采用定点数的数字DC-DC控制器设计  

Design and Implementation of Digital DC-DC Converter Controller Using Fixed Point Number

作　　者：郑宇亮[1] 魏廷存[1] 李峰[1] 

机构地区：[1]西北工业大学计算机学院,陕西西安710072

出　　处：《计算机测量与控制》2012年第1期98-101,共4页Computer Measurement &Control

基　　金：国家自然科学基金(No.60972157)

摘　　要：提出了一种应用于数字DC-DC变换器的高精度定点数字控制器的设计方法;在数字控制器的控制率运算中,将浮点数格式的控制参数转化为定点数格式,从而达到简化硬件电路的目的;该设计方法应用于降压型数字DC-DC变换器的设计中,并完成了基于FPGA的测试和验证;在500kHz的开关频率下,输出电压纹波为14mV,对于±0.5A的负载电流跳变,控制器响应时间约为330μs。测试结果表明,该设计方法在保持控制精度的前提下,可简化硬件电路的设计复杂度,并改善系统的瞬态性能。A design method of high precision fixed-point digital controller,which is applied to digital DC-DC converter,is proposed.In order to simplify the complexity of hardware circuit,the control parameters of floating-point format are converted into fixed-point format during the operation of the digital controller.The design method is applied to digital DC-DC converter,and the testing and verification based on FPGA are accomplished.When switching frequency is 500KHz,output voltage ripple is 14mV,and when load current varies ±0.5A,response time of the controller is about 330μs.The test results indicate that this design method not only preserves the control precision but also simplifies the complexity of hardware circuit as well as improves the system transient performances.

关 键 词：DC-DC变换器 数字控制器 定点数 FPGA 瞬态性能 

分 类 号：TN47[电子电信—微电子学与固体电子学]