Including Means For Reducing Ripples From The Output Patents (Class 363/45)
  • Patent number: 10312800
    Abstract: An AC-DC converter that converts a rectified voltage of an AC power supply AC to a DC output voltage by switching ON and OFF a switching device and controls the switching device by using a command value for and a detected value of the DC output voltage as well as a detected value of a reactor current includes: a current sense resistor and a low-pass filter for detecting a rectified current; a proportional controller that multiplies the detected value of the rectified current by a prescribed gain; an output voltage command calculator such as a divider that calculates an output voltage command for the switching device on the basis of an output of the proportional controller; and a circuit that compares the output voltage command to a carrier signal in order to generate a gate signal for the switching device, wherein the prescribed gain is effectively adjusted on the basis of a difference signal between a command value for and a detected value of the DC output voltage.
    Type: Grant
    Filed: September 6, 2018
    Date of Patent: June 4, 2019
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventor: Ryuji Yamada
  • Patent number: 10256583
    Abstract: A power adapter including a main circuit board and an auxiliary circuit board is provided. The main circuit board has a first surface and a second surface opposite to each other, and the first surface of the main circuit board is configured with a transformer and a first capacitor. The auxiliary circuit board has a first surface and a second surface opposite to each other, and the first surface of the auxiliary circuit board is configured with an input rectifier filter circuit, where the auxiliary circuit board is disposed in parallel above the main circuit board, and the input rectifier filter circuit of the auxiliary circuit board is electrically connected to the first capacitor of the main circuit board. Under a condition of same electrical parameters and dimensions, the volume of the power adapter of the invention is only a half of that of the existing power adapter, which satisfies a demand for miniaturization of the electronic devices.
    Type: Grant
    Filed: July 6, 2016
    Date of Patent: April 9, 2019
    Assignee: FSP TECHNOLOGY INC.
    Inventor: Kuo-Fan Lin
  • Patent number: 9941810
    Abstract: A power conversion device includes a rectifier circuit that converts an AC power from an AC power supply, into a DC power, a short-circuit unit that short-circuits the AC power supply via a reactor connected between the AC power supply and the rectifier circuit, a control unit that generates a plurality of drive signals to control the short-circuit unit in a half cycle of the AC power supply, and a smoothing capacitor. The control unit stepwise varies threshold values that limit a value of a power-supply current of the AC power supply, in an on-section or an off-section of the plurality of drive signals.
    Type: Grant
    Filed: July 8, 2014
    Date of Patent: April 10, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Koichi Arisawa, Takashi Yamakawa, Yuji Takayama, Takuya Shimomugi, Yosuke Shinomoto
  • Patent number: 9941834
    Abstract: A power conversion apparatus, including: an MLC circuit configured to boost an input voltage from a three-phase rectifier; a smoothing capacitor configured to smooth an output of the MLC circuit; an inverter control unit configured to generate a PWM signal; an inverter circuit configured to convert a DC voltage of the smoothing capacitor into an AC voltage based on an input of the PWM signal and to supply the AC voltage to a motor; a boost mode switching unit having at least three boost modes in which a boost level of the input voltage is selected and configured to switch among the at least three boost modes depending on an operation status of the motor determined for the purpose of controlling a refrigeration cycle; and an MLC control unit configured to control the MLC circuit based on the switching by the boost mode switching unit.
    Type: Grant
    Filed: July 3, 2014
    Date of Patent: April 10, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Keiwa Tsukano, Akihiko Iwata, Shinsaku Kusube, Kenta Yuasa, Akihiro Tsumura
  • Patent number: 9923451
    Abstract: A configurable impedance circuit is provided, including a filter for filtering a received DC voltage and a controller. The filter includes a first capacitor, a second capacitor, and a selectable switch coupled in series with the second capacitor and coupled to receive a control signal. The selectable switch and the second capacitor are selectively coupled in parallel with the first capacitor. The controller is connected to sense a differential voltage across the second capacitor and configured to generate the control signal to open or close the selectable switch based on the differential voltage across the second capacitor, so as to maintain a voltage range across the second capacitor. According to disclosure of the present invention, the total physical size of the capacitors is reduced and the size of the power supply is reduced accordingly.
    Type: Grant
    Filed: April 11, 2016
    Date of Patent: March 20, 2018
    Assignee: Futurewei Technologies, Inc.
    Inventors: Liming Ye, Heping Dai, Dianbo Fu
  • Patent number: 9800077
    Abstract: The DC power-supply device includes a rectifier circuit rectifying an alternating current, a reactor connected to an input or output side of the rectifier circuit, a first capacitor and a second capacitor serially connected between output terminals to a load, and a charging unit that selectively charges one or both of the first capacitor and the second capacitor. A ratio, to a period obtained by combining a charging period and a non-charging period of a pair of the first capacitor and the second capacitor, of the non-charging period, is controlled according to an operating condition of the load, to change a charging frequency of the first capacitor and the second capacitor based on the ratio, at the time of controlling an output voltage to the load.
