Filter circuit, filter, electric power filter device and electric vehicle
By designing a filter containing common mode and differential mode filter circuits in new energy vehicles, the problem that the existing technology cannot effectively reduce electromagnetic radiation is solved, and higher system stability and electromagnetic compatibility are achieved.
Patent Information
- Application Number
- CN202421860312.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-02
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-08-02
AI Technical Summary
Existing high-voltage filters cannot effectively reduce electromagnetic radiation from new energy vehicles, resulting in reduced system stability and electromagnetic compatibility not meeting relevant standards.
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 combination of a plurality of common mode capacitors and differential mode capacitors, common mode filtering and differential mode filtering are realized, increasing the impedance of the common mode circuit and reducing electromagnetic radiation.
Through multiple common mode filtering and differential mode filtering, electromagnetic radiation is effectively reduced, the stability and electromagnetic compatibility of the system are improved, and the requirements of relevant standards are met.
Smart Images
Figure CN223024299U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of new energy vehicles, and particularly to a filtering circuit, a filter, a power filtering device, and an electric vehicle. Background Art
[0002] With the popularization of new energy vehicles, key components such as high-voltage battery systems, motor controllers, and charging systems have increasingly higher requirements for the stability and safety of the electrical system. Since high-voltage inverter devices such as motor controllers and generator controllers will generate a large amount of electromagnetic interference, this electromagnetic interference will spread to other related devices through high-voltage DC busbars and cables, reducing the stability of the system and making the device unable to meet relevant electromagnetic compatibility standards. At present, as an important part of the system, the existing high-voltage filters have the problem of being unable to effectively reduce electromagnetic radiation. Summary of the Utility Model
[0003] Based on this, in view of the above technical problems, it is necessary to provide a filtering circuit, a filter, a power filtering device, and an electric vehicle that can effectively reduce electromagnetic radiation.
[0004] In a first aspect, the present utility model provides a filtering circuit applied to a power filtering device of an automobile. The filtering circuit includes 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 terminal, and the second end of the first conductive component is a first power output terminal; the first end of the second conductive component is a second power input terminal, and the second end of the second conductive component is a second power output terminal; 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 filtering circuit further includes:
[0005] A plurality of common-mode capacitors, one end of the common-mode capacitor is connected to the first conductive component or the second conductive component, and the other end of the common-mode capacitor is 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;
[0006] 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; wherein, at least one of the differential-mode capacitors is connected between the first power input terminal and the second power input terminal, and at least one of the differential-mode capacitors is connected between the first power output terminal and the second power output terminal.
[0007] In one embodiment, the multiple common-mode capacitors are respectively a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, and a sixth capacitor; wherein, one end of the first capacitor is connected to the first power input terminal, and the other end of the first capacitor is grounded; one end of the second capacitor is connected to the second power input terminal, and the other end of the second capacitor is grounded; the connection point of the third capacitor and the first conductive component is located between the connection point of the first capacitor and the first conductive component and the first magnetic ring; the connection point of the fourth capacitor and the second conductive component is located between the connection point of the second capacitor and the second conductive component and the first magnetic ring; the connection point of the fifth capacitor and the first conductive component is located between the first magnetic ring and the second magnetic ring; the connection point of the sixth capacitor and the second conductive component is located between the first magnetic ring and the second magnetic ring.
[0008] In one embodiment, the multiple differential-mode capacitors are respectively a seventh capacitor, an eighth capacitor, a ninth capacitor, and a tenth capacitor; wherein, one end of the seventh capacitor is connected to the first power input terminal, and the other end of the seventh capacitor is connected to the second power input terminal; one end of the eighth capacitor is connected to one end of the fifth capacitor, and the other end of the eighth capacitor is connected to one end of the sixth capacitor; one ends of the ninth capacitor and the tenth capacitor are connected to the output terminal of the first power supply, and the other ends of the ninth capacitor and the tenth capacitor are connected to the output terminal of the second power supply.
