With Threshold Detection Patents (Class 323/274)
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Patent number: 9122467Abstract: In one embodiment, the present invention includes a primary voltage regulator to couple a regulated voltage to a processor via a supply line. This regulator includes a multi-phase controller to provide the regulated voltage in multiple phases and to provide a maximum current output sufficient to meet a thermal design power (TDP) of the processor. In addition, an auxiliary voltage regulator may be configured to provide an excess current to the processor via the supply line for a time limited duration, e.g., based on the supply line state. Other embodiments are described and claimed.Type: GrantFiled: March 5, 2013Date of Patent: September 1, 2015Assignee: Intel CorporationInventors: James S. Dinh, Robert D. Wickersham, Daniel Kingsley, Edward L. Payton
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Patent number: 9110644Abstract: In one embodiment, the present invention includes a primary voltage regulator to couple a regulated voltage to a processor via a supply line. This regulator includes a multi-phase controller to provide the regulated voltage in multiple phases and to provide a maximum current output sufficient to meet a thermal design power (TDP) of the processor. In addition, an auxiliary voltage regulator may be configured to provide an excess current to the processor via the supply line for a time limited duration, e.g., based on the supply line state. Other embodiments are described and claimed.Type: GrantFiled: September 14, 2012Date of Patent: August 18, 2015Assignee: Intel CorporationInventors: James S. Dinh, Robert D. Wickersham, Daniel Kingsley, Edward L. Payton
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Patent number: 9069368Abstract: A linear regulator contains an additional AC-coupled feedback loop between the output of the error amplifier and the base of the pass transistor that increases the frequency of the pole at the output of the error amplifier at light load currents to at least partially offset the decreased frequency of the output pole at the lighter load currents. Thus, a desired phase margin is preserved. The AC-coupled feedback loop includes a bipolar feedback transistor connected in parallel with the pass transistor. A resistor is connected to the emitter of the feedback transistor to reduce the relative gain of the feedback transistor above light load currents. A feedback capacitor Cfb is connected between the collector of the feedback transistor and the output of the error amplifier. The negative AC feedback increases the pole frequency at the output of the error amplifier and the base of the pass transistor.Type: GrantFiled: July 19, 2013Date of Patent: June 30, 2015Assignee: Linear Technology CorporationInventor: Amitkumar Pravin Patel
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Patent number: 9054581Abstract: A switched mode power supply (SMPS) controller is disclosed. The controller comprises a monitoring circuit adapted to monitor the rate of change of a voltage at an input (1) and to monitor the drop in voltage at the input (1) from a peak value. The controller is adapted to generate a signal for closing the switch when the monitored rate of change falls below a first predetermined threshold and the monitored drop in voltage exceeds a second predetermined threshold.Type: GrantFiled: March 28, 2012Date of Patent: June 9, 2015Assignee: NXP B.V.Inventor: Wilhelmus Hinderikus Maria Langeslag
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Patent number: 9041313Abstract: A ballast circuit for a Light Emitting Diode (LED) has a regulator element coupled to the LED and to an input voltage source. A control circuit is coupled to the LED and to an input voltage source. A first switching device is coupled in series with the regulator element. A second switching device is coupled to the input voltage and the control circuit.Type: GrantFiled: April 26, 2013Date of Patent: May 26, 2015Assignee: Microchip Technology Inc.Inventor: Alexander Mednik
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Patent number: 9041368Abstract: A power supply device includes a first converter which converts an input voltage to a first voltage, a second converter which converts the first voltage from the first converter to a second voltage, a voltage comparison section which compares the first voltage outputted from the first converter with a predetermined reference voltage, a voltage comparison result output section which outputs a first signal until the first voltage is determined to be higher than the predetermined reference voltage by the voltage comparison section and retains a second signal as an output after the first voltage is determined to be higher than the predetermined reference voltage, and a converter control section which controls the second converter to stop when the first signal is outputted from the voltage comparison result output section and controls the second converter to operate when the second signal is outputted from the voltage comparison result output section.Type: GrantFiled: July 1, 2013Date of Patent: May 26, 2015Assignee: OLYMPUS CORPORATIONInventor: Toshiro Ijichi
