Filter circuit, filter, electric driving device and electric vehicle
Patent Information
- Application Number
- CN202421050239.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-15
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-05-15
AI Technical Summary
The prior art has poor effect in reducing electromagnetic radiation of electric drive devices of new energy vehicles, and shielding materials are prone to aging and have limited shielding effects.
A filter circuit is designed, including a first conductive component, a second conductive component, a first magnetic ring and a second magnetic ring. Through a plurality of common mode capacitors and differential mode capacitors, common mode filtering and differential mode filtering are realized, so as to increase the impedance of the common mode circuit and reduce electromagnetic radiation.
通过多次共模滤波和差模滤波，显著提高了对电力驱动装置产生的电磁辐射的过滤效果，满足CISPR25.2016标准的Class3等级。
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Figure CN222638390U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of new energy vehicles, and in particular to a filter circuit and filter, an electric drive device and an electric vehicle. Background Art
[0002] In the development process of new energy vehicle technology, the electric drive device, as the core power component, includes high-voltage components that generate electromagnetic fields during operation, thereby generating electromagnetic radiation. Excessive electromagnetic radiation has certain negative effects on other components and users of new energy vehicles, so it is necessary to control the electromagnetic radiation generated by them. At present, the electromagnetic radiation control method of electric drive devices is to reduce the leakage of electromagnetic radiation by adding shielding materials around the system of new energy vehicles. However, shielding materials are prone to aging and have limited shielding of electromagnetic radiation, resulting in poor effect in reducing the electromagnetic radiation of electric drive devices. Utility Model Content
[0003] Based on this, it is necessary to provide a filter circuit and filter, an electric drive device and an electric vehicle that can improve the filtering effect of the electromagnetic radiation generated by the electric drive device.
[0004] A filter circuit, comprising:
[0005] a first conductive component, a second conductive component, a first magnetic ring, and a second magnetic ring; wherein the first end of the first conductive component is a first power input end, and the second end of the first conductive component is a first power output end; the first end of the second conductive component is a second power input end, and the second end of the second conductive component is a second power output end; the first end of the first conductive component and the first end of the second conductive component pass through the first magnetic ring, and the second end of the first conductive component and the second end of the second conductive component pass through the second magnetic ring; the filter circuit further includes:
[0006] a plurality of common-mode capacitors, one end of each of the common-mode capacitors being connected to the first conductive component or the second conductive component, and the other end of each of the common-mode capacitors being grounded; wherein one end of one of the plurality of common-mode capacitors is connected to the first power input terminal, and one end of another of the plurality of common-mode capacitors is connected to the second power input terminal;
[0007] A plurality of differential mode capacitors, one end of each differential mode capacitor is connected to the first conductive component, and the other end of each differential mode capacitor is connected to the second conductive component; wherein at least one of the differential mode capacitors is connected between the first power input terminal and the second power input terminal.
[0008] In one embodiment, the plurality of common-mode capacitors are respectively a first capacitor, a third capacitor, a fourth capacitor, a sixth capacitor, a seventh capacitor and an eighth capacitor;
[0009] Wherein, one end of the first capacitor is connected to the first power input terminal, the other end of the first capacitor is grounded, one end of the third capacitor is connected to the second power input terminal, and the other end of the third capacitor is grounded;
[0010] The connection point between the fourth capacitor and the first conductive component and the seventh capacitor and the first conductive component are both located in a region of the first conductive component between the first magnetic ring and the second magnetic ring; the connection point between the sixth capacitor and the second conductive component and the eighth capacitor and the second conductive component are both located in a region of the second conductive component between the first magnetic ring and the second magnetic ring.
[0011] In one embodiment, the plurality of differential mode capacitors are respectively a second capacitor and a fifth capacitor;
[0012] Wherein, one end of the second capacitor is connected to the first power input terminal, and the other end of the second capacitor is connected to the second power input terminal;
[0013] One end of the fifth capacitor is connected to one end of the fourth capacitor, and the other end of the fifth capacitor is connected to one end of the sixth capacitor.
