Design, modelling, and implementation of a modified double‐switch flyback‐forward converter for low power applications

Abstract

This study proposes a modified double-switch flyback-forward (DSFF) converter for low-power applications with a reduced number of windings in its transformer. This circuit has resulted from the combination of the two-switch flyback and twoswitch forward converters. It includes a simple transformer with one set of secondary side windings, and it is not necessary to design two separate sets of windings for the desired output voltage which is the main problem of other flyback-forward converters. An auxiliary winding has been designed for self-biasing, and consequently, it improves the overall efficiency in the no-load condition. Due to the modifications on the previously presented two-switch flyback-forward converter, the circuit model has changed. This study, first, analyses the operation of the proposed converter in detail, then it explains a method to design this converter in continuous inductor current mode. Also, a start-up voltage regulator circuit and a modified bootstrap gate driver will be investigated, and the DC and AC model of the converter will be presented. Experimental results validate the proposed DSFF converter. The tested circuit includes a DSFF converter, a pulse generator circuit, a start-up voltage regulator, and a modified bootstrap gate driver.

Study of the energy parameters of the system “solar panels – solar inverter – electric network”

“…In addition to the function of increasing the voltage from solar panels, DC-DC converters also provide the function of extracting electricity from the solar battery to chemical energy storage devices, such as acid, alkaline or lithium-ion batteries, implemented by semiconductor converters. To implement the function of maximum power selection from the solar panel in the DC-DC converter, it is necessary to ensure the implementation of the input current value adjustment for maximum power selection from the solar panel [21,22].…”

An Interleaved Two Switch Soft-Switching Forward PWM Power Converter with Current Doubler Rectifier

“…Resetting the HF transformer is a special feature for the forward DC-DC converter. Therefore, several forward topologies have been suggested with diverse transformer reset arrangements [13][14][15][16][17].…”

A new high‐efficiency interleaved step‐up converter with zero‐voltage switching, zero‐current switching, and common‐ground features for stand‐alone electric vehicle charging stations

“…In addition, switching losses are imposed on the converter due to using hard-switching pulse width modulation (PWM) techniques. 12 New generations of boost converters, which are named as impedance source converters, operate with lower duty cycles. 13,14,16 Although the converter conduction losses decrease, still, the switching losses exist.…”

“…Consequently, this quiescent point diminishes efficiency via increasing the conduction losses. In addition, switching losses are imposed on the converter due to using hard‐switching pulse width modulation (PWM) techniques 12 . New generations of boost converters, which are named as impedance source converters, operate with lower duty cycles 13,14,16 .…”