Zero-current-transition Converters for High-power-factor Ac/dc Applications
نویسندگان
چکیده
Zero-current-transition, discontinuousconduction-mode (ZCT-DCM) converters are introduced in this paper. Compared to hard-switching (PWM) converters in DCM, the ZCT-DCM converters have similar current stresses and conduction losses, and much reduced turn-off switching losses. At the expense of increased voltage stresses, zerocurrent/zero-voltage switching is maintained for a wide range of loads and voltage conversion ratios without the need for auxiliary active devices. In ac/dc applications, high power factor is obtained automatically, without the need for active control over the input current. An experimental 100kHz, 500W ZCTDCM Sepic rectifier with isolation transformer and single IGBT switch is described.
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