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. 11, 1978
Filed:
Mar. 23, 1977
Applicant:
Inventors:
Masamichi Furukawa, Yokohama, JA;
Yoshio Serikawa, Tokyo, JA;
Assignee:
Ricoh Company, Ltd., , JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02M / ;
U.S. Cl.
CPC ...
363 21 ; 363 97 ; 331112 ;
Abstract
A DC-DC converter includes a blocking oscillator which is fed with a dc input from an input source and which oscillates to produce an output, which is rectified by a rectifier. The converter also includes an output voltage controlling transistor, the base of which is fed with the rectified output through a constant voltage element. The transistor controls a base current to an oscillating transistor which is contained in the blocking oscillator. The base current to this latter transistor is fed from the input source through a starting resistor and is also fed from the rectifier output through another resistor.