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. 22, 1994
Filed:
Jan. 03, 1992
Applicant:
Inventors:
Masayoshi Saito, Chiba, JP;
Takashi Birumachi, Yokohama, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02M / ; H02H / ;
U.S. Cl.
CPC ...
363 21 ; 363 57 ; 363 97 ; 361 93 ; 361111 ;
Abstract
A DC power supply apparatus includes a switching transformer having a switching element, a primary current detection circuit, arranged on a primary side of the transformer, for detecting a current flowing in the switching element, a secondary current detection circuit for detecting an output current from a secondary side of the transformer, and a control circuit for controlling the switching element on the basis of outputs from the primary and secondary current detection circuit.