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| A Hybrid Adaptive Voltage Position Control and 12V Voltage Regulator Module |
| Yuan Wei, Zhang Junming, Qian Zhaoming |
| Zhejiang University Hangzhou 310027 China |
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Abstract 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.
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Received: 26 March 2009
Published: 04 March 2014
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2010, Vol. 25 
