CN104577993B - Input voltage protection circuit of switching power supply - Google Patents
Input voltage protection circuit of switching power supply Download PDFInfo
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- CN104577993B CN104577993B CN201310466813.5A CN201310466813A CN104577993B CN 104577993 B CN104577993 B CN 104577993B CN 201310466813 A CN201310466813 A CN 201310466813A CN 104577993 B CN104577993 B CN 104577993B
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- 238000005070 sampling Methods 0.000 claims abstract description 13
- 230000000087 stabilizing effect Effects 0.000 claims description 48
- 230000005611 electricity Effects 0.000 claims description 11
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims 1
- 239000004065 semiconductor Substances 0.000 abstract description 8
- 229910044991 metal oxide Inorganic materials 0.000 abstract 1
- 150000004706 metal oxides Chemical class 0.000 abstract 1
- 230000001771 impaired effect Effects 0.000 description 5
- 230000036632 reaction speed Effects 0.000 description 2
- 208000033999 Device damage Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000033001 locomotion Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/222—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices for switches
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/042—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage comprising means to limit the absorbed power or indicate damaged over-voltage protection device
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- Dc-Dc Converters (AREA)
- Protection Of Static Devices (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a switching power supply input voltage protection circuit which comprises a switching power supply input end, a first voltage division circuit, a second voltage division circuit, a reference voltage-stabilizing source and a switching control circuit, wherein the first voltage division circuit is used for dividing the cathode voltage of the reference voltage-stabilizing source, the second voltage division circuit is used for dividing the voltage of a sampling end of the reference voltage-stabilizing source, the switching control circuit is used for controlling the on-off of the switching power supply, the sampling voltage of the reference voltage-stabilizing source influences the working state of the switching control circuit, and the working state of the switching control circuit influences the on-off of the switching power supply. The input voltage protection circuit of the switching power supply effectively solves the problem that an MOS (metal oxide semiconductor) tube in the switching power supply is damaged when the input voltage of the switching power supply is over-voltage and under-voltage.
Description
Technical field
The present invention relates to circuit fields, more particularly to a kind of Switching Power Supply input voltage protection circuit.
Background technology
Currently, the method for realizing Switching Power Supply bus overvoltage defencive function is divided into two kinds, one is the cores by Switching Power Supply
Piece itself carries over-voltage protecting function and realizes, but the not no defencive function of many chips, it is therefore desirable to pass through external protection
Circuit is realized；Another kind is to realize Switching Power Supply bus overvoltage defencive function by external protection circuit, and typically using should
Circuit is protected to detect busbar voltage, after the busbar voltage detected is more than certain value, the protection circuit output one can trigger
The signal of other defencive functions of switching power source chip prevents input electricity to realize Switching Power Supply bus overvoltage defencive function
When pressing through high, the device work of Switching Power Supply is damaged, due to other defencive functions of the protection circuit start switching power source chip
Premise be that could be realized in the case of input voltage overvoltage, that is, metal-oxide-semiconductor has had switch in switching power source chip
It just will appear protection when action, can not avoid metal-oxide-semiconductor in Switching Power Supply impaired completely if input voltage overvoltage
Phenomenon, especially when business air conditioner single-way switch power supply is when accessing three-phase electricity or single-phase electricity overtension, metal-oxide-semiconductor once has out
Pass action is possible to go up, and can not give and protect in the case of input voltage is under-voltage.
Invention content
Based on this, it is necessary in input voltage, when over-pressed and under-voltage, metal-oxide-semiconductor is impaired in Switching Power Supply asks
Topic, provides a kind of Switching Power Supply input voltage protection circuit.
