Thermal Condition Patents (Class 388/934)
  • Patent number: 8972115
    Abstract: A motor driven power steering (MDPS) may include: a vehicle speed sensor configured to sense vehicle speed; a temperature sensor configured to sense a temperature of a power pack; a current sensor configured to sense an amount of current applied to the MDPS; a storage unit configured to store a thermal resistance value based on the vehicle speed with respect to the temperature of the power pack; and a control unit configured to calculate an estimated temperature by reflecting the thermal resistance value based on the vehicle speed with respect to the temperature of the power pack and the current amount applied to the MDPS into a temperature estimation function, and drive a motor according to the calculated estimated temperature.
    Type: Grant
    Filed: February 12, 2014
    Date of Patent: March 3, 2015
    Assignee: Hyundai Mobis Co., Ltd.
    Inventor: Se Wook Oh
  • Patent number: 8829839
    Abstract: A system to monitor the temperature of power electronic devices in a motor drive includes a base plate defining a planar surface on which the electronic devices and/or circuit boards within the motor drive may be mounted. The power electronic devices are mounted to the base plate through the direct bond copper (DBC). A circuit board is mounted to the base plate which includes a temperature sensor mounted on the circuit board proximate to the power electronic devices. The temperature sensor generates a digital signal corresponding to the temperature measured by the sensor. A copper pad is included between each layer of the circuit board and between the first layer of the circuit board and the sensor. The circuit board also includes vias extending through each layer of the board. The copper pads and vias establish a thermally conductive path between the temperature sensor and the base plate.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: September 9, 2014
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Zoran Vrankovic, Rongjun Huang, Mark Cooper, David M. Brod
  • Patent number: 8749187
    Abstract: A computer-implemented fan control method includes measuring a temperature within a computer system and dynamically selecting a fan speed step in response to the temperature received, wherein the fan speed step is selected from a fan speed table defining a finite number of fan speed steps each having an associated fan speed. A fan is operated at the dynamically selected fan speed step, wherein the fan is positioned to drive air through the computer system where the temperature is being measured. The fan output variation is measured over a prescribed time interval and the fan speed table is automatically modified to change the fan speeds associated with each fan speed step, wherein the fan speeds are changed as a function of the measured fan output variation while continuing to drive the fan.
    Type: Grant
    Filed: July 30, 2013
    Date of Patent: June 10, 2014
    Assignee: International Business Machines Corporation
    Inventors: Diane S. Busch, Troy W. Glover, Whitcomb R. Scott, III
  • Patent number: 8628310
    Abstract: A fan system includes: two circuit breakers, a control module for controlling two circuit breakers, two electric motors to which their operating voltage UB is supplied via the circuit breakers, and at least one temperature sensor on a board on which the circuit breakers are located. The control module evaluates a signal TNTC from the temperature sensor, and sets the pulse duty factors TV1, TV2 of pulsed control voltages at the circuit breakers, while taking into account this signal as well as a requested fan power, in such a way that no power loss PV exceeding a specified value occurs at any circuit breaker.
    Type: Grant
    Filed: December 10, 2007
    Date of Patent: January 14, 2014
    Assignee: Robert Bosch GmbH
    Inventors: Stefan Koch, Patric Kahles, Volker Lurk
  • Patent number: 8403648
    Abstract: A compressor control device includes a driving circuit, for controllably supplying a coil of an electric motor of a compressor. A temperature sensor is thermally coupled to the driving circuit and provides a temperature sensing signal correlated to a temperature in the driving circuit. A control stage, coupled to the driving circuit and to the temperature sensor, selectively prevents the driving circuit from supplying the coil, in response to a minimum temperature increment being detected by the temperature sensor within a pre-determined control time window.
    Type: Grant
    Filed: January 18, 2008
    Date of Patent: March 26, 2013
    Assignee: STMicroelectronics Design and Application s.r.o.
    Inventor: Albert Boscarato
  • Patent number: 8364349
    Abstract: An angle calculator determines an angle of a rotor. An angular speed calculator determines an angular speed of the rotor. A command current calculator determines a command current defined on a dq-axis. An open loop controller determines a command voltage defined on the dq-axis in accordance with a circuit equation of a motor, based on the command current and the angular speed. A dq-axis/three-phase converter converts the command voltage into a three-phase command voltage. A resistance calculator and a ?-value calculator respectively determines circuit resistance including armature winding resistance and a number of armature winding linkages which are included in the circuit equation of the motor, based on temperature of the motor detected by a temperature sensor and with reference to a table or the like which is stored in advance.
