| 摘要 |
PURPOSE:To attain two-way communication without using a transformer by providing a diode bridge and an LPF to a remote controller side receiving a DC power from a cable and connecting a transceiver between them. CONSTITUTION:Power is applied to a power supply 1B of plural remote controllers RCTY from a DC power supply 1A of a main controller MCTX and two-way communication for a control signal is attained by superimposing an AC signal (f) on the control signal through the cable E. In this case, the MCTX side is provided with an inductance L1 blocking the signal (f) from the output of the power supply 1A and the transceiver 2A is connected between the cables E via a capacitor C1. At the RCTY side, a DC power is applied to the device 1B via a full wave rectifier diode bridge DB and an LPFL2 and the transceiver 2B is connected between the DB and the L2 via a capacitor C2. Since a DC current flows always to the DB, the operating point of the diodes is biased, the nonlinearity is neglected, the loss of the signal (f) is less and the cables are made nonpolar. |