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Patent number: 9035631Abstract: The phase margin compensation method according to an exemplary embodiment of the present invention includes: outputting reference voltage (Vout2); outputting a first reference voltage (Vout1) actually supplied to the target circuit; comparing the reference voltage (Vout2) with the first reference voltage (Vout1) by the comparator; counting any section of an output signal (pulse signal) from the comparator by a predetermined frequency by the duty cycle calculator; and controlling a phase margin of a frequency of output voltage supplied to the target circuit by controlling buffer current based on the duty cycle ratios and the output bit information fed back from the duty cycle calculator.Type: GrantFiled: March 14, 2013Date of Patent: May 19, 2015Assignee: SAMSUNG ELECTRO-MECHANICS CO., LTD.Inventor: Soo Woong Lee
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Patent number: 9035583Abstract: The system has a driving circuit for the motor of the electric fan, coupled to the electrical system of a motor vehicle and having a plurality of controlled electronic switches, and an electronic control unit arranged to control the driving circuit in such a way as to cause the flow in the motor of a variable average current capable of producing a required speed of rotation, in accordance with a predetermined relationship or function. The control unit is designed to store a predetermined threshold of rotation speed, and to control the motor through the associated driving circuit in such a way that when the rotational speed of the motor exceeds the threshold the driving circuit causes electrical braking of the motor.Type: GrantFiled: December 13, 2011Date of Patent: May 19, 2015Assignee: GATE S.R.L.Inventors: Davide Cerrato, Pierfranco Pangella
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Publication number: 20150130433Abstract: Load switch supply circuits and methods are provided that allow a load switch to maintain power delivery without having the load switch encounter thermal or power overload conditions. In an example, a load switch supply circuit can include a multiplier circuit configured to receive a first representation of voltage across a load switch and a representation of current provided by the load switch and to provide a representation of power dissipated by the load switch, and a control amplifier configured to compare the representation of power dissipated by the load switch to a power threshold and to adjust a control terminal of the load switch to avoid cycling the load switch to an off state due to thermal overload or power overload conditions.Type: ApplicationFiled: November 7, 2014Publication date: May 14, 2015Inventors: Hrvoje Jasa, Steven Macaluso
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Patent number: 9030176Abstract: A semiconductor integrated circuit includes a plurality of output transistors each controlling the magnitude of an output voltage relative to the magnitude of a load current according to a control value indicated by an impedance control signal applied to a control terminal, a voltage monitor circuit outputting an output voltage monitor value indicating a voltage value of the output voltage, and a control circuit controlling the magnitude of the control value according to the magnitude of an error value between a reference voltage indicating a target value of the output voltage and the output voltage monitor value, and controls based on the control value whether any of such transistors be brought to a conducting state. The control circuit increases a change step of the control value relative to the error value during a predetermined period according to prenotification signals for notifying a change of the load current in advance.Type: GrantFiled: November 12, 2012Date of Patent: May 12, 2015Assignee: Renesas Electronics CorporationInventors: Masafumi Onouchi, Kazuo Otsuga, Yasuto Igarashi, Sadayuki Morita, Koichiro Ishibashi, Kazumasa Yanagisawa
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Patent number: 9024477Abstract: A high voltage power source device includes piezoelectric transformers, each of the piezoelectric transformers being formed with a primary electrode and a secondary electrode on piezoelectric ceramics, receiving a primary voltage at the primary electrode, and generating a second voltage from the secondary electrode, switching elements, each of the switching elements driving a respective one of the piezoelectric transformers, and primary voltage supply devices, each of the primary voltage supply devices supplying the primary voltage to the primary electrode of the respective one of the piezoelectric transformers by driving the respective one of the switching elements when the secondary voltage is generated from the respective one of the second electrodes, wherein the respective one of the primary voltage supply devices supplies the primary voltage to the respective one of the primary electrodes by driving the respective one of the switching elements at the same frequency.Type: GrantFiled: February 16, 2012Date of Patent: May 5, 2015Assignee: Oki Data CorporationInventor: Ryo Takatsuka
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Patent number: 9014840Abstract: A cargo loading system for a cargo compartment of a means of transport, for example a cargo aircraft or a passenger aircraft, is provided. The system includes at least one power drive unit for transporting cargo of the means of transport. The power drive unit and a control module are coupled to a BUS system. The control module generates control signals for the power drive unit and maintenance data of the power drive unit for the control and maintenance of the power drive unit. The BUS system transmits the control signals and maintenance data of the power drive unit between the control module and the power drive unit. In this manner an existing hardware platform of the means of transport can be used, and weight and cabling as well as the number of control boxes of the means of transport can be reduced.Type: GrantFiled: February 6, 2013Date of Patent: April 21, 2015Assignee: Airbus Operations GmbHInventors: Sven Scherenberger, Bernd Schnoerwangen
