Switching power supply apparatus

Details Switching power supply apparatus Switching power supply apparatus

1994-06-02

1996-10-29

Wong, Peter S.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 53, H02M 3335

Patent

active

055702775

ABSTRACT:
A switching power supply apparatus rectifies an AC power input in a rectifier circuit, switches a rectified output and rectifies and smoothes the same in a switching circuit, and a desired DC voltage is derived. A current limiting circuit limits a current supplied to a smoothing capacitor of the rectifier circuit. A voltage detecting circuit detects a rectified output of the rectifier circuit. A current limiting control circuit controls the current limiting circuit in response to a detected voltage. The current limiting control circuit activates the current limiting circuit in a first preset period in which the detected voltage is equal to or lower than a preset level. Further, the current limiting control circuit activates the current limiting circuit for a second preset period after the detected voltage is first changed from a level equal to or higher than the preset level to a level lower than the preset level and then returned to the level equal to or higher than the preset level.

REFERENCES:
patent: 4387478 (1983-06-01), Koike
patent: 4731721 (1988-03-01), Igashira
patent: 4958268 (1990-09-01), Nagagata et al.
patent: 5101334 (1992-03-01), Plagge et al.
patent: 5175675 (1992-12-01), Uramoto
patent: 5412555 (1995-05-01), Uramoto

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