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:
Feb. 12, 1985
Filed:
Sep. 27, 1982
Kenichi Onda, Hitachi, JP;
Kojin Abe, Hitachi, JP;
Kohei Yabuno, Hitachi, JP;
Takeshi Uemura, Niigata, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In accordance with the present invention, there is provided a power supply apparatus comprising a primary winding of a main transformer and a semiconductor device with a control electrode connected in series between both electrodes of a DC power source, a drive current being fed to said control electrode of said semiconductor device via an auxiliary transformer, and output being obtained on a secondary winding of said main transformer by turning on and off of said semiconductor device, wherein a tertiary winding is provided on said main transformer and a negative polarity drive current is flowed into said semiconductor device via said tertiary winding when said semiconductor device is to turn off.