Dual-power-supply compatible power supply circuit suitable for intelligent remote transmission electromagnetic water meter

The utility model provides a dual-power-supply compatible power supply circuit suitable for an intelligent remote electromagnetic water meter, which is characterized in that the positive electrode of a first direct current power supply end is connected with the in-phase input end of a voltage comparator, the positive electrode of a first diode is connected, and the negative electrode of the first diode is connected with the output end of a switch and the positive electrode of a power supply output end; the positive electrode of the second direct-current power supply end is connected with the inverted input end of the voltage comparator and the input end of the switch, the output end of the voltage comparator is connected with the control end of the switch, and the negative electrode of the first direct-current power supply end is connected with the negative electrode of the second direct-current power supply end and the negative electrode of the power output end. The utility model has the advantages that the