CN106877667A - 基于uc3875的移相全控逆变桥的开关电源 - Google Patents

基于uc3875的移相全控逆变桥的开关电源 Download PDF

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CN106877667A
CN106877667A CN201510914817.4A CN201510914817A CN106877667A CN 106877667 A CN106877667 A CN 106877667A CN 201510914817 A CN201510914817 A CN 201510914817A CN 106877667 A CN106877667 A CN 106877667A
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power supply
controlled
entirely
phase shift
switching power
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李福来
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    • 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
    • H02H7/125—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 rectifiers
    • H02H7/1252—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 rectifiers responsive to overvoltage in input or output, e.g. by load dump
    • 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

Abstract

基于UC3875的移相全控逆变桥的开关电源，由主电路、过压保护电路、过流保护电路和可调环节部分组成，所述主电路由EMI滤波器和移相控制ZVS-PWM-DC/DC全桥变换器组成，所述过压保护电路采用NE555组成；所述过流保护电路一旦过流，比较器输出高电平，UC3875锁定跳停，电源停止工作。基于UC3875的移相全控逆变桥的开关电源，ZVS相控PWM方式因其具有开关损耗小，开关强度低，电效率高，可控性好，稳定可靠，控制精度高，纹波系数小等诸多优点。

Description

基于UC3875的移相全控逆变桥的开关电源
技术领域
本发明涉及基于UC3875的移相全控逆变桥的开关电源。
背景技术
传统的全桥PWM变换器适用于输出低电压大功率的情况，以及电源电压和负载电流变化大的场合。其优点是开关频率固定，便于控制。为了提高变换器的功率密度，减少单位输出功率的体积和重量，需将开关频率提高。将谐振变换器与PWM技术结合起来构成软开关PWM控制方案，既能实现功率开关的软开关特点，又能实现恒频控制，是当今电力电子技术领域研究热点之一。全桥移相控制软开关PWM变换器是直流电源实现高频化的理想拓扑之一，尤其是在中大功率变换器应用场合，用软开关技术实现的DC-DC变换器其效率可达90%以上，传统AC-DC变换器的广泛应用还带来了较低的转换效率。
发明内容
为解决上述问题，本发明设计了基于UC3875的移相全控逆变桥的开关电源。
本发明解决其技术问题所采用的技术方案是：基于UC3875的移相全控逆变桥的开关电源由主电路、过压保护电路、过流保护电路和可调环节部分组成。
所述主电路，EMI滤波器和移相控制ZVS-PWM-DC/DC全桥变换器组成。将单相22OV/50Hz市电输入进行整流和滤波，得到300V左右的直流电压，供给后级DC/DC全桥变换器输入端压敏电阻，缓冲开机时出现过大电流，然后经过由一对共模电感以及滤波电容组成的EMI滤波器滤波。通过调节移相角的大小来调节输出脉冲的宽度，在输出端有输出分压信号返回UC3875芯片与标准信号比较形成反馈以此来达到调压的目的。
所述过压保护电路，电源过压保护采用NE555组成。
所述过流保护电路，互感线圈从变压器原边取样后经全波整流RC滤波后所取得一定电压与参考电压进行比较，比较器LM393的输出对UC3875的CS脚直接进行控制，一旦过流，比较器输出高电平，UC3875锁定跳停，电源停止工作。
所述可调环节部分，采用专用极性变换集成电路ICL7660和外部的两只电容构成的电荷泵进行DC/DC电压极性转换。其转换效率高，为95%，电能消耗小。静态电流为，输出电流为10~20mA。输入为UC3875的端输出的精密5V输出。后接一个比例运放将输出放大为15V，用于调整的标准电压接入UC3875的EA+端当作标准电压通过调整标准参考电压来调节输出。
本发明的有益效果是，基于UC3875的移相全控逆变桥的开关电源，ZVS相控PWM方式因其具有开关损耗小，开关强度低，电效率高，可控性好，稳定可靠，控制精度高，纹波系数小等诸多优点。
附图说明
下面结合附图对本发明进一步说明。
图1是移向全控桥主电路原理图。
具体实施方式
在图1中，由EMI滤波器和移相控制ZVS-PWM-DC/DC全桥变换器组成。将单相22OV/50Hz市电输入进行整流和滤波，得到300V左右的直流电压，供给后级DC/DC全桥变换器输入端压敏电阻，缓冲开机时出现过大电流，然后经过由一对共模电感以及滤波电容组成的EMI滤波器滤波。由输入后整流桥后面的Q1，Q2，Q3，Q4四个主功率MOSFET和C1~C4组成，通过控制芯片UC3875输出移相PWM控制信号对四个MOSFET进行控制，每个桥臂的两个功率管成180°互补导通，两个桥臂的导通相差一个相位，即移相角。通过调节移相角的大小来调节输出脉冲的宽度，在输出端有输出分压信号返回UC3875芯片与标准信号比较形成反馈以此来达到调压的目的。
电源过压保护方案采用E555组成。互感线圈从变压器原边取样后经全波整流RC滤波后所取得一定电压与参考电压进行比较，比较器LM393的输出对UC3875的CS脚直接进行控制，一旦过流，比较器输出高电平，UC3875锁定跳停，电源停止工作。

Claims (5)

1.基于UC3875的移相全控逆变桥的开关电源，由主电路、过压保护电路、过流保护电路和可调环节部分组成。
2.根据权利要求1所述的基于UC3875的移相全控逆变桥的开关电源，其特征是所述主电路由EMI滤波器和移相控制ZVS-PWM-DC/DC全桥变换器组成。
3.根据权利要求1所述的基于UC3875的移相全控逆变桥的开关电源，其特征是所述过压保护电路采用NE555组成。
4.根据权利要求1所述的基于UC3875的移相全控逆变桥的开关电源，其特征是所述过流保护电路一旦过流，比较器输出高电平，UC3875锁定跳停，电源停止工作。
5.根据权利要求1所述的基于UC3875的移相全控逆变桥的开关电源，其特征是所述可调环节部分采用专用极性变换集成电路ICL7660和外部的两只电容构成的电荷泵进行DC/DC电压极性转换。
CN201510914817.4A 2015-12-13 2015-12-13 基于uc3875的移相全控逆变桥的开关电源 Pending CN106877667A (zh)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110798083A (zh) * 2019-12-02 2020-02-14 中国美术学院 一种555相控软启动限流保护直流稳压电源
CN113829940A (zh) * 2021-10-09 2021-12-24 郑州信息科技职业学院 一种基于nb-iot的电动自行车智能充电系统及其工作方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110798083A (zh) * 2019-12-02 2020-02-14 中国美术学院 一种555相控软启动限流保护直流稳压电源
CN113829940A (zh) * 2021-10-09 2021-12-24 郑州信息科技职业学院 一种基于nb-iot的电动自行车智能充电系统及其工作方法

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Application publication date: 20170620