US 11,888,411 B2
Power conversion device
Akito Nakayama, Tokyo (JP); Taichiro Tsuchiya, Tokyo (JP); and Jumpei Isozaki, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP); and TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION, Tokyo (JP)
Appl. No. 17/606,047
Filed by Mitsubishi Electric Corporation, Tokyo (JP); and Toshiba Mitsubishi-Electric Industrial Systems Corporation, Tokyo (JP)
PCT Filed Jul. 1, 2019, PCT No. PCT/JP2019/026111
§ 371(c)(1), (2) Date Oct. 25, 2021,
PCT Pub. No. WO2021/001888, PCT Pub. Date Jan. 7, 2021.
Prior Publication US 2022/0239231 A1, Jul. 28, 2022
Int. Cl. H02M 3/335 (2006.01); H02M 7/483 (2007.01); H02M 1/08 (2006.01); H02M 1/32 (2007.01)
CPC H02M 7/4835 (2021.05) [H02M 1/08 (2013.01); H02M 1/32 (2013.01); H02M 3/33523 (2013.01); H02M 7/483 (2013.01); H02M 7/4833 (2021.05)] 20 Claims
OG exemplary drawing
 
1. A power conversion device comprising:
a main circuit including a main circuit switching element and a main circuit power storage element;
main circuit control circuitry to control the main circuit; and
a main circuit power supply device to supply a control power source from the main circuit power storage element to the main circuit control circuitry, wherein
the main circuit power supply device includes
a plurality of voltage-division power storage elements connected in series,
a voltage adjustment circuit which is connected to the plurality of voltage-division power storage elements and adjusts each of voltages of the plurality of voltage-division power storage elements through mutual transfer of power between the plurality of voltage-division power storage elements, and
at least one DC/DC converter which is connected to at least one of the plurality of voltage-division power storage elements and supplies the control power source.