Active-Clamping Single-Stage AC-DC Converter with the Input Current Shaper Charged in the Duty-Off Time

TL;DRAbstract

SummarySingle-stage a.c.-d.c. converters employing boost-type input current shapers (ICS) usually suffer from relatively high switch current stress and line current waveform distortion caused by the voltage-follower control. To remedy these drawbacks, this paper presents a novel single-stage soft-switching a.c.-d.c. converter. Unlike the conventional single-stage designs, the proposed ICS scheme is intentionally arranged to be charged in the duty-off time. With this design, the switch current stress in the duty-on time is greatly reduced. Moreover, this design produces a.c. modulation effect on the charging time of the ICS so that the waveforms of the average charging current and discharging current of the boost inductor can compensate each other automatically. Consequently, the input i-v curve has nearly linear relationship. In the proposed topology, an auxiliary transformer winding is employed to achieve the above functions. By programming the turns ratio between the auxiliary and se

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