CN103138608A - 电源输出调节电路 - Google Patents

电源输出调节电路 Download PDF

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Publication number
CN103138608A
CN103138608A CN2011103867344A CN201110386734A CN103138608A CN 103138608 A CN103138608 A CN 103138608A CN 2011103867344 A CN2011103867344 A CN 2011103867344A CN 201110386734 A CN201110386734 A CN 201110386734A CN 103138608 A CN103138608 A CN 103138608A
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Prior art keywords
circuit
voltage
power supply
pulse
supply output
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CN2011103867344A
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English (en)
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张云飞
刘玉林
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Hongfujin Precision Industry Wuhan Co Ltd
Hon Hai Precision Industry Co Ltd
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Hongfujin Precision Industry Wuhan Co Ltd
Hon Hai Precision Industry Co Ltd
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Priority to CN2011103867344A priority Critical patent/CN103138608A/zh
Priority to TW100145176A priority patent/TWI542982B/zh
Priority to US13/552,747 priority patent/US8873251B2/en
Publication of CN103138608A publication Critical patent/CN103138608A/zh
Pending legal-status Critical Current

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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
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without possibility of reversal 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
    • H02M7/217—Conversion of ac power input into dc power output without possibility of reversal 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
    • H02M7/2176—Conversion of ac power input into dc power output without possibility of reversal 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 comprising a passive stage to generate a rectified sinusoidal voltage and a controlled switching element in series between such stage and the output

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Rectifiers (AREA)

Abstract

一种电源输出调节电路，包括一连接到一交流电源的整流滤波电路和一电压输出电路，所述整流滤波电路将所述交流电源提供的交流电转变为一方波信号，所述电源输出调节电路还包括一降压电路、一反馈电路和一脉宽调制控制电路，所述降压电路包括一接受所述方波信号的初级线圈和一连接到所述电压输出电路的次级线圈，所述脉宽调制控制电路连接到所述初级线圈而控制所述初级线圈的通断，所述反馈电路由一直流电压源供电，所述反馈电路调节所述脉宽调制控制电路输出的脉冲的占空比而控制所述初级线圈在一个周期内的导通时间。

Description

电源输出调节电路
技术领域
本发明涉及一种电源输出电路，特别是指一种可调节输出电压的输出调节电路。
背景技术
在电脑主机中一般安装了电源，其主要用途是将交流电转换为不同电压的稳定直流电，以提供电脑主机中各零组件所需的不同电压使用，但是外接的交流电一般不稳定，则导致电源输出的电压也不稳定，从而影响电脑主机内电子元件的运行。
发明内容
鉴于以上内容，有必要提供一种可提供稳定电压的电源输出调节电路。
一种电源输出调节电路，包括一连接到一交流电源的整流滤波电路和一电压输出电路，所述整流滤波电路将所述交流电源提供的交流电转变为一方波信号，所述电源输出调节电路还包括一降压电路、一反馈电路和一脉宽调制控制电路，所述降压电路包括一接受所述方波信号的初级线圈和一连接到所述电压输出电路的次级线圈，所述脉宽调制控制电路连接到所述初级线圈而控制所述初级线圈的通断，所述反馈电路由一直流电压源供电，所述反馈电路调节所述脉宽调制控制电路输出的脉冲的占空比而控制所述初级线圈在一个周期内的导通时间。
相较于现有技术，上述电源输出调节电路可通过反馈电路自动调节输出的电压，从而提供稳定的输出电压。
附图说明
图1是本发明电源输出调节电路的一较佳实施例的框图。
图2是图1的电源输出调节电路的一电路图。
主要元件符号说明
交流电源 10
整流滤波电路 21
降压电路 22
初级线圈 221
次级线圈 222
脉宽调制控制电路 23
脉冲生成器 231
开关 232
光电耦合器 233
电压输出电路 24
输出端 241
反馈电路 25
电阻 R1、R2、R3
发光二极管 L
可变电阻 RV
三端可调分流基准源 U
正极 Ua
负极 Uc
控制端 Ur
直流电压源 Dc
如下具体实施方式将结合上述附图进一步说明本发明。
具体实施方式
请参阅图1，在本发明的一较佳实施方式中，一电源输出调节电路包括一整流滤波电路21、一降压电路22、一脉宽调制控制电路23、一电压输出电路24和一反馈电路25，该整流滤波电路21连接到一交流电源10。
图2为该电源输出调节电路的电路图，该降压电路22包括一初级线圈221和一次级线圈222，该初级线圈221的一端连接到该整流滤波电路21，该初级线圈221的另一端连接在该脉宽调制控制电路23，该次级线圈222连接到该电压输出电路24，该电压输出电路24包括一输出端241，该输出端241输出直流电压给对应的电脑主机。
该反馈电路25包括电阻R1、R2、R3、一发光二极管L、一可变电阻RV和一个三端可调分流基准源U，该三端可调分流基准源U包括一正极Ua、一负极Uc和一控制端Ur，当控制端Ur所接的电压接近一基准电压时，三端可调分流基准源U的正极Ua和负极Uc之间有非饱和电流流过，且所流过的电流的大小随着控制端Ur所接的电压值的增加而增加、减小而减小。
该可变电阻RV的滑动端通过电阻R1连接到该电压输出电路24的输出端241，该可变电阻RV的固定端通过电阻R3接地，该发光二极管L的正极通过该电阻R2连接到一直流电压源Dc，该直流电压源Dc提供稳定的直流电压，该发光二极管L的负极连接到该三端可调分流基准源U的负极Uc，该三端可调分流基准源U的控制端Ur连接到该可变电阻RV的固定端，该三端可调分流基准源U的正极Ua接地。
该脉宽调制控制电路23包括一脉冲生成器231、一开关232和一光电耦合器233，该光电耦合器233与该发光二极管L相对而受其控制，该光电耦合器233的一端接地，另一端连接到该脉冲生成器231，脉冲生成器231的另一端连接到该开关232而控制开关232的通断，开关232的一端连接到初级线圈221，另一端接地。该光电耦合器233的导通状况受发光二极管L的发光强度控制，发光二极管L的发光强度越大，光电耦合器233中电流越大，则脉冲生成器231产生的脉冲的占空比越小，开关232导通的时间越短，降压电路22在一个周期内工作的时间越短，则传递到次级线圈222的能量越小，电压输出电路24输出的直流电压就越小。
该电源输出调节电路工作时，该交流电源10提供的交流电被整流滤波电路21转变为方波信号，方波信号被传送到降压电路22的初级线圈221，降压电路22的次级线圈222对应产生电压，而后通过电压输出电路24的输出端241输出直流电压给电脑主机。
当交流电源10波动而使输出端241输出的直流电压过高时，该三端可调分流基准源U的控制端Ur的电压升高，流过发光二极管L的电流变大，发光二极管L的发光强度变大，光电耦合器233中电流变大，脉冲生成器231产生的脉冲的占空比变小，开关232导通的时间变短，降压电路22在一个周期内工作的时间变短，则传递到次级线圈222的能量变小，电压输出电路24的输出端241输出的直流电压变小，从而进行调节。
当交流电源10波动而使输出端241输出的直流电压过低时，则三端可调分流基准源U的控制端Ur的电压降低，流过发光二极管L的电流变小，发光二极管L的发光强度变小，光电耦合器233中电流变小，脉冲生成器231产生的脉冲的占空比变大，开关232导通的时间变长，降压电路22在一个周期内工作的时间变长，则传递到次级线圈222的能量变大，电压输出电路24的输出端241输出的直流电压变大，从而进行调节。
且该电源输出调节电路还可通过调节滑动可变电阻RV的电阻值而调节输出端241输出的直流电压的大小，从而适应不同的供电需求。