[0009] In one embodiment, the seventh capacitor is used to filter differential-mode interference in the frequency band of 20 MHz to 30 MHz, the eighth capacitor is used to filter differential-mode interference in the frequency band of 150 kHz to 500 kHz, and the ninth capacitor and the tenth capacitor are configured to filter differential-mode interference in the frequency band of 30 MHz to 60 MHz.
[0010] In a second aspect, the present utility model provides a filter, comprising: an insulating housing, a positive copper bar, a negative copper bar, a grounding metal sheet, a first magnetic ring, and a second magnetic ring;
[0011] Among them, the positive copper busbar and the negative copper busbar are located inside the insulating housing, and both ends of the positive copper busbar and the negative copper busbar penetrate out of the insulating housing. The first end of the positive copper busbar is the first power input terminal, the second end of the positive copper busbar is the first power output terminal, the first end of the negative copper busbar is the second power input terminal, and the second end of the negative copper busbar is the second power output terminal. The first magnetic ring and the second magnetic ring are located inside the insulating housing. The first end of the positive copper busbar and the first end of the negative copper busbar pass through the first magnetic ring, and the second end of the positive copper busbar and the second end of the negative copper busbar pass through the second magnetic ring. The grounding metal sheet is located inside the insulating housing, and one end of the grounding metal sheet penetrates out of the insulating housing; The filter further includes:
[0012] A plurality of common-mode capacitors, one end of the common-mode capacitor is connected to the positive copper busbar, and the other end of the common-mode capacitor is connected to the grounding metal sheet; Among them, one end of one of the plurality of common-mode capacitors is connected to the first power input terminal, and one end of another one of the plurality of common-mode capacitors is connected to the second power input terminal;
[0013] A plurality of differential-mode capacitors, one end of the differential-mode capacitor is connected to the first end of the positive copper busbar, and the other end of the differential-mode capacitor is connected to the second end of the positive copper busbar; Among them, at least one of the differential-mode capacitors is connected between the first power input terminal and the second power input terminal, and at least two of the differential-mode capacitors are connected between the first power output terminal and the second power output terminal.
[0014] In one embodiment, the plurality of common-mode capacitors are respectively the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor and the sixth capacitor; Among them, the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor and the plurality of differential-mode capacitors are located inside 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 grounding metal sheet; One end of the second capacitor is connected to the second power input terminal, and the other end of the second capacitor is connected to the grounding metal sheet; The connection points of the first capacitor and the positive copper busbar and the connection points of the fourth capacitor and the positive copper busbar are both located between the positive copper busbar and the first magnetic ring. The connection points of the second capacitor and the negative copper busbar and the connection points of the fourth capacitor and the negative copper busbar are both located between the negative copper busbar and the first magnetic ring. The connection point of the fifth capacitor and the positive copper busbar is located between the first magnetic ring and the second magnetic ring. The connection point of the sixth capacitor and the negative copper busbar is located between the first magnetic ring and the second magnetic ring.
[0015] In one embodiment, the multiple differential-mode capacitors are respectively a seventh capacitor, an eighth capacitor, a ninth capacitor, and a tenth capacitor; wherein, one end of the seventh capacitor is connected to the first power input terminal, and the other end of the seventh capacitor is connected to the second power input terminal; one end of the eighth capacitor is connected to one end of the fifth capacitor, and the other end of the eighth capacitor is connected to one end of the sixth capacitor; one ends of the ninth capacitor and the tenth capacitor are connected to the output terminal of the first power supply, and the other ends of the ninth capacitor and the tenth capacitor are connected to the output terminal of the second power supply.
[0016] In one embodiment, the seventh capacitor is used to filter differential-mode interference in the frequency band of 20 MHz to 30 MHz, the eighth capacitor is used to filter differential-mode interference in the frequency band of 150 kHz to 500 kHz, and the ninth capacitor and the tenth capacitor are configured to filter differential-mode interference in the frequency band of 30 MHz to 60 MHz.
