Using A Linearly Acting Final Control Device Patents (Class 323/303)
  • Patent number: 10411703
    Abstract: A clock driver circuit. In some embodiments the clock driver circuit includes an output stage, a first voltage source, and an output impedance adjusting circuit. The output stage includes a first transistor connected to the first voltage source and to an output of the drive circuit. The drive circuit is configured to operate in one of, at least, a first state, and a second state. The output impedance adjusting circuit is configured to reduce a difference between an output impedance of the drive circuit in: the first state, in which the first transistor is turned on and the first voltage source is at a first supply voltage, and the second state, in which the first transistor is turned on and the first voltage source is at a second supply voltage different from the first supply voltage.
    Type: Grant
    Filed: August 23, 2018
    Date of Patent: September 10, 2019
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Vaibhav Tripathi
  • Patent number: 9775207
    Abstract: The disclosure is directed at a method and apparatus for configuring and powering light fixture loads for a LED low voltage distribution system. The method and apparatus include converting power being supplied for powering the set of light fixture loads and then limiting this converted power to a set of multiple current outputs supplied to the light fixture loads. The multiple current outputs are then split or regrouped prior to being delivered to the light fixture loads.
    Type: Grant
    Filed: March 15, 2016
    Date of Patent: September 26, 2017
    Assignee: LUMASTREAM CANADA ULC
    Inventors: David Tikkanen, Jason Neudorf, Steven Lyons, Kyle Hathaway
  • Patent number: 9742596
    Abstract: A decision feedback equalizer includes a positive signal line, a negative signal line, a sense amplifier, a feedback driver, a load unit, a differential driver, and a charge pump. The differential driver maintains a difference between the first voltage of the positive signal line and the second voltage of the negative signal line at a last time point of the normal period to be equal to or greater than the reference voltage by adjusting strength of the positive input current corresponding to a positive input signal and strength of the negative input current corresponding to a negative input signal based on a temperature signal. The charge pump provides a positive offset voltage and a negative offset voltage to the positive signal line and the negative signal line, respectively. The positive offset voltage and the negative offset voltage are used to maintain an average voltage of the first voltage and the second voltage at the last time point of the normal period at a first value.
    Type: Grant
    Filed: March 24, 2016
    Date of Patent: August 22, 2017
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Prateek Kumar Goyal, Kang-Jik Kim, Jae-Hyun Park, Chang-Kyung Seong, Hwang-Ho Choi
  • Patent number: 9608526
    Abstract: A DC/DC converter 1 is configured to allow separation of a primary side constitution unit 3 and a secondary side constitution unit 4 of a transformer 2. A secondary side switching element FET 2 is provided in the secondary side constitution unit 4, and controls power supply to a load 12 by intermitting an output of a secondary winding L2. The primary side constitution unit 3 detects an electrical behavior of the primary side generated by the intermittent operation of the secondary side, and controls the power supplied from the primary winding L1 to the secondary winding L2 by operating the intermittent operation of the primary side switching element FET 1 such that a cycle or duty of the intermittent operation of the secondary side falls within a predetermined range.
    Type: Grant
    Filed: April 27, 2012
    Date of Patent: March 28, 2017
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Susumu Okura, Takashi Ohsawa
  • Patent number: 9608527
    Abstract: An apparatus includes an energy storage device, a driver circuit configured to receive energy from the energy storage device, and a bleed circuit configured to reduce an amount of the energy received by the driver circuit from the energy storage device. The bleed circuit is configured to reduce the amount of the energy received by the driver circuit during a startup period. The energy storage device may include a transformer, the driver circuit and bleed circuit being coupled to first and second windings of the transformer, respectively. A method includes receiving, by a driver circuit, energy from an energy storage device, and reducing, using a bleed circuit, the energy received by the driver circuit during a startup period. The energy storage device may include a transformer, the driver circuit and bleed circuit being coupled to first and second windings of the transformer, respectively.
    Type: Grant
    Filed: February 12, 2015
    Date of Patent: March 28, 2017
    Assignee: Marvell International Ltd.
    Inventors: Jinho Choi, Hao Peng, Biing Long Shu, Wanfeng Zhang
  • Patent number: 9531183
    Abstract: A circuit and method of over-voltage protection is provided to prevent the power supply to provide an exorbitant voltage to the electronic cigarette, the electronic cigarette case or the electronic cigarette charger; said circuit comprises a DC input terminal, a DC output terminal, a voltage sampling circuit, a switch control circuit and a switch circuit; the voltage sampling circuit is electrically connected with the DC input terminal and the switch control circuit respectively; the switch control circuit is electrically connected with the switch circuit; the switch circuit is electrically connected with the DC input terminal, the DC output terminal and the switch control circuit respectively. When implementing the present invention, an exorbitant voltage can be prevented to provide to the electronic cigarette, the electronic cigarette case or the electronic cigarette charger by the power supply, thus being protected from over-voltage as the exorbitant voltage may damage the products.