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Patent number: 8981746Abstract: A low-dropout linear regulator includes an error amplifier which includes a cascaded arrangement of a differential amplifier and a gain stage. The gain stage includes a transistor driven by the differential amplifier to produce at a drive signal for an output stage of the regulator. The transistor is interposed over its source-drain line between a first resistive load included in a RC network creating a zero in the open loop gain of the regulator, and a second resistive load to produce a drive signal for the output stage of the regulator. The second resistive load is a non-linear compensation element to render current consumption linearly proportional to the load current to the regulator. The first resistive load is a non-linear element causing the frequency of said zero created by the RC network to decrease as the load current of the regulator decreases.Type: GrantFiled: March 15, 2012Date of Patent: March 17, 2015Assignee: STMicroelectronics Design and Application S.R.O.Inventor: Karel Napravnik
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Patent number: 8981745Abstract: A bypass low dropout regulator has a pass gate coupled to a voltage rail. The pass gate receives a pass gate control signal on a pass gate control line and controllably drops a voltage from a rail to a regulated output in accordance with the pass gate control signal. A differential amplifier generates the pass gate control voltage using a reference and feedback from the regulated output. A bypass switch selectively bypasses the regulator control signal, in response to a bypass signal, by placing a pass gate ON voltage on the pass gate control line. Optionally, and ON-OFF mode circuit selectively disables the pass gate in response to a system ON-OFF signal.Type: GrantFiled: March 7, 2013Date of Patent: March 17, 2015Assignee: QUALCOMM IncorporatedInventors: Burt L. Price, Dhaval R. Shah, Yeshwant Nagaraj Kolla
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Patent number: 8975882Abstract: A regulating circuit includes a first comparator configured to control a turning on and a turning off of a first transistor based on a first comparison a reference voltage to a feedback voltage. The first transistor is coupled between an output node and a first voltage supply. A second comparator is configured to control a turning on and a turning off of a second transistor based on a second comparison of the reference voltage to the feedback voltage. The second transistor is coupled to the output node. A high-impedance circuit is coupled in series with the second transistor such that the high-impedance block is disposed between the second transistor and a second power supply. The high-impedance circuit is configured to generate a constant current between the output node and the second voltage supply when the second transistor is turned on.Type: GrantFiled: October 31, 2012Date of Patent: March 10, 2015Assignee: Taiwan Semiconductor Manufacturing Co., Ltd.Inventor: Chih-Feng Li
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Publication number: 20150061757Abstract: A low dropout linear regulator, a starting method, an electronic device, and a chip are provided. The starting method includes the steps of beginning a soft-starting process of the low dropout linear regulator and providing a first current; when an output voltage of the low dropout linear regulator reaches a starting voltage, providing a second current; and dynamically adjusting a threshold of an over current during the soft-starting process of the low dropout linear regulator, wherein the over current includes at least one of the first current and the second current. Through the low dropout linear regulator, the starting method, the electronic device, and the chip, there is short starting time and less overshoot of the output voltage, thereby achieving a fast and safe starting process. Moreover, the circuit is protected, and the usage quality and life is enhanced.Type: ApplicationFiled: August 28, 2014Publication date: March 5, 2015Inventors: Jun-Yan GUO, Hong-Sing KAO
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Publication number: 20150061390Abstract: A power supply, comprising a constant-current power supply, and at least two current-limiting protection branches (I1, . . . , In) connected in parallel on the output loop of the constant-current power supply, the current limiting protection branches comprising at least one load (L1, . . . , Lnn) and current-limiting protector (l0, . . . , ln), and the designed current limiting value of the current-limiting protector in each branch being greater than the designed working current value of the current-limiting protection branch where the current-limiting protector is located.Type: ApplicationFiled: March 7, 2013Publication date: March 5, 2015Applicant: Shenzhen Gpoint Tech Company LimitedInventors: Hongzhi Zhang, Yongxian Xie
