Power supply device with improved efficiency and reduced higher harmonics
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United States of America Patent
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-
Feb 22, 2000
Grant Date -
N/A
app pub date -
Apr 2, 1998
filing date -
Apr 4, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a power supply circuit, a rectification circuit is coupled to a partial smoothing circuit, and an inverting circuit. The rectification circuit includes a rectifier coupled to a primary capacitor. The partial smoothing circuit includes a first, second, and third diode coupled together with the third diode in reverse polarity with the first and second diodes. The partial smoothing circuit also includes a series combination of a choke coil and a smoothing capacitor disposed in parallel with the second diode. A diode extends from the partial smoothing circuit to the inverting circuit. In one embodiment, the inverting circuit includes a main capacitor in parallel with a combination of a winding and an auxiliary capacitor. A switching means is coupled to the inverting circuit and the rectification circuit.
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