CN108988297A - Hiccup time control circuit and the Switching Power Supply comprising the circuit - Google Patents
Hiccup time control circuit and the Switching Power Supply comprising the circuit Download PDFInfo
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- CN108988297A CN108988297A CN201810996448.1A CN201810996448A CN108988297A CN 108988297 A CN108988297 A CN 108988297A CN 201810996448 A CN201810996448 A CN 201810996448A CN 108988297 A CN108988297 A CN 108988297A
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- 208000031361 Hiccup Diseases 0.000 title claims abstract description 55
- 230000004224 protection Effects 0.000 claims abstract description 43
- 239000003990 capacitor Substances 0.000 claims description 90
- 230000005611 electricity Effects 0.000 claims description 15
- 230000007423 decrease Effects 0.000 claims description 7
- 230000002441 reversible effect Effects 0.000 claims description 3
- 241000208340 Araliaceae Species 0.000 claims description 2
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 claims description 2
- 235000003140 Panax quinquefolius Nutrition 0.000 claims description 2
- 235000008434 ginseng Nutrition 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 abstract 1
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- 238000010586 diagram Methods 0.000 description 5
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- 238000005516 engineering process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
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Classifications
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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
- H02H7/1203—Circuits independent of the type of conversion
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The present invention provides a kind of hiccup time control circuit and the Switching Power Supply comprising the circuit, including trigger circuit, delay circuit, control circuit, compensation level input, control terminal, feeder ear, ground terminal.When switched power output overcurrent or short circuit; level input voltage is compensated to increase; when being increased to the first particular value; trigger circuit output end voltage rapidly goes to low-voltage by high voltage; delay circuit output end voltage is slowly declined by initial high voltage; when delay circuit output voltage drops to the second particular value; control circuit output end is turned off Switching Power Supply by control terminal; by adjusting delay circuit parameter; it can be realized the working time of regulating switch power supply output overcurrent or short-circuit hiccup protections, circuit is simple, at low cost, high reliablity.
Description
Technical field:
The present invention relates to power circuit field, in particular to a kind of hiccup time control circuit and the switch comprising the circuit
Power supply.
Background technique:
Core component of the Switching Power Supply as modern transformation of electrical energy technology has been widely used in and various has used electric field
It closes, can Switching Power Supply safely and steadily run, it is directly related to the even personal safety of circuit safety, equipment safety, therefore
In Switching Power Supply design, protection circuit can all be added usually to ensure the safe and stable operation of power supply.
Switching Power Supply in use, when output power exceeds its rated power, not can guarantee its internal each device
Reliability, therefore output overcurrent protection and output short circuit protection circuit can usually be added to Switching Power Supply in the design process, it beats
The overcurrent protection of belch formula is widely used because having many advantages, such as high reliablity, small power consumption, not influencing to open machine performance.Hiccup formula protection electricity
Road working principle is, when Switching Power Supply opens machine, Switching Power Supply begins with power output, after power supply continues working a period of time,
After if output voltage cannot reach rated output voltage, or output electric current is persistently greater than maximum output current for a period of time, protection
Circuit determines that power work in output overcurrent or output short-circuit state, protects circuit to turn off Switching Power Supply, power supply is no longer at this time
There is power output, protection circuit starts timing, and when protection circuit timing reaches after a certain period of time, protection circuit exits protection shape
The restarting of state, i.e. Switching Power Supply, into next start-up course, completes a hiccup protections period.
To realize Switching Power Supply miniaturization, it is integrated with overcurrent hiccup protections function in many Switching Power Supply control IC, but permitted
The overcurrent hiccup protections time integrated in more IC can not accurately be adjusted, especially high power switching power supply, in overcurrent or short
When the hiccup state of road, internal power device is often damaged because of the working time too long under unbearable hiccup state
Consequence seriously affects the reliability of Switching Power Supply.
Summary of the invention
In view of this, the present invention overcomes the above deficiency, a kind of pass through is provided and adjusts delay circuit parameter, adjusting can be realized
The hiccup time control circuit of the working time of switch power source output overcurrent or short-circuit hiccup protections.
With this corresponding, it is another object of the invention to provide one kind by adjusting delay circuit parameter, and adjusting can be realized
The Switching Power Supply of the working time of switch power source output overcurrent or short-circuit hiccup protections.
In order to achieve the above-mentioned object of the invention, the present invention provides a kind of hiccup time control circuit, including trigger circuit, delay
Circuit and control circuit further include four connection end compensating level inputs, control terminal, feeder ear and ground terminal.
