US 12,334,294 B2
Power supply device
Yousuke Hayashi, Chuo-ku (JP); Xiaochen Zhang, Chuo-ku (JP); and Haruyoshi Mori, Chuo-ku (JP)
Assigned to TMEIC Corporation, Chuo-ku (JP)
Appl. No. 18/002,906
Filed by TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION, Chuo-ku (JP)
PCT Filed May 14, 2021, PCT No. PCT/JP2021/018383
§ 371(c)(1), (2) Date Dec. 22, 2022,
PCT Pub. No. WO2022/239225, PCT Pub. Date Nov. 17, 2022.
Prior Publication US 2023/0352253 A1, Nov. 2, 2023
Int. Cl. H01H 9/54 (2006.01); H02J 3/38 (2006.01); H02M 1/00 (2007.01); H02M 1/34 (2007.01)
CPC H01H 9/541 (2013.01) [H02J 3/381 (2013.01); H02M 1/0009 (2021.05); H02M 1/344 (2021.05)] 5 Claims
OG exemplary drawing
 
1. A power supply device comprising:
a first terminal that is connected to an AC power supply via a circuit breaker;
a second terminal that is connected to a load;
an AC switch that includes a semiconductor switch and a snubber circuit connected in parallel to each other between the first terminal and the second terminal;
a power converter that is connected between a power storage device and the second terminal to convert DC power from the power storage device into AC power and output the AC power to the second terminal;
a current detector that detects a current flowing through the AC switch;
a voltage detector that detects an AC voltage input to the first terminal; and
a controller that controls the AC switch and the power converter based on a detection value of the voltage detector,
when the AC power supply is normal, the controller turns on the semiconductor switch so as to supply AC power from the AC power supply to the load via the AC switch,
when an open state of the circuit breaker is detected,
the controller controls the power converter so as to supply a current having a phase opposite to that of the current detected by the current detector to flow through the semiconductor switch and supply the AC power to the load, and
the controller turns off the semiconductor switch in response to that an amplitude of the current detected by the current detector is 0.