Current sensing in a two-phase motor

Details Current sensing in a two-phase motor Current sensing in a two-phase motor

2005-12-29

2008-03-04

Nguyen, Ha Tran (Department: 2829)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S545000, C324S546000

Reexamination Certificate

active

07339394

ABSTRACT:
A method and apparatus for measuring current by a single sensor for two motor phases driven by first and second set of switches to drive respective first and second phases of a motor under control of PWM signals. A first step100includes reading a duty cycle of each winding drive current. A next step configures104, 110, 114, 116, 118the PWM signals to provide at least one timing window wherein at least of one of the windings of the motor is being driven while the other winding is not being driven, and to provide a relative timing offset of approximately one-half cycle between the pulse width modulation signals driving a first winding and a second winding of the motor. A next step90includes gating the switches with the configured PWM signals. A next step95includes sampling the current of the at least one of the windings with a single sensor.

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