Patent ID: 11936237
Assignee: TOSHIBA MITSUBISHI—ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 2:
3. The uninterruptible power supply apparatus according to claim 2, wherein
each of the first and second AC power supplies includes a three-phase AC power supply start-connected to a neutral point,
both of neutral points of the first and second AC power supplies are grounded,
each of the first to third AC voltages includes three-phase AC voltage,
the first switch includes three first terminals receiving the three-phase AC voltage included in the second AC voltage, and three second terminals connected to the load,
the second switch includes three first terminals receiving the three-phase AC voltage included in the third AC voltage, and three second terminals connected to the load,
the first reference voltage is lower than a voltage twice a peak value of the first AC voltage, and
the second reference voltage is equal to or higher than the voltage twice the peak value of the first AC voltage.