Inrush Current Limiters Patents (Class 323/908)
  • Patent number: 10340787
    Abstract: A power factor correction (PFC) stage of a power supply unit has a PFC circuit including a rectifier circuit, a PFC controller circuit with a PFC switch, a current sensor connected to the PFC switch, a high frequency bypass capacitor connected between the PFC controller circuit and the rectifier circuit, and a bulk storage capacitor connected between the PFC controller circuit and an output of the PFC stage. The PFC stage also has a negative temperature coefficient thermistor connected in series with the PFC switch and the current sensor. During a start-up of the power supply unit, the PFC controller circuit causes the PFC switch to turn-on until the PFC controller circuit causes the PFC switch to turn-off after a current through the current sensor is sensed as being equal to or greater than a preset value.
    Type: Grant
    Filed: April 17, 2015
    Date of Patent: July 2, 2019
    Assignee: Astec International Limited
    Inventors: Jun Liu, Qingfeng Liu, Zhaotu Fan, Zhe Li
  • Patent number: 10168721
    Abstract: A method of detecting and disabling a failed power supply in a redundant power supply system is disclosed. The method includes detecting, via a first controller, an output voltage and an output current of a first power supply providing power to the redundant power supply system. The first controller determines if the output voltage is greater than a maximum output voltage threshold and in response to determining that the output voltage is greater than the maximum output voltage threshold, the first controller determines if the output current is equal to zero. In response to determining that the output current is not equal to zero and not less than a common share bus current, the first power supply is disabled such that the first power supply does not provide power to the power supply system.
    Type: Grant
    Filed: November 2, 2015
    Date of Patent: January 1, 2019
    Assignee: Dell Products, L.P.
    Inventors: Mark A. Muccini, Stuart A. Berke, Lei Wang
  • Patent number: 10090830
    Abstract: An apparatus and methods of breaking a circuit using a switch are disclosed. In an example, a variable voltage is applied across a switch, which comprises a series connection of switching elements which are individually controllable between a blocking state and a conductive state. The state of the switching elements is controlled such that at least a portion of switching elements are in the blocking state, and fewer switching elements are in the blocking state when the applied voltage magnitude is low than when the applied voltage magnitude is high.
    Type: Grant
    Filed: February 11, 2016
    Date of Patent: October 2, 2018
    Assignee: GENERAL ELECTRIC TECHNOLOGY GMBH
    Inventors: Konstantin Vershinin, Jonathan Nicholls
  • Patent number: 9998033
    Abstract: A stacked voltage source inverter having separate DC sources is described herein. This inverter is applicable to low or medium voltage, low to medium power applications such as photovoltaic utility interface systems, battery storage application such as peak shaving with renewables, motor drive applications and for electric vehicle drive systems. The stacked inverter consists of at least one phase wherein each phase has a plurality of low voltage full bridge inverters equipped with an independent DC source. This inverter develops a near sinusoidal approximation voltage waveform with fast switching and small low pass AC output filter. A system controller controls operating parameters for each inverter. The inverter may have either single-phase or multi-phase embodiments connected in either wye or delta configurations.
    Type: Grant
    Filed: March 25, 2015
    Date of Patent: June 12, 2018
    Assignee: Empower Micro Systems Inc.
    Inventors: Milan Ilic, Mika Nuotio
  • Patent number: 9859786
    Abstract: A boost PFC converter includes a rectifier, a converter and an output stage comprising an output capacitor where the DC output voltage is provided across the output capacitor. The rectifier includes four rectifying elements connected in a full bridge configuration where the upper two of these four rectifying elements are thyristors and where the lower two are diodes. In that the thyristors are controlled such as to be open for only a part of each half period of the input voltage, the amount of current per half period that is passed to the output capacitor is controllable and can be made very small. Accordingly, the charge current for precharging the output capacitor can be controllably limited such that a bulky precharge resistor is not required anymore to avoid high inrush currents.
    Type: Grant
    Filed: November 7, 2014
    Date of Patent: January 2, 2018
    Assignee: DET INTERNATIONAL HOLDING LIMITED
    Inventors: Michael Hufnagel, Frank Schafmeister
  • Patent number: 9728986
    Abstract: In various embodiments a circuit is provided including: an input terminal to receive an input voltage; a switch, a first controlled input of which being coupled to the input terminal; an inductor, a first terminal of which may be coupled in series to a second controlled input of the switch; a freewheeling diode, wherein a first diode terminal may be coupled with the second controlled input of the switch and with the first terminal of the inductor, and wherein a second diode terminal may be coupled with a reference potential; a capacitor coupled with a second terminal of the inductor; and a controller configured to operate the switch and the inductor in continuous current mode to charge the capacitor.