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Publication number: 20150042300Abstract: A voltage regulator includes an input terminal, an output terminal, a control circuitry, a buck mode switching converter, and a low dropout regulator circuit. The buck mode switching converter is arranged to convert a voltage signal received at the input terminal to a first voltage signal at the output terminal responsive to a first predetermined signal output from the control circuitry. The buck mode switching converter includes an electronically controlled switch in communication with an energy storage element. The low dropout regulator circuit is coupled between the input terminal and the output terminal and includes a linear circuit and is arranged to control a voltage drop across the linear circuit so as to provide a second voltage signal at the output terminal responsive to a second predetermined signal output from the control circuitry.Type: ApplicationFiled: August 7, 2014Publication date: February 12, 2015Inventors: Arkadiy Peker, Bernard Drexler, Tamir Reshef, Reghu Rajan
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Patent number: 8947031Abstract: A method for operating a direct current (DC) motor is shown and described. The method includes using pulse width modulated (PWM) DC output to control the speed of the DC motor. The method further includes sensing current output to the motor. When the sensed current exceeds a threshold, the method holds the PWM DC output off.Type: GrantFiled: June 26, 2012Date of Patent: February 3, 2015Assignee: Johnson Controls Technology CompanyInventors: Russell W. Diamond, Gary A. Romanowich, David R. Fuhr
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Patent number: 8947895Abstract: A system including a switch configured to supply power to a load. A first comparator is configured to compare a first current through the switch to a first threshold. A second comparator is configured to compare the first current through the switch to a second threshold. The second threshold is greater than the first threshold. A current control module is configured to turn off the switch (i) for a first duration in response to the first current through the switch being greater than or equal to the first threshold and (ii) for a second duration in response to the first current through the switch being greater than or equal to the second threshold. The current control module is configured to adjust the second duration based on a difference between an estimated current through the load and a desired current through the load.Type: GrantFiled: February 24, 2012Date of Patent: February 3, 2015Assignee: Marvell World Trade Ltd.Inventors: Jinho Choi, Hao Peng, Wanfeng Zhang, Tuyen Doan
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Patent number: 8937465Abstract: Systems and methods for actively reducing or eliminating conducted noise from power provided to DC circuits include a current sensor, a boost converter, a buck converter, and energy supply capacitors. The current sensor senses the input current provided by the power source. The boost converter increases the voltage level above that provided by the power source while maintaining current at or near the level sensed by the current sensor, and while also maintaining a charge on the energy supply capacitors. The buck converter is powered by the output from the boost converter and provides an output voltage to a load. The operation of the boost converter and the buck converter may be controlled to maintain a continuous and low ripple current from the power source and to maintain a continuous and low ripple voltage to the load.Type: GrantFiled: February 11, 2011Date of Patent: January 20, 2015Assignee: Alcatel LucentInventor: Jean-Philippe Fricker
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Patent number: 8922179Abstract: A low dropout (LDO) voltage regulator includes a voltage regulation loop for providing a gate drive signal to an output device, the gate drive signal proportional to an output current. The voltage regulation loop includes a current bias input for receiving a bias current. The LDO voltage regulator further includes a current bias control circuit for providing the adaptive bias current at a first value that is proportional to current limit value lab and the width-to-length ratio of transistors of the transconductance amplifier when the output current less than or equal to a threshold and increases the bias current from a threshold to a current limit value. The output current varies substantially linearly over a range of output current values between the threshold and the current limit value.Type: GrantFiled: December 12, 2011Date of Patent: December 30, 2014Assignee: Semiconductor Components Industries, LLCInventor: Petr Kadanka
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Patent number: 8922176Abstract: An apparatus is configured to provide a voltage rising at the output with a programmable slew rate. The apparatus comprises a ramp-up control circuit module for supplying an increasing output voltage that is output to a load circuit. The ramp-up control circuit comprises an amplifier that receives the output of a plurality of selectable mirrored current sources that build up voltage across a capacitor for programming a selected linear slew rate for the increasing output voltage. The apparatus further comprises a glitch filter circuit for stabilizing the increasing output voltage so as to minimize glitches, including current and voltage stress, in the output voltage.Type: GrantFiled: March 1, 2012Date of Patent: December 30, 2014Assignee: SanDisk Technologies Inc.Inventors: Alexander Tetelbaum, Tomer Shaul Elran
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Patent number: 8901898Abstract: 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: GrantFiled: November 14, 2011Date of Patent: December 2, 2014Assignee: Dell Products L.P.Inventors: So-Yu Weng, Wen-Hung Huang, Yung Fa Chueh