Trigger circuit input terminal connection compensation level input, trigger circuit output end connect delay circuit input terminal, prolong
When circuit output end connect control circuit input terminal, control circuit output end connect control terminal；
When trigger circuit input terminal voltage is greater than the first particular value, trigger circuit output end voltage is become rapidly by high voltage
For low-voltage, on the contrary, trigger circuit output end voltage is by low-voltage when trigger circuit input terminal voltage is less than the first particular value
Rapidly go to high voltage；
When trigger circuit output end voltage rapidly goes to low-voltage by high voltage, delay circuit output end voltage is by initial
High voltage slowly declines, and when dropping to the second particular value, delay circuit output end voltage slowly rises, until restoring to initial height
Voltage；
Control circuit output end is control terminal, and when trigger circuit output end voltage is lower than third particular value, output end is
Low level, when trigger circuit output end voltage is higher than four particular values, output end is high-impedance state.
In brief, a kind of hiccup time control circuit provided by the present invention, including trigger circuit, delay circuit and control
Circuit processed, input terminal of the input terminal of trigger circuit as hiccup protections circuit, the compensation level for connecting control chip are defeated
Enter end, the input terminal of the output end connection delay circuit of trigger circuit, the input of the output end connection control circuit of delay circuit
End, output end of the output end of control circuit as hiccup protections circuit, for connecting the control terminal of control chip；Wherein, it touches
Power Generation Road includes the first voltage-stablizer；Control circuit includes the first operational amplifier；Delay circuit includes being connected to the first operation amplifier
Second capacitor of device normal phase input end and with the concatenated first capacitor of the second capacitor；When trigger circuit input terminal voltage is greater than by the
When the reference voltage of one voltage-stablizer setting, trigger circuit triggers delay circuit makes delay circuit output end voltage pass through the second electricity
Hold the electric discharge to first capacitor and slowly decline, when the end voltage of the second capacitor is lower than the inverting input terminal of the first operational amplifier
When voltage, control circuit output protection controls signal, and control switch power supply stops working；Feeder ear is filled to the second capacitor later
Electricity, when the end voltage of the second capacitor is increased above the inverting input terminal voltage of the first operational amplifier, control circuit revocation
Protection control signal, makes Switching Power Supply start to restart；When trigger circuit input terminal voltage is less than the ginseng set by the first voltage-stablizer
When examining voltage, Switching Power Supply exits guard mode.
Preferably, the trigger circuit includes first resistor, second resistance, 3rd resistor, the first voltage-stablizer, the first pressure stabilizing
Device includes reference end, anode, cathode, connection relationship are as follows: one end of first resistor is the input terminal of trigger circuit, first resistor
The other end connect the reference end of the first voltage-stablizer, the reference end of the first voltage-stablizer is also grounded through second resistance, and feeder ear passes through
3rd resistor connects the cathode of the first voltage-stablizer, the plus earth of the first voltage-stablizer, and the cathode of the first voltage-stablizer is trigger circuit
Output end.
Preferably, the trigger circuit further includes that third capacitor is in parallel with second resistance.
Preferably, the delay circuit includes the 4th resistance, the 5th resistance, first capacitor, the second capacitor, the two or two pole
Pipe, connection relationship are as follows: feeder ear connects the anode of the second diode, the connection power supply of the second diode cathode through the 4th resistance
End, the 5th resistance one end connect the second diode anode, and the 5th resistance other end connects one end of the second capacitor, the second capacitor
Other end ground connection, the second diode anode connect first capacitor one end, and the first capacitor other end is the input terminal of delay circuit, the
The tie point of five resistance and the second capacitor is the output end of delay circuit.
Preferably, the control circuit includes the 6th resistance, the 7th resistance, first diode, the first operational amplifier,
Connection relationship are as follows: the power end of the first operational amplifier connects feeder ear, the power ground ground connection of the first operational amplifier, feeder ear
The inverting input terminal of the first operational amplifier is connected through the 6th resistance, the non-inverting input terminal of the first operational amplifier is through the 7th resistance
Ground connection, the cathode of the output end connection first diode of the first operational amplifier, first diode anode is the defeated of control circuit
Outlet, the non-inverting input terminal of the first operational amplifier are the input terminal of control circuit.