    Type: Grant
    Filed: April 25, 2013
    Date of Patent: December 27, 2016
    Assignee: HUIZHOU KIMREE TECHNOLOGY CO., LTD. SHENZHEN BRANCH
    Inventor: Zhiyong Xiang
  • Patent number: 9257847
    Abstract: Photovoltaic systems with managed output and methods for managing variability of output from photovoltaic systems are described. A system includes a photovoltaic module configured to receive and convert solar energy to DC power. The system also includes a sensor configured to detect a future change in solar energy to be received by the photovoltaic module. The system further includes a power conditioning unit coupled with the photovoltaic module and the sensor.
    Type: Grant
    Filed: October 12, 2009
    Date of Patent: February 9, 2016
    Assignee: SunPower Corporation
    Inventors: Robert Johnson, Adrianne Kimber, Carl J. S. Lenox, Matt Campbell
  • Patent number: 9112452
    Abstract: The present disclosure relates to power supply circuitry that has wide bandwidth and achieves high efficiency by using at least one energy storage element for efficient power transfer between two power supply circuits and to an amplitude modulated load. Specifically, the power supply circuitry may include a first power supply circuit, which may be a switching power supply circuit, a second power supply circuit, which may be a linear power supply circuit and may include the energy storage element, and control circuitry to facilitate efficient power transfer. The control circuitry may select one of multiple operating modes, which may include a first operating mode, during which the first power supply circuit may provide power to the energy storage element, and a second operating mode, during which the second power supply circuit may provide power to the amplitude modulated load from the energy storage element.
    Type: Grant
    Filed: July 14, 2010
    Date of Patent: August 18, 2015
    Assignee: RF Micro Devices, Inc.
    Inventor: Nadim Khlat
  • Publication number: 20150115928
    Abstract: In aspects of the invention, a zap circuit and a decoder for decoding the output of the zap circuit turn ON only one analog switch in a selector. The selector delivers an electric potential at a node of a dividing resistor selected by the zap circuit. The output of the selector is delivered to the non-inverting input of an operational amplifier, and the output of the operational amplifier is delivered to the gate terminal of a MOSFET. The operational amplifier controls the gate of the MOSFET so that the potential at a current detecting resistor equals the output of the selector. As a result, a current proportional to the input voltage flows through the MOSFET. Because the current through a dividing resistor is also proportional to the input voltage, the total current is eventually proportional to the input voltage.
    Type: Application
    Filed: September 29, 2014
    Publication date: April 30, 2015
    Inventor: Naoki KUMAGAI
  • Publication number: 20150115929
    Abstract: The disclosure provides a voltage regulator for generating piece-wise linear regulated supply voltage. The voltage regulator includes a first clamp circuit that receives a reference voltage and an analog supply voltage. A second clamp circuit receives the reference voltage. A voltage divider circuit is coupled to the first clamp circuit and the second clamp circuit. The voltage divider circuit receives a peripheral supply voltage and generates a regulated supply voltage.
    Type: Application
    Filed: October 1, 2014
    Publication date: April 30, 2015
    Applicant: Texas Instruments Incorporated
    Inventors: Sumantra Seth, Subrato Roy, Deepak Verma
  • Publication number: 20150102796
    Abstract: Aspects of the disclosure provide a circuit for peak voltage detection. The circuit includes a diode-based peak detector and a compensation circuit. The diode-based peak detector has a first diode, and is configured to receive a signal for peak voltage detection and generate a first voltage of a stable level indicative of a peak voltage of the signal based on the first diode. The compensation circuit has a second diode. The compensation circuit is configured to receive the first voltage and generate a second voltage of a stable level that is independent of the first diode.
    Type: Application
    Filed: October 9, 2014
    Publication date: April 16, 2015
    Applicant: MARVELL WORLD TRADE LTD
    Inventors: Ruiqiang LIU, Hongzheng HAN, Tuo WU
  • Publication number: 20150042304
    Abstract: An electronic circuit that changes a charge signal into a voltage signal within a sensor suitable for direct installation in a roadway can be connected to two single-core cables that need not be highly insulating yet can realize the required power supply of the electronics. The circuit includes an integrated impedance converter (IEPE) at the output to a two-core cable and a charge amplifier with an IC1 that has two inputs. A capacitor Cc is connected in series to the signal output of the sensor at one input of the IC1. A Zener diode D is arranged between the ground output of the sensor and the second input of the IC1 and can be supplied with power by a resistor R1 in conjunction with a power supply arranged on the output side in order to adapt the potential at the second input of the IC1.
