DMCA
A Tightly Regulated Triple Output Asymmetrical Half Bridge Flyback Converter
BibTeX
@MISC{Hyeon_atightly,
author = {Byeong-cheol Hyeon and Bo-hyung Cho},
title = {A Tightly Regulated Triple Output Asymmetrical Half Bridge Flyback Converter},
year = {}
}
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Abstract
In this paper, a tightly regulated triple output asymmetrical half bridge flyback (ASHF) converter is proposed. In order to regulate all output voltages, pulse frequency modulation (PFM), pulse width modulation (PWM) and phase delay (PD) are used simultaneously. In comparison with the conventional PWM-PD method, the interactions among the control variables are minimized and the operating range is increased. By the utilization of a multi winding transformer, the auxiliary transformer and the blocking capacitor are eliminated and the size and cost of the proposed converter is reduced. The operation principle of the converter is explained and the modes of operation are investigated. Based on the results, the steady state characteristics of the converter are explored. A 24V/10A, 12V/5A, 5V/10A hardware prototype is built and tested to verify the analysis results and the voltage regulation of the triple outputs of the proposed converter. Key Words: Asymmetrical half bridge flyback, PFM-PWM-PD method, Triple outputs I.
Keyphrases
conventional pwm-pd method triple output phase delay pulse width modulation pulse frequency modulation hardware prototype operating range blocking capacitor operation principle pfm-pwm-pd method key word auxiliary transformer control variable output voltage steady state characteristic analysis result voltage regulation asymmetrical half bridge flyback