Preferably, the control circuit includes the 6th resistance, the 7th resistance, the 8th resistance, first diode, the first operation
Amplifier, connection relationship are as follows: the power end of the first operational amplifier connects feeder ear, and the power ground of the first operational amplifier connects
Ground, feeder ear connect the inverting input terminal of the first operational amplifier, the non-inverting input terminal of the first operational amplifier through the 6th resistance
Through the 7th resistance eutral grounding, the non-inverting input terminal of the first operational amplifier connects the output of the first operational amplifier through the 8th resistance
End, the cathode of the output end connection first diode of the first operational amplifier, first diode anode is the output of control circuit
End, the non-inverting input terminal of the first operational amplifier are the input terminal of control circuit.
The present invention also provides a kind of Switching Power Supplies using above-mentioned technical proposal, when the increase of switched power output electric current is different
When often or exporting terminal shortcircuit, compensation level input level is increased, and when switch power supply output current reduces, compensation level is inputted
Level is held to reduce；When control circuit output end is low level, Switching Power Supply stops working, when control circuit output end is high resistant
When state, Switching Power Supply is resumed work.
The present invention provides a kind of Switching Power Supply again, comprising above-mentioned hiccup time control circuit, works as switched power output
When overcurrent or short circuit occurs, compensation level input level raises to above protection triggering reference voltage, and trigger circuit triggers are prolonged
When circuit then controlled when the second capacitor of delay circuit is discharged to the inverting input terminal voltage lower than the first operational amplifier
The low level protection of circuit output controls signal, and control switch power supply stops working；Feeder ear gives the second capacitor charging later, when
When the end voltage of second capacitor is increased above the inverting input terminal voltage of the first operational amplifier, control circuit revocation protection control
Signal processed makes Switching Power Supply start to restart, and so constitutes a complete hiccup protections period, is realized and is opened by iterative cycles
The hiccup formula in powered-down source is protected；When Switching Power Supply exits overcurrent or short circuit, compensation level input level decreases below guarantor
Shield triggering reference voltage, control circuit output end is high-impedance state, and Switching Power Supply exits guard mode, automatic to restore to work normally；
Wherein protection triggering reference voltage is set by the internal reference voltage of the first voltage-stablizer of trigger circuit.
The working principle of the invention explanation:
A kind of a kind of hiccup time control circuit of Switching Power Supply, is mainly made of three parts circuit and four terminals: triggering
Circuit, delay circuit, control circuit, compensation level input, control terminal, feeder ear, ground terminal.
In common Switching Power Supply, there is compensation level input Comp (or being expressed as FB) relevant to Voltage loop,
Its feature are as follows: at steady state, compensation level input level is a stable DC voltage, is increased in electric power outputting current
When, compensation level input Comp (or FB) end level increases accordingly, on the contrary when exporting electric current reduction, compensation level input
End Comp (or FB) end level accordingly reduces.
In switched power output overcurrent or short circuit, compensation level input voltage is increased, in first resistor and second
Under the partial pressure effect of resistance, the first voltage-stablizer reference voltage terminal is accordingly increased, when the raising of the first voltage-stablizer reference voltage terminal is supreme
In the inner when portion's reference voltage, the electric current for flowing into the one or three section of voltage-stablizer is increased rapidly, and the electric current flowed through in 3rd resistor is rapid
Increase, 3rd resistor both end voltage increases rapidly, and since 3rd resistor and the first voltage-stablizer cathode are connected in series, acts in its partial pressure
Under, the first voltage-stablizer cathode voltage reduces rapidly, since the voltage at first capacitor both ends cannot be mutated, in the first voltage-stablizer cathode
When voltage becomes low level from high level, the second diode anode voltage also rapidly goes to low level, at this time from feeder ear through
The electric current that the electric current and the second capacitor that four resistance flow into are flowed into through the 5th resistance starts as first capacitor charging, the second diode sun
Pole tension slowly increases；When the second diode anode voltage becomes low level from high level, due to the second capacitor both ends at this time
Voltage be higher than the second diode anode voltage, the charge on the second capacitor is that first capacitor charges through the 5th resistance, and second is electric
The voltage for holding both ends is begun to decline, when the voltage at the second capacitor both ends is decreased below the inverting input terminal of the first operational amplifier
When voltage, the first operational amplifier output terminal voltage becomes low level, and control terminal voltage also accordingly becomes low level from high-impedance state,
Switching Power Supply stops working；When the voltage on the second capacitor is decreased below the second diode anode voltage, feeder ear electric current
The second capacitor is flowed into through the 4th resistance, the 5th resistance, the voltage at the second capacitor both ends starts slowly to increase, is finally increased to and supplies
Electric end voltage is identical.By adjusting first capacitor, the parameter of the second capacitor, the 4th resistance and the 5th resistance, i.e., adjustable second
The descending slope of capacitance voltage, that is, when delay that trigger circuit triggers overcurrent protection is reduced to control terminal output level is adjusted
Between；When the second capacitor both end voltage rises to the inverting input terminal voltage higher than the first operational amplifier, control terminal becomes again
For high-impedance state, Switching Power Supply restarts work.