    Type: Application
    Filed: March 26, 2013
    Publication date: February 12, 2015
    Inventors: David Cornu, Adrian Hofmann, Leo Amstutz, Roman Strebel, Claudio Cavalloni
  • Publication number: 20150022177
    Abstract: An adaptive low dropout voltage regulator (LDO) circuit having low power dissipation, and a method of regulating voltage while maintaining low power dissipation. Power dissipation in an LDO circuit is controlled and held to a low value using an LDO circuit that maintains a constant voltage difference between Vin and Vout; that is, ?V=Vin?Vout is approximately constant rather than linearly variable as a function of Vin. The output voltage Vout essentially tracks the input voltage Vin with an offset equal to ?V; Vout increases as Vin, but is kept between minimum and maximum voltage output specification limits.
    Type: Application
    Filed: July 22, 2013
    Publication date: January 22, 2015
    Applicant: Entropic Communications, Inc.
    Inventors: Branislav Petrovic, Joseph Nabicht
  • Patent number: 8933681
    Abstract: A novel integrated switched mode power supply circuit that provides supply voltages to an integrated circuit may be of minimal complexity and have the capacity for a wide range of input supply voltages. The novel power supply may include cascaded, unregulated step-down charge pumps (e.g. unregulated voltage splitters), one or more linear regulators coupled to the output of the cascaded voltage splitters, and a start-up current source to provide the IC supply current until the input supply voltage is sufficiently high for the voltage splitter(s) to be functional to provide the IC supply current. Furthermore, each voltage splitter may be activated or disabled depending on the value of the input supply voltage, and the input of a disabled voltage splitter may be shorted to its output via an integrated power switch. Using (cascaded) voltage splitters to provide the IC supply current reduces overall power dissipation in the IC.
    Type: Grant
    Filed: June 27, 2012
    Date of Patent: January 13, 2015
    Assignee: Intersil Americas Inc.
    Inventors: Demetri J. Giannopoulos, Aaron Shreeve
  • Publication number: 20150008896
    Abstract: A constant current and constant power method and system for controlling current drawn from a voltage source uses an electronic load device such as one or more field effect transistors connected with the voltage source via a switch. The load device is configured as a resistance device. A constant resistance, a cutover voltage, and either a constant current or a constant power are set by the user for the voltage source. When the switch is closed, a fixed current is drawn from the voltage source to the load and the voltage from the source is measured. The measured voltage is compared with the cutover voltage. When the measured voltage is less than the cutover voltage, the current to the load is maintained in accordance with the measured voltage and the constant resistance. When the measure voltage exceeds the cutover voltage, the current to the load device is switched to a constant current or the load device is switched to constant power.
    Type: Application
    Filed: July 2, 2013
    Publication date: January 8, 2015
    Inventor: Lance Palatini
  • Publication number: 20150002408
    Abstract: A transmission line interface circuit includes a voltage regulator to control a voltage swing of the transmission line interface circuit for signal transmission. The transmission line interface circuit includes complementary driver elements, including a p-type driver element to pull up the transmission line in response to a logic high, and an n-type driver element to pull down the transmission line in response to a logic low. The voltage regulator is coupled between one of the driver elements and a respective voltage reference to reduce a voltage swing of the transmission line interface circuit.
    Type: Application
    Filed: June 28, 2013
    Publication date: January 1, 2015
    Inventors: CHRISTOPHER P. MOZAK, RITESH B. TRIVEDI, JAMES A. MCCALL, AARON MARTIN
  • Patent number: 8901898
    Abstract: A power supply system includes a first connector, a second connector, a first circuit for detecting a magnitude of a current drawn from an energy source by the power supply system and providing a related output related, and a second circuit for adjusting an output voltage supplied to the second connector based on output of the first circuit. The output voltage supplied to the second connector is at a first value when the output of the first circuit is below a first threshold. Further, the output voltage supplied to the second connector is at a second value, greater than said first value, when the output of the first circuit is above a second threshold. The output voltage supplied to the second connector is at a third value, between said first and second values, when the output of the first circuit is between the first and second thresholds.
    Type: Grant
    Filed: November 14, 2011
    Date of Patent: December 2, 2014
    Assignee: Dell Products L.P.
    Inventors: So-Yu Weng, Wen-Hung Huang, Yung Fa Chueh
  • Publication number: 20140312872
    Abstract: A power supply circuit 1 includes an output circuit that generates an output voltage by performing a power supply operation based on an input voltage, an output terminal to which, after start-up of the power supply operation, the output voltage is applied, and a control circuit that causes a test current to flow between the output terminal and a ground. The control circuit detects, as a test voltage, a voltage at the output terminal in a test period in which the test current is caused to flow. When the test voltage at a predetermined judgment timing is lower than a judgment voltage, the control circuit judges that an output capacitor is connected and thus enables the power supply operation.
    Type: Application
    Filed: April 17, 2014
    Publication date: October 23, 2014
    Applicant: Rohm Co., Ltd.
