Texas Instruments Corporation

Krushal Shah

Ganapathi Hegde

Mayank Garg

Prasad Kulkarni

Venkata Pavan Mahankali

Luis Eduardo Ossa

Sameer Pradeep Kulkarni

Vashist Bist

In some examples, an apparatus operable to drive a motor includes driver circuitry adapted to be coupled to the motor and processing logic coupled to the driver circuitry. The processing logic is operable to determine an expected current for controlling the motor, reduce a reference current upon which the motor is controlled from a first value to a second value at an exponential rate, determine that a measured current of the motor is approximately equal to the expected current, and responsive to determining that the measured current of the motor is approximately equal to the expected current, provide a control signal to the driver circuitry based on the expected current to the motor to control the motor to operate according to closed loop control.

Brushless motor control

Example systems and processes compare sampled values of a floating phase voltage and/or outgoing phase current of an electric motor with a corresponding reference to identify a degauss time period. Post degauss time period identification, sampled values are compared with a threshold to identify a settling time period following the degauss time period. The threshold used to identify the settling time period depends on a slope of a floating phase voltage after the degauss time period, a modulation scheme being used, and a pulse width modulation ON/OFF state of the electric motor. When the threshold comparison test is not met, it is determined whether the slope of the floating phase voltage has inverted. Based on such processing, a back-electromotive force (BEMF) zero-crossing (ZC) is detected or estimated with respect to a floating phase voltage of the electric motor.

Degauss time detection in electric motors

A synchronous serial bus peripheral circuit includes a peripheral identification (ID) register and a state machine circuit. The state machine circuit is coupled to the peripheral ID register, and is configured to transmit a status value based on a peripheral ID field of data received via the receiver shift register equaling a value stored in the peripheral ID register.

Synchronous serial interface allowing communication with multiple peripheral devices using a single chip select

A system includes a motor and a motor controller coupled to the motor. The motor controller includes a current sense circuit configured to: receive a first phase current sense measurement on a first measurement path; receive the first phase current sense measurement on a second measurement path; receive a second phase current measurement on the first measurement path; receive the second phase current on the second measurement path; average the first phase current sense measurement on the first measurement path with the first phase current sense measurement on the second path; and average the second phase current sense measurement on the first measurement path with the second phase current sense measurement on the second path.

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Dallas, TX, United States of America

Krushal Shah