With Automatic Control Of The Magnitude Of Output Voltage Or Current Patents (Class 363/19)
  • Patent number: 9130463
    Abstract: A drive circuit for a switching element includes a constant-current control unit and a restriction unit. The constant-current control unit performs a constant-current control for charging an open/close control terminal of a switching element to be driven which is a voltage-controlled switching element with electric charge for turning on the switching element. The restriction unit restricts, to a reference voltage, a voltage between the open/close control terminal and a first end of a pair of ends of a current flow path of the switching element for a predetermined period following a start of the constant-current control within a charging process period during which the open/close control terminal is charged with the electric charge such that the switching element is turned on.
    Type: Grant
    Filed: March 27, 2012
    Date of Patent: September 8, 2015
    Assignee: DENSO CORPORATION
    Inventors: Takeyasu Komatsu, Yoshiyuki Hamanaka, Tsuneo Maebara, Ryotaro Miura
  • Patent number: 9083246
    Abstract: A switched mode power supply (SMPS) includes a transformer with a primary winding, a secondary winding, an auxiliary winding, and a power switch coupled to the primary winding. During one switching cycle, the auxiliary winding provides a feedback signal which includes a first voltage pulse that is induced after the power switch is turned on and a second voltage pulse that is induced after the power switch is turned off. A control circuit includes a circuit for generating a sampling signal for sampling the second voltage pulse in a switching cycle at a time that is determined based on the first voltage pulse in the same switching cycle. A sample-and-hold circuit is configured for sampling and storing the second voltage pulse in response to the sampling signal. A switching signal generating circuit is configured to generate a switching signal for controlling the power switch based on an output of the sample-and-hold circuit.
    Type: Grant
    Filed: April 20, 2011
    Date of Patent: July 14, 2015
    Assignee: BCD Semiconductor Manufacturing CO., LTd.
    Inventors: Qiang Zong, Huizhen Zhu, Pingan Zhao, Yajiang Zhu
  • Patent number: 9071152
    Abstract: The present invention provides a switched-mode power converter with regulation demand pulses sent across a galvanic isolation barrier.
    Type: Grant
    Filed: June 21, 2013
    Date of Patent: June 30, 2015
    Assignee: CogniPower, LLC
    Inventors: William H. Morong, Thomas E. Lawson
  • Patent number: 9054514
    Abstract: A low let-through voltage surge suppression or protection circuit for protecting hardware or equipment from electrical surges. During operation when no surge condition is present, the circuit allows propagation of signals from a source to a load along a signal path. When a surge is present, the circuit senses and diverts the surge away from the signal path, utilizing common mode and/or differential mode surge protection. An electronic filter is connected in parallel with surge suppression circuit elements for reducing the let through voltage that would otherwise propagate and require a higher power surge suppression circuit element to mitigate. Cascading multiple electronic filters in parallel with surge suppression circuit elements further reduces voltage let through.
    Type: Grant
    Filed: February 11, 2013
    Date of Patent: June 9, 2015
    Assignee: Transtector Systems, Inc.
    Inventor: Eric Nguyen
  • Patent number: 9030844
    Abstract: A multilevel DC-DC converter includes a voltage source that provides a voltage Vout1 to at least one charge converter circuit and an output filter capacitor having an associated output voltage Vout2. The at least one charge converter circuit includes a transformer having at least one primary winding and at least two secondary windings, a primary and secondary circuit each having at least two switching elements, and a control unit which receives a control signal, such as but not limited to an envelope tracking signal, which represents a desired output voltage. The control unit is arranged to provide output control signals to the respective switching elements of the primary and secondary circuits to activate and deactivate the respective switching elements to obtain a desired output voltage Vout2. The multilevel DC-DC converter can be arranged to operate as a boost converter or as a buck-boost converter.
    Type: Grant
    Filed: December 14, 2012
    Date of Patent: May 12, 2015
    Assignee: Analog Devices, Inc.
    Inventor: Bernhard Strzalkowski
  • Patent number: 8988902
    Abstract: A controller integrated circuit (IC) for controlling a power converter uses one or more IC pins having plurality of functions such as configuration of a parameter supported by the controller IC and shutdown protection. Several different functions may be supported by a single IC pin, thereby reducing the number of pins required in the controller IC and also reducing the cost of manufacturing the controller IC. The controller IC may also share a comparison circuit among different pins and the different functions provided by those pins. Use of a shared comparison circuit further reduces the cost of manufacturing the controller IC without sacrificing the performance of the IC.
    Type: Grant
    Filed: September 12, 2012
    Date of Patent: March 24, 2015
    Assignee: Dialog Semiconductor, Inc.