    Type: Grant
    Filed: March 14, 2014
    Date of Patent: August 8, 2017
    Assignee: INFINEON TECHNOLOGIES AUSTRIA AG
    Inventors: Derek Bernardon, Hubert Rothleitner
  • Patent number: 9709618
    Abstract: A computer component mounting assembly includes a carrier to support a hard drive and a data connector. The carrier is configured to slidably receive the hard drive along a first axis. The data connector includes a first connector configured to mate to pins of the hard drive, a second connector configured to mate to a SATA data connector, and a flexible cable connecting the two. The first connector includes an alignment feature to engage a corresponding alignment feature on the hard drive. The first connector is coupled to the carrier and slidable in a plane perpendicular to the first axis, and the first connector is configured such that when carrier receives the hard drive and the alignment feature engages the corresponding alignment feature the first connector moves in the plane perpendicular to the first axis to provide alignment of the first connector to the pins of the hard drive.
    Type: Grant
    Filed: November 24, 2015
    Date of Patent: July 18, 2017
    Assignee: Google Inc.
    Inventors: Michael Chi Kin Lau, Jeffrey S. Spaulding, Jinal Dalal
  • Patent number: 9680389
    Abstract: A power conversion device includes a main circuit that includes a diode of which cathode is connected to a positive-side power supply path formed between a rectifier circuit and an inverter; and a switching element that is connected between an anode of the diode and a negative-side power supply path formed between the rectifier circuit and the inverter. In the main circuit, a portion between a first terminal and a second terminal, which are provided on the positive-side power supply path, is opened and a reactor is provided between the second terminal and a third terminal, which is provided at a connection point between the diode and the switching element, thus, forming a boost chopper circuit.
    Type: Grant
    Filed: December 26, 2013
    Date of Patent: June 13, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventor: Masafumi Ichihara
  • Patent number: 9680388
    Abstract: In one embodiment, a variable frequency drive system includes a main contactor, a variable frequency drive, a charging module structured to generate a magnetizing AC voltage, wherein the charging module is structured to selectively provide the magnetizing AC voltage to a transformer of the variable frequency drive, and a sensing and control circuit having a number of sensors operably associated with the variable frequency drive. The sensing and control circuit is structured to detect a short circuit condition in the variable frequency drive when the magnetizing AC voltage is provided to the transformer based on an output of at least one of the number of sensors, and responsive thereto prevent the main contactor from being closed and thereby prevent the main AC voltage from being provided to the transformer.
    Type: Grant
    Filed: September 30, 2015
    Date of Patent: June 13, 2017
    Assignee: EATON CORPORATION
    Inventors: Stan Rex Simms, Irving Albert Gibbs
  • Patent number: 9673695
    Abstract: An ASD circuit includes an input, solid-state switch rectifier bridge, DC link, and DC link capacitor bank. A pre-charge circuit is coupled between the input and the DC link capacitor bank and includes pre-charge relays operable in an on state that allows the AC power input to power the rectifier bridge during a normal operating state and an off state that allows the AC power input to pre-charge the DC link capacitor bank through a pre-charge resistor of the pre-charge circuit during a pre-charge operating state. A protection relay of a protection circuit is coupled between the pre-charge relays and the DC link capacitor bank, the protection relay operable in an on state that prevents the pre-charge circuit from connecting to the DC link capacitor bank when a capacitor short circuit occurs and an off state that allows the pre-charge circuit to electrically connect to the DC link capacitor bank.
    Type: Grant
    Filed: May 24, 2016
    Date of Patent: June 6, 2017
    Assignee: Eaton Corporation
    Inventors: Xiaoling Li, Huaqiang Li, Robert Fenton, Zhiguo Lu, Belly Lei
  • Patent number: 9537392
    Abstract: In one embodiment the present invention includes a circuit comprising a voltage adjust circuit and an input terminal of an electronic system. The voltage adjust circuit is coupled to receive an input voltage. The input terminal of the electronic system is coupled to receive a supply voltage from an output terminal of the voltage adjust circuit. The voltage adjust circuit makes an adjustment to the supply voltage based on a minimum voltage requirement of the electronic system. Accordingly, the leakage current supplied to the electronic system reduces, thereby saving power.
