CN215186461U - Filter circuit for direct current power port of new energy automobile - Google Patents
Filter circuit for direct current power port of new energy automobile Download PDFInfo
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- CN215186461U CN215186461U CN202121139549.0U CN202121139549U CN215186461U CN 215186461 U CN215186461 U CN 215186461U CN 202121139549 U CN202121139549 U CN 202121139549U CN 215186461 U CN215186461 U CN 215186461U
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Abstract
The utility model provides a filter circuit for new energy automobile direct current power port belongs to car technical field. It has solved the current problem that has electromagnetic noise filtering effect not good. This a filter circuit for new energy automobile direct current power supply port is including being used for connecting the anodal positive copper bar of high voltage direct current generating line, a negative pole copper bar for connecting the high voltage direct current generating line negative pole, first order common mode inductance L1, differential mode filtering module, second level common mode inductance L2, common differential mode capacitance group and the common mode capacitance group of compriseing Y electric capacity that comprises X electric capacity and Y electric capacity, positive negative input end of first order common mode inductance L1 corresponds respectively and connects anodal copper bar and negative pole copper bar, differential mode filtering module, common differential mode capacitance group, second level common mode inductance L2 and common mode capacitance group are connected gradually to first order common mode inductance L1's positive negative output. The utility model discloses can improve the filtering effect of high voltage direct current power end noise.
Description
Technical Field
The utility model belongs to the technical field of the car, a filter circuit for new energy automobile direct current power port is related to.
Background
With the vigorous development of the new energy automobile industry, electromotion, intelligent driving and vehicle networking become new hotspots. Meanwhile, the new energy automobile has more and more electronic devices and more power supplies, so that a plurality of high-power switching devices are applied, and the switching devices generate abundant harmonic component interference noise in the switching process, so that the electromagnetic environment in the automobile becomes worse, and the normal work of various control systems, weak current loops and radio communication represented by a PEPS (passive optical switch) system, an intelligent driving system and the like on the automobile is seriously influenced.
In order to reduce the above-mentioned influence, a filter (electromagnetic compatibility filter) needs to be arranged in a circuit of the high-voltage direct current device, and is arranged at a high-voltage direct current port to filter the high-voltage direct current and supply power, the front end of the filter is used for accessing the high-voltage direct current, and the rear end of the filter is used for connecting other devices in an internal circuit of the high-voltage direct current device.
The filter used in the existing new energy automobile is a primary LC filtering mode, namely a common mode inductor and a group of capacitors are arranged, and the group of capacitors comprises an X capacitor for eliminating differential mode interference and a Y capacitor for eliminating common mode interference. The common-mode inductor, the X capacitor and the Y power supply are matched for filtering, and electromagnetic radiation of high-voltage direct current is eliminated.
Although the existing filter can carry out filtering, only one-stage filtering is needed, the filtering bandwidth is narrow, and the whole vehicle has the problem from the kHz level to the hundred MHz level, so that a good filtering effect is difficult to achieve.
Disclosure of Invention
The utility model aims at the above-mentioned problem that prior art exists, provide a filter circuit for new energy automobile direct current power port, its technical problem that solves is: how to improve the filtering effect of the noise of the high-voltage direct current power supply end.
The purpose of the utility model can be realized by the following technical proposal: the utility model provides a filter circuit for new energy automobile direct current power port, is including being used for connecting the anodal positive copper bar of high voltage direct current bus and being used for connecting the negative pole copper bar of high voltage direct current bus negative pole, still includes first order common mode inductance L1, differential mode filter module, second level common mode inductance L2, by the common mode capacitance group that X electric capacity and Y electric capacity are constituteed and by the common mode capacitance group that Y electric capacity is constituteed, positive copper bar and negative pole copper bar are connected to first order common mode inductance L1's positive negative input end correspondence respectively, differential mode filter module is connected to first order common mode inductance L1's positive and negative output, differential mode filter module is connected with second level common mode inductance L2's input through common differential mode capacitance group, common mode capacitance group is connected to second level common mode inductance L2's output.
