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:
May. 18, 2004
Filed:
Dec. 17, 2002
Shmuel Ben-Yaakov, Beer-Sheva, IL;
Green Power Technologies Ltd., Rehovot, IL;
Abstract
An Active Power Factor Correction (APFC) apparatus having improved output voltage regulation, for switching a power supply fed by an array of rectifying diodes and consisting of at least an input inductor, a contact of which is connected in series with a contact of the array, and of a controllable power switch connected in tandem with the array and the input inductor, that comprises a) sampling circuitry, for sampling the instantaneous value of the output voltage; b) control circuitry, for controlling the switching time of the controllable switch in response to an error signal, and, thereby, causing the instantaneous value to be essentially similar to a predetermined nominal value; c) amplifier circuitry, for generating the error signal, the amplifier circuitry having at least a reference input connected to a reference signal, being determined according to the nominal value and sampling circuitry, and an input, to which an input signal is provided, the error signal represents the deviation of the input signal from the reference signal, the input signal being associated with the sampled instantaneous value; and d) circuitry for providing a low-pass filtered first indication signal to the input, whenever the deviation, of the output signal, of the sampling circuitry, from the reference signal, does not exceed a predetermined value, or otherwise, for providing a second indication signal to the amplifier circuitry whenever the deviation exceeds the predetermined value, the second indication signal being related to higher deviation values.