    Type: Grant
    Filed: November 26, 2013
    Date of Patent: October 24, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kazunori Hatakeyama, Keisuke Uemura, Yosuke Shinomoto
  • Patent number: 9307586
    Abstract: Techniques and corresponding circuitry and drivers are disclosed for improving power factor (PF) and total harmonic distortion (THD) of a flyback power factor correction (PFC) topology operating in transition-mode. In one or more embodiments, the PF and THD are improved by correcting the on-time of the switching element of the flyback PFC topology to actively shape the wave of the PFC input current. In some embodiments, the on-time is corrected using a phase-lock-loop module that synchronizes with the rectified input line voltage signal and a output regulator module that corrects the switch on-time. The control may be implemented using a digital or an analog controller.
    Type: Grant
    Filed: July 26, 2013
    Date of Patent: April 5, 2016
    Assignee: OSRAM SYLVANIA Inc.
    Inventors: Afroz Imam, Biju Antony
  • Patent number: 9184654
    Abstract: An assembly for converting an assembly input AC voltage to an assembly output AC voltage may include: plural converters, each including a rectifier stage for rectifying an input AC voltage to a DC voltage, the rectifier including: first and second input terminals between which the input AC voltage is applied; first and second thyristors connected in series, wherein the first input terminal is connected between the first and second thyristors; first and second diodes connected in series, wherein the second input terminal is connected between the first and second diodes; and first and second output terminals between which the DC voltage is achieved, wherein the first thyristor and the first diode are connected to the first output terminal, and the second thyristor and the second diode are at least indirectly connected to the second output terminal.
    Type: Grant
    Filed: December 2, 2011
    Date of Patent: November 10, 2015
    Assignee: SIEMENS AKTIENGESELLSCHAFT
    Inventor: Asle Einar Skjellnes
  • Patent number: 9160276
    Abstract: The present invention relates to an adaptable RF impedance translation circuit that includes a first group of inductive elements cascaded in series between an input and an output without any series switching elements, a second group of inductive elements cascaded in series, and a group of switching elements that are capable of electrically coupling the first group of inductive elements to the second group of inductive elements. Further, the adaptable RF impedance translation circuit includes at least one variable shunt capacitance circuit electrically coupled between a common reference and at least one connection node in the adaptable RF impedance translation circuit, which includes control circuitry to select either an OFF state or an ON state associated with each of the switching elements and to select a capacitance associated with each variable shunt capacitance circuit to control impedance translation characteristics of the adaptable RF impedance translation circuit.
    Type: Grant
    Filed: May 2, 2013
    Date of Patent: October 13, 2015
    Assignee: RF Micro Devices, Inc.
    Inventors: Marcelo J. Franco, David C. Dening, Robert J. Baeten
  • Patent number: 9154047
    Abstract: A rectifier system, e.g., for a generator, includes a bridge system having a predefined number of rectifier elements, at least one rectifier element being a rectifier element having at least one reverse-voltage dependent characteristic curve in a predefined range, and one of the negative diodes having a higher reverse saturation current than the associated positive diode, and at least one of the negative diodes being placed at a location in the rectifier in which the temperature is increased.
    Type: Grant
    Filed: June 9, 2010
    Date of Patent: October 6, 2015
    Assignee: ROBERT BOSCH GMBH
    Inventors: Michael Wohlfarth, Alfred Goerlach
  • Patent number: 9143035
    Abstract: Aspects of the invention include a switching power supply device that includes a zero current detecting circuit that detects zero current of electric current flowing through the inductor to turn ON the switching element, an ON width generating circuit that determines the ON width of the switching element to turn OFF the switching element, and an OFF width detecting circuit that detects the OFF width of the switching element based on the output of the ON width generating circuit and the output of the zero current detecting circuit, and holds the OFF width until the next operating cycle. Aspects of the invention also include an ON width adjusting circuit that is included in the ON width generating circuit and adjusts the ON width of the switching element in the next operation cycle according to the width detected by the OFF width detecting circuit.
    Type: Grant
    Filed: April 11, 2013
    Date of Patent: September 22, 2015
    Assignee: FUJI ELECTRONIC CO., LTD.
    Inventor: Jian Chen
  • Patent number: 9001536
    Abstract: A voltage smoothing circuit is configured to smooth a voltage outputted from a power supply portion. The voltage smoothing circuit includes first and second smoothing capacitors, a first balancing resistor, and a second conduction regulating portion. The first smoothing capacitor and the second smoothing capacitor are connected in series to each other and are connected in parallel to the power supply portion. The first balancing resistor is connected in parallel to the first smoothing capacitor. The second conduction regulating portion is connected on a current path in parallel with the second smoothing capacitor and conducts current in one direction on the current path in a case where a voltage equal to or greater than a second predetermined voltage has been applied.
    Type: Grant
    Filed: August 5, 2010
    Date of Patent: April 7, 2015
    Assignee: Daikin Industries, Ltd.
    Inventors: Sumio Kagimura, Masafumi Hashimoto, Hiroshi Dohmae, Hirotaka Doi, Toshiaki Sato, Shinichi Ishizeki
  • Patent number: 8975847
    Abstract: A power conversion device includes a first capacitor connected in parallel to a direct-current power supply, plural power converters that drive plural synchronous machines, a second capacitor connected in parallel to a direct-current side of power converters, a switching circuit inserted between the first and second capacitors, a switch-start instruction unit that controls starting of an operation of the power converters, and a control unit that controls the power converters based on a motor velocity and a voltage of the first capacitor. The switch-start instruction unit turns off the switching circuit while the power converters stop, turns off the switching circuit until a terminal voltage of each of the synchronous machines becomes equal to a predetermined value when each of the power converters starts operating, and turns on the switching circuit when the terminal voltage of each synchronous machine becomes equal to or smaller than the predetermined value.
