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. 17, 1997
Filed:
Mar. 07, 1996
Masaaki Moriya, Zama, JP;
Canon Kabushiki Kaisha, , JP;
Abstract
A signal generating apparatus for generating a first pulse width modulation (PWM) signal and a second PWM signal synchronous with the first PWM signal, the first and second PWM signals controlling a switching power supply having a transformer with a plurality of secondary windings. The on-widths of the first and second PWM signals are adapted to be controlled independently, and the on-width of the second PWM signal is adapted to be increased or decreased without being affected by an increasing/decreasing state of the on-width of the first PWM signal. To this end, when the on-width of the second PWM signal is increased or decreased, the data used for increasing or decreasing the second PWM signal is corrected in accordance with the change state of the on-width of the first PWM signal.