    Inventors: Xiaolin Gao, Yong Li, Qiu Sha, Fuqiang Shi, John William Kesterson, Jiang Chen
  • Publication number: 20150070941
    Abstract: An electrostatic induction conversion device includes: an input-side electrostatic actuator that includes a first fixed electrode and a first movable electrode facing the first fixed electrode; and an output-side electrostatic actuator that includes a second movable electrode linked to the first movable electrode via a link mechanism member, which increases or decreases a displacement quantity representing an extent of displacement occurring at the first movable electrode, and a second fixed electrode facing the second movable electrode, wherein: a permanently charged layer is deposited on an electrode surface either on a movable electrode side or on a fixed electrode side, at the input-side electrostatic actuator and the output-side electrostatic actuator.
    Type: Application
    Filed: August 26, 2013
    Publication date: March 12, 2015
    Applicant: National University Corporation Shizuoka Universit y
    Inventors: Masato Suzuki, Hiroki Hayashi, Gen Hashiguchi, Tatsuhiko Sugiyama
  • Patent number: 8947018
    Abstract: A dimmable LED driver adapted to be operated with a dimmer that is configured to generate a predetermined conductive angle, wherein the dimmable LED driver comprises: a rectifier configured to convert an alternating current output by the dimmer to a direct current, a buck PFC block configured to adjust an output voltage of the direct current so as to obtain a stable output voltage, a second buck DC/DC block configured to realize output of a constant current after the stable output voltage is realized, a dimming block configured to, after realizing output of the constant current, accomplish a dimming function jointly with the second buck DC/DC block, and an MCU configured to control the buck PFC block, the second buck DC/DC block and the dimming block.
    Type: Grant
    Filed: May 3, 2012
    Date of Patent: February 3, 2015
    Assignee: OSRAM GmbH
    Inventors: Luca Bordin, Shaoping Chen, Yuli Chen, Shijun Nie, Wei Tan
  • Patent number: 8907685
    Abstract: Disclosed is a circuit arrangement for determining a temporal change of an output voltage of a half-bridge circuit during a dead time. In one embodiment, the circuit arrangement includes a first input for applying the output voltage. A capacitive network includes a first and a second circuit node capacitively coupled to the input, and having a terminal for a reference potential. A recharging circuit during the switched-on phase of one of a first and second switching elements, adjusts electrical potentials of the first and second nodes, the electrical potentials each being different from the reference potential. A comparator arrangement, during the dead time, determines a time difference between such times at which the electrical potentials at the first and second node each assume a given potential value, the time difference being a measure for the change with time of the output voltage.
    Type: Grant
    Filed: August 23, 2012
    Date of Patent: December 9, 2014
    Assignee: Infineon Technologies Austria AG
    Inventor: Martin Feldtkeller
  • Patent number: 8874395
    Abstract: Various arrangements for determining a voltage of a voltage source using pre-charging are presented. Such arrangements may include a measurement module which includes an analog to digital converter, a driver, and an interface. The interface may be electrically coupled with the analog to digital converter and the driver. The driver may be configured to output current to charge a capacitor. After a first predefined period of time, the driver may stop outputting current to pre-charge the capacitor. After the driver has stopped pre-charging the capacitor and a second predefined period of time has elapsed, the analog to digital converter may be configured to measure a voltage of the capacitor. Such arrangements may include a capacitor, wherein the capacitor is electrically coupled with the interface of the measurement module.
    Type: Grant
    Filed: October 31, 2011
    Date of Patent: October 28, 2014
    Assignee: Echostar Technologies L.L.C.
    Inventor: Jeremy Mickelsen
  • Patent number: 8842447
    Abstract: A DC power supply (1) having a series regulator (2) for generating a fixed output DC voltage (VCC) at a variable input AC voltage (VAC) with low power loss. For this purpose, the DC power supply (1, 101, 201, 301) has a transformer (3, 103) having at least two auxiliary windings (W1, W2) having different numbers of windings that can each be connected via a switching device (4, 104, 204, 304) to the series regulator (2). Switching is effected such that the power loss is kept as low as possible.
    Type: Grant
    Filed: October 26, 2012
    Date of Patent: September 23, 2014
    Assignee: Minebea Co., Ltd.
    Inventors: Josef Fisch, Mykhaylo Raykhman
  • Patent number: 8836165
    Abstract: Disclosed is a dual-source converter for a hybrid power supply. The converter includes a first power circuit, a second power circuit, an auxiliary circuit, an output circuit and a closed loop circuit. The first power circuit is electrically connected to the second power circuit in series for receiving two varied voltage sources. The auxiliary circuit is configured to achieve soft switching of all switches. The closed loop circuit is configured to control the duty cycles of the first power circuit, the second power circuit and the auxiliary circuit so as to improve the efficiency of the dual-source converter.
