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US 7,741,927 B2Granted
PWM control circuit and motor equipped with the same
AssigneeSeiko Epson Corporation
InventorKesatoshi Takeuchi
Life of this patent
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Abstract
The PWM control circuit is provided. The PWM control circuit includes: a PWM control signal generator that generates a PWM period signal defining a period of a PWM signal and a PWM resolution signal specifying a resolution in one period of the PWM period signal; and a PWM unit that generates the PWM signal based on the PWM period signal and the PWM resolution signal, wherein the PWM control signal generator changes a frequency of the PWM resolution signal while keeping a frequency of the PWM period signal unchanged.
Claims9
A PWM control circuit, comprising:
- a PWM control signal generator that generates a PWM period signal defining a period of a PWM signal and a PWM resolution signal specifying a resolution in one period of the PWM period signal;
- and
- a PWM unit that generates the PWM signal based on the PWM period signal and the PWM resolution signal, wherein
- the PWM control signal generator changes a frequency of the PWM resolution signal while keeping a frequency of the PWM period signal unchanged.
1 more element
Dependencies are inferred from the claim text.