CN106100307A - A kind of Switching Power Supply and short-circuit protection method thereof - Google Patents
A kind of Switching Power Supply and short-circuit protection method thereof Download PDFInfo
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- CN106100307A CN106100307A CN201610518907.6A CN201610518907A CN106100307A CN 106100307 A CN106100307 A CN 106100307A CN 201610518907 A CN201610518907 A CN 201610518907A CN 106100307 A CN106100307 A CN 106100307A
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- power supply
- resistance
- short
- switching power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
Abstract
The described Switching Power Supply of the application offer and short-circuit protection method thereof, by power conversion circuit suiting by its internal switching tube, carry out copped wave conversion and power transmission to the input voltage received；When output short-circuit fault occurs in described Switching Power Supply, output short-circuit fault can be quickly detected by short-circuit detecting circuit, generate and output short-circuit detection signal；Generated and output feedback signal according to described short-circuit detection signal by sampling feedback circuit；Again by power supply chip according to described feedback signal, limit the pwm signal of its outfan output extremely described switching tube, it is achieved that the quick execution of short-circuit protection；Until the power supply signal that the power end of power supply chip receives drops to the under-voltage protection point preset, described Switching Power Supply enters hiccup protections pattern, achieves short-circuit protection function reliably；By short-circuit protection rapidly and reliably, when output short-circuit fault occurs in described Switching Power Supply, the stress of described Switching Power Supply Primary Component is effectively inhibited to increase.
Description
Technical field
The present invention relates to switch power technology field, particularly relate to a kind of Switching Power Supply and short-circuit protection method thereof.
Background technology
Switching Power Supply is a kind of AC-DC or DC-DC converting unit, because its efficiency is high, volume is little, reliability is high in industry
Field is extensively applied.Switching Power Supply is many as system supplymentary power supply unit, and stability and the reliability of its work are most important.
In practical work process, the output of Switching Power Supply there will be the abnormal failures such as stream, short circuit and overvoltage, this
Time, the Primary Component (master power switch pipe, secondary rectifier tube) of Switching Power Supply there will be higher stress, is easily caused device and damages
Ruin.When especially Fault of Sudden Short-circuit occurs in the output of Switching Power Supply, because the output electric current of transcient short circuit time Switching Power Supply is very big,
There is higher stress in the Primary Component that can cause Switching Power Supply.
But, Switching Power Supply short-circuit protection method traditional in prior art, mostly there is protection slow the asking of response speed
Topic, the Primary Component in transcient short circuit time Switching Power Supply is still subject to bigger stress, is easily caused the damage of Switching Power Supply.For this
Needing a kind of protection circuit, when power supply is short-circuited, can quickly respond, when reducing fault, Switching Power Supply Primary Component should
Power.
Summary of the invention
In view of this, the invention provides a kind of Switching Power Supply and short-circuit protection method thereof, short-and-medium to solve prior art
The problem that road protection response speed is slow.
To achieve these goals, the technical scheme that the embodiment of the present invention provides is as follows:
A kind of Switching Power Supply, including: power conversion circuit, power supply chip, sampling feedback circuit and short-circuit detecting circuit；Its
In:
The input of described power conversion circuit is the input of described Switching Power Supply；The output of described power conversion circuit
End is the outfan of described Switching Power Supply；Described power conversion circuit suits, to reception for the switching tube internal by it
Input voltage carry out copped wave conversion and power transmission；
The input of described short-circuit detecting circuit is connected with the outfan of described power conversion circuit, for when described switch
When output short-circuit fault occurs in power supply, generate and output short-circuit detection signal；
The first input end of described sampling feedback circuit is connected with the outfan of described power conversion circuit, and described sampling is anti-
Second input of current feed circuit is connected with the outfan of described short-circuit detecting circuit, the feeder ear of described sampling feedback circuit and base
Reference voltage source is connected；Described sampling feedback circuit is used for detecting the output voltage values of described power conversion circuit, and according to described
Short-circuit detection signal generates and output feedback signal；
The feedback end of described power supply chip is connected with the outfan of described sampling feedback circuit；The power supply of described power supply chip
End is connected by the input of the first resistance with described power conversion circuit；The outfan of described power supply chip becomes with described power
The control end changing circuit is connected；Described power supply chip, for according to described feedback signal, limits and opens described in the output extremely of its outfan
Closing the pwm signal of pipe, until the power supply signal that its power end receives drops to the under-voltage protection point preset, described Switching Power Supply is entered
Enter hiccup protections pattern.
Preferably, described short-circuit detecting circuit includes: the first audion, the first electric capacity, the first diode and the second resistance；
Wherein:
The input that one end is described short-circuit detecting circuit of described first electric capacity；
The other end of described first electric capacity and the emitter stage of described first audion and the anode phase of described first diode
Even；
The base stage of described first audion is by described second resistance and the negative electrode of described first diode and described switch
The output ground of power supply is connected；
The outfan of the most described short-circuit detecting circuit of current collection of described first audion.
Preferably, described power conversion circuit is isolated reverse exciting topological, isolated positive activation type topology or non-isolated
Formula BOOST topology.
