| Patent application number | Description | Published |
|---|
| 20080238487 | Duty cycle comparator - A duty cycle comparator is described for comparing the duty cycles of two digital signals. The duty cycle comparator comprises a first controllable current source, a second controllable current source and a charge accumulation device. The comparator provides an output signal that is representative of the difference between the duty cycles independent of the frequency of the two digital signals. | 10-02-2008 |
| 20080240688 | Fan controller with duty cycle comparator - A control circuit for a direct current motor is described. In accordance with the principles of the invention, a duty cycle comparator is provided to control the speed of the motor. | 10-02-2008 |
| 20080265811 | DC motor variable kick-start - A method of operating a direct current motor fan assembly is provided in which a motor controller operates to apply full power to kick-start a motor to overcome static forces. As soon as a sensor determines that the motor has begun to rotate, the motor controller changes the motor drive level from full power to a predetermined lower level to maintain a desired rotational speed. | 10-30-2008 |
| 20080273865 | Noise suppresion suppression for hall sensor arrangements - A method and apparatus is provided for processing signals from a Hall effect device arrangement coupled to a monolithic brushless DC motor where the motor is driven by a PWM circuit providing PWM drive signals. | 11-06-2008 |
| 20090230904 | NOISE SUPPRESSION FOR HALL SENSOR ARRANGEMENTS - A method and apparatus is provided for processing signals from a Hall-effect device arrangement coupled to a monolithic brushless DC motor where the motor is driven by a PWM circuit providing PWM drive signals. | 09-17-2009 |
