Abstract
A 1-phase high frequency transformer isolated, soft-switching, single-stage AC-to-DC converter with low line-current distortion is presented. The circuit configuration is obtained by integrating two DCM boost converters with a DCM full-bridge buck converter. The ZVS for the top switches is achieved automatically, whereas, bottom switches are aided by zero-voltage transition circuits. The output voltage is regulated by duty cycle control at constant switching frequency. The steady state analysis is presented. A 1 kW converter design example is given. PSPICE simulation and experimental results obtained from a 1 kW laboratory prototype are presented.
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