CN105262055A - Overcurrent protection circuit with adjustable intermittent time - Google Patents

Overcurrent protection circuit with adjustable intermittent time Download PDF

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Publication number
CN105262055A
CN105262055A CN201510543502.3A CN201510543502A CN105262055A CN 105262055 A CN105262055 A CN 105262055A CN 201510543502 A CN201510543502 A CN 201510543502A CN 105262055 A CN105262055 A CN 105262055A
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CN
China
Prior art keywords
resistance
unit
connects
pin
timers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201510543502.3A
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Chinese (zh)
Inventor
余晓鹏
石光
韩伟
吴春红
刘磊
孔圣立
赵文沛
马伟东
杨海晶
李斌
时晨
张峰
乔利红
蔡得雨
王懿
周鑫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Henan Electric Power Co Ltd
Original Assignee
State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Henan Electric Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by State Grid Corp of China SGCC, Electric Power Research Institute of State Grid Henan Electric Power Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN201510543502.3A priority Critical patent/CN105262055A/en
Publication of CN105262055A publication Critical patent/CN105262055A/en
Pending legal-status Critical Current

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Abstract

The invention discloses an overcurrent protection circuit with adjustable intermittent time. The overcurrent protection circuit comprises a current detection unit, a reference voltage unit, a comparison unit, a delay trigger unit and a master control chip unit, wherein output ends of the current detection unit and the reference voltage unit are connected with an input end of the comparison unit; the output end of the comparison unit is connected with the input end of the delay trigger unit; and the output end of the delay trigger unit is connected with the input end of the master control chip unit. According to the overcurrent protection circuit, overcurrent and short-circuit protection functions of a PWM control chip are expanded; the overcurrent protection circuit can be applied to a plurality of switching power circuits, such as a single-ended circuit, a symmetric circuit and the like, with topological structures; the overcurrent protection circuit is convenient to adjust, safe and reliable; the power loss in an overcurrent protection process of a power supply is effectively reduced; and the reliability of a switching power supply is improved.

