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:
Nov. 18, 1986
Filed:
Oct. 15, 1984
Applicant:
Inventor:
Wing K Eng, Stanhope, NJ (US);
Assignee:
AT&T Bell Laboratories, Murray Hill, NJ (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02M / ;
U.S. Cl.
CPC ...
363 21 ; 363 56 ; 363 97 ;
Abstract
A converter circuit that derives its bias power from voltage supplied by a tertiary winding including a tertiary winding voltage level responsive circuit with a hysteretic characteristic to selectively enable and disable the drive circuitry controlling the converter's power switching transistor. Should the bias voltage drop due to an output fault, the converter is operated at a subfrequency of its normal operating frequency in order to prevent operating the power switching transistor in its active region during high current conduction.