    Type: Grant
    Filed: December 14, 2010
    Date of Patent: September 16, 2014
    Assignee: Chung-Shan Institute of Science and Technology, Armaments, Bureau, Ministry of National Defense
    Inventors: Jung-Tzung Wei, Chung-You Lin, Bo-Han Chen, Kuo-Kuang Jen, Yu-Min Liao
  • Patent number: 8830702
    Abstract: Described are improvements in power factor control and systems embodying said improved power factor control. Improvements lie in a method of zero voltage switching in which a capacitor is placed in parallel with a switching device, and the switching device is operated responsive to a change in the polarity of the current through the capacitor. Switching therefore occurs at zero or close to zero voltage across the switching device in both on and off modes resulting in very low switching losses and electromagnetic interference. Systems employing the method include a power factor controller, LED light source, boost converter and a power source comprising one or more photovoltaic cells.
    Type: Grant
    Filed: July 1, 2011
    Date of Patent: September 9, 2014
    Inventor: Alistair Allan Macfarlane
  • Patent number: 8791399
    Abstract: An object of the invention is to accurately detect a state of an object to be heated in a cooking vessel and effectively avoid cooking failure. An induction heating section (13) inductively heats a cooking vessel (11). A vibration detecting section (14) detects a vibration of the cooking vessel (11) via a top plate (12). A vibration waveform extracting section (15) extracts a vibration waveform of a frequency component having a frequency equal to a predetermined multiplication product of an induction heating frequency, from a waveform of the vibration detected by the vibration detecting section (14). A determining section (16) determines a state of an object to be heated, based on the vibration waveform extracted by the vibration waveform extracting section (15).
    Type: Grant
    Filed: May 1, 2007
    Date of Patent: July 29, 2014
    Assignee: Panasonic Corporation
    Inventors: Sachio Nagamitsu, Makiko Noda
  • Patent number: 8786213
    Abstract: LED dimming control circuit and method compensate LED current or LED average current by LED characteristics to improve dimming efficiency and performance. LED characteristic related look-up tables are stored to provide compensation values, and input LED current setting information is compensated by the compensation values to generate corrected LED current setting information for determining LED brightness.
    Type: Grant
    Filed: December 5, 2012
    Date of Patent: July 22, 2014
    Assignee: Richtek Technology Corp.
    Inventors: Shei-Chie Yang, Shui-Mu Lin, Jun-Sheng Cheng, Ming-Yu Lin, Chun-I Lin
  • Publication number: 20140177284
    Abstract: A switching power-supply apparatus includes: a control circuit that controls on-and-off switching of a switching element; a first rectifying-and-smoothing circuit that smoothes a voltage generated in a secondary winding; and a second rectifying-and-smoothing circuit that smoothes a voltage generated in a tertiary winding as a power supply voltage, a starting circuit that supplies: a first constant current to the control circuit when the power supply voltage is equal to or lower than a first threshold voltage, which is lower than a starting voltage of the control circuit, and is larger than the starting voltage of the control circuit, as a starting current; and a second constant current, which is greater than the first constant current, to the control circuit when the power supply voltage is larger than the first threshold voltage and is equal to or lower than the starting voltage, as the starting current.
    Type: Application
    Filed: December 20, 2013
    Publication date: June 26, 2014
    Applicant: SANKEN ELECTRIC CO., LTD.
    Inventor: Toshihiro Nakano
  • Patent number: 8749994
    Abstract: Consistent with example embodiments disclosed, there are switched-mode power supplies (SMPS) in which a signaling capacitor transmits information across a transformer of the power supply. Such embodiments can avoid drawing power from the output capacitor in order to provide communication signals and so do not cause a drop in the output voltage when signaling to the primary side. Further, the switched mode power supply can send signals from the secondary side of the transformer to the primary side via the transformer itself and so may not require the incorporation of an opto-coupler. Such embodiments may reduce production costs, the printed circuit board (PCB) footprint and reduce the no-load power consumption of the SMPS.
    Type: Grant
    Filed: October 1, 2013
    Date of Patent: June 10, 2014
    Assignee: NXP B.V.
    Inventor: Jeroen Kleinpenning
  • Patent number: 8729558
    Abstract: According to one embodiment, a nitride semiconductor device includes a semiconductor layer, a source electrode, a drain electrode, a first and a second gate electrode. The semiconductor layer includes a nitride semiconductor. The source electrode provided on a major surface of the layer forms ohmic contact with the layer. The drain electrode provided on the major surface forms ohmic contact with the layer and is separated from the source electrode. The first gate electrode is provided on the major surface between the source and drain electrodes. The second gate electrode is provided on the major surface between the source and first gate electrodes. When a potential difference between the source and first gate electrodes is 0 volts, a portion of the layer under the first gate electrode is conductive. The first gate electrode is configured to switch a constant current according to a voltage applied to the second gate electrode.
    Type: Grant
    Filed: August 29, 2011
    Date of Patent: May 20, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Masahiko Kuraguchi
  • Patent number: 8687384
    Abstract: A switching power supply device that includes a feedback terminal to which a feedback signal according to a load state is input, and a comparator which compares a terminal voltage of the feedback terminal with a reference voltage and determines whether the load state is a normal load state or a light load state. The switching power supply device also includes pull-up resistors which are connected to the feedback terminal, a switch element which switches resistance values of the pull-up resistors according to the change of the load state, and a switch element which switches the resistance values of the pull-up resistors according to whether the input voltage is high or low.