[0014] In one embodiment, the second capacitor is used to filter out differential mode interference in a frequency band from 150 kHz to 5 MHz, and the fifth capacitor is used to filter out differential mode interference in a frequency band from 50 MHz to 200 MHz.
[0015] A filter, comprising:
[0016] Insulating shell, positive busbar, negative busbar, grounding busbar, first magnetic ring and second magnetic ring;
[0017] Wherein, the positive busbar and the negative busbar are located in the insulating shell, and both ends of the positive busbar and the negative busbar pass through the insulating shell, the first end of the positive busbar is the first power input end, the second end of the positive busbar is the first power output end, the first end of the negative busbar is the second power input end, and the second end of the negative busbar is the second power output end, the first magnetic ring and the second magnetic ring are located in the insulating shell, the first end of the positive busbar and the first end of the negative busbar pass through the first magnetic ring, the second end of the positive busbar and the second end of the negative busbar pass through the second magnetic ring, the grounding busbar is located in the insulating shell, and one end of the grounding busbar passes through the insulating shell; the filter also includes:
[0018] A plurality of common-mode capacitors, one end of each of the common-mode capacitors being connected to the positive busbar, and the other end of each of the common-mode capacitors being connected to the ground busbar; wherein one end of one of the plurality of common-mode capacitors is connected to the first power input terminal, and one end of another of the plurality of common-mode capacitors is connected to the second power input terminal;
[0019] A plurality of differential mode capacitors, one end of each differential mode capacitor is connected to the first end of the positive busbar, and the other end of each differential mode capacitor is connected to the second end of the positive busbar; wherein at least one of the differential mode capacitors is connected between the first power input terminal and the second power input terminal.
[0020] In one embodiment, the plurality of common-mode capacitors are respectively a first capacitor, a third capacitor, a fourth capacitor, a sixth capacitor, a seventh capacitor and an eighth capacitor;
[0021] Wherein, the first capacitor, the third capacitor, the fourth capacitor, the sixth capacitor, the seventh capacitor, the eighth capacitor and the plurality of differential mode capacitors are located in the insulating housing, one end of the first capacitor is connected to the first power input terminal, and the other end of the first capacitor is connected to the ground busbar; one end of the third capacitor is connected to the second power input terminal, and the other end of the third capacitor is connected to the ground busbar;
[0022] The connection point between the first capacitor and the positive busbar is located in the area of the positive busbar between the positive busbar and the first magnetic ring. The connection point between the third capacitor and the negative busbar is located in the area of the negative busbar between the negative busbar and the first magnetic ring. The connection point between the fourth capacitor and the positive busbar and the connection point between the seventh capacitor and the positive busbar are both located in the area of the positive busbar between the first magnetic ring and the second magnetic ring. The connection point between the sixth capacitor and the negative busbar and the connection point between the eighth capacitor and the negative busbar are both located in the area of the negative busbar between the first magnetic ring and the second magnetic ring.
[0023] In one embodiment, the plurality of differential mode capacitors are respectively a second capacitor and a fifth capacitor; wherein one end of the second capacitor is connected to the first power input terminal, and the other end of the second capacitor is connected to the second power input terminal;
[0024] One end of the fifth capacitor is connected to one end of the fourth capacitor, and the other end of the fifth capacitor is connected to one end of the sixth capacitor.
[0025] In one embodiment, the second capacitor is used to filter out differential mode interference in a frequency band from 150 kHz to 5 MHz, and the fifth capacitor is used to filter out differential mode interference in a frequency band from 50 MHz to 200 MHz.
[0026] An electric drive device is applied to an automobile, and the electric drive device comprises the filter described in the above embodiment.
