to another embodiment of the present application;

[0039] Figure 3 This is a structural schematic diagram of a power supply circuit according to another embodiment of the present application;

[0040] Figure 4 This is a structural schematic diagram of a power supply circuit according to another embodiment of the present application;

[0041] Figure 5 This is a structural schematic diagram of a power supply circuit according to another embodiment of the present application;

[0042] Figure 6 A schematic diagram of the layout structure of a circuit board according to an embodiment of the present application.

[0043] Description of reference numerals:

[0044] 10. Driver;

[0045] 20. Transformer;

[0046] 30. Rectifier;

[0047] 40. Filter module;

[0048] 41. driving filter module; 411. first driving filter module; 412. second driving filter module;

[0049] 42. Input filter module; 421. First input filter module; 422. Second input filter module; 423. Third input filter module;

[0050] 43. Output filter module;

[0051] 44. Original secondary side filter module. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0053] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0054] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0055] In BMS product design, isolated power supplies are commonly used as power supplies for high-voltage side functional modules (high-voltage sampling and insulation sampling). These two modules have low power consumption requirements, so low-cost push-pull isolated power supply circuits are widely used in products in the BMS industry.

[0056] For example, the SN6501 driver chip can be used in the isolated power supply circuit. As a driver chip with an internal integrated drive switch (such as MOSFET), the key drive control signal parameters of SN6501 have been fixed by the chip parameters. In terms of EMC design, it is impossible to adjust the MOSFET drive parameters to improve the EMC performance and solve the problem of EMC exceeding the standard in the application circuit.

[0057] In order to solve the above technical problems, the embodiments of the present application provide a power supply circuit, a circuit board, a battery management system and an electrical device. The power supply circuit, circuit board, battery management system and electrical device provided in the embodiments of the present application will be described in detail below in conjunction with the accompanying drawings.

[0058] The following first introduces the power supply circuit provided by the application embodiment.

[0059] like Figure 1 As shown, the power supply circuit provided in the embodiment of the present application may include a driver 10 , a transformer 20 , a rectifier 30 and a filter module 40 .

[0060] The driver 10 includes driving pins D1 / D2 and a power input pin VCC.

[0061] The transformer 20 includes a primary winding and a secondary winding. The primary winding may include multiple taps, and the secondary winding may also include multiple taps. The drive pins D1 / D2 and the power input pin VCC are connected to different taps of the primary winding, the secondary winding is connected to the input end of the rectifier 30, and the output end of the rectifier 30 is connected to the power output end V_out of the power circuit.

[0062] The filter module 40 may include at least one of a driving filter module 41 , an input filter module 42 , an output filter module 43 , and a primary-secondary filter module 44 .

[0063] The driving filter module 41 is connected to the driving pin D, the input filter module 42 is connected to the power input pin VCC and the primary winding, the output filter module 43 is connected to the power output terminal V_out, and the primary-secondary filter module 44 is connected to the receiving terminal GND1 connected to the driver 10 and the ground terminal GND2 connected to the secondary winding.

[0064] The driving filter module 41 can be used to filter out the pulse voltage during the switching process of the driver 10, so as to smooth the driving signal waveform.

[0065] The input filter module 42 may be used to filter interference of the input signal. The input filter module 42 may also be used to attenuate interference generated by the power supply itself from being transmitted to the input power supply side.

[0066] The output filter module 43 may be used to filter interference of the power output.

[0067] The primary-secondary filter module 44 can be used for power loop noise filtering.

[0068] In an embodiment of the present application, without changing the parameters of the driver 10 itself, by setting a filter module 40, the filter module 40 includes at least one of a drive filter module 41, an input filter module 42, an output filter module 43 and a primary-secondary filter module 44, which can help improve the EMC performance of the power supply circuit.

[0069] It should be noted that Figure 1 Although the driving filter module 41, the input filter module 42, the output filter module 43 and the primary-secondary filter module 44 are shown, the power supply circuit of the embodiment of the present application may include one or more of the driving filter module 41, the input filter module 42, the output filter module 43 and the primary-secondary filter module 44.

[0070] Exemplarily, the driver 10 includes a SN6501 chip.

