A method to operate a compressor protection circuit, comprising: a current sampling module, a reference voltage generating module, a voltage comparison module, and an intelligent power module, the current sampling module sampling a phase current of the compressor and outputting a corresponding sampling voltage signal to a first input end of the voltage comparison module, the reference voltage generating module outputting a reference voltage signal to a second input end of the voltage comparison module, the voltage comparison module comparing the sampling voltage signal with the reference voltage signal; the intelligent power module controlling a working condition of the compressor according to a driving signal outputted by a signal processing circuit, the compressor protection circuit further comprising a signal latching module; an output end of the voltage comparison module being connected with an input end of the signal latching module, an output end of the signal latching module being connected with a testing port of the intelligent power module for receiving an overcurrent level signal, a second input end of the signal latching module being connected with the signal processing circuit; when the sampling voltage signal being higher than the reference voltage signal, the voltage comparison module outputting an overcurrent level signal to the signal latching module, the signal latching module latching and outputting the overcurrent level signal to the intelligent power module continuously according to the overcurrent level signal, so that the intelligent power module shutting off the output of a phase current; when the intelligent power module shutting off the output of a phase power, the intelligent power module outputting a fault protecting signal simultaneously, so that the signal processing circuit stopping outputting the driving signal; when the signal processing circuit outputting a latching cancel signal to the signal latching module, the signal latching module outputting a conventional level signal to the intelligent power module according to the latching cancel signal, the intelligent power module driving the compressor to operate according to the conventional level signal and a driving signal outputted by the signal processing circuit. a current sampling module, a reference voltage generating module, a voltage comparison module, and an intelligent power module, the current sampling module sampling a phase current of the compressor and outputting a corresponding sampling voltage signal to a first input end of the voltage comparison module, the reference voltage generating module outputting a reference voltage signal to a second input end of the voltage comparison module, the voltage comparison module comparing the sampling voltage signal with the reference voltage signal; the intelligent power module controlling a working condition of the compressor according to a driving signal outputted by a signal processing circuit, the compressor protection circuit further comprising a signal latching module; an output end of the voltage comparison module being connected with an input end of the signal latching module, an output end of the signal latching module being connected with a testing port of the intelligent power module for receiving an overcurrent level signal, a second input end of the signal latching module being connected with the signal processing circuit; when the sampling voltage signal being higher than the reference voltage signal, the voltage comparison module outputting an overcurrent level signal to the signal latching module, the signal latching module latching and outputting the overcurrent level signal to the intelligent power module continuously according to the overcurrent level signal, so that the intelligent power module shutting off the output of a phase current; when the intelligent power module shutting off the output of a phase power, the intelligent power module outputting a fault protecting signal simultaneously, so that the signal processing circuit stopping outputting the driving signal; when the signal processing circuit outputting a latching cancel signal to the signal latching module, the signal latching module outputting a conventional level signal to the intelligent power module according to the latching cancel signal, the intelligent power module driving the compressor to operate according to the conventional level signal and a driving signal outputted by the signal processing circuit.