A
High Step-Up Converter With a Voltage Multiplier Module for a Photovoltaic
System
Abstract—Anovel
high step-up converter is proposed for a frontend photovoltaic system. Through
a voltage multiplier module, an asymmetrical interleaved high step-up converter
obtains high stepup gain without operating at an extreme duty ratio. The voltage
multiplier module is composed of a conventional boost converter and coupled
inductors. An extra conventional boost converter is integrated into the first
phase to achieve a considerably higher voltage conversion ratio. The two-phase
configuration not only reduces the current stress through each power switch,
but also constrains the input current ripple, which decreases the conduction losses
of metal–oxide–semiconductor field-effect transistors (MOSFETs). In addition,
the proposed converter functions as an active clamp circuit, which alleviates
large voltage spikes across the power switches. Thus, the low-voltage-rated
MOSFETs can be adopted for reductions of conduction losses and cost. Efficiency
improves because the energy stored in leakage inductances is recycled to the
output terminal. Finally, the prototype circuit with a 40-V input voltage,
380-V output, and 1000- W output power is operated to verify its performance.
The highest efficiency is 96.8%.
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