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UNINTERRUPTIBLE POWER SUPPLY DEVICE AND UNINTERRUPTIBLE POWER SUPPLY SYSTEM USING THE SAME

  • US 20180076657A1
  • Filed: 04/01/2015
  • Published: 03/15/2018
  • Est. Priority Date: 04/01/2015
  • Status: Active Grant
First Claim
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1. An uninterruptible power supply device comprising:

  • a converter configured to convert an AC voltage supplied from an AC power supply into a first DC voltage, a second DC voltage, and a third DC voltage and output the first, second, and third DC voltages to a first DC bus, a second DC bus, and a third DC bas, respectively;

    an inverter configured to convert the first, second, and third DC voltages supplied through the first, second, and third DC buses into an AC voltage and supply the AC voltage to a load;

    a bidirectional chopper connected between the first, second, and third DC buses and a power storage device,the first DC voltage being higher than the second DC voltage, and the third DC voltage being an intermediate voltage between the first DC voltage and the second DC voltage,the bidirectional chopper includinga first transistor and a second transistor connected in series between the first DC bus and the third DC bus,a third transistor and a fourth transistor connected in series between the third DC bus and the second DC bus,a first diode, a second diode, a third diode, and a fourth diode connected in anti-parallel with the first transistor, the second transistor, the third transistor, and the fourth transistor, respectively, anda normal mode reactor including a first coil connected between a first node and a positive electrode of the power storage device, and a second coil connected between a negative electrode of the power storage device and a second node, the first node being located between the first transistor and the second transistor, the second node being located between the third transistor and the fourth transistor; and

    a controller configured to performa charging mode during a normal condition in which the AC power supply supplies an AC voltage, the controller in the charging mode causing the first transistor and the fourth transistor to be complementarily turned on to charge the power storage device, anda discharging node during an outage in which the AC power supply stops supply of AC power, the controller in the discharging mode causing the second transistor and the third transistor to be complementarily turned on to discharge the power storage device,the controller in the charging mode controlling an ON period of at least one of the first transistor and the fourth transistor to cause a value of current flowing through the first coil to be equal to a value of current flowing through the second coil.

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