FSK (Frequency Shift Keying) signal control circuit for realizing on and off control of photovoltaic turn-off device

The utility model provides an FSK (Frequency Shift Keying) signal control circuit for realizing switching-on and switching-off control of a photovoltaic turn-off device. The FSK signal control circuit comprises a photovoltaic turn-off device which is composed of an inductor L0, capacitors C40-C45 and capacitors C50-C55 and meets SunSpec standard requirements; the LC series-parallel resonance frequency selection circuit is composed of a capacitor C11, a capacitor C14, an inductor L5, an inductor L6 and a resistor R12, meets the SunSpec standard requirement, has sensitivity and anti-interference performance and comprises a series resonance sub-circuit and a parallel resonance sub-circuit which are connected in series; the series harmonic oscillator circuit is formed by connecting a capacitor C11 and an inductor L5 in series, and the resonant frequency of the series harmonic oscillator circuit is within a preset interval set by two FSK signal frequencies; the parallel harmonic oscillator circuit is formed by con