CN105305797B - A kind of DC/DC power supplys output overvoltage under-voltage protecting circuit - Google Patents
A kind of DC/DC power supplys output overvoltage under-voltage protecting circuit Download PDFInfo
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Abstract
The invention discloses a kind of DC/DC power supplys output overvoltage under-voltage protecting circuit, including overvoltage undervoltage detection circuit, feedback circuit, reference power source circuit and metal-oxide-semiconductor；Feedback circuit includes：Normal voltage feedback circuit and over-and under-voltage feedback circuit；The grid of metal-oxide-semiconductor is connected with overvoltage undervoltage detection circuit, and when DC/DC power supplys export normal working voltage, metal-oxide-semiconductor is opened in overvoltage undervoltage detection circuit output, loads normal power supply, while form Voltage Feedback by normal voltage feedback circuit；When DC/DC power supplys occur over-pressed or under-voltage, overvoltage undervoltage detection circuit output shut-off metal-oxide-semiconductor, load power down, Voltage Feedback is formed by over-and under-voltage feedback circuit, DC/DC power supplys keep working under no-load condition in metal-oxide-semiconductor source terminal.The present invention can avoid, because over-and under-voltage frequent starting DC/DC power supplys cause DC/DC power supplys and load damage, improving the reliability of DC/DC power supplys, realizing automatic on-line inspection and switching.
Description
Technical field
The present invention relates to a kind of DC/DC power supplys output overvoltage under-voltage protecting circuit, belong to power technique fields.
Background technology
Existing DC/DC power supplys output overvoltage or under-voltage protecting circuit use hiccup formula protection circuit more, defeated in DC/DC power supplys
When occurring over-pressed or under-voltage, before overvoltage or under-voltage condition release, power supply is all the time in the circulation start, protect, restarting
In, the time, which has been grown, may cause to damage to power module and load equipment.Current more output over-voltage protection device is logical
Shut-off primary controller is crossed come what is realized, permanent shut-down output and two kinds of protection shapes of vibration output pulse during failure when being divided to failure
Formula.Vibration output pulse, constantly causes power supply to restart, produces reliability effect in itself to power supply, it is impossible to which On line inspection is born
Carry failure.
The content of the invention
It is an object of the invention to overcome deficiency of the prior art, there is provided a kind of under-voltage guarantor of DC/DC power supplys output overvoltage
Protection circuit, solving frequent starting DC/DC power supplys under overvoltage in the prior art or under-voltage condition causes power supply and load flimsy
Technical problem, while solve to cause vibration output pulsed over pressure forms of protection to cause DC/DC power supply reliabilities not in the prior art
High technical problem.
In order to solve the above technical problems, the technical solution adopted in the present invention is：A kind of DC/DC power supplys output overvoltage is under-voltage
Protection circuit, including overvoltage undervoltage detection circuit, feedback circuit, the reference electricity that reference voltage is provided for overvoltage undervoltage detection circuit
Source circuit and the metal-oxide-semiconductor being connected between DC/DC power supplys and load；
The feedback circuit includes：Normal voltage feedback circuit and over-and under-voltage feedback circuit；
The grid of the metal-oxide-semiconductor is connected with overvoltage undervoltage detection circuit, when DC/DC power supplys export normal working voltage,
Metal-oxide-semiconductor is opened in overvoltage undervoltage detection circuit output, loads normal power supply, while anti-by normal voltage feedback circuit formation voltage
Feedback；When DC/DC power supplys occur over-pressed or under-voltage, overvoltage undervoltage detection circuit output shut-off metal-oxide-semiconductor, load power down, by overvoltage
Under-voltage feedback circuit forms Voltage Feedback, and DC/DC power supplys keep working under no-load condition in metal-oxide-semiconductor source terminal.
