CN104201652B - Power protection control method - Google Patents
Power protection control method Download PDFInfo
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- CN104201652B CN104201652B CN201410458180.8A CN201410458180A CN104201652B CN 104201652 B CN104201652 B CN 104201652B CN 201410458180 A CN201410458180 A CN 201410458180A CN 104201652 B CN104201652 B CN 104201652B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
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- 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
- H02H7/10—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 converters; for rectifiers
- H02H7/12—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 converters; for rectifiers for static converters or rectifiers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention provides a power protection control method and solves the problems such as high power consumption after the power protection is triggered. By the use of the power protection control method, system design is simplified, and delay time of the detection is set without an external capacitor, so that false triggering, caused by starting of the capacitive load, of the short-circuit protection is avoided, and meanwhile, short-circuit break time is long enough to ensure that full radiating of the power supply is achieved after output short circuit. In this way, reliability of the power supply is improved, and rapid starting of the power supply is ensured after fault removing. When the faults except short circuit occur to the power supply, the power supply never enters an intermittent service mode.
Description
Technical field
The present invention relates to a kind of power protection control method.
Background technology
Switching Power Supply has the features such as small volume, lightweight, efficiency high, has been widely used for Industry Control, communication
In the fields such as office, household consumption.But the continuous development with electronic technology, power supply has different technical specifications and index,
Especially various defencive functions, short-circuit protection more receives much attention as most important of which function.
In order to reach short-circuit protection purpose, generally, control IC that the signal related to output end voltage can be detected, and
Judge whether that short-circuit state occurs, to stop output or output drive signal, and a lot of power supplys are by making the confession of control IC at present
Piezoelectric voltage VDD drops to below the threshold value of regulation, even if controlling IC under-voltage stopping output drive signal, thus closing power supply,
Realize short-circuit protection.As shown in figure 1, after power supply output short-circuit, output voltage will be reduced to minimum of a value, IC is controlled to pass through itself
Power consumption drags down the voltage of shunt capacitance C2, so that control IC supply voltage VDD is declined until controlling IC under-voltage, stopping output driving letter
Number；Now whole power-supply system returns to inactive state, and start-up circuit can charge again to shunt capacitance C2, allow and control IC
Restart, output drive signal；If short trouble is not excluded, control IC can drag down shunt capacitance C2 voltage again, return to above-mentioned
Process, power supply discontinuous operation is until short trouble is excluded.Here start-up circuit embodiment has many kinds, as long as meeting in control
Before the supply voltage VDD of IC processed is not up to given threshold, start-up circuit charges to shunt capacitance C2 or does not affect to control IC
Realize under-voltage purpose.
But above-mentioned short-circuit protection control method requires more strictly to the value of shunt capacitance C2, and its value can not be too
Greatly, possibly the parameter indexs such as power supply " starting time ", " startup power consumption " cannot be completed with after start-up circuit cooperation greatly very much, and
And also result in enter short-circuit protection time oversize, short-circuit dissipation is too big；Nor too little, too little if in Power supply belt capacitive
When having loaded machine, may false triggering short-circuit protection；Thus increase the complexity of system design and short-circuit protection performance
Debugging difficulty.
And the development with electronic technology, in order to meet the requirement of higher and higher power supply function index, power supply needs
Integrated multi-protective function, then control IC to be accomplished by stopping output drive signal according to failure condition.Under this background, on
Stating short-circuit protection control method becomes more inapplicable, taking power input under-voltage fault as a example explains below.
When power input under-voltage fault is detected, after controlling IC to stop output drive signal, output voltage will be reduced to
Minimum of a value, similar with above-mentioned situation, the electric discharge of shunt capacitance C2 controls IC normal work to maintain.If input undervoltage fault continues
Between very long, the continuous discharge of shunt capacitance C2 until control IC under-voltage, then when control IC restart after, have one section initialization when
Between, to ensure to control the internal trigger of IC and important node signal can be reset to required initial value.General meeting will
Protection signal is reset to unfaulty conditions to meet specific defencive function requirement, more generally in order to prevent from protecting false triggering,
Each protection module all can built-in one detection time delay, then initialization terminate after, detection time delay in, control IC may export
Drive signal, then in the case of high input voltage, underloading, the output voltage of power supply can rise very high, and power supply cannot meet
The functional parameter of input undervoltage protection.
For the problems referred to above, also there is another kind of modified control method at present, when power supply is powered it is ensured that controlling IC not
On the premise of under-voltage, after output short-circuit fault is detected, by dragging down the electricity of the specific control port of a power supply or control IC
Position, stops output drive signal, closes power supply to realize short-circuit protection.A kind of embodiment of this control method was in 2014
It is discussed in detail in the Chinese patent of Publication No. CN203734296 disclosed in July 23.
Although described modified control method can overcome the contradiction of shunt capacitance C2 value, powered in power supply, control
On the premise of IC processed is not under-voltage, want to drag down a script port be output as high level signal it is necessary to " " extract electric current,
This just essentially can introduce power consumption, and in sum, in the case of the integrated multi-protective function of power supply, this power consumption
Can be applied in all of protected mode, because after trigger protection, the reduction of output voltage can cause short-circuit protection circuit to work.
Particularly, under some high-voltage applications, it is desirable to power-supply system is being not subjected to be struck by lightning such as in some lightning protection power source systems
In the case of, it is in guard mode for a long time；After being struck by lightning, power-supply system starts powering load rapidly, and completing application will
Ask.Now according to above-mentioned protection control method, guard mode triggering above-mentioned modified short-circuit protection circuit work, it is right to lead to
" " extraly extract 1mA about electric current, and under described application, the supply voltage of power-supply system is 220V, and described electricity
Origin system is made up of 100 power supplys using such protection control method, then whole power-supply system is being not subjected to when being struck by lightning
Stand-by power consumption will be up to 22 watts.