    Inventors: Kiminobu Sato, Shinji Kawata
  • Patent number: 8847571
    Abstract: A wireless adapter for use in a two-wire process control loop includes wireless communication circuitry and first and second terminals configured to couple in series with the two-wire process control loop. A regulator having a regulated input is coupled to the first terminal and an output. A shunt is coupled to the output of the regulator and is configured to provide power to the wireless communication circuitry. A feedback circuit is configured to control current flowing from the regulator to the shunt as a function of a loop current flowing through the two-wire process control loop.
    Type: Grant
    Filed: June 17, 2009
    Date of Patent: September 30, 2014
    Assignee: Rosemount Inc.
    Inventor: John A. Kielb
  • Patent number: 8803503
    Abstract: The present invention relates to a quick response power supply switching device. It also relates to a power supply network equipped with such a switch. The electrical power supply is connected to a set of blocks, the device comprises at least one switch (3) connecting the power supply (VDD) and the block (1), the value of the power supply current passing through the switch being controlled according to the difference between the power supply voltage (VDD) at the level of the other blocks and voltage threshold. The invention applies notably to all integrated circuits of recent technology in which it is important to reduce the leakage currents of the transistors in the unused circuit parts. The invention thus applies particularly to most systems powered by cell or battery and more particularly to portable telephone circuits.
    Type: Grant
    Filed: July 18, 2008
    Date of Patent: August 12, 2014
    Assignee: Commissariat a l'Energie Atomique
    Inventor: Michel Harrand
  • Patent number: 8791936
    Abstract: The present invention relates to a LCD module and a method thereof. The LCD module includes a gate driver, a liquid crystal display panel having a plurality of pixel units, a temperature sensor for generating a temperature sensing signal based on a temperature of the liquid crystal display panel, and a voltage regulator for adjusting scan voltage according to the temperature sensing signal. The gate driver outputs a scan signal with the adjusted scan voltage to the plurality of pixel units. The LCD module can adjust the scan voltage based on a variety of the temperature of the LCD panel to further change current charging the pixel units, shortening a response time period of the LCD module.
    Type: Grant
    Filed: April 6, 2011
    Date of Patent: July 29, 2014
    Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd.
    Inventors: Dengxia Zhao, Yu Wu
  • Patent number: 8773104
    Abstract: The present invention discloses an on-time control module for compensating a switching frequency in a switching regulator. The on-time control module includes an average voltage generating circuit, for generating an average voltage related to a duty according to an input voltage and the duty, and an on-time controller, for generating a control signal of an on-time related to the duty according to the input voltage and the duty voltage.
    Type: Grant
    Filed: September 4, 2011
    Date of Patent: July 8, 2014
    Assignee: Anpec Electronics Corporation
    Inventors: Chih-Yuan Chen, Liang-Hsiang Chiu
  • Publication number: 20140132239
    Abstract: A novel fully integrated adjustable DC current reference is developed. The reference current is set by the ratio of a DC voltage generated using a band-gap reference and a tuned resistor based on an inductor reference. An AC signal is necessary to develop a relationship between the resistor tuned and the inductor reference. A computation unit which could be designed as an analog circuit is necessary to compute the value of the resistor in relationship to the reference inductor. Classic circuits are used to develop and analyze the relationship between the reference inductor and the tunable resistor that sets the DC current reference. Results show that the value of the inductance is insensitive to process, voltage and temperature variations. Therefore, assuming the DC bandgap reference voltage is insensitive to changes in process, voltage and temperature variations, so is the the DC current reference.
    Type: Application
    Filed: June 23, 2013
    Publication date: May 15, 2014
    Inventor: Bogdan Alexandru Georgescu
  • Patent number: 8704506
    Abstract: An improved start-up (soft-start) circuit for use with voltage regulators, and an improved regulator start-up methodology. For example, an apparatus includes a voltage regulator circuit and a start-up circuit operatively coupled to the voltage regulator circuit. The start-up circuit is configured to provide a current signal, during a start-up period, that generates a reference voltage at a reference input of the voltage regulator circuit such that the reference voltage ramps up at a rate substantially equal to a ramp-up rate of a supply voltage coupled to the start-up circuit and the voltage regulator circuit.
    Type: Grant
    Filed: December 20, 2010
    Date of Patent: April 22, 2014
    Assignee: LSI Corporation
    Inventors: Ronald J. Lipka, Bradley Wright
  • Patent number: 8674671
    Abstract: A constant-voltage power supply circuit includes a first transistor connected between a power supply terminal and an output terminal. The constant-voltage power supply circuit includes a voltage divider circuit including a first resistor having a first end connected to the output terminal and a second resistor having a first end connected to a second end of the first resistor and a second end connected to ground. The constant-voltage power supply circuit includes an output voltage control amplifier that compares the divided voltage and a reference voltage and controls a voltage of a control terminal of the first transistor. The constant-voltage power supply circuit includes a current-limiting characteristic control circuit that controls the voltage of the control terminal of the first transistor according to the divided voltage and an output current.