The overvoltage undervoltage detection circuit includes voltage comparator U1A, voltage comparator U1B, triode Q3, triode
Q4, resistance R6, resistance R7, resistance R17 and resistance R18；
Resistance R6 one end is connected with reference voltage output end REF, is grounded after other end series resistance R17；
Resistance R7 one end is connected with DC/DC power output ends VO, is grounded after other end series resistance R18；
The electrical nodes connection that the in-phase input end of the voltage comparator U1A is connected with resistance R6 and resistance R17, it is anti-phase defeated
Enter the electrical nodes connection that end is connected with resistance R7 and resistance R18；
The electrical nodes connection that the in-phase input end of the voltage comparator U1B is connected with resistance R7 and resistance R18, it is anti-phase defeated
Enter end to be connected with reference voltage output end REF；
The output end of the voltage comparator U1A, voltage comparator U1B output end connect with triode Q3 base stage respectively
Connect, triode Q3 grounded emitter, be connected after collector series resistance R16 with power supply VC；
After triode Q4 base stage differential concatenation diode D7, then series resistance R16 is connected with power supply VC, triode Q4's
It is connected after collector series resistance R13, resistance R14 with power supply VO, triode Q4 grounded emitter, resistance R13 and resistance R14
The electrical nodes of connection and the grid G 1 of metal-oxide-semiconductor connect；
When voltage comparator U1A exports low level, while voltage comparator U1B exports high level, show DC/DC power supplys
In overvoltage condition, now triode Q3 conductings, triode Q4 shut-offs, then metal-oxide-semiconductor shut-off, DC/DC power supplys pass through over-and under-voltage
Feedback circuit keeps working under no-load condition in metal-oxide-semiconductor source terminal；
When voltage comparator U1A exports high level, while voltage comparator U1B exports low level, show DC/DC power supplys
In under-voltage condition, now triode Q3 conductings, triode Q4 shut-offs, then metal-oxide-semiconductor shut-off, DC/DC power supplys pass through over-and under-voltage
Feedback circuit keeps working under no-load condition in metal-oxide-semiconductor source terminal；
When voltage comparator U1A exports low level, while voltage comparator U1B also exports low level, show DC/DC electricity
Source exports normal working voltage, and now triode Q3 is turned off, triode Q4 conductings, then metal-oxide-semiconductor turns on, and DC/DC power supplys are load
Power supply.
It is connected after the output end series resistance R3 and diode D5 of the voltage comparator U1A with triode Q3 base stage；
It is connected after the output end series resistance R4 and diode D6 of the voltage comparator U1B with triode Q3 base stage.
Be also associated with rc filter circuit between the base stage and emitter stage of the triode Q3, the rc filter circuit by
Resistance R15, electric capacity the C13 composition being connected in parallel.
The backfeed loop is included by diode D4, resistance R11, resistance R12, three end adjustable shunt reference source V3 and optocoupler
The normal voltage feedback circuit of Q1 compositions, and by diode D3, resistance R9, resistance R11, resistance R12, three end adjustable shunt benchmark
The over-and under-voltage feedback circuit of source V3 and optocoupler Q1 compositions；
The both ends shunt capacitance C15 of the resistance R11, the reference edge and resistance of the three ends adjustable shunt reference source V3
The electrical nodes connection that R12 connects with resistance R11, anode are connected and are grounded with the resistance R12 other end, negative electrode series capacitance C16
Be connected afterwards with resistance R12 and resistance R11 electrical nodes connection, while with after optocoupler Q1 light emitting diode differential concatenation with DC/
The VO connections of D/C power output end；
When three end adjustable shunt reference source V3 reference voltage terminal is higher than setting value, three end adjustable shunt reference source V3 are led
It is logical, optocoupler Q1 lumination of light emitting diode, optocoupler Q1 triode ON, form feedback signal；
When DC/DC power supplys export normal working voltage, i.e., when metal-oxide-semiconductor turns on, normal voltage feedback circuit works；
When DC/DC power supplys are in overvoltage or under-voltage condition, i.e., when metal-oxide-semiconductor turns off, the work of over-and under-voltage feedback circuit,
DC/DC power supplys keep continuing to run with no-load condition in metal-oxide-semiconductor source terminal.
