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

Abstract

The present application 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 to different taps of the primary winding; the secondary winding is connected to an input end of the rectifier, and an output end of the rectifier is connected to a power supply output end of the power supply circuit; 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 to the driving pin; the input filtering module is connected to the power supply input pin and the primary winding; the output filtering module is connected to the power supply output end; and the primary and secondary filtering module is connected to a grounding end connected to the driver and a grounding end connected to the secondary winding. The embodiments of the present application can improve the EMC performance of the power supply circuit.

Description

Power supply circuits, circuit boards, battery management systems and power-consuming devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202323398629.X filed on December 13, 2023, entitled “Power supply circuit, circuit board, battery management system and power-consuming device,” and the entire contents of that application are incorporated herein by reference. Technical Field

[0003] 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

[0004] As a hybrid high-voltage and low-voltage 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).

[0005] However, the isolated power supply circuit uses a driver chip with fixed parameters, and it is impossible to adjust the driving parameters to improve the electromagnetic compatibility (EMC). Therefore, how to improve the EMC performance of the power supply circuit is an important issue faced by those skilled in the art.

[0006] Summary of the Invention

[0007] The present application provides a power supply circuit, a circuit board, a battery management system and an electrical device, which help to improve the EMC performance of the power supply circuit.

[0008] In the 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 ground end connected to the driver and the secondary winding.

[0009] In an embodiment of the present application, without changing the parameters of the driver itself, by setting a filtering module, 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.

[0010] In a possible implementation of the first aspect, the drive pin includes a first drive pin and a second drive pin, and the first drive pin, the second drive pin, and the power input pin are connected to different taps of the primary winding;

[0011] 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.

[0012] 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.

[0013] 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;

[0014] The first input filter module is connected to the power input terminal and the power input pin;

[0015] The second input filter module is connected to the power input pin;

[0016] The third input filter module is connected to the tap of the primary winding.

[0017] In the embodiment of the present application, an input filter module is 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.

[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-secondary filter module include the same filter model;

[0019] And / or, the first input filtering module and the output filtering module include the same filtering model.

[0020] The first input filter module and the output filter module require power signals to flow through them, and they can use the same filter model. The driver filter module, the second input filter module, the third input filter module, and the primary and secondary filter modules do not require power signals to flow through them, and these filter modules can use the same filter model.

[0021] 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 side filter modules include C-type filter modules;

[0022] And / or, the first input filtering module and the output filtering module include π-type filtering models.

[0023] 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 a third tap of the primary winding and the first ground terminal, and the power input pin is connected to the third tap;

[0024] 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;

[0025] 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;

[0026] 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.

[0027] In the second aspect, based on the same inventive concept, an embodiment of the present application further provides a circuit board, which includes the power supply circuit as described in any embodiment of the first aspect.

[0028] 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 the first driving pin of the driver, and the second driving filter module is connected to and adjacent to the second driving pin of the driver.

[0029] 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 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; and the third input filter module is connected to and adjacent to the tap of the primary winding.

[0030] In a possible implementation of the second aspect, the output filter module is located between the rectifier and the power output end.

[0031] In a possible implementation of the second aspect, the primary-secondary filter module is adjacent to the transformer.

[0032] 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.

[0033] In a possible implementation 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;

[0034] 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.

[0035] 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 filter loop has low resistance to the noise source, which helps to improve the filtering effect.

[0036] 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.

[0037] In a fourth aspect, based on the same inventive concept, an embodiment of the present application further provides an electrical device, comprising the battery management system described in any one of the embodiments of the third aspect.

[0038] 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

[0039] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0040] FIG1 is a schematic structural diagram of a power supply circuit according to an embodiment of the present application;

[0041] FIG2 is a schematic structural diagram of a power supply circuit according to another embodiment of the present application;

[0042] FIG3 is a schematic structural diagram of a power supply circuit according to another embodiment of the present application;

[0043] FIG4 is a schematic structural diagram of a power supply circuit according to another embodiment of the present application;

[0044] FIG5 is a schematic structural diagram of a power supply circuit according to another embodiment of the present application;

[0045] FIG6 is a schematic diagram of a layout structure of a circuit board according to an embodiment of the present application.