    Type: Grant
    Filed: March 19, 2012
    Date of Patent: March 18, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yusuke Hikichi, Yutaka Tamura
  • Patent number: 8669752
    Abstract: An apparatus and method are provided for controlling circuit resistance values used for detection of a device in an inline powered system. The system comprises a source device, either a current source or a voltage source, associated with an inline power device. The system also comprises a resistance control circuit comprising a transistor having an emitter, a base and a collector, and a first resistor coupled between the emitter and the collector. In response to the resistance control circuit receiving a relatively low current from the source device, the transistor is configured to be in an off state so that current from the source device flows through the first resistor have a value selected in order to maintain a sufficient resistance during an inline power device detection mode.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: March 11, 2014
    Assignee: Cisco Technology, Inc.
    Inventor: Frederick Roland Schindler
  • Patent number: 8593120
    Abstract: A voltage regulator is capable of continuously and smoothly preventing an inrush current independently of a startup characteristic of a reference voltage circuit. The voltage regulator is provided with an inrush current protection circuit composed of a constant-current circuit, a first transistor having the source thereof connected to the constant-current circuit and the gate thereof controlled by an output voltage detection circuit, a capacitor connected between the first transistor and the gate of an output transistor, a second transistor having the gate thereof connected to the drain of the first transistor and the source thereof connected to a power supply terminal, and a third transistor, which is connected between the second transistor and the output transistor and the gate of which is controlled by the output voltage detection circuit.
    Type: Grant
    Filed: March 29, 2012
    Date of Patent: November 26, 2013
    Assignee: Seiko Instruments Inc.
    Inventor: Socheat Heng
  • Patent number: 8552698
    Abstract: A voltage regulator circuit comprising a first circuit functioning as a voltage dependent resistor, the first circuit having an input coupled to a voltage source and an output and having a resistance dependent on the voltage applied across the circuit by the voltage source such that the resistance increases as the applied voltage increases; and a regulator coupled to the output of the first circuit for providing a regulated output voltage.
    Type: Grant
    Filed: February 28, 2008
    Date of Patent: October 8, 2013
    Assignee: International Rectifier Corporation
    Inventor: Melvin Kit Ho Chow
  • Patent number: 8536852
    Abstract: A current balance circuit includes a first and a second current sensors, an averager, a first and a second control modules, and a first and a second rheostat elements. The first and second current sensors receive a first current and a second current from a power source respectively and convert the first and second currents into a first and a second voltages. The averager receives the first and second voltages and calculates to obtain an average voltage. The first and second control modules receive the first voltage, the second voltage, and the average voltage, to obtain a first and a second control signals, to control current conduction ability of the first and second rheostat elements, to make the first and second currents keep a dynamic balance.
    Type: Grant
    Filed: March 23, 2010
    Date of Patent: September 17, 2013
    Assignee: Hon Hai Precision Industry Co., Ltd.
    Inventors: Tsung-Sheng Huang, Chun-Jen Chen, Duen-Yi Ho
  • Patent number: 8477517
    Abstract: A contact-input circuit for a power system device is described for processing a higher voltage signal from power system equipment or another power system device for use by a lower voltage circuit. The contact-input circuit generally includes a voltage threshold detection device adapted to allow current to flow therefrom when it detects that the higher voltage signal reaches a select threshold. An opto-isolator device, which is coupled to the voltage threshold detection device, provides a voltage signal suitable for use by the lower voltage circuit when the threshold detection device allows the current-flow through the opto-isolator.
    Type: Grant
    Filed: April 21, 2009
    Date of Patent: July 2, 2013
    Assignee: Schweitzer Engineering Laboratories Inc
    Inventor: Milind H. Joshi
  • Patent number: 8471546
    Abstract: To provide a time constant circuit and the like capable of acquiring a characteristic of an output voltage that attenuates gradually after attenuating steeply, compared to a characteristic that attenuates monotonously. The time constant circuit includes: a series/parallel circuit formed by serially connecting a plurality of parallel circuits each formed with a resistance element and a capacitance element between a first terminal and a second terminal; and a voltage-dividing resistance element connected between a third terminal connected to the second terminal and a fourth terminal. A first parallel circuit is formed with a first resistance element and a first capacitance element, a second parallel circuit with a second resistance element and a second capacitance element, and an n-th parallel circuit with an n-th resistance element and an n-th capacitance element. Note that ā€œnā€ is the number of the parallel circuits and it is an integer of 2 or larger.
    Type: Grant
    Filed: September 27, 2010
    Date of Patent: June 25, 2013
    Assignee: NLT Technologies, Ltd.