The reference power source circuit includes diode D2, voltage-regulator diode V1, three end adjustable shunt reference source V2, resistance
R1, resistance R2 and resistance R5；Diode D2 anode is connected with DC/DC power supplys, negative electrode series resistance R1, resistance R2 and resistance R5
The output end REF of reference power source circuit is connected afterwards；
Voltage-regulator diode V1 plus earth, negative electrode are connected with resistance R1 and resistance R2 electrical nodes；Voltage-regulator diode V1
Anode and negative electrode between be also associated with the electric capacity C2 and electric capacity C5 that are connected in parallel；
Three end adjustable shunt reference source V2 plus earth, negative electrode and reference edge with resistance R2 and resistance R5 electrical nodes
Connection, shunt capacitance C3 between three end adjustable shunt reference source V2 anode and negative electrode.
The metal-oxide-semiconductor uses p-type metal-oxide-semiconductor.
Compared with prior art, the beneficial effect that is reached of the present invention is：Gone here and there between DC/DC power output ends and load
Join metal-oxide-semiconductor as electronic switch, an output voltage backfeed loop is separately designed at metal-oxide-semiconductor S, D both ends, using over-pressed and under-voltage
Metal-oxide-semiconductor control is realized in sample circuit output, when the output of DC/DC power supplys is normal, metal-oxide-semiconductor conducting, is fed back to using normal voltage
Road, it is ensured that output voltage is accurate；When output voltage appearance is over-pressed or under-voltage, metal-oxide-semiconductor turns off, and now loads unpowered voltage, mistake
Press under-voltage feedback loop starts so that DC/DC power supplys keep working under Light Condition in metal-oxide-semiconductor source terminal, once it is over-pressed
Or under-voltage condition releases, metal-oxide-semiconductor turns on again, and output voltage recovers normal work；The present invention can occur in DC/DC power supplys
Press or switch the circuit to over-and under-voltage feedback circuit automatically when under-voltage, avoid DC/DC power supplys from being in and start, protect, restarting
Evil circulation in, prevent damage DC/DC power supplys, timely and effectively protection load, improve DC/DC power supplys reliability；In DC/DC
During power up to normal working voltage, normal operating conditions can be automatically switched to, automatic on-line inspection and switching is realized, carries
The high operating efficiency of DC/DC power supplys.
Brief description of the drawings
Fig. 1 is DC/DC power supplys and reference power source circuit, feedback circuit and the annexation figure of load.
Fig. 2 is the annexation figure of overvoltage undervoltage detection circuit.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following examples are only used for clearly illustrating the present invention
Technical scheme, and can not be limited the scope of the invention with this.
As shown in figure 1, DC/DC power supply output overvoltage under-voltage protecting circuits, including overvoltage undervoltage detection circuit, feedback electricity
Road, the reference power source circuit that reference voltage is provided for overvoltage undervoltage detection circuit and it is connected between DC/DC power supplys and load
Metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q2 grid are connected with overvoltage undervoltage detection circuit, and as highly preferred embodiment of the present invention, metal-oxide-semiconductor Q2 is adopted
With p-type metal-oxide-semiconductor.Feedback circuit includes：Normal voltage feedback circuit and over-and under-voltage feedback circuit.When DC/DC power supplys export just
During normal operating voltage, metal-oxide-semiconductor Q2 is opened in overvoltage undervoltage detection circuit output, loads normal power supply, while anti-by normal voltage
Current feed circuit forms Voltage Feedback；When DC/DC power supplys occur over-pressed or under-voltage, overvoltage undervoltage detection circuit output shut-off metal-oxide-semiconductor
Q2, load power down, Voltage Feedback is formed by over-and under-voltage feedback circuit, DC/DC power supplys keep unloaded feelings in metal-oxide-semiconductor Q2 source terminals
Worked under condition.
Normal voltage feedback circuit is by diode D4, resistance R11, resistance R12, three end adjustable shunt reference source V3 and optocoupler
Q1 is formed, resistance R11 both ends shunt capacitance C15, three end adjustable shunt reference source V3 reference edge and resistance R12 and resistance
The electrical nodes connection of R11 connections, anode is connected and is grounded with the resistance R12 other end, after negative electrode series capacitance C16 with resistance
The connection of electrical nodes that R12 connects with resistance R11, at the same with it is defeated with DC/DC power supplys after optocoupler Q1 light emitting diode differential concatenation
Go out to hold VO to connect.
