Be applied to railroad locomotive's continuation of journey formula back -up source

The utility model discloses a be applied to railroad locomotive's continuation of journey formula back -up source, its including: the DCDC module, the DCDC module is by locomotive input 100V direct current and export the 13.8V direct current, output port, output port's the input and the output of DCDC module are connected, constant voltage and constant current charging circuit, reserve lithium cell, the input and the output of DCDC module of constant voltage and constant current charging circuit are connected, and the output and the input of reserve lithium cell of constant voltage and constant current charging circuit are connected, and reserve lithium battery output end also is connected with output port's input, power management and detection circuitry, power management and detection circuitry are used for monitoring the current switch condition of DCDC module output, the CPU treater, the CPU treater is connected with the external device electricity. Through the structure design, the utility model has the