The utility model discloses a five two -way level DC converting circuit and contain generator excited system of this circuit. The utility model discloses an among the five level chopper circuit, one end first, three, five switch tubes are connected in excitation output one end, and the DC power supply anode is connected respectively to the other end, connect electric capacity series -wound loop mid point, DC power supply negative terminal behind the 7th diode of establishing ties, the one end of second, four, six switch tubes is connected in the excitation output other end, and the DC power supply anode is connected respectively to the other end, connect electric capacity series -wound loop mid point, DC power supply negative terminal behind the 8th diode of establishing ties, first to the6th diode respectively the inverse parallel in first to the 6th switch tube. The utility model discloses when accomplishing the output of five level direct current chopping excitation voltage, excitation power bi -directional flow and move, can realize excitation current's bidirectional output, realize five level DC converting circuit's four -quadrant operational check.