A novel integrated buck-flyback non isolated power factor (PF) correction (PFC) converter is proposed in this paper. This new converter is an inherent integration of a buck converter and a flyback converter, which operates in either flyback mode or buck mode according to whether the input voltage is lower or higher than the output voltage. In this way, the dead zones of ac input current in trad...

Zero-current (ZC) switching pulse-widthmodulated (PWM) flyback DC-DC converter is an extended version of the single switch flyback converter with an additional active circuit. The purpose of the active circuit is to turn-off the main switch with zero-current switching (ZCS) condition to reduce the turn-off switching loss. This paper presents an overview of the ZCS flyback PWM DCDC converters. T...

The flyback-flyback single stage converter operated in DCM+DCM is easy to control bus voltage, but it hard to control stress of switch. We propose a new converter having low voltage stress on its switch. The flyback converter is simplified into buck-boost form. Then the PFC flyback transformer is replaced by an inductor The switch of both PFC and DC/DC stages are merged, and a diode is used to ...

A novel soft-switching two-switch flyback converter is proposed in this paper. This converter is composed of two active power switches, a flyback transformer, a blocking diode, and two passive regenerative clamping circuits. The proposed converter has the advantages of a low cost circuit configuration, a simple control scheme, a high efficiency, and a wide operating range. The circuit topology,...

The experimental and theoretical results of a ZVS (Zero Voltage Switching) isolated flyback DC-DC converter using multilayered coreless PCB step down 2:1 transformer are presented. The performance characteristics of the transformer are shown which are useful for the parameters extraction. The measured energy efficiency of the transformer is found to be more than 94% with the sinusoidal input vo...

FORWARD CONVERTER Jhao-Cyuan Huang, Yong-seng Wong, Kuo-Bin Liu, NSRRC, Hsinchu, Taiwan Abstract The traditional pulse-width-modulated flyback converter power switch has serious electromagnetic interference (EMI) and lower conversion efficiencies problems due to the hard-switching operations. This paper produces a zero voltage switching of flyback-forward converter with an active-clamp circuit,...

The flyback converter type single-stage converter and a half wave rectifier with time-multiplexing control (TMC) for power factor correction is proposed. It has the advantage of better magnetic core utilization and better performance for high power applications. The major portion of the input is transferred to the load through ac-dc conversion. And the part of the input power is delivered to th...

The analysis and design of single phase inverter for photovoltaic (PV) applications based on interleaved flyback converter topology operating in discontinuous current mode with Extended switched Inductor Quasi Z-Source (ESL-QZS) network. In today’s PV inverter technology, the simple and the least-cost advantage of the flyback topology is promoted only at very low power. Therefore, the primary a...

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This paper presents the operational characteristics of a high voltage flyback converter with resonant elements. In high voltage low power applications, the effect of a transformer’s stray capacitance might be the most important factor that influences the overall performance of the circuit. A detailed mode analysis and the design procedure are presented in designing the high voltage flyback conv...