    Type: Grant
    Filed: January 6, 2009
    Date of Patent: January 29, 2013
    Assignee: JTEKT Corporation
    Inventors: Takeshi Ueda, Shigeki Nagase, Hiroshi Sumasu
  • Patent number: 8358094
    Abstract: The invention relates to a method and arrangement having an electric machine, comprising a stator (4) and a rotor (1) and an infrared temperature sensor, wherein the detection field of the infrared temperature sensor is directed at an outer surface of the rotor (1). The infrared temperature sensor is a thermopile (6) for radiometrically contactlessly detecting a temperature of the rotor (1), the thermopile being arranged in a slot of the stator (4) and being compatible with standard slot-sealing-wedge components of the electric machine with regard to assembly, and thus enables the operational monitoring of the thermal state of an electric machine in a novel manner, such that adapted power states can be achieved.
    Type: Grant
    Filed: August 19, 2009
    Date of Patent: January 22, 2013
    Assignee: Siemens Aktiengesellschaft
    Inventor: Jürgen Zettner
  • Patent number: 8157536
    Abstract: A rotating speed adjustment circuit for a heat dissipation fan includes a first node, a second node, a reception end for receiving a first control signal, a first resistor coupled to a voltage source and the first node, a second resistor coupled to the first node and the second node, a third resistor coupled to the second node and a ground end, a capacitor coupled to the first node and the ground end, a transistor coupled to the reception end, the second node and the ground end, an oscillator for generating an oscillating signal, and a comparator for comparing a signal of the first node and the oscillating signal, so as to output a second control signal to control a rotating speed of the heat dissipation fan.
    Type: Grant
    Filed: December 24, 2008
    Date of Patent: April 17, 2012
    Assignee: Anpec Electronics Corporation
    Inventors: Tzu-Cheng Teng, Ching-Sheng Li, Ming-Jung Tsai, Shen-Min Lo
  • Patent number: 8035333
    Abstract: A fan motor speed control circuit includes: a driving circuit configured to drive a fan motor so as to run at a rotation speed corresponding to a drive signal; a comparison circuit configured to output a comparison signal for matching a rotation speed of the fan motor with a target rotation speed, based on a reference signal corresponding to the target rotation speed of the fan motor and a speed signal corresponding to the rotation speed of the fan motor; and a selection circuit configured to output to the driving circuit the drive signal corresponding to one signal out of the reference signal and the comparison signal, the one signal being a signal by which the fan motor is driven at a higher rotation speed.
    Type: Grant
    Filed: June 27, 2008
    Date of Patent: October 11, 2011
    Assignee: Semiconductor Components Industries, LLC
    Inventors: Tetsuya Yoshitomi, Takashi Harashima
  • Patent number: 7948196
    Abstract: A system comprising a chassis that includes a plurality of modules and a fan assembly disposed in a distal end of the chassis for drawing air in parallel pathways through the plurality of modules. At least one of the modules is a compute module having a thermal sensor disposed to sense the temperature of air flowing across a processor mounted on a motherboard. The system further comprises a fan controller receiving output from the thermal sensor, wherein the fan controller operates the fan assembly to cool the plurality of modules and maintain the thermal sensor output within an operating temperature range. The fan controller controls the fan speed according to predetermined thermal profile settings associated with one of the compute modules received in the chassis. For example, the predetermined thermal profile settings may include a minimum fan speed, a maximum fan speed, and control loop feedback settings.
    Type: Grant
    Filed: April 9, 2008
    Date of Patent: May 24, 2011
    Assignee: International Business Machines Corporation
    Inventors: Ralph Murray Begun, Raymond Mathew Clemo, Karl Klaus Dittus, Vinod Kamath, Michael Sven Miller, Warren Everett Price, Whitcomb Randolph Scott, III
  • Patent number: 7949234
    Abstract: A motor speed control circuit includes: a voltage generating circuit configured to change either a reference voltage corresponding to a target rotation speed of a motor or a speed voltage corresponding to a rotation speed of the motor, according to a temperature, and output the reference voltage and the speed voltage, either one of which is changed; a comparison circuit configured to compare the speed voltage output from the voltage generating circuit with the reference voltage output from the voltage generating circuit; and a driving circuit configured to drive the motor so as to match a level of the speed voltage to a level of the reference voltage, based on a comparison result from the comparison circuit.
    Type: Grant
    Filed: June 10, 2008
    Date of Patent: May 24, 2011
    Assignees: Sanyo Electric Co., Ltd., Sanyo Semiconductor Co., Ltd.
    Inventors: Takashi Harashima, Koichiro Ogino
  • Patent number: 7945985
    Abstract: Windshield wiper device (10), particularly for a motor vehicle, having at least an electric motor drive (24) is proposed. This comprises an electric motor drive, which can be driven with at least one first speed (V1) and one second speed (V2). According to the invention, a temperature detection means (40) for detecting the operating temperature of the drive (24) and at least one switching means (50) are provided, which, when operating the drive (24) at the second speed (V2), switches the drive (24) from the second speed (V2) to the first speed (V1) when a predetermined operating temperature (T1) is exceeded.
