US 12,334,774 B2
Uninterruptible power supply apparatus
Nobuyuki Momochi, Chuo-ku (JP)
Assigned to TMEIC CORPORATION, Tokyo (JP)
Appl. No. 18/577,551
Filed by TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION, Tokyo (JP)
PCT Filed May 31, 2022, PCT No. PCT/JP2022/022191
§ 371(c)(1), (2) Date Jan. 8, 2024,
PCT Pub. No. WO2023/233540, PCT Pub. Date Dec. 7, 2023.
Prior Publication US 2024/0339862 A1, Oct. 10, 2024
Int. Cl. H02J 9/06 (2006.01); H02M 1/34 (2007.01)
CPC H02J 9/062 (2013.01) [H02M 1/348 (2021.05)] 2 Claims
OG exemplary drawing
 
1. An uninterruptible power supply apparatus comprising:
a feed compensation circuit that is connected between a three-phase AC power supply and a three-phase AC load and supplies electric power to the three-phase AC load during power failure of the three-phase AC power supply; and
a bypass circuit that is provided between the three-phase AC power supply and the three-phase AC load, and in electrically parallel with the feed compensation circuit, wherein
the bypass circuit includes:
a first switch, a second switch, and a third switch that are connected respectively to a first phase, a second phase, and a third phase of the three-phase AC load; and
a first circuit, a second circuit, and a third circuit provided in electrically parallel with the first switch, the second switch, and the third switch, respectively,
the first circuit, the second circuit, and the third circuit each include:
a first snubber circuit;
a second snubber circuit provided between the first snubber circuit and the three-phase AC power supply; and
a power line between the first snubber circuit and the second snubber circuit, and
the power lines of the first circuit, the second circuit, and the third circuit are electrically connected to each other.