[0071] In some embodiments, Figure 2As shown, the driving pin D includes a first driving pin D1 and a second driving pin D2, and the first driving pin D1, the second driving pin D2 and the power input pin VCC are connected to different taps of the primary winding. For example, the primary winding includes a first tap 1, a second tap 2 and a third tap 3, and the third tap 3 is a tap between the first tap 1 and the second tap 2. The third tap 3 can be a center tap. The first driving pin D1 is connected to the first tap 1 of the primary winding, the second driving pin D2 is connected to the second tap 2 of the primary winding, and the power input pin VCC is connected to the third tap 3 of the primary winding.

[0072] The driving filter module 41 may include a first driving filter module 411 and a second driving filter module 412 . The first driving filter module 411 is connected to the first driving pin D1 , and the second driving filter module 412 is connected to the second driving pin D2 .

[0073] The first driving filter module 411 may be used to filter out the pulse voltage during the switch switching process corresponding to the first driving pin D1 , thereby being used to smooth the driving signal waveform of the first driving pin D1 .

[0074] The second driving filter module 412 may be used to filter out the pulse voltage during the switch switching process corresponding to the second driving pin D2 , thereby being used to smooth the driving signal waveform of the second driving pin D2 .

[0075] In the embodiment of the present application, a driving filter module is provided corresponding to different driving pins, which can filter the signals of different driving pins, thereby helping to further improve the EMC performance of the power supply circuit.

[0076] In some embodiments, Figure 3 As shown, the input filter module 42 may include a first input filter module 421 , a second input filter module 422 and a third input filter module 423 .

[0077] The first input filter module 421 is connected to the power input terminal Vin and the power input pin Vcc of the driver 10 .

[0078] The second input filter module 422 is connected to the power input pin Vcc of the driver 10 .

[0079] The third input filter module 423 is connected to the tap of the primary winding. For example, the power input pin Vcc of the driver 10 is connected to the third tap 3 of the primary winding, and the third input filter module 423 is connected to the third tap 3 of the primary winding.

[0080] The first input filter module 421 can be used to filter the interference of the input signal of the power input terminal Vin. The first input filter module 421 can also be used to attenuate the interference generated by the power supply itself and transmitted to the power input pin Vcc.

[0081] The second input filter module 422 can be used for decoupling the power input pin Vcc. In other words, the second input filter module 422 can be used for eliminating the parasitic coupling of the power input pin Vcc in the circuit.

[0082] The third input filter module 423 can be used for decoupling the third tap 3 of the primary winding. In other words, the third input filter module 423 can be used for eliminating the parasitic coupling of the third tap 3 of the primary winding in the circuit.

[0083] In the embodiment of the present application, input filter modules are provided corresponding to different input terminals, which can filter the signals of different input terminals, thereby helping to further improve the EMC performance of the power supply circuit.

[0084] In some embodiments, the driving filter module 41, the second input filter module 422, the third input filter module 423 and the primary-secondary filter module 44 may include the same filter model. And / or, the first input filter module 421 and the output filter module 43 may include the same filter model.

[0085] Exemplarily, the filter model may include a C-type filter model, a π-type filter model, an LC-type filter model, an LR-type filter model, etc. Among them, the π-type filter model may also be called a PI-type filter model.

[0086] The C-type filter model is that the filter circuit includes a capacitor. The π-type filter model is that the filter circuit includes an inductor, and capacitors are connected to both sides of the inductor. The LC-type filter model is that the filter circuit includes an inductor, and a capacitor is connected to one side of the inductor. The LR-type filter model is that the filter circuit includes an inductor, and a resistor is connected to one side of the inductor.

[0087] The first input filter module 421 and the output filter module 43 need to pass the power signal, and the same filter model can be used for both. The driving filter module 41, the second input filter module 422, the third input filter module 423 and the primary and secondary filter module 44 do not need to pass the power signal, and these filter modules can use the same filter model.

[0088] As an example, the dynamic filter module 41, the second input filter module 422, the third input filter module 423 and the primary-secondary filter module 44 may include a C-type filter model; and / or, the first input filter module 421 and the output filter module 43 may include a π-type filter model.

[0089] Of course, the filter module can also be set to other filter models according to needs. The filter models in the power supply circuit of the present application include but are not limited to C-type filter models and π-type filter models.

