CN203135712U - Electromagnetic interference suppression circuit - Google Patents
Electromagnetic interference suppression circuit Download PDFInfo
- Publication number
- CN203135712U CN203135712U CN 201320010689 CN201320010689U CN203135712U CN 203135712 U CN203135712 U CN 203135712U CN 201320010689 CN201320010689 CN 201320010689 CN 201320010689 U CN201320010689 U CN 201320010689U CN 203135712 U CN203135712 U CN 203135712U
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- coil
- electric capacity
- pressure side
- low
- electromagnetic interference
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Abstract
Disclosed in the utility model is an electromagnetic interference suppression circuit that is composed of a primary coil, a secondary coil, a first capacitor and a second capacitor. A high-voltage side of the primary side is connected with a low-voltage side of the secondary coil by the first capacitor; and a low-voltage side of the primary coil is grounded and is connected with the low-voltage side of the secondary coil by the second capacitor. With utilization of the mode, the electromagnetic interference can be suppressed; the cost is lowered; and the potential safety hazard is reduced.
Description
Technical field
The utility model relates to the electromagnetic interference technical field, particularly relates to a kind of electromagnetic interference suppression circuit.
Background technology
Power device in the Switching Power Supply, owing to be operated in the above switching frequency of 50K, its voltage and current waveform contains abundant high order harmonic, and the existence of the stray capacitance between high frequency transformer primary and secondary winding, for these humorous wave interference provide conducting path.Be to solve the electromagnetic interference of Switching Power Supply, present way is that the input at power supply adds differential mode and the common mode filtering circuit filters common mode or differential mode interference, perhaps adopts complicated transformer winding technology, reduces the stray capacitance of transformer.
In order to satisfy the code requirement of Electro Magnetic Compatibility, Switching Power Supply has multiple mode in the processing of disturbing, increase common mode as method commonly used at input and add the differential mode filter circuit, the coiling mode that changes transformer reduces distributed capacitance, and the enhanced grounding measure increases shielding and reaches code requirement.
In the prior art, in the Switching Power Supply input circuit, install Electromagnetic interference filter additional, to suppress differential mode interference signal and common mode interference signal.As shown in Figure 1, Electromagnetic interference filter comprises common mode choke (common mode inductance) L1, differential mode capacitor C1, differential mode capacitor C2, common mode capacitance C3 and common mode capacitance C4.Common mode choke L1 is on two semi-rings up and down of a magnet ring (closed magnetic circuit), respectively the identical number of turn of coiling but around to opposite coil.The flow direction unanimity of two coils, when common mode disturbances occurred, total inductance increased the very big induction reactance of generation rapidly, thereby can suppress common mode disturbances.And the equivalent Y capacitor's capacity of Electromagnetic interference filter is bigger, and its leakage current also increases along with the increase of appearance value, increases the potential safety hazard of electric leakage, and increases cost.
The utility model content
The technical problem that the utility model mainly solves provides a kind of electromagnetic interference suppression circuit, can suppress electromagnetic interference, reduces cost, and reduces potential safety hazard.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: a kind of electromagnetic interference suppression circuit is provided, it comprises: primary coil, secondary coil, first electric capacity and second electric capacity, the high-pressure side of primary coil is connected with the low-pressure side of secondary coil by first electric capacity, the low-pressure side ground connection of primary coil, and the low-pressure side of primary coil is connected with the low-pressure side of secondary coil by second electric capacity.
Wherein, primary coil comprises first coil and second coil, and the different name end of first coil is the high-pressure side of primary coil, and the different name end of second coil is the low-pressure side of primary coil.
Wherein, first electric capacity, one end is connected with the different name end of first coil, the other end of first electric capacity is connected with the low-pressure side of secondary coil, one end of second electric capacity is connected with the different name end of second coil, the other end of second electric capacity is connected with the low-pressure side of secondary coil, and first electric capacity and second electric capacity are safety electric capacity.
The beneficial effects of the utility model are: the situation that is different from prior art, the utility model is by arranging primary coil, secondary coil, first electric capacity and second electric capacity, first electric capacity and second electric capacity are offset the electromagnetic interference that produces between primary coil and secondary coil, to suppress electromagnetic interference, reduce cost, and reduce potential safety hazard.
Description of drawings
Fig. 1 is the circuit diagram of Electromagnetic interference filter in the prior art;
Fig. 2 is the circuit diagram of the electromagnetic interference suppression circuit of the utility model first embodiment.
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the performing creative labour prerequisite, all belong to the scope of the utility model protection.
See also Fig. 2, Fig. 2 is the circuit diagram of the electromagnetic interference suppression circuit of the utility model first embodiment.As shown in Figure 2, the electromagnetic interference suppression circuit 20 that discloses of present embodiment comprises: primary coil 201, secondary coil 202, first electric capacity 203 and second electric capacity 204.
