| 摘要 |
PURPOSE:To ensure a transmission of data with a simple constitution, by charging at the transmission part with one polarity of the AC voltage and discharging in the prescribed phase of the AC voltage when the data exist to transmit the discharged pulse and then extracting the discharged pulse at the reception side, respectively. CONSTITUTION:The capacitor 22 of the transmission part 20 is charged by the diode 21 only at the time of one polarity of the power supply voltage. The control part 25 detects the prescribed phase of the AC voltage, and then the data is given to light the light emitting element 242 at the time of the prescribed phase of the power supply voltage to give a conduction to the thyristor 241. Thus the charging voltage charged by the capacitor 22 is discharged quickly via the resistance 23 and the thyristor 241. This discharged pulse is accmulated to the AC voltage to be transmitted to the reception part 40. The gate signal generating circuit of the part 40 detects the same phase as the prescribed one that is detected at the part 20 and then gives it to the AND circuit 50 as the gate signal. Thus the data is obtained at the output of the circuit 50 from the part 20. |