[0090] In some embodiments, Figure 4As shown, the input filter module 42 may include a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5 and a first inductor L1. The first inductor L1 is connected between the power input terminal Vin and the power input pin VCC, the first capacitor C1 is connected between the power input terminal Vin and the first ground terminal GND1, and the second capacitor C2 and the third capacitor C3 are connected in parallel between the power input pin VCC and the first ground terminal GND1.

[0091] The first capacitor C1, the second capacitor C2, the third capacitor C3 and the first inductor L1 form a π-type filter model.

[0092] In terms of layout, the first capacitor C1, the second capacitor C2, the third capacitor C3 and the first inductor L1 can be arranged on the power input loop of the driver 10, and the first capacitor C1, the second capacitor C2, the third capacitor C3 and the first inductor L1 can be close to the power input terminal Vin and the power input pin VCC.

[0093] The fourth capacitor C4 is connected between the power input pin VCC and the first ground terminal GND1, the fifth capacitor C5 is connected between the third tap 3 of the primary winding and the first ground terminal GND1, and the power input pin VCC is connected to the third tap 3 of the primary winding.

[0094] The fourth capacitor C4 is used as a decoupling capacitor of the power input pin VCC. In terms of layout, the fourth capacitor C4 can be placed next to the power input pin VCC.

[0095] The fifth capacitor C5 serves as a decoupling capacitor of the third tap 3 of the primary winding. In terms of layout, the fifth capacitor C5 can be placed next to the third tap 3 of the primary winding.

[0096] In some embodiments, Figure 4 As shown, the driving filter module 41 includes a sixth capacitor C6 and a seventh capacitor C7, the sixth capacitor C6 is connected between the first driving pin D1 of the driver 10 and the first ground terminal GND1, the seventh capacitor C7 is connected between the second driving pin D2 of the driver 10 and the first ground terminal GND1, the first driving pin D1 is connected to the first tap 1 of the primary winding, and the second driving pin D2 is connected to the second tap 2 of the primary winding.

[0097] The sixth capacitor C6 is used as a filter capacitor of the first driving pin D1. In terms of layout, the sixth capacitor C6 can be placed next to the first driving pin D1.

[0098] The seventh capacitor C7 is used as a filter capacitor of the second driving pin D2. In terms of layout, the seventh capacitor C7 can be placed next to the second driving pin D2.

[0099] In some embodiments, Figure 4 As shown, the original secondary filter module 44 includes an eighth capacitor C8, the eighth capacitor C8 is connected between the first ground terminal GND1 and the second ground terminal GND2, the fourth tap 4 and the fifth tap 5 of the secondary winding are connected to the rectifier 30, and the sixth tap 6 of the secondary winding is connected to the second ground terminal GND2.

[0100] In terms of layout, the eighth capacitor C8 can be placed across both sides of the transformer 20 to ensure that the loop from the power input pin VCC to the first ground terminal GND1 to the second ground terminal GND2 to the power output terminal V_out is the shortest.

[0101] Exemplarily, the rectifier 30 may include a first diode D11 and a second diode D12, the anode of the first diode D11 is connected to the fourth tap 4 of the secondary winding, the anode of the second diode D12 is connected to the fifth tap 5 of the secondary winding, and the cathode of the first diode D11 and the cathode of the second diode D12 are interconnected as the output end of the rectifier 30.

[0102] In some embodiments, Figure 4 As shown, the output filter module 43 includes a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12 and a second inductor L2, the second inductor L2 is connected between the output end of the rectifier 30 and the power output end V_out of the power supply circuit, the ninth capacitor C9 and the tenth capacitor C10 are connected in parallel between the output end of the rectifier 30 and the second ground end GND2, and the eleventh capacitor C11 and the twelfth capacitor C12 are connected in parallel between the power output end V_out and the second ground end GND2.

[0103] The ninth capacitor C9, the tenth capacitor C10, the eleventh capacitor C11, the twelfth capacitor C12 and the second inductor L2 form a π-type filtering model.

[0104] In terms of layout, the ninth capacitor C9 , the tenth capacitor C10 , the eleventh capacitor C11 , the twelfth capacitor C12 and the second inductor L2 are arranged on the output loop of the rectifier 30 .

