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:
Mar. 08, 1988
Filed:
Jan. 16, 1987
Alan W Zimmerman, Hanover Park, IL (US);
Wells-Gardner Electronics Corporation, Chicago, IL (US);
Abstract
A regulated switching power supply is disclosed in which the high current set point, during regulation, is the peak (170a) of the regulated current instead of the peak (170) of the line frequency noise. The alternating current (14) is rectified (44, 46) and filtered (52, 54) and the output voltage is sensed and fed back (80) to an error amplifier (86) which provides an error signal that is repsponsive to the output voltage. The current levels is sensed (160) and a current sensing signal is provided to a first comparator (172) which is set to a first reference level prior to regulation. Once regulation occurs, the error amplifier (86) provides an error signal to a second comparator (180), which operates to change the reference level of the first comparator (172). In this manner, the error signal resulting when regulation occurs provides a reference level which enables the first comparator (172) to provide an output signal in response to a lower sensed current level than the sensed current level before regulation occurs.