CN104393760B - The positive negative output low voltage difference with short-circuit protection function adjusts circuit - Google Patents
The positive negative output low voltage difference with short-circuit protection function adjusts circuit Download PDFInfo
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- CN104393760B CN104393760B CN201410694973.XA CN201410694973A CN104393760B CN 104393760 B CN104393760 B CN 104393760B CN 201410694973 A CN201410694973 A CN 201410694973A CN 104393760 B CN104393760 B CN 104393760B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
-
- 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
- H02H7/1213—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 for DC-DC converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a kind of positive negative output low voltage difference with short-circuit protection function and adjust circuit, adjust circuit including positive voltage output low voltage difference and negative voltage output low voltage difference adjusts circuit, this two parts circuit structure is identical, voltage Symmetrical；Each partial circuit all utilize operational amplifier and audion constitute negative feedback amplifier circuit, operational amplifier output terminal is connected with transistor base, duty by the output voltage control audion of operational amplifier, transistor collector is connected to electrical equipment as output voltage, is connected with opamp input terminal by feedback resistance simultaneously.The circuit of the present invention, is once short-circuited, it is necessary to re-powers and just can continue to put out voltage；Output voltage can adjust rapidly in little scope；Output voltage precision is high；Effectively protect electrical equipment.
Description
Technical field
The invention belongs to circuit field, be that a kind of positive negative output voltage with short-circuit protection function adjusts circuit, can be applicable to, in the multiple circuit needing short-circuit protection, especially in the electrical equipment short time, duplicate the circuit of short circuit phenomenon.
Background technology
Current similar power circuit remains to output voltage after short circuit releases, and electrical equipment may cause because repeating to be short-circuited damaging.The short-circuit protection of the present invention stops voltage output after electrical equipment short circuit, and short circuit still stops voltage output after releasing, it is necessary to after re-powering could output voltage again, efficiently solve the damage phenomenon that electrical equipment causes because repeating short circuit.
Summary of the invention
It is an object of the invention to provide a kind of positive negative output low voltage difference with short-circuit protection function and adjust circuit, while providing positive negative output low drop voltage to electrical equipment, solve the damage problem caused because electrical equipment repeats short circuit.
Technical scheme:
A kind of positive negative output low voltage difference with short-circuit protection function adjusts circuit, it is characterized in that, adjusts circuit including positive voltage output low voltage difference and negative voltage output low voltage difference adjusts circuit, and this two parts circuit structure is identical, voltage Symmetrical；Each partial circuit all utilize operational amplifier and audion constitute negative feedback amplifier circuit, operational amplifier output terminal is connected with transistor base, duty by the output voltage control audion of operational amplifier, transistor collector is connected to electrical equipment as output voltage, is connected with opamp input terminal by feedback resistance simultaneously.
Described positive voltage output low voltage difference adjusts circuit and includes the first operational amplifier, the first audion；
Power supply positive input VIN+ passes through the first resistance current limliting and the first Zener diode voltage stabilizing, the voltage stabilizing value of the first Zener diode accesses the negative input end of the first operational amplifier, the voltage stabilizing value of the first Zener diode inputs the positive input terminal to the first operational amplifier after dividing potential drop, and the first operational amplifier output terminal is connected to the base stage of the first audion；The colelctor electrode of the first audion is connected to output voltage VO UT+；Output voltage VO UT+ is through the positive input terminal of the 5th resistance feedback to the first operational amplifier.
Described negative voltage output low voltage difference adjusts circuit and includes the second operational amplifier, the 3rd audion；
Power supply negative input VIN-passes through the 8th resistance current limliting and the second Zener diode voltage stabilizing, the voltage stabilizing value of the second Zener diode accesses the negative input end of the second operational amplifier, the voltage stabilizing value of the second Zener diode inputs the positive input terminal to the second operational amplifier after dividing potential drop, and the second operational amplifier output terminal is connected to the base stage of the 3rd audion；The colelctor electrode of the 3rd audion is connected to output voltage VO UT-；Output voltage VO UT-is through the positive input terminal of the 12nd resistance feedback to the second operational amplifier.
