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:
Jun. 04, 2002
Filed:
Mar. 23, 2001
Juan A. Sabate, Saratoga Springs, NY (US);
Gert W. Bruning, Sleepy Hollow, NY (US);
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A switching power supply is provided in two stages with the primary of the power transformer being in the first stage and the secondary in the second stage. The first stage includes an EMI filter connected to the input of a rectifier. The output of the rectifier is connected to a self oscillating, half-bridge, resonant inverter operating in open loop with the primary of the transformer to provide isolation from the power source. Feed-forward control is used to compensate for line variations, providing very small output voltage variation compared with input voltage variation. In the second stage, the secondary of the transformer provides an input to post regulator circuitry including a PWM control circuit to regulate the output current using the error signal representing the differences between the current sensed and the desired value.