When switched power output exits overcurrent or short-circuit condition, compensation level input voltage is reduced, in the first electricity
Under the effect of the partial pressure of resistance and second resistance, the first voltage-stablizer reference voltage terminal is accordingly reduced, when the first voltage-stablizer reference voltage terminal
When decreasing below its internal reference voltage, the electric current for flowing into the first voltage-stablizer is reduced rapidly, and flows through the electric current in 3rd resistor
Start to reduce, the charge in first capacitor is consumed through the second diode and 3rd resistor, final first capacitor both end voltage weight
It newly becomes zero, entire time control circuit of having the hiccups completes an overcurrent hiccup protections control.
Beneficial effects of the present invention:
(1) it is high to cross flow point control precision using voltage-stablizer triggering overcurrent or short-circuit protection for circuit.
(2) circuit can be realized the overcurrent hiccup time using a normal operation amplifier and a voltage-stablizer and accurately control
System, circuit are simple, at low cost.
Detailed description of the invention
Fig. 1 is the functional block diagram of present invention hiccup time control circuit；
Fig. 2 is the schematic diagram of first embodiment of the invention hiccup time control circuit；
Fig. 3 is the schematic diagram of second embodiment of the invention hiccup time control circuit.
Specific embodiment
The present invention provides the switch power technology schemes of a kind of hiccup time control circuit and the application circuit, for real
The overcurrent of existing Switching Power Supply or the hiccup formula of short circuit protect control, and feature is overcurrent or short circuit occur using Switching Power Supply
When state, compensation level input Comp voltage can raised characteristic so that trigger circuit works, and pass through delay circuit
Time-lag action makes control circuit export time adjustable control signal, to realize that the Switching Power Supply overcurrent hiccup time is adjustable.?
In Switching Power Supply, there is compensation level input Comp relevant to Voltage loop in conventional control chip and/or voltage is anti-
End FB is presented, because can be used for reflecting whether the output of Switching Power Supply occurs overcurrent it includes there is the current information for flowing through power device
Or short circuit.The detailed description of specific embodiment is now carried out by taking the compensation level terminal Comp for controlling chip as an example.
For the present invention is more clearly understood, with reference to the accompanying drawings and embodiments, the present invention is described in more detail.It answers
When pointing out, the specific embodiments described herein are merely illustrative of the present invention, is not intended to limit the present invention.
First embodiment
It is illustrated in figure 2 the schematic diagram of the present embodiment, a kind of hiccup time control circuit of Switching Power Supply, including triggering electricity
Road, delay circuit and control circuit further include compensation level input Comp, control terminal, feeder ear Vcc and ground terminal.
Trigger circuit includes first resistor R1, second resistance R2,3rd resistor R3, the first voltage-stablizer, the first voltage-stablizer packet
Containing reference end, anode, cathode, connection relationship are as follows: one end of first resistor R1 is the input terminal of trigger circuit, first resistor R1
The other end connect the first voltage-stablizer reference end, the reference end of the first voltage-stablizer also through second resistance R2 connection ground terminal (company
The ground terminal that ground terminal connects control chip is connect, is hereinafter referred to as grounded)；Feeder ear Vcc passes through 3rd resistor R3 connection the
The cathode of one voltage-stablizer, the plus earth of the first voltage-stablizer；The cathode of first voltage-stablizer is the output end of trigger circuit.First is steady
Depressor is preferably three terminal regulator, in the present embodiment, is illustrated for preferably voltage-stablizer TL431.
Delay circuit includes the 4th resistance R4, the 5th resistance R5, first capacitor C1, the second capacitor C2, the second diode D2,
Its connection relationship are as follows: anode of the feeder ear Vcc through the 4th resistance R4 the second diode of connection D2, the connection of the second diode D2 cathode
Feeder ear Vcc, the 5th one end resistance R5 connect the second diode D2 anode, and the 5th resistance R5 other end connects the second capacitor C2
One end, the second capacitor C2 the other end ground connection；Second diode D2 anode connects the one end first capacitor C1, and first capacitor C1 is another
One end is the input terminal of delay circuit；The tie point of 5th resistance R5 and the second capacitor C2 are the output end of delay circuit.
