CN103762545B - A kind of multi-stage controllable current protection circuit - Google Patents
A kind of multi-stage controllable current protection circuit Download PDFInfo
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- CN103762545B CN103762545B CN201410052066.5A CN201410052066A CN103762545B CN 103762545 B CN103762545 B CN 103762545B CN 201410052066 A CN201410052066 A CN 201410052066A CN 103762545 B CN103762545 B CN 103762545B
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- resistance
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Abstract
The invention provides a kind of multi-stage controllable current protection circuit, comprising: the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the 11 resistance, the 12 resistance, the first operational amplifier, the second operational amplifier, the 3rd operational amplifier, four-operational amplifier, the first capacitor, the second capacitor, diode, the first voltage-stabiliser tube, the second voltage-stabiliser tube and power supply.According to multi-stage controllable current protection circuit of the present invention, solve the too high problem brought of input voltage, effectively prevent because electric current is excessive and make protection out of control.
Description
Technical field
The present invention relates to electricity field, more specifically, relate to a kind of multi-stage controllable current protection circuit.
Background technology
Can cut-off protection circuit be that one prevents major loop short circuit or DC traction motor generation ring fire from causing main circuit current excessive and damaging the electric equipment such as synchronous traction generator, main rectifier cabinet, the circuit that overcurrent and overvoltage all protect is carried out to main circuit.
General protective circuit is circuit overcurrent protection, this circuit is protection power source device when power overload situation or output short-circuit, the shortcoming of this circuit is: be subject to the impact that operational amplifier can bear voltage, when occurring load short circuits, during the fortuitous events such as overload or control circuit inefficacy, the electric current flowing through pressurizer breaker in middle triode can be caused excessive, triode power consumption is increased, heating, if there is no overcurrent protective device, high power switch triode just likely damages, so strict to the area requirement of input voltage, its scope is 0 ~ Vcc, if exceed voltage range, protective circuit will lose protected effect.
Summary of the invention
The invention provides a kind of multi-stage controllable current protection circuit, it comprises:
First resistance, second resistance, 3rd resistance, 4th resistance, 5th resistance, 6th resistance, 7th resistance, 8th resistance, 9th resistance, tenth resistance, 11 resistance, 12 resistance, first operational amplifier, second operational amplifier, 3rd operational amplifier, four-operational amplifier, first capacitor, second capacitor, diode, first voltage-stabiliser tube, second voltage-stabiliser tube and power supply, wherein power supply connects the positive power source terminal of four-operational amplifier, and the normal phase input end of this four-operational amplifier connects the first end of the first resistance respectively, the first end of the second resistance and the negative electrode of diode, the inverting input of this four-operational amplifier connects the first end of the first capacitor, the output of this four-operational amplifier connects the second end of this first capacitor, second end of this second resistance connects the first end of the 3rd resistance and the first end of the second capacitor respectively, and the second end of this second capacitor connects the anode of diode respectively, second end of the 3rd resistance and the negative power end of this four-operational amplifier, the second end of the 3rd resistance also connects the first end of the first capacitor, the first end of the 4th resistance, the first end of the 5th resistance and the normal phase input end of the second operational amplifier, the second end of this first resistance also connects the first end of the first capacitor respectively, the first end of the 4th resistance, the first end of the 5th resistance and the normal phase input end of the second operational amplifier, second end ground connection of the 4th resistance, second end of the 5th resistance connects the first end of the 6th resistance and the output of the 3rd operational amplifier respectively, second end of the 6th resistance connects the first end of the 7th resistance and the inverting input of the 3rd operational amplifier respectively, second end ground connection of the 7th resistance, the normal phase input end of the 3rd operational amplifier connects the first end of the 8th resistance and the first end of the 9th resistance respectively, second end of the 8th resistance connects output and the inverting input of the second operational amplifier respectively, second end of the 9th resistance connects the first end of the tenth resistance and the anode of the first voltage-stabiliser tube respectively, the negative electrode of this first voltage-stabiliser tube connects the negative electrode of the second voltage-stabiliser tube, the plus earth of this second voltage-stabiliser tube, second end of the tenth resistance connects the output of the first operational amplifier, the positive input end grounding of this first operational amplifier, the inverting input of this first operational amplifier connects the first end of the 11 resistance and the first end of the 12 resistance respectively, second termination of the 11 resistance receives reference voltage, second termination of the 12 resistance receives input voltage.
Wherein the resistance of the 6th resistance, the 7th resistance, the 8th resistance and the 9th resistance is equal.