[0027] An electric vehicle includes the electric drive device described in the above embodiment, wherein one end of a plurality of common-mode capacitors is connected to a first conductive component or a second conductive component, and the other end of the common-mode capacitor is grounded, so that the electromagnetic radiation generated by the electric drive device can be introduced into the ground through the first conductive component and the second conductive component through the plurality of common-mode capacitors, thereby performing common-mode filtering. The first end of the first conductive component and the second conductive component passes through the first magnetic ring, and the second end of the first conductive component and the second end of the second conductive component pass through the second magnetic ring, which can increase the impedance of the common-mode loop, reduce the current of the common-mode loop, and perform common-mode filtering. One end of a plurality of differential-mode capacitors is connected to the first conductive component, and the other end of the differential-mode capacitor is connected to the second conductive component to perform differential-mode filtering. By performing multiple common-mode filtering and differential-mode filtering on the electromagnetic radiation generated by the electric drive device, the filtering effect of the electromagnetic radiation generated by the electric drive device can be improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0029] Figure 1 is a structural schematic diagram of a filter circuit according to an embodiment;
[0030] Figure 2 for Figure 1 The filtering principle diagram of the filtering circuit shown;
[0031] Figure 3 A schematic diagram of the test results of electromagnetic radiation of an electric drive device without a filter circuit;
[0032] Figure 4 A schematic diagram of the test results of electromagnetic radiation of an electric drive device provided with the filter circuit disclosed in the present application;
[0033] Figure 5 FIG. 4 is a schematic diagram of the structure of a filter according to an embodiment of the present invention. DETAILED DESCRIPTION
[0034] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.
[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.
[0036] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.
[0037] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.
[0038] It can be understood that “at least one” means one or more, “plurality” means two or more, and “at least a portion of an element” means a part or all of an element.
[0039] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.
[0040] like Figure 1As shown, a filter circuit 100 of an embodiment includes a first conductive component 101, a second conductive component 102, a first magnetic ring 103 and a second magnetic ring 104; wherein the first end of the first conductive component 101 is a first power input terminal P11, and the second end of the first conductive component 101 is a first power output terminal P21; the first end of the second conductive component 102 is a second power input terminal P12, and the second end of the second conductive component 102 is a second power output terminal P22; the first end of the first conductive component 101 and the first end of the second conductive component 102 pass through the first magnetic ring 103, and the second end of the first conductive component 101 and the second end of the second conductive component 102 pass through the second magnetic ring 104; the filter circuit 100 also includes:
[0041] Multiple common-mode capacitors, one end of the common-mode capacitor is connected to the first conductive component 101 or the second conductive component 102, and the other end of the common-mode capacitor is grounded; wherein one end of a common-mode capacitor among the multiple common-mode capacitors is connected to the first power input terminal P11, such as Figure 1 The first capacitor C1 and the third capacitor C3 in the common mode capacitors, one end of another common mode capacitor in the plurality of common mode capacitors is connected to the second power input terminal P12;
[0042] A plurality of differential mode capacitors, one end of the differential mode capacitor is connected to the first conductive component, and the other end of the differential mode capacitor is connected to the second conductive component 102; wherein at least one differential mode capacitor is connected between the first power input terminal P11 and the second power input terminal P12, such as Figure 1 The second capacitor C2 in.
[0043] Specifically, the inverter module in the electric drive device usually includes multiple IGBTs (Insulated Gate Bipolar Transistor). IGBTs generate radio frequency interference during the process of fast opening and closing. Some radio frequency interference propagates from the inverter module to the DC power supply terminal, which will have an adverse effect on other electronic components. In this embodiment, the first end of the first conductive component 101 serves as the first power input terminal P11 of the filter circuit 100, and the first end of the second conductive component 102 serves as the second power input terminal P12 of the filter circuit 100, which are connected to the output terminal of the inverter module in the electric drive device. Through the filtering effect of the filter circuit 100, the electromagnetic radiation generated by the electric drive device is reduced.
