With Ripple Responsive, Automatic Control Patents (Class 363/46)
  • Patent number: 10778089
    Abstract: An active electromagnetic interference (EMI) filter includes a first amplifier and a second amplifier. The first amplifier is configured to sense noise signals on a power conductor. The second amplifier is coupled to the first amplifier and is configured to drive a cancellation signal onto the power conductor. The cancellation signal is to reduce the amplitude of the noise signals sensed by the first amplifier. An output impedance of the second amplifier is lower than an output impedance of the first amplifier.
    Type: Grant
    Filed: September 26, 2017
    Date of Patent: September 15, 2020
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Yongbin Chu, Yogesh Ramadass, Saurav Bandyopadhyay, Todd Allen Toporski, Jeffrey Anthony Morroni
  • Patent number: 10715044
    Abstract: A control circuit of a power converter providing at least a first output voltage and a second output voltage, having: a first loop control circuit, configured to provide a first error amplifying signal based on the first output voltage and a first reference voltage; a second loop control circuit, configured to provide a second error amplifying signal based on the second output voltage and a second reference voltage; a saturation detecting circuit, configured to provide a saturation indicating signal based on the first error amplifying signal and a saturation reference signal; and a first current source circuit, configured to charge an output terminal of the second error amplifier based on the saturation indicating signal.
    Type: Grant
    Filed: November 26, 2019
    Date of Patent: July 14, 2020
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Bairen Liu, Shufa Jiang, Bo Yu
  • Patent number: 10243465
    Abstract: Some apparatus and associated methods relate to a buck-derived switched mode power supply with constant on-time and configured to substantially maintain a steady-state average switch period in a time interval between a start of a load transient and the time when the inductor current returns to a steady state. In an illustrative example, the time interval may include a first and a second predetermined number of cycles after the start of the load transient. The switch period may be modulated, for example, by an amount calculated to supply a change in additional energy demand in the first number of cycles and an opposite amount in the subsequent second number of cycles calculated to maintain the average steady-state switch period over the time interval. In various examples, maintaining average switching period with constant on-time may minimize transient response times without sacrificing stability and without the need for complex compensation networks.
    Type: Grant
    Filed: July 17, 2018
    Date of Patent: March 26, 2019
    Assignee: Alpha and Omega Semiconductor (Cayman) Limited
    Inventor: Chris M. Young
  • Patent number: 10224805
    Abstract: Methods and apparatus relate to a minimizing ripple in a polyphase power supply by modulating a voltage pre-regulator output setpoint to minimize ripple performance. In an illustrative example, the modulation may include incrementally adjusting the pre-regulator output setpoint supplied, for example, to a multiphase controller. Some examples may reverse the increment direction in response to determining that the prior incremental adjustment yielded increased ripple. Each phase of the polyphase power supply may include a buck-derived switch-mode power supply connected, for example, to a common output node. Various embodiments may advantageously maximize reduce bulk capacitance requirements for active loads by dynamically seeking a duty cycle of the polyphase power supply with substantially minimal ripple.
    Type: Grant
    Filed: July 23, 2018
    Date of Patent: March 5, 2019
    Assignee: Alpha and Omega Semiconductor (Cayman) Limited
    Inventor: Chris M. Young
  • Patent number: 9800135
    Abstract: A ripple suppressor suppresses ripples of a channel current. The ripple suppressor comprises a voltage-controlled current source, a stabilizer, and an auto-calibration circuit. A control voltage at a control node controls the channel current flowing through a path connecting first and second channel nodes. The voltage-controlled current source receives a current-setting signal to generate the control voltage, so as to stabilize the channel current in response to the current-setting signal. The stabilizer at least provides low-pass filtering to generate and stabilize the current-setting signal in response to a first channel voltage at the first channel node. The auto-calibration circuit controls the stabilizer in response to the control voltage, so as to make the control voltage in compliance with a first predetermined condition.
    Type: Grant
    Filed: September 2, 2016
    Date of Patent: October 24, 2017
    Assignee: LEADTREND TECHNOLOGY CORPORATION
    Inventors: Ching-Tsan Lee, Wei-Wen Ou, Chien-Chun Lu
  • Patent number: 9787194
    Abstract: A primary side regulated isolation voltage converter. The primary side regulated isolation voltage converter comprises a control module and a ripple control circuit. The control module receives the voltage feedback signal and determines whether the isolation voltage converter operates in a light load state. When the isolation voltage converter operates in a light load state, the ripple control circuit senses the ripple of an output voltage signal to generate a ripple signal, and compare the ripple signal with a ripple threshold. When the ripple signal is larger than the ripple threshold, the isolation voltage converter jumps out the light load state.
