Hybrid-Bridge-Based DAB Converter with Wide Voltage Conversion Gain
This chapter proposes a voltage match (VM) control for hybrid-bridge-based dual active bridge (DAB) converter in wide voltage conversion gain applications. With the addition of an auxiliary half-bridge circuit, the topology becomes an integration of a half-bridge and a full-bridge DAB converter. Unlike other PWM generation method for DAB converters, this converter utilizes four-level voltage at one port of the transformer to obtain matched voltage waveforms within the range of twice the minimum conversion gain. Wide conversion gain, decoupling of the two power control variables, and wide zero-voltage switching (ZVS) ranges can be achieved with the proposed voltage match control. Full load ranges of ZVS for the six main power switches can be achieved, and the two auxiliary switches can also operate in a wide ZVS range. In addition, the power control is done only using two control variables and its implementation is very simple, only needing a divider and a conventional voltage regulator. These characteristics and benefits of the proposed control are verified by experimental results from a 1 kW converter prototype.
KeywordsHybrid bridge Dual active bridge Voltage match control Wide ZVS range Wide conversion gain
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