Content of the invention
It is an object of the invention to provide a kind of power protection control method, in the every function of power protection of normal realization
Under the premise of, it is to avoid power supply, after trigger protection, brings the big problem of power consumption as above, reduces the complexity of system design simultaneously
Property.
Described output voltage below, if especially not emphasizing, refers to the output end voltage of power supply, and described upset refers to
Low and high level upset or the upset of low high level.
For clearer description power protection control method of the present invention, below by a power protection control
Circuit processed is illustrating.Described power protecting and controling circuit includes a soft-start module, short circuit protection module, a drive
Dynamic device, a narrow-pulse generator, and the first input/output port FB and the first output port GATE.
Further, described short circuit protection module includes the voltage detection module being sequentially connected and count control module, electricity
Pressure detection module is connected to the first described input/output port FB, described voltage detection module detect optical coupler output with defeated
Go out the feedback signal that voltage is associated, judge whether that short-circuit state occurs, output or stopping output short circuit protection signal are extremely described
Count control module, described count control module closes according to the corresponding control signal of State- output of short-circuit protection signal and one
Break signal；
A kind of power protection control method, including a kind of short-circuit protection control method, the step realizing protection control is as follows：
Step one, power supply electrifying, control IC to start；
Step 2, soft-start module control the feedback signal of the first input/output port to start slowly to rise from 0V, power supply
Normal soft start, drive signal dutycycle is slowly increased；
After step 3, soft startup of electric power terminate, the described feedback signal of voltage detection module detection, and by described feedback letter
Number it is compared with reference voltage set in advance, if described feedback signal is higher than described reference voltage, described voltage
Detection module output short circuit protection signal, to count control module, enters step 4, otherwise, not output short circuit protection signal, electricity
Source normal work, starts detection feedback signal again, starts power self test and survey；
Step 4, described count control module receive described short-circuit protection signal, and detection time delay starts timing, judges
Whether described short-circuit protection signal duration exceedes detection time delay, then exports cut-off signals in this way to driver,
Stop output drive signal, close power supply, and the state upset by control signal, enter step 5, otherwise, return to step three；
Step 5, short-circuit time of having a rest start timing, and timing cancels described cut-off signals after finishing, and overturn described again
The state of control signal, the now upset edging trigger narrow-pulse generator of described control signal, described narrow-pulse generator is defeated
Go out burst pulse reset signal to described soft-start module, reset soft start state, drag down described feedback signal；
After step 6, burst pulse duration terminate, described burst pulse reset signal is turned into original state, return to step
Two.
Described on end, if can start to unshorting fault in described detection time delay in described soft startup of electric power,
Then power supply is by fast quick-recovery normal operating conditions, otherwise by the process of repeat step two～six so that power supply discontinuous operation until
Failture evacuation.
Preferably, described power protecting and controling circuit also includes first protection module, edge generator, first defeated
Inbound port VIN and the second input port VDD, described first protection module includes, the input being connected with first input port VIN
The VDD overvoltage protective module that under-voltage protective module is connected with the second input port VDD, both output ends are respectively with first
Be connected with two inputs of door, first with the output end of door respectively with the input of described driver and described edge generator
First input end connects, for exporting a fault-signal.Described input undervoltage protection module can be entered to power source supplying voltage VDC
Row detection, and judge whether that input undervoltage fault state occurs, described VDD overvoltage protective module can detect in assists winding
Voltage, and then indirect detection output voltage, judge whether output overvoltage fault state, if any of the above-described fault occurs,
Described first protection module exports a fault-signal.
Preferably, a kind of power protection control method it is characterised in that：Also include another and protect control method, energy
Enough avoid causing described short-circuit protection control method because the first protection module fault is detected, it realizes the mistake that protection controls
Journey is as follows：
Step A, power supply electrifying, control IC to start；
Step B, the first protection module detect whether faulty generation, if faulty generation is detected, described
One protection module exports a fault-signal and directly turns off driver, and simultaneous faults signal also can be sent to edge generator, make
Edge generator " shielding " falls control signal from count control module, entrance step C；If described first protection module
It is not detected by fault, does not then export fault-signal, output voltage does not set up, optical coupler ends, enter C1 step；
Step C, soft-start module control feedback signal slowly to rise from 0V, if described fault is not excluded, driver is not
Output drive signal, described feedback signal persistently rises, and enters step D；If described failture evacuation, enter step G；
Step D, described feedback signal exceed the reference voltage of setting, then described voltage detection module output short circuit protection
Signal is to count control module, if now described fault is not also excluded, enters step E；Otherwise, enter step G；
Step E, described count control module receive described short-circuit protection signal, and detection time delay starts timing, if institute
State fault to exclude not yet within described detection time delay, then not output drive signal always, detection time delay timing finishes
The state upset of described control signal afterwards, and enter step F；If detection time delay internal fault exclusion, enter step G；
Step F, short-circuit time of having a rest start timing, and timing overturns described control signal after finishing again, if described fault
Exclude not yet, then above-mentioned control signal, still in " shielding " state, return to step D, otherwise, enters step G；
C1, described soft-start module control described feedback signal slowly to rise from 0V, and power supply starts soft start, drives letter
Number dutycycle is slowly increased, and in soft start-up process, described first protection module detects whether faulty generation, if it has, then
Output fault-signal, turns off described driver, stops output drive signal, and the output voltage of power supply declines, described feedback signal
Rise, enter step D；Otherwise, power supply normal work, enters step D1；
After D1, soft startup of electric power terminate, the first protection module detects whether faulty generation, if detecting faulty
