CN105610313A - 电压稳定的环路电路 - Google Patents

电压稳定的环路电路 Download PDF

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CN105610313A
CN105610313A CN201610009707.8A CN201610009707A CN105610313A CN 105610313 A CN105610313 A CN 105610313A CN 201610009707 A CN201610009707 A CN 201610009707A CN 105610313 A CN105610313 A CN 105610313A
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resistance
diode
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张远香
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Chengdu Hongshan Technology Co Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/32Means for protecting converters other than automatic disconnection
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/02Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10Conversion 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
    • H02M3/145Conversion 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
    • H02M3/155Conversion 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
    • H02M3/156Conversion 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
    • H02M3/1563Conversion 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 without using an external clock
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/32Means for protecting converters other than automatic disconnection
    • H02M1/325Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/02Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10Conversion 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
    • H02M3/145Conversion 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
    • H02M3/155Conversion 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
    • H02M3/156Conversion 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
    • H02M3/1566Conversion 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 with means for compensating against rapid load changes, e.g. with auxiliary current source, with dual mode control or with inductance variation

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

本发明公开了电压稳定的环路电路,包括光电耦合器B、三极管T1、二极管D1、二极管D2、电阻R1到电阻R11、电容C1到电容C3和运算放大器U1,所述光电耦合器B上发光二极管的负极连接三极管T1的集电极,光电耦合器B上发光二极管的正极连接上拉电阻R1,光电耦合器B上的三极管的发射极接地并连接引脚2,光电耦合器B上的集电极连接引脚1;所述三极管T1的基极连接二极管D1的负极,二极管D1的正极接地,电阻R2一端连接三极管T1的基极,电阻R3一端连接三极管T1的基极。本发明采用上述原理,该电路不易出现波形异常,空满载振荡的情况,输出电压更稳定且输出电压值可根据实际需要进行调节。