Preferably, described power conversion circuit is isolated reverse exciting topological, including: transformator, described switching tube, second
Diode and the second electric capacity；Wherein:
The input that different name end is described power conversion circuit of the primary side winding of described transformator；
The Same Name of Ends of the primary side winding of described transformator is connected with the drain electrode of described switching tube；
The source class ground connection of described switching tube；
The grid of described switching tube is the control end of described power conversion circuit；
The Same Name of Ends of the vice-side winding of described transformator is connected with the anode of described second diode；
The negative electrode of described second diode is connected with one end of described second electric capacity, and junction point is described power conversion circuit
Outfan；
The other end of described second electric capacity and the different name end of the vice-side winding of described transformator and described Switching Power Supply defeated
It is connected with going out.
Preferably, also include: benchmark holding circuit；The input of described benchmark holding circuit passes through the 3rd resistance with described
The outfan of power conversion circuit is connected；The outfan of described benchmark holding circuit is connected with described sampling feedback circuit；Described
Benchmark holding circuit, for when output short-circuit fault occurs in described Switching Power Supply, provides for described short-circuit detecting circuit and maintains electricity
Pressure；
Described benchmark holding circuit includes: the 3rd diode, stabilivolt and the 3rd electric capacity；Wherein:
The input that anode is described benchmark holding circuit of described 3rd diode；
The negative electrode of described 3rd diode is connected with one end of the negative electrode of described stabilivolt and described 3rd electric capacity, junction point
Outfan for described benchmark holding circuit；
The anode of described stabilivolt is connected with the other end of described 3rd electric capacity and the output ground of described Switching Power Supply.
Preferably, described sampling feedback circuit includes: the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th
Resistance, controllable accurate source of stable pressure, optocoupler and compensation tache；Wherein:
One end of described 4th resistance is connected with the outfan of described benchmark holding circuit；
The other end of described 4th resistance is connected with one end of the anode of described optocoupler and described 5th resistance；
The other end of described 5th resistance and the negative electrode of described optocoupler, the negative electrode of described controllable accurate source of stable pressure and described benefit
The one end repaying link is connected, and junction point is the input of described sampling feedback circuit；
The other end of described compensation tache and one end of described 6th resistance, one end of described 7th resistance and described controlled
The reference of precision voltage regulator is the most connected；
The output ground of the anode of described controllable accurate source of stable pressure and the other end of described 7th resistance and described Switching Power Supply
It is connected；
The other end of described 6th resistance and the outfan of described power conversion circuit and described short-circuit detecting circuit defeated
Enter end to be connected；
The grounded emitter of described optocoupler；
The colelctor electrode of described optocoupler is connected with one end of described 8th resistance, and junction point is the defeated of described sampling feedback circuit
Go out end；
The other end of described 8th resistance is connected with described reference voltage source.
Preferably, described sampling feedback circuit includes: the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th
Resistance, amplifier chip, optocoupler and compensation tache；Wherein:
One end of described 4th resistance is connected with the outfan of described benchmark holding circuit；
The other end of described 4th resistance is connected with one end of the anode of described optocoupler and described 5th resistance；
The other end of described 5th resistance and the negative electrode of described optocoupler, one end of described compensation tache, described amplifier chip
Outfan be connected, junction point is the input of described sampling feedback circuit；
The other end of described compensation tache and one end of described 6th resistance, one end of described 7th resistance and described amplifier
The inverting input of chip is connected；
The other end of described 7th resistance and the output of described Switching Power Supply it is connected；
The in-phase input end of described amplifier chip receives reference voltage signal；
The other end of described 6th resistance and the outfan of described power conversion circuit and described short-circuit detecting circuit defeated
Enter end to be connected；
The grounded emitter of described optocoupler；
The colelctor electrode of described optocoupler is connected with one end of described 8th resistance, and junction point is the defeated of described sampling feedback circuit
Go out end；
The other end of described 8th resistance is connected with described reference voltage source.
Preferably, described amplifier chip includes: operational amplifier and peripheral RC device；Wherein, described operational amplifier is
Operational amplifier within described power supply chip, or the high speed operation amplifier outside described power supply chip.
Preferably, described power conversion circuit is non-isolated BOOST topology, including: the first inductance, described switching tube,
5th diode and the 4th electric capacity；Wherein:
The input that one end is described power conversion circuit of described first inductance；
The other end of described first inductance is connected with the drain electrode of described switching tube and the anode of described 5th diode；
The source class ground connection of described switching tube；
The grid of described switching tube is the control end of described power conversion circuit；
The negative electrode of described 5th diode is connected with one end of described 4th electric capacity, and junction point is described power conversion circuit
Outfan；
The other end ground connection of described 4th electric capacity.
Preferably, described sampling feedback circuit includes: the 9th resistance, the tenth resistance, the 11st resistance, amplifier chip and benefit
Repay link；Wherein:
Described one end of 9th resistance and the outfan of described power conversion circuit and the input of described short-circuit detecting circuit
End is connected；
The other end of described 9th resistance and one end, one end of described compensation tache and the described amplifier of described tenth resistance
The inverting input of chip is connected；
The other end ground connection of described tenth resistance；
The other end of described compensation tache is connected with one end of the outfan of described amplifier chip and described 11st resistance,
Junction point is the outfan of described sampling feedback circuit；
The in-phase input end of described amplifier chip receives reference voltage signal；
The other end of described 11st resistance is connected with described reference voltage source.
Preferably, described amplifier chip includes: operational amplifier and peripheral RC device；Wherein, described operational amplifier is
Operational amplifier within described power supply chip, or the high speed operation amplifier outside described power supply chip.
Preferably, described reference voltage source is outside the pull-up voltage source on described power supply chip or described Switching Power Supply
Linear stabilized power supply.
