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. 09, 1982
Filed:
Jul. 17, 1980
Hiroshi Fukui, Hitachi, JP;
Hisao Amano, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Metals, Ltd., Tokyo, JP;
Abstract
A d.c. power supply for use in microwave ovens in which an a.c. voltage having a commercial frequency is rectified and then is chopped at a high frequency by means of a switching element. The resultant voltage is smoothed before being applied to the microwave oven. The voltage level of the commercial frequency voltage is sensed to produce a control pulse the duty ratio of which becomes greater as the voltage level becomes lower. The control pulse is used to control the ON-OFF operation of the switching element. By this circuit configuration, the microwave oven is supplied with a continuously-controllable d.c. voltage having a flat waveform.