    Inventor: Kouichi Ooga
  • Patent number: 8467197
    Abstract: Systems and methods are provided for delivering energy from an input interface to an output interface. An electrical system includes an input interface, an output interface, an energy conversion module coupled between the input interface and the output interface, and a control module. The control module determines a duty cycle control value for operating the energy conversion module to produce a desired voltage at the output interface. The control module determines an input power error at the input interface and adjusts the duty cycle control value in a manner that is influenced by the input power error, resulting in a compensated duty cycle control value. The control module operates switching elements of the energy conversion module to deliver energy to the output interface with a duty cycle that is influenced by the compensated duty cycle control value.
    Type: Grant
    Filed: November 8, 2010
    Date of Patent: June 18, 2013
    Assignee: GM Global Technology Operations LLC
    Inventors: Milun Perisic, Ray M. Ransom, Lateef A. Kajouke
  • Patent number: 8412479
    Abstract: Memory power estimation by means of calibrated weights and activity counters are generally presented. In this regard, in one embodiment, a memory power is introduced to read a value from a memory activity counter, to determine a memory power estimation based at least in part on the value and a calibration, and to store the memory power estimation to a register. Other embodiments are also described and claimed.
    Type: Grant
    Filed: June 29, 2010
    Date of Patent: April 2, 2013
    Assignee: Intel Corporation
    Inventors: Howard S. David, Eugene Gorbatov, Ulf R. Hanebutte, Minh Le, Rahul Khanna
  • Patent number: 8400122
    Abstract: This document discusses, among other things, a device for providing a DC output voltage, including a first output voltage and a second output voltage, from an input voltage. The device can include a first voltage regulator configured to provide the first output voltage when the input voltage is below a threshold voltage, and a charge pump configured to provide the second output voltage from the first output voltage in a two-state mode when the input voltage is below the threshold voltage, and to provide the first output voltage and the second output voltage in a three-state mode when the input voltage is above the threshold voltage.
    Type: Grant
    Filed: December 22, 2009
    Date of Patent: March 19, 2013
    Assignee: Fairchild Semiconductor Corporation
    Inventors: Brian Ben North, Cary L. Delano
  • Patent number: 8378657
    Abstract: Circuits and methods for paralleling voltage regulators are provided. Improved current sharing and regulation characteristics are obtained by coupling control terminals of the voltage regulators together which results in precise output voltages and proportional current production. Distributing current generation among multiple paralleled voltage regulators improves heat dissipation and thereby reduces the likelihood that the current produced by the voltage regulators will be temperature limited.
    Type: Grant
    Filed: August 14, 2009
    Date of Patent: February 19, 2013
    Assignee: Linear Technology Corporation
    Inventor: Robert C. Dobkin
  • Patent number: 8325129
    Abstract: A liquid crystal display device includes a back light assembly that emits light on a liquid crystal panel; and an inverter that controls brightness of the light emitted from the back light assembly according to a difference between video data of at least three frames that are sequentially inputted to the liquid crystal panel.
    Type: Grant
    Filed: July 24, 2007
    Date of Patent: December 4, 2012
    Assignee: LG Display Co., Ltd.
    Inventor: Dong Kyoung Oh
  • Patent number: 8314601
    Abstract: As for a transistor, overlapped are factors such as a variation of a gate insulation film which occurs due to a difference of a manufacturing process and a substrate used and a variation of a crystalline state in a channel forming region and thereby, there occurs a variation of a threshold voltage and mobility of a transistor. This invention provides an electric circuit which used a rectification type device in which an electric current is generated only in a single direction, when an electric potential difference was applied to electrodes at both ends of the device. Then, the invention provides an electric circuit which utilized a fact that, when a signal voltage is inputted to one terminal of the rectification type device, an electric potential of the other terminal becomes an electric potential offset only by the threshold voltage of the rectification type device.
    Type: Grant
    Filed: December 16, 2011
    Date of Patent: November 20, 2012
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Hajime Kimura, Yasuko Watanabe
  • Patent number: 8248049
    Abstract: In an NMOSFET-base linear charger, a pair of common gate charging NMOSFET and sensing NMOSFET have their sources coupled together or virtually shorted to each other, so that these two NMOSFETs have a same gate-source voltage and thereby the sensing NMOSFET reflects the drain-source current of the charging NMOSFET on its drain-source current. From the drain-source current of the sensing NMOSFET, a current sensing signal is generated to control the gate voltage of the charging NMOSFET. By implementing the current source with NMOSFETs, the linear charger has smaller die area and less power loss.
    Type: Grant
    Filed: September 30, 2008
    Date of Patent: August 21, 2012
    Assignee: Richtek Technology Corp.