Description

The current foldback circuit of a kind of adjustable intermittent time
Technical field
The present invention relates to the current protection technology field of Switching Power Supply, particularly relate to the current foldback circuit of a kind of adjustable intermittent time.
Background technology
Switching Power Supply utilizes modern power electronics technology, the time ratio that control switch pipe turns on and off, and maintains a kind of power supply of regulated output voltage, be divided into direct-current switch power supply and alternating-current switch power supply.In the DC-dc conversion of direct-current switch power supply, after the direct voltage of input is high-frequency ac voltage by the formal transformation that PWM converts by former limit circuit, secondary is reached by converter, through rectification circuit, alternating voltage is transformed to unidirectional DC pulse voltage again, this DC pulse voltage becomes VD after output filtering.In prior art; for the overcurrent protection mode of direct-current switch power supply; be generally and detect main circuit switching tube upper reaches, former limit overcurrent; and after being voltage signal by resistance conversion; this voltage signal is delivered to the current sense input of pwm chip, when this voltage signal exceedes a certain particular value, Switching Power Supply starts to limit power stage, and (namely voltage reduces; electric current increases), now pwm chip still has pulsewidth to export.Because Switching Power Supply former limit circuit entrance electric current is comparatively large, and transformer and main switch are all in continuous duty, generate heat more, and cause the loss of Switching Power Supply when overcurrent and short circuit to strengthen, reliability reduces.
Summary of the invention
The object of the present invention is to provide the current foldback circuit of a kind of adjustable intermittent time, overcurrent and the short-circuit protection function of pwm chip can be expanded, strengthen the reliability of Switching Power Supply product.
For achieving the above object, the technical solution used in the present invention is:
The current foldback circuit of a kind of adjustable intermittent time; comprise current detecting unit, reference voltage unit, comparing unit, Time-delayed trigger unit and main control chip unit; current detecting unit is connected the input of comparing unit with the output of reference voltage unit; the output of comparing unit connects the input of Time-delayed trigger unit, and the output of Time-delayed trigger unit connects the input of main control chip unit.
Described current detecting unit adopts bleeder circuit, bleeder circuit comprises the first resistance and the second resistance, the first end of the first resistance connects the compensating signal input of main control chip unit, second end of the first resistance connect the in-phase input end of comparing unit and the second resistance first end, the second end ground connection of the second resistance.
Described reference voltage unit comprises the 3rd resistance, the 4th resistance, the 5th resistance and voltage stabilizing didoe, the first end of the 3rd resistance connects power supply, second end of the 3rd resistance connects the negative pole of voltage stabilizing didoe and the first end of the 4th resistance, the plus earth of voltage stabilizing didoe, the second end of the 4th resistance is by the 5th grounding through resistance.
Described comparing unit comprises the 6th resistance, 7th resistance, first electric capacity, second electric capacity and operational amplifier, the first end of the 6th resistance connects the first end of reference voltage unit the 4th resistance, second end of the 6th resistance connects the first end of the 7th resistance and the inverting input of operational amplifier, second end of the 6th resistance is also by the first capacity earth, the output of the second end concatenation operation amplifier of the 7th resistance, the positive power source terminal ground connection of operational amplifier, the negative power end of operational amplifier connects voltage signal, the negative power end of operational amplifier is also by the second capacity earth.
Described Time-delayed trigger unit comprises the 8th resistance, 9th resistance, tenth resistance, 3rd electric capacity, 4th electric capacity, 5th electric capacity and 555 timers, the first end of the 8th resistance connects the output of comparing unit operational amplifier, second end of the 8th resistance connects the second pin of 555 timers, the first end of the 9th resistance is by the 3rd capacity earth, the first end of the 9th resistance also connects the 4th pin of 555 timers, second end of the 9th resistance connects the 8th pin of 555 timers and the first end of the tenth resistance, 8th pin of 555 timers also connects power supply, second end of the tenth resistance connects the 6th pin and the 7th pin of 555 timers, second end of the tenth resistance is also by the 5th capacity earth, 5th pin of 555 timers is by the 4th capacity earth.
Described main control chip unit comprises the 11 resistance, the 12 resistance, triode and pwm chip, the base stage of triode connects the 3rd pin of Time-delayed trigger unit 555 timer by the 11 resistance, the base stage of triode is also by the 12 grounding through resistance, the collector electrode of triode connects the compensating signal input of pwm chip, the grounded emitter of triode.
The present invention obtains the voltage signal of reflection primary current size from the pwm chip of Switching Power Supply; and after comparing with reference voltage signal; the interruption being controlled PWM chip by delay trigger circuit is exported; and the intermittent time can be regulated as required in overcurrent protection process; reduce the loss of Switching Power Supply during overcurrent protection, make Switching Power Supply more safe and reliable in overcurrent or short-circuit protection process.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
As shown in Figure 1; the current foldback circuit of a kind of adjustable intermittent time of the present invention; comprise current detecting unit, reference voltage unit, comparing unit, Time-delayed trigger unit and main control chip unit; current detecting unit is connected the input of comparing unit with the output of reference voltage unit; the output of comparing unit connects the input of Time-delayed trigger unit, and the output of Time-delayed trigger unit connects the input of main control chip unit.
Current detecting unit for obtain Switching Power Supply pwm chip in reflect the compensation voltage signal of mains switch primary current size, comprise the first resistance R1 and the second resistance R2, first resistance R1 and the second resistance R2 forms bleeder circuit, the first end of the first resistance R1 connects the compensating signal input of pwm chip in main control chip unit, second end of the first resistance R1 connect the in-phase input end of comparing unit and the second resistance R2 first end, the second end ground connection of the second resistance R2.When overload situations appears in Switching Power Supply, output voltage declines, and output current rises, then the voltage of pwm chip compensating signal input raises.