Control circuit includes the 6th resistance R6, the 7th resistance R7, first diode D1, the first operational amplifier AR1,
Connection relationship are as follows: the power end of the first operational amplifier AR1 connects feeder ear Vcc, and the power ground of the first operational amplifier AR1 connects
Ground, inverting input terminal of the feeder ear through the 6th resistance R6 the first operational amplifier of connection AR1, the first operational amplifier AR1's is anti-
Phase input terminal is also grounded through the 7th resistance R7, the cathode of the output end connection first diode D1 of the first operational amplifier AR1, the
One diode D1 anode is the output end of control circuit, and the non-inverting input terminal of the first operational amplifier AR1 is the defeated of control circuit
Enter end.
Trigger circuit input terminal connection compensation level input Comp, trigger circuit output end connect delay circuit input
End, delay circuit output end connect control circuit input terminal, and control circuit output end connects control terminal.Wherein, control terminal is not because
The pin function definition that same chip has is different, can be defined as enabled foot, under-voltage protection foot or current compensation control
Foot etc. is that the foot that Switching Power Supply product can be made to stop output after the level of the foot drags down is ok in a word.
A kind of Switching Power Supply using above-mentioned technical proposal,
When switched power output electric current increases or exports terminal shortcircuit, compensation level input level is increased, and works as switch
Compensation level input level reduces when electric power outputting current reduces.
When control circuit output end is low level, Switching Power Supply stops working, when control circuit output end is high-impedance state
When, Switching Power Supply is resumed work.
Its working principle is that:
Under steady-working state, the compensation level input Comp level of Switching Power Supply is a stable DC voltage,
When electric power outputting current increases, compensation level input Comp end level is increased, on the contrary when exporting electric current reduction, compensation electricity
Flat input terminal Comp end level reduces.
In switched power output overcurrent or short circuit, compensation level input Comp voltage is increased, in first resistor R1
Under the partial pressure effect of second resistance R2, the first voltage-stablizer TL431 reference voltage terminal is increased, when the first voltage-stablizer TL431 is referred to
When end voltage is increased above its internal reference voltage (usually 2.5V), the electric current for flowing into the first voltage-stablizer TL431 increases rapidly
Greatly, the electric current flowed through on 3rd resistor R3 increases rapidly, and 3rd resistor R3 both end voltage increases rapidly, due to 3rd resistor R3 with
First voltage-stablizer TL431 cathode is connected in series, and under the effect of its partial pressure, the first voltage-stablizer TL431 cathode voltage is reduced rapidly, due to
The voltage at the both ends capacitor C1 cannot be mutated, when the first voltage-stablizer TL431 cathode voltage becomes low level from high level, the two or two
Pole pipe D2 anode voltage also rapidly goes to low level, at this time from the feeder ear Vcc electric current flowed into through the 4th resistance R4 and the second electricity
Hold the electric current that C2 is flowed into through the 5th resistance R5 to start to charge for first capacitor C1, the second diode D2 anode voltage slowly increases.
When the second diode D2 anode voltage becomes low level from high level, since the voltage at the second both ends capacitor C2 at this time is higher than the
Two diode D2 anode voltages, charge on the second capacitor C2 are that first capacitor C1 charges through the 5th resistance R5, the second capacitor C2
The voltage at both ends is begun to decline, when the reverse phase that the voltage at the second both ends capacitor C2 is decreased below the first operational amplifier AR1 is defeated
When entering to hold voltage, the first operational amplifier AR1 output end voltage becomes low level, and diode D1 conducting, then control terminal is pulled low
To ground, Switching Power Supply stops working；When the voltage on the second capacitor C2 is decreased below the second diode D2 anode voltage, supply
Electric end Vcc electric current flows into the second capacitor through the 4th resistance R4, the 5th resistance R5, and the voltage at the second both ends capacitor C2 starts slowly
It increases, is finally increased to identical as feeder ear Vcc voltage；It is put when the second capacitor C2 both end voltage rises to higher than the first operation
When the inverting input terminal voltage of big device AR1, the first operational amplifier AR1 output is high level, and diode D1 reversely ends, then controls
End processed becomes high-impedance state again, and Switching Power Supply reopens.The protection duration of hiccup time control circuit of the invention, that is, have the hiccups
Cycle duration by adjusting the parameter of first capacitor C1, the second capacitor C2, the 4th resistance R4 and the 5th resistance R5, i.e., it is adjustable
The descending slope of second capacitor C2 voltage, i.e., adjustable trigger circuit triggers overcurrent protection are prolonged to what control terminal output level reduced
The slow time.And the reference voltage of the circuit is formed by the inherent characteristic parameter of circuit devcie, is not necessarily to external reference voltages, Ji Kejing
Really judge whether the output of Switching Power Supply occurs overcurrent or short circuit.