The short-circuit protection method of a kind of Switching Power Supply, is applied to Switching Power Supply, and described Switching Power Supply includes: power conversion electricity
Road, power supply chip, sampling feedback circuit and short-circuit detecting circuit；The short-circuit protection method of described Switching Power Supply includes:
When output short-circuit fault occurs in described Switching Power Supply, described short-circuit detecting circuit generates and output short-circuit detection letter
Number；
Described sampling feedback circuit generates and output feedback signal according to described short-circuit detection signal；
Described power supply chip, according to described feedback signal, limits the output of its outfan to described power conversion circuit breaker in middle
The pwm signal of pipe, until the power supply signal that its power end receives drops to the under-voltage protection point preset, described Switching Power Supply enters
Hiccup protections pattern.
Preferably, described Switching Power Supply also includes: benchmark holding circuit；The short-circuit protection method of described Switching Power Supply is in institute
State short-circuit detecting circuit generate and also include before the step of output short-circuit detection signal:
Described benchmark holding circuit provides for described short-circuit detecting circuit and maintains voltage.
The described Switching Power Supply that the application provides, by power conversion circuit suiting by its internal switching tube, docking
The input voltage received carries out copped wave conversion and power transmission；When output short-circuit fault occurs in described Switching Power Supply, by short circuit
Testing circuit can be quickly detected output short-circuit fault, generates and output short-circuit detection signal；By sampling feedback electric circuit inspection institute
State the output voltage values of power conversion circuit, and generate and output feedback signal according to described short-circuit detection signal；Again by power supply
Chip according to described feedback signal, limits the output of its outfan to the pwm signal of described switching tube, it is achieved that short-circuit protection fast
Speed performs；Until the power supply signal that the power end of power supply chip receives drops to the under-voltage protection point preset, described Switching Power Supply
Enter hiccup protections pattern, achieve short-circuit protection function reliably；By short-circuit protection rapidly and reliably, at described switch
When output short-circuit fault occurs in power supply, the stress of described Switching Power Supply Primary Component is effectively inhibited to increase.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Inventive embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to according to
The accompanying drawing provided obtains other accompanying drawing.
The structural representation of a kind of Switching Power Supply that Fig. 1 provides for the application one embodiment；
The circuit diagram of a kind of Switching Power Supply that Fig. 2 provides for another embodiment of the application；
The circuit diagram of another Switching Power Supply that Fig. 3 provides for another embodiment of the application；
The circuit diagram of another Switching Power Supply that Fig. 4 provides for another embodiment of the application；
The flow chart of the short-circuit protection method of a kind of Switching Power Supply that Fig. 5 provides for another embodiment of the application；
The flow chart of the short-circuit protection method of another Switching Power Supply that Fig. 6 provides for another embodiment of the application.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise
Embodiment, broadly falls into the scope of protection of the invention.
The invention provides a kind of Switching Power Supply and short-circuit protection method thereof, to solve short-circuit protection response in prior art
Slow-footed problem.
Concrete, described Switching Power Supply, as it is shown in figure 1, include: power conversion circuit 101, power supply chip 102, sampling are instead
Current feed circuit 103 and short-circuit detecting circuit 104；Wherein:
The input of power conversion circuit 101 is the input of described Switching Power Supply；The outfan of power conversion circuit 101
Outfan for described Switching Power Supply；
The input of short-circuit detecting circuit 104 is connected with the outfan of power conversion circuit 101；
The first input end of sampling feedback circuit 103 is connected with the outfan of power conversion circuit 101, sampling feedback circuit
Second input of 103 is connected with the outfan of short-circuit detecting circuit 104, the feeder ear of sampling feedback circuit 103 and benchmark electricity
Potential source is connected；
The feedback end of power supply chip 102 is connected with the outfan of sampling feedback circuit 103；The power end of power supply chip 102
It is connected with the input of power conversion circuit 101 by the first resistance R1；The outfan of power supply chip 102 and power conversion circuit
The control end of 101 is connected.
Concrete operation principle is:
Power conversion circuit 101 suits for the switching tube internal by it, and the input voltage received is carried out copped wave
Conversion and power transmit；
Short-circuit detecting circuit 104, for when output short-circuit fault occurs in described Switching Power Supply, generates and output short-circuit inspection
Survey signal；
Sampling feedback circuit 103 is used for detecting the output voltage values of power conversion circuit 101, and according to described short-circuit detecting
Signal generates and output feedback signal；
Power supply chip 102 is for according to described feedback signal, limiting the PWM letter of its outfan output extremely described switching tube
Number, until the power supply signal that its power end receives drops to the under-voltage protection point preset, described Switching Power Supply enters hiccup protections
Pattern.
The described Switching Power Supply that the present embodiment provides, by power conversion circuit 101 suiting by its internal switching tube,
The input voltage received is carried out copped wave conversion and power transmission；When output short-circuit fault occurs in described Switching Power Supply, pass through
Short-circuit detecting circuit 104 can be quickly detected output short-circuit fault, generates and output short-circuit detection signal；By sampling feedback circuit
103 generate and output feedback signal according to described short-circuit detection signal；Again by power supply chip 102 according to described feedback signal, limit
Make the pwm signal of its outfan output extremely described switching tube, it is achieved that the quick execution of short-circuit protection；Until the electricity of power supply chip
The power supply signal that source receives drops to the under-voltage protection point preset, and described Switching Power Supply enters hiccup protections pattern, reliably
Achieve short-circuit protection function；By short-circuit protection rapidly and reliably, when there is output short-circuit fault in described Switching Power Supply,
The stress effectively inhibiting described Switching Power Supply Primary Component increases.
