Two Stage Wide Voltage Range Efficiency Optimization of Bidirectional DC/DC Converter

The new generation aircraft power supply system requires a bidirectional DC/DC converter with high efficiency and wide voltage input range. To expand the input voltage range, this article adopts a two-stage structure consisting of a Buck-Boost bidirectional voltage regulator circuit and a bidirectional LLC circuit. An efficiency optimization control strategy is proposed for this structure, which can achieve soft switching within a wide voltage input range of two-stage circuits, further reducing circuit losses. To verify the feasibility and effectiveness of the efficiency optimization control strategy, simulation verification was conducted on the circuit losses in both soft and hard switching modes.