Over-and under-voltage feedback circuit is by diode D3, resistance R9, resistance R11, resistance R12, three end adjustable shunt reference sources
V3 and optocoupler Q1 is formed, and is connected after diode D3 negative electrode series resistance R9 with diode D4 negative electrode.
When DC/DC power supplys export normal working voltage, i.e. metal-oxide-semiconductor Q2 is turned on, normal voltage feedback circuit work, when three
End adjustable shunt reference source V3 reference voltage terminal is higher than setting value, three end adjustable shunt reference source V3 conductings, optocoupler Q1 hair
Optical diode lights, optocoupler Q1 triode ON, forms feedback signal.Similarly, when DC/DC power supplys are in over-pressed or under-voltage shape
During state, i.e. when metal-oxide-semiconductor Q2 is turned off, over-and under-voltage feedback circuit work, DC/DC power supplys keep unloaded feelings in metal-oxide-semiconductor Q2 source terminals
Continued to run with condition.
The FB ends connection pulsewidth modulation demodulator of feedback circuit, if DC/DC electric power output voltages are higher than setting value, FB signals
Pulsewidth modulation demodulator output duty cycle is set to diminish so that DC/DC electric power output voltages reach setting value requirement；If DC/DC is electric
Source output voltage is less than setting value, and FB signals make pulsewidth modulation demodulator output duty cycle become big so that DC/DC power supplys output electricity
Pressure reaches setting value requirement.
Reference power source circuit includes diode D2, voltage-regulator diode V1, three end adjustable shunt reference source V2, resistance R1, electricity
Hinder R2 and resistance R5；Diode D2 anode is connected with DC/DC power supplys, is connected after negative electrode series resistance R1, resistance R2 and resistance R5
Meet the output end REF of reference power source circuit.Voltage-regulator diode V1 plus earth, the electrical nodes of negative electrode and resistance R1 and resistance R2
Connection.The electric capacity C2 and electric capacity C5 being connected in parallel are also associated between voltage-regulator diode V1 anode and negative electrode.Three ends are adjustable point
A reference source V2 plus earth is flowed, the electrical nodes of negative electrode and reference edge with resistance R2 and resistance R5 are connected, three end adjustable shunts
Shunt capacitance C3 between a reference source V2 anode and negative electrode.
As shown in Fig. 2 overvoltage undervoltage detection circuit includes voltage comparator U1A, voltage comparator U1B, triode Q3, three
Pole pipe Q4, resistance R6, resistance R7, resistance R17 and resistance R18.Resistance R6 one end is connected with reference voltage output end REF,
It is grounded after other end series resistance R17.Resistance R7 one end is connected with DC/DC power output ends VO, after other end series resistance R18
Ground connection.The connection of electrical nodes that voltage comparator U1A in-phase input end is connected with resistance R6 and resistance R17, inverting input with
The electrical nodes connection that resistance R7 connects with resistance R18.Voltage comparator U1B in-phase input end connects with resistance R7 and resistance R18
The electrical nodes connection connect, inverting input are connected with reference voltage output end REF.Voltage comparator U1A output end, electricity
Base stage of the pressure comparator U1B output end respectively with triode Q3 is connected, triode Q3 grounded emitter, colelctor electrode series electrical
It is connected after resistance R16 with power supply VC.After triode Q4 base stage differential concatenation diode D7, then series resistance R16 and power supply VC connects
Connect, be connected after triode Q4 collector series resistance R13, resistance R14 with power supply VO, triode Q4 grounded emitter, electricity
Resistance R13 and the electrical nodes of resistance R14 connections are connected with metal-oxide-semiconductor Q2 grid G.
Voltage comparator U1A homophase input terminal voltageAnti-phase input terminal voltageVoltage comparator U1B homophase input terminal voltage U1B+=U1A-, anti-phase input terminal voltage U1B-=
UREF, in the absence of voltage comparator U1A, voltage comparator U1B while the situation of high level is exported, below with regard to two voltage comparators
Its excess-three kind for exporting low and high level combines progress analytic explanation：
When voltage comparator U1A exports low level, while voltage comparator U1B exports high level, i.e.,And U1B+=U1A-＞ U1B-=UREFWhen, show that DC/DC power supplys are in overvoltage
State, now triode Q3 conductings, triode Q4 shut-offs, then metal-oxide-semiconductor Q2 shut-offs, DC/DC power supplys pass through over-and under-voltage and feed back electricity
Road keeps working under no-load condition in metal-oxide-semiconductor Q2 source terminals.
