High step up interleaved forward-flyback boost converter with three-winding coupled inductors

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I3E Technologies

HIGH STEP-UP INTERLEAVED FORWARD-FLYBACK BOOST CONVERTER WITH
THREE-WINDING COUPLED INDUCTORS
ABSTRACT
A novel high step-up interleaved converter for high power high-voltage applications is
proposed in this paper. Through three-winding coupled inductors, a high step-up conversion with
high efficiency is obtained. The proposed converter not only reduces the current stress, but also
constrains the input current ripple, which decreases the conduction losses and lengthens the life
time of input source. In addition, due to the lossless passive clamp performance, leakage energy
is recycled to the output terminal. Hence, large voltage spikes across the main switches are
alleviated and the efficiency is improved. Even, the low-voltage stresses on semiconductor
components are substantially lower than the output voltage. Finally, the prototype circuit with
input voltage 48 V, output voltage 380 V, and output power 2 kWis operated to verify its
performance. The highest efficiency is 96.5%, and the full-load efficiency is 92.6%.

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