[0046] Description of reference numerals:

[0047] 10. Driver;

[0048] 20. Transformer;

[0049] 30. Rectifier;

[0050] 40. Filter module;

[0051] 41. Driving filter module; 411. First driving filter module; 412. Second driving filter module;

[0052] 42. Input filter module; 421. First input filter module; 422. Second input filter module; 423. Third input filter module;

[0053] 43. Output filter module;

[0054] 44. Original secondary side filter module. DETAILED DESCRIPTION

[0055] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0056] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" 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-secondary relationship.

[0057] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0058] Isolated power supplies are commonly used in BMS product design as the power supply 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.

[0059] For example, the SN6501 driver chip can be used in the isolated power supply circuit. However, as a driver chip with an internal integrated drive switch (such as MOSFET), the key drive control signal parameters of the SN6501 have been fixed by the chip parameters. In terms of EMC design, it is impossible to adjust the MOSFET drive parameters to improve EMC performance and solve the problem of EMC exceeding the standard in the application circuit.

[0060] 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 introduced in detail below in conjunction with the accompanying drawings.

[0061] The following first introduces the power supply circuit provided by the application embodiment.

[0062] As shown in FIG1 , the power supply circuit provided in an embodiment of the present application may include a driver 10 , a transformer 20 , a rectifier 30 and a filter module 40 .

[0063] The driver 10 includes driving pins D1 / D2 and a power input pin VCC.

[0064] 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. Drive pins D1 / D2 and power input pin VCC are connected to different taps of the primary winding. The secondary winding is connected to the input of rectifier 30, and the output of rectifier 30 is connected to the power output terminal V_out of the power circuit.

[0065] 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 .

[0066] 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.

[0067] The driving filter module 41 can be used to filter out the pulse voltage during the switching process of the driver 10, thereby being used to smooth the driving signal waveform.

[0068] The input filter module 42 can be used to filter interference of the input signal and can also be used to attenuate interference generated by the power supply itself from being transmitted to the input power side.

[0069] The output filter module 43 can be used to filter interference of the power output.

[0070] The primary-secondary filter module 44 can be used for power loop noise filtering.

[0071] 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.

[0072] It should be noted that although Figure 1 shows a driving filter module 41, an input filter module 42, an output filter module 43 and a primary-secondary filter module 44, the power supply circuit of an 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.

[0073] Illustratively, the driver 10 includes an SN6501 chip.

[0074] In some embodiments, as shown in FIG2 , the drive pin D includes a first drive pin D1 and a second drive pin D2. The first drive pin D1, the second drive 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. 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 drive pin D1 is connected to the first tap 1 of the primary winding, the second drive 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.

[0075] 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 .

[0076] The first driving filter module 411 may be used to filter out the pulse voltage during the switching process of the switch corresponding to the first driving pin D1 , thereby being used to smooth the driving signal waveform of the first driving pin D1 .

[0077] The second driving filter module 412 may be used to filter out the pulse voltage during the switching process of the switch corresponding to the second driving pin D2 , thereby being used to smooth the driving signal waveform of the second driving pin D2 .

[0078] 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.

[0079] In some embodiments, as shown in FIG. 3 , the input filtering module 42 may include a first input filtering module 421 , a second input filtering module 422 , and a third input filtering module 423 .

[0080] The first input filter module 421 is connected to the power input terminal Vin and the power input pin Vcc of the driver 10 .

[0081] The second input filter module 422 is connected to the power input pin Vcc of the driver 10 .

[0082] 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.

[0083] The first input filter module 421 can be used to filter interference of the input signal of the power input terminal Vin. The first input filter module 421 can also be used to attenuate interference generated by the power supply itself from being transmitted to the power input pin Vcc.

[0084] 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 to eliminate parasitic coupling of the power input pin Vcc in the circuit.

[0085] 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 to eliminate parasitic coupling of the third tap 3 of the primary winding in the circuit.

[0086] In the embodiment of the present application, an input filter module is 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.

[0087] 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.

[0088] For example, the filtering model may include a C-type filtering model, a π-type filtering model, an LC-type filtering model, an LR-type filtering model, etc. Among them, the π-type filtering model may also be called a PI-type filtering model.

[0089] The C-type filter model is a filter circuit that includes a capacitor. The π-type filter model is a filter circuit that includes an inductor, with capacitors connected on both sides of the inductor. The LC-type filter model is a filter circuit that includes an inductor, with a capacitor connected on one side of the inductor. The LR-type filter model is a filter circuit that includes an inductor, with a resistor connected on one side of the inductor.