    Type: Grant
    Filed: March 4, 2016
    Date of Patent: October 10, 2017
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Yike Li
  • Patent number: 9621022
    Abstract: Aspects of the disclosure provide a circuit. The circuit includes a voltage step up circuit, a voltage control unit, and a complementary voltage generator. The voltage step up circuit is configured to receive a primary supply voltage of a first voltage level and output a secondary supply voltage of a second voltage level that is higher than the first voltage level. The voltage control unit is configured to receive the secondary supply voltage and to output a control voltage having a voltage level in a range from a ground level to the second voltage level. The complementary voltage generator is configured to operate based on the primary supply voltage and to generate a pair of complementary signals in response to the control voltage. The voltage sum of the pair of complementary signals is equivalent to the first voltage level.
    Type: Grant
    Filed: May 22, 2014
    Date of Patent: April 11, 2017
    Assignee: Marvell Israel (M.I.S.L) Ltd.
    Inventor: Shimon Avitan
  • Patent number: 9537410
    Abstract: A system and method for series connecting electronic power devices are disclosed. In one embodiment, a switching device system includes a first upper arm electrically coupled to a first lower arm and a second upper arm electrically coupled to a second lower arm. Each of the arms include a plurality of low voltage sub-modules connected in series and each plurality of low voltage sub-modules includes an auxiliary switching device, a series switching device, and a capacitor. Each plurality of low voltage sub-modules is configured to be sequentially switched using the auxiliary switching device and the series switching device separately in the upper arms and the respective lower arms to control change in voltage over time (dV/dt) while selectively blocking a desired high voltage. Further, a capacitor voltage balancing (sorting or rotating) algorithm may be used to actively balance voltage across each plurality of low voltage sub-modules.
    Type: Grant
    Filed: September 10, 2014
    Date of Patent: January 3, 2017
    Assignee: General Electric Company
    Inventors: Rui Zhou, Luis Jose Garces, Ravisekhar Nadimpalli Raju, Rixin Lai, Di Zhang
  • Patent number: 9502962
    Abstract: Embodiments of the present application provide a power factor correction circuit and a power supply circuit. The power factor correction circuit includes a main correction circuit and a switch module. The main correction circuit includes: a first correction circuit and a second correction circuit that are configured to perform power factor correction on a forward alternating current voltage, and a third correction circuit and a fourth correction circuit that are configured to perform power factor correction on an inverse alternating current voltage. The switch module includes first switch units that are connected in parallel between an input terminal of the first correction circuit and an input terminal of the third correction circuit, and second switch units that are connected in parallel between an input terminal of the second correction circuit and an input terminal of the fourth correction circuit.
    Type: Grant
    Filed: December 20, 2013
    Date of Patent: November 22, 2016
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Yang Cheng, Weifeng Wang, Xiaofeng Yao
  • Patent number: 9484833
    Abstract: The present invention discloses a system and a method for controlling PCS voltage and frequency, wherein the system comprises a reference voltage converter, a phase-locked loop, a grid-side voltage converter, a voltage transformer, a first proportional integral controller, a second proportional integral controller, a coordinate converter and a SVPWM generator; a reference voltage converter is connected to an output terminal of a the phase-locked loop, and the output terminal of the phase-locked loop is further connected to a grid-side voltage converter; the grid-side voltage converter is connected to a high-voltage side of an isolating transformer of the electric grid via the voltage transformer; two output terminals of the grid-side voltage converter are respectively connected to the coordinate converter via two proportional integral controllers; an output terminal of the coordinate converter is connected to the SVPWM generator; an output terminal of the SVPWM generator is connected to a power switch of the
    Type: Grant
    Filed: December 24, 2013
    Date of Patent: November 1, 2016
    Assignees: State Grid Corporation of China, Xuancheng Power Supply Company of State Grid Anhui Electric Power Corporation, Beijing Hua Teng Kai Yuan Electric Company Limited
    Inventors: Yeru Zhou, Jian Wang, Dongsheng Fu, Xiaoma Jin, Dongsheng Zou, Jin Pan, Yi Song, Jianzhou Cheng, Tianwen Zheng, Jianming Wu, Hongbo Luo
  • Patent number: 9473026
    Abstract: The step-up converter includes the plurality of converting units, each having the reactor and the semiconductor element part having electronic parts such as the transistor and the diodes. The ECU performs changeover control of increase or decrease of the number of drive phases of the converting units, based on the output condition from the fuel cell, the temperature condition of the reactor, and the temperature condition of the semiconductor element part.
    Type: Grant
    Filed: July 19, 2011
    Date of Patent: October 18, 2016
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventor: Kota Manabe
  • Patent number: 9419510
    Abstract: Provided are circuits and methods for use with a power supply that provides a main output including a main DC voltage having a first AC voltage ripple, or a main DC current having a first AC current ripple. A ripple cancellation converter provides a second AC voltage ripple connected in series with the main output, such that the first AC voltage ripple is substantially cancelled; or a second AC current ripple connected in parallel with the main output, such that the first AC current ripple is substantially cancelled. As a result, substantially ripple-free DC output power is provided.