    Inventors: Nien-Hui Kung, Kwan-Jen Chu
  • Patent number: 8218340
    Abstract: A synchronous rectification type DC-DC converter equipped with a burst mode prevents backward flows of currents on the secondary side thereof. The DC-DC converter turns off a control signal of a switching element on the primary side when the load thereof becomes light, and includes a voltage converting transformer, a first switching element connected to the primary side coil of the transformer, a primary side control circuit performing on-off control of the first switching element, a synchronously rectifying second switching element connected to the secondary side coil, and a secondary side control circuit performing on-off control of the second switching element. A pulse width ensuring circuit ensures that the pulse width of the control signal performing on-off control of the first switching element does not become equal to or less than the original width of a PWM pulse when entering the burst mode and when exiting the burst mode.
    Type: Grant
    Filed: June 11, 2008
    Date of Patent: July 10, 2012
    Assignee: Mitsumi Electric Co., Ltd.
    Inventors: Takeshi Sato, Takumi Hyuugaji
  • Patent number: 8217638
    Abstract: A linear regulator and methods of regulation are provided. In one implementation, a linear regulator is provided. The linear regulator can receive an input voltage, generate an internal bias voltage in response to the received input voltage. The linear regulator can determine if the input voltage meets one or more first criteria and second criteria, and adjust an output voltage based on the internal bias voltage if the input voltage meets the one or more first criteria. The linear regulator also can supply the input voltage directly to the load if the input voltage meets the one or more second criteria. In some implementations, the linear regulator can generate an internal bias voltage that is clamped within a desired operating range if the input voltage meets the one or more first criteria, and adjusts one or more electronic circuits using the internal bias voltage to provide the adjusted output voltage.
    Type: Grant
    Filed: August 18, 2010
    Date of Patent: July 10, 2012
    Assignee: Marvell International Ltd.
    Inventors: Ying Tian Li, Sakti P. Rana, Kuong Hoo, legal representative
  • Publication number: 20120139520
    Abstract: The invention relates to a linear regulator comprising input means configured to receive an input voltage, output means configured to deliver an output voltage, a shunt element coupled to said input means and said output means, and configured to be passed through by a current and to exhibit across its terminals a voltage drop independent of said current, controllable by-pass means coupled between said input means and said output means, and configured to have a first state for by-passing said shunt element and a second state for not by-passing said shunt element, and control means coupled to said input means and configured to place said by-pass means in their first state or in their second state depending on the value of said input voltage. The invention also relates to an electronic device comprising such a linear regulator.
    Type: Application
    Filed: April 21, 2010
    Publication date: June 7, 2012
    Applicant: ST-ERICSSON SA
    Inventor: Zhenhua Wang
  • Patent number: 8154270
    Abstract: An input protection circuit (IPC) may prevent an input signal from propagating into a system, such as an integrated circuit (IC), when the voltage level of the input signal exceeds a specified value. The IPC may be configured to compare the input signal voltage, which may be that of an external input signal received by the system, with a reference voltage, which may be the power supply voltage. If the input signal voltage exceeds the reference voltage, the output of the IPC may be set to the value of a specified clamp voltage. If the input signal voltage does not exceed the reference voltage, the output of the IPC may track (or follow) the input signal voltage. For certain integrated circuits, the IPC may be configured to provide circuit protection for an input signal voltage ranging between 0V to 5V, and a power supply voltage ranging between 3.0V and 3.6V.
    Type: Grant
    Filed: February 13, 2009
    Date of Patent: April 10, 2012
    Assignee: Standard Microsystems Corporation
    Inventors: Jane Xu, Steven Burstein, Jay D. Popper
  • Patent number: 8085028
    Abstract: As for a transistor, overlapped are factors such as a variation of a gate insulation film which occurs due to a difference of a manufacturing process and a substrate used and a variation of a crystalline state in a channel forming region and thereby, there occurs a variation of a threshold voltage and mobility of a transistor. This invention provides an electric circuit which used a rectification type device in which an electric current is generated only in a single direction, when an electric potential difference was applied to electrodes at both ends of the device. Then, the invention provides an electric circuit which utilized a fact that, when a signal voltage is inputted to one terminal of the rectification type device, an electric potential of the other terminal becomes an electric potential offset only by the threshold voltage of the rectification type device.
    Type: Grant
    Filed: July 26, 2010
    Date of Patent: December 27, 2011
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Hajime Kimura, Yasuko Watanabe
  • Publication number: 20110273158
    Abstract: A control circuit according to an embodiment of the present invention for a DC-DC converter which has an input, an output and a series connection of a differentiator, a comparator unit, and an integrator. The series connection is coupled in between the input and the output. The comparator unit has an inverting amplifier.