    Type: Grant
    Filed: May 22, 2014
    Date of Patent: January 3, 2017
    Assignee: MARVELL INTERNATIONAL LTD.
    Inventors: Shankar Kozhumam, Jon E. Tourville
  • Patent number: 9513681
    Abstract: Systems and methods for controlling inrush electrical currents (e.g., resulting from power-on event, etc.) using a virtual Miller capacitor and a metal-oxide-semiconductor field-effect transistor (MOSFET). In an illustrative, non-limiting embodiment, a method may include receiving alternating current (AC) power and providing the AC power to an electronic circuit, at least in part, via a bulk capacitor coupled to a field-effect transistor (FET), wherein the FET is coupled to a virtual Miller capacitor circuit configured to limit an amount of AC inrush current provided to the bulk capacitor.
    Type: Grant
    Filed: November 4, 2014
    Date of Patent: December 6, 2016
    Assignee: DELL PRODUCTS, L.P.
    Inventors: Lei Wang, Mehran Mirjafari, Padmanabh R. Gharpure
  • Patent number: 9484815
    Abstract: A system and method are provided for controlling a switching voltage regulator circuit. An energy difference between a stored energy of a switching voltage regulator and a target energy is determined. A control variable of the switching voltage regulator is computed based on the energy difference and the control variable is applied to a current control mechanism of the switching voltage regulator. In one embodiment, the control variable is pulse width of a control signal.
    Type: Grant
    Filed: October 16, 2013
    Date of Patent: November 1, 2016
    Assignee: NVIDIA Corporation
    Inventor: William J. Dally
  • Patent number: 9438131
    Abstract: An alternating current to direct current (AC-DC) converter is provided. The converter includes a rectifying unit configured to rectify an AC voltage that is being input, a boost converter unit connected to the rectifying unit and provided with a single inductor, a first switch, and a second switch formed thereto, a smoothing unit configured to smooth the voltage passing through the boost converter unit, and a control unit configured to control an ON/OFF of the first switch and the second switch such that the boost converter unit is operated as a power factor correction circuit or as an inrush current limiting circuit, so that the inrush current is stably controlled by reducing additional circuit structures configured for limiting an inrush current.
    Type: Grant
    Filed: November 28, 2012
    Date of Patent: September 6, 2016
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventor: Dong Hwan Lee
  • Patent number: 9385526
    Abstract: Disclosed is an inrush current suppressor circuit of a power supply circuit that supplies stand-by voltage from AC voltage. At a stand-by mode, only a diode and a resistor for suppressing inrush current are provided, and a capacitor provided in common between a stand-by power supply part and a start-up power supply part is charged, so that the inrush current is suppressed at both of stand-by and start-up modes and the number of devices of a circuit and power consumption are reduced.
    Type: Grant
    Filed: November 21, 2012
    Date of Patent: July 5, 2016
    Assignee: LG INNOTEK CO., LTD.
    Inventor: Won Seok Nam
  • Patent number: 9372522
    Abstract: A power supply system and method are disclosed. The system includes a power supply to generate an output voltage in response to a pulse-width modulation (PWM) signal and a DC main voltage. The system also includes an AC/DC converter to generate the DC main voltage based on an AC input voltage. The system further includes a power supply controller to generate the PWM signal based on feedback associated with the output voltage. The power supply controller includes a fault controller to detect an overvoltage condition associated with the power supply and to cause the AC/DC converter to disable the DC main voltage in response to the overvoltage condition.
    Type: Grant
    Filed: April 20, 2012
    Date of Patent: June 21, 2016
    Assignee: Hewlett Packard Enterprise Development LP
    Inventor: Reynaldo P Domingo
  • Patent number: 9041382
    Abstract: A power-supply circuit for a DC appliance includes an input unit including a first terminal and a second terminal so as to receive a DC current, an output unit including a third terminal to output the DC current entered by the input unit and a fourth terminal, a connection unit including a first conductive line and a second conductive line so as to interconnect the input unit and the output unit, a rectifier unit including first to fourth diodes coupled as a bridge diode format so as to rectify the input DC current in a predetermined direction, an inductor unit that is connected in series to the rectifier unit in such a manner that the input DC current is gradually increased from an abrupt change time point of the DC current, and a condenser unit that is connected in series to the inductor unit.