The filter circuit for the direct-current power supply port of the new energy automobile is connected with the positive electrode and the negative electrode of the high-voltage direct-current bus of the automobile through the positive electrode copper bar and the negative electrode copper bar, and is used for filtering high-voltage direct current and then sending the filtered high-voltage direct current into the high-power switch device, so that the problem of electromagnetic interference caused by the use of the high-power switch device of the new energy automobile is solved. When the filter circuit is used for high-voltage direct current filtering, high-voltage direct current firstly passes through a first-stage common-mode inductor L1, common-mode electromagnetic noise in a high-voltage direct current bus is filtered through a first-stage common-mode inductor L1, the common-mode electromagnetic noise passes through a differential-mode filtering module after the common-mode filtering is performed, differential-mode electromagnetic noise in the high-voltage direct current bus is filtered through a differential-mode filtering module, differential-mode and common-mode electromagnetic noise in the high-voltage direct current bus is subjected to combined filtering through a common-mode capacitor bank, and finally the common-mode electromagnetic noise in the high-voltage direct current bus is filtered again through a second-stage common-mode inductor L2 and the common-mode capacitor bank in sequence. The filter circuit forms a complete filter circuit by combining a plurality of filter measures such as a common-mode inductor, a differential-mode filter module, a common-differential-mode capacitor bank and the like, can effectively suppress electromagnetic noise generated in a high-voltage direct-current power supply, has a better switching noise filtering effect, and greatly reduces the interference influence on other devices of a vehicle.
In the filter circuit for the new energy automobile direct current power supply port, the differential mode filter module includes a differential mode inductor L3 and a differential mode inductor L4, one end of the differential mode inductor L3 is connected to a positive output end of a first-stage common mode inductor L1, one end of the differential mode inductor L4 is connected to a negative output end of the first-stage common mode inductor L1, and the other end of the differential mode inductor L3 and the other end of the differential mode inductor L4 are respectively connected to a common-differential mode capacitor bank. Through two the same differential mode inductance L3 and L4, can carry out effective filtering to the differential mode electromagnetic noise in the high voltage direct current generating line, eliminate the electromagnetic noise that the differential mode component brought in the circuit for this filter circuit filtering effect is better.
In the filter circuit for the new energy automobile dc power supply port, the common-differential mode capacitor group includes an X capacitor C1, a Y capacitor C2, a Y capacitor C3, a Y capacitor C4, and a Y capacitor C5, two ends of the X capacitor C1 are respectively connected to a differential mode inductor L3 and a differential mode inductor L4, one end of the Y capacitor C2 and the Y capacitor C3 after being connected in parallel is respectively connected to one end of an X capacitor C1 and one input end of a second-stage common mode inductor L2, the other end of the Y capacitor C2 and the other end of the Y capacitor C3 after being connected in parallel is grounded, one end of the Y capacitor C4 and the Y capacitor C5 after being connected in parallel is respectively connected to the other end of an X capacitor C1 and the other input end of a second-stage common mode inductor L2, and the other end of the Y capacitor C4 and the Y capacitor C5 after being connected in parallel is grounded. A common-differential mode capacitor group consisting of the X capacitor C1 and the Y capacitors C2, C3, C4 and C5 can carry out combined filtering on differential mode and common mode electromagnetic noise in the high-voltage direct-current bus, and the filtering effect is good.
In the filter circuit for the new energy automobile dc power supply port, the common mode capacitor bank includes a Y capacitor C6 and a Y capacitor C7, one end of the Y capacitor C6 is connected to an output end of the second stage common mode inductor L2, the other end of the Y capacitor C6 is grounded, one end of the Y capacitor C7 is connected to another output end of the second stage common mode inductor L2, and the other end of the Y capacitor C7 is grounded. The common-mode capacitor bank consisting of the Y capacitors C6 and C7 realizes effective filtering of common-mode electromagnetic noise in the high-voltage direct-current bus.
