CN202059328U - Circuit for eliminating DC-DC (direct current-direct current) conducted interference - Google Patents
Circuit for eliminating DC-DC (direct current-direct current) conducted interference Download PDFInfo
- Publication number
- CN202059328U CN202059328U CN2011201399542U CN201120139954U CN202059328U CN 202059328 U CN202059328 U CN 202059328U CN 2011201399542 U CN2011201399542 U CN 2011201399542U CN 201120139954 U CN201120139954 U CN 201120139954U CN 202059328 U CN202059328 U CN 202059328U
- Authority
- CN
- China
- Prior art keywords
- capacitor
- direct current
- converter
- circuit
- eliminating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Abstract
The utility model discloses a circuit for eliminating DC-DC (direct current-direct current) conducted interference. A capacitor C1 and a capacitor E1 are connected with a data transmission line 1 between a DC-DC converter and the input end CN1 of a PCB (printed circuit board), wherein one end of the capacitor C1 is connected with the input end 1 of the PCB; the other end of the capacitor C2 is grounded; one end of the capacitor E1 is connected with the input pin end of the DC-DC converter; and the other end of the capacitor E1 is grounded. In the utility model, the capacitor C1 and the capacitor E1 are added, so as to effectively inhibit switching noises generated by the DC-DC converter and reduce the interference value of a power source conduction test in an EMC (electro magnetic compatibility) test.
Description
Technical field
The utility model relates to the circuit field of electronic product, and the audio frequency that relates in particular to a kind of anti-external disturbance absorbs circuit.
Background technology
The operating frequency of DC-DC converter is generally at the switching frequency of tens KHz to several MHz at present, the switching noise of this low frequency is easy to interfere with in the AC adapter by the mode of the PCB cabling conduction of input, thereby have influence on the pure of whole electrical network, this is a urgent problem.
The utility model content
The purpose of this utility model provides a kind of circuit of the DC-DC of elimination conducted interference, and described circuit structure is simple, and production cost is low.
For achieving the above object, the utility model provides a kind of circuit of the DC-DC of elimination conducted interference, on the data line between DC-DC converter and the pcb board input, be connected with capacitor C 1 and electric capacity E1, capacitor C 1 one end connection PCB plate inputs wherein, other end ground connection; Electric capacity E1 one end connects DC-DC converter input pin end, other end ground connection.
Further, also be provided with a capacitor C 4, wherein capacitor C 4 one ends connect described DC-DC converter input pin end, other end ground connection.
The utility model circuit structure is simple, production cost is low, by capacitor C 1, E1 and C4 are separately positioned on the chip pin end near pcb board port and DC-DC converter in PCB layout, the operating frequency of DC-DC converter is generally at the switching frequency of tens KHz to several MHz, the switching noise of this low frequency is easy to interfere with in the AC adapter by the mode of conducting by the PCB cabling of input, thereby have influence on the pure of electrical network, therefore increase C1, can effectively suppress the switching noise that the DC-DC converter produces behind the E1 electric capacity, thereby reduce the interference value of power supply conduction test in the EMC test.
Description of drawings
Fig. 1 eliminates the circuit diagram of the circuit of DC-DC conducted interference for the utility model.
Embodiment
Please refer to Fig. 1, the utility model embodiment provides a kind of circuit of the DC-DC of elimination conducted interference, on the data line 1 between DC-DC converter and the pcb board input CN1, be connected with capacitor C 1 and electric capacity E1, capacitor C 1 one end connection PCB plate inputs 1 wherein, other end ground connection; Electric capacity E1 one end connects DC-DC converter input pin end, other end ground connection.
Further, also be provided with a capacitor C 4, wherein capacitor C 4 one ends connect described DC-DC converter input pin end, other end ground connection.
Can effectively suppress the switching noise that the DC-DC converter produces in the utility model circuit after increasing C1, E1 electric capacity, power supply conducts the interference value of test in the EMC test thereby reduce.
Claims (2)
1. circuit of eliminating the DC-DC conducted interference is characterized in that: be connected with capacitor C 1 and electric capacity E1 on the data line between DC-DC converter and the pcb board input, capacitor C 1 one end connection PCB plate inputs wherein, other end ground connection; Electric capacity E1 one end connects DC-DC converter input pin end, other end ground connection.
2. a kind of according to claim 1 circuit of eliminating the DC-DC conducted interference is characterized in that: also be provided with a capacitor C 4, wherein capacitor C 4 one ends connect described DC-DC converter input pin end, other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201399542U CN202059328U (en) | 2011-05-05 | 2011-05-05 | Circuit for eliminating DC-DC (direct current-direct current) conducted interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201399542U CN202059328U (en) | 2011-05-05 | 2011-05-05 | Circuit for eliminating DC-DC (direct current-direct current) conducted interference |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202059328U true CN202059328U (en) | 2011-11-30 |
Family
ID=45019291
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201399542U Expired - Lifetime CN202059328U (en) | 2011-05-05 | 2011-05-05 | Circuit for eliminating DC-DC (direct current-direct current) conducted interference |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202059328U (en) |
-
2011
- 2011-05-05 CN CN2011201399542U patent/CN202059328U/en not_active Expired - Lifetime
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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: GUANGZHOU CVT ELECTRONICS TECHNOLOGY CO., LTD. Free format text: FORMER NAME: GUANGZHOU SHIYUAN ELECTRONICS TECHNOLOGY CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 510663 Guangdong city of Guangzhou province Guangzhou Science City Kezhu Road No. 192 Patentee after: Guangzhou CVT Electronics Technology Co., Ltd. Address before: 510663 Guangdong city of Guangzhou province Guangzhou Science City Kezhu Road No. 192 Patentee before: Guangzhou Shiyuan Electronics Technology Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111130 |