A Novel Control Scheme of Synchronous Buck Converter for ZVS in Light-Load Condition

This paper proposes a new control technology that enables a synchronous rectifier (SR) buck converter to realize zero voltage switching (ZVS) in light load condition. The SR control technique is applicable to dc low voltage output because the replacement of output rectifier diode by MOSFET can minimize conduction losses and increase the efficiency of the whole circuit. However, the technique cannot achieve good efficiency in light load condition. The control technique introduced in this paper enables an SR buck converter to carry out ZVS in light load condition to increase efficiency. No extra auxiliary switches or RLC passive components are required; thus, it is low cost and easy to control. The output of buck converter with 5 V/25 W featured by SR is developed in this paper; the availability of the technique introduced, herein, is also proven. The experimental results are satisfactory.

[1]  Jeong-Hwan Yang,et al.  Digital Resistive Current (DRC) Control for the Parallel Interleaved DC–DC Converters , 2008 .

[2]  Robert W. Erickson,et al.  Fundamentals of Power Electronics , 2001 .

[3]  Abraham Pressman,et al.  Switching Power Supply Design , 1997 .

[4]  H. Wiegman.  A resonant pulse gate drive for high frequency applications , 1992, [Proceedings] APEC '92 Seventh Annual Applied Power Electronics Conference and Exposition.

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

[6]  R. D. Middlebrook.  Small-signal modeling of pulse-width modulated switched-mode power converters , 1988 .

[7]  Sima Dimitrijev,et al.  Controlling a DC-DC converter by using the power MOSFET as a voltage controlled resistor , 2000 .

[8]  Robert W. Brodersen,et al.  A low-voltage CMOS DC-DC converter for a portable battery-operated system , 1994, Proceedings of 1994 Power Electronics Specialist Conference - PESC'94.

[9]  E. Adib,et al.  Zero-Voltage-Transition PWM Converters With Synchronous Rectifier , 2010, IEEE Transactions on Power Electronics.

[10]  Pedro Alou Cervera,et al.  Current Self-balance Mechanism in Multiphase Buck Converter , 2008, PESC 2008.

[11]  Robert W. Brodersen,et al.  High-efficiency low-voltage dc-dc conversion for portable applications , 1994 .

[12]  A.Q. Huang,et al.  Monolithically integrated boost Converter Based on 0.5-/spl mu/m CMOS Process , 2005, IEEE Transactions on Power Electronics.

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

[14]  I. Batarseh,et al.  Zero-Voltage-Switching DC–DC Converters With Synchronous Rectifiers , 2008, IEEE transactions on power electronics.

[15]  G. Rincón-Mora,et al.  A comprehensive power analysis and a highly efficient, mode-hopping DC-DC converter , 2002, Proceedings. IEEE Asia-Pacific Conference on ASIC,.

[16]  Yan-Fei Liu,et al.  A Nonisolated ZVS Asymmetrical Buck Voltage Regulator Module With Direct Energy Transfer , 2009, IEEE Transactions on Industrial Electronics.

[17]  Ka Nang Leung,et al.  A voltage-mode PWM buck regulator with end-point prediction , 2006, IEEE Transactions on Circuits and Systems II: Express Briefs.

[18]  M. Barai,et al.  Dual-Mode Multiple-Band Digital Controller for High-Frequency DC–DC Converter , 2009, IEEE Transactions on Power Electronics.

[19]  Fred C. Lee,et al.  Improved light-load efficiency for synchronous rectifier voltage regulator module , 2000 .

[20]  S. Saggini,et al.  Synchronous–Asynchronous Digital Voltage-Mode Control for DC–DC Converters , 2007, IEEE Transactions on Power Electronics.

[21]  Xu Zhang,et al.  Multimode Digital Controller for Synchronous Buck Converters Operating Over Wide Ranges of Input Voltages and Load Currents , 2010, IEEE Transactions on Power Electronics.