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:
Oct. 24, 1995
Filed:
Jan. 31, 1994
Applicant:
Inventors:
Brooks R Leman, Santa Clara, CA (US);
Balu Balakrishnan, Saratoga, CA (US);
Assignee:
Power Integrations, Inc., Sunnyvale, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G05F / ;
U.S. Cl.
CPC ...
323222 ; 323209 ; 323303 ;
Abstract
An embodiment of the present invention is a boost preregulator circuit which includes a bridge rectifier, an inductor, a boost diode and an output capacitor. A power transistor is switched on and off across a junction of the boost inductor and boost rectifier according to a variable duty cycle. Proper variation of the duty cycle results in a power factor corrected AC line current waveform with an in-phase sinusoidal shape.