Patent ID: 11901851
Assignee: MINEBEA MITSUMI IN.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 5:
6. The motor drive control device according to claim 3, wherein
the current zero crossing point estimation unit determines that the timing for switching the state of the ON period of the drive voltage matching the ON period of the signal for turning on or off the high side switch to the state of the ON period of the drive voltage not matching the ON period of the signal for turning on or off the high side switch is a zero crossing point of a polarity of the coil current switching from positive to negative, and determines that the timing for switching the state of the ON period of the drive voltage not matching the ON period of the signal for turning on or off the high side switch to the state of the ON period of the drive voltage matching the ON period of the signal for turning on or off the high side switch is a zero crossing point of the polarity of the coil current switching from negative to positive.