The larger magnetising inductance of transformer is used to reduce the circulating current losses. Compared to conventional resonant converter, the hold-up time in the proposed converter is more than 40ms. Since the high voltage gain is used at low input voltage cased, the frequency variation of the proposed converter compared to the conventional resonant converter is reduced. To overcome these problems, the resonant converter with auxiliary secondary windings are presented in this paper to achieve high voltage gain at low input voltage case such as hold-up time duration when utility power is off. Thus, resonant converter is limited at narrow input voltage range and large input capacitor is normally adopted in commercial power units to provide the minimum hold-up time requirement when AC power is off.
The main problems of series resonant converters are wide frequency variation and high circulating current. Conventional series resonant converters have researched and applied for high-efficiency power units due to the benefit of its low switching losses.
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