[0044] like Figure 1 As shown, the multiple common-mode capacitors of the filter circuit 100 of one embodiment are respectively a first capacitor C1, a third capacitor C3, a fourth capacitor C4, a sixth capacitor C6, a seventh capacitor C7 and an eighth capacitor C8;
[0045] One end of the first capacitor C1 is connected to the first power input terminal P11, and the other end of the first capacitor C1 is grounded; one end of the third capacitor C3 is connected to the second power input terminal P12, and the other end of the third capacitor C3 is grounded;
[0046] The connection point between the fourth capacitor C4 and the first conductive component 101 and the seventh capacitor C7 and the first conductive component 101 are both located in the area of the first conductive component 101 between the first magnetic ring 103 and the second magnetic ring 104; the connection point between the sixth capacitor C6 and the second conductive component 102 and the eighth capacitor C8 and the second conductive component 102 are both located in the area of the second conductive component 102 between the first magnetic ring 103 and the second magnetic ring 104.
[0047] like Figure 2 As shown, the multiple differential mode capacitors of the filter circuit 200 of one embodiment are respectively a second capacitor C2 and a fifth capacitor C5;
[0048] One end of the second capacitor C2 is connected to the first power input terminal P11, and the other end of the second capacitor C2 is connected to the second power input terminal P12;
[0049] One end of the fifth capacitor C5 is connected to one end of the fourth capacitor C4, and the other end of the fifth capacitor C5 is connected to one end of the sixth capacitor C6.
[0050] Combination Figure 2 right Figure 1 The working principle of the filter circuit 100 is described below.
[0051] One end of the first capacitor C1 is connected to the first power input terminal P11, and the other end of the first capacitor C1 is grounded. One end of the third capacitor C3 is connected to the second power input terminal P12, and the other end of the third capacitor C3 is grounded. One end of the fourth capacitor C4 is connected to one end of the seventh capacitor C7, and the other end of the seventh capacitor C7 is grounded. One end of the sixth capacitor C6 is connected to one end of the eighth capacitor C8, and the other end of the sixth capacitor C6 is grounded. One end of the eighth capacitor C8 is connected to the first power output terminal P21, and the other end of the eighth capacitor C8 is grounded. The first capacitor C1, the third capacitor C3, the fourth capacitor C4, the sixth capacitor C6, the seventh capacitor C7 and the eighth capacitor C8 are Y capacitors, which can attenuate common mode interference. The second capacitor C2 and the fifth capacitor C5 are connected between the first conductive component 101 and the second conductive component 102. The second capacitor C2 and the fifth capacitor C5 are X capacitors, which can attenuate differential mode interference. The first magnetic ring 103 and the second magnetic ring 104 can increase the impedance of the common mode loop and reduce the current of the common mode loop, thereby attenuating the common mode interference. In addition, the first magnetic ring 103, the second magnetic ring 104, the first capacitor C1, the third capacitor C3, the fourth capacitor C4, the sixth capacitor C6, the seventh capacitor C7 and the eighth capacitor C8 form a T-type filter, which can attenuate common mode interference.
[0052] The electromagnetic radiation generated by the inverter module of the electric drive device is first attenuated under the action of the first-stage common-mode filter module, that is, the first capacitor C1 and the third capacitor C3, and then attenuated under the action of the first-stage differential-mode filter module, that is, the second capacitor C2, and then attenuated under the action of the second-stage common-mode filter module, that is, the first magnetic ring 103, and then attenuated under the action of the third-stage common-mode filter module, that is, the fourth capacitor C4 and the sixth capacitor C6, and then attenuated under the action of the second-stage differential-mode filter module, that is, the fifth capacitor C5, and then attenuated under the action of the fourth-stage common-mode filter module, that is, the seventh capacitor C7 and the eighth capacitor C8, and then attenuated under the action of the fifth-stage common-mode filter module, that is, the second magnetic ring 104. In other words, the electromagnetic radiation generated by the inverter module of the electric drive device can improve the filtering effect of the electromagnetic radiation of the electric drive device after multiple common-mode filtering and multiple differential-mode filtering.
[0053] In an exemplary embodiment, Figure 1 The second capacitor C2 in the filter circuit 100 is used to filter out differential mode interference within a frequency band of 150 kHz to 5 MHz, and the fifth capacitor C5 is used to filter out differential mode interference within a frequency band of 50 MHz to 200 MHz.
[0054] The applicant verified the effectiveness of the filter circuit 100 disclosed in this application through experiments.