When switched power output exits overcurrent or short-circuit condition, compensation level input Comp voltage is reduced, the
Under the partial pressure effect of one resistance R1 and second resistance R2, the first voltage-stablizer TL431 reference voltage terminal is accordingly reduced, when the first pressure stabilizing
When device TL431 reference voltage terminal decreases below its internal reference voltage, the electric current for flowing into the first voltage-stablizer TL431 subtracts rapidly
It is small, it flows through the electric current on 3rd resistor R3 and starts to reduce, the charge on first capacitor C1 is through the second diode D2 and 3rd resistor
R3 is consumed, and final first capacitor C1 both end voltage becomes zero again, and Switching Power Supply is automatically restored to normal operating conditions, entirely
The hiccup formula that time control circuit of having the hiccups completes an overcurrent protects control.
Hiccup time control circuit provided by the invention is realized and is had the hiccups interval time under power supply output overcurrent or short-circuit condition
And the working time individually debugs, working time and interval time when being had the hiccups by adjusting are, it can be achieved that prevent Switching Power Supply short circuit from damaging
Bad problem.The circuit be not necessarily to external reference voltages, can accurately judge power supply output whether overcurrent or short circuit.And circuit uses one
Overcurrent hiccup time-modulation can be realized in a normal operation amplifier and voltage-stablizer, and circuit is simple, at low cost.
Second embodiment
It is illustrated in figure 3 the second schematic diagram for applying example, basic functional principle is identical with the first embodiment, the main distinction
It is, trigger circuit increases third capacitor C3, and third capacitor C3 is in parallel with second resistance R2, and control circuit increases by the 8th resistance
R8, the 8th one end resistance R8 connect the non-inverting input terminal of the first operational amplifier AR1, and the resistance R8 other end connects operational amplifier
The output end of AR1.
Its working principle and first embodiment the difference is that: do not enter overcurrent or short-circuit condition in Switching Power Supply
When, the output end of the first operational amplifier AR1 is high level, when Switching Power Supply enters overcurrent or short-circuit condition, the both ends capacitor C2
Voltage slowly declines by high voltage, when the reverse phase that capacitor C2 both end voltage not yet drops to the first operational amplifier AR1 is defeated
When entering to hold voltage, the output end of operational amplifier AR1 is still high level, and the electric current for flowing through resistance R8 can charge to capacitor C2, drop
The decrease speed of low capacitor C2 both end voltage, thus when increasing the starting work of power supply under Switching Power Supply overcurrent hiccup protections state
Between, when capacitor C2 both end voltage is decreased below the inverting input terminal voltage of the first operational amplifier AR1, operational amplifier
The output end of AR1 is low level, and the charge on capacitor C2 can flow into the output end of operational amplifier AR1 by resistance R8, thus
Slow down the rate of climb of capacitor C2 both end voltage, to realize the hiccup time of power supply under Switching Power Supply overcurrent hiccup protections state
Interval.
The above is only the preferred embodiment of the present invention, it is noted that above-mentioned preferred embodiment is not construed as pair
Limitation of the invention, for those skilled in the art, without departing from the spirit and scope of the present invention, also
Several improvements and modifications can be made, these modifications and embellishments should also be considered as the scope of protection of the present invention, no longer uses example here
It repeats, protection scope of the present invention should be defined by the scope defined by the claims..