    Type: Application
    Filed: May 5, 2011
    Publication date: November 10, 2011
    Inventors: Loreto Mateu, Markus Pollak, Peter Spies
  • Patent number: 8013587
    Abstract: A power supply circuit includes: an input terminal; a DC voltage converter that converts a DC input voltage supplied to the input terminal into a DC output voltage; an output terminal that outputs the DC output voltage; a bypass circuit provided to the DC voltage converter between the input terminal and the output terminal; and a monitor control unit that monitors whether or not the DC input voltage satisfies a predetermined condition to be processed in the DC voltage converter, so as to connect the input terminal to the output terminal via the bypass circuit if the DC input voltage does not satisfy the predetermined condition.
    Type: Grant
    Filed: August 11, 2008
    Date of Patent: September 6, 2011
    Assignee: Fujitsu Limited
    Inventors: Mitsuo Saeki, Kouichi Matsuda
  • Patent number: 7973567
    Abstract: Power over Ethernet (PoE) communication systems provide power and data communications over the same communications link, where a power source device (PSE) provides DC power (for example, 48 volts DC) to a powered device (PD). The DC power is transmitted simultaneously over the same communications medium with the high speed data from one node to the other node. The PSE typically includes a controller that controls the DC power provided to the PD at the second node of the communications link. The PSE controller measures the voltage, current, and temperature of the outgoing and incoming DC supply lines to characterize the power requirements of the PD. The PSE controller includes a resistorless switch to measure the current. The resistorless switch includes a sense transistor and a current mirror to allowing the PSE controller to calculate the current based upon a replica current.
    Type: Grant
    Filed: July 7, 2010
    Date of Patent: July 5, 2011
    Assignee: Broadcom Corporation
    Inventor: Pieter Vorenkamp
  • Patent number: 7960953
    Abstract: A regulator circuit stabilizes the input voltage applied to an input terminal before outputting the output voltage via an output terminal. An output transistor is provided between the input terminal and the output terminal. An error amplifier adjusts the voltage applied to the control terminal of the output transistor such that a voltage that corresponds to the output voltage approaches a predetermined reference voltage. A fluctuation detection capacitor is provided on a path from the input terminal to the grounded terminal. One terminal of the fluctuation detection capacitor is set to a fixed electric potential. In a case that the input voltage is lower than the voltage at the other terminal of the fluctuation detection capacitor, an undershoot suppressing circuit forcibly reduces the gate voltage of the output transistor.
    Type: Grant
    Filed: December 6, 2006
    Date of Patent: June 14, 2011
    Assignee: Rohm Co., Ltd.
    Inventor: Hiroki Inoue
  • Patent number: 7932705
    Abstract: A variable input voltage regulator includes a first circuit configured to convert a first voltage from a first voltage source to a first current, and a second circuit electrically coupled to the first circuit and configured to mirror the first current to a voltage output node. The variable input voltage regulator further includes a third circuit electrically coupled to the voltage output node of the second circuit and configured to supply additional current to the voltage output node from a second voltage of a second voltage source in response to a control input.
    Type: Grant
    Filed: July 24, 2008
    Date of Patent: April 26, 2011
    Assignee: International Business Machines Corporation
    Inventors: Seongwon Kim, Daniel M. Dreps
  • Publication number: 20110074377
    Abstract: To provide a time constant circuit and the like capable of acquiring a characteristic of an output voltage that attenuates gradually after attenuating steeply, compared to a characteristic that attenuates monotonously. The time constant circuit includes: a series/parallel circuit formed by serially connecting a plurality of parallel circuits each formed with a resistance element and a capacitance element between a first terminal and a second terminal; and a voltage-dividing resistance element connected between a third terminal connected to the second terminal and a fourth terminal. A first parallel circuit is formed with a first resistance element and a first capacitance element, a second parallel circuit with a second resistance element and a second capacitance element, and an n-th parallel circuit with an n-th resistance element and an n-th capacitance element. Note that ā€œnā€ is the number of the parallel circuits and it is an integer of 2 or larger.
    Type: Application
    Filed: September 27, 2010
    Publication date: March 31, 2011
    Applicant: NEC LCD TECHNOLOGIES, LTD.
    Inventor: Kouichi OOGA
  • Patent number: 7911191
    Abstract: A voltage regulator has a device for regulating an output voltage, having an input to receive an input voltage and an output to deliver an output voltage of a constant level, and a device for correcting a drop-out voltage violation, coupled to the device for regulating, to determine an occurrence of a drop-out voltage violation and to cause the device for regulating to change the level of the output voltage upon detection of the drop-out voltage violation. A method for regulating an output voltage has the steps of receiving an input voltage, generating and outputting a regulated output voltage of a constant level, monitoring occurrence of a drop-out voltage violation, and causing a change of the level of the output voltage upon detection of the drop-out voltage violation.
    Type: Grant
    Filed: August 14, 2006
    Date of Patent: March 22, 2011
    Assignee: Infineon Technologies AG
    Inventor: Michael Lewis