[0090] The first input filter module 421 and the output filter module 43 require a power signal to flow through them, and the same filter model can be used for both. The driver filter module 41, the second input filter module 422, the third input filter module 423, and the primary-secondary filter module 44 do not require a power signal to flow through them, and these filter modules can use the same filter model.

[0091] As an example, the dynamic filtering module 41, the second input filtering module 422, the third input filtering module 423 and the primary-secondary filtering module 44 may include a C-type filtering model; and / or, the first input filtering module 421 and the output filtering module 43 may include a π-type filtering model.

[0092] 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 this application include but are not limited to C-type filter models and π-type filter models.

[0093] In some embodiments, as shown in FIG4 , 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.

[0094] The first capacitor C1 , the second capacitor C2 , the third capacitor C3 and the first inductor L1 form a π-type filter model.

[0095] In terms of layout, the first capacitor C1, the second capacitor C2, the third capacitor C3 and the first inductor L1 can be set 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.

[0096] 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. The power input pin VCC is connected to the third tap 3 of the primary winding.

[0097] The fourth capacitor C4 serves as a decoupling capacitor for the power input pin VCC. In terms of layout, the fourth capacitor C4 can be placed next to the power input pin VCC.

[0098] The fifth capacitor C5 serves as a decoupling capacitor for 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.

[0099] In some embodiments, as shown in Figure 4, 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.

[0100] The sixth capacitor C6 serves as a filter capacitor for the first drive pin D1 and can be placed next to the first drive pin D1 in terms of layout.

[0101] The seventh capacitor C7 serves as a filter capacitor for the second drive pin D2. In terms of layout, the seventh capacitor C7 can be placed next to the second drive pin D2.

[0102] In some embodiments, as shown in Figure 4, the primary-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.

[0103] 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.

[0104] 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 connected to each other as the output end of the rectifier 30.

[0105] In some embodiments, as shown in Figure 4, 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. 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.

[0106] 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 filter model.

[0107] 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 in the output loop of the rectifier 30 .

[0108] As an example, the parameters of each component in the power supply circuit may be as shown in Figure 5. It should be noted that the parameters of each component in the embodiment of the present application may include but are not limited to the parameters shown in Figure 5.

[0109] 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.

[0110] Based on the same inventive concept, embodiments of the present application also provide a circuit board. The circuit board includes the power supply circuit of any of the above embodiments. It is understood that the circuit board has the beneficial effects of the power supply circuit provided in the embodiments of the present application. For details, please refer to the detailed description of the power supply circuit in the above embodiments, and this embodiment will not be repeated here.

[0111] In some embodiments, as shown in Figure 6, 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.

[0112] 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.

[0113] The first driving filter module 411 includes a sixth capacitor C6 , and the second driving filter module 412 includes a seventh capacitor C7 .

[0114] In some embodiments, as shown in FIG6 , 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 is adjacent to the power input terminal Vin. The first input filter module 421 may also be located near the power input pin VCC. Exemplarily, the first input filter module 421 is located on one side of the driver 10. The second input filter module 422 is connected to the power input pin VCC, and is adjacent to the power input pin VCC. In other words, the second input filter module 422 is located adjacent to the power input pin VCC. The third input filter module 423 is connected to the third tap 3 of the primary winding, and is adjacent to the third tap 3 of the primary winding. In other words, the third input filter module 423 is located adjacent to the third tap 3 of the primary winding.

[0115] 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.

[0116] In some embodiments, as shown in Figure 6, 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 located close to the rectifier 30 and the power output terminal V_out.

[0117] 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.

[0118] In some embodiments, as shown in FIG. 6 , the primary-secondary filter module 44 is adjacent to the transformer 20 .

[0119] The primary-secondary filter module 44 includes an eighth capacitor C8 , which can be placed across the transformer 20 to ensure the shortest possible 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.

[0120] In the above embodiments, each filter module is respectively arranged close to the pin or device to which it is connected, which can help improve the filtering effect.

[0121] It should be noted that in the above embodiment, at least one of the multiple filter modules can be selected to be arranged next to the pin or device to which it is connected, or each of the multiple filter modules can be selected to be arranged next to the pin or device to which it is connected.

