Power feed state detection device, control device, and detection method

The invention discloses a power feed state detection device, which comprises an inductive coupling coil assembly, a signal filtering and amplifying circuit and a microcontroller, wherein the inductive coupling coil assembly is connected with the signal filtering and amplifying circuit, the signal filtering and amplifying circuit is connected with the microcontroller, the inductive coupling coil assembly is used for coupling and inducing an AC voltage signal, the signal filtering and amplifying circuit is used for filtering clutters in the AC voltage signal and amplifying the amplitude of the filtered AC voltage signal, and the microcontroller is used for converting the AC voltage signal processed by the signal filtering and amplifying circuit into a sine AC signal, recording a moment value of a zero crossing point of the sine AC signal, and converting the moment value into a phase angle value. According to the invention, the accuracy and reliability of feed state detection can be effectively improved, and the