[0017] In a third aspect, the present utility model provides a power filtering device applied to an automobile, and the power filtering device includes the filter in the above embodiment.
[0018] In a fourth aspect, the present utility model provides an electric vehicle, including the power filtering device in the above embodiment.
[0019] This application provides a filtering circuit, a filter, a power filtering device, and an electric vehicle. The filtering circuit is provided such that one ends of multiple common-mode capacitors are connected to a first conductive component or a second conductive component, and the other ends of the common-mode capacitors are grounded, so that electromagnetic radiation generated by the power filtering device can be introduced to the ground through the first conductive component and the second conductive component via multiple common-mode capacitors, thereby performing common-mode filtering. The first ends of the first conductive component and the second conductive component pass through a first magnetic ring, and the second ends of the first conductive component and the second conductive component pass through a second magnetic ring, which can increase the impedance of the common-mode loop, reduce the current in the common-mode loop, and perform common-mode filtering; one ends of multiple differential-mode capacitors are connected to the first conductive component, and the other ends of the differential-mode capacitors are connected to the second conductive component, which can perform differential-mode filtering; by performing multiple common-mode filtering and differential-mode filtering on the electromagnetic radiation generated by the power filtering device, electromagnetic radiation can be effectively reduced. Description of the Drawings
[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0021] Figure 1Schematic diagram of the structure of the filter circuit in an embodiment;
[0022] Figure 2 Schematic diagram of the filtering principle of the filter circuit in an embodiment;
[0023] Figure 3 Schematic diagram of the test result of the electromagnetic radiation of the power filtering device without the filter circuit in an embodiment;
[0024] Figure 4 Schematic diagram of the test result of the electromagnetic radiation of the power filtering device provided with the filter circuit disclosed in the present application in an embodiment;
[0025] Figure 5 Schematic diagram of the structure of the filter in an embodiment;
[0026] Figure 6 Schematic diagram of the connection of the application scenario of the filter in an embodiment;
[0027] Figure 7 Schematic diagram of the connection relationship between the filter and external components in an embodiment. Detailed implementation manners
[0028] For ease of understanding the present application, the present application will be described more comprehensively below with reference to the relevant drawings. Embodiments of the present application are given 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, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.
[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the specification of this application herein are only for the purpose of describing specific embodiments and are not intended to limit this application.
[0030] It can be 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 the first element from another element.
[0031] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediate element. In addition, in the following embodiments, "connection", if there is a transfer of electrical signals or data between the connected objects, should be understood as "electrical connection", "communication connection", etc.
[0032] As used herein, the singular forms "a", "an" and "the" may also include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprises / comprising", "has / including", etc. specify the presence of the stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, 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 related listed items.
[0033] As Figure 1 As shown in the structural schematic diagram of the filter circuit, the present application provides a filter circuit 100, including:
[0034] A first conductive component P1, a second conductive component P2, a first magnetic ring L1 and a second magnetic ring L2; wherein, the first end of the first conductive component P1 is a first power input terminal P11, and the second end of the first conductive component P1 is a first power output terminal P12; the first end of the second conductive component P2 is a second power input terminal P21, and the second end of the second conductive component P2 is a second power output terminal P22; the first end of the first conductive component P1 and the first end of the second conductive component P2 pass through the first magnetic ring L1, and the second end of the first conductive component P1 and the second end of the second conductive component P2 pass through the second magnetic ring L2; the filter circuit further includes:
[0035] A plurality of common-mode capacitors, one end of the common-mode capacitor is connected to the first conductive component P1 or the second conductive component P2, and the other end of the common-mode capacitor is grounded; wherein, one end of one of the plurality of common-mode capacitors is connected to the first power input terminal P11, and one end of another of the plurality of common-mode capacitors is connected to the second power input terminal P21;
[0036] A plurality of differential-mode capacitors, one end of the differential-mode capacitor is connected to the first conductive component P1, and the other end of the differential-mode capacitor is connected to the second conductive component P2; wherein, at least one differential-mode capacitor is connected between the first power input terminal P11 and the second power input terminal P21, and at least one differential-mode capacitor is connected between the first power output terminal P12 and the second power output terminal P22.
