Full-bridge PWM DC-DC Converter Research Articles

Fuzzy Controlled ZVS Asymmetrical PWM Full-bridge DC-DC Converter for Constant load High Power Applications

This paper proposes a fuzzy logic controlled new topology of high voltage gain zero voltage switching (ZVS) asymmetrical PWM full-bridge DC-DC boost converter for constant load and high power applications. The APWM full-bridge stage provides high voltage gain and soft-switching characteristics increase the efficiency and reduce the switching losses. Fuzzy logic controller (FLC) improves the performance and dynamic characteristics of the proposed converter. A comparison with a classical proportional-integral (PI) controller demonstrates the high performances of the proposed technique in terms of effective output voltage regulation under different operating conditions. Simulation is done by integrating two different simulation platforms <TEX>$PSIM^{(R)}$</TEX> and <TEX>$Matlab^{(R)}/Simulink^{(R)}$</TEX> by using SimCoupler tool of <TEX>$PSIM^{(R)}$</TEX>. Experimental results using 120W load have been provided to validate the results.

수중 음향센서용 전력증폭기를 위한 멀티레벨 가변전압출력 AC-DC 전원회로 설계

The paper proposes a new multilevel variable output voltage AC/DC Converter for power supply of power amplifiers used in underwater acoustic sensors. The proposed multilevel variable output voltage AC/DC Converter is composed of two parts. One as the input section is the high efficiency phase-shifted PWM full bridge DC-DC converter to get multiport power sources. The other as the output section is composed of two flying-capacitor 3-level DC-DC converters and a diode bridge circuit to get fast-response and multilevel variable output voltage for an envelope amplifier. Also the paper suggests the detailed circuit topology and design guideline of multilevel variable output voltage AC/DC converter. It also proposes the power balanced control method between 3-level converters and the voltage balanced algorithm for flying capacitors. Its characteristics should be verified by the detailed simulation results. It is anticipated that the proposed converter will be used very well for power amplifiers used in underwater acoustic sensors.

A Saturable Reactor Assisted Soft-Switching PWM DC-DC Converter.

In the demand for increasing power density of switched mode power converters, resonant topologies have attracted much attention because of their low switching losses and low EMI. However, they require relatively large resonant components, and high current or high voltage ratings for semiconductor devices.This paper presents a new soft-switching PWM full-bridge DC-DC converter which can overcome these drawbacks by utilizing a small saturable reactor. The principle of operation and steady-state characteristics are illustrated. The role of the saturable reactor is also discussed. Moreover, the voltage and current stresses for active and passive components are presented.To verify the results, key experiments were implemented with a 350W, 500kHz prototype converter. It is proved that the converter achieves soft-switching in a wide load range with no substantial increase in voltage and current stresses for active and passive components.