Abstract
The output voltage of Fuel cell or solar cell is often low and varies widely with the load and environmental condition, such as 20–70 V. Therefore, a dc-dc converter for large wide input-voltage range application is often used as the front-end converter in the microgrid. The boost and full-bridge converters are integrated to reduce the cost and filter by sharing the switches. However, voltage stress of the rectifier diode is high and difficult to be selected in the conventional integrated boost full-bridge converter, so it is not suitable for large wide input-voltage range application. Therefore, an improved integrated boost full-bridge converter is proposed. Voltage stress of rectifier diodes, voltage stress of switches, and size and weight of the input and output filters are reduced. Operating principle of the proposed converter is illustrated. Design guidelines and example are given. Simulation results verify the theoretical analysis.
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