Patent ID: 6833691
Filing Date: 2004-12-21
Classification: G06F,H02M,H03K,H03M

Abstract:
In a switching power supply system having at least one switching element, a control circuit for driving said at least one switching element comprises:a dithering circuit configured to receive a control signal comprising a (m+n)-bit binary word, where m and n are positive integers, and to provide a modified control signal comprising a series of up to 2n m-bit binary words; a timing circuit configured to provide 2m timing signals and to communicate at least one of said timing signals to said dithering circuit; and a signal generator configured to receive said modified control signal and said timing signals and to provide a pulse width modulated signal to said at least one switching element, said pulse width modulated signal configured to activate said at least one switching element with an average duty cycle that is substantially equal to a quotient of a decimal equivalent of the (m+n)-bit binary word and 2(m+n).