| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a current sampling method if a half period of a PWM carrier signal is shorter than a current control period. <P>SOLUTION: A control section 10 in a motor driver comprises: a PWM carrier signal generator 1 for outputting the triangular PWM carrier signal; a timing generator 2 for outputting a current detection trigger signal and a current control trigger signal; a current detector 3 for detecting a motor current, and outputting a current detection value; a current controller 4 for comparing the current detection value with a preset current instruction, and outputting a voltage instruction; and a PWM controller 5 for comparing the PWM carrier signal with the voltage instruction, and outputting a PWM signal. The timing generator 2 generates the current detecting trigger signal and the current control trigger signal at a period of a multiple of (2n+1)/2 of a PWM carrier signal period. <P>COPYRIGHT: (C)2008,JPO&INPIT |