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Patent number: 8890498Abstract: A driving circuit in which, during an on-period of a switching element, a voltage applied to the switching element is stored, and during an off-period of the switching element, the stored voltage is supplied to turn off the switching element.Type: GrantFiled: June 17, 2010Date of Patent: November 18, 2014Assignee: Canon Kabushiki KaishaInventor: Shinichiro Matsumoto
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Patent number: 8866460Abstract: A power supply uses a power converter to generate a regulated voltage by referencing to a first DC voltage, a low dropout (LDO) regulator to generate an output voltage from the regulated voltage by referencing to a second DC voltage, and a reference voltage generator to dynamically adjust the first DC voltage according to the input voltage and the control voltage of the output transistor of the LDO regulator. The dropout voltage of the LDO regulator can be minimized to maintain the high efficiency of the power supply at different loading or selected output voltages.Type: GrantFiled: September 10, 2012Date of Patent: October 21, 2014Assignee: Richtek Technology Corp.Inventors: Tsung-Wei Huang, Shui-Mu Lin
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Patent number: 8860358Abstract: A method includes searching for a point of maximum power based on a systematic load variation, setting the point of maximum power as the operating point of the photovoltaic generator, and tracking the operating point based on a load variation with a narrow variation range. The method also includes analyzing operating variables of the photovoltaic generator to determine the level of probability that the operating point deviates from the point of maximum power, selectively interrupting the tracking and carrying out another search to determine the point of maximum power as a function of the analysis of the operating variables, and setting the point of maximum power as the operating point, and resuming the tracking. The method further takes into account previous searches carried out in the presence of comparable operating variables to determine the probability.Type: GrantFiled: January 24, 2013Date of Patent: October 14, 2014Assignee: SMA Solar Technology AGInventors: Gerd Bettenwort, Jens Klein, Markus Hopf
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Publication number: 20140285165Abstract: A low-dropout voltage regulator apparatus includes a voltage source circuit, an error amplifier, an output transistor, a resistor-capacitor circuit, a detection circuit, and a current adjusting circuit. The voltage source circuit generates a reference voltage signal and at least one threshold voltage signal. The error amplifier receives the reference voltage signal and a feedback voltage signal to generate an output control signal. The output transistor provides an output current for the output terminal according to the output control signal. The resistor-capacitor circuit generates the feedback voltage signal using voltage dividing according to a voltage corresponding to the output current. The detection circuit compares at least one threshold voltage signal with the output voltage to generate at least one control voltage signal.Type: ApplicationFiled: March 12, 2014Publication date: September 25, 2014Applicant: Silicon Motion Inc.Inventors: Tsun-Hsin Wang, Chiao-Hsing Wang
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Patent number: 8843180Abstract: Embodiments for at methods, apparatus and systems for operating a voltage regulator are disclosed. One apparatus includes a switching voltage regulator, wherein the switching voltage regulator includes a series switch element, a shunt switch element, a switching controller and a switched output filter. The switching controller is configured to generate a switching voltage through controlled closing and opening of the series switch element and the shunt switch element. The switched output filter filters the switching voltage and generates a regulated output voltage, wherein the switched output filter includes a plurality of capacitors that are selectively included within the switched output filter.Type: GrantFiled: June 5, 2013Date of Patent: September 23, 2014Assignee: R2 Semiconductor, Inc.Inventors: James E. C. Brown, Daniel Dobkin, Pablo Moreno Galbis, Cory Severson, Lawrence M. Burns
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Publication number: 20140266103Abstract: Techniques are described that embed a digital assisted regulator with an LDO regulator on a chip without requiring a capacitor external to the chip and to regulate a voltage without undershoot. The digital assisted regulator responds to information regarding operation of the LDO regulator and to a signal that provides advance notification of a load change. When the advance notification signal is received, the digital assisted regulator pulls a circuit's supply voltage up to a chip's incoming supply voltage. When the correct operating voltage has been reached and any undershoot problem removed, the digital assisted regulator balances the current it provides with the current provided by the LDO regulator, to allow a quick response time for other load changes. Also, bandwidth of an LDO regulator may be expanded by use of an advance notice signal to increase bias current of an LDO output device to meet an upcoming load change.Type: ApplicationFiled: March 15, 2013Publication date: September 18, 2014Applicant: QUALCOMM INCORPORATEDInventors: Yuhe Wang, Marzio Pedrali-Noy, Xuhao Huang, Martin Saint-Laurent, Xufeng Chen