    Type: Grant
    Filed: March 26, 2010
    Date of Patent: March 10, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventor: Masaki Kono
  • Patent number: 8976548
    Abstract: In one aspect, the present invention reduces electromagnetic interference (EMI) caused by a capacitive dropper power supply by synchronizing the openings and closings of a shunt switched used for regulation control of the DC output voltage generated by the power supply, to zero crossings of AC current from the current-limiting resistor disposed in series at the AC input of the power supply. In one or more other embodiments, the capacitive dropper power supply includes disconnect circuitry that senses a loss of the input AC voltage source and in response wholly or partly disconnects internal regulation control circuitry from the supply's output filter capacitor to reduce the current drawn from the filter capacitor, thereby reducing the decay rate of the DC output voltage from the filter capacitor. The contemplated power supply may also be implemented in a Bipolar, BiCMOS or CMOS process, for realization in a compact integrated circuit device.
    Type: Grant
    Filed: August 21, 2013
    Date of Patent: March 10, 2015
    Assignee: Sensus USA, Inc.
    Inventors: William H. Laletin, Robert Rouquette, H. Britton Sanderford, Jr.
  • Publication number: 20150016156
    Abstract: A boosting AC-to-DC converter may include a main rectifier, first and second auxiliary rectifiers, and an autotransformer. The autotransformer may include a plurality of winding assemblies each having a primary terminal connected to an AC power source, a main secondary terminal connected to the main rectifier, a first auxiliary secondary terminal connected to the first auxiliary rectifier, and a second auxiliary secondary terminal connected to the second auxiliary rectifier. Impedance between the primary terminal of each of the winding assemblies and the main rectifier is less than impedance between the primary terminal of each of the winding assemblies and either the first auxiliary rectifier or the second auxiliary rectifier. Impedance between the primary terminal of each of the first winding assemblies and the first auxiliary rectifier is different from impedance between the primary terminal of each of the winding assemblies and the second auxiliary rectifier.
    Type: Application
    Filed: July 10, 2013
    Publication date: January 15, 2015
    Inventors: Evgeni Ganev, William Warr, Keming Chen
  • Publication number: 20150009728
    Abstract: In a DC power supply circuit, a first period and a second period are alternately repeated a plurality of times during each half cycle of AC supplied to the DC power supply circuit. The first period is a period during which current flows along a first current path extending from an output terminal at a high-potential side of a rectifier circuit to an output terminal at a low-potential side of the rectifier circuit, via an inductor and a switching element. The second period is a period during which current flows along a second current path extending from the output terminal at the high-potential side of the rectifier circuit to the output terminal at the low-potential side of the rectifier circuit, via the inductor, a charging current supply path, and a capacitor.
    Type: Application
    Filed: October 18, 2012
    Publication date: January 8, 2015
    Inventors: Kazushige Sugita, Kazuhiko Itoh, Masanobu Murakami
  • Publication number: 20140369092
    Abstract: A method is disclosed for reducing input current harmonic distortion in a Vienna-type active rectifier that includes the steps of sensing voltage values from upper and lower halves of a DC bus associated with the rectifier, determining an average of the sensed voltage values, calculating upper and lower scale factors by dividing the sensed voltage values with the averaged sensed voltage value, rescaling a reference signal from a controller using the upper and lower calculated scale factors, and forward feeding the rescaled reference signal from the controller to a pulse width modulator to obtain a gate driver signal for power semiconductor switches of the rectifier.
    Type: Application
    Filed: June 14, 2013
    Publication date: December 18, 2014
    Applicant: Hamilton Sundstrand Corporation
    Inventor: Vietson M. Nguyen
  • Patent number: 8907604
    Abstract: An optimized pseudo-random period pattern can reduce audible noise in a system that includes an inverter circuit configured to provide power to an electric machine. A system can include a PWM optimization module (POM) comprising the PPP. A carrier period for a carrier signal used to provide PWM inverter drive signals can be selected in accordance with the PPP. The PPP can be expressed as an array of 200-400 elements, each element a period belonging to a finite set of 2 or more predetermined periods. A period can be selected by index from the array, and the index incremented to progress through the PPP, which can be repeated upon its completion. The PPP can be optimized to reduce audible noise while mitigating inverter losses. Modeling techniques can determine the number of array elements, the number of possible periods, and the period values that optimize the PPP.
    Type: Grant
    Filed: February 7, 2012
    Date of Patent: December 9, 2014
    Assignee: Ford Global Technologies, LLC
    Inventors: Jami J. Miller, Michael W. Degner, Scott Xiong Yu, William C. Reynolds
  • Patent number: 8873263
    Abstract: A dual-input 18-pulse autotransformer rectifier unit for more electric aircraft AC-DC converter uses an autotransformer with a nine-phase output to condition AC power prior to DC rectifying the AC power.
