Protection circuit, method and device for compressor

The invention discloses a protection circuit, method and device for a compressor. The protection circuit comprises a voltage division circuit, a signal processing circuit and a power device, wherein a temperature control switch is arranged in the voltage division circuit which is used for outputting voltage signals according to actions of the temperature control switch, and the temperature control switch acts on the basis of the temperature of a cylinder of the compressor; the signal processing circuit is connected with the voltage division circuit and used for outputting control signals on the basis of comparison results of reference voltage signals, namely the voltage signals output by the voltage division circuit, and comparison voltage signals; and the power device is connected with the signal processing circuit and used for controlling work states of the compressor on the basis of the control signals. By means of the protection circuit, method and device for the compressor, the technical problem of low reliability of an existing compressor overheat protection scheme is solved.