In the filter circuit for the new energy automobile direct current power supply port, the common mode capacitor bank further comprises a Y capacitor C8 and a Y capacitor C9, the Y capacitor C8 is connected with the Y capacitor C6 in parallel, and the Y capacitor C9 is connected with the Y capacitor C7 in parallel. The Y capacitors C8 and C9 can further improve the effect of filtering common mode electromagnetic noise in the high-voltage direct current bus.
In the filter circuit for the new energy automobile direct current power supply port, the filter circuit further comprises an X capacitor C10, one end of the X capacitor C10 is connected with one end of the Y capacitor C6, and the other end of the X capacitor C10 is connected with one end of the Y capacitor C7. The application of the X capacitor C10 can further filter the electromagnetic noise caused by the differential mode component in the circuit, and improve the filtering effect of the noise in the circuit.
Compared with the prior art, the filter circuit for the new energy automobile direct current power supply port forms a complete filter circuit through combination of multiple filter measures such as a common-mode inductor, a differential-mode inductor, an X capacitor and a Y capacitor, and can effectively inhibit electromagnetic noise caused by differential-mode and common-mode components, so that the high voltage direct current power supply port achieves a very good filter effect, does not generate electromagnetic interference on the high voltage direct current power supply port and surrounding electrical components, and provides a good electromagnetic environment for the interior of a new energy automobile.
Drawings
Fig. 1 is a schematic circuit diagram according to a first embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of a second embodiment of the present invention.
In the figure, 1, a differential mode filtering module; 2. a common-differential mode capacitor bank; 3. a common mode capacitor bank; 4. a positive copper bar; 5. and a negative electrode copper bar.
Detailed Description
The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
The first embodiment is as follows:
as shown in fig. 1, the filter circuit for the dc power port of the new energy vehicle includes a positive copper bar 4 for connecting the positive electrode of the high voltage dc bus, a negative copper bar 5 for connecting the negative electrode of the high voltage dc bus, a first-stage common mode inductor L1, a second-stage common mode inductor L2, a differential mode filter module 1 composed of a differential mode inductor L3 and a differential mode inductor L4, a common mode capacitor group 3 composed of an X capacitor C1, a Y capacitor C2, a Y capacitor C3, a Y capacitor C4 and a Y capacitor C5, and a common mode capacitor group 3 composed of a Y capacitor C6, a Y capacitor C7, a Y capacitor C8 and a Y capacitor C9, where the first-stage common mode inductor L1 and the second-stage common mode inductor L2 each include two input ends and two output ends, where the positive input end of the first-stage common mode inductor L1 is connected to the positive copper bar 4, the negative input end of the first-stage common mode inductor L1 is connected to the negative copper bar 5, and the positive output end of the first-stage common mode inductor L1 is connected to the differential mode filter module 3, the negative output end of the first-stage common mode inductor L1 is connected to one end of a differential mode inductor L4 in the differential mode filter module 1, the differential mode filter module 1 is connected to the common differential mode capacitor bank 2, specifically, the other end of a differential mode inductor L3 in the differential mode filter module 1 is respectively connected to one end of an X capacitor C1, one end of a Y capacitor C2 and one end of a Y capacitor C3 in the common differential mode capacitor bank 2, the other end of the differential mode inductor L4 is respectively connected to the other end of the X capacitor C1, one end of the Y capacitor C4 and one end of a Y capacitor C5, the other end of the Y capacitor C2 is connected to the ground after being connected to the other end of the Y capacitor C3, the other end of the Y capacitor C4 is connected to the other end of the Y capacitor C5 to the ground, and the ground can be a ground plane, a cabinet or an outer shell.