    Type: Grant
    Filed: November 9, 2011
    Date of Patent: April 1, 2014
    Assignee: Fuji Electric Co., Ltd.
    Inventors: Jian Chen, Masayuki Yamadaya
  • Patent number: 8629631
    Abstract: Improving start-up time of a light emitting diode (led) driver at lower input voltage is accomplished with a quick start circuit comprising a constant current source that replaces the traditional trickle charge start-up path for charging of a Vcc capacitor supplying operating voltage to an SMPS controller. Also the constant current source will only be operational during SMPS start-up, then will turn off after the SMPS is capable of producing its own regulated power supply to the Vcc terminal of the SMPS controller, thereby minimizing E2/R power losses in the SMPS.
    Type: Grant
    Filed: July 21, 2011
    Date of Patent: January 14, 2014
    Assignee: Cooper Technologies Company
    Inventors: Scott Edward Rhodes, William Thomas Hopkins
  • Patent number: 8625314
    Abstract: A switching power supply apparatus includes a low-side switching control unit and a high-side switching control unit. The low-side switching control unit includes a low-side turn-off circuit that turns off a low-side switching element behind a delay time when reversal of the polarity of a winding voltage of a transformer is detected during a period in which a drive voltage signal is supplied to the low-side switching element. The high-side switching control unit includes a high-side turn-on delay circuit that delays a time from the time when the polarity of the winding voltage of the transformer is reversed to a time when a high-side switching element is turned on. The delay time of the low-side turn-off delay circuit is set so as to be shorter than the delay time of the high-side turn-on delay circuit.
    Type: Grant
    Filed: October 26, 2012
    Date of Patent: January 7, 2014
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Tatsuya Hosotani, Naoki Yamaguchi
  • Patent number: 8611108
    Abstract: An example control element for use in a power supply includes a high-voltage transistor and a control circuit to control switching of the high-voltage transistor. The high-voltage transistor includes a drain region, source region, tap region, drift region, and tap drift region, all of a first conductivity type. The transistor also includes a body region of a second conductivity type. An insulated gate is included in the transistor such that when the insulated gate is biased a channel is formed across the body region to form a conduction path between the source region and the drift region. A voltage at the tap region with respect to the source region is substantially constant and less than a voltage at the drain region with respect to the source region in response to the voltage at the drain region exceeding a pinch off voltage.
    Type: Grant
    Filed: August 9, 2012
    Date of Patent: December 17, 2013
    Assignee: Power Integrations, Inc.
    Inventor: Donald R. Disney
  • Patent number: 8611110
    Abstract: A switching control IC conducts on-off control on a first switching element. A second switching control circuit is provided between a high-side driving winding of a transformer T and a second switching element. The second switching control circuit discharges a capacitor in a negative direction with a constant current during an on period of the first switching element, and then after the second switching element is turned on, charges the capacitor in a positive direction with a constant current. A transistor controls the on period of the second switching element in accordance with the ratio of a charging current to a discharge current such that the ratio of the on period of the second switching element to the on period of the first switching element is substantially always constant.
    Type: Grant
    Filed: August 14, 2012
    Date of Patent: December 17, 2013
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Tatsuya Hosotani
  • Patent number: 8582320
    Abstract: There is provided a self-excited switching power supply circuit. A cycle control capacitor is charged with a flyback voltage generated in a feedback winding of a transformer during OFF operation period in which an exciting current does not flow in a primary winding of the transformer. An OFF control capacitor the charging speed of which changes ON operation period is charged with the charging voltage of the cycle control capacitor during the ON operation period in which an exciting current flows in the primary winding. The charging voltage of the cycle control capacitor is changed with a periodic cycle Tc sufficiently longer than an oscillation cycle To to make the oscillation cycle To of continuous oscillating operation variable based on the periodic cycle Tc. As a result, the frequency of a harmonic is distributed.
    Type: Grant
    Filed: March 7, 2012
    Date of Patent: November 12, 2013
    Assignee: SMK Corporation
    Inventors: Katsuhiko Okitsu, Toshihiro Amei, Kenji Hatano, Yoshitaka Kimura
  • Publication number: 20130294112
    Abstract: A power converter controller and methods for its operation are provided that can control a self-oscillating power converter that uses a Bipolar Junction Transistor (BJT) as a switch by manipulating the current flowing in a control winding. The controller is able to determine the optimum time to remove a short circuit applied to the control winding, as well as being able to determine the optimum time to pass current through the control winding. The controller can further draw power from the power converter using the control winding. The controller is capable of maintaining the midpoint voltage of the power converter in the case that the converter has more than one switch. The controller estimates the output power of the converter without requiring a connection to the secondary side of the converter transformer. The controller further controls entry and exit into a low-power mode in which converter oscillations are suppressed.
