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:
Sep. 13, 2005
Filed:
Oct. 20, 2003
Mark Hirst, Boise, ID (US);
Mark Hirst, Boise, ID (US);
Hewlett-Packard Development Company, L.P., Houston, TX (US);
Abstract
In an embodiment of the invention, a circuit for controlling a fusing system such as used in a printer, copier or the like, comprises a timing circuit; an averaging circuit which receives an output from the timing circuit and averages the signal to produce a voltage signal; a modulation circuit arrangement which receives the voltage signal from the averaging circuit and generates a train of pulses which varies with the voltage signal from the averaging circuit; and a switch driver circuit which is responsive to the pulse train from the modulation circuit and which drives a power supply switching circuit with a timing to apply a smoothly changing alternating current to the fusing system. The modulation circuit may be of the pulse width modulation type or the frequency modulation type.