CN201557052U - Switch power source - Google Patents
Switch power source Download PDFInfo
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- CN201557052U CN201557052U CN2009202043434U CN200920204343U CN201557052U CN 201557052 U CN201557052 U CN 201557052U CN 2009202043434 U CN2009202043434 U CN 2009202043434U CN 200920204343 U CN200920204343 U CN 200920204343U CN 201557052 U CN201557052 U CN 201557052U
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- circuit
- power supply
- switching power
- frequency noise
- low
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Abstract
The utility model discloses a switch power source, which comprises an EMI filter circuit, a rectifying filter circuit, a switch transformer and an output rectifying filter circuit. The EMI filter circuit, the rectifying filter circuit, the switch transformer and the output rectifying filter circuit are sequentially connected, the EMI filter circuit is connected to a live line joint and a zero line joint of an alternating current input power source, the switch power source further comprises a low frequency noise inhibiting circuit, and the low frequency noise inhibiting circuit is respectively connected to the output rectifying filter circuit and a joint of a live line of the alternating current input power source after passing through a fuse. The switch power source can inhibit low frequency noises. The utility model further provides the low frequency noise inhibiting circuit of the switch power source.
Description
Technical field
The utility model relates to a kind of Switching Power Supply.
Background technology
Fig. 1 is the circuit structure diagram of traditional Switching Power Supply.Traditional Switching Power Supply comprises EMI filter circuit, current rectifying and wave filtering circuit, switch transformer, output rectifier and filter, power switch, pwm control circuit, loop control circuit.The EMI filter circuit is couple to the live wire contact (L) and the zero line contact (N) of alternating current input power supplying.EMI filter circuit, current rectifying and wave filtering circuit, switch transformer and output rectifier and filter connect successively, then the output DC source.The PMW control circuit is connected between current rectifying and wave filtering circuit and the switch transformer.Power switch is connected between PMW control circuit and the switch transformer.Loop control circuit one end is connected to the PMW control circuit, and the other end is connected to the cathode output end of output rectifier and filter.
Owing to the circuit structure reason, the EMI filter circuit, effectively filtering removes the low-frequency noise that switch power supply itself produces, and reason is as follows:
The architectural characteristic of EMI filter circuit causes, the low-frequency noise that switch itself produces can't effectively turn back in the electrical network by the EMI filter circuit, and then be coupled in the inferior polar circuit by the distributed capacitance of Y electric capacity and transformer inside, the structure that output line by power supply is connected with electrical appliance, low-frequency noise is transferred to electrical appliance, and then has influenced the quality of communication.
The utility model content
The purpose of this utility model provides the effective filtering of a kind of energy and suppresses the Switching Power Supply of low-frequency noise.
For solving technical problem of the present utility model, the utility model discloses a kind of Switching Power Supply, it comprises EMI filter circuit, current rectifying and wave filtering circuit, switch transformer and the output rectifier and filter that connects successively, the EMI filter circuit is connected to the live wire contact and the zero line contact of alternating current input power supplying, described Switching Power Supply comprises that also low-frequency noise suppresses circuit, and described low-frequency noise suppresses circuit and is connected to the live wire of described output rectifier and filter and described alternating current input power supplying respectively through the contact behind the fuse.
As the further improvement of above-mentioned Switching Power Supply, described low-frequency noise suppresses circuit and comprises at least one Y electric capacity, and its two ends are connected to the live wire contact of described alternating current input power supplying and the ground wire contact of described Switching Power Supply respectively.
As the further improvement of above-mentioned Switching Power Supply, described low-frequency noise suppresses circuit and further comprises the common-mode inductor that is connected to described output rectifier and filter.
As the further improvement of above-mentioned Switching Power Supply, described low-frequency noise suppresses circuit and further comprises another Y electric capacity, and its two ends are connected to the zero line contact of described alternating current input power supplying and the ground wire contact of described Switching Power Supply respectively.
Compared with prior art, the utility model connects a low-frequency noise circuit in the output filter rectifier back of Switching Power Supply, effectively suppressed the low-frequency noise that Switching Power Supply produces, and circuit structure is simple, can not increase too much cost, is convenient to produce.
Description of drawings
Fig. 1 is the theory diagram of the Switching Power Supply of prior art.
Fig. 2 is the theory diagram of Switching Power Supply of the present utility model.
Fig. 3 is the circuit theory diagrams of Switching Power Supply first execution mode of the present utility model.
Fig. 4 is the circuit theory diagrams of Switching Power Supply second execution mode of the present utility model.
Fig. 5 is the circuit theory diagrams of Switching Power Supply the 3rd execution mode of the present utility model.
Embodiment
Fig. 2 shows the operation principle block diagram that low-frequency noise of the present utility model suppresses circuit.Switching Power Supply comprises that EMI filter circuit, current rectifying and wave filtering circuit, switch transformer, output rectifier and filter, power switch, pwm control circuit, loop control circuit and low-frequency noise suppress circuit.The EMI filter circuit is connected to the live wire contact (L) and the zero line contact (N) of alternating current input power supplying.EMI filter circuit, current rectifying and wave filtering circuit, switch transformer and output rectifier and filter connect successively.Low-frequency noise suppresses live wire that circuit is connected to output rectifier and filter and alternating current input power supplying respectively through the contact (A) behind the fuse, the noise of DC power supply is carried out filtering, then the output DC source.The PMW control circuit is connected between current rectifying and wave filtering circuit and the switch transformer.Power switch is connected between PMW control circuit and the switch transformer.Loop control circuit one end is connected to the PMW control circuit, and the other end is connected to the cathode output end of output rectifier and filter.