[0105] As an example, the parameters of each device in the power circuit can be as follows Figure 5 It should be noted that the parameters of each device in the embodiment of the present application may include but are not limited to Figure 5 Parameters shown.

[0106] The inventors also tested the EMC performance of the BMS equipped with the power supply circuit of the embodiment of the present application, and found that it passed the CISPR25 standard Class 5 level using the EMC conducted emission (current method) test.

[0107] Based on the same inventive concept, the embodiment of the present application further provides a circuit board. The circuit board includes the power supply circuit in any of the above embodiments. It can be understood that the circuit board has the beneficial effects of the power supply circuit provided in the embodiment of the present application, and the specific description of the power supply circuit in the above embodiments can be referred to, and this embodiment will not be repeated here.

[0108] In some embodiments, Figure 6 As shown, the driving filter module 41 includes a first driving filter module 411 and a second driving filter module 412. The first driving filter module 411 is connected to the first driving pin D1 of the driver 10, and the first driving filter module 411 is adjacent to the first driving pin D1 of the driver 10. The second driving filter module 412 is connected to the second driving pin D2 of the driver 10, and the second driving filter module 412 is adjacent to the second driving pin D2 of the driver 10.

[0109] In the embodiment of the present application, by arranging the filter module corresponding to the driving pin close to the driving pin, it is helpful to ensure the filtering effect of the filter module.

[0110] The first driving filter module 411 includes a sixth capacitor C6, and the second driving filter module 412 includes a seventh capacitor C7.

[0111] In some embodiments, Figure 6 As shown, the input filter module 42 includes a first input filter module 421, a second input filter module 422 and a third input filter module 423; the first input filter module 421 is connected to the power input terminal Vin and the power input pin VCC, and the first input filter module 421 is adjacent to the power input terminal Vin. The first input filter module 421 can also be close to the power input pin VCC. Exemplarily, the first input filter module 421 is on one side of the driver 10. The second input filter module 422 is connected to the power input pin VCC, and the second input filter module 422 is adjacent to the power input pin VCC. In other words, the second input filter module 422 is arranged next to the power input pin VCC. The third input filter module 423 is connected to the third tap 3 of the primary winding, and the third input filter module 423 is adjacent to the third tap 3 of the primary winding. In other words, the third input filter module 423 is arranged next to the third tap 3 of the primary winding.

[0112] The first input filter module 421 includes a first capacitor C1, a second capacitor C2, a third capacitor C3 and a first inductor L1. The second input filter module 422 includes a fourth capacitor C4. The third input filter module 423 includes a fifth capacitor C5.

[0113] In some embodiments, Figure 6As shown, the output filter module 43 is located between the rectifier 30 and the power output terminal V_out. The output filter module 43 is on the output loop of the rectifier 30. The output filter module 43 is arranged close to the rectifier 30 and the power output terminal V_out.

[0114] The output filter module 43 includes a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12 and a second inductor L2.

[0115] In some embodiments, Figure 6 As shown, the primary-secondary filter module 44 is adjacent to the transformer 20 .

[0116] The primary-secondary filter module 44 includes an eighth capacitor C8, which can be placed across the transformer 20 to ensure that the loop from the power input pin VCC to the first ground terminal GND1 to the second ground terminal GND2 to the power output terminal V_out is the shortest.

[0117] In the above embodiments, each filter module is disposed close to the pin or device to which it is connected, which can help improve the filtering effect.

[0118] It should be noted that in the above embodiment, at least one of the multiple filter modules can be selected to be arranged near the pin or device to which it is connected, or each of the multiple filter modules can be selected to be arranged near the pin or device to which it is connected.

[0119] It should be noted that Figure 6 In the figure, the unmarked thick solid line (gray line) indicates the connection line, the thick solid line (gray line) marked as GND1 indicates the first ground terminal GND1 or is connected to the first ground terminal GND1, the thick solid line (gray line) marked as GND2 indicates the second ground terminal GND2 or is connected to the second ground terminal GND2, the thick solid line (gray line) marked as Vin indicates the power input terminal Vin or is connected to the power input terminal Vin, and the thick solid line (gray line) marked as V_out indicates the power output terminal V_out or is connected to the power output terminal V_out. In addition, the hollow circle indicates the connection to the first ground terminal GND1, the solid black dot indicates the connection to the second ground terminal GND2, and the hollow square indicates the connection to the connection line.

