Common mode filter, filter circuit, and vehicle

Abstract

The utility model provides a common mode filter, a filter circuit and a vehicle. The common mode filter includes an input terminal, a filter device, and an output terminal. The filtering device comprises a common mode inductor. The input terminal, the common mode inductor, and the output terminal are arranged along the height direction of the filter device. The common mode inductor is connected between the input terminal and the output terminal. The common-mode filter is vertically arranged, so that the plane area occupied by the common-mode filter on a circuit board can be reduced, and the miniaturization requirement of a product is met.

Description

Technical Field

[0001] The present application relates to the field of battery production, and in particular to a common mode filter, a filtering circuit and a vehicle. Background Art

[0002] With the rapid development of new energy vehicles, the number of filter circuits in the vehicle has also increased. In order to meet the space size requirements of the vehicle, the size requirements for the matching electronic component assemblies will become smaller and smaller, the weight requirements will become lighter and lighter, and the size requirements for PCB (Printed Circuit Board) will become smaller and smaller. Therefore, higher requirements are also put forward for the device size on PCBA (Printed Circuit Board Assembly).

[0003] The high-power filter circuit commonly used in the prior art is in a planar layout. The filter circuit itself will occupy a lot of space on the PCBA, and the planar size of the PCB cannot be reduced, and the requirements for product miniaturization cannot be met. Utility Model Content

[0004] In order to solve the above technical problems, the present application provides a common mode filter, a filtering circuit and a vehicle, which have a three-dimensional layout to solve the above technical problems.

[0005] A first aspect of the present application provides a common-mode filter, which includes an input terminal, a filter device and an output terminal, the filter device includes a common-mode inductor, the input terminal, the common-mode inductor and the output terminal are arranged along the height direction of the filter device, and the common-mode inductor is connected between the input terminal and the output terminal.

[0006] A second aspect of the present application provides a filtering circuit, which includes a PCB board, a common mode filter, a connector and a wiring harness. The common mode filter is the common mode filter described in the first aspect. The PCB board, the common mode filter, the connector and the wiring harness are arranged along the height direction of the common mode filter. The output terminal of the common mode filter is connected to the PCB board, the input terminal of the common mode filter is connected to the connector, the wiring harness is connected to the connector, and the wiring harness is used to connect an interference source.

[0007] A third aspect of the present application provides a vehicle, comprising a filter circuit, an interference source and an interfered device, wherein the filter circuit is the filter circuit described in the second aspect, and the filter circuit is connected between the interference source and the interfered device.

[0008] Therefore, in the present application, the input terminal, the common-mode inductor and the output terminal of the common-mode filter are arranged along the height direction of the filter element, and the common-mode filter is arranged vertically as a whole, which can reduce the plane area occupied by the common-mode filter on the PCB board and meet the requirements of product miniaturization. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the implementation manner will be briefly introduced below. Obviously, the drawings described below are some implementation manners of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0010] Figure 1 It is a schematic diagram of the modules of a vehicle in one embodiment of the present application.

[0011] Figure 2 It is a schematic diagram of the layout of the filter circuit in the prior art.

[0012] Figure 3 FIG. 4 is a schematic diagram of the layout of a filter circuit in an embodiment of the present application.

[0013] Figure 4 It is a schematic diagram of the three-dimensional structure of a common mode filter in an embodiment of the present application.

[0014] Figure 5 for Figure 4 Schematic diagram of the decomposition.

[0015] Figure 6 for Figure 5 An enlarged schematic diagram of the first circuit board and its related components.

[0016] Figure 7 for Figure 5 Schematic diagram of the structure from another perspective.

[0017] Figure 8 for Figure 7 An enlarged schematic diagram of the second circuit board and its related components.

[0018] Fig. 9 FIG. 4 is a circuit diagram of a common mode filter in an embodiment of the present application.

[0019] Figure Number:

[0020] Vehicle 100;

[0021] Filter circuit 1, PCB board 11, filter element 12a, common mode inductor 13, connector 14, wiring harness 15;

[0022] Common mode filter 12, input terminal 121, output terminal 122;

[0023] Filter device 123, input filter capacitor 1231, first capacitor 1231a, second capacitor 1231b, third capacitor 1231c, output filter capacitor 1232, fourth capacitor 1232a, fifth capacitor 1232b, sixth capacitor 1232c;

[0024] A first circuit board 124, a second circuit board 125, and a metal sheath 126;

[0025] A first plug interface 1241 and a first connection end 1243;

[0026] A second plug interface 1251 and a second connection end 1253;

[0027] An input terminal 131 and an output terminal 132;

[0028] Interference source 200;

[0029] Interfered device 300;

[0030] Height direction H. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only 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.

