BEMF crossing detection in PWM mode operation for sensorless mot

Details BEMF crossing detection in PWM mode operation for sensorless mot BEMF crossing detection in PWM mode operation for sensorless mot

1996-12-12

1998-08-04

Sircus, Brian

Electricity: motive power systems

Induction motor systems

Primary circuit control

318254, 318439, 318138, 3889281, H02P 528

Patent

active

057898952

ABSTRACT:
A method and a circuit for detecting zero crossing points for a brushless, sensorless, three-phase DC motor operated in a PWM mode. The circuit senses a BEMF signal in a floating coil and generates a first signal when the BEMF signal is separated from the center tap voltage by a selected offset voltage amount. The circuit overrides the PWM mode and drives a high side driving transistor to a conducting state until the zero crossing point is detected.

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