In the present embodiment, primary coil 201 comprises first coil 205 and second coil 206, and wherein, the different name end 207 of first coil 205 is the high-pressure side of primary coil, and the different name end 208 of second coil 206 is the low-pressure side of primary coil.The high-pressure side of primary coil 201 is connected with the low-pressure side 209 of secondary coil 202 by first electric capacity 203, namely the different name end 207 of first coil 205 is connected with an end of first electric capacity 203, and the other end of first electric capacity 203 is connected with the low-pressure side 209 of secondary coil 202.The low-pressure side ground connection of primary coil 201, and the low-pressure side of primary coil 201 is connected with the low-pressure side 209 of secondary coil by second electric capacity 204, i.e. different name end 208 ground connection of second coil 206, and the different name end 208 of second coil 206 is connected with an end of second electric capacity 204, and the other end of second electric capacity 204 is connected with the low-pressure side of secondary coil 209.
In this enforcement, first coil 205 and the distributed capacitance between the secondary coil 202 of first electric capacity 203 and primary coil 201 are suitable, with first coil 205 of inhibition primary coil 201 and the electromagnetic interference of the coupling of the distributed capacitance between the secondary coil 202 generation.Second coil 206 and the distributed capacitance between the secondary coil 202 of second electric capacity 204 and primary coil 201 are suitable, with second coil 206 of inhibition primary coil 201 and the electromagnetic interference of the coupling of the distributed capacitance between the secondary coil 202 generation.
It should be noted that first electric capacity 203 and second electric capacity 204 that present embodiment discloses are preferably safety electric capacity.
In sum, the electromagnetic interference suppression circuit 20 that present embodiment discloses is offset the electromagnetic interference that produces by first electric capacity 203 and second electric capacity 204 between primary coil 201 and secondary coil 202, to suppress electromagnetic interference, reduce cost, and reduce potential safety hazard.
The above only is embodiment of the present utility model; be not so limit claim of the present utility model; every equivalent structure or equivalent flow process conversion that utilizes the utility model specification and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present utility model.
Claims (4)
1. electromagnetic interference suppression circuit, it is characterized in that, described inhibition circuit comprises: primary coil, secondary coil, first electric capacity and second electric capacity, the high-pressure side of described primary coil is connected with the low-pressure side of described secondary coil by described first electric capacity, the low-pressure side ground connection of described primary coil, and the low-pressure side of described primary coil is connected with the low-pressure side of described secondary coil by described second electric capacity.
2. inhibition circuit according to claim 1, it is characterized in that, described primary coil comprises first coil and second coil, and the different name end of described first coil is the high-pressure side of described primary coil, and the different name end of described second coil is the low-pressure side of described primary coil.
3. inhibition circuit according to claim 2, it is characterized in that, described first electric capacity, one end is connected with the different name end of described first coil, the other end of described first electric capacity is connected with the low-pressure side of described secondary coil, one end of described second electric capacity is connected with the different name end of described second coil, and the other end of described second electric capacity is connected with the low-pressure side of described secondary coil.
4. inhibition circuit according to claim 1 is characterized in that, described first electric capacity and described second electric capacity are safety electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320010689 CN203135712U (en) | 2013-01-09 | 2013-01-09 | Electromagnetic interference suppression circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320010689 CN203135712U (en) | 2013-01-09 | 2013-01-09 | Electromagnetic interference suppression circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203135712U true CN203135712U (en) | 2013-08-14 |
Family
ID=48943651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320010689 Expired - Fee Related CN203135712U (en) | 2013-01-09 | 2013-01-09 | Electromagnetic interference suppression circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203135712U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105610317A (en) * | 2016-01-11 | 2016-05-25 | 深圳市志凌伟业技术股份有限公司 | Touch display device and driving circuit thereof |
-
2013
- 2013-01-09 CN CN 201320010689 patent/CN203135712U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105610317A (en) * | 2016-01-11 | 2016-05-25 | 深圳市志凌伟业技术股份有限公司 | Touch display device and driving circuit thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHENZHEN SKYWORTH DIGITAL TECHNOLOGY CO., LTD. Free format text: FORMER NAME: SKY-WORTH DIGITAL TECHNOLOGY CO., LTD.;SHENZHEN CITY |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 518000 Guangdong city of Shenzhen province Nanshan District Gao Xin Road SKYWORTH building A block 14 layer Patentee after: SHENZHEN SKYWORTH DIGITAL TECHNOLOGY Co.,Ltd. Address before: 518000 Guangdong city of Shenzhen province Nanshan District Gao Xin Road SKYWORTH building A block 14 layer Patentee before: SHENZHEN SKYWORTH DIGITAL TECHNOLOGY Co.,Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130814 Termination date: 20220109 |