US 12,170,497 B2
Inverter control device and electric vehicle system
Toshiyuki Ajima, Tokyo (JP); Takafumi Hara, Tokyo (JP); Akihiro Ashida, Hitachinaka (JP); Hirokazu Matsui, Hitachinaka (JP); and Kiyoshi Kuroda, Hitachinaka (JP)
Assigned to Hitachi Astemo, Ltd., Ibaraki (JP)
Appl. No. 17/917,395
Filed by Hitachi Astemo, Ltd., Hitachinaka (JP)
PCT Filed Jan. 22, 2021, PCT No. PCT/JP2021/002144
§ 371(c)(1), (2) Date Oct. 6, 2022,
PCT Pub. No. WO2021/205709, PCT Pub. Date Oct. 14, 2021.
Claims priority of application No. 2020-069986 (JP), filed on Apr. 8, 2020.
Prior Publication US 2023/0155534 A1, May 18, 2023
Int. Cl. H02P 27/08 (2006.01); B60L 50/51 (2019.01); B60L 53/20 (2019.01); H02M 7/5395 (2006.01)
CPC H02P 27/08 (2013.01) [B60L 50/51 (2019.02); B60L 53/20 (2019.02); H02M 7/5395 (2013.01); B60L 2210/40 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An inverter control device, comprising:
a PWM control unit that generates a PWM pulse for controlling an inverter by using a modulation wave based on a voltage command, wherein the PWM control unit generates the PWM pulse by linearly approximating the modulation wave in a predetermined near-zero cross region including the zero cross point, and calculating a duty of the PWM pulse based on the modulation wave having been linearly approximated; and
a pulse edge control unit that corrects the PWM pulse such that a phase difference between a zero cross point where the modulation wave changes across 0 and a pulse edge of the PWM pulse falls within a predetermined range, wherein corrects the PWM pulse by determining a shift direction of the PWM pulse based on a slope of the modulation wave having been linearly approximated, and shifting the PWM pulse in the shift direction having been determined,
wherein when a phase difference between the zero cross point and a pulse edge of the PWM pulse after shift does not fall within the predetermined range, the pulse edge control unit sets a portion protruding from the predetermined range in the PWM pulse after shift as a pulse error, and arranges the pulse error separately from the PWM pulse after shift.