A single-stage asymmetrical half-bridge flyback converter with resonant operation
Journal
Energies
Journal Volume
11
Journal Issue
7
Date Issued
2018
Author(s)
Abstract
This paper proposes a single-stage asymmetrical half-bridge fly-back (AHBF) converter with resonant mode using dual-mode control. The presented converter has an integrated boost converter and asymmetrical half-bridge fly-back converter and operates in resonant mode. The boost-cell always operates in discontinuous conduction mode (DCM) to achieve high power factor. The presented converter operates simultaneously using a variable-frequency-controller (VFC) and pulse-width-modulation (PWM) controller. Unlike the conventional single-stage design, the intermediate bus voltage of this controller can be regulated depending on the main power switch duty ratio. The asymmetrical half-bridge fly-back converter utilizes a variable switching frequency controller to achieve the output voltage regulation. The asymmetrical half-bridge fly-back converter can achieve zero-voltage-switching (ZVS) operation and significantly reduce the switching losses. Detailed analysis and design of this single-stage asymmetrical half-bridge fly-back converter with resonant mode is described. A wide AC input voltage ranging from 90 to 264 Vrms and output 19 V/120Wprototype converter was built to verify the theoretical analysis and performance of the presented converter. © 2018 by the authors. Licensee MDPI, Basel, Switzerland.
Subjects
Fly-back converter; Single-stage; Variable-frequency-controller (VFC); Zero-voltage-switching (ZVS)
SDGs
Other Subjects
Controllers; Pulse width modulation; Voltage control; Voltage regulators; Zero voltage switching; Discontinuous conduction mode; Flyback converters; Intermediate bus voltages; Output voltage regulation; Pulse width modulation controllers; Single stage; Variable frequency controllers; Zero-voltage-switching operations; DC-DC converters
Type
journal article