Method and circuit for reducing power consumption of photoelectric isolating input collecting circuit

The invention discloses a method and circuit for reducing power consumption of a photoelectric isolating input collecting circuit. The method includes the steps of calculating a starting current, connecting a current limiting control circuit in series, detecting the size of an input current and limiting the input current to be the starting current. The circuit comprises the current limiting control circuit connected to the input end of the photoelectric isolating input collecting circuit in series. The value of the current limiting current of the current limiting control circuit is equal to that of the starting current of the photoelectric isolating input collecting circuit. The input current of the photoelectric isolating input collecting circuit is limited by the current limiting control circuit to be smaller than or equal to the starting current. By means of the method and the circuit, the photoelectric isolating input collecting power consumption can be effectively reduced by 35% to 70%, the design cost i