CN218733897U - EMC filter circuit, power and new forms of energy vehicle - Google Patents
EMC filter circuit, power and new forms of energy vehicle Download PDFInfo
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- CN218733897U CN218733897U CN202222958046.7U CN202222958046U CN218733897U CN 218733897 U CN218733897 U CN 218733897U CN 202222958046 U CN202222958046 U CN 202222958046U CN 218733897 U CN218733897 U CN 218733897U
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Abstract
The utility model relates to a circuit design field specifically provides an EMC filter circuit, power and new forms of energy vehicle, include: the double-line balanced filter, the differential mode filter sub-circuit and the common mode filter sub-circuit are sequentially arranged, wherein one end of the double-line balanced filter is connected with the positive electrode of the output end of a power supply, the other end of the double-line balanced filter is connected with the negative electrode of the output end of the power supply, the double-line balanced filter, the differential mode filter sub-circuit and the common mode filter sub-circuit are arranged in parallel and arranged between the positive electrode of the output end and the negative electrode of the output end, and two output ends of the common mode filter sub-circuit are respectively connected with vehicle-mounted high-voltage components. The utility model discloses in using double-line balanced filter to the electromagnetic compatibility circuit, only need dispose corresponding differential mode filtering sub-circuit and common mode filtering sub-circuit just can reduce electromagnetic interference's among the circuit influence, simplified circuit structure, processing technology is simple, greatly reduced manufacturing cost.
Description
Technical Field
The utility model relates to a circuit design technical field particularly, relates to an EMC filter circuit, power and new forms of energy vehicle.
Background
The new energy vehicle technology is a hotspot of the current automobile technology development, a plurality of vehicle-mounted high-voltage components are generally arranged on the current new energy vehicle, and the generated electromagnetic interference can not only influence the reliability of the self work, but also influence the normal operation of other peripheral components. Therefore, the EMC (Electromagnetic Compatibility) performance of the vehicle-mounted high-voltage component becomes a core technical index, wherein the EMC performance refers to the capability of the vehicle-mounted high-voltage component to operate in compliance with the requirement in the Electromagnetic environment and not generate intolerable Electromagnetic interference to any other component in the environment. At present, EMC performance is generally improved by adding an EMC filter circuit, and because the impedance characteristics of capacitors in the existing EMC filter circuit are different, it is difficult to simultaneously ensure and reduce common-mode and differential-mode interference only through the capacitors, and to filter all high-frequency band interference, a large number of devices are required, and the cost is high.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an EMC filter circuit and new forms of energy vehicle can reduce electromagnetic interference's in the circuit influence, has simplified circuit structure, and processing technology is simple, greatly reduced manufacturing cost.
The utility model provides a technical scheme:
the utility model provides an EMC filter circuit, EMC filter circuit is used for filtering the back to the on-vehicle high-pressure spare part power supply of high-voltage direct current, EMC filter circuit includes: the double-line balanced filter, the differential mode filter sub-circuit and the common mode filter sub-circuit are sequentially arranged;
one end of the double-wire balance filter is connected with the positive electrode of the output end of a power supply, the other end of the double-wire balance filter is connected with the negative electrode of the output end of the power supply, the double-wire balance filter, the differential mode filter sub-circuit and the common mode filter sub-circuit are arranged between the positive electrode of the output end and the negative electrode of the output end in parallel, the common mode filter sub-circuit is grounded, and two output ends of the common mode filter sub-circuit are respectively connected with the vehicle-mounted high-voltage component.
In one embodiment, the EMC filter circuit further includes a voltage regulator tube, the voltage regulator tube is disposed between the output terminal positive electrode and the output terminal negative electrode, and the voltage regulator tube is connected in parallel with the double-wire balance filter.
In one embodiment, the voltage regulator tube is a bidirectional voltage regulator diode.
In one embodiment, the differential-mode filtering sub-circuit includes a first capacitor, one end of the first capacitor is connected to the double-line balance filter and the common-mode filtering sub-circuit, and the other end of the first capacitor is connected to the double-line balance filter and the common-mode filtering sub-circuit.
In one embodiment, the common mode filter sub-circuit includes a first capacitor bank and a second capacitor bank, one end of the first capacitor bank is connected to the differential mode filter sub-circuit, the other end of the first capacitor bank is connected to the second capacitor bank, the other end of the second capacitor bank is connected to the differential mode filter sub-circuit, and both the first capacitor bank and the second capacitor bank are grounded.
