| 摘要 |
<P>PROBLEM TO BE SOLVED: To eliminate the need for an additional apparatus so as to improve the reliability further to make the cost reducible, relating to the method and the apparatus for measuring a current using a single sensor, in two phases of the motor driven by a first/second pair of switches driving, respectively a first/second phase of the motor under control of a PWM signal. <P>SOLUTION: A first process 100 includes the process of reading a duty cycle of a drive current in each winding. In the next processes 104, 110, 114, 116, 118, the PWM signal is set, in a manner of tendering one or more timing windows like with at least one of the windings of the motor driven and with the other winding not being driven, and in a manner of tendering a relative timing offset of an almost half cycle between a pulse width modulation signal driving a first winding of the motor and a pulse width modulation signal driving a second winding. The next process 90 includes a process of gate controlling the switch, by using the preset PWM signal. The next process 95 includes the process of sampling a current of at least one winding by using the single sensor. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
