| 摘要 |
PURPOSE:To detect the locking of the drive of a CD motor or the flowing of overcurrents through the DC motor, and to stop a motor driver circuit when a person or an article is held during the normal operation of a sliding door and the drive of the DC motor is locked or when overcueernts are made to flow through the DC motor at an overload time when a certain constant load or more is applied to the sliding door. CONSTITUTION:A control logic circuit 3 controls a motor driver circuit 4 and a voltage changeover circuit 5 in response to the signals of an opening switch 1 and a position detecting switch 2, and the voltage changeover circuit 5 changes over voltage applied to a DC motor 6 into voltage at three stages and a lock stop detector 7 and an overcurrent detector 8 detect the state of lock stoppage or the state of overcurrents by the changes of voltage at both ends of a motor current detector resistor R1 connected in series with the DC motor 6. |
