US 11,942,890 B2
Semiconductor device, motor drive system, and method of starting motor
Satoshi Narumi, Tokyo (JP); Minoru Kurosawa, Tokyo (JP); and Takeshi Ohtsuki, Tokyo (JP)
Assigned to RENESAS ELECTRONICS CORPORATION, Tokyo (JP)
Filed by RENESAS ELECTRONICS CORPORATION, Tokyo (JP)
Filed on Sep. 20, 2021, as Appl. No. 17/479,185.
Claims priority of application No. 2020-165185 (JP), filed on Sep. 30, 2020.
Prior Publication US 2022/0103100 A1, Mar. 31, 2022
Int. Cl. H02P 6/182 (2016.01); H02P 6/20 (2016.01)
CPC H02P 6/182 (2013.01) [H02P 6/20 (2013.01); H02P 2203/03 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A semiconductor device for controlling a three-phase motor, the semiconductor device comprising:
a detection circuit coupled to output nodes corresponding to each phase of the three-phase motor, and configured to detect a voltage generated in the output node of a non-energized phase of the three-phase motor; and
a controller configured to:
at a time of starting the three-phase motor, apply a drive voltage to any two phases of the three-phase motor based on an estimated magnetic pole position of a rotor in a stop state; and
estimate a position of the rotor based on a difference voltage between i) a voltage generated in the output node of the non-energized phase during a drive voltage applying period and ii) a voltage generated in the output node of the non-energized phase during a regeneration period immediately after or immediately before the drive voltage applying period,
wherein, when an absolute value of the difference voltage is less than or equal to a first threshold, the controller switches the phase the drive voltage applying.