Raw, then export fault-signal, turn off driver, stop output drive signal, the output voltage of power supply declines, on feedback signal
Rise, enter step D；If the first protection module does not detect that fault occurs, whether voltage detection module detection feedback signal
More than reference voltage, if feedback signal is less than reference voltage, voltage detection module not output short circuit protection signal, power supply is normal
Work, enters E1 step；If feedback signal is more than reference voltage, voltage detection module output short circuit protection signal is given and is counted control
Molding block, enters E2 step；
E1, power supply normal work, described first protection module detects whether faulty generation, if do not detected, returns
Step D1；If detecting fault to occur, fault-signal will be exported, directly turning off driver, stop output drive signal, with
Shi Suoshu fault-signal also can be sent to edge generator, " shielding " above-mentioned control signal, after stopping output drive signal, power supply
Output voltage decline, described feedback signal rise, enter step D；
E2, count control module receive short-circuit protection signal, and detection time delay starts timing, if when detection postpones
Interior, the first protection module detects fault and occurs, then export fault-signal, turns off driver, stops output drive signal, inspection
Survey time delay and continue timing, timing enters step F after finishing；If fault is not detected within detection time delay to occur,
Judge whether short-circuit protection signal duration exceedes detection time delay, if short-circuit protection signal duration is more than detection
Time delay, then count control module export cut-off signals to driver, stop output drive signal, close power supply, and
By the state upset of control signal, enter step F1, otherwise return to step D1；
F1, short-circuit time of having a rest start timing, if within the short-circuit time of having a rest, the first protection module detects fault and sends out
Raw, then the first protection module output fault-signal, the short-circuit time of having a rest continues timing, and timing overturns again after finishing and controls letter
Number, enter step D；Otherwise as above-mentioned short-circuit protection control method, revocation after short-circuit time of having a rest timing finishes turns off letter
Number, overturn control signal again, enter step G；
Step G, edge generator export an edge signal, trigger narrow-pulse generator, described narrow-pulse generator output
Burst pulse reset signal, to soft-start module, resets soft start state, drags down feedback signal；
After step H, burst pulse reset signal duration terminate, described burst pulse reset signal is turned into original state,
Power supply self- recoverage, return to step B.
Further, described detection time delay and short-circuit time of having a rest are that count control module is set in advance, institute
The short-circuit time of having a rest stated is to start timing after described detection time delay timing terminates.
Further, described fault can be input undervoltage fault or output overvoltage fault, can also be and draw
The special circumstances such as the hanging fault of pin, as long as the first protection module output fault-signal can be triggered, and then cause short circuit protection module
Work, its control method is all similar with the present invention, comes under scope of the presently claimed invention.
Further, the described burst pulse reset signal duration is default by described narrow-pulse generator, with
Ensure that described soft-start module can reset completely.
Described on end, the present invention has the advantage that and effect：
1st, power protection control method reliability is high, applied widely it is not necessary to external electric capacity can achieve that detection postpones
The setting of time, effectively avoids band capacitive load and starts false triggering short-circuit protection, when having sufficiently long short circuit rest simultaneously
Between to guarantee that power supply can fully radiate after output short-circuit, improve the reliability of power supply.
2nd, the time parameter of above-mentioned protection will not be affected by ambient parameters such as shunt capacitances, is easy to debug, reduction system sets
The complexity of meter.
3rd, when power supply is short-circuited fault, cut-off signals are produced by digital circuits such as count control module, directly turn off
Driver, stops output drive signal, and this shutoff mode will not persistently extract electric current, not introduce extra power consumption；
4th, described fault-signal also can directly turn off driver, is not affected it is ensured that working as power supply by described cut-off signals
There is other faults in addition to short trouble, such as input undervoltage fault, lead to output voltage to reduce and cause short-circuit protection electricity
During the work of road, power supply will not discontinuous operation so that in input undervoltage, the quiescent dissipation of power supply drops further compared with prior art
Low；
5th, increase the control circuits such as narrow-pulse generator, realize only before power supply needs again soft start, dragging down feedback letter
Number, power supply power consumption short-circuit protection time in is greatly decreased, and then reduces the power consumption in power supply each discontinuous operation cycle；
6th, the control circuits such as edge generator are increased it is ensured that working as power supply other faults in addition to short trouble to occur, such as
Input undervoltage fault, when leading to output voltage to reduce and causing short-circuit protection circuit work, between described feedback signal will not occur
Formula of having a rest low and high level shakes, and reduces unnecessary power consumption.
Brief description
Fig. 1 is using the circuit diagram controlling IC feeder ear to realize short-circuit protection in prior art；
Fig. 2 is the application circuit of the control IC applying power protection control method of the present invention；
Fig. 3 is the theory diagram of the power protecting and controling circuit described in the embodiment of the present invention one
Fig. 4 is the theory diagram of the power protecting and controling circuit described in the embodiment of the present invention two；
Fig. 5 is the theory diagram of short circuit protection module in power protecting and controling circuit of the present invention；
Fig. 6 is the theory diagram of the first protection module in power protecting and controling circuit of the present invention；
Fig. 7 is the theory diagram of driver in power protecting and controling circuit of the present invention；
The flow chart of power protection control method in Fig. 8 embodiment of the present invention one；
Fig. 9 is the signal schematic representation of the embodiment of the present invention one；
Figure 10 is the signal schematic representation of the embodiment of the present invention two；
Figure 11 is the flow chart of power protection control method in the embodiment of the present invention three；
Figure 12 is the signal schematic representation of the embodiment of the present invention three.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with drawings and Examples, right
The present invention further describes.It should be appreciated that specific embodiment described herein is only in order to explain the present invention, and without
In the restriction present invention.
