多相buck转换器的新型电压滞环控制研究  

Research of novel voltage-mode hysteretic control techniques for multiphase buck converter

作　　者：侯士江[1] 周俊杰[2] 

机构地区：[1]燕山大学工业设计系 [2]燕山大学电气工程学院

出　　处：《电子技术（上海）》2008年第10期56-60,共5页Electronic Technology

摘　　要：随着处理器技术的发展,电压调节模块面临更高的要求,其主拓扑和控制方式也都有了很大的发展。交错技术能够以较低的开关频率实现高频输出电压波动、具有纹波互消、相间分流等优点,而电压滞环控制具有电路简单、无需反馈环路补偿、负载瞬态响应以及不限制开关导通时间等优点,因此二者的结合成为一种发展趋势。本文首先介绍了交错并联buck拓扑和电压滞环控制的工作原理,并进一步给出单纯电压滞环控制的buck转换器的仿真,阐述了其优缺点,此基础上提出了新型电压滞环控制方式,并对其工作原理进行了分析,最后通过仿真及实验验证了这种新型控制方式的优越性。With the development of microprocessors,voltage regulator modules(VRMs)are required to have many strict and challenging specifications.Its main topology and control scheme must follow the fast-developing trend.The interleaving technique has several advantages such as the high frequency output voltage ripple with lower switching frequency,ripple cancellation,current division(sharing)between the phases.On the other hand,the voltage-mode hysteretic control has many advantages over many other control techniques that include simplicity,no feedback loop compensation is needed,near instantaneous response to load transients,and no limitations on the switches ON time.From this,it is clear that combining the voltage-mode hysteretic control technique with the interleaving technique will prevail.In this paper, multiphase buck converter and working principle of the voltage-mode hysteretic control are first introduced.Then the simulations of multiphase buck converter utilizing the voltage-mode hysteretic control are provided,and its advantages and limitations are discussed.Based on this,a novel voltage- mode hysteretic control scheme is proposed and its working principle is analyzed.Finally its advantages are proved by pspice simulation and experiments.

关 键 词：电压调节模块 buck转换器 交错技术 电压滞环控制 纹波互消 

分 类 号：TM46[电气工程—电器]