US 12,257,910 B2
Power conversion apparatus
Takeshi Ikuyama, Hitachinaka (JP); Koichi Yahata, Hitachinaka (JP); Shinichirou Hida, Hitachinaka (JP); and Yawara Kato, Hitachinaka (JP)
Assigned to HITACHI ASTEMO, LTD., Hitachinaka (JP)
Appl. No. 18/262,590
Filed by HITACHI ASTEMO, LTD., Hitachinaka (JP)
PCT Filed Sep. 30, 2021, PCT No. PCT/JP2021/036287
§ 371(c)(1), (2) Date Jul. 24, 2023,
PCT Pub. No. WO2022/163019, PCT Pub. Date Aug. 4, 2022.
Claims priority of application No. 2021-012638 (JP), filed on Jan. 29, 2021.
Prior Publication US 2024/0424916 A1, Dec. 26, 2024
Int. Cl. B60L 50/51 (2019.01); H02J 7/00 (2006.01)
CPC B60L 50/51 (2019.02) [H02J 7/00308 (2020.01); B60L 2210/42 (2013.01); H02J 2207/50 (2020.01)] 4 Claims
OG exemplary drawing
 
1. A power conversion apparatus for converting DC power supplied from a DC power supply into AC power, the power conversion apparatus comprising:
a plurality of switching devices constituting upper arms and lower arms of respective phases in a three-phase inverter circuit;
a plurality of drive circuits for driving the respective plurality of switching devices;
a power supply circuit for suppling a power supply to the plurality of drive circuits; and
a discharge circuit for discharging a capacitor connected in parallel to the three-phase inverter circuit, wherein
the power supply circuit includes a first transformer and a second transformer which include a primary winding connected in parallel to the DC power supply,
the first transformer includes a secondary winding for supplying a power supply to the drive circuits for driving the plurality of switching devices constituting the upper arms, and for supplying a power supply to a low-voltage circuit connected to a low-voltage power supply,
the second transformer includes a secondary winding for supplying a power supply to the drive circuits for driving the plurality of switching devices constituting the lower arms and for supplying a power supply to the low-voltage circuit,
each of the first transformer and the second transformer includes a feedback winding for outputting a feedback voltage corresponding to a voltage output to the drive circuits, to a power supply control IC, and
the discharge circuit is driven by a power supply supplied from the feedback winding in the first transformer and the feedback winding in the second transformer.