    Type: Grant
    Filed: April 17, 2012
    Date of Patent: October 28, 2014
    Assignee: Hamilton Sunstrand Corporation
    Inventors: Frank Z. Feng, Mustansir Kheraluwala, Waleed M. Said, John Huss
  • Patent number: 8824175
    Abstract: A power circuit, in certain embodiments, includes an inductor to limit current through a capacitor, wherein the capacitor is configured to smooth ripple for a constant voltage welding system. More specifically, the power circuit may include a rectifier configured to convert AC power to DC power. The rectifier may be coupled to a DC bus configured to transmit the DC power. A capacitive circuit having the capacitor may be coupled across the DC bus to smooth ripple in the DC power. The inductor, e.g., coupled between the DC bus and the capacitive circuit, limits the rate of current flow between the capacitive circuit and the DC bus during a welding operation, thereby reducing heating in the output capacitive circuit. A further inductor may be coupled to one side of the DC bus to stabilize the rate of current flow from the power circuit to a load.
    Type: Grant
    Filed: February 13, 2008
    Date of Patent: September 2, 2014
    Assignee: Illinois Tool Works Inc.
    Inventors: Darrell L. Sickels, Bernard J. Vogel
  • Patent number: 8811048
    Abstract: The present invention provides a medium voltage variable frequency driving system, including a three-phase switch-mode rectification module, a multilevel inverter and a high-capacity capacitor module. The three-phase switch-mode rectification module is coupled with a three-phase electrical grid, for converting an AC voltage input with a fixed operating frequency on the three-phase electrical grid into a DC voltage. The multilevel inverter is used for converting the DC voltage into an AC voltage with a required variable frequency, so as to drive an induction motor. The high-capacity capacitor module is coupled between the three-phase switch-mode rectification module and the multilevel inverter, for temporarily storing the DC voltage. In the present invention, a three-phase switch-mode rectification technology is used at the front-end rectifier, and a diode-clamped three-level inverter is adapted correspondingly at the rear-end inverter.
    Type: Grant
    Filed: November 10, 2011
    Date of Patent: August 19, 2014
    Assignee: Delta Electronics (Shanghai) Co., Ltd.
    Inventors: Yi Zhang, Wei Chen, Bo-Yu Pu
  • Publication number: 20140186066
    Abstract: A power supply system includes: a switching power supply configured to rectify and smooth an AC voltage of an AC power supply to generate a predetermined DC voltage; a low-capacity power supply circuit that generates a zero-cross detection signal corresponding to zero-cross points of the AC power supply based on a rectified current flowing in a smoothing capacitor; and a controller configured to receive the zero-cross detection signal from the signal generating circuit and perform a determining process of determining whether it is possible to perform detection process of the zero-cross points based on a voltage value of the zero-cross detection signal. If the control unit determines that it is possible to perform the detection process of the zero-cross points, the control unit performs a zero-cross point detecting process of detecting the zero-cross points based on the zero-cross detection signal.
    Type: Application
    Filed: September 26, 2013
    Publication date: July 3, 2014
    Applicant: BROTHER KOGYO KABUSHIKI KAISHA
    Inventor: Katsumi INUKAI
  • Patent number: 8736204
    Abstract: Apparatus for transferring power between an electricity network (UP) operating on alternating-current electricity and a multiphase electric machine (M2, M3), which apparatus comprises low-voltage power cells (CS, C11 . . . CN6) operating on a cascade principle, which power cells comprise a single-phase output connector (OUT), and at least one transformer (TA, T1 . . . TN), comprising for each power cell connected to it a single-phase or multiphase winding dedicated to the specific power cell, which transformer comprises at least one additional winding (WA, WB1 . . . WBN) connected to the same magnetic circuit as the other windings for the purpose of at least one auxiliary circuit, which can be connected to the aforementioned additional winding.
    Type: Grant
    Filed: January 3, 2012
    Date of Patent: May 27, 2014
    Assignee: Vacon Oyj
    Inventors: Nicklas Södö, Risto Komulainen
  • Publication number: 20140119070
    Abstract: Disclosed herein is a power factor correction circuit, including: a boost converter circuit in which a plurality of boost circuits including a boost inductor, a rectifying diode, and a boost switch are connected with each other; and a snubber circuit including a snubber inductor and a snubber switch so as to snubber the boost converter circuit. The snubber inductor is controlled so as to be turned on before the boost inductor is turned on to apply zero voltage to the boost inductor. It is possible to reduce switching loss occurring when the boost switch is turned on and increase efficiency of an AC-DC power supply apparatus.
    Type: Application
    Filed: February 8, 2013
    Publication date: May 1, 2014
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: In Wha Jeong, Kee Ju Um, Bum Seok Suh, Kwang Soo Kim, Min Gyu Park
  • Publication number: 20140098580
    Abstract: A power control circuit for a power supply system including a control unit, a driving circuit and a power supply unit is disclosed. The power control circuit includes a current detection unit, a voltage detection unit and a power detection unit. The current detection unit is used for detecting a current signal. The voltage detection unit is used for detecting a voltage signal. The power detection unit is connected with the current detection unit, the voltage detection unit and the control unit for acquiring a power signal according to the current signal and voltage signal. By comparing an adjustable power reference signal with the power signal, the control unit issues a control signal to the driving circuit. In response to the control signal, the power supply unit is driven by the driving circuit to output an adjusted power to the load according to the adjustable power reference signal.
