CN207652027U - A kind of Switching Power Supply thermal-shutdown circuit - Google Patents
A kind of Switching Power Supply thermal-shutdown circuit Download PDFInfo
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- CN207652027U CN207652027U CN201721684640.4U CN201721684640U CN207652027U CN 207652027 U CN207652027 U CN 207652027U CN 201721684640 U CN201721684640 U CN 201721684640U CN 207652027 U CN207652027 U CN 207652027U
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- resistance
- type triode
- thermistor
- power supply
- zener diode
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- 239000004744 fabric Substances 0.000 abstract description 4
- 230000005611 electricity Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 238000011896 sensitive detection Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The utility model discloses a kind of Switching Power Supply thermal-shutdown circuit, includes PNP type triode Q1, NPN type triode Q2, zener diode ZD1, thermistor Rt, resistance R2, resistance R3 and resistance R4；One end of thermistor Rt and one end of resistance R2 are all connected with power supply VCC, one end of the negative pole end and resistance R4 of the other end connection zener diode ZD1 of thermistor Rt, one end of the collector of the positive terminal connection PNP type triode Q1 of zener diode ZD1, the base stage and resistance R3 of NPN type triode Q2, the emitter of the other end of resistance R3, the other end of resistance R4 and NPN type triode Q2 are grounded.The utility model application is strong, and the PWN outputs that can be adapted for all Switching Power Supply IC carry out dragging down protection, can also power to IC or IC protection pins level carries out dragging down protection etc.；Fabric swatch space can be saved, easy device saves space holds of the IC on PCB, and reduces cost, and great convenience is provided to integrated high compact board.
Description
Technical field
The utility model is related to switching power circuit field technologies, refer in particular to a kind of Switching Power Supply over-temperature protection electricity
Road.
Background technology
Traditional temperature protection mode circuit is that experience ambient temperature changing value by thermo-sensitive resistor big to change voltage
It is small, it recycles the mode of comparator IC comparison voltages to go control triode that controlled pin level is enabled to drag down and is protected.In reality
In, often occur that overheat protector is unstable, occurs protecting the state to work a little while a little while sometimes, and traditional approach IC
Cost is higher, the relative complex waste PCB fabric swatch space of circuit.
Utility model content
In view of this, the utility model is in view of the existing deficiencies of the prior art, main purpose is to provide a kind of switch electricity
Source thermal-shutdown circuit can effectively solve the problems, such as that there are unstable, complicated, of high cost for existing protection circuit.
To achieve the above object, the utility model is using following technical solution：
A kind of Switching Power Supply thermal-shutdown circuit includes PNP type triode Q1, NPN type triode Q2, two pole of voltage stabilizing
Pipe ZD1, thermistor Rt, resistance R2, resistance R3 and resistance R4；One end of thermistor Rt and one end of resistance R2 connect
Connect power supply VCC, one end of the negative pole end and resistance R4 of the other end connection zener diode ZD1 of thermistor Rt, the voltage stabilizing two
One end of the collector of the positive terminal connection PNP type triode Q1 of pole pipe ZD1, the base stage and resistance R3 of NPN type triode Q2, electricity
The other end, the other end of resistance R4 and the emitter of NPN type triode Q2 of resistance R3 is grounded, the collection of NPN type triode Q2
Electrode connects the base stage of PNP type triode Q1, and the emitter of PNP type triode Q1 and the other end of resistance R2 are all connected with output
Hold Uout.
As a preferred embodiment, the thermistor Rt is the thermistor of plug-in unit or patch negative temperature coefficient.
The utility model has clear advantage and advantageous effect compared with prior art, specifically, by above-mentioned technology
Known to scheme：
The utility model application is strong, and the PWN outputs that can be adapted for all Switching Power Supply IC carry out dragging down protection, also may be used
To carry out dragging down protection etc. to IC power supplies or IC protection pins level；Fabric swatch space can be saved, easy device saves IC and exists
Space hold on PCB, and cost is reduced, provide great convenience to integrated high compact board.
More clearly to illustrate the structure feature and effect of the utility model, come below in conjunction with the accompanying drawings with specific embodiment pair
The utility model is described in detail.
Description of the drawings
Fig. 1 is the structural schematic diagram of the preferred embodiment of the utility model.
Specific implementation mode
It please refers to shown in Fig. 1, that show the concrete structures of the preferred embodiment of the utility model, include positive-negative-positive
Triode Q1, NPN type triode Q2, zener diode ZD1, thermistor Rt, resistance R2, resistance R3 and resistance R4.
