| 摘要 |
PURPOSE:To drive to switch without necessity of a base drive power source by providing first switching means between a driving coil and first, second power supply lines, second switching means between the coil and a ground, and a driving circuit for outputting a control signal. CONSTITUTION:A higher voltage than a first power supply line 5 is applied from a power source to a second power supply line 6. Switching elements 81a, 81b, 81c provided between the line 5 and motor driving coils 1, 2, 3, and first switching control means 82a, 82b, 82c and second switching control means 83a, 83b, 83c are provided for gates of the elements. Here, third switching control means 84a, 84b, 84c are provided, and the means 82a, 82b, 82c and the means 83a, 83b, 83c are alternately operated based on a switching control signal output of a driving circuit. |
