| 摘要 |
PURPOSE:To obtain a signal current supplying device which is small in size and small in content rate of higher harmonic, by grounding through a switch the middle point of a series circuit of a diode and a capacitor provided between distribution lines, and providing the second circuit between the switch and the distribution line. CONSTITUTION:A series circuit of a diode D and a capacitor C is connected between a distribution line P2 and N, its middle point is grounded through a switch SW and an impedance Z1, an impedance Z2 is connected between the SW and the distribution line N, and the communication of a master station STM and a slave station STS is executed by turning on and off the SW and intermitting the current of a transmitter STM-S or STS-S. In such a case, Z1 and Z2 are set as an inductance L and a diode D', respectively, as in a slave station STS', by which an integral current by L is made to flow when the SW is on, and when the SW is off, the discharge current of the inductance L is made to flow through the diode D'. In such a way, a higher harmonic component in case the SW is on and off is reduced, approximated to a sine wave, and radio noise generated from a transmission line is reduced. |