    Type: Grant
    Filed: February 14, 2005
    Date of Patent: May 24, 2011
    Assignee: Robert Bosch GmbH
    Inventor: Armin Stubner
  • Patent number: 7841837
    Abstract: The present invention discloses a cooling-fan rotation-speed control circuit, wherein a plurality of sets of input power sources respectively having different voltages is electrically and parallel coupled to a cooling fan; a switch is installed between at least one input power source and the cooling fan; the switch is turned on/off according to a rotation-speed parameter to determine whether the cooling fan is driven by a low-voltage driving power or a high-voltage driving power.
    Type: Grant
    Filed: August 17, 2006
    Date of Patent: November 30, 2010
    Assignee: Zippy Technology Corp.
    Inventor: Tsung-Chun Chen
  • Patent number: 7808192
    Abstract: A heat dissipation system includes at least one fan, at least two controllers, a signal generator, and a signal converter. The controllers are electrically connected to the fan and generate an enable signal according to a feedback signal of the fan. The signal generator is electrically connected to the controllers and generates a control signal according to the enable signal. The signal converter is electrically connected to the signal generator and the fan, converts the control signal to a drive signal to the fan, thereby controlling rotation speed of the fan.
    Type: Grant
    Filed: March 29, 2006
    Date of Patent: October 5, 2010
    Assignee: Delta Electronics, Inc.
    Inventors: Wen-Chuan Ma, Nien-Hao Hsu, Wen-Shi Huang
  • Patent number: 7791296
    Abstract: To precisely detect the temperature of a power assist motor without using a temperature sensor and enhance an overheating protection function. A calorific value calculating unit calculates a calorific value based upon the difference between a calorific value by current supplied to a motor and the quantity of heat radiation. The output of the calorific value calculating unit is accumulated and an accumulated value is input to an accumulated value buffer. A cumulative value TS acquired by adding initial temperature T0 to a cumulative value Td is input to a ratio map of a target current value, ratio is read, and a target base current value is limited according to the ratio. The cumulative value TS used in the map is not an actual motor current value and is calculated based upon unlimited current acquired in an unlimited current calculating unit.
    Type: Grant
    Filed: July 23, 2007
    Date of Patent: September 7, 2010
    Assignee: Honda Motor Co., Ltd.
    Inventor: Sumitaka Ogawa
  • Patent number: 7791300
    Abstract: An electric motor controller for a vehicle has a voltage detecting section for detecting the voltage of a filter capacitor inserted on a direct current side of an inverter device including a semiconductor element for large electric power; an electric current detecting section for detecting an output electric current of the inverter device; and a temperature detecting section arranged in a cooling means of the semiconductor element for large electric power. Loss generated by a switching operation of the semiconductor element for large electric power is sequentially calculated by outputs of the detecting sections. Excessive temperature is detected when junction temperature of the large electric power semiconductor element calculated by this loss reaches an allowable temperature.
    Type: Grant
    Filed: September 21, 2005
    Date of Patent: September 7, 2010
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yuji Katsuyama, Shigeru Kojima
  • Patent number: 7791301
    Abstract: An apparatus for detecting a type of fan and controlling the fan, the fan providing during operation a tachometer signal indicating a speed of the fan, the apparatus includes: a direct current (DC) generator for coupling to the fan and configured to provide a first voltage to the fan; a resistor for providing, while the DC generator provides the first voltage, a sensed voltage relating to the type of the fan, wherein the resistor is connected to a reference voltage and for coupling to a pulse-width modulation (PWM) control terminal of the fan; an input judgment component coupled to the resistor to receive the sensed voltage, the input judgment component being configured to determine whether the fan is a 4-wire PWM fan with an internal pull-up resistor based on the sensed voltage and to provide a judgment signal indicating the determination; a PWM generator coupled to the input judgment component to receive the judgment signal, the PWM generator being configured to provide to the fan a PWM control signal to co
    Type: Grant
    Filed: January 2, 2008
    Date of Patent: September 7, 2010
    Assignee: Nuvoton Technology Corporation
    Inventors: Shih-Feng Huang, Chia-Ching Lu, Ming-Che Hung
  • Patent number: 7782002
    Abstract: A switch-type power converter comprising an PET switch operating in a variable duty cycle mode under the control of a Unitrode 3846 integrated circuit controller. Indications of excess input voltage and reverse battery connections are provided by circuits including an element which permanently changes state. A cooling fan mounted on a finned heat sink is operated in a variable speed mode. A single thermistor sensor provides inputs to both the fan speed control and a thermal shutdown circuit connected to shut down the gate drives to the FET switch in the event of a high temperature condition. Another shutdown function is provided in response to an input overvoltage condition by way of an operational amplifier. The converter uses foldback for short circuit protection and is compatible with microprocessor units to selectively provide multiple output voltage levels.
    Type: Grant
    Filed: September 8, 2005
    Date of Patent: August 24, 2010
    Assignee: Progressive Dynamics, Inc.
