Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1992-11-17
1994-07-19
Voeltz, Emanuel T.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 21, 363 34, H02M 3335
Patent
active
053315340
ABSTRACT:
A power supply apparatus has a full-wave rectifier for rectifying an AC voltage from an AC power source to output a DC pulsating voltage, and a high-frequency inverter which performs an oscillating operation to generate an output voltage. A first capacitor is connected between the output terminals of the full-wave rectifier, a diode is connected to one end of the first capacitor and is forward-biased with respect to the pulsating voltage from the full-wave rectifier, a second capacitor is connected in parallel with the first capacitor through the diode, and an oscillation circuit, including a series circuit formed of an inductor and a charging capacitor is connected in parallel with the second capacitor, for storing a DC voltage lower than a peak value of the pulsating voltage from the full-wave rectifier in the charging capacitor. The high-frequency inverter receives an input current supplied from the first and second capacitors when the pulsating voltage from the full-wave rectifier is higher than the charged voltage across the charging capacitor, receives an input current supplied from the oscillation circuit when the pulsating voltage from the full-wave rectifier is lower than the charged voltage across the charging capacitor, and performs an oscillating operation in the presence of the received input current.
REFERENCES:
patent: 4680687 (1987-07-01), Stasch et al.
patent: 4685041 (1987-08-01), Bowman et al.
Hiraoka Toshiyuki
Sugiyama Masahiro
Suzuki Shigesada
Berhane Adolf
Tokyo Electric Co. Ltd.
Voeltz Emanuel T.
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