[0122] It should be noted that in Figure 6, the unmarked thick solid line (gray trace) represents a connection trace, the thick solid line (gray trace) marked as GND1 represents the first ground terminal GND1 or is connected to the first ground terminal GND1, the thick solid line (gray trace) marked as GND2 represents the second ground terminal GND2 or is connected to the second ground terminal GND2, the thick solid line (gray trace) marked as Vin represents the power input terminal Vin or is connected to the power input terminal Vin, and the thick solid line (gray trace) marked as V_out represents the power output terminal V_out or is connected to the power output terminal V_out. In addition, a hollow circle indicates a connection to the first ground terminal GND1, a solid black dot indicates a connection to the second ground terminal GND2, and a hollow square indicates a connection to a connection trace.

[0123] 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.

[0124] 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 side of the circuit board.

[0125] 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.

[0126] 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 side, the third input filter module 423 and the transformer 20 are not on the same side, and the driver 10 and the transformer 20 are not on the same side, then 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 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 side, which can avoid the impedance of the connecting vias affecting the filtering effect, and the filter loop has low resistance to the noise source, which helps to improve the filtering effect.

[0127] Other modules may be arranged on either the upper surface or the lower surface of the circuit board, and this application does not limit this.

[0128] For example, the circuit board may include multiple film layers stacked in the thickness direction of the circuit board, wherein the first ground terminal GND1 may be located in one of the film layers, and the second ground terminal GND2 may be located in another film layer. Some of the film layers may also be used to provide connection traces, which are used to connect components in the power supply circuit. Connection vias may also be provided on the film layers, which are used to connect components to the ground terminal, or the connection vias are used to connect the connection traces to components.

[0129] Based on the same inventive concept, an embodiment of the present application further provides a battery management system, including the power supply circuit of any of the above embodiments. It is understood that the battery management system has the beneficial effects of the power supply circuit provided in the embodiments of the present application. For details, please refer to the detailed description of the power supply circuit in the above embodiments, and this embodiment will not be repeated here.

[0130] Based on the same inventive concept, the present application also provides an electrical device. The electrical device includes a battery management system, which includes the power supply circuit of any of the above embodiments. It is understood that the electrical device has the beneficial effects of the power supply circuit provided in the embodiments of the present application. For details, please refer to the detailed description of the power supply circuit in the above embodiments, and this embodiment will not be repeated here.

[0131] It should be noted that in the embodiments shown in the above figures, the capacitor is shown as a single capacitor. In other embodiments, the capacitor may be an integration of series, parallel, or hybrid capacitors. The specific parameters of each device can be set according to actual needs, and this application does not limit this.

[0132] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0133] Those skilled in the art will appreciate that the embodiments described herein are intended to help readers understand the principles of this application, and it should be understood that the scope of protection of this application is not limited to such specific descriptions and embodiments. Those skilled in the art can make various other specific variations and combinations based on the technical teachings disclosed in this application without departing from the essence of this application, and such variations and combinations are still within the scope of protection of this application.

[0134] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions within the scope of the claims.

Claims

1. A power supply circuit, comprising a driver, a transformer, a rectifier and a filter module; 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; in, The filter module includes at least one of a driving filter module, an input filter module, an output filter module, and a primary-secondary filter 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, wherein: 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, wherein: 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, wherein: 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.

5. The power supply circuit according to claim 3, wherein: The first input filtering module and the output filtering module include the same filtering model.

6. The power supply circuit according to claim 4, wherein: The driving filter module, the second input filter module, the third input filter module and the primary-secondary filter module include a C-type filter module.

7. The power supply circuit according to claim 5, wherein: The first input filter module and the output filter module include a π-type filter model.

8. The power supply circuit according to claim 1, wherein: 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.

9. The power supply circuit according to claim 1, wherein: 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; 10. The power supply circuit according to claim 1, wherein: The primary-secondary filtering module includes an eighth capacitor, which 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.

11. The power supply circuit according to claim 1, wherein: 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.

12. A circuit board comprising the power supply circuit according to any one of claims 1 to 11.

13. The circuit board according to claim 12, wherein: 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.

14. The circuit board according to claim 12, wherein: 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.

15. The circuit board according to claim 12, wherein: The output filter module is located between the rectifier and the power output terminal.

16. The circuit board according to claim 12, wherein the primary-secondary filter module is adjacent to the transformer.

17. The circuit board according to claim 12, wherein: 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.

18. A battery management system, comprising the power supply circuit according to any one of claims 1 to 11.

19. An electrical device comprising the battery management system according to claim 18.

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