In another specific embodiment of the present invention, on the basis of Fig. 1, as shown in Figure 2 or Figure 3, short-circuit detecting circuit
104 include: the first audion Q1, the first electric capacity C1, the first diode D1 and the second resistance R2；Wherein:
The input that one end is short-circuit detecting circuit 104 of the first electric capacity C1；
The other end of the first electric capacity C1 and the anode of the emitter stage of the first audion Q1 and the first diode D1 are connected；
The base stage of the first audion Q1 is by the second resistance R2 and the negative electrode of the first diode D1 and described Switching Power Supply
Output ground SGND is connected；
The outfan of the current collection of the first audion Q1 extremely short-circuit detecting circuit 104.
In concrete actual application, power conversion circuit 101 can be isolated reverse exciting topological, isolated positive activation type
Topological or non-isolated BOOST topology.
When power conversion circuit 101 is isolated topology, the output ground SGND of described Switching Power Supply and described switch electricity
The ground of source input is different；When power conversion circuit 101 be non-isolated topology time, described Switching Power Supply output ground SGND with
The ground of described Switching Power Supply input is connected.
As in figure 2 it is shown, illustrate as a example by power conversion circuit 101 is for isolated reverse exciting topological, it specifically includes:
Transformator T, switching tube Q2, the second diode D2 and the second electric capacity C2；Wherein:
The input that different name end is power conversion circuit 101 of the primary side winding of transformator T；
The Same Name of Ends of the primary side winding of transformator T is connected with the drain electrode of switching tube Q2；
The source class ground connection GND of switching tube Q2；
The grid of switching tube Q2 is the control end of power conversion circuit 101；
The Same Name of Ends of the vice-side winding of transformator T and the anode of the second diode D2 are connected；
The negative electrode of the second diode D2 and one end of the second electric capacity C2 are connected, and junction point is the defeated of power conversion circuit 101
Go out end；
The output ground of the other end of the second electric capacity C2 and the different name end of the vice-side winding of transformator T and described Switching Power Supply
SGND is connected.
Now, as in figure 2 it is shown, described Switching Power Supply also includes: benchmark holding circuit 105；
The input of benchmark holding circuit 105 is connected with the outfan of power conversion circuit 101 by the 3rd resistance R3；Base
The outfan of quasi-holding circuit 105 is connected with sampling feedback circuit 103.
Benchmark holding circuit 105 is for when output short-circuit fault occurs in described Switching Power Supply, for short-circuit detecting circuit 104
There is provided and maintain voltage.
Concrete, benchmark holding circuit 105 is as in figure 2 it is shown, include: the 3rd diode D3, stabilivolt D4 and the 3rd electric capacity
C3；Wherein:
The anode of the 3rd diode D3 is the input of described benchmark holding circuit；
The negative electrode of the 3rd diode D3 is connected with one end of the negative electrode of stabilivolt D4 and the 3rd electric capacity C3, and junction point is described
The outfan of benchmark holding circuit；
The anode of stabilivolt D4 and the output ground SGND of the other end of the 3rd electric capacity C3 and described Switching Power Supply are connected.
Preferably, sampling feedback circuit 103 is as in figure 2 it is shown, include: the 4th resistance R4, the 5th resistance R5, the 6th resistance
R6, the 7th resistance R7, the 8th resistance R8, controllable accurate source of stable pressure U1 (TL431), optocoupler U2 and compensation tache；Wherein:
One end of 4th resistance R4 is connected with the outfan of described benchmark holding circuit；
The other end of the 4th resistance R4 is connected with one end of the anode of optocoupler U2 and the 5th resistance R5；
The other end of the 5th resistance R5 and the negative electrode of optocoupler U2, the negative electrode of controllable accurate source of stable pressure U1 and described compensation tache
One end be connected, junction point is the input of sampling feedback circuit 103；
The other end of described compensation tache and one end of the 6th resistance R6, one end of the 7th resistance R7 and controllable accurate voltage stabilizing
The reference of source U1 is the most connected；
The anode of controllable accurate source of stable pressure U1 and the output ground SGND of the other end of the 7th resistance R7 and described Switching Power Supply
It is connected；
The other end of the 6th resistance R6 and the outfan of power conversion circuit 101 and the input of short-circuit detecting circuit 104
It is connected；
The grounded emitter GND of optocoupler U2；
The colelctor electrode of optocoupler U2 and one end of the 8th resistance R8 are connected, and junction point is the outfan of sampling feedback circuit 103；
The other end of the 8th resistance R8 is connected with reference voltage source Vup.
Reference voltage source Vup can be the pull-up voltage source on power supply chip 102 or the line outside described Switching Power Supply
Property regulated power supply, is not specifically limited, all in the protection domain of the application herein.