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Patent number: 8836303Abstract: An active leakage consuming module (1001) is to be added to an LDO regulator without modification of the structure of this latter. The module provides a low-power operating mode with reduced current consumption, without impairing an operation of the LDO regulator for higher currents output by said LDO regulator. The module comprises a leakage current path (54) and control means (40, 50) for conducting consumed current below a threshold out of a pull-down path of the LDO regulator.Type: GrantFiled: December 13, 2011Date of Patent: September 16, 2014Assignee: ST-Ericsson SAInventors: Karel Nápravnik, Alexandre Pons
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Patent number: 8836302Abstract: A low dropout voltage regulator is provided. The low dropout voltage regulator includes a comparison unit, a buck unit, a feedback unit and a current-drawing unit. The comparison unit is used for receiving a reference voltage and a feedback voltage, and comparing the reference voltage and the feedback voltage to output a first voltage. The buck unit is used for receiving an input voltage and the first voltage and transferring the input voltage to a output voltage. The feedback unit is used for receiving the output voltage, and converting the output voltage to a feedback voltage, and then transmitting the feedback voltage to the comparison unit. The current-drawing unit determines whether to draw a portion of a first current generated by the buck unit, so as to stabilize the output voltage.Type: GrantFiled: September 15, 2012Date of Patent: September 16, 2014Assignee: ISSC Technologies Corp.Inventor: Yi-Lung Chen
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Patent number: 8810219Abstract: A voltage regulator having good transient response characteristics and maintaining stable operation is provided. The voltage regulator includes: a first MOS transistor having a gate terminal connected to an output terminal of the differential amplifier circuit; a first constant current source provided between the first MOS transistor and a ground terminal; an output MOS transistor having a gate terminal connected to a drain terminal of the first MOS transistor via a phase compensation circuit; a second MOS transistor having a gate terminal to which an output of the differential amplifier circuit is input and a drain terminal connected to the gate terminal of the output MOS transistor; and a second constant current source provided between the second MOS transistor and a ground terminal.Type: GrantFiled: September 7, 2012Date of Patent: August 19, 2014Assignee: Seiko Instruments Inc.Inventor: Teruo Suzuki
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Patent number: 8803493Abstract: The invention relates to a voltage regulator having a differentiating circuit and an amplifier, the differentiating circuit being designed to detect a voltage at the voltage regulator connection and to provide it as a differentiated signal at its differentiating output, and the amplifier being designed to inject a compensation signal dependent on the differentiated signal into an input connection of an output circuit of the voltage regulator.Type: GrantFiled: May 13, 2011Date of Patent: August 12, 2014Assignee: Infineon Technologies Austria AGInventors: Cristi Zegheru, Michael Lenz
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Patent number: 8803769Abstract: A DC-DC converter generates a first power and a second power for driving pixels in an organic light emitting display, such that the voltages of the first power and the second power are substantially independent of the voltage from a power supply or a battery. A voltage detector detects the voltage from the power supply, and a booster circuit and an inverter circuit respectively boost and invert the voltage from the power supply to generate and output the first and the second powers, respectively, for the pixels. A PWM controller controls the booster circuit and the inverter circuit to control voltages of the first power and the second power. The booster circuit is adapted to reduce the voltage from the power supply to be lower than the voltage of the first power when the voltage from the power supply detected by the voltage detector is higher than a reference voltage.Type: GrantFiled: November 24, 2009Date of Patent: August 12, 2014Assignee: Samsung Display Co., Ltd.Inventors: Sung-Cheon Park, Su-Yeon Yun
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Patent number: 8797008Abstract: Representative implementations of devices and techniques control regulator output overshoot. An offset signal is provided to a component of the regulator during at least a portion of the regulator start-up.Type: GrantFiled: January 6, 2012Date of Patent: August 5, 2014Assignee: Infineon Technologies AGInventor: Sachin Devegowda
