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:
Jul. 03, 2001
Filed:
May. 25, 2000
Joan Wichard Strijker, Nijmegen, NL;
Robert Jan Fronen, Nijmegen, NL;
Antonius Maria Gerardus Mobers, Nijmegen, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A converter for the conversion of an input voltage between a first supply terminal and a second supply terminal into an output voltage, including a switching means which in operation are turned on and off alternatively under control of a control signal, an inductive element which together with the switching means forms a series arrangement coupled between the firs supply terminal and the second supply terminal, a control circuit for supplying the control signal, and evaluation means for evaluating a voltage across the switching means, which voltage exhibits ringing, and for supplying an evaluation signal to the control circuit. The frequency of the control signal is approximately constant and is determined by an oscillator. The control circuit turns on the switching means only when at the same time: the evaluation signal indicates that the voltage is smaller than the input voltage, and a further evaluation signal indicates that the derivative with respect to time of the voltage is smaller than or equal to zero, and the derivative with respect to time of the voltage equals a reference value.