    Type: Grant
    Filed: October 17, 2012
    Date of Patent: August 16, 2016
    Assignee: Queen's University at Kingston
    Inventor: Yan-Fei Liu
  • Patent number: 9274534
    Abstract: A voltage regulator includes a pass element having a control input coupled to a control node and operable to generate an output voltage at an output node, a negative feedback amplifier operable to receive a reference voltage and the output voltage and generate a signal at the control node based on a difference between the reference voltage and the output voltage, and a noise cancellation circuit coupled to the control node and the output node and operable to generate a bias current at the control node based on the output voltage.
    Type: Grant
    Filed: December 21, 2012
    Date of Patent: March 1, 2016
    Assignee: Advanced Micro Devices, Inc.
    Inventors: Emerson S. Fang, Alvin Leng Sun Loke
  • Patent number: 9264007
    Abstract: A noise filter can reliably reject an in-phase component included in a differential signal without generating anti-resonance at a target frequency reject and, a transmission device including such a noise filter. Ends of a pair of coils are connected to a pair of transmission lines in the vicinity of the transmitting circuit, and other ends are short-circuited. The coils are magnetically coupled so that the magnetic flux is cancelled regarding the in-phase component that transmits the pair of transmission lines, and the magnetic flux is increased regarding an opposite-phase component that transmits the pair of transmission lines. A series circuit, which includes an inductor and a capacitor connected in series, is connected to the pair of coils and ground. Each value of the pair of coils, the inductor, and the capacitor is set so that a resonance frequency of the in-phase component is a target frequency.
    Type: Grant
    Filed: September 16, 2011
    Date of Patent: February 16, 2016
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Hiroto Tamaki
  • Patent number: 9170587
    Abstract: This invention provides a current control semiconductor element that can detect a current with high accuracy in a single IC chip by dynamically correcting changes in a gain a and an offset b, and a control device that uses the current control semiconductor element, the current control semiconductor element has a transistor 4, a current-to-voltage conversion circuit 22 and an AD converter 23 on the same semiconductor chip. A reference current generation circuit 6 superimposes a current pulse Ic on a current of a load 2 and changes a voltage digital value to be output from the AD converter. A gain/offset corrector 8 executes signal processing on change in the voltage digital value caused by the reference current generation circuit 6 to dynamically acquire the gain a and the offset b that are used in an equation that indicates a linear relationship between the voltage digital value output from the AD converter 23 and the current digital value of the load.
    Type: Grant
    Filed: August 1, 2011
    Date of Patent: October 27, 2015
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Teppei Hirotsu, Nobuyasu Kanekawa, Itaru Tanabe
  • Patent number: 9041339
    Abstract: A system and method for digital management and control of power conversion from battery cells. The system utilizes a power management and conversion module that uses a CPU to maintain a high power conversion efficiency over a wide range of loads and to manage charge and discharge operation of the battery cells. The power management and conversion module includes the CPU, a current sense unit, a charge/discharge unit, a DC-to-DC conversion unit, a battery protection unit, a fuel gauge and an internal DC regulation unit. Through intelligent power conversion and charge/discharge operations, a given battery type is given the ability to emulate other battery types by conversion of the output voltage of the battery and adaptation of the charging scheme to suit the battery.
    Type: Grant
    Filed: October 26, 2012
    Date of Patent: May 26, 2015
    Assignee: Solaredge Technologies Ltd.
    Inventors: Meir Adest, Lior Handelsman, Yoav Galin, Amir Fishelov, Guy Sella
  • Publication number: 20150115812
    Abstract: A spike-free converter for driving light-emitting diodes includes a closed loop direct current-direct current (dc-dc) converting unit, a switch, a first inductor, and a first diode. The closed loop dc-dc converting unit is used for generating a driving voltage to drive at least one light-emitting diode strings according to a dc voltage, and generating a switch control signal. The switch is used for receiving the switch control signal and being turned on and turned off according to the switch control signal.
    Type: Application
    Filed: October 28, 2013
    Publication date: April 30, 2015
    Inventor: Sheng-Hann Lee
  • Patent number: 8995153
    Abstract: The disclosure relates to a passive power factor correction circuit. The passive power factor correction circuit comprises: a filtering device being used for decreasing high order harmonic of an input current; a resonance device being coupled to the filtering device for controlling operation time of the input current; and a suppression device being coupled to the resonance device for suppressing ripple of the input current.