Or, sampling feedback circuit 103 is as it is shown on figure 3, include: the 4th resistance R4, the 5th resistance R5, the 6th resistance R6,
7th resistance R7, the 8th resistance R8, amplifier chip U3, optocoupler U2 and compensation tache；Wherein:
One end of 4th resistance R4 is connected with the outfan of described benchmark holding circuit；
The other end of the 4th resistance R4 is connected with one end of the anode of optocoupler U2 and the 5th resistance R5；
The other end of the 5th resistance R5 and the negative electrode of optocoupler U2, one end of described compensation tache, the output of amplifier chip U3
End is connected, and junction point is the input of sampling feedback circuit 103；
The other end of described compensation tache and one end of the 6th resistance R6, one end of the 7th resistance R7 and amplifier chip U3's
Inverting input is connected；
The other end of the 7th resistance R7 is connected with the output ground SGND of described Switching Power Supply；
The in-phase input end of amplifier chip U3 receives reference voltage signal；
The other end of the 6th resistance R6 and the outfan of power conversion circuit 101 and the input of short-circuit detecting circuit 104
It is connected；
The grounded emitter GND of optocoupler U2；
The colelctor electrode of optocoupler U2 and one end of the 8th resistance R8 are connected, and junction point is the outfan of sampling feedback circuit 103；
The other end of the 8th resistance R8 is connected with reference voltage source Vup.
Amplifier chip U3 in Fig. 3 includes: operational amplifier and peripheral RC device；Wherein, described operational amplifier is electricity
Operational amplifier within source chip 102, or the high speed operation amplifier outside power supply chip 102.
When power conversion circuit 101 uses isolated reverse exciting topological to carry out power conversion, by controllable accurate source of stable pressure
Amplifier chip U3 in U1 (TL431 as shown in Figure 2) or Fig. 3 coordinates peripheral circuit composition feedback circuit, by optocoupler U2
Transmission feedback signal CTRL is transferred to the feedback end of power supply chip 102, produce PWM ripple, to drive switching tube Q2 to cut
Ripple；Short-circuit detecting circuit 104 is made up of the first audion Q1, the first electric capacity C1, the first diode D1 and the second resistance R2；When
Described Switching Power Supply occurs when output short-circuit works, and short-circuit detecting circuit 104 can be quickly detected output short-circuit fault, increases light
The forward current of coupling U2 input side diode；And then make the feedback end of power supply chip 102 receive the feedback signal that voltage declines
CTRL, limits the PWM output of power supply chip 102；Benchmark holding circuit 105 is by the 3rd diode D3, stabilivolt D4 and the 3rd electricity
Hold C3 to constitute, when described Switching Power Supply occurs that output short-circuit works, because of the unilateral conduction of the 3rd diode D3, the 3rd electric capacity
Voltage V on C3RefCan be maintained.
Concrete, when described Switching Power Supply normally works, (direction is left by path Vo1 → C1 → D1 for the first electric capacity C1
The negative right side just, the voltage VCB=Vo1 between C point and B point) fully charged by the output of described Switching Power Supply, the first audion Q1 does not leads
Logical, benchmark holding circuit 105 provides voltage reference V for Voltage loopRef。
When output short-circuit fault occurs in described Switching Power Supply, C point voltage declines, due to the both end voltage of the first electric capacity C1
Will not suddenly change, B point voltage is negative relative to the output of described Switching Power Supply ground SGND.Now, the first audion Q1 conducting, its collection
Electric current I is flow through between electrode and emitter stageS1, the forward current of optocoupler U2 input side diode increases, and is passed by optocoupler U2 isolation
Transport to former limit.Primary current Is2 increases, and drags down the voltage of feedback signal CTRL of the feedback end reception of power supply chip 102, quickly
Limit the PWM output of power supply chip 102.Benchmark holding circuit 105 is short-circuit detecting circuit 104 continued power, power supply chip 102
The voltage of feedback signal CTRL that receives of feedback end be persistently pulled low, limit PWM output, until the power supply of power supply chip 102
End Vcc drops to the described chip under-voltage protection point preset, and enters pattern of having the hiccups, finally realizes the fast of power supply output short-circuit fault
Speed reliably protecting.
It addition, the described Switching Power Supply that the present embodiment provides, only increase several simple Devices, such as audion, diode,
Electric capacity and resistance, can realize detection and the protection of above-mentioned short trouble, and fast and reliable performs short-circuit protection function.Circuit structure
Simply, with low cost, easily realize, advantageous for the Switching Power Supply of volume production application.
In another specific embodiment of the present invention, on the basis of Fig. 1, as shown in Figure 4, short-circuit detecting circuit 104 wraps
Include: the first audion Q1, the first electric capacity C1, the first diode D1 and the second resistance R2；Wherein:
The input that one end is short-circuit detecting circuit 104 of the first electric capacity C1；
The other end of the first electric capacity C1 and the emitter stage of the first audion Q1 and the first diode D1 anode be connected；
The base stage of the first audion Q1 is by the second resistance R2 and the negative electrode of the first diode D1 and described Switching Power Supply
Output ground SGND is connected；
The outfan of the current collection of the first audion Q1 extremely short-circuit detecting circuit 104.
Preferably, as shown in Figure 4, when power conversion circuit 101 is non-isolated BOOST topology, described Switching Power Supply
Output ground SGND ground connection GND.Power conversion circuit 101 includes: the first inductance L1, switching tube Q2, the 5th diode D5 and
Four electric capacity C4；Wherein:
The input that one end is power conversion circuit 101 of the first inductance L1；
The other end of the first inductance L1 is connected with the drain electrode of switching tube Q2 and the anode of the 5th diode D5；
The source class ground connection GND of switching tube Q2；
The grid of switching tube Q2 is the control end of power conversion circuit 101；
The negative electrode of the 5th diode D5 and one end of the 4th electric capacity C4 are connected, and junction point is the defeated of power conversion circuit 101
Go out end；
The other end ground connection GND of the 4th electric capacity C4.