    Type: Application
    Filed: January 8, 2013
    Publication date: April 10, 2014
    Applicant: DELTA ELECTRONICS, INC.
    Inventors: Yen-Ming Liu, Cheng-Chang Huang, Hui-Hsin Lin
  • Publication number: 20140056039
    Abstract: In one aspect, the present invention reduces electromagnetic interference (EMI) caused by a capacitive dropper power supply by synchronizing the openings and closings of a shunt switched used for regulation control of the DC output voltage generated by the power supply, to zero crossings of AC current from the current-limiting resistor disposed in series at the AC input of the power supply. In one or more other embodiments, the capacitive dropper power supply includes disconnect circuitry that senses a loss of the input AC voltage source and in response wholly or partly disconnects internal regulation control circuitry from the supply's output filter capacitor to reduce the current drawn from the filter capacitor, thereby reducing the decay rate of the DC output voltage from the filter capacitor. The contemplated power supply may also be implemented in a Bipolar, BiCMOS or CMOS process, for realization in a compact integrated circuit device.
    Type: Application
    Filed: August 21, 2013
    Publication date: February 27, 2014
    Inventors: William H. Laletin, Robert Rouquette, H. Britton Sanderford, JR.
  • Patent number: 8659919
    Abstract: A circuit to improve the power factor of a power supply at light load, the circuit including a rectifier bridge, a filter positioned before or after the rectifier bridge, a logic control and power drive circuit, a switching transistor, a light load detecting circuit configured to output a control signal to the logic control and power drive circuit which controls the switching transistor to conduct when a heavy load is experienced and to cut off when a light load is experienced, in order to control the working status of the filter capacitor, and a power factor correction circuit.
    Type: Grant
    Filed: October 1, 2010
    Date of Patent: February 25, 2014
    Assignee: Inventronics (Hangzhou), Inc.
    Inventors: Guichao Hua, Xiaoli Yao, Liangan Ge, Lijun Ren
  • Patent number: 8649194
    Abstract: The present invention provides a circuit of reducing electro-magnetic interference for a power converter. The circuit includes an oscillator, a switching voltage divider, and a sample-and-hold circuit. The oscillator has a terminal for receiving a modulation voltage. The modulation voltage is correlated with an input voltage obtained from an input of the power converter. The switching voltage divider is enabled and disabled by a switch to attenuate the input voltage into a sampled voltage in response to a sampling signal. The sample-and-hold circuit receives the sampled voltage to generate the modulation voltage. A switch of the sample-and-hold circuit controlled by a holding signal conducts the sampled voltage to a capacitor of the sample-and-hold circuit to generate the modulation voltage across the capacitor.
    Type: Grant
    Filed: May 8, 2012
    Date of Patent: February 11, 2014
    Assignee: System General Corporation
    Inventor: Ting-Ta Chiang
  • Publication number: 20140035492
    Abstract: Single-phase voltage operation techniques are provided for a three-phase drive system. A drive system may include a rectifier configured to couple to a three-phase AC voltage source. The rectifier may be configured to convert AC voltage from the three-phase AC voltage source to a direct current (DC) voltage. The drive system may also include a controller configured to send a plurality of switching signals to a plurality of switches in the rectifier such that the plurality of switching signals minimizes a current provided to the rectifier when only a single-phase of the three-phase AC voltage source is available.
    Type: Application
    Filed: July 31, 2012
    Publication date: February 6, 2014
    Applicant: Rockwell Automation Technologies, Inc.
    Inventors: Ahmed Mohamed Sayed Ahmed, Lixiang Wei, Brian J. Seibel
  • Patent number: 8619442
    Abstract: A power factor correction circuit responsive to an input power supply signal at an input supply voltage is described. The circuit includes rectifier circuitry for largely performing full-wave rectification on the input supply signal to produce a full-wave rectified supply signal at a full-wave rectified voltage and a full-wave rectified current susceptible of having at least one overtone of the fundamental supply frequency. The circuit also includes a regulator for regulating the full-wave rectified voltage to produce a regulated power supply voltage with reduced voltage ripple, the regulator operating in buck-boost mode, and control circuitry for measuring at least one such overtone in the full-wave rectified current. The control circuitry also provides the regulator with a primary control signal that causes at least one such overtone to be largely removed from the full-wave rectified current.
    Type: Grant
    Filed: August 23, 2011
    Date of Patent: December 31, 2013
    Inventor: Robert S. Wrathall
  • Patent number: 8605463
    Abstract: Provided is a resonant switching power supply device that can reduce a common mode noise as well as an increase in frequency when a load is light. A resonant switching power supply device 1 equipped with a PFM control circuit 10 to control a switching frequency in such a way that an output voltage is brought to a desired value includes: a resonant circuit where a primary winding N1 of a transformer T2, a current resonant capacitor Cri and a reactor Lr are connected in series; rectifying circuits D1, D2 and Co that are connected to secondary windings N2 and N3 of the transformer T2 and obtain the output voltage Vo; and an electrostatic shield plate S1 disposed between the primary winding N1 and secondary windings N2 and N3 of the transformer T2.
