The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 29, 1996
Filed:
Jun. 02, 1994
Akihiko Ito, Kawasaki, JP;
Yukio Gotoh, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
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.