    Type: Application
    Filed: March 24, 2011
    Publication date: November 7, 2013
    Inventors: Russell Jacques, Nicolaas van der Duijn Schouten, David Robert Coulson
  • Patent number: 8564974
    Abstract: In a switching power source of a flyback converter system according to the present invention, large electric power can be applied, by reducing loss of a switching element, a coil, and an output smoothing circuit, input voltage is applied to a primary coil of a transformer, and switching drive of the input voltage is carried out by a switching element, so that direct-current electric power is outputted from a secondary coil of the transformer through a rectifier circuit. The power source apparatus includes a trigger-control circuit which detects direct-current output voltage to control an “on” period, detects that current of the secondary coil becomes zero based on a voltage signal from a control coil, and turns on the switching element, and a timer circuit which is operated according to the voltage signal of the control coil, and gives an ON signal to the trigger-control circuit according to a timing signal.
    Type: Grant
    Filed: January 16, 2008
    Date of Patent: October 22, 2013
    Assignee: Shindengen Electric Manufacturing Co., Ltd.
    Inventor: Shigeru Hisada
  • Patent number: 8538529
    Abstract: Method and apparatus for converting the output of a thermoelectric generator to voltages compatible with implantable medical devices is provided. One apparatus includes an implantable thermoelectric generator. The apparatus includes an input terminal for receiving an input voltage generated by a thermoelectric energy converter and a charging inductor connected in series with the input terminal. The apparatus also includes a switching Field Effect Transistor (FET) connected to the inductor, and a capacitor connected to the FET and the input terminal via a diode. The FET is switched with a frequency and duty cycle such that a voltage level at an output terminal is compatible with an implantable medical device. According to various embodiments, the FET is switched using a closed loop feedback system that controls the frequency and duty cycle based on an observed voltage level at the output terminal. Other aspects and embodiments are provided herein.
    Type: Grant
    Filed: March 5, 2007
    Date of Patent: September 17, 2013
    Assignee: Cardiac Pacemakers, Inc.
    Inventors: Kristofer J. James, Blair Erbstoeszer, Glenn Morita
  • Patent number: 8508310
    Abstract: A PWM signal for driving power transistors of a half-bridge of a converter is generated with the aid of a digital circuit, in which an internal reference value is compared to the counter content of a counting ramp. In this context, a logic state of the PWM signal depends upon whether the internal reference value is greater than the counter content of the counting ramp. After each comparison between the internal reference value and the counter content, an n-bit long data word dependent on the result of this comparison is output serially as PWM signal, n being greater than or equal to 2. The resolution of the PWM signal is thereby improved by the factor n in comparison to conventional systems, without markedly increasing the circuit expenditure.
    Type: Grant
    Filed: March 26, 2009
    Date of Patent: August 13, 2013
    Assignee: Etel S.A.
    Inventor: Claude Froidevaux
  • Patent number: 8503197
    Abstract: The power supply apparatus for obtaining a direct current from an alternating voltage source includes a first DC/DC converter for outputting a first direct current and a second DC/DC converter for a second direct current lower than the first direct current from the first DC/DC converter, and the output voltage of the first DC/DC converter is changed to a lower direct current and the second DC/DC converter is driven in a continuously-conducting state.
    Type: Grant
    Filed: November 30, 2009
    Date of Patent: August 6, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventors: Minoru Hayasaki, Keisuke Samejima
  • Patent number: 8482229
    Abstract: The present invention relates to a method for charging accumulation means via an external electrical network via at least a first (A) and a second (B) switching arm respectively comprising two switches (12), said method comprising a step for controlling the switches (12) of the switching arms (A, B) by transmission of pulse width modulation control signals, characterized in that the switches (12) of the second switching arm (B) are controlled by adapting the pulse width of the control signals so as to generate an alternating voltage (Vx) in phase opposition relative to the voltage at the terminals of a compensation inductance (7?) connected on the one hand to the second arm (B) and on the other hand to the neutral (N) of said network, so that the voltage (VN) between the neutral (N) of said network and ground is a direct voltage. The invention also relates to a charging device for implementing such a charging method.
    Type: Grant
    Filed: June 21, 2011
    Date of Patent: July 9, 2013
    Assignee: Valeo Systemes de Controle Moteur
    Inventors: Boris Bouchez, Luis De Sousa
  • Patent number: 8441237
    Abstract: Consistent with an example embodiment, a circuit comprises a power factor correction stage having a DC input, a ground input, a DC output and a ground output. The circuit further includes a capacitor; a diode; and a discharge circuit. A first terminal of the diode is connected to an input of the power factor correction stage, a second terminal of the diode is connected to the first plate of the capacitor; and the second plate of the capacitor is connected to the other input of the PFC stage. The discharge circuit is connected to the capacitor and is configured to discharge the capacitor such that it contributes to the output of the PFC stage when the level of a signal at the input of the PFC stage falls below a threshold value.