In one embodiment, the first capacitor group includes a second capacitor, a third capacitor, a fourth capacitor and a fifth capacitor, and the second capacitor is connected in parallel with the third capacitor, the fourth capacitor and the fifth capacitor in sequence.
In an embodiment, the second capacitor bank includes a sixth capacitor, a seventh capacitor, an eighth capacitor, and a ninth capacitor, and the sixth capacitor is connected in parallel with the seventh capacitor, the eighth capacitor, and the ninth capacitor in sequence.
In one embodiment, the first capacitor bank includes a second capacitor, a third capacitor, a fourth capacitor and a fifth capacitor, and the second capacitor bank includes a sixth capacitor, a seventh capacitor, an eighth capacitor and a ninth capacitor, where the capacitance values of the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor, the seventh capacitor, the eighth capacitor and the ninth capacitor are all equal.
The utility model provides a power supply, include as above-mentioned an EMC filter circuit.
The embodiment of the utility model provides a still provide a new forms of energy vehicle, include as above-mentioned power and on-vehicle high-pressure spare part.
The utility model provides a pair of EMC filter circuit's beneficial effect is:
the utility model discloses in using double-line balanced filter to the electromagnetic compatibility circuit, only need dispose corresponding differential mode filtering sub-circuit and common mode filtering sub-circuit just can reduce electromagnetic interference's among the circuit influence, simplified circuit structure, processing technology is simple, greatly reduced manufacturing cost.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a circuit diagram of an EMC filter circuit according to an embodiment of the present invention;
fig. 2 is a block diagram of a new energy vehicle according to an embodiment of the present invention.
Description of the main element symbols:
100-EMC filter circuit, 120-differential mode filter subcircuit, 130-common mode filter subcircuit, 200-power supply, 300-vehicle high-voltage parts, ZD-bidirectional voltage regulator tube, BDL 1-double-wire balance filter, C1-first capacitor, C2-second capacitor, C3-third capacitor, C4-fourth capacitor, C5-fifth capacitor, C6-sixth capacitor, C7-seventh capacitor, C8-eighth capacitor and C9-ninth capacitor.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships that are conventionally placed when the products of the present invention are used, or orientations or positional relationships that are conventionally understood by those skilled in the art, and are merely for convenience of description of the present invention and for simplicity of description, and do not indicate or imply that the equipment or components that are referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
At present, all have a lot of on-vehicle high-voltage component parts on the new energy vehicle usually, on-vehicle high-voltage component part can produce electromagnetic interference at the in-process of work, not only can influence the reliability of self work, also can influence the normal operating of other peripheral spare parts, consequently, this application provides an EMC filter circuit, and this circuit is arranged in reducing electromagnetic interference's among the circuit influence to the structure itself of circuit is simple, thereby greatly reduced manufacturing cost.
Examples
Referring to fig. 1 and fig. 2, the embodiment provides an EMC filter circuit 100, where the EMC filter circuit 100 is configured to filter a high-voltage direct current and then supply power to a vehicle-mounted high-voltage component 300, and the EMC filter circuit 100 includes: the double-line balance filter BDL1, the differential mode filter sub-circuit 120 and the common mode filter sub-circuit 130 are sequentially arranged;
the pin a of the double-line balanced filter BDL1 is connected to the positive electrode of the output terminal of the power supply, the pin B of the double-line balanced filter BDL1 is connected to the negative electrode of the output terminal of the power supply, the pin G1 and the pin G2 of the double-line balanced filter BDL1 are respectively grounded, the double-line balanced filter BDL1, the differential mode filter sub-circuit 120 and the common mode filter sub-circuit 130 are connected in parallel and are all arranged between the positive electrode of the output terminal and the negative electrode of the output terminal, the common mode filter sub-circuit 130 is grounded, and two output terminals of the common mode filter sub-circuit 130 are respectively connected to the vehicle-mounted high-voltage component 300.
It is understood that the EMC filter circuit 100 is disposed at the high voltage dc port for performing electromagnetic compatible filtering protection on the power supply 200, and the power supply 200 in this embodiment refers to the power supply 200 with high voltage dc. Therefore, after the EMC filter circuit 100 filters the power supply 200, the filtered power supply 200 can be used for the vehicle-mounted high-voltage component 300 to operate in an electromagnetic environment in compliance with the requirements, and cannot generate intolerable electromagnetic interference to any other components in the environment.