[0037] Wherein, the first conductive component P1 can be optionally set to refer to a positive high-voltage copper bar; the second conductive component P2 can be optionally set to refer to a negative high-voltage copper bar; the positive high-voltage copper bar and the negative high-voltage copper bar generally refer to conductive devices used in power transmission and distribution systems; the common-mode capacitor refers to a capacitor used for filtering or suppressing common-mode signals (equal voltages acting on two ports simultaneously); the differential-mode capacitor refers to a capacitor used for filtering or suppressing differential-mode signals (different voltages acting on two ports simultaneously).
[0038] Specifically, the positive high-voltage copper busbar refers to a copper conductive wire with a high positive voltage, and the negative high-voltage copper busbar refers to a copper conductive wire with a high negative voltage. They are usually used to connect equipment such as high-voltage power supplies, substations, and power transformers, and are responsible for transporting and distributing electrical energy. They are usually made of high-quality copper materials, or other metal materials with good electrical conductivity and corrosion resistance that can withstand high voltages and large currents; common-mode capacitors are usually used to reduce common-mode noise or electromagnetic interference in a circuit, and their function is to short-circuit the common-mode signal to ground as much as possible, so that the common-mode interference is eliminated or reduced; differential-mode capacitors are usually used to reduce differential-mode interference in a circuit.
[0039] In the above filter circuit 100, one end of multiple common-mode capacitors is connected to the first conductive component P1 or the second conductive component P2, and the other end of the common-mode capacitor is grounded, so that the electromagnetic radiation generated by the power filter device can be introduced into the ground through the first conductive component P1 and the second conductive component P2 via multiple common-mode capacitors, thereby performing common-mode filtering. The first ends of the first conductive component P1 and the second conductive component P2 pass through the first magnetic ring L1, and the second ends of the first conductive component P1 and the second conductive component P2 pass through the second magnetic ring L2, which can increase the impedance of the common-mode loop, reduce the current in the common-mode loop, and perform common-mode filtering; one end of multiple differential-mode capacitors is connected to the first conductive component P1, and the other end of the differential-mode capacitor is connected to the second conductive component P2 to perform differential-mode filtering; by performing multiple common-mode filtering and differential-mode filtering on the electromagnetic radiation generated by the power filter device, the electromagnetic radiation can be effectively reduced.
[0040] In one embodiment, as Figure 1As shown, multiple common-mode capacitors can be selectively set as the first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, and the sixth capacitor C6 respectively; among them, 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 second capacitor C2 is connected to the second power input terminal P21, and the other end of the second capacitor C2 is grounded; the connection point of the third capacitor C3 and the first conductive component P1 is located between the connection point of the first capacitor C1 and the first conductive component P1 and the first magnetic ring L1; the connection point of the fourth capacitor C4 and the second conductive component P2 is located between the connection point of the second capacitor C2 and the second conductive component P2 and the first magnetic ring L1; the connection point of the fifth capacitor C5 and the first conductive component P1 is located between the first magnetic ring L1 and the second magnetic ring L2; the connection point of the sixth capacitor C6 and the second conductive component P2 is located between the first magnetic ring L1 and the second magnetic ring L2; multiple differential-mode capacitors can be selectively set as the seventh capacitor C7, the eighth capacitor C8, the ninth capacitor C9, and the tenth capacitor C10 respectively; among them, one end of the seventh capacitor C7 is connected to the first power input terminal P11, and the other end of the seventh capacitor C7 is connected to the second power input terminal P21; one end of the eighth capacitor C8 is connected to one end of the fifth capacitor C5, and the other end of the eighth capacitor C8 is connected to one end of the sixth capacitor C6; one ends of the ninth capacitor C9 and the tenth capacitor C10 are connected to the output terminal of the first power supply, and the other ends of the ninth capacitor C9 and the tenth capacitor C10 are connected to the output terminal of the second power supply.
