CN202103410U - Over-temperature protection circuit of switch power supply - Google Patents
Over-temperature protection circuit of switch power supply Download PDFInfo
- Publication number
- CN202103410U CN202103410U CN2011202283083U CN201120228308U CN202103410U CN 202103410 U CN202103410 U CN 202103410U CN 2011202283083 U CN2011202283083 U CN 2011202283083U CN 201120228308 U CN201120228308 U CN 201120228308U CN 202103410 U CN202103410 U CN 202103410U
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- triode
- resistance
- power supply
- capacitor
- temperature
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Abstract
The utility model relates to the technical field of the protection circuit of a switch power supply, especially an over-temperature protection circuit of a switch power supply, comprising a triode Q10, a triode Q11, a triode Q12, a resistor R45, a resistor R46, a resistor R47, a resistor R48, a resistor R49, an NTC thermistor, a capacitor C25 and a capacitor C26. When a temperature exceeds a critical temperature, a temperature signal can be monitored, the output end of a trigger latch circuit sends a low level signal to a control chip, and the control chip controls the switch power supply to stop operating, thus having over-temperature protection effect for the switch power supply. The over-temperature protection circuit has stable and reliable performance.
Description
Technical field
The utility model relates to the protective circuit of switch power source technical field, particularly relates to a kind of thermal-shutdown circuit of Switching Power Supply.
Background technology
Thermal-shutdown circuit mainly is to wait through sense switch power supply, power device or radiator to judge whether temperature is too high.When the Switching Power Supply operate as normal, its temperature generally can not surpass critical temperature; When Switching Power Supply occurs when unusual, temperature can raise rapidly, if there is not thermal-shutdown circuit, the temperature of Switching Power Supply can continue to raise, and when reaching uniform temperature, can burn Switching Power Supply and circuit board, causes fire when serious.
Therefore, need the thermal-shutdown circuit that a kind of Switching Power Supply is provided badly.
Summary of the invention
The purpose of the utility model is to avoid weak point of the prior art and thermal-shutdown circuit that a kind of Switching Power Supply is provided.
The purpose of the utility model realizes through following technical measures:
A kind of thermal-shutdown circuit of Switching Power Supply is provided; Include triode Q10, triode Q11, triode Q12; Resistance R 45, resistance R 46, resistance R 47, resistance R 48, resistance R 49, NTC thermistor, capacitor C 25, capacitor C 26; Wherein, One end of NTC thermistor is connected with an end of an end of resistance R 45, resistance R 46, and the other end of NTC thermistor is connected with an end of resistance R 48, and the other end of resistance R 48 is connected with an end of resistance R 47, an end of resistance R 49, an end of capacitor C 26; The other end of resistance R 47 is connected with an end of capacitor C 25, the base stage of triode Q10, the collector electrode of triode Q11, the base stage of triode Q12; The base stage of triode Q11 is connected with the other end of resistance R 45, the collector electrode of triode Q12, and the emitter of triode Q11 is connected with the other end of resistance R 46, and the collector electrode of triode Q10 is connected with the signal output part of Switching Power Supply; The emitter of triode Q10 is connected with the emitter of triode Q12, the other end of capacitor C 25, the other end of capacitor C 26, the other end of resistance R 49, and an end of said NTC thermistor is connected with the temperature signal monitoring side.
Wherein, the model of said triode Q10, triode Q11, triode Q12 is BC807-25.
The beneficial effect of the utility model:
The thermal-shutdown circuit of a kind of Switching Power Supply of the utility model; Include triode Q10, triode Q11, triode Q12; Resistance R 45, resistance R 46, resistance R 47, resistance R 48, resistance R 49, NTC thermistor, capacitor C 25, capacitor C 26; Wherein, One end of NTC thermistor is connected with an end of an end of resistance R 45, resistance R 46, and the other end of NTC thermistor is connected with an end of resistance R 48, and the other end of resistance R 48 is connected with an end of resistance R 47, an end of resistance R 49, an end of capacitor C 26; The other end of resistance R 47 is connected with an end of capacitor C 25, the base stage of triode Q10, the collector electrode of triode Q11, the base stage of triode Q12; The base stage of triode Q11 is connected with the other end of resistance R 45, the collector electrode of triode Q12, and the emitter of triode Q11 is connected with the other end of resistance R 46, and the collector electrode of triode Q10 is connected with the signal output part of Switching Power Supply; The emitter of triode Q10 is connected with the emitter of triode Q12, the other end of capacitor C 25, the other end of capacitor C 26, the other end of resistance R 49, and an end of NTC thermistor is connected with the temperature signal monitoring side.When temperature surpasses the critical temperature of setting; The utility model monitors this temperature signal; Send low level signal through the output that triggers latch cicuit and give control chip; The control chip control switching quits work then, thereby Switching Power Supply is played the effect of overheat protector, and it is stable and reliable for performance.
