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. 17, 1981
Filed:
Jun. 16, 1980
Applicant:
Inventor:
Girish C Johari, Round Rock, TX (US);
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02M / ;
U.S. Cl.
CPC ...
363 21 ; 363 37 ; 363 80 ; 363 97 ;
Abstract
A constant loop gain is achieved in a flyback type DC to DC converter by use of feedback to correct for load variations and feed forward to correct for line voltage variations. The feedback signal and a reference voltage are compared by an error amplifier. An output of the error amplifier is multiplied by a constant and is added to a signal proportional to line voltage. The resulting sum causes modification of the slope of a ramp voltage which is compared to the voltage at the output of the error amplifier to control the 'on' times of the converter switching devices.