[0041] Among them, in combination with Figure 1 the structural schematic diagram of the filter circuit, as Figure 2 shown in the schematic diagram of the filtering principle of the filter circuit, the filtering principle of the filter circuit is described as follows: the first capacitor C1 and the second capacitor C2 constitute the first-stage common-mode filtering module, the third capacitor C3 and the fourth capacitor C4 constitute the second-stage common-mode filtering module, the first magnetic ring L1 is the third-stage common-mode filtering module, the fifth capacitor C5 and the sixth capacitor C6 constitute the fourth-stage common-mode filtering module, and the second magnetic ring L2 is the fifth-stage common-mode filtering module; the seventh capacitor C7 is the first-stage differential-mode filtering module, the eighth capacitor C8 is the second-stage differential-mode filtering module, and the ninth capacitor C9 and the tenth capacitor C10 constitute the third-stage differential-mode filtering module.
[0042] Specifically, the electromagnetic radiation generated by the inverter module of the power filtering device, i.e., the electromagnetic interference source, is first attenuated under the action of the first-stage common-mode filtering module, namely the first capacitor C1 and the second capacitor C2, then attenuated under the action of the first-stage differential-mode filtering module, namely the seventh capacitor C7, then attenuated under the action of the second-stage common-mode filtering module, namely the third capacitor C3 and the fourth capacitor C4, then attenuated under the action of the third-stage common-mode filtering module, namely the first magnetic ring L1, then attenuated under the action of the second-stage differential-mode filtering module, namely the eighth capacitor C8, then attenuated under the action of the fourth-stage common-mode filtering module, namely the fifth capacitor C5 and the sixth capacitor C6, then attenuated under the action of the fifth-stage common-mode filtering module, namely the second magnetic ring L2, and finally attenuated under the action of the third-stage differential-mode filtering module, namely the ninth capacitor C9 and the tenth capacitor C10.
[0043] Through the above embodiments, after five times of common-mode filtering and three times of differential-mode filtering, the common-mode signals in the circuit can be filtered out, and through reasonable arrangement and connection, the influence of electromagnetic interference can be effectively reduced, ensuring the normal operation of the circuit.
[0044] Furthermore, in one embodiment, the seventh capacitor C7 is used to filter out differential-mode interference in the frequency band of 20 MHz to 30 MHz, the eighth capacitor C8 is used to filter out differential-mode interference in the frequency band of 150 kHz to 500 kHz, and the ninth capacitor C9 and the tenth capacitor C10 are configured to filter out differential-mode interference in the frequency band of 30 MHz to 60 MHz.
[0045] Specifically, as Figure 3 the schematic diagram of the test results of the electromagnetic radiation of the power filtering device without a filtering circuit and Figure 4 the schematic diagram of the test results of the electromagnetic radiation of the power filtering device provided with the filtering circuit disclosed in the present application show that the abscissa is the frequency, with the unit of Hz, and the ordinate is the conducted emission value, with the unit of dBuV; Figure 3 in which F1 is the peak curve and F2 is the average curve, Figure 4 in which F3 is the peak curve and F4 is the average curve; through Figure 3 and Figure 4 it can be seen that after the filtering circuit disclosed in the present application is set in the power filtering system, the electromagnetic radiation can be well suppressed, enabling the power filtering system to meet the Class 3 level of the GB / T 18655-2018 standard.