    Type: Grant
    Filed: December 29, 2010
    Date of Patent: May 14, 2013
    Assignee: NXP B.V.
    Inventors: Markus Schmid, Johann Baptist Daniel Kuebrich, Thomas Antonius Duerbaum, Gian Hoogzaad, Peter Laro, Frans Pansier
  • Patent number: 8437151
    Abstract: There is provided a self-excited switching power supply circuit which shifts to continuous oscillating operation immediately after the self-excited switching power supply circuit is connected to an AC power supply and started and which does not cause start-up failure while using a start-up resistor of a high resistance value to maintain standby power consumption at a low level. A bypass charging circuit connected in series to a start-up resistor is connected between a high-voltage side terminal of a DC input power supply and the gate of an oscillation field effect transistor. A charging current flowing in the start-up resistor, and additionally, a charging current to charge a start-up capacitor through the bypass charging circuit flow in a transitional period during which the voltage of the DC input power supply increases.
    Type: Grant
    Filed: March 7, 2012
    Date of Patent: May 7, 2013
    Assignee: SMK Corporation
    Inventors: Katsuhiko Okitsu, Toshihiro Amei, Kenji Hatano
  • Publication number: 20130094248
    Abstract: A power converter controller and methods for its operation are provided that can control a self-oscillating power converter that uses a Bipolar Junction Transistor (BJT) as a switch by manipulating the current flowing in a control winding. The controller is able to determine the optimum time to remove a short circuit applied to the control winding, as well as being able to determine the optimum time to pass current through the control winding. The controller can further draw power from the power converter using the control winding. The controller is capable of maintaining the midpoint voltage of the power converter in the case that the converter has more than one switch. The controller estimates the output power of the converter without requiring a connection to the secondary side of the converter transformer. The controller further controls entry and exit into a low-power mode in which converter oscillations are suppressed.
    Type: Application
    Filed: March 26, 2011
    Publication date: April 18, 2013
    Inventors: Russell Jacques, Nicolaas van der Duijn Schouten, David Robert Coulson
  • Patent number: 8411467
    Abstract: A circuit for boosting the voltage from a very low level voltage source to a higher level voltage output utilizing self-oscillation.
    Type: Grant
    Filed: April 21, 2010
    Date of Patent: April 2, 2013
    Assignee: TXL Group, Inc.
    Inventors: Edward Rubio, Stanley Simon Hirsh, David Charles Nemir
  • Patent number: 8395347
    Abstract: In an induction motor group control system, magnetic energy recovery switches (3) are connected in series to an induction motor (2) directly driven by a commercial power supply, and a plurality of induction motor control devices (10) enabling voltage control and reactive power control of the induction motor 2 are employed to control generation of reactive power so as to maximize a power factor of the entire plurality of AC loads including the induction motor or compensate variations in voltage of an AC power supply (1).
    Type: Grant
    Filed: March 10, 2010
    Date of Patent: March 12, 2013
    Inventors: Kazuhiko Fukutani, Hideo Narisawa, Ryuichi Shimada, Takanori Isobe, Tadayuki Kitahara
  • Publication number: 20120230061
    Abstract: There is provided a self-excited switching power supply circuit which shifts to continuous oscillating operation immediately after the self-excited switching power supply circuit is connected to an AC power supply and started and which does not cause start-up failure while using a start-up resistor of a high resistance value to maintain standby power consumption at a low level. A bypass charging circuit connected in series to a start-up resistor is connected between a high-voltage side terminal of a DC input power supply and the gate of an oscillation field effect transistor. A charging current flowing in the start-up resistor, and additionally, a charging current to charge a start-up capacitor through the bypass charging circuit flow in a transitional period during which the voltage of the DC input power supply increases.
    Type: Application
    Filed: March 7, 2012
    Publication date: September 13, 2012
    Applicants: SMK CORPORATION, CANON DENSHI KABUSHIKI KAISHA
    Inventors: Katsuhiko OKITSU, Toshihiro AMEI, Kenji HATANO
  • Patent number: 8264858
    Abstract: A technique for controlling a power supply with power supply control element with a tap element. An example power supply control element includes a power transistor that has first and second main terminals, a control terminal and a tap terminal. A control circuit is coupled to the control terminal. The tap terminal and the second main terminal of the power transistor are to control switching of the power transistor. The tap terminal is coupled to provide a signal to the control circuit substantially proportional to a voltage between the first and second main terminals when the voltage is less than a pinch off voltage. The tap terminal is coupled to provide a substantially constant voltage that is less than the voltage between the first and second main terminals to the control circuit when the voltage between the first and second main terminals is greater than the pinch-off voltage.
    Type: Grant
    Filed: February 17, 2012
    Date of Patent: September 11, 2012
    Assignee: Power Integrations, Inc.
