SYSTEM FREQUENCY SYNCHRONIZATION TRANSMISSION SYSTEM

PURPOSE:To perform synchronization transmission by a simple device by utilizing the frequency of the amount of electricity of a system for a clock signal in signal transmission which uses a power transmission and distribution line. CONSTITUTION:One of U, V, and W phases of a master station MSR, i.e. U phase is grounded through a resistance R and a switch SW, which is opened and closed by a modulator MS on the basis of a U-shape voltage as a reference phase as shown in a figure, where a signal STCLK is the opening/closing signal of the switch SW. A slave station SSR inputs the U-phase voltage Vu and a zero-phase voltage Vo to a demodulator DEM. The voltage Vo is an information signal corresponding to the opening/closing operation of the switch SW of the master station MSR, and the voltage Vu is a synchronizing signal, so that the synchronization transmission is carried out by simple devices.