Power supply is 5V, the resistance of the first resistance is 1 kilohm, the resistance of the second resistance is 500 ohm, the resistance of the 3rd resistance is 500 ohm, the resistance of the 4th resistance is 1 kilohm, the resistance of the 5th resistance is 100 ohm, the resistance of the 6th resistance is 100 ohm, the resistance of the 7th resistance is 100 ohm, the resistance of the 8th resistance is 100 ohm, the resistance of the 9th resistance is 100 ohm, the resistance of the tenth resistance is 510 ohm, the resistance of the 11 resistance is 1 kilohm, the resistance of the 12 resistance is 500 ohm, the capacitance of the first capacitor is 0.1uF, the capacitance of the second capacitor is 0.1uF.
Multi-stage controllable current protection circuit according to the present invention solves the defect of original circuit; solve the problem that overtension brings; adding can breaking circuit; make the core protection circuit part input current Io of whole circuit controlled; and there is high-low limit current range; make protective circuit more reliable; when voltage conditions does not mate due to can not output current Io and make protective circuit be in off state; reach the object that core protection circuit part is protected itself, effectively prevent because electric current is excessive and make protection out of control.
Accompanying drawing explanation
Fig. 1 is the principle schematic of multi-stage controllable current protection circuit of the present invention.
Embodiment
Fig. 1 is the principle schematic of multi-stage controllable current protection circuit of the present invention.As shown in the figure, multi-stage controllable current protection circuit of the present invention comprises:
First resistance R1, second resistance R2, 3rd resistance R3, 4th resistance R4, 5th resistance R5, 6th resistance R6, 7th resistance R7, 8th resistance R8, 9th resistance R9, tenth resistance R10, 11 resistance R11, 12 resistance R12, first operational amplifier A 1, second operational amplifier A 2, 3rd operational amplifier A 3, four-operational amplifier A4, first capacitor C1, second capacitor C2, diode D, first voltage-stabiliser tube Z1, second voltage-stabiliser tube Z2 and power Vcc, wherein power Vcc connects the positive power source terminal of four-operational amplifier A4, the normal phase input end of this four-operational amplifier A4 connects the first end of the first resistance R1 respectively, the first end of the second resistance R2 and the negative electrode of diode, the inverting input of this four-operational amplifier A4 connects the first end of the first capacitor C1, the output of this four-operational amplifier A4 connects second end of this first capacitor C1, second end of this second resistance R2 connects the first end of the 3rd resistance R3 and the first end of the second capacitor C2 respectively, second end of this second capacitor C2 connects the anode of diode D respectively, second end of the 3rd resistance R3 and the negative power end of this four-operational amplifier A4, second end of the 3rd resistance R3 also connects the first end of the first capacitor C1, the first end of the 4th resistance R4, the first end of the 5th resistance R5 and the normal phase input end of the second operational amplifier A 2, second end of this first resistance R1 also connects the first end of the first capacitor C1 respectively, the first end of the 4th resistance R4, the first end of the 5th resistance R5 and the normal phase input end of the second operational amplifier A 2, the second end ground connection of the 4th resistance R4, second end of the 5th resistance R5 connects the first end of the 6th resistance R6 and the output of the 3rd operational amplifier A 3 respectively, second end of the 6th resistance R6 connects the first end of the 7th resistance R7 and the inverting input of the 3rd operational amplifier A 3 respectively, the second end ground connection of the 7th resistance R7, the normal phase input end of the 3rd operational amplifier A 3 connects the first end of the 8th resistance R8 and the first end of the 9th resistance R9 respectively, second end of the 8th resistance R8 connects output and the inverting input of the second operational amplifier A 2 respectively, second end of the 9th resistance R9 connects the first end of the tenth resistance R10 and the anode of the first voltage-stabiliser tube Z1 respectively, the negative electrode of this first voltage-stabiliser tube Z1 connects the negative electrode of the second voltage-stabiliser tube Z2, the plus earth of this second voltage-stabiliser tube Z2, second end of the tenth resistance R10 connects the output of the first operational amplifier A 1, the positive input end grounding of this first operational amplifier A 1, the inverting input of this first operational amplifier A 1 connects the first end of the 11 resistance R11 and the first end of the 12 resistance R12 respectively, second termination of the 11 resistance R11 receives la tension de reference Uref est, second termination of the 12 resistance R12 receives input voltage U1.
In above-mentioned multi-stage controllable current protection circuit, the resistance that can be designed to the 6th resistance R6, the 7th resistance R7, the 8th resistance R8 and the 9th resistance R9 is equal.
First voltage-stabiliser tube Z1 and the second voltage-stabiliser tube Z2 plays voltage-limiting protection effect.
4th resistance R4 is earth resistance, plays ground protection effect.
First capacitor C1 and the second capacitor C2 is filter capacitor, and diode D rises and prevents voltage between four-operational amplifier A4 and UR2, UR3 excessive, causes this four-operational amplifier A4 to damage.
Briefly introduce the operation principle of multi-stage controllable current protection circuit of the present invention below.