Preferably, as shown in Figure 4, sampling feedback circuit 103 includes: the 9th resistance R9, the tenth resistance R10, the 11st electricity
Resistance R11, amplifier chip U3 and compensation tache；Wherein:
One end of 9th resistance R9 and the outfan of power conversion circuit 101 and the input phase of short-circuit detecting circuit 104
Even；
The other end of the 9th resistance R9 and one end of the tenth resistance R10, one end of described compensation tache and amplifier chip U3
Inverting input be connected；
The other end ground connection GND of the tenth resistance R10；
The other end of described compensation tache is connected with the outfan of amplifier chip U3 and one end of the 11st resistance R11, even
Contact is the outfan of sampling feedback circuit 103；
The in-phase input end of amplifier chip U3 receives reference voltage signal；
The other end of the 11st resistance R11 is connected with reference voltage source Vup.
In concrete actual application, amplifier chip U3 includes: operational amplifier and peripheral RC device；Wherein, described fortune
Calculating amplifier is the operational amplifier within power supply chip 102, or the high speed operation amplifier outside power supply chip 102.And
Reference voltage source Vup be on power supply chip 102 pull-up voltage source or described Switching Power Supply outside linear stabilized power supply equal
Can, it is not specifically limited herein.
When power conversion circuit 101 is non-isolated BOOST topology, it is not necessary to light-coupled isolation is transmitted.Reference voltage source Vup is i.e.
Can be that short-circuit detecting circuit provides maintenance voltage.
Concrete, when described Switching Power Supply normally works, (direction is left by path Vo1 → C1 → D1 for the first electric capacity C1
The negative right side just, the voltage VCB=Vo1 between C point and B point) fully charged by the output of described Switching Power Supply, the first audion Q1 does not leads
Logical, reference voltage source Vup can provide voltage reference for Voltage loop by the 11st resistance R11.
When described Switching Power Supply occurs that output short-circuit works, C point voltage declines, due to the first electric capacity C1 both end voltage not
Can suddenly change, B point voltage is negative relative to the output of described Switching Power Supply ground SGND.When described Switching Power Supply short trouble occurs
Time, short-circuit detecting circuit 104 action, the first audion Q1 is conducted through electric current Is, it is not necessary to light-coupled isolation is transmitted, direct drop-down electricity
The voltage of feedback signal CTRL that the feedback end of source chip 102 receives, limits the PWM output of power supply chip 102.Reference voltage source
Vup is short-circuit detecting circuit 104 continued power by the 11st resistance R11, the feedback letter that the feedback end of power supply chip 102 receives
The voltage of number CTRL is persistently pulled low, and limits PWM output, until the power end Vcc of power supply chip 102 drop to preset described
Chip under-voltage protection point, enters pattern of having the hiccups, and finally realizes the fast and reliable protection of power supply output short-circuit fault.
It addition, the described Switching Power Supply that the present embodiment provides, the most only increase several simple Devices, can realize
State the quickly detection of short trouble and protect, simple in construction, with low cost, it is easy to volume production.
Another embodiment of the present invention additionally provides the short-circuit protection method of a kind of Switching Power Supply, is applied to Switching Power Supply, institute
State Switching Power Supply to include: power conversion circuit, power supply chip, sampling feedback circuit and short-circuit detecting circuit；Described Switching Power Supply
Short-circuit protection method as it is shown in figure 5, include:
When output short-circuit fault occurs in described Switching Power Supply, perform step S101, the generation of described short-circuit detecting circuit also
Output short-circuit detection signal；
S102, described sampling feedback circuit generate and output feedback signal according to described short-circuit detection signal；
S103, described power supply chip, according to described feedback signal, limit the output of its outfan to described power conversion circuit
The pwm signal of breaker in middle pipe, until the power supply signal that its power end receives drops to the under-voltage protection point preset, described switch electricity
Source enters hiccup protections pattern.
Preferably, as shown in Figure 6, described Switching Power Supply also includes: benchmark holding circuit；The short circuit guarantor of described Switching Power Supply
Maintaining method also included before step S101:
S100, described benchmark holding circuit provide for described short-circuit detecting circuit and maintain voltage.
Concrete operation principle is same as the previously described embodiments, repeats the most one by one.
In the present invention, each embodiment uses the mode gone forward one by one to describe, and what each embodiment stressed is real with other
Executing the difference of example, between each embodiment, identical similar portion sees mutually.For device disclosed in embodiment
Speech, owing to it corresponds to the method disclosed in Example, so describe is fairly simple, relevant part sees method part explanation
?.
Below it is only the preferred embodiment of the present invention, makes to skilled artisans appreciate that or realize the present invention.Right
The multiple amendment of these embodiments will be apparent to one skilled in the art, as defined herein the most former
Reason can realize without departing from the spirit or scope of the present invention in other embodiments.Therefore, the present invention will not
Be intended to be limited to the embodiments shown herein, and be to fit to consistent with principles disclosed herein and features of novelty
Wide scope.