When voltage comparator U1A exports high level, while voltage comparator U1B exports low level, i.e.,And U1B+=U1A-＜ U1B-=UREFWhen, show that DC/DC power supplys are in under-voltage
State, now triode Q3 conductings, triode Q4 shut-offs, then metal-oxide-semiconductor Q2 shut-offs, DC/DC power supplys pass through over-and under-voltage and feed back electricity
Road keeps working under no-load condition in metal-oxide-semiconductor Q2 source terminals.
When voltage comparator U1A exports low level, while voltage comparator U1B also exports low level, i.e.,And U1B+=U1A-＜ U1B-=UREFWhen, show that the output of DC/DC power supplys is normal
Operating voltage, now triode Q3 shut-offs, triode Q4 conductings, then metal-oxide-semiconductor Q2 conductings, DC/DC power supplys are load supplying.
It is connected after voltage comparator U1A output end series resistance R3 and diode D5 with triode Q3 base stage.Voltage
It is connected after comparator U1B output end series resistance R4 and diode D6 with triode Q3 base stage.
Rc filter circuit is also associated between triode Q3 base stage and emitter stage, rc filter circuit is by being connected in parallel
Resistance R15, electric capacity C13 composition.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, some improvement and deformation can also be made, these are improved and deformation
Also it should be regarded as protection scope of the present invention.
Claims (6)
1. a kind of DC/DC power supplys output overvoltage under-voltage protecting circuit, it is characterised in that including overvoltage undervoltage detection circuit, feedback
Circuit, the reference power source circuit that reference voltage is provided for overvoltage undervoltage detection circuit and it is connected between DC/DC power supplys and load
Metal-oxide-semiconductor；
The feedback circuit includes：Normal voltage feedback circuit and over-and under-voltage feedback circuit；
The grid of the metal-oxide-semiconductor is connected with overvoltage undervoltage detection circuit, when DC/DC power supplys export normal working voltage, overvoltage
Metal-oxide-semiconductor is opened in undervoltage detection circuit output, loads normal power supply, while form Voltage Feedback by normal voltage feedback circuit；
When DC/DC power supplys occur over-pressed or under-voltage, overvoltage undervoltage detection circuit output shut-off metal-oxide-semiconductor, load power down, by over-and under-voltage
Feedback circuit forms Voltage Feedback, and DC/DC power supplys keep working under no-load condition in metal-oxide-semiconductor source terminal；
The feedback circuit is included by diode D4, resistance R11, resistance R12, three end adjustable shunt reference source V3 and optocoupler Q1 groups
Into normal voltage feedback circuit, and by diode D3, resistance R9, resistance R11, resistance R12, three end adjustable shunt reference source V3
With the over-and under-voltage feedback circuit of optocoupler Q1 compositions；
The both ends shunt capacitance C15 of the resistance R11, three ends adjustable shunt reference source V3 reference edge and resistance R12 and
The electrical nodes connection of resistance R11 connections, anode is connected and is grounded with the resistance R12 other end, after negative electrode series capacitance C16 with electricity
The electrical nodes that connects with resistance R11 of resistance R12 connect, at the same with after optocoupler Q1 light emitting diode differential concatenation with DC/DC power supplys
Output end VO connections；
When three end adjustable shunt reference source V3 reference voltage terminal is higher than setting value, three end adjustable shunt reference source V3 conductings, light
Coupling Q1 lumination of light emitting diode, optocoupler Q1 triode ON, form feedback signal；
When DC/DC power supplys export normal working voltage, i.e., when metal-oxide-semiconductor turns on, normal voltage feedback circuit works；
When DC/DC power supplys are in overvoltage or under-voltage condition, i.e., when metal-oxide-semiconductor turns off, the work of over-and under-voltage feedback circuit, DC/DC
Power supply keeps continuing to run with no-load condition in metal-oxide-semiconductor source terminal.
