基于变频-移相混合控制的L-LLC谐振双向DC-DC变换器

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Abstract Considering the development and application of the energy storage systems in DC distribution system, bidirectional DC-DC converters with high power conversion efficiency and wide adjustable range are required. According to the hybrid control of variable-frequency (VF) and phase-shift (PS), a L-LLC resonant bidirectional DC-DC converter was proposed in this paper. It not only has wide adjustable ranges of the DC voltage gain and the transmission power, but also can realize the zero-voltage switching for input switches and zero-current switching for output rectifiers simultaneously. That leads to a high overall efficiency. Operation behaviors and characteristics of the converter under single VF or PS control were described. Then the rationality of the hybrid control was proved in theory, and an easy implementation was given. The experimental results of the prototype confirmed the validity of the theoretical analysis as well as the superior performance of L-LLC converter in operational efficiency and adjustable range.

Key words： Bidirectional DC-DC converter operation mode analysis variable-frequency pattern phase-shift pattern hybrid control

Received: 20 July 2016 Published: 01 March 2017

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TM46

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