Effect of the Output Impedance of Active Clamp Topology in Multiphase Converters

Passive current sharing in multiphase converters, where resistive losses are not dominant, is a quite complex goal. In this paper an averaged model of an active clamp converter was obtained. It has been checked that these topologies present high output impedance. This property is used like a lossless passive equalization. Simulated results of the average model accuracy and current sharing are presented.

[1]  T. Ninomiya,et al.  Effect of clamp capacitor on the stability of active-clamp DC-DC converters , 1998, PESC 98 Record. 29th Annual IEEE Power Electronics Specialists Conference (Cat. No.98CH36196).

[2]  Duarte C.M.C.,et al.  A NEW FAMILY OF ZVSPWM ACTIVE CLAMPING DC-TO-DC CONVERTERS: ANALYSIS, DESIGN, AND EXPERIMENTATION , 1996 .

[3]  I. D. Jitaru,et al.  A new high frequency, zero-voltage switched, PWM converter , 1992, [Proceedings] APEC '92 Seventh Annual Applied Power Electronics Conference and Exposition.

[4]  Seth R. Sanders,et al.  Architecture and IC implementation of a digital VRM controller , 2003 .

[5]  S. Birca-Galateanu,et al.  Small-signal characterization of the forward-flyback converters with active clamp , 1998, APEC '98 Thirteenth Annual Applied Power Electronics Conference and Exposition.

[6]  Robert W. Erickson,et al.  Averaged switch modeling of active-clamped converters , 2001, IECON'01. 27th Annual Conference of the IEEE Industrial Electronics Society (Cat. No.37243).

[7]  Ivo Barbi,et al.  A new family of ZVS-PWM active-clamping DC-to-DC boost converters: analysis, design, and experimentation , 1997 .

[8]  V. Ramanarayanan,et al.  A unified model for the ZVS DC-DC converters with active clamp , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[9]  Fred C. Lee,et al.  Utilization of an active-clamp circuit to achieve soft switching in flyback converters , 1994, Proceedings of 1994 Power Electronics Specialist Conference - PESC'94.

[10]  I. Barbi,et al.  A family of ZVS-PWM active-clamping DC-to-DC converters: synthesis, analysis, design, and experimentation , 1997 .