新型混合DPWM方法及其实现  

A novel Hybrid DPWM Strategy and its Implementation

作　　者：高艳霞[1] 徐妍萍[1] 郭水保[1] 

机构地区：[1]上海大学,上海200072

出　　处：《电力电子技术》2009年第6期84-86,共3页Power Electronics

基　　金：台达环境与教育基金会<电力电子科教发展计划>(DERO2007014)~~

摘　　要：数字脉宽调制器(Digital Pulse Width Modulator,简称DPWM)是数字控制开关电源的核心。在DPWM的实现中,存在DPWM分辨率与系统工作频率之间的矛盾。提出了一种新型混合高分辨率DPWM方法,该方法利用现场可编程门阵列(Field Programmable Gate Array,简称FPGA)中数字时钟管理(Digital Clock Manager,简称DCM)的倍频及移相功能、高频计数比较模块及数字"抖动"方法,在系统硬件工作频率为32MHz,开关频率为1MHz的条件下,实现了11位的DPWM分辨率。论述了各模块的原理及实现方法,并给出了基于Virtex-IIFPGA的仿真和实验结果。Digital PWM （DPWM） is known as the crucial module for digitally controlled switching mode power supply. There is a contradictory between the resolution of DPWM and the system frequency.This paper proposes a novel hybrid DPWM Strategy,which combines frequency-multiple and phase-shift by digital clock management （DCM） ,a fast counter/comparator block and a dithering approach.Tile functions of all blocks are described,the simulative and experimental results based on a Virtex-11 FPGA prove the performance of the proposed DPWM.

关 键 词：脉宽调制器 分辨率 移相/数字抖动 

分 类 号：TN787[电子电信—电路与系统]