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| Number | Title | Issue Date |
| 7949235 | Electronic module and arrangement for signal transmission with the former The invention concerns an electronic module for a motor vehicle, in particular a fan regulator (4″) with a control input (S) for a signal, in particular a pulse width modulated signal, transmitted via a signal line (3). The electronic module is desig... | 05/24/2011 |
| 7567749 | Motor control circuit A motor control circuit includes a pulse width modulation (PWM) signal generating circuit, a driving circuit and a waveform-shaping circuit connected between the PWM signal generating circuit and the driving circuit. The PWM signal generating circuit generates a squ... | 07/28/2009 |
| 7398412 | Measure controlled delay with duty cycle control The disclosed embodiments relate to circuits that produce synchronized output signals. More specifically, there is provided a synchronization circuit adapted to receive an input signal, the synchronization circuit comprising a delay monitor adapted to produce a dela... | 07/08/2008 |
| 7348757 | Circuit to improve motor phase current reconstruction via DC link Apparatus for reconstructing the phase currents of a multiphase load driven by a multiphase inverter fed by a DC link and controlled by a PWM controller, the apparatus including a sensor in the DC link, first and second sampling arrangements for sampling the current... | 03/25/2008 |
| 7347177 | Fuel pump control An apparatus in a mechanical returnless fuel system is provided that includes a fuel pump motor for providing fuel to a powertrain system. A powertrain control module provides an activation signal for activating the fuel pump motor. A restraint control system includ... | 03/25/2008 |
| 7321213 | Motor controller A motor controller is provided with: an estimated temperature calculating means that calculates an estimated temperature of a motor; and a control unit that can perform a driving control of the motor only when the estimated temperature is not larger than a predeterm... | 01/22/2008 |
| 7321214 | Motor control system A controller is operable in one of a plurality of operational modes, which include an estimated temperature computation performing mode for performing computing of an estimated temperature of the motor and an estimated temperature computation non-performing mode for... | 01/22/2008 |
| 7317467 | System for controlling printer cooling fan A control system for a cooling fan of a laser printer enables selection of fan speed based on the actual degree of usage of the printer. The system provides first and second sets of fan speeds where each set contains information corresponding to a plurality of fan s... | 01/08/2008 |
| 7298103 | Control and motor arrangement for use in model train A control and motor arrangement in accordance with the present invention includes a motor configured to generate a locomotive force for propelling the model train. The control and motor arragement further includes a command control interface configured to receive co... | 11/20/2007 |
| 7294980 | Fan control system A fan control system. The system includes a plurality of fans, each having a control device. One of the fans is designated as a master fan and others are served as slave fans according to a specific designation method, wherein the control device of the master fan ac... | 11/13/2007 |
| 7290126 | One-chip microcomputer with multiple timers The present invention provides a one-chip microcomputer that can realize the control of cooling equipment, the control of the brightness of a display device, and the control of the charge and discharge of a battery without mounting an analog circuit. The one-chip mi... | 10/30/2007 |
| 7276875 | Multimode integrated modulation circuit for controlling fan rotating speed A multimode integrated modulation circuit for controlling the fan rotating speed mainly includes a voltage regulating circuit, an integrated modulation circuit and a fan motor driving circuit. The voltage regulating circuit is used to receive an external voltage sig... | 10/02/2007 |
| 7242857 | Motor control circuit A motor control circuit includes a pulse width modulation (PWM) signal generating circuit, a driving circuit and a waveform-shaping circuit connected between the PWM signal generating circuit and the driving circuit. The PWM signal generating circuit generates a squ... | 07/10/2007 |
| 7233121 | Fan speed control circuit A fan speed control circuit includes a pulse width modulation (PWM) signal generating circuit, a driving circuit and a phase compensation unit. The PWM signal generating circuit generates a PWM control signal with a sequence of alternating on-time and off-time, and ... | 06/19/2007 |
| 7231139 | Digital noise reduction for motors A system and method for reducing fan noise by controlling the drive current to the fan motor. In one embodiment the system approximates a linear drive using a number of transistors in parallel and sequentially deploying the transistors. In another embodiment, a sche... | 06/12/2007 |
| 7218846 | Fan speed control circuit A fan speed control circuit includes a pulse width modulation (PWM) signal generating circuit, a driving circuit and a phase compensation unit. The PWM signal generating circuit generates a PWM control signal with a sequence of alternating on-time and off-time, and ... | 05/15/2007 |
| 7205733 | Self-startup circuit for DC fan A self-startup circuit for a DC fan includes a voltage sampling device receiving a first control signal, a comparator, and a self-startup device. The comparator includes two input terminals and an output terminal. One input terminal is connected to an output termina... | 04/17/2007 |
| 7184654 | Semiconductor device control apparatus and method In a control apparatus for a motor, which rotates a fan, a semiconductor device is connected to the motor in series to drive the motor. An analog driver circuit drives the semiconductor device with an analog voltage. A PWM control circuit drives the semiconductor de... | 02/27/2007 |
| 7183734 | Sensorless control of two-phase brushless DC motor A motor control system for a two-phase brushless DC motor uses measured EMF voltage from the passive set of stator coils to control commutation. A microcontroller receives the EMF voltage measurement and compares it to a threshold voltage value, which may be speed-d... | 02/27/2007 |
| 7170242 | Pulse-width-modulation motor drive circuit A PWM motor drive circuit includes a drive IC member, a Hall IC member, a PWM converter circuit and a capacitor. The drive IC member electrically connects with the Hall IC member, the drive IC member further includes a pin electrically connected with the PWM convert... | 01/30/2007 |
