| 摘要 |
<P>PROBLEM TO BE SOLVED: To realize a motor drive circuit of a current specified type with a configuration of relatively small circuit scale, having both maximum current value of a current value occurred in a motor driver and stability. <P>SOLUTION: A current control unit comprises a hardware function capable of changing a PWM cycle and a PWM tracking amount of a PWM driving signal during operation and adjusts a PWM driving signal to be given to a motor drive circuit by changing the PWM cycle and PWM tracking amount using a firmware. A current value supplied to a paper feeding motor is measured and compared with a target current value, and the PWM driving signal is adjusted from the comparison result. <P>COPYRIGHT: (C)2013,JPO&INPIT |
