Switching power device

Details Switching power device Switching power device

2006-10-10

2006-10-10

Phan, Tho (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C330S010000, C330S251000, C363S018000, C363S019000

Reexamination Certificate

active

07119499

ABSTRACT:
A switching power device uses a non-capacitor flyback converter circuit not provided with a smoothing input capacitor having a large capacity. Therefore, a power harmonic can be suppressed and a rush current preventing element is not required. A fluctuation in an output current to be supplied to a load is fed back to the non-capacitor flyback converter circuit by a feedback circuit at a lower speed than an input AC frequency. Therefore, it is possible to improve a power factor by causing an input AC current to be proportional to an input AC voltage. A voltage control circuit controls an output voltage so as to have a constant voltage, and the output voltage is dropped in proportion to an output current when the output current exceeds a threshold. Therefore, it is possible to have the same output characteristic as a power device comprising a low frequency power transformer.

REFERENCES:
patent: 6388514 (2002-05-01), King et al.
patent: 6690586 (2004-02-01), Hosotani et al.
patent: 2003/0011324 (2003-01-01), Lee
patent: 5176532 (1993-07-01), None
patent: 7274388 (1995-10-01), None

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