Specifically, the dual balanced filter BDL1 is also called a BDL filter, where the pin a and the pin B of the dual balanced filter BDL1 are not conductive, the pin G1 and the pin G2 are conductive, and the resistance is 0 ohm; when the two-wire balance filter BDL1 is used in a circuit, the two-wire balance filter BDL1 belongs to a parallel device, generally, the pin A and the pin B are arranged at two ends of a signal, in this embodiment, the pin A is connected with the anode of the output end of a power supply, and the pin B is connected with the cathode of the output end of the power supply, so that when the pin A and the pin B are connected at two ends of the signal in parallel, the pin G1 and the pin G2 need to be grounded to be matched for use. In this embodiment, the G1 pin and the G2 pin are connected to a PE (Protective earth) wire, which is a commonly used ground wire that is grounded or connected to a wire with a zero reference potential in an electrical system or an electronic device, so that a leakage and electric shock accident is avoided by connecting the G1 pin and the G2 pin of the two-wire balanced filter BDL1 to the ground wire.
Specifically, the two output terminals of the common mode filter sub-circuit 130 refer to a positive terminal and a negative terminal of the output terminal of the power supply 200 after passing through the EMC filter circuit 100, and further, the two output terminals of the common mode filter sub-circuit 130 are connected to the vehicle-mounted high-voltage component 300, so that the vehicle-mounted high-voltage component 300 uses the power supply 200 after being filtered by the EMC filter circuit 100.
Therefore, the application applies the double-line balance filter BDL1 to an actual electromagnetic compatibility circuit, and according to the frequency characteristics of the application, the specific types of the capacitors in the differential mode filter sub-circuit 120 and the common mode filter sub-circuit 130 are selected, and high-frequency interference can be filtered according to the double-line balance filter BDL1 and the capacitors with different impedance characteristics, so that the EMC filter circuit 100 in the implementation can accurately select the types of the capacitors in the circuit according to the double-line balance filter BDL1, and when the high-frequency interference in the circuit is effectively eliminated, the circuit structure is simplified, the whole area of the circuit is reduced, and the applicability is stronger.
In one embodiment, the EMC filter circuit 100 further includes a voltage regulator tube, the voltage regulator tube is disposed between the positive electrode of the output terminal and the negative electrode of the output terminal, and the voltage regulator tube is connected in parallel with the two-wire balance filter BDL 1.
It can be understood that the voltage regulator tube may also be referred to as a zener diode, where the voltage regulator tube is disposed between the positive electrode of the output end of the power supply 200 and the negative electrode of the output end, forms a series circuit with the power supply 200, and may be connected in parallel with the bidirectional balanced filter BDL1 after being connected in series in the reverse direction through two zener diodes, so that the zener diode is connected in parallel in front of the bidirectional balanced filter BDL1, and may play a role of overvoltage protection for the bidirectional balanced filter BDL1, exemplarily, when a circuit is in overvoltage, the zener diode may first break down to form a short circuit, thereby protecting the bidirectional balanced filter BDL1, so as to prolong the service life of the bidirectional balanced filter BDL 1.
Further, in one embodiment, the zener diode is a bidirectional zener diode ZD, which is also called a bidirectional zener diode, and the bidirectional zener diode is a semiconductor device having a very high resistance up to a critical reverse breakdown voltage, and when the bidirectional zener diode is in reverse breakdown, the voltage at both ends is almost constant within a certain current range or a certain power loss range, thereby exhibiting a voltage stabilizing characteristic. The bidirectional voltage stabilizing diode is one of the voltage stabilizing diodes, the forward direction and the reverse direction of the bidirectional diode in the bidirectional voltage stabilizing diode have voltage stabilizing effect, and the diode is conducted reversely after a certain reverse voltage is applied to two ends by utilizing the reverse characteristic, so that the voltage stabilizing effect is achieved.
In one embodiment, the differential-mode filtering sub-circuit 120 includes a first capacitor C1, one end of the first capacitor C1 is connected to the double-line balanced filter BDL1 and the common-mode filtering sub-circuit 130, and the other end of the first capacitor C1 is connected to the double-line balanced filter BDL1 and the common-mode filtering sub-circuit 130.
Specifically, the first capacitor C1 is disposed between the double line balance filter BDL1 and the common mode filter sub-circuit 130, that is, a front stage circuit of the first capacitor C1 is the double line balance filter BDL1, a rear stage circuit of the first capacitor C1 is the common mode filter sub-circuit 130, and the first capacitor C1 is connected in parallel to the double line balance filter BDL1 and the common mode filter sub-circuit 130, respectively. Further, the first capacitor C1 belongs to a differential mode capacitor in the filter capacitor, and the differential mode interference can be effectively filtered by using the double-line balanced filter BDL1 and the differential mode capacitor.
