| 摘要 |
PURPOSE:To effectively fire a solid state relay of a switching circuit by inserting an obtuse waveform forming circuit between a sole control unit for supplying a current to the primary side conductor and switching means. CONSTITUTION:A switching circuit 11 made of a solid state relay having a zero-crossing function is inserted between a plurality of the primary side conductors 1 provided at suitable interval along a conveying passage and a sole control unit 10 to be turned ON and OFF by a signal from a sensor 4. Further, an obtuse waveform forming circuit 14 made of a series connection circuit of a capacitor 12 and a resistor 13 is inserted between the unit 10 and the circuit 11. Thus, since the output waveform from the unit 10 becomes obtuse, the time width near zero-crossing point is widened to effectively fire the relay of the circuit 11. |