Input voltage U1 inputs to the 12 resistance R12, and la tension de reference Uref est inputs to the 11 resistance R11, then the magnitude of voltage U of the inverting input of the first operational amplifier A 1 is:
U＝[R11/(R11+R12)]U1+[R12/(R11+R12)]Uref,
Make U=0 can obtain threshold voltage Ut=(R12/R11) Uref of this first operational amplifier A 1, can know that the change size of la tension de reference Uref est and the value of the 11 resistance R11 and the 12 resistance R12 just can change the threshold voltage of the first operational amplifier A 1 output by this formula, the scope of input voltage can be set by setting threshold values, when input voltage exceedes the scope of setting, first operational amplifier A 1 turns off, and namely it does not have output voltage.When input voltage is in the scope set, the two ends of the 9th resistance R9 have voltage to occur.Be designed in advance: the resistance of the 6th resistance R6, the 7th resistance R7, the 8th resistance R8 and the 9th resistance R9 is equal, i.e. R6=R7=R8=R9, it can thus be appreciated that the relation between the voltage of node p1 and p2:
Up1＝(R8/(R9+R8))Ut+(R9/(R9+R8))Up2(1)
＝0.5Ut+0.5Up2，
Uo2＝Up2，(2)
Uo1＝(1+R6/R7)Up1＝2Up1，(3)
The voltage U on the 5th resistance R5 can be drawn by above three formulas
r5=Uo1-Up2=Ut, so i
r5=Ut/R5=i, Io=i*R
1/ (R
1+ R
2+ R
3), at this moment just the voltage U 1 of input is converted into current i, the electric current converted is as reference current, and now on resistance R2, voltage is U
r2=I
or2, the voltage of load current on the 3rd resistance R3 is U
r3=I
or3.When input signal is AC signal, and when being controlled by the output of four-operational amplifier A4, now by voltage U
r2and voltage U
r3compare, if U
r3<U
r2, the signal that four-operational amplifier A4 exports can make the pulse duration of input signal broaden, and then makes the output voltage of four-operational amplifier A4 increase, thus control electric current I o makes it increase; If U
r3>U
r2, the signal that four-operational amplifier A4 exports can make the pulse duration of input signal narrow, and then makes the output voltage of four-operational amplifier A4 decline, thus control electric current I o makes it reduce.
The value of respective components and parts of the present invention can be determined according to concrete should being used for, here the value of one group of components and parts used in practice is illustrated, power Vcc is 5V, the resistance of the first resistance R1 is 1 kilohm, the resistance of the second resistance R2 is 500 ohm, the resistance of the 3rd resistance R3 is 500 ohm, the resistance of the 4th resistance R4 is 1 kilohm, the resistance of the 5th resistance R5 is 100 ohm, the resistance of the 6th resistance R6 is 100 ohm, the resistance of the 7th resistance R7 is 100 ohm, the resistance of the 8th resistance R8 is 100 ohm, the resistance of the 9th resistance R9 is 100 ohm, the resistance of the tenth resistance R10 is 510 ohm, the resistance of the 11 resistance R11 is 1 kilohm, the resistance of the 12 resistance R12 is 500 ohm, the capacitance of the first capacitor C1 is 0.1uF, the capacitance of the second capacitor C2 is 0.1uF.
Multi-stage controllable current protection circuit of the present invention solves the defect of original circuit; solve the problem that overtension brings; adding can breaking circuit; make the core protection circuit part input current Io of whole circuit controlled; and there is high-low limit current range; make protective circuit more reliable; when voltage conditions does not mate due to can not output current Io and make protective circuit be in off state; reach the object that core protection circuit part is protected itself, effectively prevent because electric current is excessive and make protection out of control.
