摘要
随着开关频率和输入电压的不断上升,使得按照临界电感法设计的VRM效率受到很大的约束,通过增大电感值可以减小电流纹波以抑制由此引起的损耗,但是却会影响VRM的瞬态响应。本文提出了一种基于大电感的混合式AVP控制方法及VRM拓扑,通过增大电感提高稳态效率,同时采用了简单的混合式AVP控制使瞬态响应不受占空比饱和的影响。基于所提出的控制方式及拓扑和基于传统的临界电感量,设计制作了两台12V-1.6V/20A的样机并进行比较,试验波形和效率测试结果证明了该控制方法及拓扑在不影响瞬态响应性能的前提下,可大大提高VRM的效率。
With constantly higher frequency and input voltage,the efficiency of the VRM which is designed according to the critical inductance suffers a lot due to high current ripple-related loss.A larger inductance can improve the efficiency and reduce the current ripple,but it may affect the transient response performance due to the duty saturation in the load transient.This paper presents a hybrid AVP control method with larger inductance and related topology for VRM applications,the proposed method can improve the efficiency without sacrificing the transient response performance.The experimental results from two 12V-1.6V/20A prototypes designed with critical and larger inductance respectively verify the effectiveness of efficiency improvement and the transient response of the proposed method.
出处
《电工技术学报》
EI
CSCD
北大核心
2010年第10期115-121,共7页
Transactions of China Electrotechnical Society
