CN204013202U - A kind of power supply entrance filter structure that improves Electro Magnetic Compatibility - Google Patents
A kind of power supply entrance filter structure that improves Electro Magnetic Compatibility Download PDFInfo
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- CN204013202U CN204013202U CN201420422824.3U CN201420422824U CN204013202U CN 204013202 U CN204013202 U CN 204013202U CN 201420422824 U CN201420422824 U CN 201420422824U CN 204013202 U CN204013202 U CN 204013202U
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- live wire
- inductance
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Abstract
The utility model discloses a kind of power supply entrance filter structure that improves Electro Magnetic Compatibility, this filter structure one end connects power supply, the other end connects load, described filter structure comprise three be connected on respectively between live wire and zero line, filter circuit between zero line and ground wire, between live wire and ground wire, and a common mode choke is set between live wire and zero line input.The utility model is simple in structure, with low cost, operational reliability is higher, operating cost is lower, and the impedance of power adapter filter input preferably, outlet side and power supply and load-side is very effective to the decay of electromagnetic interference signal.
Description
Technical field
The utility model relates to electronic measurements, measuring and controlling equipment electromagnetic compatibility field, relates in particular to a kind of power supply entrance filter structure that improves Electro Magnetic Compatibility.
Background technology
Along with scientific and technical development, the quantity of electronic system and equipment grows with each passing day, performance is also improving constantly, and forward high-frequency, ultra broadband, miniaturization, high sensitivity future development, make space electromagnetic environment complicated all the more, all can there is electromagnetic interference in every field that has electronic technology, now become the outstanding obstacle of the normal work of electronic system and equipment; Therefore, how, in complex electromagnetic environment, guaranteeing that electronic system and equipment are interference-free, and can normally work consistently, is that the electromagnetic Compatibility Design of EMC Design Technology technical barrier in the urgent need to address, especially bench device becomes more difficult.
Summary of the invention
For addressing the above problem, the utility model provides a kind of power supply entrance filter structure that improves Electro Magnetic Compatibility, this filter structure one end connects power supply, the other end connects load, described filter structure comprise three be connected on respectively between live wire and zero line, filter circuit between zero line and ground wire, between live wire and ground wire, and a common mode choke is set between live wire and zero line input.
Further, described filter circuit is passive filter circuit.
Further, described filter circuit is electric capacity, and the first electric capacity, the second electric capacity, the 3rd electric capacity are connected on respectively between live wire and zero line, between zero line and ground wire, between live wire and ground wire.
Further, described filter structure also comprises the first inductance and/or the second inductance and/or the 3rd inductance, and described the first inductance, the second inductance, the 3rd inductance are connected respectively to the output of live wire, the output of zero line, the output of ground wire.
Further, between live wire and zero line and/or between zero line and ground wire, be provided with common mode inhibition resistance.
The beneficial effects of the utility model are:
Simple in structure, with low cost, operational reliability is higher, operating cost is lower, the impedance between preferably matched filter network input, outlet side and power supply and load, very effective to the inhibition of electromagnetic interference.
Brief description of the drawings
Circuit diagram when Fig. 1 is the utility model employing L-type filter circuit.
Embodiment
Below technical solutions of the utility model are elaborated.
The utility model is the filter structure being made up of lumped-parameter element.This filter structure one end connects power supply, and the other end connects load.Described filter structure comprise three be connected on respectively between live wire L and zero line N, three filter circuits between zero line N and ground wire E, between live wire L and ground wire E, and be provided with a common mode choke at live wire L and zero line N input.
Because passive filter circuit has the advantages such as simple in structure, with low cost, operational reliability is higher, operating cost is lower, the preferred passive filter circuit of filter circuit of the present utility model.
Preferred, passive filter circuit Selection and Constitute type filter circuit, combined filter circuit can effectively suppress external interference signals, reduces external disturbance impact on equipment by power path.The utility model circuit structure below combined filter circuit being formed describes.
As shown in Figure 1, described filter structure comprises the first capacitor C 1, the second capacitor C 2 and the 3rd capacitor C 3 common mode choke L4.The first capacitor C 1, common mode inhibition resistance R 1 are connected in parallel between live wire L and zero line N, and the second capacitor C 2 is connected in parallel between live wire L and ground wire E, and the 3rd capacitor C 3 is connected in parallel between zero line N and ground wire E.Between the live wire L of power supply entrance and zero line N, be connected common mode choke L4.The existence of above-mentioned electric capacity and common mode choke can have been played good filter action.
In order to strengthen filter effect, the utility model is also preferably provided with inductance.Comprise the first inductance and/or the second inductance and/or the 3rd inductance, described the first inductance, the second inductance, the 3rd inductance be connected respectively to live wire output, zero line output, line output terminal, as shown in Figure 1.
Preferred, between live wire and zero line and/or between zero line and ground wire, be provided with common mode inhibition resistance.As the R1 in Fig. 1, R2, common mode inhibition resistance also can play good auxiliary filter effect.
