Low-power-consumption card searching detection method based on radio frequency identification and near field communication

The invention discloses a low-power-consumption card searching detection method based on radio frequency identification and near field communication. In order to solve the problem of overhigh power consumption of the existing radio frequency card searching technology, the method comprises the following steps: inputting radio frequency identification and approach communication carriers into a preset detection circuit input end, and connecting an output end of the detection circuit with an input end of a comparator integrated or externally arranged inside an MCU (Microprogrammed Control Unit); the detection circuit comprises a core capacitor, a bleeder resistor and a plurality of coordination elements; after the core capacitor stores the voltage, the voltage is continuously released by the bleeder resistor for a time period T to a preset fixed voltage, and whether the to-be-detected card enters a detection range is determined according to the time period T and a preset time period threshold value. Under the con