Claims (3)
1. a multi-stage controllable current protection circuit, it comprises:
First resistance, second resistance, 3rd resistance, 4th resistance, 5th resistance, 6th resistance, 7th resistance, 8th resistance, 9th resistance, tenth resistance, 11 resistance, 12 resistance, first operational amplifier, second operational amplifier, 3rd operational amplifier, four-operational amplifier, first capacitor, second capacitor, diode, first voltage-stabiliser tube, second voltage-stabiliser tube and power supply, wherein power supply connects the positive power source terminal of four-operational amplifier, and the normal phase input end of this four-operational amplifier connects the first end of the first resistance respectively, the first end of the second resistance and the negative electrode of diode, the inverting input of this four-operational amplifier connects the first end of the first capacitor, the output of this four-operational amplifier connects the second end of this first capacitor, second end of this second resistance connects the first end of the 3rd resistance and the first end of the second capacitor respectively, and the second end of this second capacitor connects the anode of diode respectively, second end of the 3rd resistance and the negative power end of this four-operational amplifier, the second end of the 3rd resistance also connects the first end of the first capacitor, the first end of the 4th resistance, the first end of the 5th resistance and the normal phase input end of the second operational amplifier, the second end of this first resistance also connects the first end of the first capacitor respectively, the first end of the 4th resistance, the first end of the 5th resistance and the normal phase input end of the second operational amplifier, second end ground connection of the 4th resistance, second end of the 5th resistance connects the first end of the 6th resistance and the output of the 3rd operational amplifier respectively, second end of the 6th resistance connects the first end of the 7th resistance and the inverting input of the 3rd operational amplifier respectively, second end ground connection of the 7th resistance, the normal phase input end of the 3rd operational amplifier connects the first end of the 8th resistance and the first end of the 9th resistance respectively, second end of the 8th resistance connects output and the inverting input of the second operational amplifier respectively, second end of the 9th resistance connects the first end of the tenth resistance and the anode of the first voltage-stabiliser tube respectively, the negative electrode of this first voltage-stabiliser tube connects the negative electrode of the second voltage-stabiliser tube, the plus earth of this second voltage-stabiliser tube, second end of the tenth resistance connects the output of the first operational amplifier, the positive input end grounding of this first operational amplifier, the inverting input of this first operational amplifier connects the first end of the 11 resistance and the first end of the 12 resistance respectively, second termination of the 11 resistance receives reference voltage, second termination of the 12 resistance receives input voltage.
2. multi-stage controllable current protection circuit according to claim 1, wherein the resistance of the 6th resistance, the 7th resistance, the 8th resistance and the 9th resistance is equal.
3. multi-stage controllable current protection circuit according to claim 1, wherein power supply is 5V, the resistance of the first resistance is 1 kilohm, the resistance of the second resistance is 500 ohm, the resistance of the 3rd resistance is 500 ohm, the resistance of the 4th resistance is 1 kilohm, the resistance of the 5th resistance is 100 ohm, the resistance of the 6th resistance is 100 ohm, the resistance of the 7th resistance is 100 ohm, the resistance of the 8th resistance is 100 ohm, the resistance of the 9th resistance is 100 ohm, the resistance of the tenth resistance is 510 ohm, the resistance of the 11 resistance is 1 kilohm, the resistance of the 12 resistance is 500 ohm, the capacitance of the first capacitor is 0.1uF, the capacitance of the second capacitor is 0.1uF.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410052066.5A CN103762545B (en) | 2014-02-14 | 2014-02-14 | A kind of multi-stage controllable current protection circuit |
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|---|---|---|---|
| CN201410052066.5A CN103762545B (en) | 2014-02-14 | 2014-02-14 | A kind of multi-stage controllable current protection circuit |
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| CN103762545B true CN103762545B (en) | 2016-04-27 |
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| CN106793230B (en) * | 2017-01-25 | 2023-02-07 | 苏州振湖电炉有限公司 | Overcurrent protection circuit of induction furnace induction coil |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2033557U (en) * | 1988-06-04 | 1989-03-01 | 北京海淀区玉渊潭华玉电子技术公司 | Current-limiting, overcurrent, overvoltage protector of regulated power supply |
| CN1949622A (en) * | 2006-09-29 | 2007-04-18 | 天津市正方工业有限公司 | Voltage identification short circuit protection constant current voltage stabilizing circuit |
| CN101119027A (en) * | 2006-07-24 | 2008-02-06 | 天津市松正半导体技术有限公司 | Overcurrent protection circuit |
| CN103280771A (en) * | 2013-06-13 | 2013-09-04 | 成都联腾动力控制技术有限公司 | Motor controller overcurrent judgment and protection circuit |
| CN203180783U (en) * | 2013-04-12 | 2013-09-04 | 深圳市海洋王照明工程有限公司 | Boosted circuit |
-
2014
- 2014-02-14 CN CN201410052066.5A patent/CN103762545B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2033557U (en) * | 1988-06-04 | 1989-03-01 | 北京海淀区玉渊潭华玉电子技术公司 | Current-limiting, overcurrent, overvoltage protector of regulated power supply |
| CN101119027A (en) * | 2006-07-24 | 2008-02-06 | 天津市松正半导体技术有限公司 | Overcurrent protection circuit |
| CN1949622A (en) * | 2006-09-29 | 2007-04-18 | 天津市正方工业有限公司 | Voltage identification short circuit protection constant current voltage stabilizing circuit |
| CN203180783U (en) * | 2013-04-12 | 2013-09-04 | 深圳市海洋王照明工程有限公司 | Boosted circuit |
| CN103280771A (en) * | 2013-06-13 | 2013-09-04 | 成都联腾动力控制技术有限公司 | Motor controller overcurrent judgment and protection circuit |
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| CN103762545A (en) | 2014-04-30 |
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