Patent attributes
A signal transmission circuit is connected to a positive electrode of a direct current power supply line, the signal transmission circuit includes a modulation circuit and/or a demodulation circuit, the modulation circuit includes a modulation chip, the modulation chip is used to receive an input signal, generate a modulation signal according to the input signal, and output the modulation signal through the positive electrode of the power supply line; the demodulation circuit includes a direct current isolation unit and a demodulation unit, the direct current isolation unit is connected to the demodulation unit and the positive electrode of the power supply line respectively, the direct current isolation unit is used to isolate a direct current signal of the positive electrode of the power supply line, and output the modulation signal; the demodulation unit is used to demodulate and output the modulation signal.
