SYNCHRONOUS DATA TRANSMITTING METHOD

摘要

PURPOSE: To eliminate the influence of disturbance against the transmission of data and to eliminate the need for the auxiliary energy by transmitting simultaneously the electric energy to an operating measurement circuit and the data in the other direction respectively. CONSTITUTION: The power is supplied to a transmitting coil L1 from an AC power supply U1 of frequency f1. When an electronic switch S is closed, a filter capacitor Cs is charged via a diode D and a current IE is supplied to an electronic circuit. The electronic circuit has a flip-flop and converts the frequency f1 into a square wave signal Uf2 of frequency fl/2 which is led to a frequency f2h modulator. Then a phase jump occurs according to a low or high level of data to be transmitted to a logical output signal UMOD and the switch S is controlled. The load is sent to the primary supply voltage of a transformer and multiplied again by a synchronous signal UH of the same division coefficient of energy frequency for collection of data. Then these multiplied load and signal are led to a comparator after calculation of the mean value. Then a data signal is taken out of an output terminal of the comparator. Thus, the inverse transmission is attained for the measurement data obtained by a sensor.