Purpose to realize the present invention adopts the following technical scheme that：
A kind of Switching Power Supply input voltage protection circuit, including Switching Power Supply input terminal, the first bleeder circuit, the second partial pressure
Circuit, reference voltage stabilizing source and ON-OFF control circuit;
First bleeder circuit is connected in parallel with the second bleeder circuit, the input terminal of first bleeder circuit and described
The input terminal of second bleeder circuit is connect with the Switching Power Supply input terminal respectively；
First output end of first bleeder circuit connects the cathode of the reference voltage stabilizing source, first bleeder circuit
Second output terminal connect anode and the ground connection of the reference voltage stabilizing source；
First output end of second bleeder circuit connects the sampling end of the reference voltage stabilizing source, the second partial pressure electricity
The second output terminal on road is grounded；
The first input end of the ON-OFF control circuit is connect with the cathode of the reference voltage stabilizing source, the switch control electricity
The output end on road is electrically connected with the main control chip energization pins end of the Switching Power Supply, the second input of the ON-OFF control circuit
End ground connection；
Cathode of first bleeder circuit for the reference voltage stabilizing source divides, and second bleeder circuit is for described
The sampling end of reference voltage stabilizing source divides, and the ON-OFF control circuit is used to control the break-make of the Switching Power Supply, and the benchmark is steady
The sampled voltage of potential source influences the working condition of the ON-OFF control circuit, and the working condition of the ON-OFF control circuit influences institute
State the break-make of Switching Power Supply.
More preferably, first bleeder circuit includes first resistor, second resistance and 3rd resistor, the first resistor,
Second resistance and 3rd resistor series connection, are connected between the Switching Power Supply input terminal and ground terminal, the second resistance series connection
Between the first resistor and the 3rd resistor；
The first output end of the second resistance and the corresponding common end of 3rd resistor as first bleeder circuit, institute
State second output terminal of the ground terminal of 3rd resistor as first bleeder circuit.
More preferably, second bleeder circuit include the 4th resistance, the 5th resistance and the 6th resistance, the 4th resistance,
5th resistance and the series connection of the 6th resistance, are connected between the Switching Power Supply input terminal and ground terminal, the 5th resistance series connection
Between the 4th resistance and the 6th resistance；
The first output end of 5th resistance and the 6th corresponding common end of resistance as second bleeder circuit；
Second output terminal of the ground terminal of 6th resistance as second bleeder circuit.
More preferably, the ON-OFF control circuit includes the 7th resistance, the 8th resistance, diode and triode；
The base stage of the triode connects the reference voltage stabilizing source after being sequentially connected in series the 7th resistance and the diode
Cathode, diode common end corresponding with the cathode of the reference voltage stabilizing source as the ON-OFF control circuit first
Input terminal；
It is grounded after collector series connection the 8th resistance of the triode, described in the ground terminal conduct of the 8th resistance
Second input terminal of ON-OFF control circuit；
The emitter of the triode is connect with the main control chip energization pins end of the Switching Power Supply, the triode
Output end of the emitter as the ON-OFF control circuit.
More preferably, the triode is PNP triode.
More preferably, the model TL431 of the reference voltage stabilizing source.
The beneficial effects of the invention are as follows：
Switching Power Supply input voltage protection circuit provided by the invention, cathode point of first bleeder circuit to reference voltage stabilizing source
Pressure, the second bleeder circuit divide the sampling end of reference voltage stabilizing source so that the sampled voltage of reference voltage stabilizing source influences switch control
The working condition of circuit, the working condition of ON-OFF control circuit influences the break-make of Switching Power Supply, in Switching Power Supply input voltage mistake
Defencive function can be played when high or too low, efficiently solve input overvoltage and it is under-voltage when, metal-oxide-semiconductor is damaged in Switching Power Supply
The problem of.
Description of the drawings
Fig. 1 is the schematic diagram of one embodiment of Switching Power Supply input voltage protection circuit of the present invention.
Specific implementation mode
In order to keep technical scheme of the present invention clearer, below in conjunction with attached drawing, electricity is inputted to the Switching Power Supply of the present invention
Voltage protection circuit is described in further detail.It should be appreciated that described herein, specific examples are only used to explain the present invention,
It is not intended to limit the present invention.
Referring to Fig. 1, one embodiment of Switching Power Supply input voltage protection circuit of the invention includes Switching Power Supply input terminal VDC、
First bleeder circuit 100, the second bleeder circuit 200, reference voltage stabilizing source U1 and ON-OFF control circuit 300, the first bleeder circuit 100
It is connected in parallel with the second bleeder circuit 200, the input terminal of the input terminal IN110 and the second bleeder circuit of the first bleeder circuit
IN210 respectively with Switching Power Supply input terminal VDCConnection, the first output end OUT120 connection reference voltage stabilizing sources of the first bleeder circuit
Cathode CU1, the anode A U1 of the second output terminal OUT130 connection reference voltage stabilizing sources of the first bleeder circuit is simultaneously grounded, second point
The sampling end RU1 of first output end IN220 connection reference voltage stabilizing sources of volt circuit, the second output terminal of the second bleeder circuit
OUT230 is grounded, and the cathode CU1 of the first input end IN310 and reference voltage stabilizing source U1 of ON-OFF control circuit 300 are connect, switch control
The output end OUT330 of the circuit 300 processed and main control chip energization pins end V of Switching Power SupplyCCElectrical connection, ON-OFF control circuit 300
The second input terminal IN320 ground connection.