    Type: Grant
    Filed: August 24, 2010
    Date of Patent: December 10, 2013
    Assignee: Sanken Electric Co., Ltd.
    Inventor: Ryouta Nakanishi
  • Publication number: 20130322137
    Abstract: Disclosed is a power factor correction circuit. The power factor correction circuit according to an exemplary embodiment of the present disclosure includes an electrolyte capacitor and a film capacitor, where ripple burden of the electrolyte capacitor is lessened to reduce the capacity of the condenser and to lengthen the life.
    Type: Application
    Filed: May 21, 2013
    Publication date: December 5, 2013
    Applicant: LSIS Co., Ltd.
    Inventors: Jae Ho LEE, Chan Gi PARK, Ho Sang JIN
  • Publication number: 20130314955
    Abstract: A conversion system includes a transformer, a rectifier element, a filter circuit, a voltage regulator circuit, and a divider circuit. The voltage regulator circuit includes a first option switch, a first regulator, and a second regulator. The transformer outputs an AC voltage, and the rectifier element converts the AC voltage to a pulsating DC voltage. The filter circuit converts the pulsating DC voltage to a ripple DC voltage. The divider circuit outputs a first DC voltage of a constant positive value when the first option switch connects to the first regulator, and the divider circuit connects to the first regulator to control value of the first DC voltage value. The divider circuit outputs a second DC voltage of a constant negative value when the first option switch connects the second regulator, and the divider circuit is connected to the second regulator to control value of the second DC voltage.
    Type: Application
    Filed: March 5, 2013
    Publication date: November 28, 2013
    Applicants: HON HAI PRECISION INDUSTRY CO., LTD., HONG FU JIN PRECISION INDUSTRY (WUHAN) CO., LTD.
    Inventors: Hong Fu Jin Precision Industry (WuHan) Co., Ltd., Hon Hai Precision Industry Co., Ltd.
  • Publication number: 20130308354
    Abstract: To provide a power supply noise reduction circuit and a power supply noise reduction method that do not require circuit elements to be increased in size and do not cause voltage drop in a power supply voltage. A power supply noise reduction circuit 10 that reduces noise included in a constant voltage output that is output from a power supply 2 to a load includes a first resistor 20 that is inserted into a power supply line L1 extending from the power supply 2 to the load, a filter 31 that is coupled to a load terminal of the first resistor 20 and outputs a first voltage that is obtained by reducing the noise from the constant voltage output, and a unity gain amplifier 32 that drives the first voltage output from the filter 31 and outputs the driven first voltage to the load terminal of the first resistor 20.
    Type: Application
    Filed: November 12, 2010
    Publication date: November 21, 2013
    Applicant: Verigy (Singapore) Pty. Ltd.
    Inventor: Toshiyuki Sato
  • Patent number: 8587971
    Abstract: An electronic current transformer (ECT) based on complete self-excitation power supply is provided. The ECT includes an energy-obtaining coil, a rapid voltage-stabilizing circuit and an Analog/Digital (A/D) converting circuit. The output of the energy-obtaining coil is connected with the input of the voltage-stabilizing circuit. The output of the voltage-stabilizing circuit is connected with the control end of the A/D converting circuit. The ECT uses two branch circuits to obtain energy directly from the magnetic field of a bus bar to be measured respectively, synthesizes two output waveforms to fill the wave trough of each other, and reduces the pulse of direct current. In this way, the trough voltage of the synthesized wave is higher than the required stabilizing value of direct voltage and it directly meets the input requirement of the stabilizing module of the voltage-stabilizing circuit. As a result, the ECT can activate the A/D converting circuit rapidly.
    Type: Grant
    Filed: January 13, 2010
    Date of Patent: November 19, 2013
    Assignee: Xi'an Hwell Optic-Electric Tech Co., Ltd
    Inventors: Zhongzhan Liu, Xun Wu, Yanting Song
  • Patent number: 8570777
    Abstract: A power supply circuit includes a pulse width modulation (PWM) chip, a number of phase circuits, a voltage output end, and a spike suppression circuit. The spike suppression circuit is connected to each of the phase circuits and the voltage output end. The PWM chip controls all of the phase circuits to alternately output power supply voltages according to a predetermined sequence. The spike suppression circuit receives the power supply voltages, and filters out voltage spikes in the power supply voltages, thereby outputting steady voltages to the voltage output end.
    Type: Grant
    Filed: August 10, 2011
    Date of Patent: October 29, 2013
    Assignees: Hong Fu Jin Precision Industry (ShenZhen) Co., Ltd., Hon Hai Precision Industry Co., Ltd.
    Inventors: Qi-Yan Luo, Song-Lin Tong, Peng Chen
  • Patent number: 8531142
    Abstract: A bi-power motor controlling apparatus, which is electrically connected with a motor, includes a driver IC having a first pin and a second pin. The first and second pins are used to receive a first power and a second power, respectively, from outside. The second power is supplied to the driver IC, and the first power is supplied to the motor for controlling the rotational speed of the motor.
    Type: Grant
    Filed: May 3, 2010
    Date of Patent: September 10, 2013
    Assignee: Delta Electronics, Inc.