[0046] In one embodiment, as Figure 5Schematic diagram of the structure of the shown filter, a filter is proposed, which is applied to the power filtering device of an automobile, and includes an insulating housing, a positive copper busbar P1, a negative copper busbar P2, grounding metal sheets G1, G2, a first magnetic ring L1 and a second magnetic ring L2; wherein, the positive copper busbar P1 and the negative copper busbar P2 are located inside the insulating housing, and both ends of the positive copper busbar P1 and the negative copper busbar P2 penetrate out of the insulating housing. The first end of the positive copper busbar P1 is the first power input terminal P11, the second end of the positive copper busbar P1 is the first power output terminal P12, the first end of the negative copper busbar P2 is the second power input terminal P21, and the second end of the negative copper busbar P2 is the second power output terminal P22. The first magnetic ring L1 and the second magnetic ring L2 are located inside the insulating housing. The first end of the positive copper busbar P1 and the first end of the negative copper busbar P2 pass through the first magnetic ring L1, and the second end of the positive copper busbar P1 and the second end of the negative copper busbar P2 pass through the second magnetic ring L2. The grounding metal sheets G1, G2 are located inside the insulating housing, and one end of the grounding metal sheets G1, G2 penetrates out of the insulating housing; the filter further includes: a plurality of common-mode capacitors, one end of the common-mode capacitor is connected to the positive copper busbar P1, and the other end of the common-mode capacitor is connected to the grounding metal sheet; wherein, one end of one of the plurality of common-mode capacitors is connected to the first power input terminal P11, and one end of another of the plurality of common-mode capacitors is connected to the second power input terminal P21; a plurality of differential-mode capacitors, one end of the differential-mode capacitor is connected to the first end of the positive copper busbar P1, and the other end of the differential-mode capacitor is connected to the second end of the positive copper busbar P1; wherein, at least one differential-mode capacitor is connected between the first power input terminal P11 and the second power input terminal P21, and at least two differential-mode capacitors are connected between the first power output terminal P12 and the second power output terminal P22.
[0047] Wherein, the insulating housing can be made by injection molding process; the first magnetic ring L1 and the second magnetic ring L2 can be made of manganese-zinc ferrite, manganese-zinc ferrite or amorphous material; the positive copper busbar P1, the negative copper busbar P2 and the grounding metal sheet can be made of copper material; at the positions where the positive copper busbar P1, the negative copper busbar P2 and the grounding metal sheet penetrate out of the insulating housing, a polymer resin insulating material is used for fixation to ensure stability. Installation holes are opened on the outside of the insulating housing, and the filter can be installed inside the casing of the power filtering device through metal screws.
[0048] Specifically, the inverter module in the power filtering device usually includes multiple IGBTs (Insulated Gate Bipolar Transistors), which are connected to the first power input terminal P11. The main function of the inverter module is to convert the DC power supply into an AC power supply. By controlling the on and off states of the IGBTs, the conversion from DC power supply to AC power supply is achieved. During the high-speed turn-on and turn-off processes of the IGBTs, radio frequency interference is generated. Part of the radio frequency interference propagates from the inverter module to the DC power supply end, which will have an adverse impact on other electronic components. In implementation, the first end of the high-voltage copper bar is used as the first power input terminal P11 of the filtering circuit and is connected to the output end of the inverter module in the power filtering device. Through the action of the filtering circuit, the electromagnetic radiation of the power filtering system is reduced.
[0049] In one embodiment, the multiple common-mode capacitors of the filter are respectively the first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, and the sixth capacitor C6. Among them, the first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6, and the multiple 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 grounding metal sheet. One end of the second capacitor C2 is connected to the second power input terminal P21, and the other end of the second capacitor C2 is connected to the grounding metal sheet. The connection points of the first capacitor C1 with the positive copper bar P1 and the fourth capacitor C4 with the positive copper bar P1 are both located between the positive copper bar P1 and the first magnetic ring L1. The connection points of the second capacitor C2 with the negative copper bar P2 and the fourth capacitor C4 with the negative copper bar P2 are both located between the negative copper bar P2 and the first magnetic ring L1. The connection point of the fifth capacitor C5 with the positive copper bar P1 is located between the first magnetic ring L1 and the second magnetic ring L2. The connection point of the sixth capacitor C6 with the negative copper bar P2 is located between the first magnetic ring L1 and the second magnetic ring L2. The multiple differential-mode capacitors are respectively the seventh capacitor C7, the eighth capacitor C8, the ninth capacitor C9, and the tenth capacitor C10. Among them, one end of the seventh capacitor C7 is connected to the first power input terminal P11, and the other end of the seventh capacitor C7 is connected to the second power input terminal P21. One end of the eighth capacitor C8 is connected to one end of the fifth capacitor C5, and the other end of the eighth capacitor C8 is connected to one end of the sixth capacitor C6. One ends of the ninth capacitor C9 and the tenth capacitor C10 are connected to the output end of the first power supply, and the other ends of the ninth capacitor C9 and the tenth capacitor C10 are connected to the output end of the second power supply.