    Inventor: James C. Cook, II
  • Patent number: 7768223
    Abstract: Kinematic control of an electronic positioner and its associated actuator is effected through a control algorithm that delivers energy to the actuator based on observed motion produced by a previous delivery of energy. The algorithm achieves control based on a desired or user-specified resolution. Electronic braking between energy delivery intervals improves the speed at which the desired position is achieved. Temperature of the force producing mechanism is determined, as by monitoring energy consumed, and used to control how power is delivered to the actuator.
    Type: Grant
    Filed: March 24, 2008
    Date of Patent: August 3, 2010
    Assignee: Peaktronics, Inc.
    Inventors: Peter W. Mueller, Jack M. Leason
  • Patent number: 7759891
    Abstract: The present invention provides an apparatus and a method for accurately detecting abnormal conditions of a motor. A ?Tc/Tj detector detects a difference (?Tc) between an environment temperature and a temperature of a field-effect transistor (FET) which turns on and off electric power supplied to a DC motor. A diagnosis control unit detects abnormal conditions such as a motor lock and a short circuit of the DC motor based upon the obtained difference. When the motor lock has been detected, the diagnosis control unit controls a pulse width modulation (PWM) control unit and a PWM oscillator (PWMOSC) and makes a frequency and duty cycle of a PWM signal lower. When the short circuit has been detected, the diagnosis control unit controls a gate driver and turns off the FET.
    Type: Grant
    Filed: August 1, 2007
    Date of Patent: July 20, 2010
    Assignee: Yazaki Corporation
    Inventors: Akira Serizawa, Byungeok Seo
  • Patent number: 7660067
    Abstract: A disk drive is disclosed including a disk, a head coupled to a distal end of an actuator arm, and a voice coil motor (VCM) operable to rotate the actuator arm about a pivot to actuate the head radially over the disk, wherein the VCM comprises a coil. Control circuitry within the disk drive measures a load resistance of the coil prior to executing a load operation, wherein the load operation moves the actuator arm off a ramp to load the head onto the disk. The load resistance of the coil is then converted into an initial coil temperature estimate.
    Type: Grant
    Filed: September 19, 2007
    Date of Patent: February 9, 2010
    Assignee: Western Digital Technologies, Inc.
    Inventors: Chuanwen Ji, Jianghong Ding, Duc T. Phan
  • Patent number: 7609018
    Abstract: A control device of a fan system includes a temperature sensing module, a comparing module and a driving module. The temperature sensing module senses an external temperature and generates a sensing signal according to the external temperature. The comparing module receives the sensing signal and outputs a comparing signal according to the sensing signal and a reference voltage signal. The driving module, which is electrically connected with the temperature sensing module and the comparing module, supplies a working voltage to the temperature sensing module and the comparing module, and outputs a rotating speed control signal according to the sensing signal or the comparing signal.
    Type: Grant
    Filed: September 17, 2007
    Date of Patent: October 27, 2009
    Assignee: Delta Electronics, Inc.
    Inventors: Yu-Liang Lin, Tsung-Jung Hsieh, Yueh-Lung Huang, Ming-Shi Tsai
  • Patent number: 7586281
    Abstract: Methods, apparatus, and articles of manufacture control a device or system that has an operational limit related to the rate or frequency of operation. The frequency of operation is controlled at a variable rate calculated to maximize the system or apparatus performance over a calculated period of time short enough that a controlling factor, such as power consumption, does not vary significantly during the period. Known system parameters, such as thermal resistance and capacitance of an integrated circuit (IC) and its package, and measured values, such as current junction temperature in an IC, are used to calculate a time-dependent frequency of operation for the upcoming time period that results in the best overall performance without exceeding the operational limit, such as the junction temperature.
    Type: Grant
    Filed: July 24, 2006
    Date of Patent: September 8, 2009
    Assignee: Intel Corporation
    Inventors: Aviad Cohen, Lev Finkelstein, Avi Mendelson, Ronny Ronen, Dmitry Rudoy
  • Patent number: 7504796
    Abstract: A running pattern of one cycle in a preset industrial machine is observed by a current detector and a temperature rise value estimating unit that are additionally provided in a traditional inverter device. The temperature rise value estimating unit derives a maximum temperature rise estimate value for each constituent element in the case where the running pattern is periodically repeated, on the basis of observation data of the one cycle and a temperature rise model of each constituent element of the inverter device.
    Type: Grant
    Filed: February 7, 2007
    Date of Patent: March 17, 2009
    Assignee: Fuji Electric FA Components & Systems Co., Ltd.
