US 11,863,111 B2
Power supply control device and power supply control method
Shinnosuke Nakaguchi, Yokkaichi (JP); and Masayuki Kato, Yokkaichi (JP)
Assigned to AutoNetworks Technologies, Ltd., Yokkaichi (JP); Sumitomo Wiring Systems, Ltd., Yokkaichi (JP); and Sumitomo Electric Industries, Ltd., Osaka (JP)
Appl. No. 17/426,619
Filed by AutoNetworks Technologies, Ltd., Yokkaichi (JP); Sumitomo Wiring Systems, Ltd., Yokkaichi (JP); and Sumitomo Electric Industries, Ltd., Osaka (JP)
PCT Filed Jan. 14, 2020, PCT No. PCT/JP2020/000784
§ 371(c)(1), (2) Date Jul. 28, 2021,
PCT Pub. No. WO2020/158358, PCT Pub. Date Aug. 6, 2020.
Claims priority of application No. 2019-013440 (JP), filed on Jan. 29, 2019.
Prior Publication US 2022/0052631 A1, Feb. 17, 2022
Int. Cl. H02P 7/29 (2016.01); G05F 1/56 (2006.01); H02P 29/024 (2016.01)
CPC H02P 7/29 (2013.01) [G05F 1/56 (2013.01); H02P 29/027 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A power supply control device for controlling power supply to a motor installed in a vehicle, comprising:
a switching element configured to turn on and off the power supply to the motor;
a current detection circuit configured to detect a current flowing to the motor;
a table in which a plurality of currents having different magnitudes are respectively associated with duty cycles; and
a control unit configured to determine whether or not the motor is in a locked state based on the current detected by the current detection circuit, and control turning on and off the power supply to the motor at the duty cycle that corresponds to the current detected by the current detection circuit, if it is determined that the motor is in the locked state,
wherein the duty cycles in the table are set such that heat generated by the motor is suppressed while the power supply to the motor is turned on and off, and
the duty cycles in the table are set such that if, when each of the plurality of currents flows to the motor, the power supply is controlled with an on-period that is longer than an on-period indicated by the duty cycle associated with the corresponding current, a temperature of the motor increases.