Embodiment one
The present embodiment is to be proposed based on the application of Fig. 2, is applied in the off-line type anti exciting converter of opto-coupled feedback.As figure
Shown in 2, the first input/output port FB of IC2 is controlled to be connected shape with the pin 3 of first electric capacity C1 one end and optical coupler PC1 respectively
Become a node A, control the feedback signal VFB of IC2 to be transferred to FB port by node A；First input port VIN is passed through
First resistor R1 is connected with power source supplying voltage VDC, for real-time detection power source supplying voltage VDC；Second input port VDD is
The feeder ear of described control IC2, vdd terminal mouth respectively with one end of the second electric capacity C2, the output end of linear power supply and the two or two pole
Pipe D2 negative electrode connects, and described linear power supply includes first resistor R2, the first voltage-stabiliser tube ZD1, the first transistor Q1 and the one or two pole
Pipe D1 it is seen that when assists winding cannot to controlling IC2 power when, in the case that power supply is powered, the second electric capacity C2 and described line
Property power supply be able to maintain that control IC2 normal power supply；3rd input port CS is electric with the first NMOS tube M1 source electrode and the 4th respectively
Resistance R4 one end connects, for the former limit peak point current of each switch periods of sampling, to control IC input sample signal；Second input
Output port SS is connected with one end of the 3rd electric capacity C3, for arranging the soft startup of electric power time；3rd input/output port RI with
One end of 3rd resistor R3 connects, for arranging onboard clock frequency；4th input/output port GND connects a reference potential, such as
" " current potential；First output port GATE is connected with the first NMOS tube M1 grid, and output drive signal controls the first NMOS tube M1
On off state.
As shown in Fig. 2 those skilled in the art is known that feedback signal VFB described in the present embodiment and output
It is that contact is set up by devices such as optical coupler PC1 and TL431 between voltage.It can be seen that, the pin of optical coupler PC1 3 and described the
One input/output port FB connects, pin 4 with " " current potential is connected, when power supply exports normal, TL431 will be by resistance R5 and R6
The sampled value of the output voltage that partial pressure the obtains reference voltage built-in with TL431 is compared, and obtains an error signal, described
Error signal is converted into described feedback signal VFB through optical coupler PC1 and is conveyed to the first input/output port FB.It can be seen that, described
Feedback signal VFB relevant with loop parameter setting, those skilled in the art can be set up by simple loop design
Described feedback signal VFB and the exact link of output voltage, the present invention repeats no more this principle.
As shown in figure 3, power protecting and controling circuit includes soft-start module 1, short circuit protection module 2, driver 4, narrow arteries and veins
Rush generator 6, and the first input/output port FB, the 3rd input port CS and the first output port GATE.Described burst pulse
The trigger condition of generator 6 is arranged to " rising edge triggering " in embodiment one.
As shown in figure 5, short circuit protection module 2 includes the voltage detection module 21 being sequentially connected and count control module 22,
Voltage detection module 21 detection feedback signal VFB, judges whether short-circuit state, exports or stop output short circuit protection signal
To described count control module 22, count control module 22 is according to the corresponding control signal of State- output of short-circuit protection signal
Ctrl and cut-off signals；
As shown in fig. 7, driver 4 includes second and door 41, level shift circuit 42, buffer 43, PWM modulator 44.
It will be appreciated by those skilled in the art that, the driver 4 of the present embodiment is simplest drive circuit, wherein level shift circuit
42nd, buffer 43 is powered by the second input port VDD controlling IC, usually controls two maximum submodules of IC power consumption.PWM
Two inputs of modulator 44 are connected with feedback signal VFB and the 3rd input port CS respectively, and PWM modulator 44 will feed back signal
The sampled signal that VFB is inputted with the 3rd input port CS is compared, and exports a pulse-width signal Drive to second and door 41
First input end, described cut-off signals are connected with the second input of door 41 with second, second with the output end of door 41 and electricity
The input of translational shifting circuit connects；Level shift circuit 42 is sequentially connected with buffer 43, is believed by buffer 43 output driving
Number；If described cut-off signals are that high level is invalid, pulse-width signal Drive can control level shift circuit 42, and then
Buffer 43 is allowed to export the drive signal GATE with pulse-width signal Drive homophase.
It will be appreciated by those skilled in the art that, when described cut-off signals are Low level effective, no matter second and door 41
First input end pulse-width signal Drive be which kind of level, second with door 41 all can export low level turn off level move
Position circuit 42, and then turn off buffer 43, stop output drive signal GATE, that is, described cut-off signals be the low level time
Interior, drive signal GATE is low level, then as shown in Fig. 2 the first NMOS tube M1 is off state so that the 3rd input port
CS input sampled signal be low level (in the present embodiment be " " level), feedback signal VFB be higher than described sampled signal,
The pulse-width signal Drive of PWM modulator 44 output is fixed level (being high level in the present embodiment).Therefore turning off letter
Number for Low level effective when, no one of whole driver 4 signal occur low and high level vibration, electric current will not be extracted, do not produce
Raw power consumption.
The fault-signal Fault hereafter submitting to and described cut-off signals with imitating, second with door 41 can have more one the 3rd defeated
Enter end to be connected with fault-signal Fault, " turn off driver 4 " mentioned below, " direct shutoff driver 4 " all representatives be on
State turn off process, driver no longer produces power consumption, hereafter repeat no more above-mentioned principle.