    Inventors: Ming-Lung Liu, Chun-Chia Lu, Chia-Feng Wu, Chun-Lung Chiu
  • Patent number: 8488346
    Abstract: According to one embodiment, a power conversion apparatus determines a peak value of circuit current in each pulse cycle, from a corrected output voltage value by subtracting a predetermined reference voltage from an output voltage detected by the output voltage detector, and an input voltage detected by the input voltage detector. The pulse signal output unit outputs a pulse signal to the first switch when the polarity of input voltage is positive, and outputs a pulse signal to the second switch when the polarity of input voltage is negative. A pulse signal turns on in synchronization with a clock signal input from the oscillator, and is kept on until the circuit current detected by the circuit current detector reaches the peak value. A pulse signal turns off when the circuit current reaches the peak value, and turns on again in synchronization with the next clock signal.
    Type: Grant
    Filed: August 26, 2011
    Date of Patent: July 16, 2013
    Assignee: Toshiba Tec Kabushiki Kaisha
    Inventor: Yutaka Usami
  • Publication number: 20130163296
    Abstract: A power circuit includes an input terminal receiving alternating current, a first AC filtering circuit connected to the input terminal, a bridge rectifier circuit, a DC filtering circuit, a DPDT switch, and an output terminal. Two input ends of the bridge rectifier circuit are connected to the first AC filtering circuit. The DPDT switch includes a first pair of pins, a second pair of pins, and a pair of output pins. The first pair of pins is connected to the DC filtering circuit. The second pair of pins is connected to the input terminal. The DC filtering circuit is connected to the pair of output pins of the DPDT switch. The first pair of pins is switched on to enable the output terminal to output direct current, and the second pair of pins is switched on to enable the output terminal to output alternating current.
    Type: Application
    Filed: August 9, 2012
    Publication date: June 27, 2013
    Applicants: HON HAI PRECISION INDUSTRY CO., LTD., HONG FU JIN PRECISION INDUSTRY (WUHAN) CO., LTD.
    Inventors: ZHI-YONG GAO, HAI-YI JI, YU-LIN LIU
  • Patent number: 8416590
    Abstract: The present power supply device includes a microcomputer that detects a current input to an active filter, a voltage input to the active filter, and a voltage output from the active filter, decreases a target voltage as the input current increases, and controls an IGBT to turn on/off the IGBT to match the input current and the input voltage in phase with each other and also match the output voltage to the target voltage. Thus, as the input current increases, the target voltage is decreased. A power supply terminal can have a voltage with a low noise level.
    Type: Grant
    Filed: October 13, 2009
    Date of Patent: April 9, 2013
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Michiho Yoshida, Masataka Onishi
  • Patent number: 8400793
    Abstract: A method for providing a switching order signal to a cell of a cascaded two-level converter is provided. The cell includes a capacitor parallel-connected with two series-connected semiconductor devices. The cascaded two-level converter includes two or more of the cells cascade connected and arranged in a phase, divided into two phase arms, between a first pole and a second pole of a direct voltage side. The method includes measuring voltages of the capacitor of the cell; calculating a compensated voltage reference based on a voltage reference and the measured voltages of the capacitors, wherein the voltage reference corresponds to a desired ac current to be output on an ac-side; using the compensated voltage reference to calculate a switching order signal, and providing the switching order signal to the cells.
    Type: Grant
    Filed: February 11, 2009
    Date of Patent: March 19, 2013
    Assignee: ABB Research Ltd.
    Inventors: Tomas Jonsson, Lennart Harnefors
  • Patent number: 8289738
    Abstract: A switching power supply has a full-wave AC rectifier circuit; a chopper circuit including an inductor, a capacitor smoothing current from the inductor, and a switching device for on-off control of the current fed to the capacitor. The rectifier circuit further has an input voltage detector circuit detecting chopper circuit input voltage; an output voltage error detector circuit detecting an error between an output voltage from the chopper circuit and a set voltage; a current control signal generator circuit generating a current control signal in-phase with an input voltage detection signal having a waveform similar to the input voltage detection signal and an amplitude proportional to an output voltage error signal; a current detector circuit detecting inductor current flow; a frequency setting circuit; an oscillator circuit; and a switching control circuit switching the switching device based on oscillation circuit signal, the current control signal, and the current detection signal.
    Type: Grant
    Filed: March 4, 2010
    Date of Patent: October 16, 2012
    Assignee: Fuji Electric Co., Ltd.
    Inventor: Hideo Shimizu
  • Patent number: 8289730
    Abstract: Systems, methods and devices for power generation systems are described. In particular, embodiments of the invention relate to the architecture of power conditioning systems for use with fuel cells and methods used therein. More particularly, embodiments of the present invention relate to methods and systems usable to reduce ripple currents in fuel cells.
    Type: Grant
    Filed: June 7, 2011
    Date of Patent: October 16, 2012
    Assignee: Bloom Energy Corporation
    Inventors: Ranganathan Gurunathan, Ramesh Srinivasan, Pavana Kumar
  • Patent number: 8279642
    Abstract: An inverter for converting an input direct current (DC) waveform from a DC source to an output alternating current (AC) waveform for delivery to an AC grid includes an input converter, an output converter, and an active filter, each of which is electrically coupled to a bus. The bus may be a DC bus or an AC bus. The input converter is configured to convert the input DC waveform to a DC or AC bus waveform. The output converter is configured to convert the bus waveform to the output AC waveform at a grid frequency. The active filter is configured to reduce a double-frequency ripple power of the bus waveform by supplying power to and absorbing power from the power bus.