Reference voltage unit is used for providing a reference voltage signal, comprise the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5 and voltage stabilizing didoe, the first end of the 3rd resistance R3 connects power supply, second end of the 3rd resistance R3 connects the negative pole of voltage stabilizing didoe and the first end of the 4th resistance R4, the plus earth of voltage stabilizing didoe, second end of the 4th resistance R4 is by the 5th resistance R5 ground connection, and the first end of the 4th resistance R4 is the output of reference voltage signal.Wherein, by adjusting the resistance of the 4th resistance R4 and the 5th resistance R5, the size of output reference voltage signal can be controlled.
Comparing unit comprises the 6th resistance R6, 7th resistance R7, first electric capacity C1, second electric capacity C2 and operational amplifier, the first end of the 6th resistance R6 connects the first end of reference voltage unit the 4th resistance R4, second end of the 6th resistance R6 connects the first end of the 7th resistance R7 and the inverting input of operational amplifier, second end of the 6th resistance R6 is also by the first electric capacity C1 ground connection, the output of the second end concatenation operation amplifier of the 7th resistance R7, the positive power source terminal ground connection of operational amplifier, the negative power end of operational amplifier connects voltage signal, the negative power end of operational amplifier is also by the second capacity earth.Comparing unit decides the height of output level by the bucking voltage contrasting reference voltage signal and pwm chip compensating signal input, under normal circumstances, the reference voltage of input is higher than the bucking voltage after the first resistance R1 and the second resistance R2 dividing potential drop, and the operational amplifier of comparing unit exports high level; When overload situations appears in Switching Power Supply, the bucking voltage of pwm chip compensating signal input, will higher than reference voltage signal after the first resistance R1 and the second resistance R2 dividing potential drop, then the output of comparing unit operational amplifier is overturn by high level is low level.Wherein, by changing the resistance of bleeder circuit first resistance R1 and the second resistance R2, the restriction of Switching Power Supply being crossed to flow point can be adjusted.
Time-delayed trigger unit comprises the 8th resistance R8, 9th resistance R9, tenth resistance R10, 3rd electric capacity C3, 4th electric capacity C4, 5th electric capacity C5 and 555 timers, the first end of the 8th resistance R8 connects the output of comparing unit operational amplifier, second end of the 8th resistance R8 connects the second pin of 555 timers, the first end of the 9th resistance R9 is by the 3rd electric capacity C3 ground connection, the first end of the 9th resistance R9 also connects the 4th pin of 555 timers, second end of the 9th resistance R9 connects the 8th pin of 555 timers and the first end of the tenth resistance R10, 8th pin of 555 timers also connects power supply, second end of the tenth resistance R10 connects the 6th pin and the 7th pin of 555 timers, second end of the tenth resistance R10 is also by the 5th electric capacity C5 ground connection, 5th pin of 555 timers is by the 4th electric capacity C4 ground connection.When the output of comparing unit operational amplifier is low level by high level upset, the triggering level of 555 timer second pins is also by high step-down, then the 3rd pin of 555 timers exports a triggering signal from low to high.Wherein, by adjusting the parameter value of the tenth resistance R10 and the 5th electric capacity C5, the time of the triggering signal maintenance high level that 555 timers the 3rd pin exports can be controlled.
Main control chip unit comprises the 11 resistance R11, the 12 resistance R12, triode Q1 and pwm chip, the base stage of triode Q1 connects the 3rd pin of Time-delayed trigger unit 555 timer by the 11 resistance R11, the base stage of triode Q1 is also by the 12 resistance R12 ground connection, the collector electrode of triode Q1 connects the compensating signal input of pwm chip, the grounded emitter of triode Q1.3rd pin of 555 timers exports triggering signal from low to high; this triggering signal becomes low level from high level after the 11 resistance R11, the 12 resistance R12 and triode Q1; thus the bucking voltage of pwm chip compensating signal input is dragged down; and then control pwm chip closes its pulse output, reaches the object of protection switch power supply.The triggering signal that 555 timers the 3rd pin exports keeps the time of high level that is pwm chip to turn off the time of its pulse output; the longer intermittent time can reduce average power consumption when Switching Power Supply overcurrent or short circuit, thus reaches reliable overcurrent or short-circuit protection.
Operation principle of the present invention is: when Switching Power Supply normally works, the operational amplifier of comparing unit exports high level all the time, there will not be energizing signal, therefore the output of Time-delayed trigger unit also there will not be high trigger signal, the triode Q1 remain off of main control chip unit, whole current foldback circuit on the normal work of Switching Power Supply without impact, when there is overload or short-circuit conditions in Switching Power Supply, the bucking voltage of the pwm chip compensating signal input that current detecting unit collects after dividing potential drop higher than reference voltage, it is low level that the output of comparing unit operational amplifier is overturn by high level, the triggering level of the second pin of Time-delayed trigger unit 555 timer is also by high step-down, then Time-delayed trigger unit enters temporary stable state, 3rd pin of 555 timers exports a triggering signal from low to high, this triggering signal is through the 11 resistance R11, low level is become from high level after 12 resistance R12 and triode Q1, thus the bucking voltage of pwm chip compensating signal input is dragged down, and then control pwm chip closes its pulse output, reach the object of protection switch power supply.After the time of t=1.1R10*C5, Time-delayed trigger unit gets back to stable state, 3rd pin output low level of 555 timers, then triode Q1 ends, the bucking voltage of pwm chip compensating signal input raises again, pwm chip starts output pulse, then Switching Power Supply restarts to start.If fault is not still got rid of, Switching Power Supply again can detect over-current signal in start-up course, and the operational amplifier of comparing unit exports energizing signal from high to low again, thus control Time-delayed trigger unit reenters steady state temporarily ,then Switching Power Supply enters intermittent condition again.The present invention extends overcurrent and the short-circuit protection function of pwm chip, can be used for the switching power circuit of various topological structures, as single-end circuit, symmetric circuit etc.; easy to adjust; safe and reliable, effectively reduce the power loss in power supply overcurrent protection process, improve the reliability of Switching Power Supply.