    Inventor: Donald R. Disney
  • Patent number: 8250358
    Abstract: A data diode system enables one-way data flow from an unsecured device to a secured device is disclosed. The data diode system includes at least one data diode that convert a communication received from an unsecured device to a secured communication for transmission to the secured device. The data diode system includes a voltage converter that receives a negative voltage from a serial data port connection of the secured device. The voltage converter converts the negative voltage into a positive voltage in order to power the data diode.
    Type: Grant
    Filed: April 1, 2009
    Date of Patent: August 21, 2012
    Assignee: Raytheon Company
    Inventor: Kelvin Y. Cheng
  • Patent number: 8237415
    Abstract: An output voltage monitoring circuit monitors an output voltage of a capacitor charging circuit. A first sample-and-hold circuit samples and holds a voltage of a connection point of a primary coil of a transformer and a switching transistor. A first monitoring comparator compares output of the first sample-and-hold circuit with a predetermined first reference voltage. When the output of the first sample-and-hold circuit exceeds the first reference voltage, a signal processor executes predetermined signal processing. The first sample-and-hold circuit starts a sampling period after a predetermined first time has elapsed after the switching transistor is turned OFF. When a voltage drop across a detection resistor reaches a third reference voltage, the first sample-and-hold circuit ends the sampling period.
    Type: Grant
    Filed: October 22, 2008
    Date of Patent: August 7, 2012
    Assignee: Rohm Co., Ltd.
    Inventors: Tatsuya Iwasaki, Isao Yamamoto
  • Publication number: 20120087154
    Abstract: A voltage supply device for a load, in particular for a network, has an energy store that can be connected to connection terminals and a voltage transformer with at least one electronic switch. A reverse polarity protection is in contact with the connection terminals and is designed to convert voltage delivered from the energy store into control voltage for active activation of the electronic switch when the polarity of the voltage is reversed.
    Type: Application
    Filed: December 16, 2009
    Publication date: April 12, 2012
    Inventors: Peter Maisel, Martin Saliternig
  • Patent number: 8144484
    Abstract: A technique for controlling a power supply with power supply control element with a tap element. An example power supply control element includes a power transistor that has first and second main terminals, a control terminal and a tap terminal. A control circuit is coupled to the control terminal. The tap terminal and the second main terminal of the power transistor are to control switching of the power transistor. The tap terminal is coupled to provide a signal to the control circuit substantially proportional to a voltage between the first and second main terminals when the voltage is less than a pinch off voltage. The tap terminal is coupled to provide a substantially constant voltage that is less than the voltage between the first and second main terminals to the control circuit when the voltage between the first and second main terminals is greater than the pinch-off voltage.
    Type: Grant
    Filed: November 25, 2009
    Date of Patent: March 27, 2012
    Assignee: Power Integrations, Inc.
    Inventor: Donald R. Disney
  • Patent number: 8115408
    Abstract: A light source apparatus and a light source adjusting module are provided. The light source apparatus includes a power supply, a phase modulator, an electrical transformer, a light source adjusting module and a light-emitting device. The power supply provides a first AC voltage signal. The phase modulator receives the first AC voltage signal and adjusts a conducting phase of the first AC voltage signal to generate a modulated AC voltage signal. The electrical transformer transforms the modulated AC voltage signal to generate a second AC voltage signal. The light adjusting module generates a luminance adjusting signal according to a state of the second AC voltage signal. The light-emitting device receives the luminance adjusting signal to generate a corresponding light source.
    Type: Grant
    Filed: November 18, 2008
    Date of Patent: February 14, 2012
    Assignee: Novatek Microelectronics Corp.
    Inventors: Yi-Te Liu, Chih-Jen Yen, Chih-Yuan Hsieh, Lan-Shan Cheng
  • Patent number: 8072782
    Abstract: The device (10) comprises an energy-storage transformer (14) having magnetically coupled primary and secondary windings (P and L1, L2, L3); a primary circuit (20) connecting the power supply source to a ground (M), and comprising the primary winding (P) and a static main switch (22) connected in series; a secondary winding (S1, S2, S3) designed to be connected to a load, and including the secondary winding (L1, L2, L3); and voltage control means (34) for controlling the static main switch (22) and comprising a first static control switch (36) connecting a control terminal (22A) of the static main switch (22) to ground (M).
    Type: Grant
    Filed: April 21, 2009
    Date of Patent: December 6, 2011
    Assignee: Valeo Etudes Electroniques
    Inventor: Pierre Sardat
  • Patent number: 8071232
    Abstract: To provide a hybrid fuel cell system for improving converter efficiency. In a hybrid fuel cell system (1) in which a fuel cell (22) and an electricity storage device (21) are connected via a voltage converter (20), the voltage converter (20) has a plurality of phases (P1, P2, P3), and the number of phases of operation can be changed in accordance with the power passing through the voltage converter (20). As the number of phases can be changed in accordance with the power passing through the voltage converter (20), it is possible to select the number of phases that give a higher efficiency voltage conversion in accordance with the passing power, and the efficiency of the voltage converter (20) can be greatly improved.
