Voltage signal isolation and conversion system

The invention discloses a voltage signal isolation and conversion system, which comprises a signal input stage chip internally provided with a modulation circuit; a signal isolation capacitor used forreceiving the first modulation signal output by the modulation circuit in the signal input stage chip and carrying out isolated capacitive coupling, wherein the second modulation signal subjected tocapacitive coupling is decoupled and restored to form a third modulation signal; a signal output stage chip internally provided with a demodulation circuit, wherein a third modulation signal passes through the demodulation circuit and then outputs signals such as PWM, an I2C protocol and voltage; and the power supply isolation transformer or the pair of power supply isolation capacitors is used for receiving a pair of complementary clock driving signals of the signal output stage chip, outputting an input power supply positive electrode signal and an input power supply negative electrode signal to the signal input stag