1
Francesco Carobolante: PWM control of motor driver. STMicroelectronics, Steve D Beyer, Theodore E Galanthay, Lisa K Jorgenson, February 9, 1999: US05869946 (66 worldwide citation)

Methods and apparatuses are provided for use in driving a multiple-phase brushless motor. The methods and apparatuses include generating a slewed phase control signal for each phase of the motor. The slewed phase control signals are substantially proportional to a speed control signal during non-tra ...


2
Francesco Carobolante, Ermanno Pace, Mark McCormack: Brushless direct current motor starting and operating apparatus and method. SGS Thomson Microelectronics, Ronald S Lombard, Richard K Robinson, May 21, 1991: US05017845 (65 worldwide citation)

A starting and operating apparatus and method for a sensorless, brushless direct current motor is disclosed. During start-up, the excitation to the motor is turned off while the slope of the differential back electromotive force of the floating phases is sampled. This indicates when the proper rotat ...


3
Francesco Carobolante, Scott W Cameron: Method and apparatus for operating polyphase DC motors using a PWM chopping signal in zero crossing determination. SGS Thomson Microelectronics, Richard A Bachand, Rodney M Anderson, Lisa K Jorgenson, May 14, 1996: US05517095 (51 worldwide citation)

A method and circuit for operating a polyphase dc motor having a plurality of driving coils is presented. In one of the available operating modes, drive current supplied to the driving coils is chopped, in PWM fashion to control the maximum current delivered thereto by turning the drive current on a ...


4
Francesco Carobolante, Mark E Rohrbaugh: Method and apparatus for operating polyphase dc motors. SGS Thomson Microelectronics, Richard A Bachand, Lisa K Jorgenson, Richard K Robinson, April 26, 1994: US05306988 (48 worldwide citation)

A circuit for operating a polyphase dc motor, for example of the type having a plurality of "Y" connected stator coils, has circuitry for unambiguously determining the actual instantaneous position of the rotor of the motor, circuitry for determining a desired rotor position precedent to executing a ...


5
Francesco Carobolante, Paolo Menegoli: Method and circuit for determining the velocity of a data detector mechanism of a mass storage device, or the like, using a BEMF voltage in the associated voice coil. STMicroelectronics, David V Carlson, Theodore E Galanthay, Lisa K Jorgenson, June 27, 2000: US06081112 (41 worldwide citation)

A circuit and method for measuring a back EMF voltage of a voice coil in a mass storage device, or the like, includes an amplifier connected across the coil to produce an output signal proportional to a voltage across the coil and a circuit connected to selectively connect the output signal of the a ...


6
Francesco Carobolante: Initialization circuit for automatically establishing an output to zero or desired reference potential. SGS Thomson Microelectronics, Richard A Bachand, Rodney M Anderson, Lisa K Jorgenson, December 27, 1994: US05376834 (33 worldwide citation)

A circuit for initializing the output voltage of an analog circuit includes a switch operative to connect an input of the analog circuit to a first reference potential during an initializing period. A comparator is connected to compare the output voltage of the analog circuit with a second reference ...


7
Francesco Carobolante, Ermanno Pace, Mark E Rohrbaugh: Automatic adjustment of commutation delay for brushless DC motor for improved efficiency. SGS Thomson Microelectronics, Richard A Bachand, Rodney M Anderson, Lisa K Jorgenson, June 27, 1995: US05428276 (31 worldwide citation)

A circuit and method are provided for automatically adjusting a commutation delay from events indicating a position of a polyphase dc motor. The circuit includes a driver to supply drive current to selected stator coils of said motor. A sequencer is connected to control the driver to apply drive cur ...


8
Francesco Carobolante: Circuit for providing a signal proportional to the average current flowing through coils of a motor operated in both linear and PWM modes. SGS Thomson Microelectronics, Richard A Bachand, Lisa K Jorgenson, Richard K Robinson, April 20, 1993: US05204594 (31 worldwide citation)

A circuit for providing a signal proportional to the average current supplied to the coils of a motor operated in both linear and PWM modes includes a sense resistor across which a voltage representing the current flowing supplied to said coils is developed. The voltage is selectively applied to an ...


9
Francesco Carobolante: Method and apparatus for providing the lock of a phase-locked loop system from frequency sweep. SGS Thomson Microelectronics, Richard A Bachand, Lisa K Jorgenson, Richard K Robinson, June 29, 1993: US05223772 (27 worldwide citation)

Synchronization of the output of an internally-driven VCO to an exterior clock signal is obtained by using the exterior clock signal to re-start the VCO at every exterior clock pulse, until the pre-set VCO frequency is reached. At that point, the restarting of the VCO ceases, and the VCO locks onto ...


10
Francesco Carobolante: Circuit for providing drive current to a motor using a sensefet current sensing device and a fast amplifier. SGS Thomson Microelectronics, Richard A Bachand, Joseph Arrambide, Lisa K Jorgenson, December 20, 1994: US05374857 (26 worldwide citation)

A circuit for providing drive current to a coil of a motor uses a sensefet current sensing device having a sense node and a source node. The source node is connected to deliver current to the coil, wherein a "sense" current proportional to said delivered current is produced on the sense node. An amp ...