低纹波双电池直流稳压电源设计与实现.docVIP

低纹波双电池直流稳压电源设计与实现 　　摘 要： 为实现供电电源的低纹波输出，采用纹波控制方法，设计了一种双电池充供欠满自主切换的低纹波直流电源，并对电源进行纹波特性测试。原始信号通过电压采集电路传输给控制主电路，控制主电路依据采集到的电压信号和继电器开关的通断原则来控制充供电选择电路，可供电电池通过线性电压调整电路即可实现一路5 V和两路可调电压输出，实现了从充电到供电的低纹波直流稳压输出。电源纹波测试采用同轴电缆测试装置，测试数据表明：低纹波直流稳压电源运行状况良好，输出电压稳定，与其他直流电源相比，在纹波控制方面具有较大优势。 　　关键字： 直流电源； 低纹波； 双电池； 通断原则 　　中图分类号： TN86?34； TP303+.3 文献标识码： A 文章编号： 1004?373X（2016）14?0150?04 　　Design and implementation of low?ripple dual battery DC regulated power supply 　　LI Jie， CHENG Weibin， FENG Du， MAN Rongjuan 　　（School of Electronic Engineering， Xi’an Shiyou University， Xi’an 710065， China） 　　Abstract： In order to realize the low?ripple output of the power supply， a low?ripple dual battery DC power supply was designed with the ripple control method， which can switch from the low power state to full power state automatically. The ripple characteristic test for the power supply was performed. The original signal is transmitted to the main control circuit through the voltage acquisition circuit， and then the main control circuit is used to control the charging and supplying power selection circuit according to the on?off principle of the relay switch and collected voltage signal. The power supply battery can realize +5V voltage output in one channel and adjustable voltage output in two channels through the linear voltage adjustment circuit. The low ripple DC voltage regulator output from charging state to supplying power state was implemented. A coaxial?cable testing device was adopted in power supply ripple test. The test data shows that the low ripple DC regulated power supply has good running condition and greater advantage in ripple control in combination with other DC power supply， and its output voltage is stable. 　　Keywords： DC power supply； low ripple； dual battery； on?off principle 　　0 引 言 　　提高参数测量精确度的重要方法是降低各类误差，其中直流电源纹波是产生误差的主要根源之一。二极管工频整流后直流电源有较大的工频纹波，需要较大容量滤波器件；开关电源采用高频工作，滤波器件体积和容量降低[1]，但存在高频纹波，虽然通过增加电路滤波器件可降低纹波，有时可达几毫伏，但仍达不到高精度测量的要求[2]。 　　本身没有纹波的直流电池供电是一种较好的选择，可