Description of drawings
Utilize accompanying drawing that the utility model is further specified, but the content in the accompanying drawing does not constitute any restriction to the utility model.
Fig. 1 is the circuit diagram of thermal-shutdown circuit of a kind of Switching Power Supply of the utility model.
Embodiment
In conjunction with following examples the utility model is further described:
The embodiment of the thermal-shutdown circuit of a kind of Switching Power Supply of the utility model is as shown in Figure 1; Include triode Q10, triode Q11, triode Q12; Resistance R 45, resistance R 46, resistance R 47, resistance R 48, resistance R 49, NTC thermistor, capacitor C 25, capacitor C 26; Wherein, One end of NTC thermistor is connected with an end of an end of resistance R 45, resistance R 46, and the other end of NTC thermistor is connected with an end of resistance R 48, and the other end of resistance R 48 is connected with an end of resistance R 47, an end of resistance R 49, an end of capacitor C 26; The other end of resistance R 47 is connected with an end of capacitor C 25, the base stage of triode Q10, the collector electrode of triode Q11, the base stage of triode Q12; The base stage of triode Q11 is connected with the other end of resistance R 45, the collector electrode of triode Q12, and the emitter of triode Q11 is connected with the other end of resistance R 46, and the collector electrode of triode Q10 is connected with the signal output part of Switching Power Supply; The emitter of triode Q10 is connected with the emitter of triode Q12, the other end of capacitor C 25, the other end of capacitor C 26, the other end of resistance R 49, and an end of NTC thermistor is connected with the temperature signal monitoring side.
In the foregoing circuit; The NTC thermistor changes with temperature; When temperature surpassed the critical temperature of setting, the utility model monitored this temperature signal, sent low level signal through the output that triggers latch cicuit and gave control chip; The control chip control switching quits work then, thereby Switching Power Supply is played the effect of overheat protector.
In the present embodiment, as embodiment preferred, the model of triode Q10, triode Q11, triode Q12 is BC807-25.
Its operation principle is following: the temperature signal monitoring side monitors the signal of temperature threshold value, triode Q12 conducting, and triode Q11 work, triode Q10 conducting, triode Q10 output are hanged down electricity frequency signal to control chip, thereby Switching Power Supply is quit work.
Should be noted that at last; Above embodiment only be used to explain the utility model technical scheme but not to the restriction of the utility model protection range; Although the utility model has been done detailed description with reference to preferred embodiment; Those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement the technical scheme of the utility model, and do not break away from the essence and the scope of the utility model technical scheme.
Claims (2)
1. the thermal-shutdown circuit of a Switching Power Supply; It is characterized in that: the thermal-shutdown circuit of said Switching Power Supply includes triode Q10, triode Q11, triode Q12; Resistance R 45, resistance R 46, resistance R 47, resistance R 48, resistance R 49; The NTC thermistor; Capacitor C 25, capacitor C 26, wherein, an end of NTC thermistor is connected with an end of an end of resistance R 45, resistance R 46; The other end of NTC thermistor is connected with an end of resistance R 48; The other end of resistance R 48 is connected with an end of resistance R 47, an end of resistance R 49, an end of capacitor C 26, and the other end of resistance R 47 is connected with an end of capacitor C 25, the base stage of triode Q10, the collector electrode of triode Q11, the base stage of triode Q12, and the base stage of triode Q11 is connected with the other end of resistance R 45, the collector electrode of triode Q12; The emitter of triode Q11 is connected with the other end of resistance R 46; The collector electrode of triode Q10 is connected with the signal output part of Switching Power Supply, and the emitter of triode Q10 is connected with the emitter of triode Q12, the other end of capacitor C 25, the other end of capacitor C 26, the other end of resistance R 49, and an end of said NTC thermistor is connected with the temperature signal monitoring side.
2. the thermal-shutdown circuit of the described a kind of Switching Power Supply of claim 1, it is characterized in that: the model of said triode Q10, triode Q11, triode Q12 is BC807-25.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202283083U CN202103410U (en) | 2011-06-30 | 2011-06-30 | Over-temperature protection circuit of switch power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202283083U CN202103410U (en) | 2011-06-30 | 2011-06-30 | Over-temperature protection circuit of switch power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202103410U true CN202103410U (en) | 2012-01-04 |
Family
ID=45389407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202283083U Expired - Fee Related CN202103410U (en) | 2011-06-30 | 2011-06-30 | Over-temperature protection circuit of switch power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202103410U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105162082A (en) * | 2015-08-25 | 2015-12-16 | 深圳市商宇电子科技有限公司 | Over-temperature protection circuit of uninterruptible power supply (UPS) charger |
-
2011
- 2011-06-30 CN CN2011202283083U patent/CN202103410U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105162082A (en) * | 2015-08-25 | 2015-12-16 | 深圳市商宇电子科技有限公司 | Over-temperature protection circuit of uninterruptible power supply (UPS) charger |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| 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: 20120104 Termination date: 20190630 |