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A DC power supply device comprises an AC/DC converter 1, a DC/DC converter 2, and a DC converter 3 converting DC power from a battery 4 to DC voltage for connecting to output terminals of the AC/DC converter. The DC power supply device is provided with a controlling circuit 100 which observes a char

A DC power supply device comprises an AC/DC converter 1, a DC/DC converter 2, and a DC converter 3 converting DC power from a battery 4 to DC voltage for connecting to output terminals of the AC/DC converter. The DC power supply device is provided with a controlling circuit 100 which observes a charging control level and a load sharing level, impresses a charging command on a UPS controlling part controlling the DC converter, and simultaneously provides a PFC controlling part controlling the AC/DC converter with a current command when a voltage level is less than the charging control level, stops only the charging command when the voltage level is more than the charging level and less than the load sharing level, and provides the UPS controlling part and the PFC controlling part with current commands when the voltage level is more than the load sharing level. The AC/DC converter and the DC converter supply power in parallel when a load is more than a prescribed value, and the DC converter supplies power as a backup when a trouble is present in an AC power input.

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A DC power supply device comprises an AC/DC converter 1, a DC/DC converter 2, and a DC converter 3 converting DC power from a battery 4 to DC voltage for connecting to output terminals of the AC/DC converter. The DC power supply device is provided with a controlling circuit 100 which observes a char

A DC power supply device comprises an AC/DC converter 1, a DC/DC converter 2, and a DC converter 3 converting DC power from a battery 4 to DC voltage for connecting to output terminals of the AC/DC converter. The DC power supply device is provided with a controlling circuit 100 which observes a charging control level and a load sharing level, impresses a charging command on a UPS controlling part controlling the DC converter, and simultaneously provides a PFC controlling part controlling the AC/DC converter with a current command when a voltage level is less than the charging control level, stops only the charging command when the voltage level is more than the charging level and less than the load sharing level, and provides the UPS controlling part and the PFC controlling part with current commands when the voltage level is more than the load sharing level. The AC/DC converter and the DC converter supply power in parallel when a load is more than a prescribed value, and the DC converter supplies power as a backup when a trouble is present in an AC power input. auxiliary inductance being respectively connected to the drain of said second power switch and the source of said first power switch through two diodes respectively, so that said diodes work with said power switches respectively to let the electric current of said auxiliary inductance be short-circuited by said respective power switch and diode to terminate the ringing upon the formation of the ringing. 7. The half-bridge forward ring-free zero-voltage-switching full-wave converter of claim 6 wherein said secondary windings each have one end connected to the negative pole of an output voltage filter capacitor and an opposite end respectively connected to the positive pole of two diodes, said diodes having the negative pole respectively connected to the positive pole of said output voltage filter capacitor through an inductance, so that said output voltage filter capacitor provides a stable DC output voltage to the load at the output end. 8. The half-bridge forward ring-free zero-voltage-switching full-wave converter of claim 7 wherein said power switches are power MOSFETs. 9. A half-bridge boost-forward ring-free zero-voltage-switching full-wave converter comprising: an input voltage filter capacitor, said input voltage filter capacitor having a positive pole and a negative pole respectively bridged to positive and negative poles of an input voltage, and a series circuit of a first power switch, a second power switch and a primary side capacitor connected in parallel to said input voltage filter capacitor, said primary side capacitor having the negative pole connected to the positive pole of said input voltage filter capacitor and the positive pole connected to the drain of said second power switch, said second power switch having the source connected to the drain of said first power switch, said first power switch having the source connected to the negative pole of said input voltage filter capacitor; and a transformer, said transformer comprising a primary winding and two secondary windings, said primary winding having one end connected to the negative pole of said primary side capacitor and an opposite end connected to the circuit between said first power switch and said second power switch through an auxiliary inductance, the circuit between said primary winding and said auxiliary inductance being respectively connected to the drain of said second power switch and the source of said first power switch through two diodes respectively, so that said diodes work with said power switches respectively to let the electric current of said auxiliary inductance be short-circuited by said respective power switch and diode to terminate the ringing upon the formation of the ringing. 10. The half-bridge boost-forward ring-free zero-voltage-switching full-wave converter of claim 9 wherein said secondary windings each have one end connected to the negative pole of an output voltage filter capacitor and an opposite end respectively connected to the positive pole of two diodes, said diodes having the negative pole respectively connected to the positive pole of said output voltage filter capacitor through an inductance, so that said output voltage filter capacitor provides a stable DC output voltage to the load at the output end. 11. The half-bridge boost-forward ring-free zero-voltage-switching full-wave converter of claim 10 wherein said power switches are power MOSFETs. 12. A half-bridge forward ring-free zero-voltage-switching half-wave converter comprising: an input voltage filter capacitor, said input voltage filter capacitor having a positive pole and a negative pole respectively bridged to positive and negative poles of an input voltage, and a series circuit of a first power switch and a second power switch connected in parallel to said input voltage filter capacitor, said second power switch having the source connected to the positive pole of said capacitor and the source connected to the drain of said first power switch