CN206211501U - A kind of locked protection circuit of new output overvoltage - Google Patents
A kind of locked protection circuit of new output overvoltage Download PDFInfo
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- CN206211501U CN206211501U CN201621300205.2U CN201621300205U CN206211501U CN 206211501 U CN206211501 U CN 206211501U CN 201621300205 U CN201621300205 U CN 201621300205U CN 206211501 U CN206211501 U CN 206211501U
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- triode
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- power supply
- switching power
- locked loop
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- Control Of Voltage And Current In General (AREA)
Abstract
The utility model discloses a kind of new locked protection circuit of output overvoltage, including over-pressed backfeed loop and locked loop；The signal input part in locked loop is connected with the signal output part of over-pressed backfeed loop by optocoupler；Locked loop includes the first triode and the second triode, the base stage of the first triode and the second triode is interconnected with colelctor electrode, second transistor base is the signal input part in locked loop, and the radio pole of the second triode is used to export cut-off signals to Switching Power Supply IC.It is input into by optocoupler and is quickly detected over-pressed output, the peculiar connected mode of right latter two triode all maintains mutually base stage operation level after making its any conducting, the shut-off pin of Switching Power Supply IC is continuously obtained high level and turn off the output of Switching Power Supply.Complete locked Switching Power Supply can effectively protect the access circuit of rear class, and rear class the highly sensitive element of high value.Make Switching Power Supply reply work to disconnect VCC to connect, it is ensured that Switching Power Supply will not restart automatically.
Description
Technical field
The utility model is related to a kind of electronic circuit, more particularly to a kind of locked protection circuit of new output overvoltage.
Background technology
With the development and technological progress of society, various electronic products and various consumer electronicses largely occur, enter into
In people's daily life and production work.Switching Power Supply as a kind of multiple power source, be various electronics miniaturizations and it is low into
This change must be small a kind of power mode, it has also become current main flow power supply, be the features such as with its light, thin, small and high efficiency
People is familiar with, but brings a variety of harm of noise jamming simultaneously, and its conducted noise, radiated noise can involve whole machine safety, have
When can disturb some cpu instructions, cause the maloperation of system, can also cause the subversiveness of system to destroy when serious, while power network
Fluctuation produce very big inrush current shock when can cause power initiation, easily cause damage of product.Inside Switching Power Supply
Voltage stabilizing loop breaks down or due to when user's misoperation causes output overvoltage phenomenon, being easily damaged rear class electrical equipment.
Utility model content
In order to solve the above-mentioned technical problem, the utility model purpose is to provide a kind of new output overvoltage locked protection electricity
Road.
A kind of new locked protection circuit of output overvoltage described in the utility model, it is characterised in that fed back including overvoltage
Loop and locked loop；The signal input part in described locked loop is coupled with the signal output part of over-pressed backfeed loop by light
Connect；Locked loop includes the base stage and current collection of the first triode and the second triode, first triode and the second triode
Pole interconnects, and the second transistor base is the signal input part in locked loop, and the radio pole of the second triode is used for switch
Power supply IC exports cut-off signals.
Preferably, described over-pressed backfeed loop includes voltage-regulator diode, 3rd resistor；Described voltage-regulator diode it is negative
Pole is connected on switched power output, positive pole and is grounded after 3rd resistor connects optocoupler.
Preferably, the described triode of locked loop first is PNP triode, and the second triode is NPN triode；VCC
It is grounded after passing sequentially through the 5th resistance, the 6th resistance, NPN triode colelctor electrode, NPN triode radio pole and the 7th resistance, NPN
The shut-off pin of triode radio pole connecting valve power supply IC；VCC passes sequentially through first resistor, PNP triode radio pole, PNP tri-
It is grounded after pole pipe colelctor electrode, second resistance and the 8th resistance；Tie point connection PNP tri- poles between 5th resistance and the 6th resistance
Pipe base stage, second resistance is connected NPN triode base stage with the tie point of the 8th resistance；VCC is after the 4th resistance, optocoupler are input into
By the 8th resistance eutral grounding.
The utility model advantage is to be input into by optocoupler and be quickly detected over-pressed output, the spy of right latter two triode
Having connected mode makes all mutual maintenance base stage operation level after its any conducting, the shut-off pin of Switching Power Supply IC is continuously obtained
High level and turn off the output of Switching Power Supply.Complete locked Switching Power Supply can effectively protect the access circuit of rear class, and rear class
The highly sensitive element of high value.Make Switching Power Supply reply work to disconnect VCC to connect, it is ensured that Switching Power Supply will not be weighed automatically
Open.
Brief description of the drawings
Fig. 1 is the structural representation of circuit described in the utility model.
Specific embodiment
The locked protection circuit of new output overvoltage described in the utility model, as shown in figure 1, including voltage-regulator diode Z1,
The over-pressed backfeed loop of 3rd resistor R3 compositions, the negative pole of described voltage-regulator diode Z1 is connected on switched power output U0, just
Pole is grounded after 3rd resistor R3 connects optocoupler OT1.
