| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a PWM control system capable of full-logic formation, in which a PWM cycle can be fluctuated and a duty ratio can be set according to the operation state of a load. <P>SOLUTION: The PWM control system comprises a PWM fundamental wave generating means 12 which divides fundamental frequency signal to form PWM fundamental wave, a PWM cycle setting means 22 for setting PWM cycle based on the PWM fundamental wave, a duty ratio forming means 24 for forming a duty ratio (N/M:N≤M, M is maximum clock number) within the cycle of PWM, and a PWM control signal outputting means which outputs the PWM control signal having the duty ratio to the drive circuit of a load. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