After the common-differential mode capacitor group 2 is connected, a second-stage common-mode inductor L2 is connected, wherein one input end of a second-stage common-mode inductor L2 is connected with the other end of a differential-mode inductor L3, the other input end of the second-stage common-mode inductor L2 is connected with the other end of a differential-mode inductor L4, one output end of a second-stage common-mode inductor L2 is respectively connected with a Y capacitor C6 and a Y capacitor C8 in the common-mode capacitor group 3, the other output end of the second-stage common-mode inductor L2 is respectively connected with a Y capacitor C7 and a Y capacitor C9 in the common-mode capacitor group 3, the Y capacitor C6 and the Y capacitor C8 are connected and then grounded, and the Y capacitor C7 and the Y capacitor C9 are connected and then grounded.
This a filter circuit for new energy automobile direct current power supply port's theory of operation: the anode copper bar 4 and the cathode copper bar 5 of the utility model are respectively connected with the anode and the cathode of the high voltage direct current bus of the vehicle, is used for transmitting high-voltage direct current through the anode copper bar 4 and the cathode copper bar 5, the high-voltage direct current firstly passes through the first-stage common-mode inductor L1 after being electrified, common mode electromagnetic noise in the high-voltage direct current bus is filtered for the first time through a first-stage common mode inductor L1, differential mode electromagnetic noise in the high-voltage direct current bus is filtered for the first time through a differential mode inductor L3 and a differential mode inductor L4 after the common mode filtering for the first time, then the common mode electromagnetic noise passes through a high-low frequency combined filter circuit formed by an X capacitor C1, a Y capacitor C2 and a Y capacitor C3 and a high-low frequency combined filter circuit formed by a Y capacitor C4 and a Y capacitor C5, performing combined filtering on differential mode and common mode electromagnetic noise in the high-voltage direct-current bus, and performing third filtering on the common mode electromagnetic noise in the high-voltage direct-current bus through a second-stage common mode inductor L2; high low frequency combination filter circuit that high low frequency combination filter circuit and Y electric capacity C7 that constitutes through Y electric capacity C6 and Y electric capacity C8 constitute at last and the high low frequency combination filter circuit that Y electric capacity C9 constitutes, common mode electromagnetic noise to in the high voltage direct current bus carries out filtering once more, exports for the back stage circuit after the filtering, like high power switch device, the utility model discloses a common mode inductance, differential mode inductance, X electric capacity and Y electric capacity form the combination of multiple filtering measure, and it can effectively restrain the high voltage direct current power supply in the differential mode component, the electromagnetic noise that the common mode component brought, the switching noise filtering effect is better, has significantly reduced the interference influence that produces other devices of vehicle. Moreover, the differential mode inductor adopted by the utility model has very obvious inhibiting effect on the conduction noise of the frequency band of 150kHz-30 MHz.
Example two:
as shown in fig. 2, the technical solution in this embodiment is substantially the same as that in the first embodiment, except that the filter circuit for a dc power supply port of a new energy vehicle further includes an X capacitor C10, one end of the X capacitor C10 is connected to one end of the Y capacitor C6, and the other end of the X capacitor C10 is connected to one end of the Y capacitor C7. The application of the X capacitor C10 can further filter the electromagnetic noise caused by the differential mode component in the circuit, and improve the filtering effect of the noise in the circuit.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (6)
1. A filter circuit for a direct current power port of a new energy automobile comprises a positive copper bar (4) used for connecting the positive pole of a high-voltage direct current bus and a negative copper bar (5) used for connecting the negative pole of the high-voltage direct current bus, it is characterized by also comprising a first-stage common mode inductor L1, a differential mode filtering module (1), a second-stage common mode inductor L2, a common-differential mode capacitor group (2) consisting of an X capacitor and a Y capacitor and a common mode capacitor group (3) consisting of a Y capacitor, the positive and negative input ends of the first-stage common-mode inductor L1 are respectively and correspondingly connected with a positive copper bar (4) and a negative copper bar (5), the positive and negative output ends of the first-stage common mode inductor L1 are connected with a differential mode filtering module (1), the differential mode filtering module (1) is connected with the input end of a second-stage common mode inductor L2 through a common-differential mode capacitor bank (2), and the output end of the second-stage common mode inductor L2 is connected with a common mode capacitor bank (3).
