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This paper proposes a parallel output regulation method for isolated resonant DC transformer (DCX). With an auxiliary transformer in series with the main transformer at primary side and independent at secondary side, the DCX creates an additional output which feeds the cascaded PWM DC-DC converter. Because the output of the DC-DC converter is parallel with main output, the output voltage is regulated...
In this paper a two-stage high frequency AC-LED driver is designed and studied. The front-stage is a boost power-factor correction (PFC) circuit and the rear-stage is a halfbridge series resonant inverter. The lighting characteristics of high frequency AC voltage driving LEDs, and the effect of LED to half-bridge resonant circuit are discussed. The proposed design uses the digital dimming control...
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