access icon free Efficiency optimisation of ZVS isolated bidirectional DAB converters

© The Institution of Engineering and Technology
Received 05/10/2017, Accepted 18/04/2018, Revised 15/04/2018, Published 20/04/2018

This study presents a control method for isolated bidirectional dual-active-bridge converters to optimise the efficiency by achieving the zero-voltage switching (ZVS) in high-voltage applications, which the switching losses are the major issues. At light-load condition, the duty control algorithm is proposed to achieve the ZVS for all switches while the triple phase shift with ZVS condition is realised at heavy load condition. The operating principles and the design considerations of the proposed control scheme are analysed in detail. A 2 kW prototype converter is built up and tested to verify the feasibility of the proposed control strategy.

Inspec keywords: DC-DC power convertors; zero voltage switching; switching convertors

Other keywords: efficiency optimisation; prototype converter; control method; control scheme; power 2.0 kW; switches; ZVS isolated bidirectional DAB converters; heavy load condition; ZVS condition; control strategy; dual-active-bridge converters; zero-voltage switching; light-load condition; triple phase shift; switching losses; duty control algorithm; high-voltage applications

Subjects: Power electronics, supply and supervisory circuits; DC-DC power convertors

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