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Publication number: 20140210439Abstract: The present invention discloses a switching regulator and a control circuit thereof. The switching regulator includes a boost or buck-boost power stage, a first operation circuit and a bypass circuit. The power stage controls at least one power transistor switch included therein according to a first operation signal, to convert an input voltage to an output voltage at an output terminal. The first operation circuit generates the first operation signal in response to the output voltage or a related signal thereof. The bypass circuit includes a bypass transistor and a second operation circuit. When it is required to provide power to the output terminal promptly, the second operation circuit turns ON the bypass transistor, and when the input voltage is equal to the output voltage or equal to a sum of the output voltage plus a safety offset value, the second operation circuit turns OFF the bypass transistor.Type: ApplicationFiled: January 29, 2013Publication date: July 31, 2014Inventors: Tzu-Huan Chiu, Chung-Lung Pai, Hung-Yu Cheng, Shuo-Wen Chang
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Patent number: 8791674Abstract: A voltage regulator receives an unregulated DC input voltage supply and provides a regulated DC output voltage. A primary pass element and an external resistor are located in a primary current path through which a load current flows from the input terminal to the output terminal. The voltage regulator includes two control circuits that control the impedances of two pass elements. Power dissipation can be improved and the dropout voltage can be reduced by maintaining the voltage on an internal node of the voltage regulator.Type: GrantFiled: July 16, 2010Date of Patent: July 29, 2014Assignee: Analog Devices, Inc.Inventor: Brian Moane
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Patent number: 8779748Abstract: An error amplification circuit includes an integrated circuit and a phase compensation capacitor. The integrated circuit includes an error amplifier to amplify a difference between a predetermined reference voltage and an input feedback voltage for output; a current generator circuit to generate a bias current for supply to the error amplifier; a phase compensation resistor; a bias-current control terminal; and a phase compensation terminal connected to an output terminal of the error amplifier via the phase compensation resistor. The phase compensation capacitor is connected to the phase compensation terminal, the phase compensation capacitor being provided outside the integrated circuit.Type: GrantFiled: January 12, 2012Date of Patent: July 15, 2014Assignee: Ricoh Company, Ltd.Inventor: Takashi Gotoh
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Patent number: 8773096Abstract: A voltage regulator includes an amplifier to generate a difference voltage responsive to a comparison of a reference voltage and a feedback voltage. An output driver is coupled to the amplifier and drives a regulated output voltage responsive to the difference voltage. An impedance circuit is coupled between the output driver and a low power source and establishes the feedback voltage responsive to a current through the impedance circuit. A variation detector is operably coupled between the regulated output voltage and the difference voltage and is configured to modify the difference voltage. In some embodiments, the difference voltage is modified responsive to a rapid change of the regulated output voltage capacitively coupled to the variation detector. In other embodiments, the difference voltage is modified responsive to a rapid change of the feedback voltage capacitively coupled to the variation detector.Type: GrantFiled: March 29, 2012Date of Patent: July 8, 2014Assignee: Integrated Device Technology, inc.Inventors: Shawn Wang, Yumin Zhang, Jeffrey G. Barrow
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Publication number: 20140184183Abstract: A semiconductor device includes: an output transistor; and a current detection section. The output transistor controls electric power supply from an electric power source to a load. The current detection section detects a current flowing through the output transistor. The current detection section has a current detection characteristic in which a current detection value has approximately linier and negative dependence on a drain-source voltage of the output transistor.Type: ApplicationFiled: December 20, 2013Publication date: July 3, 2014Applicant: Renesas Electronics CorporationInventors: Makoto Tanaka, Akihiro Nakahara
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Publication number: 20140184184Abstract: A voltage detecting circuit including: a first current source including a first terminal connected to a first voltage input terminal; a second current source including a first terminal connected to ground potential VSS; and a first transistor including a first main terminal connected to a second terminal of the first current source, a second main terminal connected to a second terminal of the second current source and a detection output terminal, and a control terminal connected to a second voltage terminal. The first and the second current sources are configured such that a logic level of a detection output signal is determined based on whether one voltage applied to the first voltage terminal is higher or lower than a voltage obtained by adding a voltage of a difference between the first main terminal and control terminal of the first transistor to the other voltage applied to the second voltage terminal.Type: ApplicationFiled: March 6, 2014Publication date: July 3, 2014Applicant: PANASONIC CORPORATIONInventors: Hiroshi YAJIMA, Hideyuki KIHARA, Takahiro UEHARA