    Inventor: Takao Ichihara
  • Patent number: 7501777
    Abstract: A printer and a method of driving a cooling fan of the printer include a storage unit temporarily stores printing option data and image data, and a control unit controls an operation of a printing unit in one of a warming-up mode, a standby mode, a printing mode and a sleep mode based on the printing option data and the image data as inputted into the control unit. The control unit outputs a control signal variably controlling an RPM (Rotation Per Minute) of the cooling fan based on the operation mode and a printing speed of the printing unit. A cooling fan driving unit drives the cooling fan at a different RPM based on the control signal input from the control unit. Accordingly, the printer and the method of driving the cooling fan of the printer are capable of shortening the warming-up time to increase an initial printing speed, preventing the printing unit from being overheated, extending a lifespan of the cooling fan, and reducing a power consumption.
    Type: Grant
    Filed: June 4, 2003
    Date of Patent: March 10, 2009
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jin-su Yun, Cheol-ju Yang
  • Patent number: 7495407
    Abstract: A circuit for controlling rotational speed of a fan includes a sensor, a first chipset, and a second chipset. The sensor detects an ambient temperature and generates a corresponding temperature signal. The first chipset provides a pulse-width modulation signal to the fan for driving the fan, and receives a rotational speed signal from the fan. The second chipset defines a controlling relationship between the rotational speed of the fan and the temperature. The controlling relationship is that the temperature is partitioned into a plurality of temperature ranges and each of the temperature ranges corresponds to a rotational speed range. The temperature signal is transmitted from the sensor to the second chipset via the first chipset. The second chipset determines a rotational speed range according to the controlling relationship, and controls the first chipset to adjust the pulse-width modulation signal until the actual rotational speed of the fan is in the rotational speed range.
    Type: Grant
    Filed: July 14, 2006
    Date of Patent: February 24, 2009
    Assignees: Hong Fu Jin Precision Industry (ShenZhen) Co., Ltd., Hon Hai Precision Industry Co., Ltd.
    Inventors: Ting Huang, Qiu Hu
  • Patent number: 7443122
    Abstract: An electric drivetrain for a mobile machine is disclosed. The electric drivetrain has at least one power consuming device, a sensor associated with the at least one power consuming device, and a controller in communication with the power consuming device and the sensor. The sensor is configured to generate a signal indicative of a temperature of the power consuming device. The controller is configured to limit a power consumption level of the at least one power consuming device to an amount corresponding to a value of the signal.
    Type: Grant
    Filed: June 28, 2006
    Date of Patent: October 28, 2008
    Assignee: Caterpillar Inc.
    Inventors: William James Tate, Robert Paul Bertsch, Bruce H. Hein, Thuong Dao Anh Le
  • Patent number: 7414375
    Abstract: A fan voltage regulation control device includes a voltage regulation control unit for providing the power to a heat-dispersing fan, wherein the voltage regulation control unit is connected to a temperature detecting element and a voltage detecting unit. The temperature detecting element may influence the output power from the control unit to the fan, and through the voltage detecting unit, an input current to the fan can be maintained for providing overload and overheated protections.
    Type: Grant
    Filed: October 17, 2006
    Date of Patent: August 19, 2008
    Assignee: Zippy Technology Corp.
    Inventor: Tsung-Te Lee
  • Patent number: 7394215
    Abstract: A thermal control variable-speed circuit without switching noise is connected with a driving circuit, which controls the rotation speed of a fan motor using a driving voltage. The thermal control variable-speed circuit includes a reference voltage output circuit and a driving voltage control circuit. The reference voltage output circuit outputs a corresponding reference voltage signal according to ambient temperature changes. The reference voltage output circuit has one end connected to a first resistor in series and to a second resistor in parallel. The driving voltage control circuit outputs a corresponding driving voltage according to the magnitude of the reference voltage signal.
    Type: Grant
    Filed: October 14, 2003
    Date of Patent: July 1, 2008
    Assignee: Delta Electronics, Inc.
    Inventors: Ming-Shi Tsai, Yueh-Lung Huang, Ming-Lung Liu
  • Patent number: 7355362
    Abstract: A power supply with performance display is disclosed. The computer power supply mainly has a power converter, a control module, and a display. The control module receives and processes the operating signals from the power converter, and then sends those processed signals to a display in a numerical value form. The power supply can be applied in a computer, an adapter, or other electronic products, which is convenient for users to know the operating status of the power converter.
    Type: Grant
    Filed: May 25, 2005
    Date of Patent: April 8, 2008
    Assignee: Acbel Polytech Inc.
    Inventors: Ching-Yuan Pai, Jung-Tai Yeh, Hsin-I Yeh
  • Patent number: 7327115
    Abstract: There are included a control circuit to control sequence of excitation of a stepping motor, a switching circuit to switch electric power to be supplied to the stepping motor based on an instruction from the control circuit, and a stop circuit to stop an operation of the switching circuit in a case where temperature of the switching circuit becomes a specified temperature or higher, and the control circuit controls the switching circuit in a mode where the stop circuit operates before the stepping motor is damaged by heat.
