Hyun-Lark Do

A Soft-Switching DC/DC Converter With High Voltage Gain

A soft-switching dc/dc converter with high voltage gain is proposed in this paper. It provides a continuous input current and high voltage gain. Moreover, soft-switching characteristic of the proposed converter reduces switching loss of active power switches and raises the conversion efficiency. The reverse-recovery problem of output rectifiers is also alleviated by controlling the current changing rates of diodes with the use of the leakage inductance of a coupled inductor. Experimental results obtained on 200 W prototype are discussed.

Soft-Switching Two-Switch Resonant AC–DC Converter With High Power Factor

A soft-switching two-switch resonant power factor correction (PFC) converter is presented. In this converter, a boost PFC circuit is integrated with a soft-switching resonant converter. High power factor is achieved by the boost PFC circuit. The voltage across the main switches is confined to the dc-link voltage and the energy of the transformer leakage inductance is also recycled. Soft-switching operation of main switches and output diodes is achieved with a resonant manner and the switching losses are significantly reduced. Therefore, the overall efficiency is improved. The presented theoretical analysis is verified by a prototype of a 48 V, 60 W converter.

Energy-Recovery Sustain Driver With Low Circulating Current

An energy-recovery sustain driver with low circulating current for a plasma display panel (PDP) is proposed. The energy stored in the external resonant inductors during the reverse-recovery periods of the diodes in the sustain driver is transferred to the input voltage source and the energy-recovery capacitors. The proposed sustain driver can reduce the circulating current and relieve the thermal problems of the main sustain switches. Experimental results obtained on a 42-in high-definition PDP with a resolution of 1024 × 768 are discussed.

An efficient driving method for a high-voltage CMOS driver IC

An efficient driving method for a high-voltage CMOS driver integrated circuit (IC) is proposed. It utilises an auxiliary circuit to reduce the voltage across the data driver IC when its output stages change their status. The auxiliary circuit can reduce the power consumption and relieve the thermal problems of the driver ICs. Moreover, it has load adaptive characteristics. Power consumption was reduced by 46% at one dot on/off image pattern.