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:
Apr. 03, 2012
Filed:
Aug. 06, 2009
Takahiko Yamamuro, Tokyo, JP;
Akihiro Nagase, Tokyo, JP;
Kouji Okazaki, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
In a constant current switching power supply, the current flowing through the load, is feedback-controlled based on the deviation of the detection value (Id) from the target value (Ir), multiplied by a proportional gain (PG), the value of the gain is set to a predetermined value immediately after the load switching element () is turned on, and is thereafter gradually reduced with elapse of time. When the current to the load () is supplied by a PWM controlled switching circuit (), the PWM signal is determined based on a product of the deviation and a proportional gain. It is possible to shorten the rise time of a pulsative load current in a situation where the current is relatively large.