Claims (14)
1. a Switching Power Supply, it is characterised in that including: power conversion circuit, power supply chip, sampling feedback circuit and short circuit inspection
Slowdown monitoring circuit；Wherein:
The input of described power conversion circuit is the input of described Switching Power Supply；The outfan of described power conversion circuit is
The outfan of described Switching Power Supply；Described power conversion circuit suits for the switching tube internal by it, defeated to receive
Enter voltage and carry out copped wave conversion and power transmission；
The input of described short-circuit detecting circuit is connected with the outfan of described power conversion circuit, for when described Switching Power Supply
When output short-circuit fault occurs, generate and output short-circuit detection signal；
The first input end of described sampling feedback circuit is connected with the outfan of described power conversion circuit, described sampling feedback electricity
Second input on road is connected with the outfan of described short-circuit detecting circuit, the feeder ear of described sampling feedback circuit and benchmark electricity
Potential source is connected；Described sampling feedback circuit is used for detecting the output voltage values of described power conversion circuit, and according to described short circuit
Detection signal generates and output feedback signal；
The feedback end of described power supply chip is connected with the outfan of described sampling feedback circuit；The power end of described power supply chip leads to
Cross the first resistance to be connected with the input of described power conversion circuit；The outfan of described power supply chip and described power conversion electricity
The control end on road is connected；Described power supply chip, for according to described feedback signal, limits the output of its outfan to described switching tube
Pwm signal, until the power supply signal that its power end receives drops to the under-voltage protection point preset, described Switching Power Supply enters and beats
Belch protected mode.
Switching Power Supply the most according to claim 1, it is characterised in that described short-circuit detecting circuit includes: the first audion,
First electric capacity, the first diode and the second resistance；Wherein:
The input that one end is described short-circuit detecting circuit of described first electric capacity；
The other end of described first electric capacity is connected with the anode of the emitter stage of described first audion and described first diode；
The base stage of described first audion is by described second resistance and the negative electrode of described first diode and described Switching Power Supply
Output ground be connected；
The outfan of the most described short-circuit detecting circuit of current collection of described first audion.
Switching Power Supply the most according to claim 1 and 2, it is characterised in that described power conversion circuit is isolated flyback
Formula positive activation type topological, isolated is topological or non-isolated BOOST topology.
Switching Power Supply the most according to claim 1 and 2, it is characterised in that described power conversion circuit is isolated flyback
Formula topology, including: transformator, described switching tube, the second diode and the second electric capacity；Wherein:
The input that different name end is described power conversion circuit of the primary side winding of described transformator；
The Same Name of Ends of the primary side winding of described transformator is connected with the drain electrode of described switching tube；
The source class ground connection of described switching tube；
The grid of described switching tube is the control end of described power conversion circuit；
The Same Name of Ends of the vice-side winding of described transformator is connected with the anode of described second diode；
The negative electrode of described second diode is connected with one end of described second electric capacity, and junction point is the defeated of described power conversion circuit
Go out end；
The output ground of the other end of described second electric capacity and the different name end of the vice-side winding of described transformator and described Switching Power Supply
It is connected.
Switching Power Supply the most according to claim 4, it is characterised in that also include: benchmark holding circuit；Described benchmark maintains
The input of circuit is connected with the outfan of described power conversion circuit by the 3rd resistance；The output of described benchmark holding circuit
End is connected with described sampling feedback circuit；Described benchmark holding circuit is for there is output short-circuit fault when described Switching Power Supply
Time, provide for described short-circuit detecting circuit and maintain voltage；
Described benchmark holding circuit includes: the 3rd diode, stabilivolt and the 3rd electric capacity；Wherein:
The input that anode is described benchmark holding circuit of described 3rd diode；
The negative electrode of described 3rd diode is connected with one end of the negative electrode of described stabilivolt and described 3rd electric capacity, and junction point is institute
State the outfan of benchmark holding circuit；
The anode of described stabilivolt is connected with the other end of described 3rd electric capacity and the output ground of described Switching Power Supply.
Switching Power Supply the most according to claim 5, it is characterised in that described sampling feedback circuit includes: the 4th resistance,
Five resistance, the 6th resistance, the 7th resistance, the 8th resistance, controllable accurate source of stable pressure, optocoupler and compensation tache；Wherein:
One end of described 4th resistance is connected with the outfan of described benchmark holding circuit；
The other end of described 4th resistance is connected with one end of the anode of described optocoupler and described 5th resistance；
The other end of described 5th resistance and the negative electrode of described optocoupler, the negative electrode of described controllable accurate source of stable pressure and described compensation ring
One end of joint is connected, and junction point is the input of described sampling feedback circuit；
The other end of described compensation tache and one end of described 6th resistance, one end of described 7th resistance and described controllable accurate
The reference of source of stable pressure is the most connected；
The other end of the anode of described controllable accurate source of stable pressure and described 7th resistance and the output of described Switching Power Supply it is connected；
The described other end of the 6th resistance and the outfan of described power conversion circuit and the input of described short-circuit detecting circuit
It is connected；
The grounded emitter of described optocoupler；
The colelctor electrode of described optocoupler is connected with one end of described 8th resistance, and junction point is the output of described sampling feedback circuit
End；
The other end of described 8th resistance is connected with described reference voltage source.
Switching Power Supply the most according to claim 5, it is characterised in that described sampling feedback circuit includes: the 4th resistance,
Five resistance, the 6th resistance, the 7th resistance, the 8th resistance, amplifier chip, optocoupler and compensation tache；Wherein:
One end of described 4th resistance is connected with the outfan of described benchmark holding circuit；
The other end of described 4th resistance is connected with one end of the anode of described optocoupler and described 5th resistance；
The other end of described 5th resistance and the negative electrode of described optocoupler, one end of described compensation tache, described amplifier chip defeated
Going out end to be connected, junction point is the input of described sampling feedback circuit；
The other end of described compensation tache and one end of described 6th resistance, one end of described 7th resistance and described amplifier chip
Inverting input be connected；
The other end of described 7th resistance and the output of described Switching Power Supply it is connected；
The in-phase input end of described amplifier chip receives reference voltage signal；
The described other end of the 6th resistance and the outfan of described power conversion circuit and the input of described short-circuit detecting circuit
It is connected；
The grounded emitter of described optocoupler；
The colelctor electrode of described optocoupler is connected with one end of described 8th resistance, and junction point is the output of described sampling feedback circuit
End；
The other end of described 8th resistance is connected with described reference voltage source.