[0032] In the description of the present application, the terms "first", "second", etc. are used to distinguish different objects rather than to describe a specific order, and therefore should not be understood as limiting the present application.

[0033] It should be noted that the illustrations provided in the embodiments of the present application are only used to illustrate the basic concept of the present application in a schematic manner. The illustrations only show the components related to the present application rather than being drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0034] Please refer to Figure 1 , Figure 1It is a module schematic diagram of a vehicle 100 in an embodiment of the present application. The vehicle 100 includes a filter circuit 1, an interference source 200 and an interfered device 300, and the filter circuit 1 is connected between the interference source 200 and the interfered device 300. In some embodiments, the interference source 200 is a high-voltage power supply system for the whole vehicle, and the high-voltage power supply system for the whole vehicle includes a high-voltage battery pack, a motor and a whole vehicle control device, etc., wherein high voltage refers to a voltage greater than or equal to 300V, and the whole vehicle control device includes a BCM (body control module), a BMS (Battery Management System) and various control modules; the interfered device 300 is an electronic control product component, and the electronic control product component includes a switching power supply module, an MCU (Microcontroller Unit, microcontroller unit) control module, a drive module, a power signal acquisition module, etc. Among them, when the motor starts and stops and the whole vehicle control device, etc., a common-mode interference signal will be generated and the electronic control product component will be interfered with through the power supply harness. The electronic control product component itself will also generate a common-mode interference signal and interfere with the whole vehicle control device through the power supply harness. Therefore, the filter circuit 1 is used to filter out the common mode interference between the interference source 200 and the interfered device 300. In some embodiments, the filter circuit 1 is also used to filter out the electromagnetic interference between the interference source 200 and the interfered device 300.

[0035] It is understandable that, in some other embodiments, the filter circuit 1 is also used to filter out differential mode interference between the interference source 200 and the interfered device 300, etc., which is not limited here.

[0036] Please refer to Figure 2 , Figure 2 The figure is a schematic diagram of the layout of the filter circuit in the prior art. The filter circuit 1 includes a PCB (Printed Circuit Board) 11, a filter element 12a, a common mode inductor 13, a connector 14 and a wiring harness 15. The filter element 12a, the common mode inductor 13 and the connector 14 are installed side by side on the surface of the PCB 11, and the wiring harness 15 is connected to the connector 14. Therefore, the filter element 12a, the common mode inductor 13 and the connector 14 of the filter circuit 1 are arranged in a planar manner as a whole, which occupies a large planar area of ​​the PCB 11 and cannot reduce the planar size of the PCB 11, and cannot meet the requirements of product miniaturization. Furthermore, when the filter circuit 1 is a high-power filter circuit, that is, its power is greater than or equal to 3KW, its related components are relatively large in size. Therefore, when the filter element 12a, the common-mode inductor 13 and the connector 14 of the filter circuit 1 are arranged in a planar manner as a whole, they occupy a larger plane area of ​​the PCB board 11 and cannot meet the requirements of product miniaturization.

[0037] Please refer to Figure 3 , Figure 3 The schematic diagram of the layout of the filter circuit in one embodiment of the present application. The filter circuit 1 includes a PCB board 11, a common mode filter 12, a connector 14 and a wiring harness 15. The PCB board 11, the common mode filter 12, the connector 14 and the wiring harness 15 are arranged along the height direction H of the common mode filter 12, and the common mode filter 12 is provided with an input terminal 121 and an output terminal 122 at opposite ends in the height direction H. The input terminal 121 of the common mode filter 12 is connected to the connector 14, the wiring harness 15 is connected to the connector 14, the wiring harness 15 is used to connect to the interference source 200, and the output terminal 122 of the common mode filter 12 is connected to the PCB board 11.

[0038] Thus, the PCB board 11, the common-mode filter 12, the connector 14 and the wiring harness 15 of the filter circuit 1 are arranged along the height direction H of the common-mode filter 12, and the overall layout is vertical. The plane area of ​​the PCB board 11 occupied by the common-mode filter 12, the connector 14 and the wiring harness 15 of the filter circuit 1 is reduced, the plane size of the PCB board 11 can be reduced, and the miniaturization requirement of the product is met.

