Motorola Corporation

Temic Automotive of North America, Inc.

Ronan De Larminat

Guang Rong Liu

Alexander Kurnia

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 stepincludes reading a duty cycle of each winding drive current. A next step configuresthe 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 stepincludes gating the switches with the configured PWM signals. A next stepincludes sampling the current of the at least one of the windings with a single sensor.

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Northbrook, IL, United States of America

Ronan De Larminat