[0050] Furthermore, in one embodiment, a power filtering device is provided, which is applied to an automobile. The power filtering device includes the filter in each of the above embodiments.
[0051] In one embodiment, an electric vehicle is provided, including the power filtering device in the above embodiment.
[0052] Further, in one embodiment, in combination with the schematic diagram of the application scenario connection of the filter as shown in Figure 6 and the schematic diagram of the connection relationship between the filter and external components as shown in Figure 7 it can be seen that the battery pack 10 is connected to the power output terminal of the filtering circuit corresponding to the filter. Among them, the power output terminal includes a first power output terminal P12 and a second power output terminal P22. The first end 21 of the DClink20 is connected to the power input terminal of the filtering circuit corresponding to the filter. Among them, the power input terminal includes a first power input terminal P11 and a second power input terminal P21. And the second end 22 of the DClink20 is connected to the power module 30, and the power module 30 is connected to the motor 40; furthermore, it also includes a chassis ground 50 connected to the common mode capacitor.
[0053] Among them, the DClink20 can be a support capacitor, which is used to ensure the stability and reliability of power transmission in the application scenario of the filter as shown in Figure 6 ; the chassis ground 50 is used to provide a stable ground for the filter; the motor 40 can be a drive motor or a generator.
[0054] Specifically, the power module 30 is used to rectify and regulate the current output by the motor 40, and then transmit the electric energy to the filter through the DClink20. After the electric energy is filtered by the filter, a stable DC current is obtained and finally transmitted to the battery pack 10.
[0055] Through the above embodiments, electromagnetic interference (EMI) generated in new energy vehicles can be effectively suppressed, ensuring the normal operation of each electronic system in the vehicle; the direct current rectified from the generator in new energy vehicles may contain unstable factors such as ripples and harmonics. Through the improvement of the filter in this application, unstable factors can be filtered out, improving the power quality, and ensuring that high-voltage electrical equipment such as motor controllers and battery packs obtain stable and pure power supply; and the high-voltage filter also helps new energy vehicles meet relevant electromagnetic compatibility and electrical safety requirements, ensuring that the vehicle can be legally used.
[0056] In the description of this specification, the description with reference to terms such as "some embodiments", "other embodiments", "ideal embodiments", etc. means that the specific features, structures, materials or features described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.
[0057] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.
[0058] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.
Claims
1. A filter circuit, characterized in that: A power filtering device for an automobile, wherein 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 being connected to the first conductive component, and the other end of each differential mode capacitor being 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, and at least one of the differential mode capacitors is connected between the first power output terminal and the second power output terminal.
2. The filter circuit according to claim 1, characterized in that: The plurality of common-mode capacitors are respectively a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor and a sixth capacitor; Wherein, one end of the first capacitor is connected to the first power input terminal, and the other end of the first capacitor is grounded; one end of the second capacitor is connected to the second power input terminal, and the other end of the second capacitor is grounded; The connection point between the third capacitor and the first conductive component is located between the connection point between the first capacitor and the first conductive component and the first magnetic ring, and the connection point between the fourth capacitor and the second conductive component is located between the connection point between the second capacitor and the second conductive component and the first magnetic ring; A connection point between the fifth capacitor and the first conductive component is located between the first magnetic ring and the second magnetic ring, and a connection point between the sixth capacitor and the second conductive component is located 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 seventh capacitor, an eighth capacitor, a ninth capacitor and a tenth capacitor; Wherein, one end of the seventh capacitor is connected to the first power input terminal, and the other end of the seventh capacitor is connected to the second power input terminal; One end of the eighth capacitor is connected to one end of the fifth capacitor, and the other end of the eighth capacitor is connected to one end of the sixth capacitor; One end of the ninth capacitor and the tenth capacitor is connected to the output end of the first power supply, and the other end of the ninth capacitor and the tenth capacitor is connected to the output end of the second power supply.