[0055] like Figure 3As shown, a schematic diagram of the test results of electromagnetic radiation of the electric drive device without the filter circuit 100 is provided, as shown in FIG. Figure 4 As shown, a schematic diagram of the test results of electromagnetic radiation of an electric drive device provided with the filter circuit 100 disclosed in the present application is provided. Figure 3 and Figure 4 In the figure, the horizontal axis is frequency in Hz, and the vertical axis is the conducted emission value in dBuV. Figure 3 L1 is the peak curve, L2 is the average curve, Figure 4 L3 is the peak curve, and L4 is the average curve. Figure 3 and Figure 4 It can be seen that after the filter circuit 100 disclosed in the present application is provided in the electric drive device, electromagnetic radiation can be well suppressed, so that the electric drive device can meet the Class 3 level of the CISPR25.2016 standard.
[0056] like Figure 5 As shown, a filter 500 of an embodiment includes an insulating housing, a positive busbar 101, a negative busbar 102, a ground busbar, a first magnetic ring 103 and a second magnetic ring 104;
[0057] Among them, the positive busbar 101 and the negative busbar 102 are located in the insulating shell and correspond to the first conductive component 101 and the second conductive component 102 in the above embodiment respectively, and both ends of the positive busbar 101 and the negative busbar 102 pass through the insulating shell, the first end of the positive busbar 101 is the first power input terminal P11, the second end of the positive busbar 101 is the first power output terminal P21, the first end of the negative busbar 102 is the second power input terminal P12, and the second end of the negative busbar 102 is the second power output terminal P22. The first magnetic ring 103 and the second magnetic ring 104 are located in the insulating shell, the first end of the positive busbar 101 and the first end of the negative busbar 102 pass through the first magnetic ring 103, the second end of the positive busbar 101 and the second end of the negative busbar 102 pass through the second magnetic ring 104, the grounding busbar is located in the insulating shell, and one end of the grounding busbar passes through the insulating shell; the filter 500 also includes:
[0058] Multiple common-mode capacitors, one end of the common-mode capacitor is connected to the positive busbar 101, and the other end of the common-mode capacitor is connected to the ground busbar; wherein one end of one of the multiple common-mode capacitors is connected to the first power input terminal P11, and one end of another common-mode capacitor of the multiple common-mode capacitors is connected to the second power input terminal P12;
[0059] Multiple differential mode capacitors, one end of the differential mode capacitor is connected to the first end of the positive busbar 101, and the other end of the differential mode capacitor is connected to the second end of the positive busbar 101; wherein at least one differential mode capacitor is connected between the first power input terminal P11 and the second power input terminal P12.
[0060] Optionally, the insulating housing is made by injection molding. In this embodiment, the positive busbar 101, the negative busbar 102, and the ground busbar are fixed at the positions where they pass through the insulating housing to ensure stability. A mounting hole is opened on the outside of the insulating housing, and the filter 500 can be installed inside the chassis of the electric drive device by fasteners (such as screws).
[0061] like Figure 5 As shown, a plurality of common-mode capacitors of the filter 500 of an embodiment are respectively a first capacitor C1, a third capacitor C3, a fourth capacitor C4, a sixth capacitor C6, a seventh capacitor C7 and an eighth capacitor C8;
[0062] Among them, the first capacitor C1, the third capacitor C3, the fourth capacitor C4, the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8 and a plurality of differential mode capacitors are located in the insulating housing, one end of the first capacitor C1 is connected to the first power input terminal P11, and the other end of the first capacitor C1 is connected to the ground busbar; one end of the third capacitor C3 is connected to the second power input terminal P12, and the other end of the third capacitor C3 is connected to the ground busbar;
[0063] The connection point between the first capacitor C1 and the positive busbar 101 is located in the area of the positive busbar 101 between the positive busbar 101 and the first magnetic ring 103. The connection point between the third capacitor C3 and the negative busbar 102 is located in the area of the negative busbar 102 between the negative busbar 102 and the first magnetic ring 103. The connection point between the fourth capacitor C4 and the positive busbar 101 and the connection point between the seventh capacitor C7 and the positive busbar 101 are both located in the area of the positive busbar 101 between the first magnetic ring 103 and the second magnetic ring 104. The connection point between the sixth capacitor C6 and the negative busbar 102 and the connection point between the eighth capacitor C8 and the negative busbar 102 are both located in the area of the negative busbar 102 between the first magnetic ring 103 and the second magnetic ring 104.