Claims (8)

1.一种电源输出调节电路，包括一连接到一交流电源的整流滤波电路和一电压输出电路，所述整流滤波电路将所述交流电源提供的交流电转变为方波信号，其特征在于：所述电源输出调节电路还包括一降压电路、一反馈电路和一脉宽调制控制电路，所述降压电路包括一接受所述方波信号的初级线圈和一连接到所述电压输出电路的次级线圈，所述脉宽调制控制电路连接到所述初级线圈而控制所述初级线圈的通断，所述反馈电路由一直流电压源供电，所述反馈电路调节所述脉宽调制控制电路输出的脉冲的占空比而控制所述初级线圈在一个周期内的导通时间。
2.如权利要求1所述的电源输出调节电路，其特征在于：所述反馈电路包括一发光二极管，所述脉宽调制控制电路包括一光电耦合器和一脉冲生成器，所述光电耦合器中的电流大小受控于所述发光二极管的发光强度，所述脉冲生成器产生的脉冲的占空比根据所述光电耦合器中的电流的变化而变化。
3.如权利要求2所述的电源输出调节电路，其特征在于：所述反馈电路还包括一个三端可调分流基准源，所述三端可调分流基准源包括一正极、一负极和一控制端，所述三端可调分流基准源的负极连接所述发光二极管的负极，所述三端可调分流基准源的正极接地，调节所述三端可调分流基准源的控制端上的一电压而可调节所述三端可调分流基准源的正极和负极之间的电流大小。
4.如权利要求3所述的电源输出调节电路，其特征在于：所述发光二极管的正极通过一电阻连接到所述直流电压源，所述直流电压源提供稳定的电压。
5.如权利要求3所述的电源输出调节电路，其特征在于：所述控制端通过一可变电阻连接到所述电压输出电路。
6.如权利要求5所述的电源输出调节电路，其特征在于：所述可变电阻的一滑动端连接到所述电压输出电路，所述可变电阻的一固定端连接到所述控制端，所述滑动端能够通过自身的滑动来调节所述控制端上的电压。
7.如权利要求6所述的电源输出调节电路，其特征在于：所述控制端还通过一电阻接地。
8.如权利要求1所述的电源输出调节电路，其特征在于：所述脉宽调制控制电路包括一开关，所述初级线圈通过所述开关接地，所述开关接收所述脉宽调制控制电路发出的脉冲信号而通断。
CN2011103867344A 2011-11-29 2011-11-29 电源输出调节电路 Pending CN103138608A (zh)

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CN2011103867344A CN103138608A (zh) 2011-11-29 2011-11-29 电源输出调节电路
TW100145176A TWI542982B (zh) 2011-11-29 2011-12-07 電源輸出調節電路
US13/552,747 US8873251B2 (en) 2011-11-29 2012-07-19 Output adjustment circuit for power supply unit

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CN114179967A (zh) * 2021-09-16 2022-03-15 浙江大学 一种海洋浮标系统及电压反馈调节方法

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CN105140875A (zh) * 2015-08-27 2015-12-09 无锡伊佩克科技有限公司 一种车载电源输出光耦隔离电路

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* Cited by examiner, † Cited by third party
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CN105634303A (zh) * 2014-11-07 2016-06-01 鸿富锦精密工业（深圳）有限公司 电子设备供电系统
CN114179967A (zh) * 2021-09-16 2022-03-15 浙江大学 一种海洋浮标系统及电压反馈调节方法

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US20130135909A1 (en) 2013-05-30
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Application publication date: 20130605