| 摘要 |
PURPOSE:To avoid the increase in leakage current, by connecting the absorber circuit when a current from AC power input is interrupted to an inductive load, and avoiding the connection in other cases. CONSTITUTION:When an operating switch 4 is closed and a DC voltage Vi is fed to a solid state relay 2, a transistor (Tr)8 is ON and a capacitor C is charged. On the other hand, a current flows to an inductive load L. In this case, since Tr9 is OFF, LED7 is not illuminated and an absorber circuit 5 is not connected. Next, when the switch 4 is OFF, the relay 2 is OFF and the current flowing to the load L is interrupted. Simultaneously, Tr8 is OFF and Tr9 is ON. Thus, the capacitor C is discharged and LED7 is illuminated. This illumination turns on the photo Tr6 and the circuit 5 is connected. Thus, the differentiating wave produced at OFF state is absorbed at the circuit 5. The illumination of LED7 is determined with the discharge time constant of CR and Tr6 is OFF after the stop of illumination. |