2. DC/DC power supplys output overvoltage under-voltage protecting circuit according to claim 1, it is characterised in that the overvoltage is owed
Pressure detection circuit includes voltage comparator U1A, voltage comparator U1B, triode Q3, triode Q4, resistance R6, resistance R7, electricity
Hinder R17 and resistance R18；
Resistance R6 one end is connected with reference voltage output end REF, is grounded after other end series resistance R17；
Resistance R7 one end is connected with DC/DC power output ends VO, is grounded after other end series resistance R18；
The electrical nodes connection that the in-phase input end of the voltage comparator U1A is connected with resistance R6 and resistance R17, inverting input
The electrical nodes connection being connected with resistance R7 and resistance R18；
The electrical nodes connection that the in-phase input end of the voltage comparator U1B is connected with resistance R7 and resistance R18, inverting input
It is connected with reference voltage output end REF；
The base stage of the output end of the voltage comparator U1A, voltage comparator U1B output end respectively with triode Q3 is connected,
Triode Q3 grounded emitter, it is connected with power supply VC after collector series resistance R16；
After triode Q4 base stage differential concatenation diode D7, then series resistance R16 is connected with power supply VC, triode Q4 current collection
Pole series resistance R13, resistance R14 are connected with power output end VO, triode Q4 grounded emitter, resistance R13 and resistance R14
The electrical nodes of connection and the grid G of metal-oxide-semiconductor connect；
When voltage comparator U1A exports low level, while voltage comparator U1B exports high level, show that DC/DC power supplys are in
Overvoltage condition, now triode Q3 conductings, triode Q4 shut-offs, then metal-oxide-semiconductor shut-off, DC/DC power supplys are fed back by over-and under-voltage
Circuit keeps working under no-load condition in metal-oxide-semiconductor source terminal；
When voltage comparator U1A exports high level, while voltage comparator U1B exports low level, show that DC/DC power supplys are in
Under-voltage condition, now triode Q3 conductings, triode Q4 shut-offs, then metal-oxide-semiconductor shut-off, DC/DC power supplys are fed back by over-and under-voltage
Circuit keeps working under no-load condition in metal-oxide-semiconductor source terminal；
When voltage comparator U1A exports low level, while voltage comparator U1B also exports low level, show that DC/DC power supplys are defeated
Go out normal working voltage, now triode Q3 is turned off, triode Q4 conductings, then metal-oxide-semiconductor turns on, and DC/DC power supplys are load supplying.
3. DC/DC power supplys output overvoltage under-voltage protecting circuit according to claim 2, it is characterised in that the voltage ratio
It is connected after output end series resistance R3 and diode D5 compared with device U1A with triode Q3 base stage；
It is connected after the output end series resistance R4 and diode D6 of the voltage comparator U1B with triode Q3 base stage.
4. DC/DC power supplys output overvoltage under-voltage protecting circuit according to claim 2, it is characterised in that the triode
Be also associated with rc filter circuit between Q3 base stage and emitter stage, the rc filter circuit by be connected in parallel resistance R15,
Electric capacity C13 is formed.
5. DC/DC power supplys output overvoltage under-voltage protecting circuit according to claim 1, it is characterised in that described with reference to electricity
Source circuit includes diode D2, voltage-regulator diode V1, three end adjustable shunt reference source V2, resistance R1, resistance R2 and resistance R5；Two
Pole pipe D2 anode is connected with DC/DC power supplys, and reference power source circuit is connected after negative electrode series resistance R1, resistance R2 and resistance R5
Output end REF；
Voltage-regulator diode V1 plus earth, negative electrode are connected with resistance R1 and resistance R2 electrical nodes；Voltage-regulator diode V1 sun
The electric capacity C2 and electric capacity C5 being connected in parallel are also associated between pole and negative electrode；
Three end adjustable shunt reference source V2 plus earth, negative electrode and reference edge connect with resistance R2 and resistance R5 electrical nodes
Connect, shunt capacitance C3 between three end adjustable shunt reference source V2 anode and negative electrode.
6. DC/DC power supplys output overvoltage under-voltage protecting circuit according to claim 1, it is characterised in that the metal-oxide-semiconductor is adopted
With p-type metal-oxide-semiconductor.
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