Fig. 3 is the circuit theory diagrams of Switching Power Supply first execution mode of the present utility model.In the present embodiment, low-frequency noise suppresses circuit and comprises a common mode inductor L2, a Y capacitor C Y2 and a Y capacitor C Y3, L2 is connected to output rectifier and filter, the end of CY2 and the end of CY3 are connected to the live wire of alternating current input power supplying respectively through A contact and zero line contact (N) behind the fuse, and the other end of CY2 and the other end of CY3 all are connected to the ground wire contact (G) of Switching Power Supply.The low-frequency noise that CY2 and CY3 can effectively filtering Switching Power Supply produce prevents that it is transferred in the electrical appliance by power supply output line.The inhibition that decays of the noise of the more low frequency that the L2 common-mode inductor further produces Switching Power Supply.
In first execution mode, suppress the inhibition effect that circuit effectively reaches the Switching Power Supply low-frequency noise, promoted product communication voice quality by the low-frequency noise that CY2/CY3/L2 is combined.
Fig. 4 is the circuit theory diagrams of Switching Power Supply second execution mode of the present utility model.Under the less situation of low-frequency noise that Switching Power Supply self produces,, release this low-cost execution mode in order to save cost.In this execution mode, low-frequency noise suppresses circuit and comprises a common mode inductor L2 and a Y capacitor C Y2.The two ends of CY2 are connected to the live wire of alternating current input power supplying respectively through the contact (A) behind the fuse and the ground wire contact (G) of Switching Power Supply.The low-frequency noise that CY2 can effectively filtering Switching Power Supply produces prevents that it is transferred in the electrical appliance by power supply output line.The inhibition that decays of the noise of the more low frequency that the L2 common-mode inductor further produces Switching Power Supply.
In second execution mode, suppress the inhibition effect that circuit effectively reaches the Switching Power Supply low-frequency noise, promoted product communication voice quality by the low-frequency noise that CY2/L2 is combined.
Fig. 5 is the circuit theory diagrams of Switching Power Supply the 3rd execution mode of the present utility model.Under the less situation of the low-frequency noise that Switching Power Supply self produces,, release this more lower cost solution in order to save cost.In this execution mode, low-frequency noise suppresses circuit and only comprises a Y capacitor C Y2.The two ends of CY2 are connected to the live wire of alternating current input power supplying respectively through the contact (A) behind the fuse and the ground wire contact (G) of Switching Power Supply.The low-frequency noise that CY2 can effectively filtering Switching Power Supply produces prevents that it is transferred in the electrical appliance by power supply output line, thereby reaches the purpose that promotes the product communication quality.
Compared with prior art, the utility model connects a low-frequency noise and suppresses circuit in the output filtering rectification circuit back of Switching Power Supply, effectively suppressed the low-frequency noise that Switching Power Supply produces, and circuit structure is simple, can not increase too much cost, be convenient to produce.
Claims (4)
1. Switching Power Supply, it comprises EMI filter circuit, current rectifying and wave filtering circuit, switch transformer and the output rectifier and filter that connects successively, the EMI filter circuit is connected to the live wire contact and the zero line contact of alternating current input power supplying, it is characterized in that: described Switching Power Supply comprises that further low-frequency noise suppresses circuit, and described low-frequency noise suppresses circuit and is connected to the live wire of the output of described output rectifier and filter and described alternating current input power supplying respectively through the contact behind the fuse.
2. Switching Power Supply according to claim 1 is characterized in that, described low-frequency noise suppresses circuit and comprises at least one Y electric capacity, and its two ends are connected to the live wire contact of described alternating current input power supplying and the ground wire contact of described Switching Power Supply respectively.
3. Switching Power Supply according to claim 2 is characterized in that, described low-frequency noise suppresses circuit and further comprises the common-mode inductor that is connected to described output rectifier and filter.
4. Switching Power Supply according to claim 3 is characterized in that, described low-frequency noise suppresses circuit and further comprises another Y electric capacity, and its two ends are connected to the zero line contact of described alternating current input power supplying and the ground wire contact of described Switching Power Supply respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202043434U CN201557052U (en) | 2009-09-04 | 2009-09-04 | Switch power source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202043434U CN201557052U (en) | 2009-09-04 | 2009-09-04 | Switch power source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201557052U true CN201557052U (en) | 2010-08-18 |
Family
ID=42616741
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202043434U Expired - Fee Related CN201557052U (en) | 2009-09-04 | 2009-09-04 | Switch power source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201557052U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103051197A (en) * | 2013-01-16 | 2013-04-17 | 绍兴光大芯业微电子有限公司 | Primary-side-control based control circuit structure for flyback switching power supply |
| CN105445587A (en) * | 2015-12-07 | 2016-03-30 | 珠海格力电器股份有限公司 | Serial connection fault arc detection circuit |
-
2009
- 2009-09-04 CN CN2009202043434U patent/CN201557052U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103051197A (en) * | 2013-01-16 | 2013-04-17 | 绍兴光大芯业微电子有限公司 | Primary-side-control based control circuit structure for flyback switching power supply |
| CN105445587A (en) * | 2015-12-07 | 2016-03-30 | 珠海格力电器股份有限公司 | Serial connection fault arc detection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder | ||
| CP02 | Change in the address of a patent holder |
Address after: 518000 New Lake Street, Guangming New District, Shenzhen City, Guangdong Province Patentee after: SHENZHEN FRECOM ELECTRONICS CO., LTD. Address before: 518129 Guangming Street, Baoan District, Shenzhen, Guangdong, Fu Fu Kang, Fuchuan science and Technology Park, Fu Yuan Industrial Park. Patentee before: SHENZHEN FRECOM ELECTRONICS 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: 20100818 Termination date: 20180904 |