Switching Power Supply the most according to claim 7, it is characterised in that described amplifier chip includes: operational amplifier is with outer
Enclose RC device；Wherein, described operational amplifier is outside the operational amplifier within described power supply chip, or described power supply chip
The high speed operation amplifier in portion.
Switching Power Supply the most according to claim 1 and 2, it is characterised in that described power conversion circuit is non-isolated
BOOST topology, including: the first inductance, described switching tube, the 5th diode and the 4th electric capacity；Wherein:
The input that one end is described power conversion circuit of described first inductance；
The other end of described first inductance is connected with the drain electrode of described switching tube and the anode of described 5th diode；
The source class ground connection of described switching tube；
The grid of described switching tube is the control end of described power conversion circuit；
The negative electrode of described 5th diode is connected with one end of described 4th electric capacity, and junction point is the defeated of described power conversion circuit
Go out end；
The other end ground connection of described 4th electric capacity.
Switching Power Supply the most according to claim 9, it is characterised in that described sampling feedback circuit includes: the 9th resistance,
Tenth resistance, the 11st resistance, amplifier chip and compensation tache；Wherein:
One end of described 9th resistance and the input phase of the outfan of described power conversion circuit and described short-circuit detecting circuit
Even；
The other end of described 9th resistance and one end of described tenth resistance, one end of described compensation tache and described amplifier chip
Inverting input be connected；
The other end ground connection of described tenth resistance；
The other end of described compensation tache is connected with one end of the outfan of described amplifier chip and described 11st resistance, connects
Point is the outfan of described sampling feedback circuit；
The in-phase input end of described amplifier chip receives reference voltage signal；
The other end of described 11st resistance is connected with described reference voltage source.
11. Switching Power Supplies according to claim 10, it is characterised in that described amplifier chip includes: operational amplifier and
Peripheral RC device；Wherein, described operational amplifier is the operational amplifier within described power supply chip, or described power supply chip
Outside high speed operation amplifier.
12. according to the arbitrary described Switching Power Supply of claim 1,6,7 or 10, it is characterised in that described reference voltage source is institute
State the pull-up voltage source on power supply chip or the linear stabilized power supply outside described Switching Power Supply.
The short-circuit protection method of 13. 1 kinds of Switching Power Supplies, it is characterised in that be applied to Switching Power Supply, described Switching Power Supply includes:
Power conversion circuit, power supply chip, sampling feedback circuit and short-circuit detecting circuit；The short-circuit protection method bag of described Switching Power Supply
Include:
When output short-circuit fault occurs in described Switching Power Supply, described short-circuit detecting circuit generates and output short-circuit detection signal；
Described sampling feedback circuit generates and output feedback signal according to described short-circuit detection signal；
Described power supply chip, according to described feedback signal, limits the output of its outfan to described power conversion circuit breaker in middle pipe
Pwm signal, until the power supply signal that its power end receives drops to the under-voltage protection point preset, described Switching Power Supply enters and has the hiccups
Protected mode.
The short-circuit protection method of 14. Switching Power Supplies according to claim 13, it is characterised in that described Switching Power Supply is also wrapped
Include: benchmark holding circuit；The short-circuit protection method of described Switching Power Supply generates and output short-circuit inspection at described short-circuit detecting circuit
Also include before surveying the step of signal:
Described benchmark holding circuit provides for described short-circuit detecting circuit and maintains voltage.
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| CN201610518907.6A CN106100307B (en) | 2016-06-30 | 2016-06-30 | A kind of Switching Power Supply and its short-circuit protection method |
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| CN201610518907.6A CN106100307B (en) | 2016-06-30 | 2016-06-30 | A kind of Switching Power Supply and its short-circuit protection method |
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| CN106655787A (en) * | 2016-11-28 | 2017-05-10 | 北京无线电测量研究所 | Voltage conversion array plane power supply circuit |
| CN107783004A (en) * | 2016-08-30 | 2018-03-09 | 迈普通信技术股份有限公司 | Switching Power Supply product input short-circuit test device and method |
| CN108418186A (en) * | 2018-05-08 | 2018-08-17 | 广州金升阳科技有限公司 | A kind of under-voltage and short-circuit protection circuit of output |
| CN108633142A (en) * | 2018-07-09 | 2018-10-09 | 赛尔富电子有限公司 | A kind of light adjusting circuit of LED light |
| CN109061373A (en) * | 2018-09-28 | 2018-12-21 | 中国船舶重工集团公司第七0七研究所九江分部 | A kind of short-circuit automatic detection circuit device of four terminal potential device signals broken string |
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| CN111725787A (en) * | 2020-07-10 | 2020-09-29 | 广东敏华电器有限公司 | BOOST direct current short-circuit protection circuit that steps up |
| CN114039334A (en) * | 2021-11-05 | 2022-02-11 | 连云港杰瑞电子有限公司 | Converter output short-circuit protection circuit and method without output current sampling |
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