The reference voltage stabilizing source of the preferred model TL431 of reference voltage stabilizing source U1, the first bleeder circuit 100 are used for reference voltage stabilizing source
Cathode CU1 partial pressure, sampling end RU1 partial pressure of second bleeder circuit 200 for reference voltage stabilizing source, ON-OFF control circuit 300 uses
In the break-make of control Switching Power Supply, the sampled voltage of reference voltage stabilizing source U1 influences the working condition of ON-OFF control circuit, switch control
The working condition of circuit 300 processed influences the break-make of Switching Power Supply, efficiently avoids the case where inputting overvoltage and input undervoltage
Under, the impaired phenomenon of switching power source device, circuit reaction speed is fast, can accomplish instantaneous protection, Switching Power Supply input voltage
Start to work normally immediately after restoring normal, and is not in restart phenomenon.
More preferably, as a kind of embodiment, the first bleeder circuit 100 include first resistor R1, second resistance R2 and
3rd resistor R3, first resistor R1, second resistance R2 and 3rd resistor R3 series connection, are connected on Switching Power Supply input terminal VDCWith ground connection
Between holding GND, second resistance R2 is series between first resistor R1 and 3rd resistor R3；Second resistance R2 and 3rd resistor R3 phases
The ground terminal of first output end OUT120 of the common end answered as the first bleeder circuit, 3rd resistor R3 are as the first partial pressure electricity
The second output terminal OUT130 on road.
By being rationally arranged the resistance value of first resistor R1, second resistance R2 and 3rd resistor R3, ensure first resistor R1, the
The voltage that two resistance R2 and 3rd resistor R3 get from Switching Power Supply input terminal so that within the scope of normal working voltage, benchmark is steady
Potential source U1 is capable of the operating current of at least general 1mA or so, and when Switching Power Supply input voltage is relatively low, 3rd resistor R3
The voltage got is also low, so that the relatively low trigger triode U2 conductings of triode U2 base stage B voltages, starting protection.
More preferably, as a kind of embodiment, the second bleeder circuit 200 include the 4th resistance R4, the 5th resistance R5 and
6th resistance R6, the 4th resistance R4, the 5th resistance R5 and the 6th resistance R6 series connection, are connected on Switching Power Supply input terminal VDCWith ground connection
Between holding GND, the 5th resistance R5 is series between the 4th resistance R4 and the 6th resistance R6；5th resistance R5 and the 6th resistance R6 phases
First output end OUT220 of the common end answered as the second bleeder circuit；The ground terminal of 6th resistance R6 is as the second partial pressure electricity
The second output terminal OUT230 on road.4th resistance R4, the 5th resistance R5 and the 6th resistance R6 are used for adopting to reference voltage stabilizing source U1
Sample end RU1 is divided, and the resistance value of the 4th resistance R4, the 5th resistance R5 and the 6th resistance R6 is rationally arranged so that defeated in Switching Power Supply
Enter voltage be set highest protect voltage i.e. critical voltage value when, the 6th R6 points of resistance voltage be equal to 2.5V, i.e. base
The voltage of the sampling end RU1 of quasi- source of stable pressure U1 is 2.5V.
More preferably, as a kind of embodiment, ON-OFF control circuit 300 includes the 7th resistance R7, the 8th resistance R8, two
Pole pipe D1 and triode U2；The base stage B of triode U2 connects reference voltage stabilizing source after being sequentially connected in series the 7th resistance R7 and diode D1
The common end corresponding with the cathode CU1 of reference voltage stabilizing source the cathode CU1 of U1, diode D1 as ON-OFF control circuit 300
One input terminal IN310；Wherein, triode U2 is PNP triode.