    Type: Grant
    Filed: January 26, 2012
    Date of Patent: May 26, 2015
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Hyun Cheol Jin, Han Sol Seo, Hyun Soo Park
  • Patent number: 8994351
    Abstract: A power supply includes a drive signal generator to generate a drive signal to control a switching of power switch. A feedback circuit is coupled to receive a feedback signal representative of the output to generate a control signal. An oscillator circuit is coupled to generate an oscillating signal in response to the control signal, from which the drive signal is generated in response. A frequency of the oscillating signal increases from a first frequency to a second frequency with respect to the control signal for a first range of control signal values, remains substantially equal to the second frequency for a second range of control signal values, and decreases from the second frequency to a third frequency with respect to the control signal for a third range of control signal values. The first range is less than the second range, which is less than the third range.
    Type: Grant
    Filed: August 2, 2011
    Date of Patent: March 31, 2015
    Assignee: Power Integrations, Inc.
    Inventor: Guangchao Zhang
  • Patent number: 8947064
    Abstract: An electronic switch is connected in series with a load dependent on an input signal. The electronic switch is operated in a first operation mode for a first time period after a signal level of the input signal has changed from an off-level to an on-level. The first operation mode includes driving the electronic switch dependent on a voltage across the load and dependent on a temperature of the electronic switch. The electronic switch is operated in a second operation mode after the first time period. The second operation mode includes driving the electronic switch dependent on the temperature according to a hysteresis curve.
    Type: Grant
    Filed: September 20, 2011
    Date of Patent: February 3, 2015
    Assignee: Infineon Technologies Austria AG
    Inventor: Martin Feldtkeller
  • Patent number: 8915094
    Abstract: A bypass device of a refrigerator connected to an inrush current preventing device bypasses an input power when the input power is applied to the refrigerator, and a controller controls the input power input through the inrush current preventing device in response to a voltage measured by a voltage measuring device, recovers a function of the inrush current preventing device, and drives a compressor. Therefore, a standby time to re-drive the refrigerator is decreased and convenience is enhanced.
    Type: Grant
    Filed: March 29, 2008
    Date of Patent: December 23, 2014
    Assignee: LG Electronics Inc.
    Inventors: Jae Yoo Yoo, Chang Oh Kim
  • Patent number: 8907630
    Abstract: An inrush current protection circuit for charging a load to a target voltage, in which the inrush current protection circuit includes a first charging circuit and a second charging circuit. The first charging circuit charges a load to a first stage voltage, and there is a voltage difference existing between the target voltage and the first stage voltage. The second charging circuit charges the load form the first stage voltage to the target voltage, in which the first charge circuit charges slower than the second charging circuit.
    Type: Grant
    Filed: January 14, 2011
    Date of Patent: December 9, 2014
    Assignee: Himax Analogic, Inc.
    Inventor: Ching-Wei Hsueh
  • Patent number: 8872490
    Abstract: Provided is a voltage regulator which includes an inrush current prevention circuit so that no current is consumed after the start-up of the voltage regulator. A start-up circuit of the voltage regulator includes: a constant current circuit; a first transistor connected between the constant current circuit and a constant voltage generation circuit; a second transistor including a drain connected to a gate of the first transistor, and a gate to which a voltage based on an output voltage is input; a first depletion transistor including a gate connected to the drain of the second transistor, and a source connected to a source of the second transistor; and a third transistor including a gate connected to the gate of the second transistor, and a drain connected to the drain of the second transistor.
    Type: Grant
    Filed: March 4, 2013
    Date of Patent: October 28, 2014
    Assignee: Seiko Instruments Inc.
    Inventors: Kiyoshi Yoshikawa, Osamu Uehara
  • Patent number: 8866345
    Abstract: An electronic current managing system (ECMS) (10) that utilizes “phase control” to set the maximum current draw of an output load (28) that can consist of an inductive or a dynamic load. The ECMS (10) features a “soft start” that ramps the electric current from zero to full current over a two second period of time. The “soft start” eliminates high in-rush current or power surges from being applied to a system distribution panel or master breaker, thereby allowing a larger output load (28) than would otherwise be possible. The ECMS (10) includes an SCR (22) that causes a power control relay (20) to close or to open in the event the SCR (22) fails and the output load (28) attempts to stay “on”. An example of an ECMS (10) output load (28) is a self regulating cable which has a high in-rush current draw that is approximately three times the rated current per watt.
    Type: Grant
    Filed: May 27, 2011
    Date of Patent: October 21, 2014
    Inventor: Shawn P. Wright
  • Patent number: 8810225
    Abstract: Methods of a switching mode DC/DC converter are provided in the present invention. The proposed method includes a step of causing a switching frequency of the converter to be operated at a rated value multiplied by a second predetermined value when an output voltage of the converter is not larger than a first predetermined value.