Claims (10)
1. a kind of hiccup time control circuit, it is characterised in that: including trigger circuit, delay circuit and control circuit,
Input terminal of the input terminal of trigger circuit as hiccup time control circuit, the compensation level for connecting control chip are defeated
Enter end, the output end of trigger circuit connects delay circuit input terminal, and the output end of delay circuit connects control circuit input terminal, control
Output end of the output end of circuit processed as hiccup time control circuit, for connecting the control terminal of control chip；Wherein, it triggers
Circuit includes the first voltage-stablizer；Control circuit includes the first operational amplifier；Delay circuit includes being connected to the first operational amplifier
Second capacitor of normal phase input end and with the concatenated first capacitor of the second capacitor；
When trigger circuit input terminal voltage is greater than the reference voltage set by the first voltage-stablizer, trigger circuit triggers delay electricity
Road declines electric discharge of the delay circuit output end voltage by the second capacitor to first capacitor slowly, when the end of the second capacitor
When voltage is lower than the inverting input terminal voltage of the first operational amplifier, control circuit output protection controls signal, control switch electricity
Source stops working；Feeder ear gives the second capacitor charging later, when the end voltage of the second capacitor is increased above the first operation amplifier
When the inverting input terminal voltage of device, control circuit revocation protection control signal makes Switching Power Supply start to restart；
When trigger circuit input terminal voltage is less than the reference voltage set by the first voltage-stablizer, Switching Power Supply exits protection shape
State.
2. hiccup time control circuit according to claim 1, it is characterised in that: the trigger circuit further includes first
Resistance, second resistance and 3rd resistor, the first voltage-stablizer include reference end, anode and cathode, connection relationship are as follows: first resistor
One end be trigger circuit input terminal, the other end of first resistor connects the reference end of the first voltage-stablizer, the first voltage-stablizer
Reference end is also grounded through second resistance, and feeder ear connects the cathode of the first voltage-stablizer, the yin of the first voltage-stablizer by 3rd resistor
Output end of the pole as trigger circuit, the plus earth of the first voltage-stablizer.
3. hiccup time control circuit according to claim 2, it is characterised in that: the trigger circuit further includes third electricity
Hold, third capacitor is in parallel with second resistance.
4. hiccup time control circuit according to claim 1, it is characterised in that: the delay circuit further includes the 4th electricity
Resistance, the 5th resistance and the second diode, connection relationship are as follows: feeder ear connects the anode of the second diode through the 4th resistance, the
Two diode cathodes connect feeder ear, and the 5th resistance one end connects the second diode anode, the 5th resistance other end connection second
One end of capacitor, the other end ground connection of the second capacitor, the second diode anode connect first capacitor one end, the first capacitor other end
For the input terminal of delay circuit, the tie point of the 5th resistance and the second capacitor is the output end of delay circuit.
5. hiccup time control circuit according to claim 1, it is characterised in that: the control circuit further includes the 6th electricity
Resistance, the 7th resistance and first diode, connection relationship are as follows: the power end of the first operational amplifier connects feeder ear, the first fortune
The power ground end for calculating amplifier is grounded, inverting input terminal of the feeder ear also through the 6th resistance the first operational amplifier of connection, and first
For the inverting input terminal of operational amplifier also through the 7th resistance eutral grounding, the non-inverting input terminal of the first operational amplifier is control circuit
Input terminal, the cathode of the output end connection first diode of the first operational amplifier, first diode anode is control circuit
Output end.
6. hiccup time control circuit according to claim 5, it is characterised in that: the control circuit further includes the 8th electricity
Resistance, one end of the 8th resistance connect the non-inverting input terminal of the first operational amplifier, and the other end of the 8th resistance connects the first operation
The output end of amplifier.
7. a kind of hiccup time control circuit, including trigger circuit, delay circuit and control circuit,
The trigger circuit, including first resistor, second resistance, 3rd resistor and the first voltage-stablizer, the first voltage-stablizer include ginseng
Examine end, anode and cathode, connection relationship are as follows: one end of first resistor be trigger circuit input terminal, first resistor it is another
The reference end of the first voltage-stablizer of end connection, the reference end of the first voltage-stablizer are also grounded through second resistance, and feeder ear passes through third electricity
The cathode of resistance the first voltage-stablizer of connection, output end of the cathode of the first voltage-stablizer as trigger circuit, the anode of the first voltage-stablizer
Ground connection.
The delay circuit, including the 4th resistance, the 5th resistance, first capacitor, the second capacitor and the second diode, connection are closed
System are as follows: feeder ear connects the anode of the second diode through the 4th resistance, and the second diode cathode connects feeder ear, the 5th resistance one
The second diode anode of end connection, the 5th resistance other end connect one end of the second capacitor, and the other end of the second capacitor is grounded, the
Two diode anodes connect first capacitor one end, and the first capacitor other end is the input terminal of delay circuit, the 5th resistance and second
The tie point of capacitor is the output end of delay circuit；
The control circuit, including the 6th resistance, the 7th resistance, first diode and the first operational amplifier, connection relationship
Are as follows: the power end of the first operational amplifier connects feeder ear, the power ground end ground connection of the first operational amplifier, and feeder ear is also through the
Six resistance connect the inverting input terminal of the first operational amplifier, and the inverting input terminal of the first operational amplifier also connects through the 7th resistance
Ground, the non-inverting input terminal of the first operational amplifier are the input terminal of control circuit, the output end connection of the first operational amplifier the
The cathode of one diode, first diode anode are the output end of control circuit.
