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:
Sep. 21, 1982
Filed:
Feb. 18, 1981
Mitsuo Morihisa, Nara, JP;
Tadao Inoue, Kawachinagano, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A power supply circuit includes a rectifier for converting an alternating voltage to a DC voltage for driving a single chip LSI microcomputer control system in, for example, a microwave oven. A switching circuit is included in the power supply circuit for developing an output DC voltage only after the DC voltage derived from the rectifier reaches a preselected level. The switching circuit includes large current transistors connected in the Darlington fashion, whereby the power supply circuit develops the output DC voltage with a short leading transient period which is required for developing an auto-clear signal in the single chip LSI microcomputer control system.