Method of controlling the duty of a PWM signal, PWM signal generating circuit, and image forming apparatus using same
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United States of America Patent
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Oct 6, 2009
Grant Date -
Dec 15, 2005
app pub date -
Jun 9, 2005
filing date -
Jun 14, 2004
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Abstract
A PWM signal generating circuit that generates a PWM signal having a period controlling portion for slightly fluctuating a period of the PWM signal; and a duty controlling portion for changing a duty of the PWM signal by changing a duty ratio in the period fluctuated by the period controlling portion.
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