Described positive voltage output low voltage difference adjusts output voltage VO UT+ of circuit, described negative voltage output low voltage difference adjusts output voltage VO UT-of circuit all by a capacity earth.
Described positive voltage output low voltage difference adjusts in circuit and also comprises the second audion, and the base stage of the second audion is connected with the first operational amplifier positive input terminal, and the colelctor electrode of the second audion and the colelctor electrode of the first audion connect.
Described negative voltage output low voltage difference adjusts in circuit and also comprises the 4th audion, and the base stage of the 4th audion is connected with the second operational amplifier positive input terminal, and the colelctor electrode of the 4th audion and the colelctor electrode of the 3rd audion connect.
The voltage stabilizing value of the first Zener diode accesses the negative input end of the first operational amplifier through the 3rd resistance, and the voltage stabilizing value of the first Zener diode inputs the positive input terminal to the first operational amplifier after the second resistance, the 4th electric resistance partial pressure；Second resistance, the 3rd resistance, the resistance of the 4th resistance make the negative input end voltage positive input terminal voltage less than the first operational amplifier of the first operational amplifier.
The voltage stabilizing value of the second Zener diode accesses the negative input end of the first operational amplifier through the 9th resistance, and the voltage stabilizing value of the second Zener diode inputs the positive input terminal to the first operational amplifier after the tenth resistance, the 11st electric resistance partial pressure；9th resistance, the tenth resistance, the resistance of the 11st resistance make the negative input end voltage positive input terminal voltage less than the first operational amplifier of the first operational amplifier.
The present invention has some novelty following:
1, once it is short-circuited, it is necessary to re-power and just can continue to put out voltage；
2, output voltage can adjust rapidly in little scope.
Compared with prior art, it has the beneficial effect that the present invention
1, output voltage precision is high；
2, electrical equipment is effectively protected.
Accompanying drawing explanation
Fig. 1 is that the positive negative output low voltage difference with short-circuit protection function adjusts circuit theory diagrams.
Detailed description of the invention
Below in conjunction with the accompanying drawings optimal enforcement of the present invention is described in further detail:
As shown in Figure 1: be that the positive negative output low voltage difference with short-circuit protection function adjusts circuit theory diagrams shown in figure.This circuit is specifically divided into two parts: the positive voltage output low voltage difference with short-circuit protection function adjusts circuit and has the negative voltage output low voltage difference adjustment circuit of short-circuit protection function.Two parts circuit structure is identical, voltage Symmetrical.The present invention mainly utilizes operational amplifier to constitute a negative feedback amplifier circuit with audion: operational amplifier output terminal is connected with transistor base, by the duty of the output voltage control audion of operational amplifier, transistor output is connected with opamp input terminal by feedback resistance.When electrical equipment is short-circuited, output voltage is pulled low, and now outfan cuts off voltage output by feedback, plays the effect of short-circuit protection；When short circuit releases, audion is still in cut-off state, it is necessary to re-powers and could recover voltage output.
As a example by the positive voltage output low voltage difference with short-circuit protection function adjusts circuit: when circuit powers on, power supply positive input VIN+ passes through resistance R1 current limliting and Zener diode Q1 voltage stabilizing, the voltage VD1 voltage stabilizing value equal to Zener diode Q1, the negative input end voltage of operational amplifier U1B is equal to voltage VD1, the positive input terminal voltage of operational amplifier U1B is equal to voltage VD1 through resistance R2, in the dividing potential drop of resistance R4 after R4 dividing potential drop, so operational amplifier U1B exports negative voltage, audion Q3 turns on, colelctor electrode output voltage VO UT+ of audion Q3 feeds back to the positive input terminal of operational amplifier U1B through resistance R5, the value of output voltage VO UT+ can be calculated by formula VOUT+=VD1* (1+R5/R4).
