Optimal Design of Current Source Gate Driver for a Buck Voltage Regulator Based on a New Analytical Loss Model

The superior advantages of a new current-source resonant driver are verified thoroughly by the analytical analysis, simulation and experimental results. A new accurate analytical loss model of the power MOSFET driven by a current-source resonant gate driver is developed. Closed-formed analytical equations are derived to investigate the switching characteristics due to the parasitic inductance. The modeling and simulation results prove that compared to a voltage driver, a current-source resonant driver significantly reduces the propagation impact of the common source inductance during the switching transition at very high switching frequency, which leads to a significant reduction of the switching transition time and the switching loss. Based on the proposed loss model, a general method to optimize the new resonant driver is proposed and employed in the development of a 12V synchronous buck voltage regulator (VR) prototype at 1MHz switching frequency. The level-shift circuit and digital implementation of complex programmable logic device (CPLD) are also presented. The analytical modeling matches the simulation results and experimental results very well. Through the optimal design, a significant efficiency improvement is achieved. More importantly, compared to other state of the art VR approaches, the current-source driver is very promising from the standpoints of both performance and cost-effectiveness.

[1]  F.C. Lee,et al.  Analytical loss model of power MOSFET , 2006, IEEE Transactions on Power Electronics.

[2]  F. C. Lee,et al.  A novel resonant gate driver for high frequency synchronous buck converters , 2002 .

[3]  Sheng Ye,et al.  A New Resonant Gate Drive Circuit for Synchronous Buck Converter , 2007, IEEE Transactions on Power Electronics.

[4]  Sheng Ye,et al.  A new dual channel resonant gate drive circuit for synchronous rectifiers , 2006, Twenty-First Annual IEEE Applied Power Electronics Conference and Exposition, 2006. APEC '06..

[5]  F.C. Lee,et al.  A self-driven soft-switching voltage regulator for future microprocessors , 2005, IEEE Transactions on Power Electronics.

[6]  W. Eberle,et al.  A novel high performance resonant gate drive circuit with low circulating current , 2006, Twenty-First Annual IEEE Applied Power Electronics Conference and Exposition, 2006. APEC '06..

[7]  F.C. Lee,et al.  A resonant MOSFET gate driver with efficient energy recovery , 2004, IEEE Transactions on Power Electronics.

[8]  Shintaro Ono,et al.  Design for Efficiency Improvement and Future prediction in Multi Chip Module for DC-DC Converter , 2006 .

[9]  Kaiwei Yao,et al.  Tapped-inductor buck converter for high-step-down DC-DC conversion , 2005, IEEE Transactions on Power Electronics.

[10]  T. Lopez,et al.  A detailed analysis of a resonant gate driver for PWM applications , 2003, Eighteenth Annual IEEE Applied Power Electronics Conference and Exposition, 2003. APEC '03..

[11]  H. Shah,et al.  Analytical modeling and experimental evaluation of interconnect parasitic inductance on MOSFET switching characteristics , 2004, Nineteenth Annual IEEE Applied Power Electronics Conference and Exposition, 2004. APEC '04..

[12]  A. Sawle,et al.  High frequency DC:DC power conversion: the influence of package parasitics , 2003, Eighteenth Annual IEEE Applied Power Electronics Conference and Exposition, 2003. APEC '03..

[13]  M.G. Egan,et al.  An assessment of resonant gate drive techniques for use in modern low power dc-dc converters , 2005, Twentieth Annual IEEE Applied Power Electronics Conference and Exposition, 2005. APEC 2005..

[14]  F.C. Lee,et al.  Two novel soft-switched, high frequency, high-efficiency, non-isolated Voltage Regulators-the phase-shift buck converter and the matrix-transformer phase-buck converter , 2005, IEEE Transactions on Power Electronics.

[15]  F.C. Lee,et al.  12V VR Efficiency Improvement based on Two-stage Approach and a Novel Gate Driver , 2005, 2005 IEEE 36th Power Electronics Specialists Conference.

[16]  Dragan Maksimovic,et al.  A MOS gate drive with resonant transitions , 1991, PESC '91 Record 22nd Annual IEEE Power Electronics Specialists Conference.