Fig. 8 is the flow chart of short-circuit protection control method in the present embodiment one, and it is as follows that it realizes the process of protection control：
Step one, power supply electrifying, control IC to start；
Step 2, soft-start module 1 control the feedback signal VFB of the first input/output port FB to start slow from 0V
Rise, the normal soft start of power supply, drive signal dutycycle is slowly increased；
After step 3, maximum soft-start time T1 terminate, voltage detection module 21 detects described feedback signal VFB, instead
Feedback signal VFB is associated with output voltage, and described feedback signal VFB is carried out with controlling reference voltage V ref setting in IC
Relatively, if power supply occurs output short-circuit fault, output voltage is too low, falls the operating point TL431 so that optical coupler ends,
Do not extract electric current, so that feedback signal VFB is higher than reference voltage V ref, export a short-circuit protection signal to tally control mould
Block 22, enters step 4；If feedback signal VFB is less than reference voltage V ref then it represents that power supply does not occur output short-circuit event
Barrier, power supply enters normal operating conditions, starts detection feedback signal again, starts power self test and survey；
Step 4, count control module 22 receive short-circuit protection signal, and detection time delay T2 starts timing, if in T2
Time internal short-circuit failture evacuation, short-circuit protection signal eliminates, then return to step three；After the T2 time terminates, described feedback signal
VFB is still above reference voltage V ref, and short trouble is not excluded, and count control module 22 exports cut-off signals to driver
4, shutoff driver 4, stop output drive signal, close power supply, and will be the control signal of high level after controlling IC to start
The state of Ctrl is turned into low level, enters step 5；As shown in figure 9, the schematic diagram for each signal after short trouble generation；
Obviously in described detection time delay T2, described driver 4 has drive signal to export, and Power supply belt so can be avoided to hold
Property has loaded false triggering short-circuit protection during machine；
Step 5, short-circuit time of having a rest T3 start timing, and timing cancels described cut-off signals after finishing, again will be described
The state of control signal Ctrl is turned into high level, and the rising edge energizing signal of control signal Ctrl now meets described narrow arteries and veins
Rush the trigger condition of generator 6, it is extremely described soft that described narrow-pulse generator 6 sends low level burst pulse reset signal RST
Starting module 1, resets soft start state, drags down described feedback signal VFB, the low level of this burst pulse reset signal RST
Duration is T4, and in the present embodiment, setting time is 290ns, to ensure that soft-start module 1 can reset completely, by feedback letter
Number VFB be pulled low to " " current potential is it is ensured that soft-start time is consistent with design load；This short-circuit time of having a rest T3 needs long enough,
As 1.6s, to guarantee that power supply can fully radiate after output short-circuit, improve the reliability of power supply；
Step 6, after the T4 time, described burst pulse reset signal RST is turned into high level, return to step two.
It can be seen that after maximum soft-start time T1 terminates again, voltage detection module 21 starts detection feedback signal again
VFB, if within the T1+T2 time, excludes output short-circuit fault, then power supply self- recoverage, starts normal work；Otherwise, on repeating
State short-circuit protection process, so that power supply service intermittent, until short trouble exclusion.
It can be seen that fully dragging down feedback signal VFB in the T4 time before power supply needs soft start, further reduce when electricity
Source be short-circuited fault when, the power supply power consumption in short-circuit protection time T3, and then decrease power supply each discontinuous operation cycle
Interior power consumption.
Above-mentioned time parameter is all set by count control module 22 it is not necessary to external electric capacity, and in the present embodiment
In application, the linear power supply of Fig. 2 is able to maintain that the normal power supply controlling IC2, and control IC2 will not be under-voltage, therefore shunt capacitance etc.
Ambient parameters do not interfere with the setting of above-mentioned time parameter, greatly reduce the requirement to shunt capacitance value, are easy to debug, subtract
The complexity of mini system design.
Embodiment two
From unlike embodiment one：Also include another and protect control method, it can be avoided that because of the first protection module
Fault is detected and cause described short-circuit protection control method.As shown in figure 4, power protecting and controling circuit increased first with
Not gate 5, the first protection module 3, first input port VIN and the second input port VDD.The first of described first NAND gate 5 is defeated
The fault-signal Fault entering end with the output of described first protection module 3 is connected, the second input and described short circuit protection module 2
Control signal Ctrl of output connects, and output end is connected with the input of described narrow-pulse generator 6, in embodiment two, institute
The trigger condition stating narrow-pulse generator 6 is arranged to trailing edge triggering.
As shown in fig. 6, the first described protection module 3 include the input undervoltage protection module 32 being connected with port VIN and
The VDD overvoltage protective module 33 being connected with port VDD, both output ends are connected with two inputs of first and door 31 respectively
Connect, first is connected with driver 4 with door 31 output end, for exporting fault-signal Fault.Input undervoltage protection module 32 is permissible
Power source supplying voltage VDC is detected, and judges whether that input undervoltage fault state occurs, VDD overvoltage protective module 33 can
To detect the voltage in assists winding, and then indirect detection output voltage, and judge whether that output overvoltage fault state occurs, if
Any of the above-described fault there is, then the first protection module 3 output fault-signal Fault, fault-signal Fault Low level effective.
