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Dual voltage converter with improved power factor and enabling voltage control
Author(s) -
Mashiko Tomomi,
Kamatani Masahiko,
Sato Noriaki
Publication year - 1993
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.4391130311
Subject(s) - dropout voltage , power factor , voltage , voltage regulator , voltage regulation , electrical engineering , voltage converter , snubber , constant power circuit , voltage divider , voltage optimisation , capacitor , engineering
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 circuit. The results are, however, quite complex. We could calculate values of the voltage and current waveforms by using a computer. The calculated values are essentially in agreement with the 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 periods.