Current Stress Optimal Control Strategy of Three-switch Push-Pull Bidirectional DC-DC Converter
To improve the operation efficiency of three-switch push-pull bidirectional full bridge converter(TPBFC),this paper proposes a peak current stress optimization control strategy.First the basic operation mode of TPBFC converter un-der extended phase shift control(EPS)is analyzed,and the expressions of system transmission power and peak current stress are derived.Furthermore the constraint model of transmission power and peak current stress of the converter is con-structed by using Lagrange function,and the phase shift ratio combinations enabling the minimum peak current stress un-der all the operation modes are derived.The adoption of the proposed strategy is found in an experiment on a self-built 500 W prototype to achieve a peak efficiency increase by 2%for the converter.
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