    Type: Grant
    Filed: March 7, 2006
    Date of Patent: February 5, 2008
    Assignee: Seiko Epson Corporation
    Inventor: Yasuhiko Yoshihisa
  • Patent number: 7312593
    Abstract: An apparatus for the thermal regulation of an AC drive for providing power to a motor includes a temperature sensor producing a signal indicative of temperature, a heater resistor connectable across a DC link of the AC drive, and a first switch. A controller is operable to monitor the temperature signal and control the first switch to provide power via the DC link to the heater resistor if the sensed temperature is below a predetermined setpoint.
    Type: Grant
    Filed: August 21, 2006
    Date of Patent: December 25, 2007
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: John T. Streicher, Steven J. Perreault, Jeffrey P. Rivard, David W. Siegler
  • Patent number: 7291995
    Abstract: An air fan rotation speed control method and a structure thereof aim to provide an automatic control mode and a manual control mode at the same time to control rotation speed regulation of an air fan to achieve instant heat dissipation for an environment and reduce temperature rising of the environment efficiently. The present invention has a rotation speed determination mechanism that adopts the higher rotation speed request at a higher priority to regulate the rotation speed of the air fan in either control mode. Hence the temperature of the environment can be reduced at the higher rotation speed.
    Type: Grant
    Filed: February 24, 2006
    Date of Patent: November 6, 2007
    Assignee: Zippy Technology Corp.
    Inventor: Tsung-Chun Chen
  • Patent number: 7271561
    Abstract: Fan module and control device thereof. The fan module comprises a plurality of fans and the control device. The control device comprises a temperature sensing circuit, and a driving circuit. The temperature sensing circuit detects an ambient temperature of the fans and generates a sensing signal accordingly. The driving circuit is coupled between the fans and temperature sensing circuit, and comprises a fully powered operating mode and a power-saving operating mode, wherein the driving circuit selects different operating modes in accordance with the sensing signal, and generates a fan driving signal controlling the speed of the fans.
    Type: Grant
    Filed: March 29, 2006
    Date of Patent: September 18, 2007
    Assignee: Delta Electronic, Inc.
    Inventors: Chien Hua Chen, Chun-Lung Chiu, Wen-Chuan Ma, Wen-Shi Huang
  • Patent number: 7248006
    Abstract: A system for controlling an electric motor comprises, in one embodiment, an encoder; a central processor in communication with said encoder; a module processor in communication with said central processor; feedback circuitry in communication with said module processor, wherein said encoder is an electronic device that provides rotor and stator positional information to said central processor, and further comprising a user interface in communication with said central processor, wherein said user interface enables a user to select preferred operational parameters for an electric motor. Another embodiment comprises a method for controlling an electric motor, comprising: determining rotor position based on data received from an encoder; determining how to energize stator coils; directing a power module to provide appropriate current to appropriate coils; and monitoring rotor response, wherein determining how to energize stator coils comprises consulting a look-up table.
    Type: Grant
    Filed: July 1, 2003
    Date of Patent: July 24, 2007
    Assignee: XIDEM, Inc.
    Inventors: James L. Bailey, Kyle J. Bunch
  • Patent number: 7205740
    Abstract: A fan controlling device for a frequency converter, which is applied to a high-power frequency transforming system that installs fans according to the heat dissipating requirements and their switching operation, failure detection and control, and the fan controlling device includes a frequency transformer and a plurality of direct current fans connected to the frequency transforming system, and each fan is installed at a desired position for dissipating heat in a casing of the frequency transformer by locking, sliding tracks, drawing or latching and each fan is connected to a fan controlling device, and a sensor of the fan controlling device detects the temperature of each set temperature point for switching the fans, controlling the operating number and speed of the fans, so as to improve the quantity, position, operability of installed fans as well as reducing the power consumption when the fans are at an idle state.
    Type: Grant
    Filed: March 17, 2006
    Date of Patent: April 17, 2007
    Assignee: Delta Elctronics, Inc.
    Inventors: Ta-Chang Wei, Ming-Hsiang Tzeng, Chih-Hsiung Tsai
  • Patent number: 7199542
    Abstract: A fan operation adaptive control system is proposed, which is designed for use with an electronic system, such as a network server, for providing the network server with an adaptive operation control function; and which is characterized by the utilization of a CPLD (Complex PLD, where PLD=Programmable Logic Device) module for implementing the adaptive operation control function for various different types of fan units, including PWM-driven type (which includes 100 Hz–500 Hz, 10 KHz–50 KHz, and 1 MHz–5 MHz subtypes) and DC-driven type, such that the network server can be equipped with just one type of temperature sensor which can be used in conjunction with these various different types of fan units. This feature allows the maintenance of heat-dissipating fan units on network servers to be more convenient and cost-effective to implement than the prior art.
