Time-Multiplexing Control of Boost Side Interleaved Multiport DC-DC Converter

Multiport dc-dc converters (MPDC) can simultaneously convert the supply voltage to different levels. Multiport dc-dc converters are readily used in various industrial and commercial applications, such as UPS systems, electric vehicles, etc. For high-power applications, to improve the performance and efficiency of converters, the interleaving technique is used. For low-power applications, interleaved multiport dc-dc converters maintain ample power density in the system. This research paper showcases a bidirectional boost-side interleaved multiport dc-dc converter (BIMC). The converter presented provides two different voltage outputs, one stepped up and another stepped down. Through interleaving, the ripple in the input current has been reduced. The converter has become more fault-tolerant and can deliver basic operation even after a transistor failure. Through the bidirectional operation, power can flow from the buck side to the boost end of the converter in the absence of an input. Mathematical formulations, current, and voltage waveforms are derived and shown for both the outputs of the converter, i.e., the boost and buck outputs. Closed-loop control has been designed in order to achieve constant voltage operation. Simulation and hardware results are provided. A comparative study with the conventional MPDC has also been provided.