    Type: Grant
    Filed: December 27, 2011
    Date of Patent: August 19, 2014
    Assignee: Hanergy Technologies, Inc.
    Inventors: Chung-Kuang Huang, Xiao-Ming Duan, Ronald Chang
  • Patent number: 8804383
    Abstract: A starter of the grid-connected inverter and a control method thereof are disclosed. The starter comprises a controller, and a first switch and a first resistor connected in parallel. The controller includes an input end, and first and second output ends. The input end inspects the DC voltage signal from the inverter. When the DC voltage exceeds a predetermined voltage threshold, the first output end sends a first control signal to turn on the first switch, and the second output end sends a second control signal to make the grid-connected inverter enter into a chopping mode. There is a delay period between the send time of the first control signal and that of the second control signal.
    Type: Grant
    Filed: July 9, 2012
    Date of Patent: August 12, 2014
    Assignee: Delta Electronics, Inc.
    Inventors: Wen-Tao Zhan, Liang Li, Hong-Yang Wu, Heng Huang, Bin Wang
  • Patent number: 8797011
    Abstract: A variable current limiter, a power supply and a method of operating a non-isolated voltage converter are disclosed herein. In one embodiment, the variable current limiter includes: (1) a converter controller configured to regulate an output voltage of a non-isolated voltage converter and limit an output current thereof and (2) a limit provider configured to provide a variable output current limit that inversely varies with the output voltage, the converter controller configured to employ the variable output current limit to limit the output current.
    Type: Grant
    Filed: December 13, 2010
    Date of Patent: August 5, 2014
    Assignee: General Electric Company
    Inventors: Hongping Li, Vijayan Joseph Thottuvelil
  • Patent number: 8779735
    Abstract: A method for controlling a current between an energy source and a load is disclosed. A switching module is coupled between the energy source and the load. The switching module includes two input terminals coupled to the energy source and two output terminals coupled to the load and at least one semiconductor switching element coupled between one of the input terminals and one of the output terminals. At least one current parameter of the current is measured between the energy source and the load. The current between the energy source and the load is interrupted by switching off the switching element when the at least one current parameter reaches or exceeds at least one predetermined parameter threshold value.
    Type: Grant
    Filed: March 15, 2011
    Date of Patent: July 15, 2014
    Assignee: Infineon Technologies AG
    Inventors: Werner Roessler, Gerald Deboy
  • Patent number: 8730689
    Abstract: A capacitive power supply including an input section having input terminals for connection to an AC-mains supply, and a capacitive coupling, a rectification section coupled via the capacitive coupling to the input terminals, and an output section coupled to the rectification section, the output section including output terminals, for providing an output voltage to a load, a first chain including a charge storage facility, and a second chain arranged in parallel to the first chain, and including an output voltage limiting facility, the capacitive power supply further including an inrush current limiting facility, wherein the output terminals are connected to respective terminals of the output voltage limiting facility, and the DC-conducting series impedance has a resistive component with a resistive value of at least 0.2 times a resistive value of the first chain.
    Type: Grant
    Filed: November 21, 2008
    Date of Patent: May 20, 2014
    Assignee: Koninklijke Philips N.V
    Inventor: Thijs De Haan
  • Patent number: 8717001
    Abstract: In various embodiments a circuit is provided including: an input terminal to receive an input voltage; a switch, a first controlled input of which being coupled to the input terminal; an inductor, a first terminal of which may be coupled in series to a second controlled input of the switch; a freewheeling diode, wherein a first diode terminal may be coupled with the second controlled input of the switch and with the first terminal of the inductor, and wherein a second diode terminal may be coupled with a reference potential; a capacitor coupled with a second terminal of the inductor; and a controller configured to operate the switch and the inductor in continuous current mode to charge the capacitor.
    Type: Grant
    Filed: July 3, 2012
    Date of Patent: May 6, 2014
    Assignee: Infineon Technologies Austria AG
    Inventors: Derek Bernardon, Hubert Rothleitner
  • Patent number: 8716992
    Abstract: A current limiting circuit for limiting an output current in response to a control current includes a detection circuit to detect a detection voltage responsive to an output voltage, and a control current generating circuit to generate a control current responsive to the detection voltage, wherein the control current generating circuit includes a first transistor through which the control current flows, a second transistor that becomes conductive upon a voltage responsive to an amount of the control current being greater than a predetermined voltage above the detection voltage, and a resistor connecting between a base and an emitter of the second transistor to raise a potential at the base of the second transistor above a predetermined level, wherein the amount of the control current flowing through the first transistor decreases as an amount of a current flowing through the second transistor increases.
