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:
Jan. 12, 1988
Filed:
Nov. 14, 1986
Manfred Albach, Aachen, DE;
Fritz A Wegener, Aachen, DE;
U.S. Philips Corporation, New York, NY (US);
Abstract
A circuit arrangement for producing a direct voltage from a sinusoidal input voltage comprising a filter for suppressing interference voltages, a rectifier, a switched mode power supply part and a pulse generator. The pulse generator produces from the rectified input signal switching pulses for the switched mode power supply part. The frequency of these pulses is varied so that it is a minimum at the maximum value of the rectified input voltage and is a maximum at the minimum value and is varied between the extreme values so that the second derivative of the frequency with respect to time is always zero or negative. A switching pulse is terminated when a signal proportional to the output current of the rectifier exceeds the difference between a signal proportional to the rectified input voltage and an integrated signal proportional to the output current of the rectifier.