The ANALYSIS OF AN Alternating Phase Shift Control for Fuel Cell Power System

Abstract

This paper investigates a novel PWM scheme for twophase interleaved boost converter with voltage
multiplier for fuel cell power system by combining Alternating Phase Shift (APS) control and traditional
interleaving PWM control. The APS control is used to reduce the voltage stress on switches in light load
while the traditional interleaving control is used to keep better performance in heavy load. The boundary
condition for swapping between APS and traditional interleaving PWM control is derived. Based on the
above analysis, a full power range control combining APS and traditional interleaving control is
proposed. Loss breakdown analysis is also given to explore the efficiency of the converter. Finally, it is
verified by experimental results. Also, the reverse recovery problem of all diodes is mitigated and zerocurrent-switching (ZCS) turn-on operation of the main switches
is established as well. In addition, the passive clamp circuits are employed to suppress the voltage spikes
across the main switches during turn-off instants. The operating principles and steady-state analysis of the
proposed converter in continuous condition mode are explained. Finally, the simulation and experimental
results of prototype 25–400 V circuit with 200 W output power are provided to verify the performance of
presented topology.