    Type: Grant
    Filed: November 14, 2011
    Date of Patent: May 6, 2014
    Assignee: Mitsumi Electric Co., Ltd.
    Inventors: Yoichi Takano, Shinichiro Maki, Hiroshi Nozaki
  • Patent number: 8711580
    Abstract: A resonant conversion system is provided, in which a resonant converter receives an input voltage to generate an output voltage, and a buck converter provides the input voltage of the resonant converter, and controls the input voltage to perform an over-current protection process.
    Type: Grant
    Filed: May 20, 2011
    Date of Patent: April 29, 2014
    Assignee: Delta Electronics, Inc.
    Inventors: Jinfa Zhang, Lei Cai, Jiaojun Sun, Guodong Yin
  • Patent number: 8711587
    Abstract: [Problem] To provide a power converter capable of suppressing voltage dropping of the smoothing capacitor and suppressing a rush current at the time of power recovery, [Means for Resolution] When it is determined that a bus voltage Vdc detected by a DC voltage detecting unit 24 is equal to or less than a predetermined reference voltage, a control device 20 allows a DC load control unit 23 to stop an operation of a DC load 30.
    Type: Grant
    Filed: September 28, 2011
    Date of Patent: April 29, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Ryuji Momose, Katsuyuki Amano
  • Patent number: 8693216
    Abstract: The present invention relates to a switch control device, a power supply device, and a switch control method. A switch control device controls a switching operation of a power switch by using a feedback voltage of an output voltage. In detail, the switch control device generates the feedback current according to the feedback voltage and the feedback signal corresponding to the feedback voltage by using the feedback current. The switch control device compares the sensing signal corresponding to the drain current flowing to the power switch and the feedback signal, and turns off the power switch according to the comparison result. The switch control device increases the feedback gain rather than the feedback current during the gain compensation period after a predetermined gain compensation period, and the gain compensation period is longer than a soft start period in which the output voltage is gradually increased.
    Type: Grant
    Filed: February 15, 2011
    Date of Patent: April 8, 2014
    Assignee: Fairchild Korea Semiconductor Ltd.
    Inventors: Sang Cheol Moon, Hyun-Chul Eom, Kwang-Il Lee
  • Patent number: 8670251
    Abstract: A regulating apparatus with soft-start and fast-shutdown function is applied to a voltage-supplying apparatus. The regulating apparatus includes a soft-start and fast-shutdown circuit, a regulating circuit, and a ground circuit. When voltages are supplied from the voltage-supplying apparatus to the soft-start and fast-shutdown circuit, the regulating circuit, and the ground circuit, the ground circuit is connected to ground, so that the starting time of the regulating circuit is delayed by the soft-start and fast-shutdown circuit. When voltages are not supplied from the voltage-supplying apparatus to the soft-start and fast-shutdown circuit, the regulating circuit, and the ground circuit, the ground circuit is not connected to ground, so that the regulating circuit is shut down fast by the soft-start and fast-shutdown circuit.
    Type: Grant
    Filed: February 7, 2012
    Date of Patent: March 11, 2014
    Assignee: Chicony Power Technology Co., Ltd.
    Inventors: Jung-Chang Lu, Chi-Shin Chu, Chung-Shu Lee
  • Patent number: 8638575
    Abstract: In one embodiment, a startup circuit for a power supply is provided. The startup circuit comprises a resistance coupled between a voltage source and a first node. A first capacitor, coupled to the first node, is operable to be charged by current flowing through the resistance. A first transistor has an emitter, a base, and collector, wherein the collector is coupled to the voltage source and the base is coupled to the first node. A diac circuit, coupled to the emitter of the first transistor, is operable to fire to turn on the first transistor, thereby allowing discharge of the first capacitor through the base-emitter junction of the first transistor. A second capacitor is operable to be charged by current related to a discharge voltage resulting from the firing of the diac circuit. The second capacitor operable to store charge to provide VCC voltage to a controller of the power supply.