It is grounded after the 8th resistance R8 of collector C series connection of triode, the ground terminal of the 8th resistance R8 is as switch control electricity
The second input terminal IN320 on road 300；The main control chip energization pins end V of the emitter E connecting valve power supply of triodeCC, three poles
Output end OUT330 of the emitter E of pipe as ON-OFF control circuit.Diode D1 is for preventing Switching Power Supply input voltage high
But when the critical voltage value also not up to protected, 3rd resistor R3 partial pressures are higher to be caused between the base stage of triode and emitter
Voltage VBEIt is excessively high and damage device.
As input voltage VDCWhen in normal range (NR), through the second bleeder circuit 200 to input voltage VDCIt is divided, is made
Obtain the voltage V of reference voltage stabilizing source sampling end RU1RU1Less than 2.5V, since the reference voltage of reference voltage stabilizing source TL431 is 2.5V, because
This, reference voltage stabilizing source TL431 is in cut-off state, the cathode CU1 voltages V of reference voltage stabilizing source TL431CU1It is 3rd resistor R3 points
The voltage value V obtainedR3, the voltage of reference voltage stabilizing source TL431 cathodes CU1 is high level, and PNP type triode U2 is in cut-off state,
The Switching Power Supply input voltage protection circuit is in off position, is had no effect to Switching Power Supply.
As the input voltage V of Switching Power SupplyDCWhen less than critical voltage value, through the second bleeder circuit 200 to input voltage VDC
It is divided, again such that the voltage V of reference voltage stabilizing source sampling end RU1RU1It is in cut-off less than 2.5V, reference voltage stabilizing source TL431
State, but since input voltage is less than critical voltage value, so the voltage that 3rd resistor R3 divides is corresponding also very low, lead to two
Pole pipe D1 conductings, so that the voltage V between the base stage B and emitter E of PNP type triode U2EBIt is in and leads more than 0.7V
Logical state；After PNP type triode U2 conducting, the switching power source chip energization pins end V that is connected with its emitter ECCElectric current
Ground terminal GND is flowed to by PNP type triode U2, so that the voltage V at switching power source chip energization pins endCCIt is pulled low,
VCCAfter being pulled low, Switching Power Supply is stopped, and reduces Switching Power Supply loss, avoids in input undervoltage, during protection
The phenomenon that caused switching power source device damage, and in input voltage VDCAfter restoring normal range (NR), Switching Power Supply starts normally
Work.
As the input voltage V of Switching Power SupplyDCWhen higher than critical voltage value, through the second bleeder circuit to input voltage VDCInto
Row partial pressure, again such that the voltage V of reference voltage stabilizing source sampling end RU1RU1More than 2.5V, reference voltage stabilizing source TL431 is on shape
State, reference voltage stabilizing source TL431 cathode CU1 level are instantaneously pulled to low potential, diode D1 conductings, to influence three pole of positive-negative-positive
The base stage B of pipe U2 is also pulled to low potential, PNP type triode emitter E and switching power source chip energization pins end V simultaneouslyCCElectricity
Connection, PNP type triode U2 conductings, so that the level V at switching power source chip energization pins endCCIt is pulled low, switchs immediately
Power supply is stopped, and there is no switch motions for metal-oxide-semiconductor, and until input voltage restores normal range (NR), Switching Power Supply can just start work
Make, metal-oxide-semiconductor impaired phenomenon when avoiding input overvoltage.
Switching Power Supply input voltage protection circuit provided by the invention passes through the first bleeder circuit and the second bleeder circuit control
The on off state of reference voltage stabilizing source processed, and then the working condition of ON-OFF control circuit is influenced, ON-OFF control circuit passes through itself work
The working condition for making state control switch power supply is switched it efficiently avoids in the case of input overvoltage and input undervoltage
The impaired phenomenon of power supply apparatus, circuit reaction speed is fast, accomplishes immediately to start just after instantaneous protection, input voltage restore normal
Often work, and be not in restart phenomenon.
