Power supply apparatus
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United States of America Patent
Stats
-
Jul 19, 1994
Grant Date -
N/A
app pub date -
Nov 17, 1992
filing date -
Nov 20, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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