active-bridge (DAB) converter based power supply, a dc bias may occur in high-frequency
transformer and thus lead to the faults. In this paper, an improved transient extend-phase-
shift (TEPS) control strategy is proposed to suppress the dc bias without any additional
hardware. Unlike the traditional extend-phase-shift (EPS) strategy, the voltages of the
transformer are asymmetrical for half a period after changing phase-shift and then remain …