[0064] like Figure 5 As shown, the multiple differential mode capacitors of the filter 500 of one embodiment are respectively a second capacitor C2 and a fifth capacitor C5; wherein one end of the second capacitor C2 is connected to the first power input terminal P11, and the other end of the second capacitor C2 is connected to the second power input terminal P12;
[0065] One end of the fifth capacitor C5 is connected to the first power input terminal P11, and the other end of the fifth capacitor C5 is connected to the second power input terminal P12;
[0066] The connection point between the second capacitor C2 and the positive busbar 101 is located in the area of the positive busbar 101 between the positive busbar 101 and the first magnetic ring 103 , and the connection point between the second capacitor C2 and the negative busbar 102 is located in the area of the negative busbar 102 between the negative busbar 102 and the first magnetic ring 103 .
[0067] In an exemplary embodiment, Figure 5 The second capacitor C2 in the filter 500 is used to filter out differential mode interference within a frequency band of 150 kHz to 5 MHz, and the fifth capacitor C5 is used to filter out differential mode interference within a frequency band of 50 MHz to 200 MHz.
[0068] In one embodiment, an electric drive device is provided for use in an automobile. The electric drive device includes the filter 500 in the above embodiments.
[0069] In one embodiment, an electric vehicle is provided, comprising the electric drive device in the above embodiment.
[0070] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.
[0071] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0072] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the present application. It should be noted that, for a person of ordinary skill in the art, several modifications and improvements may be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.
Claims
1. A filter circuit, characterized in that: The electric drive device applied to an automobile, the filter circuit comprises a first conductive component, a second conductive component, a first magnetic ring and a second magnetic ring; wherein the first end of the first conductive component is a first power input end, and the second end of the first conductive component is a first power output end; the first end of the second conductive component is a second power input end, and the second end of the second conductive component is a second power output end; the first end of the first conductive component and the first end of the second conductive component pass through the first magnetic ring, and the second end of the first conductive component and the second end of the second conductive component pass through the second magnetic ring; the filter circuit further comprises: a plurality of common-mode capacitors, one end of each of the common-mode capacitors being connected to the first conductive component or the second conductive component, and the other end of each of the common-mode capacitors being grounded; wherein one end of one of the plurality of common-mode capacitors is connected to the first power input terminal, and one end of another of the plurality of common-mode capacitors is connected to the second power input terminal; A plurality of differential mode capacitors, one end of each differential mode capacitor is connected to the first conductive component, and the other end of each differential mode capacitor is connected to the second conductive component; wherein at least one of the differential mode capacitors is connected between the first power input terminal and the second power input terminal.
2. The filter circuit according to claim 1, characterized in that: The plurality of common-mode capacitors are respectively a first capacitor, a third capacitor, a fourth capacitor, a sixth capacitor, a seventh capacitor and an eighth capacitor; Wherein, one end of the first capacitor is connected to the first power input terminal, the other end of the first capacitor is grounded, one end of the third capacitor is connected to the second power input terminal, and the other end of the third capacitor is grounded; The connection point between the fourth capacitor and the first conductive component and the seventh capacitor and the first conductive component are both located in a region of the first conductive component between the first magnetic ring and the second magnetic ring; the connection point between the sixth capacitor and the second conductive component and the eighth capacitor and the second conductive component are both located in a region of the second conductive component between the first magnetic ring and the second magnetic ring.
