一种新型高精度数字DC-DC变换器控制方法研究  

A New High-precision Digital DC-DC Converter Control Method

作　　者：史永胜[1] 史耀华[1] 张普雷[1] 

机构地区：[1]陕西科技大学电气与信息工程学院,陕西西安710021

出　　处：《计算机测量与控制》2010年第4期841-843,847,共4页Computer Measurement &Control

基　　金：陕西省教育厅专项研究计划(07JK188)

摘　　要：提出了一种新型的数字DC-DC变换器的控制方法,与电压模式数字控制结构相比在电流内环加入数字斜波补偿环节,该方法不依赖DPWM高分辨率来提高输出精度,有效抑制极限环震荡,而且可以降低系统时钟频率达到节约成本的目的;在开关频率300kHz下通过Matlab仿真及稳态、瞬态的分析,最后通过Buck变换器功率级和带有ADC的Xilinx Spartan IIFPGA平台实验验证了该控制结构的有效性;同时这种控制思想也可以应用到其他数字开关变换器IC控制结构设计中。Compared with voltage-mode digital control structure, a new method of digital DC-DC converter control is proposed by adding the digital-ramp in the current inner. The method doesn＇ t depend on DPWM resolution to increase the output precision, and inhibit the oscillation of limit-cycle effectively. It also can reduce the system clock frequency to achieve cost savings objectives. Through Matlab simulation, Buck converter and Xilinx Spartan Ⅱ FPGA platform with ADC for experiments at 300kHz and steady-state, transient analysis, the effectiveness of the control structure is verified. The method of such control can also he applied to IC design of other digital switching converters.

关 键 词：DC—DC变换器 数字脉宽调制 极限环 

分 类 号：TM40[电气工程—电器]