[0120] In some embodiments, the input filter module 42 includes a second input filter module 422 and a third input filter module 423, the second input filter module 422 is connected to the power input pin VCC, and the third input filter module 423 is connected to the third tap 3 of the primary winding.

[0121] The driver 10 , the transformer 20 , the driving filter module 41 , the second input filter module 422 and the third input filter module 423 are located on the same surface of the circuit board.

[0122] For example, in the thickness direction of the circuit board, the circuit board may include relative upper and lower surfaces, and the driver 10, transformer 20, driving filter module 41, second input filter module 422 and third input filter module 423 are located on the upper surface of the circuit board, or the driver 10, transformer 20, driving filter module 41, second input filter module 422 and third input filter module 423 are located on the lower surface of the circuit board.

[0123] The driving filter module 41 and the second input filter module 422 filter the signals of the driving pin and the power input pin of the driver 10 respectively, and the third input filter module 423 filters the signals of the tap of the transformer 20, and the driving pin, the power input pin and the tap of the transformer 20 of the driver 10 are connected. If the driving filter module 41, the second input filter module 422 and the driver 10 are not on the same surface, the third input filter module 423 and the transformer 20 are not on the same surface, and the driver 10 and the transformer 20 are not on the same surface, it is necessary to connect vias to achieve the connection between them, so that the impedance is relatively large. In the embodiment of the present application, the driver 10, the transformer 20, the driving filter module 41, the second input filter module 422 and the third input filter module 423 are arranged on the same surface, which can avoid the impedance of the connecting vias affecting the filtering effect, and the filtering loop has low resistance to the noise source, which helps to improve the filtering effect.

[0124] Other modules may be arranged on any one of the upper surface and the lower surface of the circuit board, and this application does not limit this.

[0125] For example, in the thickness direction of the circuit board, the circuit board may include a plurality of film layers stacked together, wherein the first ground terminal GND1 may be located in one of the film layers, the second ground terminal GND2 may be located in another film layer, and some of the film layers may also be used to set connection traces, which are used to connect devices in the power supply circuit. Connection vias may also be set on the film layers, which are used to connect the device to the ground terminal, or the connection vias are used to connect the connection traces to the device.

[0126] Based on the same inventive concept, the embodiment of the present application also provides a battery management system, including the power supply circuit in any of the above embodiments. It can be understood that the battery management system has the beneficial effects of the power supply circuit provided in the embodiment of the present application, and the specific description of the power supply circuit in the above embodiments can be referred to, and this embodiment will not be repeated here.

[0127] Based on the same inventive concept, the present application also provides an electric device. The electric device includes a battery management system, and the battery management system includes the power supply circuit in any of the above embodiments. It can be understood that the electric device has the beneficial effects of the power supply circuit provided in the embodiments of the present application, and the specific description of the power supply circuit in the above embodiments can be referred to, and this embodiment will not be repeated here.

[0128] It should be noted that in the embodiments shown in the above figures, the capacitor is expressed as a single capacitor. In other embodiments, the capacitor may also be an integration of series, parallel or hybrid capacitors. The specific parameters of each device may be set according to actual needs, and this application does not limit this.

[0129] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0130] Those skilled in the art will appreciate that the embodiments described herein are intended to help readers understand the principles of the present application, and should be understood that the protection scope of the present application is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific variations and combinations that do not deviate from the essence of the present application based on the technical revelations disclosed in the present application, and these variations and combinations are still within the protection scope of the present application.

[0131] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A power supply circuit, characterized in that: Includes driver, transformer, rectifier and filter modules; The driver includes a driving pin and a power input pin, the transformer includes a primary winding and a secondary winding, the driving pin and the power input pin are connected to different taps of the primary winding, the secondary winding is connected to the input end of the rectifier, and the output end of the rectifier is connected to the power output end of the power circuit; Wherein, the filtering module includes at least one of a driving filtering module, an input filtering module, an output filtering module, and a primary-secondary filtering module; The driving filter module is connected to the driving pin, the input filter module is connected to the power input pin and the primary winding, the output filter module is connected to the power output end, and the primary-secondary filter module is connected to the receiving end connected to the driver and the grounding end connected to the secondary winding.