4. The filter circuit according to claim 3, characterized in that: The seventh capacitor is used to filter out differential mode interference in the frequency band of 20MHz to 30MHz, the eighth capacitor is used to filter out differential mode interference in the frequency band of 150kHz to 500kHz, and the ninth capacitor and the tenth capacitor are configured to filter out differential mode interference in the frequency band of 30MHz to 60MHz.
5. A filter, characterized in that: A power filter device applied to an automobile, the filter comprising an insulating housing, a positive copper bar, a negative copper bar, a grounding metal sheet, a first magnetic ring and a second magnetic ring; Wherein, the positive copper bar and the negative copper bar are located in the insulating shell, and both ends of the positive copper bar and the negative copper bar pass through the insulating shell, the first end of the positive copper bar is the first power input end, the second end of the positive copper bar is the first power output end, the first end of the negative copper bar is the second power input end, and the second end of the negative copper bar 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 copper bar and the first end of the negative copper bar pass through the first magnetic ring, the second end of the positive copper bar and the second end of the negative copper bar pass through the second magnetic ring, the grounding metal sheet is located in the insulating shell, and one end of the grounding metal sheet 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 copper busbar, and the other end of each of the common-mode capacitors being connected to the grounding metal sheet; 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 being connected to the first end of each positive copper busbar, and the other end of each differential mode capacitor being connected to the second end of each positive copper busbar; wherein at least one of the differential mode capacitors is connected between the first power input terminal and the second power input terminal, and at least two of the differential mode capacitors are connected between the first power output terminal and the second power output terminal.
6. The filter according to claim 5, characterized in that The plurality of common-mode capacitors are respectively a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor and a sixth capacitor; Wherein, the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, the sixth 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 grounding metal sheet; one end of the second capacitor is connected to the second power input terminal, and the other end of the second capacitor is connected to the grounding metal sheet; The connection point between the first capacitor and the positive copper bar and the connection point between the fourth capacitor and the positive copper bar are both located between the positive copper bar and the first magnetic ring, the connection point between the second capacitor and the negative copper bar and the connection point between the fourth capacitor and the negative copper bar are both located between the negative copper bar and the first magnetic ring, the connection point between the fifth capacitor and the positive copper bar is located between the first magnetic ring and the second magnetic ring, and the connection point between the sixth capacitor and the negative copper bar is located between the first magnetic ring and the second magnetic ring.
7. The filter according to claim 6, characterized in that The plurality of differential mode capacitors are respectively a seventh capacitor, an eighth capacitor, a ninth capacitor and a tenth capacitor; wherein one end of the seventh capacitor is connected to the first power input terminal, and the other end of the seventh capacitor is connected to the second power input terminal; One end of the eighth capacitor is connected to one end of the fifth capacitor, and the other end of the eighth capacitor is connected to one end of the sixth capacitor; One end of the ninth capacitor and the tenth capacitor is connected to the output end of the first power supply, and the other end of the ninth capacitor and the tenth capacitor is connected to the output end of the second power supply.
8. The filter according to claim 7, characterized in that The seventh capacitor is used to filter out differential mode interference in the frequency band of 20MHz to 30MHz, the eighth capacitor is used to filter out differential mode interference in the frequency band of 150kHz to 500kHz, and the ninth capacitor and the tenth capacitor are configured to filter out differential mode interference in the frequency band of 30MHz to 60MHz.
9. A power filtering device, characterized in that: Applied to an automobile, the power filtering device comprises the filter as claimed in any one of claims 5 to 8.
10. An electric vehicle, characterized in that: Comprising the power filtering device as claimed in claim 9.