    Type: Grant
    Filed: February 2, 2005
    Date of Patent: December 6, 2011
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Tetsuhiro Ishikawa, Tsuyoshi Yano, Hiroshi Yoshida
  • Patent number: 8072203
    Abstract: A method and system for regulating electrical power from a non-perpetual power source. In one implementation, the method includes receiving a variable power output from the non-perpetual power source, wherein a power amplitude of the variable power output substantially varies over time; and generating a regulated current output or a regulated voltage output based in part on the variable power output received from the non-perpetual power source.
    Type: Grant
    Filed: December 13, 2007
    Date of Patent: December 6, 2011
    Inventor: Marcellus Chen
  • Patent number: 8035998
    Abstract: A switching power supply includes an active device for pulling out a part of a control signal from a control terminal of the switching device in an RCC, and a control signal generation circuit that applies adjustment voltage as ON/OFF time control voltage to a control terminal of the active device. The active device pulls out the control signal so as to decrease or increase an OFF time of the switching device while fixing the ON time of the switching device when the adjustment voltage is decreased or increased in the active region of the active device, respectively. An element of a timing circuit in the RCC pulls out the control signal so as to increase or decrease an ON time of the switching device while fixing the OFF time of the switching device when the adjustment voltage is decreased or increased in the cut-off region of the active device, respectively.
    Type: Grant
    Filed: June 29, 2007
    Date of Patent: October 11, 2011
    Assignee: Panasonic Electric Works Co., Ltd.
    Inventors: Kyohei Kada, Mikio Itou, Sumio Wada, Shousuke Akisada, Atsushi Isaka, Kenji Obata
  • Patent number: 8035999
    Abstract: An isolating self-oscillation flyback converter includes a coupling transformer T1, a FET TR1, a transistor TR2, a photoelectric coupling isolator OC1 and a load feedback circuit Adj. The common polarity terminal of a feedback winding Nfb of the coupling transformer T1 is connected to the gate of the FET TR1 via a capacitance C1 and a resistance R2, and connected to the base of the transistor TR2 via a capacitance C2. The base of the transistor TR2 is also connected to the emitter of the photoelectric coupling isolator OC1. The photoelectric coupling isolator OC1 is connected to the positive terminal of the output voltage. The opposite polarity terminal of the feedback winding Nfb is connected to the collector of the photoelectric coupling isolator OC1 via a resistance R5, and connected to ground via a capacitance C5. The common polarity terminal of the feedback winding Nfb is also connected to the cathode of a diode D, and the anode of the diode D is connected to ground.
    Type: Grant
    Filed: August 27, 2007
    Date of Patent: October 11, 2011
    Assignee: Mornsun Guangzhou Science & Technology Limited
    Inventors: Jiangjian Huang, Jianfeng Song
  • Patent number: 8014174
    Abstract: The present invention can include an image forming apparatus having an electrical load, a supplying circuit configured to supply an electrical power to the electrical load, and an output circuit configured to output a voltage according to a current value of the electrical power being supplied to the electrical load. The present invention may also provide for a controller configured to control an electrical current flowing in the electrical load based on an output voltage value of the output circuit as a feedback value, and an inhibiting circuit configured to inhibit a reverse current to flow in the output circuit when the supplying circuit is turned off.
    Type: Grant
    Filed: May 22, 2008
    Date of Patent: September 6, 2011
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventor: Katsumi Inukai
  • Patent number: 7999516
    Abstract: Circuits and methods for battery charging are disclosed. In one embodiment, the battery charging circuit comprises an AC to DC converter, a charging control switch, and a charger controller. The AC to DC converter provides a charging power to a battery pack. The charging control switch is coupled between the AC to DC converter and the battery pack. The charging control switch transfers the charging power to the battery pack. The charger controller detects a battery status of the battery pack and controls the charging control switch to charge the battery pack in a continuous charging mode or a pulse charging mode according to the battery status. The charger controller also controls the AC to DC converter to regulate the charging power according to the battery status.
    Type: Grant
    Filed: June 28, 2010
    Date of Patent: August 16, 2011
    Assignee: 02Micro International Limited
    Inventors: Alexandru Hartular, Eftimie Caraghiorghiopol, Dan Simon
  • Patent number: 7965523
    Abstract: In a switching power supply device, a first switch element, which defines a main switch element of a DC-DC converter, and a third switch element, which defines a switch element of a power-factor correcting circuit, are controlled such that turn-on timings are synchronized while on-period control is independently performed to thereby prevent an increase in switching frequency and prevent noise by eliminating intermittent oscillation. Thus, it is possible to prevent intermittent oscillation control due to an increase in switching frequency of the first switch element under a light load state or a no load state. This eliminates problems of the frequency of intermittent oscillation that falls within an audible frequency range causing noise and increasing ripple voltage.
    Type: Grant
    Filed: September 1, 2009
    Date of Patent: June 21, 2011
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Naoki Yamaguchi, Tatsuya Hosotani, Takuji Yokawa