| 摘要 |
PROBLEM TO BE SOLVED: To reduce circuit scale. SOLUTION: With a coil end of a motor 10 connected to a switch 30, the coil ends of the motor of phases that are not conducted are selected. The output of this switch 30 is supplied to a comparator 32 to be compared with the middle point voltage of the motor 10. A switch 32 selects and separates the comparison results of each phase one by one, and signals of the comparison result of each phase and signals from a logic circuit 40 are combined by switches 36a to 36c so that signals are outputted that are equivalent to the ones supposed to be obtained from the comparisons between the motor coil end of each phase and the middle point voltage by three comparators. |