    Type: Grant
    Filed: March 15, 2006
    Date of Patent: April 3, 2007
    Assignee: Inventec Corporation
    Inventor: Ting-Kai Chen
  • Patent number: 7166978
    Abstract: An electric motor system includes an electric motor, a temperature sensor mounted therein capable of measuring a local temperature and generating a temperature related signal, and a processor configured to calculate an actual temperature of a rotor magnet from the temperature related signal, and an actual output torque from the actual rotor magnet temperature. A method for determining the actual output torque of a motor includes sensing a temperature within the motor, calculating a rotor magnet temperature from the sensed temperature, and calculating the actual output mechanical torciue from the rotor magnet temperature.
    Type: Grant
    Filed: June 6, 2005
    Date of Patent: January 23, 2007
    Assignee: Kendro Laboratory Products, LP
    Inventors: David M. Carson, Richard Hall
  • Patent number: 7148643
    Abstract: A single-phase motor driving circuit includes a controller for outputting a control signal to drive a single-phase motor in a period in which a saw-tooth voltage of a predetermined cycle is larger than a duty setting voltage based on a result of comparing a detected temperature voltage changed based on a temperature detected by a temperature detecting device with a starting duty setting voltage increased with time while a voltage smaller than the detected temperature voltage at the time of starting the single-phase motor is set as an initial value. The controller sets the duty setting voltage as the starting duty setting voltage when the result of the comparison shows that the starting duty setting voltage is smaller than the detected temperature voltage, and the duty setting voltage as the detected temperature voltage when the starting duty setting voltage is larger than the detected temperature voltage.
    Type: Grant
    Filed: August 9, 2005
    Date of Patent: December 12, 2006
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Tetsuya Yoshitomi, Yasuyuki Ueshima
  • Patent number: 7141953
    Abstract: Methods, apparatus, and articles of manufacture control a device or system that has an operational limit related to the rate or frequency of operation. The frequency of operation is controlled at a variable rate calculated to maximize the system or apparatus performance over a calculated period of time short enough that a controlling factor, such as power consumption, does not vary significantly during the period. Known system parameters, such as thermal resistance and capacitance of an integrated circuit (IC) and its package, and measured values, such as current junction temperature in an IC, are used to calculate a time-dependent frequency of operation for the upcoming time period that results in the best overall performance without exceeding the operational limit, such as the junction temperature.
    Type: Grant
    Filed: September 3, 2004
    Date of Patent: November 28, 2006
    Assignee: Intel Corporation
    Inventors: Aviad Cohen, Lev Finkelstein, Avi Mendelson, Ronny Ronen, Dmitry Rudoy
  • Patent number: 7102308
    Abstract: A method and system for variable speed fan control for thermal management of a device includes disposing a first temperature sensor proximate a variable speed fan to measure an air temperature of inlet air Tair that cools the device by convection air flow. A controller is configured to compensate for changes in Tair by varying a convection coefficient (h) which is a strong function of air velocity to maintain the product of h*?T at a constant value, wherein ?T is a temperature differential between the device (TAD) minus Tair. Thus, h is varied by varying air velocity by varying a speed of the variable speed fan.
    Type: Grant
    Filed: June 25, 2004
    Date of Patent: September 5, 2006
    Assignee: General Electric Company
    Inventors: Joseph James Lacey, Ashutosh Joshi
  • Patent number: 7038408
    Abstract: A fan motor speed control circuit includes a driving circuit, a voltage division circuit, and a speed modulator. The voltage division circuit has a first transistor and a plurality of resistors and is connected between a voltage source and the driving circuit. The speed modulator has a second transistor and a plurality of parallel resistors and is connected between the voltage division circuit and the driving circuit. The current of the fan motor speed control circuit flows through a first path under a first input voltage generated from the voltage source and through a second path under a second input voltage larger than the first one; the parallel resistors are in the second path such that the current value passing through the driving circuit varies according to the resulting resistance value of the parallel resistors.
    Type: Grant
    Filed: June 4, 2004
    Date of Patent: May 2, 2006
    Assignee: Delta Electronics, Inc.
    Inventors: Yu-liang Lin, Yueh-lung Huang, Tsung-yu Lei, Ju-wen Hsieh, Wen-shi Huang
  • Patent number: 7027721
    Abstract: 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 negative pole linked to the current source negative pole, and its positive pole, incorporated to form the primary current. Between triode base and collector lies a serially connected resistor. The triode collector is linked to the current source positive pole, and between its base and collector lies a serially connected rectifying resistor, which bypasses through the base to connect with the fan activation IC for sending out fan rotation speed control signals with which to form a circuit that adopts a straightforward, easy-to-implement method that offers low-cost and dependable temperature-control characteristics.