    Type: Grant
    Filed: August 11, 2011
    Date of Patent: January 28, 2014
    Assignee: Fairchild Semiconductor Corporation
    Inventor: Richard A. Dunipace
  • Patent number: 8633751
    Abstract: Power gating control and related circuitry for integrated circuits is described herein. A centralized power gating control circuit uses trigger circuits to control the on/off switching of power gating circuits distributed at different points in a chip, integrated circuit, module or block (collectively “IC”). The power gating circuits may include power gates partitioned for sleep and shutdown modes. The shutdown mode power gates may employ multi-level power gate architecture to minimize inrush current during power-up of the IC. Each level may be associated with or tied to a trigger circuit and activated based on a voltage level reaching the voltage threshold of the trigger circuit. The power gating control and related circuitry may be embedded in the IC.
    Type: Grant
    Filed: November 10, 2011
    Date of Patent: January 21, 2014
    Assignee: Advanced Micro Devices, Inc.
    Inventor: Arun B. Hegde
  • Patent number: 8630104
    Abstract: A switching power supply has a function of improving a power factor, and outputs insulated DC. The switching power supply performs two kinds of controls for switching devices exclusive to each other: controlling of a switching device provided in a direction in which the discharging of a primary-side smoothing capacitor is prohibited at the time of suspension of commercially available AC power and near the zero cross of an input voltage; and causing a switching device provided between the output side of a third winding and the primary-side smoothing capacitor to control a charging current, thereby charging a capacitor in a boosted manner.
    Type: Grant
    Filed: August 25, 2011
    Date of Patent: January 14, 2014
    Assignee: TKR Corporation
    Inventors: Takayuki Ouchi, Minoru Moteki, Akihiko Kanouda
  • Patent number: 8625317
    Abstract: The present invention provides an isolated switch-mode power supply device capable of sufficiently reducing power consumption in a standby mode. An isolated switch-mode power supply device includes: a capacitor that supplies control power for controlling switching of a switching element; a first control unit that includes a constant current supplying unit that controls switching of the switching element; a switching element that connects or disconnects the first control unit and the capacitor; a capacitance element unit having a capacitor to which a constant current is supplied from the constant current supplying unit, a capacitor charge voltage of the capacitance element unit changing according to an outputted voltage in the standby mode; and a second control unit that controls power supply to the first control unit by closing or opening the switching element during a switching pause period in the standby mode according to the capacitor charge voltage of the capacitor.
    Type: Grant
    Filed: July 13, 2011
    Date of Patent: January 7, 2014
    Assignee: Shindengen Electric Manufacturing Co., Ltd.
    Inventors: Masaaki Hayashi, Hiroshi Narisawa
  • Patent number: 8624569
    Abstract: A voltage regulator permits reduced current consumption by promptly and timely stopping the operation of an inrush current protection circuit immediately after the voltage regulator is started up. The voltage regulator has an output voltage detection circuit, which issues a detection signal to actuate the inrush current protection circuit when a low voltage at an output terminal is detected at the time of starting up the voltage regulator. When it is detected that the voltage at the output terminal has reached a predetermined level, the operation of the inrush current protection circuit is stopped and a power path of the output voltage detection circuit is cut off.
    Type: Grant
    Filed: March 29, 2012
    Date of Patent: January 7, 2014
    Assignee: Seiko Instruments Inc.
    Inventor: Socheat Heng
  • Patent number: 8593215
    Abstract: The invention discloses a power gating for in-rush current mitigation. Firstly the circuit uses small power switch cells at first stage, such that those power switch cells run in saturation region. Secondly a delay unit delays a switch signal to control the dwell time of current to reduce the peak value of the current. Thirdly large power switch cells are used at the rest, such that those power switch cells operate in linear region.
    Type: Grant
    Filed: January 20, 2012
    Date of Patent: November 26, 2013
    Assignees: Global Unichip Corporation, Taiwan Semiconductor Manufacturing Company Limited
    Inventor: Shih-Hao Chen
  • 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: 8581637
    Abstract: A low-power, low-latency power-gate (LPLLPG) circuit is used to shut off or otherwise reduce power that is provided to electronic component(s), such as in a sleep or standby mode. ON-rush current is controlled by sizing at least one transistor in the power-gate circuit, and power consumption of the power-gate circuit in both standby state and active state is reduced by not using additional delay elements. Ramping up a gated voltage supply with low ON-rush current is performed by applying/using logic rather than delay signals. This logic does not turn ON transistors in the power-gate circuit until the gated voltage supply has ramped up close to a level of an ungated voltage supply. By not using additional delay cells, faster turn OFF of the gated voltage supply is obtained.
