| 摘要 |
PROBLEM TO BE SOLVED: To provide a control circuit for motor driving, which realizes a continuous operation. SOLUTION: A bias circuit 2' turns on/off voltage supply to a boosting circuit 3 in accordance with the on/off of a switch SW. The boosting circuit 3 boosts the voltage Vb of a battery 1, which is supplied through a bias circuit 2', to prescribed voltage Vup and supplies power to a control circuit. A voltage step down circuit 4 is connected between the output terminals of the boosting circuit 3, it bypasses the output terminals of the boosting circuit 3 when the switch SW is turned off and much discharge current is made to flow in the route of the boosting circut 3 → voltage step down circuit 4 → boosting circuit. Thus, the output voltage Vup of the boosting circuit 3 is dropped in a short time. |
