Analysis and Design of a Multioutput Converter Using Asymmetrical PWM Half-Bridge Flyback Converter Employing a Parallel-Series Transformer

Abstract

This paper presents a multioutput converter using an asymmetrical pulsewidth modulation half-bridge flyback topology employing a parallel-series-connected transformer. Compared to conventional multioutput topologies, the proposed converter operates using a single-output controller without the need for additional control loops and devices. In order to solve the cross-regulation problem, the output stages of the proposed converter are stacked in series. In addition, the voltage regulation of the proposed multioutput converter is improved through the analysis of its resonant characteristics under load variations and minimizing the secondary conduction loss. The proposed multioutput converter shows excellent performance in terms of its output regulation from no-load to full-load conditions and good cross regulation under high output currents. The design methodology and performance of the proposed converter have been verified through experimentation employing a 110-W (3.3 V/16 A, 5 V/12 A) prototype converter.