In one embodiment, the common mode filter sub-circuit 130 includes a first capacitor bank and a second capacitor bank, one end of the first capacitor bank is connected to the differential mode filter sub-circuit 120, the other end of the first capacitor bank is connected to the second capacitor bank, the other end of the second capacitor bank is connected to the differential mode filter sub-circuit 120, and the first capacitor bank and the second capacitor bank are both grounded.
Specifically, one end of the common mode filter sub-circuit 130 is connected to the positive electrode of the output terminal, the other end of the common mode filter sub-circuit 130 is connected to the negative electrode of the output terminal, and the common mode filter sub-circuit 130 is connected in parallel with the differential mode filter sub-circuit 120 of the previous stage circuit, and the common mode filter sub-circuit 130 is composed of two capacitor sets.
Furthermore, the two capacitor banks are the first capacitor bank and the second capacitor bank respectively, the first capacitor bank and the second capacitor bank have the same circuit structure, and the first capacitor bank and the second capacitor bank are connected in series.
Specifically, in this embodiment, one end of the first capacitor bank may be connected to the positive electrode of the output terminal, the other end of the first capacitor bank may be connected to the second capacitor bank, and the other end of the second capacitor bank may be connected to the negative electrode of the output terminal; one end of the first capacitor bank may be connected to the negative electrode of the output terminal, the other end of the first capacitor bank may be connected to the second capacitor bank, and the other end of the second capacitor bank may be connected to the positive electrode of the output terminal.
In an embodiment, the first capacitor group includes a second capacitor C2, a third capacitor C3, a fourth capacitor C4, and a fifth capacitor C5, and the second capacitor C2 is connected in parallel with the third capacitor C3, the fourth capacitor C4, and the fifth capacitor C5 in sequence.
Specifically, the first capacitor group and the second capacitor group are both composed of four capacitors, where the four capacitors in the first capacitor group are respectively a second capacitor C2, a third capacitor C3, a fourth capacitor C4 and a fifth capacitor C5, where the second capacitor C2, the third capacitor C3, the fourth capacitor C4 and the fifth capacitor C5 are connected in parallel, and further, the equivalent impedance in the circuit is reduced in a manner that the four capacitors are connected in parallel, exemplarily, for example, one capacitor equivalent impedance is 4 ohms, and then, the equivalent impedance obtained after the four capacitors are connected in parallel is 1 ohm.
In an embodiment, the second capacitor bank includes a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, and a ninth capacitor C9, and the sixth capacitor C6 is connected in parallel with the seventh capacitor C7, the eighth capacitor C8, and the ninth capacitor C9 in sequence.
The circuit structures and principles of the first capacitor group and the second capacitor group are the same, so that the first capacitor group is generally provided with four capacitors which are connected in parallel, and the second capacitor group is correspondingly provided with four capacitors which are connected in parallel. Optionally, the number of the capacitors in the first capacitor bank and the second capacitor bank may be four or five, and the specific number and value of the capacitors may be set according to actual use conditions, and the like, which is not limited herein.
Further, each capacitor in the first capacitor bank and the second capacitor bank belongs to a common-mode capacitor in the filter capacitor, and common-mode interference can be effectively filtered by using the double-line balanced filter BDL1 and the common-mode capacitor.
Furthermore, the double-wire balance filter BDL1 can select a type of the common-mode capacitance, because the frequency band of the double-wire balance filter BDL1 is relatively wide, and each capacitance has a parasitic parameter, therefore, according to the relationship between each frequency and the insertion loss of the double-wire balance filter BDL1, the frequency band when the insertion loss is at the maximum value can be determined, so as to select a capacitance with a higher resonance frequency, and then the impedance of the capacitance at the resonance frequency point is lower, so that the common-mode interference can go away through a loop with a lower impedance, so that the EMC filter circuit 100 can filter out the high-frequency interference, and reduce the interference generated by other external circuits or other components. Meanwhile, a plurality of capacitors with the same capacitance value are connected in parallel, so that the equivalent impedance of the capacitor bank can be reduced, and the filtering effect is better.
In an embodiment, the first capacitor bank includes a second capacitor C2, a third capacitor C3, a fourth capacitor C4, and a fifth capacitor C5, and the second capacitor bank includes a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, and a ninth capacitor C9, where capacitance values of the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8, and the ninth capacitor C9 are all equal.
Specifically, the capacitance values of the capacitors in the first capacitor bank and the second capacitor bank are the same, the circuit design is simpler, and the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8 and the ninth capacitor C9 are all manufactured by a conventional process, so that the reliability is ensured, and the hardware cost is reduced.