First triode in locked loop is PNP triode Q1, and the second triode is NPN triode Q2；VCC is passed sequentially through
It is grounded after 5th resistance R5, the 6th resistance R6, NPN triode collection Q2 electrodes, NPN triode Q2 radio pole and the 7th resistance R7,
The shut-off pin of NPN triode Q2 radio pole connecting valve power supply IC；VCC passes sequentially through first resistor R1, PNP triode Q1 radio
It is grounded after pole, PNP triode Q1 colelctor electrodes, second resistance R2 and the 8th resistance R8；Between 5th resistance R5 and the 6th resistance R6
Tie point connection PNP triode Q1 base stages, second resistance R2 is connected NPN triode Q2 bases with the tie point of the 8th resistance R8
Pole；VCC is grounded after the 4th resistance R4, optocoupler OT1 are input into by the 8th resistance R8.
The locked protection circuit of new output overvoltage described in the utility model, its working process and principle is：When switch electricity
When source output voltage Uo is raised, voltage-stabiliser tube Z1 conductings order about optocoupler OT1 conductings, by opto-coupled feedback to locked loop, there is provided base
Electrode current is turned on to NPN triode Q2；Due to the conducting of NPN triode Q2, the reduction of PNP triode Q1 base voltages is also switched on,
Vcc voltage makes NPN triode Q2 turn on all the time through first resistor R1, PNP triode Q1 and second resistance R2, Switching Power Supply shut-off
Pin is high level all the time, and when turning off pin and being detected as high level, Switching Power Supply is stopped；Switching Power Supply output is locked.Work as switch
When power supply output is locked, VCC voltages need to be disconnected, power supply could recover normal work.
For a person skilled in the art, technical scheme that can be as described above and design, make other each
Plant corresponding change and deform, and all these changes and deforms the guarantor that should all belong to the utility model claim
Within the scope of shield.
Claims (3)
1. a kind of locked protection circuit of new output overvoltage, it is characterised in that including over-pressed backfeed loop and locked loop；It is described
The signal input part in locked loop be connected by optocoupler with the signal output part of over-pressed backfeed loop；Locked loop includes first
The base stage of triode and the second triode, first triode and the second triode is interconnected with colelctor electrode, the two or three pole
Pipe base stage is the signal input part in locked loop, and the radio pole of the second triode is used to export cut-off signals to Switching Power Supply IC.
2. circuit according to claim 1, it is characterised in that described over-pressed backfeed loop includes voltage-regulator diode, the
Three resistance；The negative pole of described voltage-regulator diode is connected on switched power output, positive pole and is followed by by 3rd resistor connection optocoupler
Ground.
3. circuit according to claim 1, it is characterised in that the described triode of locked loop first is PNP triode,
Second triode is NPN triode；VCC passes sequentially through the 5th resistance, the 6th resistance, NPN triode colelctor electrode, NPN triode
It is grounded behind radio pole and the 7th resistance, the shut-off pin of NPN triode radio pole connecting valve power supply IC；VCC passes sequentially through first
It is grounded after resistance, PNP triode radio pole, PNP triode colelctor electrode, second resistance and the 8th resistance；5th resistance and the 6th
Tie point connection PNP triode base stage between resistance, second resistance is connected NPN triode base with the tie point of the 8th resistance
Pole；VCC passes through the 8th resistance eutral grounding after the 4th resistance, optocoupler are input into.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621300205.2U CN206211501U (en) | 2016-11-30 | 2016-11-30 | A kind of locked protection circuit of new output overvoltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621300205.2U CN206211501U (en) | 2016-11-30 | 2016-11-30 | A kind of locked protection circuit of new output overvoltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206211501U true CN206211501U (en) | 2017-05-31 |
Family
ID=58750902
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621300205.2U Active CN206211501U (en) | 2016-11-30 | 2016-11-30 | A kind of locked protection circuit of new output overvoltage |
Country Status (1)
| Country | Link |
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| CN (1) | CN206211501U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107453608A (en) * | 2017-09-28 | 2017-12-08 | 广东美的厨房电器制造有限公司 | A kind of feedback circuit and micro-wave oven |
| CN108270199A (en) * | 2018-03-28 | 2018-07-10 | 广州金升阳科技有限公司 | A kind of output overvoltage protection circuit |
| CN109066598A (en) * | 2018-08-17 | 2018-12-21 | 广州金升阳科技有限公司 | A kind of low level triggering latching circuit |
| CN109672148A (en) * | 2019-02-21 | 2019-04-23 | 广州视源电子科技股份有限公司 | Overvoltage protection circuit |
-
2016
- 2016-11-30 CN CN201621300205.2U patent/CN206211501U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107453608A (en) * | 2017-09-28 | 2017-12-08 | 广东美的厨房电器制造有限公司 | A kind of feedback circuit and micro-wave oven |
| CN108270199A (en) * | 2018-03-28 | 2018-07-10 | 广州金升阳科技有限公司 | A kind of output overvoltage protection circuit |
| CN108270199B (en) * | 2018-03-28 | 2023-12-12 | 广州金升阳科技有限公司 | Output overvoltage protection circuit |
| CN109066598A (en) * | 2018-08-17 | 2018-12-21 | 广州金升阳科技有限公司 | A kind of low level triggering latching circuit |
| CN109672148A (en) * | 2019-02-21 | 2019-04-23 | 广州视源电子科技股份有限公司 | Overvoltage protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Qiu Zijian Inventor before: Qiu Zijian |