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:
Mar. 01, 2005
Filed:
Mar. 19, 2003
Yasuhiro Nakata, Shizuoka, JP;
Yasuhiro Nakata, Shizuoka, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
There is provided a power supply apparatus that can raise the power supply efficiency while an appliance in which the power supply apparatus is installed is in a standby state, with a simple construction, without performing complicated control, and can reliably achieve improved power consumption due to the raise in the power supply efficiency, as well as noise reduction. According to the power supply unit, Conduction and interruption of a current flowing in the primary windingof the transformer Tis controlled. A voltage generated in the secondary windingof the transformer Tis rectified and smoothed by the rectifier and smoothing circuitAn output voltage of the rectifier and smoothing circuitis compared with a reference voltage and a voltage corresponding to a difference between the output voltage and the reference voltage is outputted by error detection circuitAn output from the error detection circuitis transferred from the secondary side to primary side of the optocoupler PCAn intermittent pulse signal is generated for forcibly reducing a signal level supplied to the optocoupler PCfor the period of the pulse being sufficient for stopping oscillation of the power supply apparatus irrespective of a result of the comparison of the error detection circuit