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| Number | Title | Issue Date |
| 8190005 | Motor driving circuit and load driving apparatus with pulse width modulation When the bit number of an error signal ERR2 is n and the magnitude of the error signal ERR2 is “a” (a is an integer) in decimal notation, a pulse-width modulator generates a PWM signal Spwm as a set of k (k is an integer of 2 or more) continuous su... | 05/29/2012 |
| 8072167 | Time delay logic of motor control Circuitry for controlling a motor, such as a brushless motor (BLM), is disclosed. The circuitry may comprise one or more inputs for receiving rotor position signals from one or more Hall effect sensors that detect the position of, for example, a BLM rotor. The circu... | 12/06/2011 |
| 8055124 | System for controlling rotary speed of computer fan A system can control a rotary speed of a computer fan according to the type of the computer fan. If the computer fan is determined to be a 3-pin fan, the system can output a changeable voltage to control the rotary speed of the 3-pin fan. ... | 11/08/2011 |
| 8050543 | Trigger mechanism for current acquisition used for motor control applications A trigger mechanism for starting current acquisition for motor control applications is disclosed. The present invention may generate an edge (ADC trigger) that can be used to start current acquisition by the ADC. The present invention may reduce the overhead involve... | 11/01/2011 |
| 8036518 | Motor and motor speed controlling system A motor and a motor speed control system are disclosed. Two power signal lines and one feedback/speed-control signal line are coupled between a control device and the motor. The two power signal lines electrically connect the control device to the motor. The feedbac... | 10/11/2011 |
| 7983539 | Control circuit for fan When the fan inserted in the fan header is a 4-pin fan, the control chip outputs PWM signals with different duty factors to the control pin of the fan header, to automatically change the rotary speed of the 4-pin fan. When the fan inserted in the fan header is a 3-p... | 07/19/2011 |
| 7949233 | Method and device for controlling a heat-dissipating fan for an electronic component A method for controlling a heat-dissipating fan for an electronic component includes the steps of: detecting a temperature of the electronic component, and outputting a first control signal corresponding to the temperature thus detected; receiving a load current of ... | 05/24/2011 |
| 7917017 | Motor drive apparatus and method If a PWM duty instruction D1 determined by a duty calculation circuit exceeds an upper limit value, a duty signal processing circuit in a motor drive apparatus divides a switching current supply period in each of the phases into a first current supply period ... | 03/29/2011 |
| 7826722 | Driving apparatus for fan motor A driving apparatus for fan motors, electrically connected between a pulse width modulation (PWM) signal generator and a controller, includes a converter electrically connected to the PWM signal generator, generating a first reference voltage according to the duty c... | 11/02/2010 |
| 7812556 | Phase logic circuits for controlling motors Circuitry for controlling motors, such as a brushless motor (BLM), is disclosed. The circuitry may comprise one or more inputs for receiving rotor position signals from one or more Hall effect sensors that detect the position of, for example, a BLM rotor. The circui... | 10/12/2010 |
| 7796867 | Motor drive device and cooling device using the same A drive circuit of a fan motor is provided. In an embodiment of the drive circuit, a first PWM comparator compares a temperature detection voltage with a cyclic voltage, and outputs a first PWM signal. A second PWM comparator compares a minimum frequency setting vol... | 09/14/2010 |
| 7795827 | Control system for controlling motors for heating, ventilation and air conditioning or pump The present invention discloses a control system for controlling a motor for a heating, ventilation and air conditioning (HVAC) or a pump comprising: an opto-isolated speed command signal processing interface into which a signal for controlling a speed of the motor ... | 09/14/2010 |
| 7759889 | Motor drive device and electric apparatus using the same A motor drive device of the present invention includes: an output circuit provided with a switch element connected to a motor; a PWM signal generating circuit for generating a PWM signal having a duty corresponding to a ratio between a power supply voltage applied t... | 07/20/2010 |
| 7756402 | Method and circuit for controlling rotation speed of computer fan An exemplary method for controlling rotation speed of a computer fan includes: judging the type of a fan by comparing two rotation speeds detected before and after changing a duty cycle of a PWM signal respectively; controlling the computer fan as a 4-pin fan the PW... | 07/13/2010 |
| 7747146 | Motor controller having a multifunction port In one aspect, a control circuit to control a speed of a motor includes a control logic circuit connected to a multifunction port. The control logic circuit is configured to receive a control signal provided at the multifunction port and to provide response signals ... | 06/29/2010 |
| 7742688 | Circuit for controlling rotation speed of computer fan A circuit for controlling rotation speed of a computer fan includes a fan connector providing for controlling the rotation speed of the computer fan, a rotation speed detector providing for detecting the rotation speed of the computer fan, a BIOS chip connected to t... | 06/22/2010 |
| 7729599 | Optimized determination of the after-run voltage in DC motors A device and a method are provided for determining the after-run voltage of a direct current motor which is operated via cycled control. In normal operation the direct current motor is controlled via PWM control and a first specifiable pulse/no-pulse ratio. An evalu... | 06/01/2010 |
| 7623770 | Fan control system A fan control system includes a power source, a switch control circuit, a switch control signal delivering unit and a fan circuit module. The power source outputs a nominal power, the switch control circuit electrically connects to the power source, the switch contr... | 11/24/2009 |
| 7599612 | Method of calibrating a motorized roller shade Calibration of a motorized roller shade is accomplished by calculating a radius of a roller tube and thickness of a shade fabric rotatably supported by the roller tube. First, a lower edge of the shade fabric is moved to a first position at a first linear distance f... | 10/06/2009 |
| 7590334 | Motor controller In one aspect, a control circuit to control a speed of a motor includes a PWM oscillator configured to generate a PWM output signal having a duty cycle. The speed of the motor is controlled by the PWM output signal to be proportional to the duty cycle. The control c... | 09/15/2009 |