A kind of power protecting and controling circuit, also includes another and protects control method, it can be avoided that because of the first protection mould
Block detects fault and causes described short-circuit protection control method, and then avoids power supply discontinuous operation, and it realizes protection process
Step as follows：
Step A, power supply electrifying, control IC to start；
Step B, the first protection module 3 are not detected by fault, do not export fault-signal Fault, output voltage does not set up,
Optical coupler ends, and enters C1 step；
C1, described soft-start module 1 control described feedback signal VFB slowly to rise from 0V, and power supply starts soft start, drive
Dynamic signal dutyfactor is slowly increased, and in soft start-up process, the first protection module 3 detects whether faulty generation, if there are then exporting
Fault-signal fault, turns off driver 4, stops output drive signal, and output voltage declines, and feedback signal VFB rises, and enters
Step D；If fault is not detected to occur, normal soft start, enter D1 step；
After D1, soft startup of electric power terminate, the first protection module detects whether that fault occurs, if detecting faulty
Raw, then export fault-signal Fault, turn off driver, stop output drive signal, output voltage declines, feedback signal rises,
Enter step D；If the first protection module is not detected by fault occurred, voltage detection module 21 can detect feedback signal
Whether VFB is more than reference voltage V ref, if feedback signal VFB is less than reference voltage V ref, optical coupler PC1 can extract electric current,
Voltage detection module 21 will not output short circuit protection signal, power supply normal work, enter E1 step；If signal VFB is big for feedback
In reference voltage V ref, voltage detection module output short circuit protection signal, to counter module, enters E2 step；
E1, power supply normal work, the first protection module 3 detects whether faulty generation, if do not detected, returns step
Rapid D1；If detecting fault to occur, such as input undervoltage fault, described fault-signal Fault, i.e. fault-signal will be exported
Fault is low level, directly turns off above-mentioned driver 4, stops output drive signal, and described fault-signal Fault also can simultaneously
It is sent to the first input end of the first NAND gate 5, " shielding " above-mentioned control signal Ctrl, after stopping output drive signal, export
Voltage declines, and described feedback signal VFB rises, and enters step D；
E2, count control module receive short-circuit protection signal, and detection time delay T2 starts timing, if in the T2 time
Interior, the first protection module detects fault and occurs, then export fault-signal Fault, turns off driver, stops output driving letter
Number, detection time delay T2 continues timing, and the state of above-mentioned control signal Ctrl is turned into low level after finishing by timing, enters
Step F；If fault is not detected within detection time delay to occur, it is judged as whether the short-circuit signal duration exceedes detection
Time delay T2, if short-circuit protection signal duration is more than T2, short circuit protection module exports cut-off signals to drive
Dynamic device, stops output drive signal, closes power supply, and the state of control signal is overturn as low level, entrance step from high level
Rapid F1, otherwise return to step D1；
F1, short-circuit time of having a rest T3 start timing, if within the T3 time, the first protection module detects fault and occurs,
Then the first protection module output fault-signal Fault, short-circuit time of having a rest T3 continue timing, timing finish after by control signal
Ctrl is overturn as high level, entrance step D by low level；Cut-off signals are cancelled, control signal is by low after otherwise T3 timing finishes
Level overturns as high level, entrance step G；
Step D, described voltage detection module 21 detect the reference voltage that described feedback signal VFB exceedes setting
Vref, then voltage detection module 21 output short circuit protection signal is to count control module 22, and now described input undervoltage fault is still
Do not exclude, enter step E；If input undervoltage failture evacuation, fault-signal Fault overturns as high level from low level, enters
Enter step G；
Step E, detection time delay T2 start timing, and such as within the T2 time, input undervoltage fault is not still excluded, always
Not output drive signal, the state that timing finishes rear above-mentioned control signal Ctrl is turned into low level, and enters step F；If defeated
Enter under-voltage fault to eliminate, then fault-signal Fault overturns as high level, entrance step G from low level；
Step F, short-circuit time of having a rest T3 start timing, and above-mentioned control signal Ctrl is turned into height after finishing by timing again
Level, if described input undervoltage fault is excluded not yet, above-mentioned control signal Ctrl " shielding ", above-mentioned narrow-pulse generator 6
Above-mentioned burst pulse reset signal RST will not be sent, soft-start module 1 will not reset, feedback signal VFB is continuously high level, no
Extra power consumption, return to step D can be caused；If input undervoltage failture evacuation in the T3 time, fault-signal Fault is from low level
Overturn as high level, entrance step G；
Step G, described fault-signal Fault are high level (high level is disarmed state), and the second of the first NAND gate 5 is defeated
Enter control signal Ctrl that end reception has been high level, therefore now the first NAND gate 5 output trailing edge signal Edge, meet institute
State the trigger condition of narrow-pulse generator 6, described narrow-pulse generator 6 exports burst pulse reset signal RST and soft opens to described
Dynamic model block 1, resets soft start state, drags down described feedback signal VFB；
After step H, time T4 terminate, described burst pulse reset signal RST is turned into high level, power supply self- recoverage, returns
The detection process of step B.
The meaning " shielding " in the present invention is it should be construed to：Using the feature of NAND gate, when arbitrary input of NAND gate
After receiving low level, no matter which kind of level the signal of another input of NAND gate is, NAND gate all only can export high level,
It is equivalent to be the signal shielding another input, so to describe this spy of NAND gate in literary composition using " shielding " one word
Property, such as when the first input end of the first NAND gate 5 referring in literary composition receives fault-signal Fault for low level, " shielding "
Control signal Ctrl that second input receives, no matter which kind of level is control signal Ctrl be, the first NAND gate 5 can only export
High level.
As shown in Figure 10, in step F return to step D, proceed to step E, before above-mentioned time T2 timing finishes, input undervoltage
Fault is excluded, and fault-signal Fault is flipped to high level, enters step G, after experience step H, power supply self- recoverage, and start
Normal work.
In sum it is apparent that：
1st, preset a detection time delay T2, power supply with capacitance load can be effectively prevented from and play false triggering short circuit during machine
Protection, and this detection time delay T2, after maximum soft-start time T1, just starts timing when producing short-circuit protection signal,
The ability with capacitive load can be strengthened by suitably increasing maximum soft-start time T1；
2nd, in order in the application of Fig. 2, realize the function of power supply fast self-recovery after failture evacuation, also to ensure simultaneously
Power supply can fully radiate in short-circuit protection, improves the reliability of power supply, the short-circuit time of having a rest T3 of setting one, within the T3 time
No drive signal output, can be greatly decreased short-circuit dissipation, allow power supply fully to radiate；
3rd, in order to avoid in direct or indirect triggering short-circuit protection mode of operation, dragging down opto-coupled feedback signal for a long time
VFB causes power consumption, adds a narrow-pulse generator 6, and changes control logic accordingly, realizes only needing soft start in power supply
Fully drag down feedback signal VFB in the front T4 time, while meeting power supply indices, reduce further under guard mode
Power consumption.