An embodiment of the utility model provides a power supply, include according to above-mentioned embodiment EMC filter circuit 100.
Specifically, the power supply 200 in this embodiment refers to a power supply with high voltage direct current, and the power supply 200 outputs high voltage direct current for the vehicle-mounted high voltage component 300 to use, so that the EMC filter circuit 100 as described in the above embodiment is disposed in the power supply 200, and differential mode interference and common mode interference in the power supply 200 can be effectively filtered, so that the power supply 200 can not generate intolerable electromagnetic interference to any other component in its environment when used by the vehicle-mounted high voltage component 300.
Referring to fig. 2, the embodiment of the present invention further provides a new energy vehicle, including the power supply 200 and the vehicle-mounted high-voltage component 300 according to the above embodiment.
Specifically, the EMC filter circuit described in the above embodiment is disposed at the port of the power supply 200, and the voltage output through the EMC filter circuit 100 is provided for the vehicle-mounted high-voltage component 300.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An EMC filter circuit, wherein the EMC filter circuit is used for filtering high voltage direct current and supplying power to vehicle-mounted high voltage components, and the EMC filter circuit comprises: the double-line balance filter, the differential mode filter sub-circuit and the common mode filter sub-circuit are sequentially arranged;
one end of the double-line balance filter is connected with the positive electrode of the output end of a power supply, the other end of the double-line balance filter is connected with the negative electrode of the output end of the power supply, the double-line balance filter, the differential mode filter sub-circuit and the common mode filter sub-circuit are arranged between the positive electrode of the output end and the negative electrode of the output end in parallel, the common mode filter sub-circuit is grounded, and the two output ends of the common mode filter sub-circuit are respectively connected with the vehicle-mounted high-voltage components.
2. The EMC filter circuit of claim 1, further comprising a voltage regulator tube disposed between the output terminal positive electrode and the output terminal negative electrode, the voltage regulator tube connected in parallel with the two-wire balance filter.
3. The EMC filter circuit of claim 2, wherein the regulator tube is a bidirectional zener diode.
4. The EMC filter circuit of claim 1, wherein the differential mode filter sub-circuit comprises a first capacitor having one end connected to the two-wire balanced filter and the common mode filter sub-circuit, respectively, and another end connected to the two-wire balanced filter and the common mode filter sub-circuit, respectively.
5. The EMC filter circuit of claim 1, wherein the common mode filter sub-circuit comprises a first capacitor bank and a second capacitor bank, one end of the first capacitor bank is connected to the differential mode filter sub-circuit, the other end of the first capacitor bank is connected to the second capacitor bank, the other end of the second capacitor bank is connected to the differential mode filter sub-circuit, and the first capacitor bank and the second capacitor bank are both grounded.
6. The EMC filter circuit of claim 5, wherein the first capacitance group includes a second capacitance, a third capacitance, a fourth capacitance, and a fifth capacitance, the second capacitance being in parallel with the third capacitance, the fourth capacitance, and the fifth capacitance in that order.
7. The EMC filter circuit of claim 5, wherein the second capacitance bank includes a sixth capacitance, a seventh capacitance, an eighth capacitance, and a ninth capacitance, the sixth capacitance being connected in parallel with the seventh capacitance, the eighth capacitance, and the ninth capacitance in sequence.
8. The EMC filter circuit of claim 5, wherein the first capacitance group includes a second capacitance, a third capacitance, a fourth capacitance, and a fifth capacitance, and the second capacitance group includes a sixth capacitance, a seventh capacitance, an eighth capacitance, and a ninth capacitance, wherein the second capacitance, the third capacitance, the fourth capacitance, the fifth capacitance, the sixth capacitance, the seventh capacitance, the eighth capacitance, and the ninth capacitance are all equal in capacitance value.
9. A power supply comprising an EMC filter circuit as claimed in any one of claims 1 to 8.
10. A new energy vehicle comprising a power supply and on-board high voltage components as claimed in claim 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222958046.7U CN218733897U (en) | 2022-11-04 | 2022-11-04 | EMC filter circuit, power and new forms of energy vehicle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222958046.7U CN218733897U (en) | 2022-11-04 | 2022-11-04 | EMC filter circuit, power and new forms of energy vehicle |
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| CN218733897U true CN218733897U (en) | 2023-03-24 |
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| CN202222958046.7U Active CN218733897U (en) | 2022-11-04 | 2022-11-04 | EMC filter circuit, power and new forms of energy vehicle |
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