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. 03, 1989
Filed:
Jan. 07, 1988
Applicant:
Inventor:
Dennis C Nolan, West Allis, WI (US);
Assignee:
MagneTek, Inc., Los Angeles, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06J / ;
U.S. Cl.
CPC ...
364602 ; 363 45 ; 36472408 ;
Abstract
A ripple rejection filter for removing the fundamental frequency of load voltage from control signals in closed-loop phase controlled systems operating from an AC power source. A low-pass filter is connected in parallel with a firing point synchronized sample and hold and high-pass filter series combination. The output of the low-pass and high-pass filters are combined to produce a resulting signal representative of an input signal but with ripple rejected.