Dual Voltage Converter with Improved Power Factor and Enabling Voltage Control.
Tomomi Mashiko, Masahiko Kamatani, Noriaki Sato · IEEJ Transactions on Industry Applications · 1993
In this paper, a novel version of the dual voltage converter is presented with improved voltage regulation and enabling a wide range of voltage control by using self-turn-off devices (power transistors) instead of diodes.Further, this system operates with unity displacement factor.We have obtained the analytical expressions of this circuits.The results is, however, quite complex.We could calculate values of the voltage and current waveforms by using computer.The calculated values are essentially in agreement with experimental values.Experimentally, an ideal load characteristic with null voltage regulation was obtained by the conduction angle control for power transistors.Further, a wide range of voltage from 220 V to 39 V was obtained.A disadvantage for this system is the requirement for snubber circuits with a larger value of capacitor in order to suppress the surge voltages at turn-off periodes.キ