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Patent number: 8760097Abstract: A voltage control operation unit receives, from a subtraction unit, a value obtained by subtracting a detection value of a voltage from a voltage command value, and performs a control operation for setting the voltage to be equal to the voltage command value. The voltage control operation unit outputs the calculated control amount as a current command value. A current control operation unit receives, from a subtraction unit, a value obtained by subtracting a detection value of a current from a current command value, and performs a control operation for setting the current to be equal to the current command value. A driving signal generation unit generates a signal for driving a boost converter based on a duty command value received from the current control operation unit.Type: GrantFiled: May 27, 2009Date of Patent: June 24, 2014Assignee: Toyota Jidosha Kabushiki KaishaInventors: Naoyoshi Takamatsu, Masaki Okamura, Daigo Nobe
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Patent number: 8760132Abstract: Disclosed is an output stage, and associated apparatus, for a voltage regulator that includes a clamp circuit that is operable to ensure that the output voltage recovers quickly, i.e. that the perturbation of this voltage is limited and remains within a given specification, when entering a standby mode and which is controlled in a supply independent manner.Type: GrantFiled: June 24, 2010Date of Patent: June 24, 2014Assignee: STMicroelectronics (Research & Development) LimitedInventor: Dayananda Kumar Rasaratnam
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Patent number: 8729876Abstract: A voltage regulator includes: a first comparator for comparing a first reference voltage with a feedback voltage to generate a first comparing result accordingly; a first transistor for controlling an output voltage at an output node in response to the first comparing result; a second transistor for adjusting the output voltage at the output node in response to a control signal; a feedback block, for providing the feedback voltage according to the output voltage; and a control block, for receiving the output voltage and providing the control signal according to the output voltage.Type: GrantFiled: January 24, 2010Date of Patent: May 20, 2014Assignee: Himax Technologies LimitedInventor: Chia-Jui Shen
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Patent number: 8729875Abstract: A method and circuit for controlling the delivery of power having a current component to a load having an inductive component, the method comprising selectively switching power to the load with a switch, wherein the switch is caused to operate at the threshold of saturation during a conduction state such that the switch self commutates to its off state when the magnitude of the current through the load is substantially zero. The method and circuit may be used in a number of applications for detecting a current zero crossing and may be applied to circuits such as dimmer circuits.Type: GrantFiled: December 12, 2006Date of Patent: May 20, 2014Assignee: Clipsal Australia Pty LtdInventor: James Robert Vanderzon
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Patent number: 8725218Abstract: Embodiments for at methods, apparatus and systems for operating a voltage regulator are disclosed. One method includes generating, by a switching controller, a switching voltage through controlled closing and opening of a series switch element and a shunt switch element. Further, the method includes generating, by a switchable output filter, a regulated output voltage by filtering the switching voltage, wherein the switchable output filter comprises a plurality of capacitors that are selectively included within the switchable output filter.Type: GrantFiled: February 18, 2012Date of Patent: May 13, 2014Assignee: R2 Semiconductor, Inc.Inventors: James E. C. Brown, Daniel Dobkin, Pablo Moreno Galbis, Cory Severson, Lawrence M. Burns
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Patent number: 8716993Abstract: A low dropout (LDO) regulator includes a voltage regulation loop for providing an output voltage to an output terminal, where the output voltage is proportional to a reference voltage. The voltage regulation loop includes a current bias input for receiving a bias current. The LDO regulator also includes a bias current control circuit for providing the bias current at a first value when the reference voltage is greater than a feedback voltage and at a second value higher than the first value when the reference voltage is less than the feedback voltage.Type: GrantFiled: November 8, 2011Date of Patent: May 6, 2014Assignee: Semiconductor Components Industries, LLCInventor: Petr Kadanka
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Patent number: 8716994Abstract: Techniques and circuits are described by which analog circuits may be quickly driven to desired states at startup in a fast and accurate manner.Type: GrantFiled: July 18, 2012Date of Patent: May 6, 2014Assignee: SanDisk Technologies Inc.Inventors: Ekram H. Bhuiyan, Steve X. Chi
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Publication number: 20140117956Abstract: A transient response accelerated (TRA) low dropout (LDO) regulator has an error amplifier having a feedback input, and a reference input configured to receive a reference voltage, and an output that controls a pass gate. The pass gate output voltage is applied to the feedback input. A transient response accelerator (TRA) circuit detects a rapid voltage drop on the pass gate output and, in response, applies a pulse control that rapidly lowers the resistance of the pass gate.Type: ApplicationFiled: March 7, 2013Publication date: May 1, 2014Applicant: QUALCOMM INCORPORATEDInventors: Burt L. Price, Dhaval R. Shah, Yeshwant Nagaraj Kolla