    Type: Grant
    Filed: September 21, 2009
    Date of Patent: October 2, 2012
    Assignee: SolarBridge Technologies, Inc.
    Inventors: Patrick L. Chapman, Brian T. Kuhn, Robert S. Balog, Jonathan W. Kimball, Philip T. Krein, Alexander Gray
  • Patent number: 8232779
    Abstract: A method for selecting the optimum number of phases for a converter is provided, which selects a duty range using an input voltage and an output voltage, obtains ripple values for multiple phases in the duty range, and selects the optimum number of phases using the corresponding ripple values. The method for selecting the optimum number of phases for a converter includes a duty range selection step of selecting a duty range using an input voltage and an output voltage, a ripple value calculation step of obtaining ripple values for multiple phases within the selected duty range, a range ripple selection step of selecting one or more phases in the duty range, and a rated ripple selection step of selecting the phases having the minimum ripple value in a rated duty among the phases selected in the range ripple selection step.
    Type: Grant
    Filed: February 18, 2009
    Date of Patent: July 31, 2012
    Assignee: Sungkyunkwan University Foundation for Corporate Collaboration
    Inventors: Byoung-Kuk Lee, Jong-Soo Kim, Gyu-Yeong Choe
  • Patent number: 8223512
    Abstract: A power converter includes a small-sized inductor connected to an AC voltage input line for power factor correction and a filter for suppressing conduction noise. The inductor is connected to a rectifier and comprises first and second windings and that are wound on a common magnetic core and loosely coupled with each other. A leakage inductance component of the inductor functions as an energy storage element in a main conversion operation and an excitation inductance component of the inductor functions as a noise reduction element for suppressing an conduction noise caused by on-off operation of a switching element.
    Type: Grant
    Filed: March 10, 2009
    Date of Patent: July 17, 2012
    Assignee: Fuji Electric Co., Ltd.
    Inventors: Michiya Yamada, Yukihiro Nishikawa
  • Patent number: 8180526
    Abstract: Equipment for vehicle in accordance with the present invention includes: a vehicle-mounted unit which runs with respect to a vehicle body ground on a side of a negative electrode of a battery; an impedance component having an end connected to the vehicle body ground, and another end connected to a circuit ground; a circuit to be controlled which runs with respect to the circuit ground; a control unit which runs with respect to the circuit ground, for controlling the circuit to be controlled and for outputting a communication signal in a digital form which is to be transmitted to the vehicle-mounted unit; and a communication interface circuit which runs with respect to both the vehicle body ground and the circuit ground, for cancelling a potential difference between the vehicle body ground and the circuit ground, and for carrying out bidirectional communications between the vehicle-mounted unit and the control unit.
    Type: Grant
    Filed: November 17, 2006
    Date of Patent: May 15, 2012
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yasunori Ohtsuka, Takashi Ohsawa
  • Patent number: 8169172
    Abstract: A variable speed drive for an electric motor has an inverter for receiving pulse width modulation controls. The inverter communicates power signals to a poly-phase electrical motor. A resolver communicates signals from the poly-phase motor back to a motor control. The motor control includes a speed control, a field-oriented control, and a pulse width modulation drive for driving the inverter. The resolver is connected to the speed control and to the field-oriented control, and further communicates with a synchronous compensator. The synchronous compensator is configured to drive the harmonic content at a target frequency or frequencies in a selected signal towards zero over time.
    Type: Grant
    Filed: May 3, 2010
    Date of Patent: May 1, 2012
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Albert L. Markunas, James J. Wrobel
  • Publication number: 20120099349
    Abstract: An active rectification system includes a three-level active rectifier and a pulse with modulation (PWM) control portion. The three-level active rectifier includes at least three switches, the at least three switches are selectively switchable between an upper state, a center state, and a lower state. The PWM control portion is in communication with the at least three switches, the PWM control portion is configured and disposed to create an upper carrier signal and a lower carrier signal, and the PWM control portion is configured and disposed to selectively switch the at least three switches between the upper state, the center state, and the lower state in response to a phase disposition of the upper carrier signal and the lower carrier signal.
    Type: Application
    Filed: October 22, 2010
    Publication date: April 26, 2012
    Applicant: HAMILTON SUNDSTRAND CORPORATION
    Inventor: John Duward Sagona
  • Patent number: 8159841
    Abstract: A method, device, and plurality of circuit enhancements for a rectifier system that enable reduction in lower order and higher order harmonics, without substantially reducing the rectifier's direct current output voltage. The rectifier system comprises a phase shifting primary transformer subsystem and a multi-pulse rectifier. At least one series impedance path is coupled to one of three input terminals/leads of the transformer subsystem and conducts one phase of three phase currents from a power supply to the transformer subsystem. The series impedance path provides low impedance to the 1st harmonic and substantially higher, inductive impedance to higher harmonics of the power supply frequency.
    Type: Grant
    Filed: April 6, 2009
    Date of Patent: April 17, 2012
    Assignee: Howard Industries, Inc.
    Inventor: Donald W. Owen