Description

电压稳定的环路电路
技术领域
本发明涉及稳压电路领域,具体涉及电压稳定的环路电路。
背景技术
开关电源是利用现代电力电子技术,控制开关管开通和关断的时间比率,维持稳定输出电压的一种电源,开关电源一般由脉冲宽度调制(PWM)控制IC和MOSFET构成。随着电力电子技术的发展和创新,使得开关电源技术也在不断地创新。目前,开关电源以小型、轻量和高效率的特点被广泛应用几乎所有的电子设备,是当今电子信息产业飞速发展不可缺少的一种电源方式。随着电力电子技术的高速发展,电力电子设备与人们的工作、生活的关系日益密切,而电子设备都离不开可靠的电源,进入80年代计算机电源全面实现了开关电源化,率先完成计算机的电源换代,进入90年代开关电源相继进入各种电子、电器设备领域,程控交换机、通讯、电子检测设备电源、控制设备电源等都已广泛地使用了开关电源,更促进了开关电源技术的迅速发展。现有的稳压电路存在波形异常,空满载振荡,输出电压不稳定等情况,另外现有稳压电路输出电压值无法根据实际情况进行调节。
发明内容
本发明克服了现有技术的不足,提供电压稳定的环路电路,该电路不易出现波形异常,空满载振荡的情况,输出电压更稳定且输出电压值可根据实际需要进行调节。
为解决上述的技术问题,本发明采用以下技术方案:电压稳定的环路电路,包括光电耦合器B、三极管T1、二极管D1、二极管D2、电阻R1、电阻R2、电阻R3、电阻R4、电阻R5、电阻R6、电阻R7、电阻R8、电阻R9、电阻R10、电阻R11、电容C1、电容C2、电容C3和运算放大器U1,所述光电耦合器B上发光二极管的负极连接三极管T1的集电极,光电耦合器B上发光二极管的正极连接上拉电阻R1,光电耦合器B上的三极管的发射极接地并连接引脚2,光电耦合器B上的集电极连接引脚1;所述三极管T1的基极连接二极管D1的负极,二极管D1的正极接地,电阻R2一端连接三极管T1的基极,另一端接地,电阻R3一端连接三极管T1的基极,另一端连接二极管D2的负极,二极管D2的正极连接运算放大器U1的输出端;所述运算放大器U1的同向输入端3连接电容C2一端,电容C2另一端连接电阻R9一端,电阻R9另一端连接输出端Uout,在运算放大器U1的反向输入端2和输出端1之间还依次串联电容C3和电阻R4,在运算放大器U1的反向输入端2上还同时连接下拉电阻R5和电阻R6一端,电阻R6另一端连接VREF端口,在运算放大器U1的同向输入端3还连接电阻R10一端,电阻R10另一端连接电阻R11的定端1,电阻R11的定端2接地,电阻R11的动端3连接电阻R8一端,电阻R8另一端连接电阻R7一端,电阻R7另一端连接输出端Uout;所述运算放大器U1的端口4连接电源VCC,在电源VCC上还连接下拉电容C1,运算放大器U1的端口5接地。
当输出Uout升高,经取样电阻R7、R8、R9、R10和R11组成路线分压后,运算放大器U1的同向输入端3的电压升高,当其超过运算放大器U1反向输入端2的基准电压后,运算放大器U1的输出端1输出高电平,使三极管T1导通,光电耦合器B上的发光二极管发光,光电耦合器B上的三极管导通,光电耦合器B上的引脚2上的电位相应变低,从而改变运算放大器U1上引脚4输出占空比减小,Uout降低。当输出Uout降低时,运算放大器U1上同向输入端电压降低,当其低过运算放大器U1反向输入端的基准电压后,运算放大器U1的输出端1输出低电平,三极管T1不导通,光电耦合器B上的发光二极管不发光,光电耦合器上的三极管不导通,光电耦合器B上的引脚1上的电位升高,从而改变运算放大器U1端口1的输出占空比增大,Uout降低。周而复始,从而使输出电压保持稳定。调节电阻R11的阻值可改变输出电压值。而端口VREF则用于输入基准电压,下拉电阻R5则用于保护运算放大器U1,下拉电阻R2和二极管D1则用于保护三极管T1,而二极管D2的设置则是保证电流只能从运算放大器U1的输出端流向三极管T1的基极,避免电流出现逆流的情况。而电阻R4和电容C3则组成反馈回路,保证环路的稳定性。该电路中设置利用二极管的单向导通反向截止的特性,对本电路中的重要元器件进行保护,电路不易出现波形异常的情况,该电路中输出电压若升高则会通过该电路后使电压降低,如此周而复始使电压保持稳定状态,并且该电路中还设置反馈环路,避免空满载振荡的情况的发生,输出电压更稳定且输出电压值可根据实际需要调节电阻R11的值,从而改变输出电压值,使用更灵活。
进一步的,所述光电耦合器B的型号为UC3842。UC3842采用固定工作频率脉冲宽度可控调制方式,共有8个引脚,具有欠、过压锁定功能,性能更稳定。
进一步的,所述电阻R2和电阻R5阻值相等。
与现有技术相比,本发明的有益效果是:该电路中设置利用二极管的单向导通反向截止的特性,对本电路中的重要元器件进行保护,电路不易出现波形异常的情况,该电路中输出电压若升高则会通过该电路后使电压降低,如此周而复始使电压保持稳定状态,并且该电路中还设置反馈环路,避免空满载振荡的情况的发生,输出电压更稳定且输出电压值可根据实际需要调节电阻R11的值,从而改变输出电压值,使用更灵活。
附图说明
图1为本发明的电路图。
具体实施方式
下面结合附图对本发明作进一步阐述,本发明的实施例不限于此。
实施例:
如图1所示,本发明包括光电耦合器B、三极管T1、二极管D1、二极管D2、电阻R1、10千欧电阻R2、电阻R3、电阻R4、10千欧电阻R5、520欧电阻R6、电阻R7、电阻R8、电阻R9、电阻R10、电阻R11、22微法电容C1、10微法电容C2、10微法电容C3和运算放大器U1,所述光电耦合器B上发光二极管的负极连接三极管T1的集电极,光电耦合器B上发光二极管的正极连接上拉电阻R1,光电耦合器B上的三极管的发射极接地并连接引脚2,光电耦合器B上的集电极连接引脚1;所述三极管T1的基极连接二极管D1的负极,二极管D1的正极接地,电阻R2一端连接三极管T1的基极,另一端接地,电阻R3一端连接三极管T1的基极,另一端连接二极管D2的负极,二极管D2的正极连接运算放大器U1的输出端;所述运算放大器U1的同向输入端3连接电容C2一端,电容C2另一端连接电阻R9一端,电阻R9另一端连接输出端Uout,在运算放大器U1的反向输入端2和输出端1之间还依次串联电容C3和电阻R4,在运算放大器U1的反向输入端2上还同时连接下拉电阻R5和电阻R6一端,电阻R6另一端连接VREF端口,在运算放大器U1的同向输入端3还连接电阻R10一端,电阻R10另一端连接电阻R11的定端1,电阻R11的定端2接地,电阻R11的动端3连接电阻R8一端,电阻R8另一端连接电阻R7一端,电阻R7另一端连接输出端Uout;所述运算放大器U1的端口4连接5v电源VCC,在电源VCC上还连接下拉电容C1,运算放大器U1的端口5接地。电阻R1一端连接的电源为5V电源VCC。光电耦合器B的型号为UC3842。电阻R2和电阻R5阻值相等。三极管T1的型号为BC182LC。
当输出Uout升高,经取样电阻R7、R8、R9、R10和R11组成路线分压后,运算放大器U1的同向输入端3的电压升高,当其超过运算放大器U1反向输入端2的基准电压后,运算放大器U1的输出端1输出高电平,使三极管T1导通,光电耦合器B上的发光二极管发光,光电耦合器B上的三极管导通,光电耦合器B上的引脚2上的电位相应变低,从而改变运算放大器U1上引脚4输出占空比减小,Uout降低。当输出Uout降低时,运算放大器U1上同向输入端电压降低,当其低过运算放大器U1反向输入端的基准电压后,运算放大器U1的输出端1输出低电平,三极管T1不导通,光电耦合器B上的发光二极管不发光,光电耦合器上的三极管不导通,光电耦合器B上的引脚1上的电位升高,从而改变运算放大器U1端口1的输出占空比增大,Uout降低。周而复始,从而使输出电压保持稳定。调节电阻R11的阻值可改变输出电压值。而端口VREF则用于输入基准电压,下拉电阻R5则用于保护运算放大器U1,下拉电阻R2和二极管D1则用于保护三极管T1,而二极管D2的设置则是保证电流只能从运算放大器U1的输出端流向三极管T1的基极,避免电流出现逆流的情况。而电阻R4和电容C3则组成反馈回路,保证环路的稳定性。该电路中设置利用二极管的单向导通反向截止的特性,对本电路中的重要元器件进行保护,电路不易出现波形异常的情况,该电路中输出电压若升高则会通过该电路后使电压降低,如此周而复始使电压保持稳定状态,并且该电路中还设置反馈环路,避免空满载振荡的情况的发生,输出电压更稳定且输出电压值可根据实际需要调节电阻R11的值,从而改变输出电压值,使用更灵活。
如上所述便可实现该发明。