    Type: Grant
    Filed: November 24, 2003
    Date of Patent: April 11, 2006
    Inventor: Chin-Ping Wu
  • Patent number: 7005820
    Abstract: Temperature of the disk drive is measured using components of the disk drive without the need of including a separate temperature sensor to optimize performance of the spindle motor during startup. To measure temperature, the resistance of the VCM winding is measured and used to estimate the spindle bearing temperature. Back emf is measured from VCM windings and used during startup to accurately determine actuator position. Because the VCM coil resistance varies significantly with temperature, coil resistance variations with temperature are determined to enable compensation for inaccuracies in determination of actuator velocity. This inferred temperature is then used to optimize the start up procedure for the spindle motor to accommodate the increased frictional loading of the spindle bearing. In this way an improved performance in the reliability and spin up operation time can be realized without the addition of a separate temperature measurement hardware element.
    Type: Grant
    Filed: July 28, 2003
    Date of Patent: February 28, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventor: Brian K. Tanner
  • Patent number: 6992448
    Abstract: A motor control apparatus capable of protecting a motor from overheat while changing smoothly a motor output characteristic as a function of time lapse and mitigating overhead involved in arithmetic operation includes a current command value generator for generating current command values for a motor (1) having a polyphase winding, and motor current value detecting circuits (3u, 3v) for detecting motor current values (iu, iv), to drive the motor (1) on the basis of the motor current values and current command values. The apparatus further includes a PWM inverter (4) for driving the motor (1) and a microcontroller (5) for controlling the PWM inverter (4). The microcontroller (5) limits the motor current values in dependence on integrated values of function values determined by fitting transformed current values determined through predetermined coordinate transformation of the phase currents (iu, iv, iw) to a predetermined function.
    Type: Grant
    Filed: July 22, 2004
    Date of Patent: January 31, 2006
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Chiaki Fujimoto, Takayuki Kifuku
  • Patent number: 6970643
    Abstract: 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 circuit including an output end, and an input end connected to the feedback end of the fan for converting the pulse signal from the feedback end into a voltage signal, and a thermistor connected between the output end of the integration circuit and the reference voltage, for detecting temperature changes in order to adjust the rotation speed of the fan.
    Type: Grant
    Filed: July 4, 2004
    Date of Patent: November 29, 2005
    Assignee: BenQ Corporation
    Inventor: Wei-Chun Chang
  • Patent number: 6927549
    Abstract: An electric motor control unit mounted in an automotive vehicle having a motor that is variable in its rotational speed. A temperature sensing element is arranged to contact a busbar so that relays permit switching operation in response to detection of abnormal heat generation. This controls an electrical power supply to the motor to decrease the rotational speed of the motor without complete stopping of the motor. The rotational speed of the motor returns to a normal speed from the decreased speed by switching operation of the relays with diminishing of the abnormal heat generation.
    Type: Grant
    Filed: February 19, 2003
    Date of Patent: August 9, 2005
    Assignee: Yazaki Corporation
    Inventors: Hiroyuki Ashiya, Makoto Nakayama, Hironori Saito
  • Patent number: 6911793
    Abstract: An operating procedure for the motor (1) of an electric powered tool. The operating idle speed of the motor (1) is set to a value using regulator electronics (4), and the operating speed is the same as a chosen operating speed (n1). The motor (1) runs on a pre-determined and higher idle speed (n2) for cooling purposes after a specific idle time (?T). while the motor (1) runs on the pre-determined operating idle speed (n1). The engine speed is immediately set to the operating speed (n1) once again, when the motor requires a moment of strain at a certain period of time (T3) to maintain simple and comfortable operating procedures.
    Type: Grant
    Filed: December 16, 2003
    Date of Patent: June 28, 2005
    Assignee: Hilti Aktiengesellschaft
    Inventors: Frank Fritsch, Hermann Schuster
  • Patent number: 6900607
    Abstract: A method and system for estimating a parameter of an electric machine, including a controller and a switching device, the controller responsive to at least one of: a current sensor, and a temperature sensor. Where the controller executes a parameter estimation process, which is responsive to at least one of: a current value, a torque command and the resultant of the parameter estimation process representing an estimated parameter of the electric machine. The parameter estimation includes a method for estimating a temperature of the electric machine comprising: a temperature sensor operatively connected to and transmitting a temperature signal corresponding to a measured temperature to a controller, which executes a temperature estimation process responsive to a temperature signal from a temperature sensor.
    Type: Grant
    Filed: December 11, 2001
    Date of Patent: May 31, 2005
    Assignee: Delphi Technologies, Inc.
    Inventors: Julie A. Kleinau, Steven J. Collier-Hallman, Ashok Chandy, Ravindra P. Patankar, Daniel W. Shafer, Jeffery A. Zuraski
  • Patent number: 6891347
    Abstract: Various systems and methods are provided for cooling a cabinet. In one embodiment, a method is provided that comprises the steps of controlling a speed of the at least one cooling fan in response to a temperature of the cabinet, and, controlling the speed of the at least one cooling fan in response to a position of an access panel relative to the cabinet.
    Type: Grant
    Filed: October 9, 2002
    Date of Patent: May 10, 2005
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Robert W. Dobbs, James K. Koch, Jeremy I. Wilson