Single-source large capacity multi-function field emergency power supply device

A single power supply device with high capacity and multifunction for emergency in the field comprises a direct current battery ( 1 ),an output stitching group ( 6 ). The utility model is characterized in that the power supply device also comprises a bidirectional charging management circuit ( 3 ), a boost-constant voltage control circuit ( 4 ) and a power supply control circuit ( 5 ) for external equipments, all of which are connected with the direct current battery ( 1 ) in turn, wherein the output stitching group ( 6 ) comprises a first fixed fold output switch ( 61 ), a second fixed fold output switch ( 62 ), a third fixed fold output switch ( 63 ) and a variable load output switch ( 64 ). The utility model can meet diverse requires for power supplying and charging without many different batteries, and has the advantages of long power-on time, variety of external equipments which are controlled respectively, and convenient employment.