When electrical equipment uses, output voltage VO UT+ can change in little scope, when VOUT+ becomes big, the positive input terminal voltage of operational amplifier U1B becomes big, and operational amplifier U1B exports positive voltage, when the output voltage of U1B arrives certain value greatly, operational amplifier U1B exports high level, audion Q3 turns off, and electric capacity C3 discharges, and output voltage VO UT+ diminishes；When VOUT+ diminishes, the positive input terminal voltage of operational amplifier U1 diminishes, and operational amplifier U1B exports negative voltage, and audion Q3 turns on, and output voltage VO UT+ becomes big.Because the open-loop gain of operational amplifier is very big, so output voltage VO UT+ mono-occurs faint change, at once realized the low voltage difference adjustment function of output voltage by audion Q3.
When electrical equipment short circuit, output voltage VO UT+ is pulled low, now audion Q2 conducting; the negative input end voltage of operational amplifier U1B is pulled low, and operational amplifier U1B exports positive voltage, immediately closes off audion Q3; output voltage VO UT+ is reduced to 0V, plays the effect of short-circuit protection；When short circuit releases, audion Q2 still turns on, now the positive input terminal voltage of operational amplifier U1B is equal to voltage VD1 pressure drop on resistance R4, the negative input end voltage of operational amplifier U1B is equal to voltage VD1 pressure drop on electrical equipment input resistance, the reasonable value selecting resistance R2, R3, R4 makes the positive input terminal voltage of the negative input end voltage less-than operation amplifier U1B of operational amplifier U1B, audion Q3 turns off, and output voltage VO UT+ is still without output；Only re-powering, output voltage VO UT+ could export required voltage again.
The negative voltage output low voltage difference with short-circuit protection function adjusts circuit theory analysis ibid, does not repeats.
The above is only the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, on the premise of without departing from the technology of the present invention principle; can also make some improvement and deformation, these improve and deformation also should be regarded as protection scope of the present invention.
Claims (4)
1. the positive negative output low voltage difference with short-circuit protection function adjusts a circuit, it is characterized in that, adjusts circuit including positive voltage output low voltage difference and negative voltage output low voltage difference adjusts circuit, and this two parts circuit structure is identical, voltage Symmetrical；Each partial circuit all utilize operational amplifier and audion constitute negative feedback amplifier circuit, operational amplifier output terminal is connected with transistor base, duty by the output voltage control audion of operational amplifier, transistor collector is connected to electrical equipment as output voltage, is connected with opamp input terminal by feedback resistance simultaneously；
Described positive voltage output low voltage difference adjusts circuit and includes the first operational amplifier, the first audion；
Power supply positive input VIN+ passes through the first resistance current limliting and the first Zener diode voltage stabilizing, the voltage stabilizing value of the first Zener diode accesses the negative input end of the first operational amplifier, the voltage stabilizing value of the first Zener diode inputs the positive input terminal to the first operational amplifier after dividing potential drop, and the first operational amplifier output terminal is connected to the base stage of the first audion；The colelctor electrode of the first audion is connected to output voltage VO UT+；Output voltage VO UT+ is through the positive input terminal of the 5th resistance feedback to the first operational amplifier；
Described negative voltage output low voltage difference adjusts circuit and includes the second operational amplifier, the 3rd audion；
Power supply negative input VIN-passes through the 8th resistance current limliting and the second Zener diode voltage stabilizing, the voltage stabilizing value of the second Zener diode accesses the negative input end of the second operational amplifier, the voltage stabilizing value of the second Zener diode inputs the positive input terminal to the second operational amplifier after dividing potential drop, and the second operational amplifier output terminal is connected to the base stage of the 3rd audion；The colelctor electrode of the 3rd audion is connected to output voltage VO UT-；Output voltage VO UT-is through the positive input terminal of the 12nd resistance feedback to the second operational amplifier；
Described positive voltage output low voltage difference adjusts in circuit and also comprises the second audion, and the base stage of the second audion is connected with the first operational amplifier negative input end, and the colelctor electrode of the second audion and the colelctor electrode of the first audion connect；
Described negative voltage output low voltage difference adjusts in circuit and also comprises the 4th audion, and the colelctor electrode of the 4th audion and the second operational amplifier negative input end connect, and the base stage of the 4th audion is connected with the colelctor electrode of the 3rd audion.
