Loading patent…
AssigneesHitachi, Ltd., Hitachi Computer Peripherals Co., Ltd., Hitachi Tohbu Semiconductor, Ltd.
InventorsNorikazu Tokunaga, Kenichi Onda, Takeshi Onaka, Satoru Masuyama, Ryouhei Saga, Katsunori Hayashi
Estimating the term…
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.
A method of controlling a DC power supply device comprising an AC/DC converter which converts an AC input to DC voltage, a DC/DC converter which converts output power of said AC/DC converter into a load voltage, a DC converter converting DC power from a battery to DC voltage equivalent to the output of said AC/DC converter to connect to output terminals of the AC/DC converter, and a control circuit which controls the output voltage of said AC/DC converter and the output voltage of said DC converter to a prescribed value, said method comprising:
Dependencies are inferred from the claim text.