    Type: Grant
    Filed: June 29, 2011
    Date of Patent: November 12, 2013
    Assignee: Intel Corporation
    Inventors: Suganth Paul, Jhonny Anthonio Wong
  • Patent number: 8576594
    Abstract: An AC-DC power converter has a phase-shifting autotransformer based rectifiers and DC capacitors. Soft start of the AC-DC power converter is achieved by designing the autotransformer to operate at a low peak flux density at a point of AC voltage step application (initial turn on). The addition of a controlled impedance segregates capacitor charging from the initial magnetizing process of the autotransformer.
    Type: Grant
    Filed: April 4, 2011
    Date of Patent: November 5, 2013
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Frank Z. Feng, Barry John Parker
  • Patent number: 8570778
    Abstract: A power converter, comprising an input circuit having a single diode rectifier (D); and a switcher mode power supply IC (SMPS).
    Type: Grant
    Filed: October 5, 2004
    Date of Patent: October 29, 2013
    Assignee: NXP B.V.
    Inventor: Cornelis Johannes Adrianus Schetters
  • Patent number: 8542506
    Abstract: A power isolation system and method is disclosed. The system includes a transformer suitable for use in the power isolation system, and a semiconductor device electrically connected to the transformer to provide a reduction of the inrush current associated with powering the transformer, wherein the semiconductor device is activated upon power up based upon the previous shutdown state of the power isolation system to provide a soft start to the transformer, and after activation of the transformer, the semiconductor device is shorted in the system.
    Type: Grant
    Filed: November 16, 2009
    Date of Patent: September 24, 2013
    Assignee: Middle Atlantic Products, Inc.
    Inventors: Robert Schluter, Bernard P. O'Kane, Brendan K. Walsh, Steve Kaufer
  • 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 “n” 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: 8472216
    Abstract: A circuit arrangement includes a switching element that switches a load current, a current-limiting element connected in series to the switching element, a bistable first relay connected in parallel to the switching element and the current-limiting element, and a control circuit that switches the power-supply unit from a first operating state to a second operating state in which a load current for generating a DC voltage flows from the power grid to the power-supply unit, such that the control circuit turns on the switching element for a first time period during switching of the power-supply unit from the first to the second operating state, to turn the bistable relay on during the first time period, and to turn the switching element off at the end of the first time period.
    Type: Grant
    Filed: May 25, 2009
    Date of Patent: June 25, 2013
    Assignee: Fujitsu Technology Solutions Intellectual Property GmbH
    Inventor: Peter Busch
  • Patent number: 8456867
    Abstract: An isolated switched mode power supply (SMPS) is disclosed. The SMPS comprises a switching controller to generate start-up and operational switching control signals. The SMPS further includes a transformer, having a primary winding, and a full-bridge drive circuit to drive the primary winding. The full-bridge drive circuit comprises a first switching element, a boot-strap dnving circuit, and a second switching element. The switching controller is further used to start up isolated SMPS by determining a duty cycle for operational control signals and generating the start-up switching control signals.
    Type: Grant
    Filed: December 1, 2011
    Date of Patent: June 4, 2013
    Assignee: Telefonaktiebolaget LM Ericsson (Publ)
    Inventors: Magnus Karlsson, Anders Kullman, Jonas Malmberg, Fredrik Wahledow
  • Patent number: 8446744
    Abstract: A method and a control device control a switching device for providing a resonant circuit with a switching voltage for generating a resonant current in order to provide a required output power at an output of a resonant power converter.
    Type: Grant
    Filed: March 2, 2009
    Date of Patent: May 21, 2013
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Thomas Scheel, Christian Hattrup, Peter Luerkens
  • Patent number: 8416004
    Abstract: A circuit module includes: control object circuits which start operations when a power supply voltage reaches a target value; a current sink circuit which consumes a current supplied thereto; and a power supply activation control unit which increases the current flowing into the current sink circuit at a predetermined rate before starting the operations of the control object circuits and which starts the operations of the control object circuits and simultaneously blocks the supply of the current to the current sink circuit in a case where an amount of the current flowing into the current sink circuit is equivalent to an amount of current to be increased by starting the operations of the control object circuits when the power supply voltage reaches the target value.
    Type: Grant
    Filed: December 8, 2011
    Date of Patent: April 9, 2013
    Assignee: Fujitsu Optical Components Limited
    Inventors: Masaru Akizawa, Kazuyoshi Shimizu