3. The filter circuit according to claim 2, characterized in that: The plurality of differential mode capacitors are respectively a second capacitor and a fifth capacitor; Wherein, one end of the second capacitor is connected to the first power input terminal, and the other end of the second capacitor is connected to the second power input terminal; One end of the fifth capacitor is connected to one end of the fourth capacitor, and the other end of the fifth capacitor is connected to one end of the sixth capacitor.
4. The filter circuit according to claim 3, characterized in that: The second capacitor is used to filter out differential mode interference within a frequency band of 150 kHz to 5 MHz, and the fifth capacitor is used to filter out differential mode interference within a frequency band of 50 MHz to 200 MHz.
5. A filter, characterized in that: Applicable to an electric drive device of an automobile, the filter comprises an insulating housing, a positive busbar, a negative busbar, a ground busbar, a first magnetic ring and a second magnetic ring; Wherein, the positive busbar and the negative busbar are located in the insulating shell, and both ends of the positive busbar and the negative busbar pass through the insulating shell, the first end of the positive busbar is the first power input end, the second end of the positive busbar is the first power output end, the first end of the negative busbar is the second power input end, and the second end of the negative busbar is the second power output end, the first magnetic ring and the second magnetic ring are located in the insulating shell, the first end of the positive busbar and the first end of the negative busbar pass through the first magnetic ring, the second end of the positive busbar and the second end of the negative busbar pass through the second magnetic ring, the grounding busbar is located in the insulating shell, and one end of the grounding busbar passes through the insulating shell; the filter also includes: A plurality of common-mode capacitors, one end of each of the common-mode capacitors being connected to the positive busbar, and the other end of each of the common-mode capacitors being connected to the ground busbar; wherein one end of one of the plurality of common-mode capacitors is connected to the first power input terminal, and one end of another of the plurality of common-mode capacitors is connected to the second power input terminal; A plurality of differential mode capacitors, one end of each differential mode capacitor is connected to the first end of the positive busbar, and the other end of each differential mode capacitor is connected to the second end of the positive busbar; wherein at least one of the differential mode capacitors is connected between the first power input terminal and the second power input terminal.
6. The filter according to claim 5, characterized in that The plurality of common-mode capacitors are respectively a first capacitor, a third capacitor, a fourth capacitor, a sixth capacitor, a seventh capacitor and an eighth capacitor; Wherein, the first capacitor, the third capacitor, the fourth capacitor, the sixth capacitor, the seventh capacitor, the eighth capacitor and the plurality of differential mode capacitors are located in the insulating housing, one end of the first capacitor is connected to the first power input terminal, and the other end of the first capacitor is connected to the ground busbar; one end of the third capacitor is connected to the second power input terminal, and the other end of the third capacitor is connected to the ground busbar; The connection point between the first capacitor and the positive busbar is located in the area of the positive busbar between the positive busbar and the first magnetic ring. The connection point between the third capacitor and the negative busbar is located in the area of the negative busbar between the negative busbar and the first magnetic ring. The connection point between the fourth capacitor and the positive busbar and the connection point between the seventh capacitor and the positive busbar are both located in the area of the positive busbar between the first magnetic ring and the second magnetic ring. The connection point between the sixth capacitor and the negative busbar and the connection point between the eighth capacitor and the negative busbar are both located in the area of the negative busbar between the first magnetic ring and the second magnetic ring.
7. The filter according to claim 6, characterized in that The multiple differential mode capacitors are respectively a second capacitor and a fifth capacitor; wherein one end of the second capacitor is connected to the first power input terminal, and the other end of the second capacitor is connected to the second power input terminal; One end of the fifth capacitor is connected to one end of the fourth capacitor, and the other end of the fifth capacitor is connected to one end of the sixth capacitor.
8. The filter according to claim 7, characterized in that The second capacitor is used to filter out differential mode interference within a frequency band of 150 kHz to 5 MHz, and the fifth capacitor is used to filter out differential mode interference within a frequency band of 50 MHz to 200 MHz.
9. An electric drive device, characterized in that: Applied to an automobile, the electric drive device comprises the filter according to any one of claims 5 to 8.
10. An electric vehicle, characterized in that: Comprising the electric drive device as claimed in claim 9.