CN203243033U - Power supply protection circuit - Google Patents
Power supply protection circuit Download PDFInfo
- Publication number
- CN203243033U CN203243033U CN 201320242398 CN201320242398U CN203243033U CN 203243033 U CN203243033 U CN 203243033U CN 201320242398 CN201320242398 CN 201320242398 CN 201320242398 U CN201320242398 U CN 201320242398U CN 203243033 U CN203243033 U CN 203243033U
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- diode
- switching tube
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Abstract
The utility model discloses a power supply protection circuit. The circuit comprises a rectifier stack BD1, a transient impact protection circuit, a switch transformer T1, a load matching resistor, and a switch control circuit. The transient impact protection circuit is in parallel connection between the output end of the rectifier stack BD1 and the primary coil of the switch transformer T1; the switch control circuit is in serial connection with the transient impact protection circuit; and the load matching resistor is in parallel connection with the secondary coil of the switch transformer T1. The power supply protection circuit uses the transient impact protection circuit to release energy so as to ensure a switching tube Q1 to be operated within normal parameters, to prevent an indirect lightning strike and a transient overshoot voltage from breaking through the switching tube, and to protect the power supply circuit, so that the whole circuit can be normally operated in bad conditions.
Description
Technical field
The utility model relates to a kind of power protecting circuit, and particularly a kind of LED streetlamp driving power supply protective circuit belongs to the power protection field.
Background technology
At present, the LED streetlamp driving power supply of commonly using on the market, the general one pole PFC framework that adopts, such framework is at the output of products terminal shortcircuit or when input runs into indirect lightning strike, on power conversion apparatus switch transformer T1 is elementary, transient overshoot voltage occurs and cause switching tube to puncture, cause power supply to disconnect, thereby affect the work of whole circuit.
Summary of the invention
The technical problem that (one) will solve
For addressing the above problem, the utility model proposes a kind of power protecting circuit, effectively prevented the situation of indirect lightning strike and transient overshoot voltage breakdown switching tube.
(2) technical scheme
Power protecting circuit of the present utility model comprises rectistack BD1, transient impact protective circuit, switch transformer T1, load matched resistance, ON-OFF control circuit; Between described transient impact protective circuit access in parallel rectistack BD1 output and the switch transformer T1 primary coil; Described ON-OFF control circuit is connected with the transient impact protective circuit; T1 level of described load matched resistance access in parallel switch transformer secondary coil.
Further, described transient impact protective circuit comprises electric capacity, diode and resistance R 1; Described electric capacity comprises capacitor C and capacitor C 1; Described diode comprises diode TVS1, diode TVS2, diode TVS3 and diode TVS4, and series connection consists of the diode group between diode TVS1, diode TVS2 and the diode TVS3; Described capacitor C is in parallel with the diode group that diode TVS1, diode TVS2 and diode TVS3 consist of, and the positive pole that the negative pole of diode TVS1 meets capacitor C one end, diode TVS3 is connected ground connection with the capacitor C other end; Described diode TVS4, resistance R 1 and capacitor C 1 are connected in parallel, the positive pole of diode TVS4 links to each other with switch transformer T1 primary coil different name end, the positive pole of switch transformer T1 primary coil Same Name of Ends series diode D1, the negative pole of diode D1 links to each other with the negative pole of TVS4.
Further, described ON-OFF control circuit comprises PFC correcting chip, switching tube Q1 and resistance R 2; Described PFC correcting chip is connected with the grid of switching tube Q1, and the source electrode of switching tube Q1 is connected connection with resistance R, resistance R 2 other end ground connection, and the drain electrode of switching tube Q1 links to each other with the positive pole of diode D1.
Further, described switching tube Q1 is N channel depletion type isolated-gate field effect transistor (IGFET).
(3) beneficial effect
The utility model compared with prior art; it has following beneficial effect: power protecting circuit of the present utility model; when switch transformer T1 is elementary when transient overshoot voltage occurring; diode TVS1; diode TVS2; the diode TVS3 use of connecting; with the transient overshoot voltage clamping at diode TVS1; diode TVS2; on the diode TVS3 three tube voltage drop sums; TVS4 absorbs the peak voltage that produces because of the Q1 high-frequency switching signal simultaneously; characteristic moment of recycling diode discharges energy, guarantees that switching tube Q1 can work in the normal parameter scope, has prevented the situation of indirect lightning strike and transient overshoot voltage breakdown switching tube; protected power circuit, so that whole circuit can work in abominable situation.
Description of drawings
Fig. 1 is circuit diagram of the present utility model.
Embodiment
A kind of power protecting circuit as shown in Figure 1 comprises rectistack BD1, transient impact protective circuit, switch transformer T1, load matched resistance, ON-OFF control circuit; Between described transient impact protective circuit access in parallel rectistack BD1 output and the switch transformer T1 primary coil; Described ON-OFF control circuit is connected with the transient impact protective circuit; T1 level of described load matched resistance access in parallel switch transformer secondary coil.