Several embodiments of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
Cannot the limitation to the scope of the claims of the present invention therefore be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (4)
1. a kind of Switching Power Supply input voltage protection circuit, it is characterised in that：
Including Switching Power Supply input terminal, the first bleeder circuit, the second bleeder circuit, reference voltage stabilizing source and ON-OFF control circuit；
First bleeder circuit is connected in parallel with the second bleeder circuit, the input terminal of first bleeder circuit and described second
The input terminal of bleeder circuit is connect with the Switching Power Supply input terminal respectively；
First output end of first bleeder circuit connects the cathode of the reference voltage stabilizing source, and the of first bleeder circuit
Two output ends connect the anode of the reference voltage stabilizing source and ground connection；
First bleeder circuit includes first resistor, second resistance and 3rd resistor, the first resistor, second resistance and
Three resistance are connected, and are connected between the Switching Power Supply input terminal and ground terminal, and the second resistance is series at first electricity
Between resistance and the 3rd resistor；
The first output end of the second resistance and the corresponding common end of 3rd resistor as first bleeder circuit connects institute
State the cathode of reference voltage stabilizing source, the second output terminal of the ground terminal of the 3rd resistor as first bleeder circuit；
First output end of second bleeder circuit connects the sampling end of the reference voltage stabilizing source, second bleeder circuit
Second output terminal is grounded；
The first input end of the ON-OFF control circuit is connect with the cathode of the reference voltage stabilizing source, the ON-OFF control circuit
Output end is electrically connected with the main control chip energization pins end of the Switching Power Supply, the second input termination of the ON-OFF control circuit
Ground；
Cathode of first bleeder circuit for the reference voltage stabilizing source divides, and second bleeder circuit is used for the benchmark
The sampling end of source of stable pressure divides, and the ON-OFF control circuit is used to control the break-make of the Switching Power Supply, the reference voltage stabilizing source
Sampled voltage influence the working condition of the ON-OFF control circuit, the working condition of the ON-OFF control circuit influence described in open
The break-make in powered-down source；
Second bleeder circuit includes the 4th resistance, the 5th resistance and the 6th resistance, the 4th resistance, the 5th resistance and the
Six resistance are connected, and are connected between the Switching Power Supply input terminal and ground terminal, and the 5th resistance is series at the 4th electricity
Between resistance and the 6th resistance；
The first output end of 5th resistance and the 6th corresponding common end of resistance as second bleeder circuit；
Second output terminal of the ground terminal of 6th resistance as second bleeder circuit.
2. Switching Power Supply input voltage protection circuit according to claim 1, it is characterised in that：
The ON-OFF control circuit includes the 7th resistance, the 8th resistance, diode and triode；
The base stage of the triode is sequentially connected in series the moon that the reference voltage stabilizing source is connected after the 7th resistance and the diode
Pole, first input of the diode common end corresponding with the cathode of the reference voltage stabilizing source as the ON-OFF control circuit
End；
It is grounded after collector series connection the 8th resistance of the triode, the ground terminal of the 8th resistance is as the switch
Second input terminal of control circuit；
The emitter of the triode is connect with the main control chip energization pins end of the Switching Power Supply, the transmitting of the triode
Output end of the pole as the ON-OFF control circuit.
3. Switching Power Supply input voltage protection circuit according to claim 2, it is characterised in that：
The triode is PNP triode.
4. Switching Power Supply input voltage protection circuit according to any one of claims 1 to 3, it is characterised in that：
The model TL431 of the reference voltage stabilizing source.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310466813.5A CN104577993B (en) | 2013-10-09 | 2013-10-09 | Input voltage protection circuit of switching power supply |
| PCT/CN2014/086319 WO2015051688A1 (en) | 2013-10-09 | 2014-09-11 | Protective circuit for input voltage of switch power source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310466813.5A CN104577993B (en) | 2013-10-09 | 2013-10-09 | Input voltage protection circuit of switching power supply |
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| Publication Number | Publication Date |
|---|---|
| CN104577993A CN104577993A (en) | 2015-04-29 |
| CN104577993B true CN104577993B (en) | 2018-11-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310466813.5A Active CN104577993B (en) | 2013-10-09 | 2013-10-09 | Input voltage protection circuit of switching power supply |
Country Status (2)
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| CN (1) | CN104577993B (en) |
| WO (1) | WO2015051688A1 (en) |
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| WO2015051688A1 (en) | 2015-04-16 |
| CN104577993A (en) | 2015-04-29 |
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