The positive negative output low voltage difference with short-circuit protection function the most according to claim 1 adjusts circuit; it is characterized in that, described positive voltage output low voltage difference adjusts output voltage VO UT+ of circuit, described negative voltage output low voltage difference adjusts output voltage VO UT-of circuit all by a capacity earth.
The positive negative output low voltage difference with short-circuit protection function the most according to claim 1 adjusts circuit; it is characterized in that; the voltage stabilizing value of the first Zener diode accesses the negative input end of the first operational amplifier through the 3rd resistance, and the voltage stabilizing value of the first Zener diode inputs the positive input terminal to the first operational amplifier after the second resistance, the 4th electric resistance partial pressure；Second resistance, the 3rd resistance, the resistance of the 4th resistance make the negative input end voltage positive input terminal voltage less than the first operational amplifier of the first operational amplifier.
The positive negative output low voltage difference with short-circuit protection function the most according to claim 1 adjusts circuit; it is characterized in that; the voltage stabilizing value of the second Zener diode accesses the negative input end of the second operational amplifier through the 9th resistance, and the voltage stabilizing value of the second Zener diode inputs the positive input terminal to the second operational amplifier after the tenth resistance, the 11st electric resistance partial pressure；9th resistance, the tenth resistance, the resistance of the 11st resistance make the negative input end voltage positive input terminal voltage less than the second operational amplifier of the second operational amplifier.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410694973.XA CN104393760B (en) | 2014-11-27 | 2014-11-27 | The positive negative output low voltage difference with short-circuit protection function adjusts circuit |
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| CN201410694973.XA CN104393760B (en) | 2014-11-27 | 2014-11-27 | The positive negative output low voltage difference with short-circuit protection function adjusts circuit |
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| CN104393760B true CN104393760B (en) | 2016-11-09 |
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| CN104793680B (en) * | 2015-04-08 | 2017-12-12 | 云南卓烁科技有限公司 | A kind of voltage signal demodulator circuit |
| CN109274261A (en) * | 2018-11-30 | 2019-01-25 | 中国电子科技集团公司第四十三研究所 | A kind of non-isolated negative pressure output control circuit and control method |
| CN110138039A (en) * | 2019-05-24 | 2019-08-16 | 胡玉枝 | A kind of solar charging circuit and charger |
| CN111082764A (en) * | 2019-12-19 | 2020-04-28 | 武汉航空仪表有限责任公司 | Single-ended input-to-differential output circuit |
| CN112737303A (en) * | 2020-12-31 | 2021-04-30 | 深圳开立生物医疗科技股份有限公司 | Power supply circuit and ultrasonic equipment |
| CN113687681A (en) * | 2021-08-20 | 2021-11-23 | 京东方科技集团股份有限公司 | Power module, operational amplifier driving and dimming glass |
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| FR2830091B1 (en) * | 2001-09-25 | 2004-09-10 | St Microelectronics Sa | VOLTAGE REGULATOR INCORPORATING A STABILIZATION RESISTOR AND A CIRCUIT FOR LIMITING THE OUTPUT CURRENT |
| CN101847928A (en) * | 2010-04-14 | 2010-09-29 | 广州市广晟微电子有限公司 | Quick starting circuit and method of low-noise linear regulator |
| TWI441007B (en) * | 2011-07-05 | 2014-06-11 | Holtek Semiconductor Inc | Capacitor-free low drop-out voltage regulator and voltage regulating method thereof |
| CN203788173U (en) * | 2014-04-09 | 2014-08-20 | 湖南科技学院 | Simple and high-efficiency DC voltage-stabilizing power supply used for laboratory |
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Effective date of registration: 20180813 Address after: 233030 2016 Tang He road, Bengbu, Anhui Patentee after: Huadong Photoelectric Integrated Device Research Institute Address before: 215163 No. 89 Longshan Road, hi tech Zone, Suzhou, Jiangsu Patentee before: China North Industries Group Corporation No.214 Research Institute Suzhou R&D Center |
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