Wherein, described transient impact protective circuit comprises electric capacity, diode and resistance R 1; Described electric capacity comprises capacitor C and capacitor C 1; Described diode comprises diode TVS1, diode TVS2, diode TVS3 and diode TVS4, and series connection consists of the diode group between diode TVS1, diode TVS2 and the diode TVS3; Described capacitor C is in parallel with the diode group that diode TVS1, diode TVS2 and diode TVS3 consist of, and the positive pole that the negative pole of diode TVS1 meets capacitor C one end, diode TVS3 is connected ground connection with the capacitor C other end; Described diode TVS4, resistance R 1 and capacitor C 1 are connected in parallel, the positive pole of diode TVS4 links to each other with switch transformer T1 primary coil different name end, the positive pole of switch transformer T1 primary coil Same Name of Ends series diode D1, the negative pole of diode D1 links to each other with the negative pole of TVS4; Described ON-OFF control circuit comprises PFC correcting chip, switching tube Q1 and resistance R 2; Described PFC correcting chip is connected with the grid of switching tube Q1, and the source electrode of switching tube Q1 is connected connection with resistance R, resistance R 2 other end ground connection, and the drain electrode of switching tube Q1 links to each other with the positive pole of diode D1; Described switching tube Q1 is N channel depletion type isolated-gate field effect transistor (IGFET).
Power protecting circuit of the present utility model; when switch transformer T1 is elementary when transient overshoot voltage occurring; diode TVS1; diode TVS2; the diode TVS3 use of connecting; with the transient overshoot voltage clamping at diode TVS1; diode TVS2; on the diode TVS3 three tube voltage drop sums, simultaneously TVS4 absorbs the peak voltage that produces because of the Q1 high-frequency switching signal, and characteristic moment of recycling diode discharges energy; guarantee that switching tube Q1 can work in the normal parameter scope; whole circuit prevented the situation of indirect lightning strike and transient overshoot voltage breakdown switching tube, protected power circuit, so that can work in abominable situation.
Embodiment recited above is described preferred implementation of the present utility model, is not that design of the present utility model and scope are limited.Under the prerequisite that does not break away from the utility model design concept; various modification and improvement that this area ordinary person makes the technical solution of the utility model; all should drop into protection range of the present utility model; the technology contents that the utility model is asked for protection all is documented in claims.
Claims (4)
1. a power protecting circuit is characterized in that: comprise rectistack BD1, transient impact protective circuit, switch transformer T1, load matched resistance, ON-OFF control circuit; Between described transient impact protective circuit access in parallel rectistack BD1 output and the switch transformer T1 primary coil; Described ON-OFF control circuit is connected with the transient impact protective circuit; T1 level of described load matched resistance access in parallel switch transformer secondary coil.
2. power protecting circuit according to claim 1, it is characterized in that: described transient impact protective circuit comprises electric capacity, diode and resistance R 1; Described electric capacity comprises capacitor C and capacitor C 1; Described diode comprises diode TVS1, diode TVS2, diode TVS3 and diode TVS4, and series connection consists of the diode group between diode TVS1, diode TVS2 and the diode TVS3; Described capacitor C is in parallel with the diode group that diode TVS1, diode TVS2 and diode TVS3 consist of, and the positive pole that the negative pole of diode TVS1 meets capacitor C one end, diode TVS3 is connected ground connection with the capacitor C other end; Described diode TVS4, resistance R 1 and capacitor C 1 are connected in parallel, the positive pole of diode TVS4 links to each other with switch transformer T1 primary coil different name end, the positive pole of switch transformer T1 primary coil Same Name of Ends series diode D1, the negative pole of diode D1 links to each other with the negative pole of TVS4.
3. power protecting circuit according to claim 1, it is characterized in that: described ON-OFF control circuit comprises PFC correcting chip, switching tube Q1 and resistance R 2; Described PFC correcting chip is connected with the grid of switching tube Q1, and the source electrode of switching tube Q1 is connected connection with resistance R, resistance R 2 other end ground connection, and the drain electrode of switching tube Q1 links to each other with the positive pole of diode D1.
4. power protecting circuit according to claim 3, it is characterized in that: described switching tube Q1 is N channel depletion type isolated-gate field effect transistor (IGFET).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320242398 CN203243033U (en) | 2013-05-07 | 2013-05-07 | Power supply protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320242398 CN203243033U (en) | 2013-05-07 | 2013-05-07 | Power supply protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203243033U true CN203243033U (en) | 2013-10-16 |
Family
ID=49320292
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320242398 Expired - Fee Related CN203243033U (en) | 2013-05-07 | 2013-05-07 | Power supply protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203243033U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105119781A (en) * | 2015-09-16 | 2015-12-02 | 成都比善科技开发有限公司 | Smart power grid network message aggregation device and smart power grid network message aggregation method |
-
2013
- 2013-05-07 CN CN 201320242398 patent/CN203243033U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105119781A (en) * | 2015-09-16 | 2015-12-02 | 成都比善科技开发有限公司 | Smart power grid network message aggregation device and smart power grid network message aggregation method |
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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: JIANGSU LVYOU OPTOELECTRONIC TECHNOLOGY CO., LTD. Free format text: FORMER NAME: SUQIAN LVYOU OPTOELECTRONIC TECHNOLOGY CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: 223700 No. 18, Fuyang Road, Shuyang Economic Development Zone, Jiangsu, Suqian Patentee after: Jiangsu Lvyou Optoelectronic Technology Co., Ltd. Address before: 223700 No. 22, Yongjia Road, Shuyang Economic Development Zone, Jiangsu, Suqian Patentee before: Suzhou Lvyou Opto Technology Co., Ltd. |
|
| CP03 | Change of name, title or address | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131016 Termination date: 20190507 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |