| 摘要 |
PURPOSE:To open and close the cable way at high speed by connecting a semiconductor switch element between the commonly connected cathode side and the commonly connected anode side of the diode bridge circuit interposed in the cable way where the current flows bidirectionally. CONSTITUTION:The connecting point 3 between the anode of diode D1 and the cathode of diode D2 is connected to the output side of an inverter and the connecting point 4 between the anode of diode D3 and the cathode of diode D4 is to the load motor. When the power transistor TR1 is switched on, the current flows through the following course: inverter D1 TR1 D4 motor. Conversely, the current flows through the following course: motor D3 TR1 D2 inverter. Thus, when in either direction the current flows between the inverter and the motor, the current flows through between the collector and the emitter of the power transistor TR1. If the power transistor TR1 is therefore controlled by switching it off, then the current is shut off at high speed.
|
