A Three-Port Five-Channel Converter With High Output Current and Wide Voltage Range

This article proposes a three-port converter utilizing five power channels. Four of these channels form an output-parallel multiphase interleaved <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LLC</i> structure, designed to transfer the energy to high power and current loads. The other channel operates as an equivalent multilevel dual active bridge (DAB) converter, connects to a wide voltage range load and allows for bidirectional energy flow. The four <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LLC</i> channels efficiently transfer power while significantly enhancing the soft-switching capability of the DAB channel. In addition, the high-voltage side switches operate with half voltage stress, which not only mitigates the challenges associated with soft-switching but also improves the overall reliability of the converter. To further optimize the performance, a modulation method is introduced for the proposed converter, enabling phase-shift control of four LLC channels and reducing the peak current in the DAB converter. Finally, a 3-kW prototype is developed to validate the effectiveness of the proposed converter. One port of the prototype has half of the input voltage stress, enabling it to handle a high input voltage of 750 V, while another port achieves a wide output voltage range of 40–200 V, and the third port delivers a high output current of 40 A.