8. hiccup time control circuit according to claim 7, it is characterised in that: the trigger circuit further includes third electricity
Hold, third capacitor is in parallel with second resistance；The control circuit further includes the 8th resistance, the first fortune of one end connection of the 8th resistance
The non-inverting input terminal of amplifier is calculated, the other end of the 8th resistance connects the output end of the first operational amplifier.
9. hiccup time control circuit according to claim 7 or 8, it is characterised in that: first voltage-stablizer is three ends
Voltage-stablizer.
10. a kind of Switching Power Supply exists comprising hiccup time control circuit, feature described in any one of claims 1 to 9
In:
When overcurrent or short circuit occur for switched power output, compensation level input level raises to above protection triggering reference
Voltage, trigger circuit triggers delay circuit are discharged to the reverse phase lower than the first operational amplifier in the second capacitor of delay circuit
When input terminal voltage, then control circuit exports low level protection and controls signal, and control switch power supply stops working；It powers later
It holds to the second capacitor charging, when the end voltage of the second capacitor is increased above the inverting input terminal voltage of the first operational amplifier
When, control circuit revocation protection control signal makes Switching Power Supply start to restart；
When Switching Power Supply exits overcurrent or short circuit, compensation level input level decreases below protection triggering reference voltage,
Control circuit output end is high-impedance state, and Switching Power Supply exits guard mode, automatic to restore to work normally；Wherein protection triggering reference
Voltage is set by the internal reference voltage of the first voltage-stablizer of trigger circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810996448.1A CN108988297B (en) | 2018-08-29 | 2018-08-29 | Hiccup time control circuit and switching power supply comprising same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810996448.1A CN108988297B (en) | 2018-08-29 | 2018-08-29 | Hiccup time control circuit and switching power supply comprising same |
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| Publication Number | Publication Date |
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| CN108988297A true CN108988297A (en) | 2018-12-11 |
| CN108988297B CN108988297B (en) | 2024-02-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810996448.1A Active CN108988297B (en) | 2018-08-29 | 2018-08-29 | Hiccup time control circuit and switching power supply comprising same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112290512A (en) * | 2020-10-23 | 2021-01-29 | 广州金升阳科技有限公司 | Switch power supply overcurrent protection circuit capable of preventing false triggering |
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| CN2904418Y (en) * | 2006-01-13 | 2007-05-23 | 北京动力源科技股份有限公司 | Primary current limiting circuit for switch power |
| CN102193509A (en) * | 2010-03-01 | 2011-09-21 | 株式会社村田制作所 | Switching control circuit and switching power supply device |
| 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 |
| CN108258656A (en) * | 2018-02-28 | 2018-07-06 | 厦门讯亨电子科技有限公司 | Switching Power Supply overloads delay protection circuit |
| CN208890353U (en) * | 2018-08-29 | 2019-05-21 | 广州金升阳科技有限公司 | Hiccup time control circuit and the Switching Power Supply comprising the circuit |
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2018
- 2018-08-29 CN CN201810996448.1A patent/CN108988297B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2904418Y (en) * | 2006-01-13 | 2007-05-23 | 北京动力源科技股份有限公司 | Primary current limiting circuit for switch power |
| CN102193509A (en) * | 2010-03-01 | 2011-09-21 | 株式会社村田制作所 | Switching control circuit and switching power supply device |
| 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 |
| CN108258656A (en) * | 2018-02-28 | 2018-07-06 | 厦门讯亨电子科技有限公司 | Switching Power Supply overloads delay protection circuit |
| CN208890353U (en) * | 2018-08-29 | 2019-05-21 | 广州金升阳科技有限公司 | Hiccup time control circuit and the Switching Power Supply comprising the circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112290512A (en) * | 2020-10-23 | 2021-01-29 | 广州金升阳科技有限公司 | Switch power supply overcurrent protection circuit capable of preventing false triggering |
| CN112290512B (en) * | 2020-10-23 | 2023-03-14 | 广州金升阳科技有限公司 | Switch power supply overcurrent protection circuit capable of preventing false triggering |
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|---|---|
| CN108988297B (en) | 2024-02-13 |
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