[0039] Please refer to Figures 4 to 8 , Figure 4 is a schematic diagram of the three-dimensional structure of a common mode filter in an embodiment of the present application; Figure 5 for Figure 4 Schematic diagram of the decomposition of Figure 6 for Figure 5 An enlarged schematic diagram of the first circuit board and its related components; Figure 7 for Figure 5 Schematic diagram of the structure from another perspective; Figure 8 for Figure 7 An enlarged schematic diagram of the second circuit board and its related components.

[0040] For some examples, please refer to Figure 4 The common-mode filter 12 includes a filter device 123, the input terminal 121 and the output terminal 122. The filter device 123 includes a common-mode inductor 13. The input terminal 121, the common-mode inductor 13 and the output terminal 122 are arranged along a height direction H of the filter device 123. The common-mode inductor 13 is connected between the input terminal 121 and the output terminal 122.

[0041] Thus, the input terminal 121, the common-mode inductor 13 and the output terminal 122 are arranged along the height direction H of the filter element 123, so that the input terminal 121, the common-mode inductor 13 and the output terminal 122 of the common-mode filter 12 are arranged vertically as a whole, which can reduce the plane area occupied by the common-mode filter 12 on the PCB board 11, reduce the plane size of the PCB board 11, and meet the requirements of product miniaturization.

[0042] In this embodiment, the input terminal 121 is located above the common mode inductor 13, and the output terminal 122 is located below the common mode inductor 13. In other embodiments, the input terminal 121 may be located below the common mode inductor 13, and the output terminal 122 may be located above the common mode inductor 13, which is not limited here.

[0043] It can be understood that, in some other embodiments, when the filter circuit 1 is used to filter out differential mode interference, the common mode inductor can be replaced by a differential mode inductor.

[0044] For some examples, please refer to Figures 5 to 8 The filter device 123 further includes an input filter capacitor 1231 and an output filter capacitor 1232. The input filter capacitor 1231, the common mode inductor 13 and the output filter capacitor 1232 are arranged along a height direction H of the filter device.

[0045] Therefore, the filter device 123 is arranged vertically as a whole. Compared with the planar layout, the planar area of ​​the PCB board 11 occupied by the filter device 123 in the vertical layout as a whole will be reduced, which can reduce the planar size of the PCB board 11 and meet the requirements of product miniaturization.

[0046] In some embodiments, the common mode filter 12 further includes a first circuit board 124. The first circuit board 124 is located on one side of the common mode inductor 13 in the height direction H thereof. The input terminal 121 and the input filter capacitor 1231 are connected to a side of the first circuit board 124 away from the common mode inductor 13. The input terminal 131 of the common mode inductor 13 is connected to a side of the first circuit board 124 close to the common mode inductor 13.

[0047] Thus, the input terminal 121 and the input filter capacitor 1231 are located on the same side of the common-mode inductor 13, and the input terminal 121, the input filter capacitor 1231 and the input end 131 of the common-mode inductor 13 are all connected to the first circuit board 124, which can improve the connection stability of the input terminal 121, the input filter capacitor 1231 and the input end 131 of the common-mode inductor 13.

[0048] In some embodiments, the common-mode filter 12 also includes a second circuit board 125, which is located on the other side of the common-mode inductor 13 in its height direction H, the output terminal 122 and the output filter capacitor 1232 are connected to the side of the second circuit board 125 away from the common-mode inductor 13, and the output terminal 132 of the common-mode inductor 13 is connected to the side of the second circuit board 125 close to the common-mode inductor 13.

[0049] Thus, the output terminal 122 and the output filter capacitor 1232 are located on the same side of the common-mode inductor 13, and the output terminal 122, the output filter capacitor 1232 and the output end 132 of the common-mode inductor 13 are all connected to the second circuit board 125, which can improve the connection stability of the output terminal 122, the output filter capacitor 1232 and the output end 132 of the common-mode inductor 13.

[0050] In some embodiments, the common-mode filter 12 further includes a metal sheath 126, which is disposed around the common-mode inductor 13 and connected between the first circuit board 124 and the second circuit board 125, and a barrel-shaped space is formed between the metal sheath 126, the first circuit board 124, and the second circuit board 125, and the passage space is used to accommodate the common-mode inductor 13.

