Texas Instruments Corporation

Tanchu Shih

Bertram John White

Juergen Luebbe

John Kevin Rote

Fredrick W Trafton

A system and method of motor control enable improved motor control by controlling a phase winding to float or enter a high impedance state prior to activating phase detection of the phase winding. Because the phase winding floats prior to phase detection, the effect residual current coupling in such phase can be mitigated and thereby help improve motor operation.

System and method for improved motor control

A configurable voltage regulator () operable in either of two selectable modes or topologies is disclosed. In one disclosed embodiment, the voltage regulator () can operate as a charge pump regulator or a switching regulator, to generate a negative polarity regulated voltage. The voltage regulator () includes an output driver (), for example including first and second drive transistors (A,B), that are used in both of the selectable modes.

Reconfigurable topology for switching and charge pump negative polarity regulators

The present invention includes a circuit to maintain a constant voltage on a storage element such as a capacitor at the output of a regulator during an emergency power condition. It includes a detector to detect the emergency condition and to generate a fault signal in response to the emergency condition, a one-shot time delay circuit to delay the enabling of a regulator in response to the fault signal, and a second delay unit to delay the enabling of the load of a regulator to accommodate the non-zero recovery time of a regulator. These two time delay units are able to bypass the noisy switching on the fault signal so that the maintained voltage on the storage capacitor will not droop and can be reliably used for such purposes as head retract and spindle brake under a noisy power emergency situation.

Growing community of inventors

Dallas, TX, United States of America

Tanchu Shih