| 7166976 | Method and control circuit for reducing line-bound disturbances in a pulse-width modulated control of an electric motor A method for reducing line-conducted interference in a pulse width modulated triggering system of an electric motor, a triggering pulse width modulation signal having, in one clock cycle, one or more signal edges between a first signal level and a second signal leve... | 01/23/2007 |
| 7151349 | Fan speed control A method of synchronizing a pulsed drive signal applied to a DC fan motor to the TACH output of the motor is described. DC motors include a rotor that rotates in a path defined by a plurality of magnetic poles and the method defines an ideal TACH output for a specif... | 12/19/2006 |
| 7081694 | Lead frame for connecting electronic components of an electric motor Device for connecting electronic components for driving an electric motor with a lead frame having tracks for connecting the power supply and phase windings of the electric motor, the tracks of the lead frame being designed for direct connection of the electronic co... | 07/25/2006 |
| 7075261 | Method and apparatus for controlling a fan A method and apparatus for controlling a fan is disclosed. In one embodiment, a method for controlling a fan includes applying power to the fan at startup. The fan may be supplied a predetermined amount of current, which may break the inertia of the fan propeller an... | 07/11/2006 |
| 7064462 | Power tools with switched reluctance motor A method of assembling a power tool, a power tool, a method of assembling an electrical device, and an electrical device includes a switched reluctance motor. The electrical device is preferably a hand-held power tool, however, any type of electrical device that inc... | 06/20/2006 |
| 7028784 | Motor-driven hand-held tool with functional step display A motor-driven hand-held tool includes a housing (4) having a switching recess (6) formed therein, an actuation member (8) displaceably arranged in the switching recess for shifting a functional unit between different functional steps, and and a... | 04/18/2006 |
| 7027721 | Temperature-rated variable speed control circuit of an electric fan An electric fan temperature-rated variable speed control circuit, includes a D.C. current source and fan activation IC. There are, between the current source positive and negative poles serially connected transistor, regulation tube, with the regulation tube negativ... | 04/11/2006 |
| 7019473 | Noiseless driving circuit for DC motor A noiseless driving circuit for direct current (DC) motor is disclosed. The driving circuit uses a magnetic-field sensing circuit with a Hall sensor to sense the corresponding position of the permanent magnet rotor. According to the corresponding position of the per... | 03/28/2006 |
| 7006762 | Pulse width modulator The present invention encompasses a high efficiency pulse width modulator comprising: a variable duty cycle oscillator for receiving an input signal and providing a low level switching signal; a source voltage differentiation dependant positive switching signal circ... | 02/28/2006 |
| 6997389 | Method and apparatus for delivering conditioned air using pulse modulation A method and apparatus for delivering conditioned air using short duty cycles during which a damper is fully open for a time and fully closed for the remaining time. Conditioned air is continuously supplied to a plenum at low pressure and is applied to the space whe... | 02/14/2006 |
| 6977487 | Vehicular alternator failure determination apparatus using commutating device voltage A vehicular alternator failure determination apparatus is capable of making a failure determination accurately. The apparatus includes a maximum voltage detection part (1) for detecting a maximum voltage of an alternator commutating device which commutates an... | 12/20/2005 |
| 6970643 | Radiator having a fan in variable rotation speed A radiator includes a voltage regulator for providing a reference voltage, a fan including a power end connected to the reference voltage via a first resistor and a feedback end for outputting a pulse signal indicating the rotation speed of the fan, an integration c... | 11/29/2005 |
| 6968707 | Variable speed, electronically controlled, room air conditioner A variable speed air handling system for cooling and/or heating a room and a method of controlling the system. The system includes a fan assembly to transport air from the system into the room, the fan assembly having a substantially continuously adjustable speed wi... | 11/29/2005 |
| 6944896 | Line voltage compensation system for power chair An apparatus, method and program product position a powered examination chair at a constant, desired speed despite fluctuations line voltage. A power signal supplied to an actuating motor of the chair is apportioned according to the line voltage supplied to the chai... | 09/20/2005 |
| 6946809 | Motor driving system A motor driving system includes a power supply unit, a voltage-stabilizing unit, a signal-generating unit, a comparing unit, and a control unit. The power supply unit provides an input supply voltage to each other unit in the system. The voltage-stabilizing unit inc... | 09/20/2005 |
| 6930867 | Thermally suppressing circuit for restarting a locked motor A thermally suppressing circuit includes a restart-charging drive member, a coil set, a restart-charging capacitor, and a charging switch set. The restart-charging drive member is electrically connected to the coil set and the restart-charging capacitor while the ch... | 08/16/2005 |
| 6912353 | Brushless DC ring motor cooling system A method of operating a cooling fan in a cooling system for a vehicle includes determining a required speed of the cooling fan. First and second signals are provided to a motor controller operatively connected to a motor having a rotatable portion connected to the c... | 06/28/2005 |
| 6828748 | Speed control circuit for a brushless dc motor A speed control circuit for a brushless dc motor includes a motor drive circuit, a drive member and a PWM control circuit. The motor drive circuit includes at least one coil and at least one transistor serially connected to the coil. The drive member is provided wit... | 12/07/2004 |
| 6693400 | Multi-mode motor controller chip set A multi-mode motor controller architecture includes a motor, an integrated circuit controller, and an integrated circuit driver circuit. The integrated circuit controller includes a pulse generator, a DAC, an ADC, and a digital compensator circuit. The in... | 02/17/2004 |
| 6433507 | Spread spectrum motor control circuit A motor control circuit for use in a motor circuit includes a varying duty cycle pulse width modulation circuit and a switch. The varying duty cycle pulse width modulation circuit is operable to generate a PWM signal having a varying duty cycle, wherein a... | 08/13/2002 |