[0051] Therefore, the barrel-shaped space can shield electromagnetic interference signals and improve the anti-interference performance of the common mode filter 12 .

[0052] For some examples, please refer to Figure 5 The common mode inductor 13 includes a ring-shaped iron core and two coils wound on the ring-shaped iron core. The two coils have the same number of turns and phase, but are wound in opposite directions. The common mode inductor 13 includes two input terminals 131. The input terminal 121 correspondingly includes two input terminals 121. The two input terminals 121 are respectively connected to the two input terminals 131 through the internal wiring of the first circuit board 124. Please refer to Figure 5 and Fig. 9 The input filter capacitor 1231 includes a first capacitor 1231a, a second capacitor 1231b and a third capacitor 1231c, wherein the first capacitor 1231a is connected across the two input terminals 121, one end of the second capacitor 1231b is connected to one of the two input terminals 121, and the other end is grounded by connecting to the metal sheath 126, and one end of the third capacitor 1231c is connected to one of the two input terminals 121, and the other end is grounded by connecting to the metal sheath 126.

[0053] Therefore, common mode interference and electromagnetic interference filtering are achieved through the input filter capacitor 1231 and the common mode inductor 13.

[0054] For some examples, please refer to Figure 7 The common mode inductor 13 includes two output terminals 132, and the output terminal 122 correspondingly includes two output terminals 122, and the two output terminals 122 are respectively connected to the two output terminals 132 through the internal wiring of the second circuit board 125. Please refer to Figure 7 and Fig. 9 The output filter capacitor 1232 includes a fourth capacitor 1232a, a fifth capacitor 1232b and a sixth capacitor 1232c, wherein the fourth capacitor 1232a is connected across the two output terminals 122, one end of the fifth capacitor 1232b is connected to one of the two output terminals 122, and the other end is grounded by being connected to the metal sheath 126, and one end of the sixth capacitor 1232c is connected to one of the two output terminals 122, and the other end is grounded by being connected to the metal sheath 126.

[0055] In some embodiments, please refer again to Figure 5 and Figure 6 , two first plug-in ports 1241 are arranged at intervals on the first circuit board 124, and the two input terminals 121 are respectively plugged into the two first plug-in ports 1241. The first capacitor 1231a is connected across the two first plug-in ports 1241, and the second capacitor 1231b and the third capacitor 1231c are arranged adjacent to one end of the two first plug-in ports 1241. Therefore, the first capacitor 1231a, the second capacitor 1231b and the third capacitor 1231c are arranged in a triangular shape. Two first connection terminals 1243 are also arranged at intervals on the first circuit board 124, and the two first connection terminals 1243 are respectively arranged adjacent to the other ends of the two first plug-in ports 1241. The two first connection terminals 1243 are respectively connected to the two input terminals 131 of the common mode inductor 13.

[0056] Therefore, the input terminal 121, the first capacitor 1231a, the second capacitor 1231b, the third capacitor 1231c, and the input end 131 of the common mode inductor 13 are all connected to the first circuit board 124, which can improve the connection stability.

[0057] In some embodiments, please refer again to Figure 7 and Figure 8, two second plug-in ports 1251 are arranged at intervals on the second circuit board 125, and the two output terminals 122 are respectively plugged into the two second plug-in ports 1251. The fourth capacitor 1232a is connected across the two second plug-in ports 1251, and the fifth capacitor 1232b and the sixth capacitor 1232c are arranged adjacent to one end of the two second plug-in ports 1251. Therefore, the fourth capacitor 1232a, the fifth capacitor 1232b and the sixth capacitor 1232c are arranged in a triangular shape. Two second connection terminals 1253 are also arranged at intervals on the second circuit board 125, and the two second connection terminals 1253 are respectively arranged adjacent to the other ends of the two second plug-in ports 1251. The two second connection terminals 1253 are respectively connected to the two output terminals 132 of the common mode inductor 13.

[0058] Therefore, the output terminal 122, the fourth capacitor 1232a, the fifth capacitor 1232b, the sixth capacitor 1232c, and the output end 132 of the common mode inductor 13 are all connected to the second circuit board 125, which can improve the connection stability.

[0059] It can be understood that, in other embodiments, the common-mode inductor 13 may include four coils or eight coils wound on a ring-shaped iron core, and therefore, the number of input terminals 131 and output terminals 132 of the common-mode inductor 13 is not limited to two, but may also be four or eight, etc., which is not limited here.

