Single‐stage high‐power factor half‐bridge flyback converter with synchronous rectifier

Abstract

In this study, a single-stage half-bridge flyback converter using a synchronous rectifier (SR) is proposed to achieve unity power factor and higher efficiency. The proposed power factor correction can achieve almost a unity power factor and low input ripple current. The asymmetrical pulse-width modulation (APWM) half-bridge flyback converter operates under zero-voltage switching to reduce switching losses. The conduction loss of the system can be reduced by replacing the diode rectifier with an SR using a low on-resistance metal oxide semiconductor field effect transistor and the SR switch operates under zero-current switching. Detailed analysis is presented on the proposed converter. Experimental results for a 24 V/200 W converter at a constant switching frequency of 100 kHz were obtained to prove the analysis.

Isolated battery charger with multi‐level rectifier

“…The absolute input current is compared with the reference current and then sent to the current controller to accomplish the current inner loop. An extra feed-forward control is applied to eliminate the disturbance as shown in (6)- (8). The feed-forward signal is represented as…”

“…For considering leakage current suppression and human safety, electrical isolation between the utility and the battery set is expected. A high-frequency transformer can be integrated into the DC-DC converter such as a flyback converter, forward converter and bridge converter [7][8][9]. However, the input current of the AC-DC power conversion system is discontinuous, when the flyback converter or the forward converter is integrated, resulting in a large input filter and significant electromagnetic interference (EMI).…”

A Single-Stage Asymmetrical Half-Bridge Flyback Converter with Resonant Operation

“…The active-clamp fly-back converter [13] employs the active clamp network to achieve ZVS operation; however, the voltage stresses on the switches are greater than input voltage which will cause high conduction losses in the power switches. The asymmetrical half-bridge fly-back converter (AHBF) with resonant mode [14][15][16][17] was developed to achieve ZVS and reduce the voltage stresses on the switches to less than that of the active-clamp fly-back converter, so the power density and conversion efficiency can be effectively increased. Figure 1 shows the circuit configuration for the single-stage asymmetrical half-bridge fly-back converter with resonant mode.…”

Brushless DC motor drive with power factor regulation using Landsman converter

“…Whereas, in an approach of variable DC voltage control of VSI for controlling the speed of BLDCM, low-frequency switching signals can be implemented for electronic commutation of motor [26][27][28][29][30][31][32][33][34][35][36]. Based on this scheme, numerous configurations for PFC in BLDCM drive have been proposed in the recent literature [27][28][29][30][31][32][33][34][35][36][37].…”