一种高效率的开关电源并联供电系统研制  

Research of the High-efficiency Parallel Power Supply System with the Switch Power Supply Module

作　　者：肖卫初[1] 陈伟宏[1] 

机构地区：[1]湖南城市学院通信与电子工程学院,湖南益阳413002

出　　处：《控制工程》2013年第3期452-455,共4页Control Engineering of China

基　　金：国家自然科学基金资助项目(61105066);湖南省自然科学基金资助项目(13JJ6072)

摘　　要：针对以往开关电源并联供电系统还存在系统效率低和各路输出电流相对误差的绝对值较高的缺点，研制了一种由ATmega64单片机控制的高效率开关电源模块并联供电系统。该单片机片内自带10位PWM功能和10位A／D转换器，产生PWM波和实现A／D转换．使外围电路更简单；采用两路独立的全桥式DC．AC—DC模块、电流采样与放大电路，并分别与单片机组成闭环反馈模式来进行分流，提高了系统效率、减少了各路输出电流相对误差的绝对值。测试结果表明，该系统效率高达94．1％以上，实现了自动分流和按设定比例分流，每路模块输出电流相对误差的绝对值分别为0～0．8％和0．2％～1．24％。The high-efficiency parallel power supply system with switching power supply modules controlled by an ATmega64 microcontroller is developed. The system has the 10-bit PWM function and the 10-bit A/D converter in the microcontroller chip, which is used to generate the PWM wave and implement the A/D conversion with the more simple peripheral circuits. The automation shunt is achieved by using two independent full-bridge DC-AC-DC module, the current sampling and amplifying circuit, and forming the closedloop feedback mode with the MCU, which improves the efficiency of the system and reduces the absolute value of the relative error of each output current. The test results show that the system efficiency is more than 94. 1% , and the automatic shunt and the shunt by setting the ratio are implemented with the absolute value of each module output current from 0 to 0. 8 % and 0. 2 % to 1.24 % respectively.

关 键 词：全桥变换器 并联 效率 脉宽调制 比例电流 电源 

分 类 号：TP27[自动化与计算机技术—检测技术与自动化装置]