| 7580617 | Electric fan device and method of driving electric fan device An electric fan device includes a motor which drives an electric fan for a vehicle, a control switch which controls a motor current supplied to the motor, and a control unit which controls an on/off operation of the control switch with pulse-width modulation. The co... | 08/25/2009 |
| 7509032 | Motor drive control circuit and motor apparatus using the same A motor drive control circuit includes a rotation control amplifier that compares the lower of a voltage limiting reference voltage of a reference voltage source and a rotation speed control voltage, which controls the rotation speed of the motor, on a terminal with... | 03/24/2009 |
| 7444070 | Fan motor with digital controller for applying substantially constant driving current An improved fan arrangement features a radial or diagonal fan (370) with which a direct current motor (32) is associated as its drive motor, further comprising a digital control element (23, 24) which executes a program, for controlling the curr... | 10/28/2008 |
| 7443119 | Circuit and method for controlling the rotating speed of a BLDC motor A circuit and a method for controlling the rotating speed of a brushless direct current (BLDC) motor are provided, whose goal is solving the stall problem encountered by conventional BLDC motors driven by pulse width modulation (PWM). The circuit includes a closed-l... | 10/28/2008 |
| 7421193 | Digital motor control system and method A digital motor control system utilizes time duration electric pulses generated by digital logic to control the motor speed and direction of rotation of a D.C. or A.C. motor. The digital logic produces width modulated pulses that can be connected to large or small e... | 09/02/2008 |
| 7411368 | Electric motor speed controller for vehicle An electric motor speed controller for use in a bicycle includes a motor to provide a propulsion force to move the bicycle. The actual motor speed and a target motor speed are compared, and if the actual motor speed is lower, more current is supplied to the motor, a... | 08/12/2008 |
| 7403700 | Motor control device A motor control device is used to control a motor to rotate. The motor control device includes a phase-wave signal sampling module, a first waveform modulating module, a second waveform modulating module and a control signal integrating module. The phase-wave signal... | 07/22/2008 |
| 7382105 | Motor driving device and electric power steering apparatus In a motor driving device where a motor having a winding wire with small inductance value is driven by a digital control means comprised of control means including a current command value calculating means, a current control means and a PWM control means whose sampl... | 06/03/2008 |
| 7375486 | Method and circuit for controlling motor speed A method of controlling a rotational speed of a fan motor for a heat generating electronic component includes the following steps: (1) obtaining an original PWM pulse in response to an internal die temperature of the electronic component, the original PWM pulse havi... | 05/20/2008 |
| 7369386 | Overcurrent protection for solid state switching system Current sensing resistors are connected directly to output terminals of MOSFETs forming the series switching stage of a PWM sinewave dimmer. An analog sensed current signal is coupled through an EMI resistant current link to comparators that provide an overcurrent i... | 05/06/2008 |
| 7368886 | Method of testing motor torque integrity in a hybrid electric vehicle A method of testing an electric motor that is adapted to provide a desired electric motor output torque to a vehicle powertrain system comprising an engine and the electric motor which are operatively and selectively coupled to a transmission. The method includes th... | 05/06/2008 |
| 7365508 | Motor, actuator and controller thereof A motor comprises: coil on/off switching devices for switching between an on-state wherein current is supplied to the coils, and a first off-state wherein the coil terminals are open-circuited or a second off-state wherein the coil terminals are short-circuited; and... | 04/29/2008 |
| 7365511 | Methods to control high speed electric machines having a front-end EMI filter attached A system and method for extracting estimated input voltage and input current values of an AC motor based on sensed power inverter output voltage and output current when the AC motor is connected to a front-end EMI filter and the EMI filter is connected to a power in... | 04/29/2008 |
| 7361844 | Power converter package and thermal management Power conversion apparatus includes a circuit board with power conversion circuitry and a package having an upper portion and a lower portion that respectively enclose circuitry on a top surface and a bottom surface of the circuit board. The lower portion encloses a... | 04/22/2008 |
| 7359066 | Electro-optical measurement of hysteresis in interferometric modulators Disclosed herein are methods and apparatus for testing interferometric modulators. The interferometric modulators may be tested by applying a time-varying voltage stimulus and measuring the resulting reflectivity from the modulators. ... | 04/15/2008 |
| 7355359 | Universal apparatus for driving diverse fans A universal driving apparatus of a computer system, including a receptacle, a power switch, an integrator and a comparator, is provided to identify and drive a first fan and a second fan. The receptacle connects to the first fan or the second fan for electricity sup... | 04/08/2008 |
| 7355364 | Motor and controller inversion: commanding torque to position-controlled robots Systems and methods are presented that cancel the dynamics of a motor and a joint controller in the presence of communication time delays, measurement noise, and controller parameter uncertainties inherent in a robot system. A cancellation system includes feedback o... | 04/08/2008 |
| 7325361 | Apparatus and method for providing a modular sliding door mechanism A modular drive assembly for a sliding door, comprising: a guide track having a hinge slidably received therein; a pair of pulleys disposed on either end of the guide track; a pair of cables each having an end that is secured to the hinge and the other end is secure... | 02/05/2008 |
| 7327114 | Fan control utilizing bi-directional communications A system and method for bi-directional communication between a system controller and a fan controller: The system operates in two modes and there are two communication paths between the system controller and the fan controller. The first communication path provides ... | 02/05/2008 |
| 7323838 | Motor control method and device thereof A motor control method and device. The motor control device includes a programmable integrated circuit (IC) receiving a phase signal, the phase of which is consistent with the rotation phase of a coil of the motor. The programmable IC generates a duty-cycle signal i... | 01/29/2008 |