2. The filter circuit for the direct current power port of the new energy automobile according to claim 1, wherein the differential mode filter module (1) comprises a differential mode inductor L3 and a differential mode inductor L4, one end of the differential mode inductor L3 is connected to a positive output end of a first stage common mode inductor L1, one end of the differential mode inductor L4 is connected to a negative output end of a first stage common mode inductor L1, and the other end of the differential mode inductor L3 and the other end of the differential mode inductor L4 are respectively connected to a common differential mode capacitor bank (2).
3. The filter circuit for the direct current power supply port of the new energy automobile as claimed in claim 2, wherein the common-differential mode capacitor bank (2) includes an X capacitor C1, a Y capacitor C2, a Y capacitor C3, a Y capacitor C4 and a Y capacitor C5, two ends of the X capacitor C1 are respectively connected to a differential mode inductor L3 and a differential mode inductor L4, one end of the Y capacitor C2 and the Y capacitor C3 after being connected in parallel is respectively connected to one end of the X capacitor C1 and one input end of a second-stage common mode inductor L2, the other end of the Y capacitor C2 and the other end of the Y capacitor C3 after being connected in parallel are grounded, the other end of the Y capacitor C4 and the other end of the Y capacitor C5 after being connected in parallel are respectively connected to the other end of the X capacitor C1 and the other input end of the second-stage common mode inductor L2, and the other end of the Y capacitor C4 and the Y capacitor C5 after being connected in parallel are grounded.
4. The filter circuit for the DC power supply port of the new energy automobile as claimed in claim 1, 2 or 3, wherein the common mode capacitor bank (3) comprises a Y capacitor C6 and a Y capacitor C7, one end of the Y capacitor C6 is connected to an output terminal of the second stage common mode inductor L2, the other end of the Y capacitor C6 is grounded, one end of the Y capacitor C7 is connected to the other output terminal of the second stage common mode inductor L2, and the other end of the Y capacitor C7 is grounded.
5. The filter circuit for the DC power supply port of the new energy automobile as claimed in claim 4, wherein the common mode capacitor bank (3) further comprises a Y capacitor C8 and a Y capacitor C9, the Y capacitor C8 is connected in parallel with the Y capacitor C6, and the Y capacitor C9 is connected in parallel with the Y capacitor C7.
6. The filter circuit for the DC power supply port of the new energy automobile as claimed in claim 5, further comprising an X capacitor C10, wherein one end of the X capacitor C10 is connected to one end of a Y capacitor C6, and the other end of the X capacitor C10 is connected to one end of a Y capacitor C7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121139549.0U CN215186461U (en) | 2021-05-25 | 2021-05-25 | Filter circuit for direct current power port of new energy automobile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121139549.0U CN215186461U (en) | 2021-05-25 | 2021-05-25 | Filter circuit for direct current power port of new energy automobile |
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| CN215186461U true CN215186461U (en) | 2021-12-14 |
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| CN202121139549.0U Active CN215186461U (en) | 2021-05-25 | 2021-05-25 | Filter circuit for direct current power port of new energy automobile |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114619984A (en) * | 2022-03-31 | 2022-06-14 | 重庆长安新能源汽车科技有限公司 | Integrated high-voltage branching device and automobile |
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2021
- 2021-05-25 CN CN202121139549.0U patent/CN215186461U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114619984A (en) * | 2022-03-31 | 2022-06-14 | 重庆长安新能源汽车科技有限公司 | Integrated high-voltage branching device and automobile |
| CN114619984B (en) * | 2022-03-31 | 2023-06-02 | 重庆长安新能源汽车科技有限公司 | Integrated high-voltage branching device and automobile |
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