Embodiment three
From unlike embodiment two：Power supply electrifying, after controlling IC to start, the first protection module has been detected by an event
Barrier, it realizes protecting the process controlling as follows as shown in figure 11：
Step A, power supply electrifying, control IC to start；
Step B, the first protection module 3 detect input undervoltage fault, and output fault-signal Fault directly turns off driver
4, simultaneously described fault-signal Fault also can be sent to the first input end of the first NAND gate 5, " shielding " first NAND gate 5
Control signal Ctrl of the second input, enters step C；If the first protection module 3 does not check fault, enter and implement
Example two identical mode of operation；
Step C, described soft-start module 1 control described feedback signal VFB slowly to rise from 0V, described input undervoltage event
Barrier is not excluded, driver 4 not output drive signal, and described feedback signal VFB persistently rises, and maximum soft-start time T1 terminates
Afterwards, enter step D；If input undervoltage failture evacuation, fault-signal Fault overturns as high level, entrance step from low level
Rapid G；
Step D, described voltage detection module 21 detect the reference voltage that described feedback signal VFB exceedes setting
Vref, voltage detection module 21 output short circuit protection signal to count control module 22, now described input undervoltage fault is not also
Exclusion, enters step E；If input undervoltage failture evacuation, fault-signal Fault overturns as high level, entrance from low level
Step G；
Step E, detection time delay T2 start timing, and such as within the T2 time, input undervoltage fault is not still excluded, always
Not output drive signal, the state that timing finishes rear above-mentioned control signal Ctrl is turned into low level, and enters step F；If defeated
Enter under-voltage fault to eliminate, then fault-signal Fault overturns as high level, entrance step G from low level；
Step F, short-circuit time of having a rest T3 start timing, and above-mentioned control signal Ctrl is turned into height after finishing by timing again
Level, if described input undervoltage fault is excluded not yet, above-mentioned control signal Ctrl " shielding ", above-mentioned narrow-pulse generator 6
Above-mentioned burst pulse reset signal RST will not be exported, soft-start module 1 will not reset, feedback signal VFB is continuously high level, no
Extra power consumption, return to step D can be caused；If input undervoltage failture evacuation in the T3 time, fault-signal Fault is from low level
Overturn as high level, entrance step G；
Step G, described fault-signal Fault are high level (high level is disarmed state), and the second of the first NAND gate 5 is defeated
Enter control signal Ctrl that end reception has been high level, therefore now the first NAND gate 5 output trailing edge signal Edge, meet institute
State the trigger condition of narrow-pulse generator 6, described narrow-pulse generator 6 exports burst pulse reset signal RST and soft opens to described
Dynamic model block 1, resets soft start state, drags down described feedback signal VFB；
After step H, time T4 terminate, described burst pulse reset signal RST is turned into high level, power supply self- recoverage, again
The detection process of return to step B.
As shown in figure 12, if input undervoltage fault is excluded after the 2nd T3 timing terminates not yet, input undervoltage fault
Duration is more than 2 (T2+T3), and therefore said process has circulated twice between step D～F, in the 3rd time T2, defeated
Enter under-voltage fault to be excluded, fault-signal Fault is flipped to high level, enter step G, after experience step H, power supply is from extensive
Answer, soft start again, power supply does not occur output short-circuit simultaneously, and soft start terminates rear power supply and starts normal work.
Embodiments of the present invention not limited to this are although above-described embodiment is applied to opto-coupled feedback flyback power supply converter
In, it is to be understood that present invention can apply in the more extensive scope of other, such as can be according to practical situations, the
Increase the hanging protection module of pin, triggering form of modification control signal etc. in one protection module.For the art
For those of ordinary skill, according to the above of the present invention, using ordinary technical knowledge and the customary means of this area, not
Under the premise of departing from the present invention above-mentioned basic fundamental thought, the present invention can also make modification, replacement or the change of other various ways
More, as the effective status of change signal, or logic is done with simple replacement, be such as substituted for NAND gate by first with door, by event
Barrier signal be set to that high level is effective or rising edge effectively etc., these all should belong to the thought of the present invention, all falls within the present invention
Within rights protection scope.
Claims (4)
1. a kind of power protection control method it is characterised in that：Including a kind of short-circuit protection control method, it is realized protection and controls
Step as follows：
Step one, power supply electrifying, control IC to start；
Step 2, soft-start module control the feedback signal of the first input/output port to start slowly to rise from 0V, and power supply is normal
Soft start, drive signal dutycycle is slowly increased；
After step 3, soft startup of electric power terminate, the described feedback signal of voltage detection module detection, and by described feedback signal with
Reference voltage set in advance is compared, if described feedback signal is higher than described reference voltage, described voltage detecting
Module output short circuit protection signal, to count control module, enters step 4, otherwise, not output short circuit protection signal, power supply is just
Often work, start detection feedback signal again, start power self test and survey；
Step 4, described count control module receive described short-circuit protection signal, and detection time delay starts timing, judge described
Whether short-circuit protection signal duration exceedes detection time delay, then exports cut-off signals in this way to driver, stops
Output drive signal, closes power supply, and the state upset by control signal, enters step 5, otherwise, return to step three；
Step 5, short-circuit time of having a rest start timing, and timing cancels described cut-off signals after finishing, overturn described control again
The state of signal, the now upset edging trigger narrow-pulse generator of described control signal, described narrow-pulse generator output is narrow
Pulse reset signal, to described soft-start module, resets soft start state, drags down described feedback signal；
After step 6, burst pulse duration terminate, described burst pulse reset signal is turned into original state, return to step two.