2. The power supply circuit according to claim 1, characterized in that: The driving pins include a first driving pin and a second driving pin, and the first driving pin, the second driving pin and the power input pin are connected to different taps of the primary winding; The driving filter module includes a first driving filter module and a second driving filter module. The first driving filter module is connected to the first driving pin, and the second driving filter module is connected to the second driving pin.

3. The power supply circuit according to claim 1 or 2, characterized in that: The input filter module includes a first input filter module, a second input filter module and a third input filter module; The first input filter module is connected to the power input terminal and the power input pin; The second input filter module is connected to the power input pin; The third input filter module is connected to the tap of the primary winding.

4. The power supply circuit according to claim 3, characterized in that: The driving filter module, the second input filter module, the third input filter module and the primary-secondary filter module include the same filter model; And / or, the first input filtering module and the output filtering module include the same filtering model.

5. The power supply circuit according to claim 4, characterized in that: The driving filter module, the second input filter module, the third input filter module and the primary and secondary filter modules include a C-type filter module; And / or, the first input filtering module and the output filtering module include a π-type filtering model.

6. The power supply circuit according to claim 1, characterized in that: The input filter module includes a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor and a first inductor, the first inductor is connected between the power input terminal and the power input pin, the first capacitor is connected between the power input terminal and the first ground terminal, the second capacitor and the third capacitor are connected in parallel between the power input pin and the first ground terminal, the fourth capacitor is connected between the power input pin and the first ground terminal, the fifth capacitor is connected between the third tap of the primary winding and the first ground terminal, and the power input pin is connected to the third tap; And / or, the driving filter module includes a sixth capacitor and a seventh capacitor, the sixth capacitor is connected between the first driving pin of the driver and the first ground terminal, the seventh capacitor is connected between the second driving pin of the driver and the first ground terminal, the first driving pin is connected to the first tap of the primary winding, and the second driving pin is connected to the second tap of the primary winding; And / or, the primary-secondary filtering module includes an eighth capacitor, the eighth capacitor is connected between the first ground terminal and the second ground terminal, the fourth tap and the fifth tap of the secondary winding are connected to the rectifier, and the sixth tap of the secondary winding is connected to the second ground terminal; And / or, the output filter module includes a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor and a second inductor, the second inductor is connected between the output end of the rectifier and the power output end of the power supply circuit, the ninth capacitor and the tenth capacitor are connected in parallel between the output end of the rectifier and the second ground end, and the eleventh capacitor and the twelfth capacitor are connected in parallel between the power output end and the second ground end.

7. A circuit board, characterized in that: The method comprises the power supply circuit as claimed in any one of claims 1 to 6.

8. The circuit board according to claim 7, characterized in that: The driving filter module includes a first driving filter module and a second driving filter module. The first driving filter module is connected to and adjacent to a first driving pin of the driver, and the second driving filter module is connected to and adjacent to a second driving pin of the driver.

9. The circuit board according to claim 7, characterized in that: The input filter module includes a first input filter module, a second input filter module and a third input filter module; the first input filter module is connected to the power input end and the power input pin, and the first input filter module is adjacent to the power input end; the second input filter module is connected to and adjacent to the power input pin; the third input filter module is connected to and adjacent to the tap of the primary winding.

10. The circuit board according to claim 7, characterized in that: The output filter module is located between the rectifier and the power output terminal.

11. The circuit board according to claim 7, characterized in that: The primary-secondary filter module is adjacent to the transformer.

12. The circuit board according to claim 7, characterized in that: The input filter module includes a second input filter module and a third input filter module, the second input filter module is connected to the power input pin, and the third input filter module is connected to the primary winding; The driver, the transformer, the driving filter module, the second input filter module and the third input filter module are located on the same surface of the circuit board.

13. A battery management system, characterized in that: The method comprises the power supply circuit as claimed in any one of claims 1 to 6.

14. An electrical device, characterized in that: Comprising the battery management system as claimed in claim 13.

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