Claims (6)

1. the current foldback circuit of an adjustable intermittent time; it is characterized in that: comprise current detecting unit, reference voltage unit, comparing unit, Time-delayed trigger unit and main control chip unit; current detecting unit is connected the input of comparing unit with the output of reference voltage unit; the output of comparing unit connects the input of Time-delayed trigger unit, and the output of Time-delayed trigger unit connects the input of main control chip unit.
2. the current foldback circuit of a kind of adjustable intermittent time as claimed in claim 1; it is characterized in that: described current detecting unit adopts bleeder circuit; bleeder circuit comprises the first resistance and the second resistance; the first end of the first resistance connects the compensating signal input of main control chip unit; second end of the first resistance connect the in-phase input end of comparing unit and the second resistance first end, the second end ground connection of the second resistance.
3. the current foldback circuit of a kind of adjustable intermittent time as claimed in claim 2; it is characterized in that: described reference voltage unit comprises the 3rd resistance, the 4th resistance, the 5th resistance and voltage stabilizing didoe; the first end of the 3rd resistance connects power supply; second end of the 3rd resistance connects the negative pole of voltage stabilizing didoe and the first end of the 4th resistance; the plus earth of voltage stabilizing didoe, the second end of the 4th resistance is by the 5th grounding through resistance.
4. the current foldback circuit of a kind of adjustable intermittent time as claimed in claim 3, it is characterized in that: described comparing unit comprises the 6th resistance, 7th resistance, first electric capacity, second electric capacity and operational amplifier, the first end of the 6th resistance connects the first end of reference voltage unit the 4th resistance, second end of the 6th resistance connects the first end of the 7th resistance and the inverting input of operational amplifier, second end of the 6th resistance is also by the first capacity earth, the output of the second end concatenation operation amplifier of the 7th resistance, the positive power source terminal ground connection of operational amplifier, the negative power end of operational amplifier connects voltage signal, the negative power end of operational amplifier is also by the second capacity earth.
5. the current foldback circuit of a kind of adjustable intermittent time as claimed in claim 4, it is characterized in that: described Time-delayed trigger unit comprises the 8th resistance, 9th resistance, tenth resistance, 3rd electric capacity, 4th electric capacity, 5th electric capacity and 555 timers, the first end of the 8th resistance connects the output of comparing unit operational amplifier, second end of the 8th resistance connects the second pin of 555 timers, the first end of the 9th resistance is by the 3rd capacity earth, the first end of the 9th resistance also connects the 4th pin of 555 timers, second end of the 9th resistance connects the 8th pin of 555 timers and the first end of the tenth resistance, 8th pin of 555 timers also connects power supply, second end of the tenth resistance connects the 6th pin and the 7th pin of 555 timers, second end of the tenth resistance is also by the 5th capacity earth, 5th pin of 555 timers is by the 4th capacity earth.
6. the current foldback circuit of a kind of adjustable intermittent time as claimed in claim 5; it is characterized in that: described main control chip unit comprises the 11 resistance, the 12 resistance, triode and pwm chip; the base stage of triode connects the 3rd pin of Time-delayed trigger unit 555 timer by the 11 resistance; the base stage of triode is also by the 12 grounding through resistance; the collector electrode of triode connects the compensating signal input of pwm chip, the grounded emitter of triode.
CN201510543502.3A 2015-08-31 2015-08-31 Overcurrent protection circuit with adjustable intermittent time Pending CN105262055A (en)

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Cited By (7)

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Publication number Priority date Publication date Assignee Title
CN106786814A (en) * 2017-01-16 2017-05-31 威海新北洋正棋机器人股份有限公司 A kind of leadage circuit
WO2018024221A1 (en) * 2016-08-02 2018-02-08 欧普照明股份有限公司 Timer-based protection circuit and lamp
CN108173236A (en) * 2017-12-26 2018-06-15 中煤科工集团重庆研究院有限公司 Jamproof mine safety grid
CN108181501A (en) * 2018-01-22 2018-06-19 林海 A kind of current signal Acquisition Circuit with protective effect
CN108957085A (en) * 2018-07-26 2018-12-07 大力电工襄阳股份有限公司 High-voltage detecting device
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
CN112366659A (en) * 2020-12-16 2021-02-12 广州飞达音响股份有限公司 Novel high-power switching power supply protection circuit for audio power amplifier

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018024221A1 (en) * 2016-08-02 2018-02-08 欧普照明股份有限公司 Timer-based protection circuit and lamp
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CN106786814A (en) * 2017-01-16 2017-05-31 威海新北洋正棋机器人股份有限公司 A kind of leadage circuit
CN106786814B (en) * 2017-01-16 2019-07-12 威海新北洋正棋机器人股份有限公司 A kind of leadage circuit
CN108173236A (en) * 2017-12-26 2018-06-15 中煤科工集团重庆研究院有限公司 Jamproof mine safety grid
CN108181501A (en) * 2018-01-22 2018-06-19 林海 A kind of current signal Acquisition Circuit with protective effect
CN108957085A (en) * 2018-07-26 2018-12-07 大力电工襄阳股份有限公司 High-voltage detecting device
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
CN112366659A (en) * 2020-12-16 2021-02-12 广州飞达音响股份有限公司 Novel high-power switching power supply protection circuit for audio power amplifier

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