One end of thermistor Rt and one end of resistance R2 are all connected with power supply VCC, the other end connection of thermistor Rt
One end of the negative pole end and resistance R4 of zener diode ZD1, the positive terminal connection PNP type triode Q1 of zener diode ZD1
Collector, NPN type triode Q2 base stage and resistance R3 one end, the other end of resistance R3, the other end and NPN of resistance R4
The emitter of type triode Q2 is grounded, the base stage of the collector connection PNP type triode Q1 of NPN type triode Q2, the PNP
The emitter of type triode Q1 and the other end of resistance R2 are all connected with output end Uout.
The operation principle that the present embodiment is described in detail is as follows：
In use, sensitive detection parts can be used as by the thermistor Rt of plug-in unit or patch negative temperature coefficient, to being tested device
The high position of the calorific values such as part such as electrolytic capacitor, metal-oxide-semiconductor, rectifier bridge, common mode inductance, transformer is monitored, once measured position
It is more than that successively output end Uout position voltages are drawn in triggering by set temperature PNP type triode Q1 and NPN type triode Q2 to set temperature
Low, the connect positions output end Uout can be the Vdd power pins that Switching Power Supply controls IC, or control the PWN pins of IC,
The Vdd power pins or PWN pins of power supply control IC are once pulled low, and for metal-oxide-semiconductor without switch motion, power of the whole machine enters protection shape
State.
The design focal point of the utility model is：The utility model application is strong, can be adapted for all Switching Power Supply IC
PWN outputs carry out dragging down protection, can also power to IC or IC protection pins level drag down and be protected etc.；Fabric swatch can be saved
Space, easy device saves space holds of the IC on PCB, and reduces cost, provides integrated high compact board
Great convenience.
The above descriptions are merely preferred embodiments of the present invention, not makees to the technical scope of the utility model
Any restrictions, therefore any trickle amendment made by the above technical examples according to the technical essence of the present invention, equivalent change
Change and modify, is still within the scope of the technical solutions of the present invention.
Claims (2)
1. a kind of Switching Power Supply thermal-shutdown circuit, it is characterised in that：Include PNP type triode Q1, NPN type triode
Q2, zener diode ZD1, thermistor Rt, resistance R2, resistance R3 and resistance R4；One end of thermistor Rt and resistance
One end of R2 is all connected with power supply VCC, the negative pole end of the other end connection zener diode ZD1 of thermistor Rt and the one of resistance R4
End, the collector of the positive terminal connection PNP type triode Q1 of zener diode ZD1, the base stage and resistance of NPN type triode Q2
The emitter of one end of R3, the other end of resistance R3, the other end of resistance R4 and NPN type triode Q2 is grounded, the NPN type three
The base stage of the collector connection PNP type triode Q1 of pole pipe Q2, the other end of the emitter and resistance R2 of PNP type triode Q1
It is all connected with output end Uout.
2. a kind of Switching Power Supply thermal-shutdown circuit according to claim 1, it is characterised in that：The thermistor Rt
For plug-in unit or the thermistor of patch negative temperature coefficient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721684640.4U CN207652027U (en) | 2017-12-06 | 2017-12-06 | A kind of Switching Power Supply thermal-shutdown circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721684640.4U CN207652027U (en) | 2017-12-06 | 2017-12-06 | A kind of Switching Power Supply thermal-shutdown circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207652027U true CN207652027U (en) | 2018-07-24 |
Family
ID=62879459
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721684640.4U Active CN207652027U (en) | 2017-12-06 | 2017-12-06 | A kind of Switching Power Supply thermal-shutdown circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207652027U (en) |
-
2017
- 2017-12-06 CN CN201721684640.4U patent/CN207652027U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: An over temperature protection circuit for switching power supply Effective date of registration: 20210618 Granted publication date: 20180724 Pledgee: Xiamen finance Company limited by guarantee Pledgor: XIAMEN Z&H ELECTRONIC TECHNOLOGY Co.,Ltd. Registration number: Y2021980004974 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20220905 Granted publication date: 20180724 Pledgee: Xiamen finance Company limited by guarantee Pledgor: XIAMEN Z&H ELECTRONIC TECHNOLOGY CO.,LTD. Registration number: Y2021980004974 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A switching power supply over temperature protection circuit Effective date of registration: 20220906 Granted publication date: 20180724 Pledgee: Xiamen SME Financing Guarantee Co.,Ltd. Pledgor: XIAMEN Z&H ELECTRONIC TECHNOLOGY CO.,LTD. Registration number: Y2022110000202 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Granted publication date: 20180724 Pledgee: Xiamen SME Financing Guarantee Co.,Ltd. Pledgor: XIAMEN Z&H ELECTRONIC TECHNOLOGY CO.,LTD. Registration number: Y2022110000202 |