Operation principle of the present utility model is as follows:
Between power supply porch live wire L and zero line N, common mode choke is set, the inductive primary of common mode choke realizes differential filtering, inductive secondary realizes common mode filtering, L, N end arranges a common mode inhibition resistance simultaneously, form respectively L-E and the low pass filter of N-E two to separate port, be used for suppressing the common-mode signal of existence in power-supply system; The input cable of filter structure is as far as possible short, simultaneously good by contacting between filter structure and casing, the common-mode filter network that L1, L2, L3, L4, C1, C3 form, can significantly reduce potential difference between connection circuit Noise and Interference signal and the earth, for the terminal impedance of 50 Ω, typical electromagnetic interface filter can reduce 55dB/ ten octaves in difference modes, is reduced to 42dB/ ten octaves in common mode.
The beneficial effects of the utility model are:
Simple in structure, with low cost, operational reliability is higher, operating cost is lower, the impedance between preferably matched filtering structure input, outlet side and power supply and load, very effective to the inhibition of electromagnetic interference.
Claims (5)
1. one kind is improved the power supply entrance filter structure of Electro Magnetic Compatibility, it is characterized in that, this filter structure one end connects power supply, the other end connects load, described filter structure comprise three be connected on respectively between live wire and zero line, filter circuit between zero line and ground wire, between live wire and ground wire, and a common mode choke is set between live wire and zero line input.
2. the power supply entrance filter structure of raising Electro Magnetic Compatibility as claimed in claim 1, is characterized in that, described filter circuit is passive filter circuit.
3. the power supply entrance filter structure of raising Electro Magnetic Compatibility as claimed in claim 1 or 2, it is characterized in that, described filter circuit is electric capacity, and the first electric capacity, the second electric capacity, the 3rd electric capacity are connected on respectively between live wire and zero line, between zero line and ground wire, between live wire and ground wire.
4. the power supply entrance filter structure of raising Electro Magnetic Compatibility as claimed in claim 3, it is characterized in that, described filter structure also comprises the first inductance and/or the second inductance and/or the 3rd inductance, and described the first inductance, the second inductance, the 3rd inductance are connected respectively to the output of live wire, the output of zero line, the output of ground wire.
5. the power supply entrance filter structure of raising Electro Magnetic Compatibility as claimed in claim 3, is characterized in that, is provided with common mode inhibition resistance between live wire and zero line and/or between zero line and ground wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420422824.3U CN204013202U (en) | 2014-07-30 | 2014-07-30 | A kind of power supply entrance filter structure that improves Electro Magnetic Compatibility |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420422824.3U CN204013202U (en) | 2014-07-30 | 2014-07-30 | A kind of power supply entrance filter structure that improves Electro Magnetic Compatibility |
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| Publication Number | Publication Date |
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| CN204013202U true CN204013202U (en) | 2014-12-10 |
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| CN201420422824.3U Active CN204013202U (en) | 2014-07-30 | 2014-07-30 | A kind of power supply entrance filter structure that improves Electro Magnetic Compatibility |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106301275A (en) * | 2016-08-30 | 2017-01-04 | 国网安徽省电力公司岳西县供电公司 | A kind of noise muffler |
| CN107134916A (en) * | 2017-06-15 | 2017-09-05 | 中国电子科技网络信息安全有限公司 | A kind of AC power conduction electromagnetic information leakage protector and method |
| CN108023559A (en) * | 2018-01-11 | 2018-05-11 | 煤炭科学技术研究院有限公司 | A kind of wave filter |
| CN113452241A (en) * | 2021-06-17 | 2021-09-28 | 珠海格力电器股份有限公司 | Common mode interference suppression device and frequency conversion electrical apparatus |
| CN115206677A (en) * | 2022-08-08 | 2022-10-18 | 珠海格力电器股份有限公司 | Common mode filter capacitor structure, PCB and wiring method thereof |
-
2014
- 2014-07-30 CN CN201420422824.3U patent/CN204013202U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106301275A (en) * | 2016-08-30 | 2017-01-04 | 国网安徽省电力公司岳西县供电公司 | A kind of noise muffler |
| CN107134916A (en) * | 2017-06-15 | 2017-09-05 | 中国电子科技网络信息安全有限公司 | A kind of AC power conduction electromagnetic information leakage protector and method |
| CN108023559A (en) * | 2018-01-11 | 2018-05-11 | 煤炭科学技术研究院有限公司 | A kind of wave filter |
| CN113452241A (en) * | 2021-06-17 | 2021-09-28 | 珠海格力电器股份有限公司 | Common mode interference suppression device and frequency conversion electrical apparatus |
| CN115206677A (en) * | 2022-08-08 | 2022-10-18 | 珠海格力电器股份有限公司 | Common mode filter capacitor structure, PCB and wiring method thereof |
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