2. power protection control method according to claim 1 it is characterised in that：Also include another and protect controlling party
Method, it can be avoided that cause described short-circuit protection control method because the first protection module fault is detected, it realizes protection control
The step of system is as follows：
Step A, power supply electrifying, control IC to start；
Step B, the first protection module detect whether faulty generation, if faulty generation is detected, described first guarantor
Shield module exports a fault-signal and directly turns off driver, and simultaneous faults signal also can be sent to edge generator so that side
Fall the control signal from count control module along generator " shielding ", enter step C；If described first protection module does not have
Fault is detected, then do not export fault-signal, output voltage does not set up, optical coupler ends, enter C1 step；
Step C, soft-start module control feedback signal slowly to rise from 0V, if described fault is not excluded, driver does not export
Drive signal, described feedback signal persistently rises, and enters step D；If described failture evacuation, enter step G；
Step D, described feedback signal exceed the reference voltage of setting, then described voltage detection module output short circuit protection signal
To count control module, if now described fault is not also excluded, enter step E；Otherwise, enter step G；
Step E, described count control module receive described short-circuit protection signal, and detection time delay starts timing, if described event
Barrier is excluded within described detection time delay not yet, then not output drive signal always, and detection time delay timing finishes rear institute
State the state upset of control signal, and enter step F；If detection time delay internal fault exclusion, enter step G；
Step F, short-circuit time of having a rest start timing, and timing overturns described control signal after finishing again, if described fault is not yet
Exclude, then above-mentioned control signal, still in " shielding " state, return to step D, otherwise, enters step G；
C1, described soft-start module control described feedback signal slowly to rise from 0V, and power supply starts soft start, and drive signal accounts for
Empty ratio is slowly increased, and in soft start-up process, described first protection module detects whether faulty generation, if it has, then exporting
Fault-signal, turns off described driver, stops output drive signal, and the output voltage of power supply declines, and described feedback signal rises,
Enter step D；Otherwise, power supply normal work, enters step D1；
After D1, soft startup of electric power terminate, the first protection module detects whether faulty generation, if faulty generation is detected,
Then export fault-signal, turn off driver, stop output drive signal, the output voltage of power supply declines, and feedback signal rises, and enters
Enter step D；If the first protection module does not detect that fault occurs, whether voltage detection module detection feedback signal is more than base
Quasi- voltage, if feedback signal be less than reference voltage, voltage detection module not output short circuit protection signal, power supply normal work,
Enter E1 step；If feedback signal is more than reference voltage, voltage detection module output short circuit protection signal is to tally control mould
Block, enters E2 step；
E1, power supply normal work, described first protection module detects whether faulty generation, if do not detected, return to step
D1；If detecting fault to occur, fault-signal will be exported, directly turning off driver, stop output drive signal, institute simultaneously
State fault-signal and also can be sent to edge generator, " shielding " above-mentioned control signal, stop output drive signal after, power supply defeated
Go out voltage to decline, described feedback signal rises, and enters step D；
E2, count control module receive short-circuit protection signal, and detection time delay starts timing, if in detection time delay
Interior, the first protection module detects fault and occurs, then export fault-signal, turns off driver, stops output drive signal, detection
Time delay continues timing, and timing enters step F after finishing；If fault is not detected within detection time delay to occur, sentence
Whether disconnected short-circuit protection signal duration exceedes detection time delay, if short-circuit protection signal duration prolongs more than detection
The late time, then count control module export one cut-off signals to driver, stop output drive signal, close power supply, and general
The state upset of control signal, enters step F1, otherwise return to step D1；
F1, short-circuit time of having a rest start timing, if within the short-circuit time of having a rest, the first protection module detects fault and occurs,
Then the first protection module output fault-signal, the short-circuit time of having a rest continues timing, and timing overturns control signal again after finishing, enters
Enter step D；Otherwise as above-mentioned short-circuit protection control method, short-circuit time of having a rest timing cancels cut-off signals after finishing, then
Secondary upset control signal, enters step G；
Step G, edge generator export an edge signal, trigger narrow-pulse generator, and described narrow-pulse generator exports narrow arteries and veins
Rush reset signal to soft-start module, reset soft start state, drag down feedback signal；
After step H, burst pulse reset signal duration terminate, described burst pulse reset signal is turned into original state, power supply
Self- recoverage, return to step B.
3. power protection control method according to claim 1 and 2 it is characterised in that：Described detection time delay and
The short-circuit time of having a rest is default by described count control module, and the described short-circuit time of having a rest is when described detection postpones
Between timing terminate after start timing.
4. power protection control method according to claim 2 it is characterised in that：Described burst pulse reset signal continues
Time is default by described narrow-pulse generator, can be resetted completely with the soft-start module ensureing described.
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| CN201410458180.8A CN104201652B (en) | 2014-09-10 | 2014-09-10 | Power protection control method |
| PCT/CN2015/084177 WO2016037511A1 (en) | 2014-09-10 | 2015-07-16 | Power supply protection and control method |
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| CN101997423A (en) * | 2010-10-29 | 2011-03-30 | 广州金升阳科技有限公司 | Self-oscillating flyback converter with function of output short circuit protection |
| CN102280861A (en) * | 2011-08-01 | 2011-12-14 | 广州金升阳科技有限公司 | Output short-circuit protection circuit of switching power supply |
| CN203734296U (en) * | 2013-11-01 | 2014-07-23 | 欧姆龙株式会社 | Power supply short circuit protection circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104201652A (en) | 2014-12-10 |
| WO2016037511A1 (en) | 2016-03-17 |
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