[0060] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0061] The above is an implementation method of the embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the embodiment of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. A common mode filter, characterized in that: The common mode filter comprises an input terminal, a filter element and an output terminal, the filter element comprises a common mode inductor, the input terminal, the common mode inductor and the output terminal are arranged along the height direction of the filter element, and the common mode inductor is connected between the input terminal and the output terminal.

2. The common mode filter according to claim 1, characterized in that: The filter device also includes an input filter capacitor and an output filter capacitor. The input filter capacitor, the common-mode inductor and the output filter capacitor are arranged along the height direction of the filter device. The input filter capacitor is connected between the input terminal and the common-mode inductor, and the output filter capacitor is connected between the output terminal and the common-mode inductor.

3. The common mode filter according to claim 2, characterized in that: The common-mode filter also includes a first circuit board, which is located on one side of the common-mode inductor along its height direction, the input terminal and the input-end filter capacitor are connected to a side of the first circuit board away from the common-mode inductor, and the input end of the common-mode inductor is connected to a side of the first circuit board close to the common-mode inductor.

4. The common mode filter according to claim 3, characterized in that: The common-mode filter also includes a second circuit board, which is located on the other side of the common-mode inductor in its height direction, the output terminal and the output filter capacitor are connected to the side of the second circuit board away from the common-mode inductor, and the output end of the common-mode inductor is connected to the side of the second circuit board close to the common-mode inductor.

5. The common mode filter according to claim 4, characterized in that: The common mode filter further comprises a metal sheath, which is arranged around the common mode inductor and connected between the first circuit board and the second circuit board. The input filter capacitor and the output filter capacitor can be grounded through the metal sheath.

6. The common mode filter according to any one of claims 3 to 5, characterized in that: The common-mode inductor includes two input terminals, and the input-end filter capacitor includes a first capacitor, a second capacitor and a third capacitor, wherein the first capacitor is connected across the two input terminals; one end of the second capacitor is connected to one of the two input terminals, and the other end is grounded; one end of the third capacitor is connected to one of the two input terminals, and the other end is grounded.

7. The common mode filter according to claim 6, characterized in that: Two first plug interfaces are arranged at intervals on the first circuit board, the two input terminals are respectively plugged into the two first plug interfaces, the first capacitor is connected across the two first plug interfaces, and the second capacitor and the third capacitor are respectively arranged adjacent to one end of the two first plug interfaces; two first connection ends are also arranged at intervals on the first circuit board, the two first connection ends are respectively arranged adjacent to the other ends of the two first plug interfaces, and the two first connection ends are respectively connected to the two input ends of the common mode inductor.

8. The common mode filter according to any one of claims 4 to 5, characterized in that: The common-mode inductor includes two output terminals; the output-end filter capacitor includes a fourth capacitor, a fifth capacitor and a sixth capacitor; wherein the fourth capacitor is connected across the two output terminals; one end of the fifth capacitor is connected to one of the two output terminals, and the other end is grounded; one end of the sixth capacitor is connected to one of the two output terminals, and the other end is grounded.

9. The common mode filter according to claim 8, characterized in that: Two second plug interfaces are arranged at intervals on the second circuit board; the two output terminals are respectively plugged into the two second plug interfaces; the fourth capacitor is connected across the two second plug interfaces; the fifth capacitor and the sixth capacitor are respectively arranged adjacent to one end of the two second plug interfaces; two second connection ends are also arranged at intervals on the second circuit board; the two second connection ends are respectively arranged adjacent to the other ends of the two second plug interfaces; the two second connection ends are respectively connected to the two output ends of the common mode inductor.

10. A filter circuit, characterized in that: The filtering circuit includes a PCB board, a common mode filter, a connector and a wiring harness, the common mode filter is the common mode filter according to any one of claims 1 to 9, the PCB board, the common mode filter, the connector and the wiring harness are arranged along the height direction of the common mode filter, the output terminal of the common mode filter is connected to the PCB board, the input terminal of the common mode filter is connected to the connector, the wiring harness is connected to the connector, and the wiring harness is used to connect an interference source.

11. A vehicle, characterized in that: The vehicle comprises a filter circuit, an interference source and an interfered device, wherein the filter circuit is the filter circuit according to claim 10, and the filter circuit is connected between the interference source and the interfered device.

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