| 摘要 |
<p>PURPOSE:To prevent large current from flowing in starting a motor and to prevent malfunction of equipment due to voltage drop by gradually charging a capacitor in a smoothing circuit at the rear stage of a switching transistor prior to the start of the motor. CONSTITUTION:When a system control circuit 4 is commanded to start a motor, a charging command signal becomes H-level and a transistor Q2 is turned ON for a specified period before a motor ON/OFF signal is raised. Then, prior to the start of a motor 2 the current limited by a resistance R1 is caused to flow to a capacitor C2 in a smoothing circuit 8, into which the current is charged. The ON state of a charging circuit 9 is cancelled when the motor ON/OFF signal is raised. Large current flow in starting the motor can thereby be suppressed.</p> |
