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www.pgembeddedsystems.com
A High Step-Up DC to DC Converter Under
Alternating Phase Shift Control for Fuel Cell
Power System
ABSTRACT
This paper investigates a novel pulse width modulation (PWM) scheme for two-phase
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.
CIRCUIT DIAGRAM
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Existing System:
High step-up ratio can be achieved by combining classical boost converter with switched
inductors, coupled inductors, high-frequency transformer, or switched capacitor. They can obtain
high step-up ratio with high efficiency, low-voltage stress, and low electromagnetic interference.
In order to reduce output fuel cell stack output current ripple or the dc/dc converter input current
ripple, either a passive filter or active filter can be used, however, this will increase the
complexity of the system. In fact, interleaving the dc/dc converter can reduce the input current
ripple of the dc/dc converter.
Proposed System:
This project investigates a novel PWM scheme for two-phase interleaved boost converter
with voltage multiplier for fuel cell power system by combining APS 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 aforementioned 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.
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TOOLS AND SOFTWARE USED:
 MP LAB
 ORCAD/PSPICE
 MATLAB/SIMULINK
OUTPUT:
 HARDWARE
 SIMULATION
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