Laulanet
Francois Laulanet, Neder-Over-Heembeek BE
Patent application number | Description | Published |
---|---|---|
20100327788 | METHOD FOR STARTING A BRUSHLESS SENSORLESS DC MOTOR - A method for starting a brushless DC motor. A rotor is aligned with a stator in accordance with a predetermined phase. After alignment, the rotor is positioned in accordance with another phase, two phases are skipped, a timer is set to a first count time, and the rotor is aligned with the stator in accordance with a third phase. Then the timer is restarted and the rotor is aligned with the stator in accordance with a fourth phase. After a first delay, first back electromotive force value is stored. The timer is stopped when the first back electromotive force value substantially equals a peak amplitude of opposite polarity. The timer is updated to a second count time that is substantially equal to a time at which the second timer was stopped. The process is repeated until the rotor has a position and a velocity that are suitable for normal operation. | 12-30-2010 |
20140346956 | METHOD OF FORMING A SEMICONDUCTOR DEVICE AND STRUCTURE THEREFOR - In one embodiment, a method of forming an LED control circuit may include configuring the LED control circuit to receive a sense signal that is representative of a value of an LED current flow through a plurality of LED strings wherein each LED string includes a plurality of series coupled LEDs; configuring a detector circuit of the LED control circuit to detect the LED current being no greater than a first value and responsively initiate forming a first time period; and configuring the LED control circuit to inhibit forming the LED current responsively to termination of the first time period. | 11-27-2014 |
Francois Laulanet, Bruxelles BE
Patent application number | Description | Published |
---|---|---|
20080238410 | AUTO-CALIBRATION OF MAGNETIC SENSOR - The present invention provides a method to compensate for the sensitivity drift of a magnetic field sensor for sensing a magnetic field. The magnetic field sensor comprises at least four electrodes. The method comprises a first step where a first set of two electrodes is used to bias the sensor and a second set of two electrodes is used to sense an output signal of the magnetic field sensor, and a second step where the second set of two electrodes is used to bias the sensor and the first set of two electrodes is used to sense an output signal of the magnetic field sensor. The method is characterized in that at least one of the first or the second step is subdivided in at least a first sub-step and a second sub-step. A reference magnetic field has first magnetic field parameters, e.g. a first amplitude and/or direction, in the first sub-step and second magnetic field parameters, a second amplitude and/or direction, in the second sub-step. An output signal is sensed in the first and in the second step, and within the first or the second step an output signal is sensed in the first and the second sub-step. | 10-02-2008 |
20120133356 | AUTO-CALIBRATING A MAGNETIC FIELD SENSOR - In one embodiment a method to compensate for the sensitivity drift of a magnetic field sensor for sensing a magnetic field comprises forming a reference magnetic field having first magnetic field parameters, e.g. a first amplitude and/or direction, in a first step and second magnetic field parameters, a second amplitude and/or direction, in a second step and a bias signal is formed without adjusting the bias signal with a feedback signal derived from an output signal of the magnetic field sensor. | 05-31-2012 |
Francois Laulanet, Bruxelles (neder-Over Heembeek) BE
Patent application number | Description | Published |
---|---|---|
20080197794 | METHOD AND APPARATUS FOR DRIVING A DC MOTOR - A circuit for determining a direction of rotation of an electric motor, the motor having asymmetry and/or eccentricity in a profile of back electromotive force as a function of angular position of a rotor with respect to a stator, the circuit receiving a signal representing the BEMF, and use the corresponding asymmetry and/or eccentricity in the signal to derive the direction of rotation. The signal representing the back emf can be generated by a control circuit. The control circuit can have a feedback loop regulator to generate a control signal (TL or TR) to control a current drive circuit ( | 08-21-2008 |