Claims (3)

1.电压稳定的环路电路,其特征在于:包括光电耦合器B、三极管T1、二极管D1、二极管D2、电阻R1、电阻R2、电阻R3、电阻R4、电阻R5、电阻R6、电阻R7、电阻R8、电阻R9、电阻R10、电阻R11、电容C1、电容C2、电容C3和运算放大器U1,所述光电耦合器B上发光二极管的负极连接三极管T1的集电极,光电耦合器B上发光二极管的正极连接上拉电阻R1,光电耦合器B上的三极管的发射极接地并连接引脚2,光电耦合器B上的集电极连接引脚1;所述三极管T1的基极连接二极管D1的负极,二极管D1的正极接地,电阻R2一端连接三极管T1的基极,另一端接地,电阻R3一端连接三极管T1的基极,另一端连接二极管D2的负极,二极管D2的正极连接运算放大器U1的输出端;所述运算放大器U1的同向输入端3连接电容C2一端,电容C2另一端连接电阻R9一端,电阻R9另一端连接输出端Uout,在运算放大器U1的反向输入端2和输出端1之间还依次串联电容C3和电阻R4,在运算放大器U1的反向输入端2上还同时连接下拉电阻R5和电阻R6一端,电阻R6另一端连接VREF端口,在运算放大器U1的同向输入端3还连接电阻R10一端,电阻R10另一端连接电阻R11的定端1,电阻R11的定端2接地,电阻R11的动端3连接电阻R8一端,电阻R8另一端连接电阻R7一端,电阻R7另一端连接输出端Uout;所述运算放大器U1的端口4连接电源VCC,在电源VCC上还连接下拉电容C1,运算放大器U1的端口5接地。
2.根据权利要求1所述的电压稳定的环路电路,其特征在于:所述光电耦合器B的型号为UC3842。
3.根据权利要求1所述的电压稳定的环路电路,其特征在于:所述电阻R2和电阻R5阻值相等。
CN201610009707.8A 2016-01-08 2016-01-08 电压稳定的环路电路 Pending CN105610313A (zh)

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FR2802316A1 (fr) * 1999-12-08 2001-06-15 Mhs Controle de source de courant basse consommation par double alimentation basse regulee en tension
CN201332262Y (zh) * 2008-09-04 2009-10-21 深圳市东辰科技有限公司 一种限流保护电路
CN103441675A (zh) * 2013-08-29 2013-12-11 福尔斯通电子(昆山)有限公司 一种恒流稳压电路
CN204103760U (zh) * 2014-11-06 2015-01-14 航天长峰朝阳电源有限公司 正负输出单路连续可调电源模块
CN104467420A (zh) * 2014-12-04 2015-03-25 洛阳市黄河软轴控制器股份有限公司 一种开关电源稳压电路
CN105207456A (zh) * 2015-10-09 2015-12-30 六安市同心畅能电子科技有限公司 开关电源ac端上抗干扰电容零功耗释放电路
CN205304593U (zh) * 2016-01-08 2016-06-08 成都市宏山科技有限公司 稳压环路电路

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2802316A1 (fr) * 1999-12-08 2001-06-15 Mhs Controle de source de courant basse consommation par double alimentation basse regulee en tension
CN201332262Y (zh) * 2008-09-04 2009-10-21 深圳市东辰科技有限公司 一种限流保护电路
CN103441675A (zh) * 2013-08-29 2013-12-11 福尔斯通电子(昆山)有限公司 一种恒流稳压电路
CN204103760U (zh) * 2014-11-06 2015-01-14 航天长峰朝阳电源有限公司 正负输出单路连续可调电源模块
CN104467420A (zh) * 2014-12-04 2015-03-25 洛阳市黄河软轴控制器股份有限公司 一种开关电源稳压电路
CN105207456A (zh) * 2015-10-09 2015-12-30 六安市同心畅能电子科技有限公司 开关电源ac端上抗干扰电容零功耗释放电路
CN205304593U (zh) * 2016-01-08 2016-06-08 成都市宏山科技有限公司 稳压环路电路

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