    Type: Grant
    Filed: February 8, 2013
    Date of Patent: March 31, 2015
    Assignee: Industrial Technology Research Institute
    Inventors: Po-Yen Chen, Ching-Tsai Pan
  • Publication number: 20140252973
    Abstract: Provided are circuits and methods for use with a power supply that provides a main output including a main DC voltage having a first AC voltage ripple, or a main DC current having a first AC current ripple. A ripple cancellation converter provides a second AC voltage ripple connected in series with the main output, such that the first AC voltage ripple is substantially cancelled; or a second AC current ripple connected in parallel with the main output, such that the first AC current ripple is substantially cancelled. As a result, substantially ripple-free DC output power is provided.
    Type: Application
    Filed: October 17, 2012
    Publication date: September 11, 2014
    Applicant: Queen's University at Kingston
    Inventor: Yan-Fei Liu
  • Publication number: 20140085945
    Abstract: A power supply system has a current source configured to provide an output current, a load supplied by the current source, and a current ripple suppression circuit. The current ripple suppression circuit has a first end and a second end, wherein the first end of the current ripple suppression circuit is coupled to the load, and the second end of the current ripple suppression circuit is coupled to a reference ground; wherein the current ripple suppression circuit is configured to suppress the current ripple in the output current and adaptively adjust the output current of the current source at a predetermined current level.
    Type: Application
    Filed: September 26, 2013
    Publication date: March 27, 2014
    Applicant: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Naixing Kuang, Jiaqi Yu, Bo Yu
  • 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
  • Patent number: 8593837
    Abstract: Provided is a power supply device for an image forming apparatus, the power supply device including: a filter unit filtering alternating current (AC) power from an AC power source; and a converter generating a direct current (DC) power from the filtered AC power, wherein the filter unit includes: a capacitor connected to the AC power source; a discharge device connected to the capacitor and discharging electric charges accumulated in the capacitor; and a switching device switching connection between the capacitor and the discharge device according to a power supply mode of the power supply device.
    Type: Grant
    Filed: March 5, 2010
    Date of Patent: November 26, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Hyung-Won Hong
  • 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
  • Publication number: 20130286693
    Abstract: A method for reducing a ripple, caused by rotational nonuniformity of an internal combustion engine, in the output voltage of a generator which is driven by the internal combustion engine is provided. The generator has a stator winding, a rotor winding, a field controller, associated with the rotor winding, for regulating the output voltage of the generator, and a downstream power converter having controllable switching elements. To reduce the voltage ripple, the output voltage of the generator is regulated on the stator side by appropriately controlling the switching elements of the power converter.
    Type: Application
    Filed: September 9, 2011
    Publication date: October 31, 2013
    Inventors: Ralf Herbig, Julian Roesner
  • 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
  • Publication number: 20130279214
    Abstract: A power regenerative converter includes: a power conversion unit configured to convert AC power supplied from an AC power supply into DC power and convert DC power into AC power to be supplied as regenerative electric power to the AC power supply supply; an LCL filter including a reactor unit having a plurality of reactors connected in series between the power conversion unit and the AC power supply, and capacitors each having one end connected to a series connection point of the reactors in the reactor unit; a drive control unit for controlling the power conversion unit based on an AC voltage command; and a voltage command compensation unit for calculating a compensation value in accordance with a capacitor voltage being a voltage at the series connection point of the reactors and adding the compensation value to the AC voltage command input to the drive control unit.
    Type: Application
    Filed: April 10, 2013
    Publication date: October 24, 2013
    Applicant: Kabushiki Kaisha Yaskawa Denki
    Inventors: Yoshiyasu TAKASE, Kozo IDE, Shinya MORIMOTO, Hideaki IURA, Takahiro SAEKI
  • Patent number: 8564982
    Abstract: A power supply circuit to detect whether or not abnormal current is generated in a power factor compensation circuit and forcibly stop an operation of an interleaved power factor compensation circuit controller if abnormal current is generated. The power supply circuit includes a rectifier, a power factor compensation circuit including a plurality of reactors, a plurality of switches and a plurality of current detectors, a power factor compensation circuit controller to control switching of the switches and to control a power factor compensation operation, and a power factor compensation circuit protection circuit to receive the voltages output from the plurality of current detectors and to stop the operation of the power factor compensation circuit controller if at least one of the voltages output from the plurality of current detectors is abnormal. Thus, it is possible to prevent failure of the switches and the current detectors due to abnormal current.
    Type: Grant
    Filed: August 29, 2011
    Date of Patent: October 22, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Ho Gul Song, Kyoung Hoe Kim, Jong Hun Ha, Dae Hee Han, Yong Wook Kim
  • Publication number: 20130250632
    Abstract: A circuit arrangement includes a transformer, having primary windings and secondary windings, and a high voltage capacitor. A first switching circuit couples the high voltage capacitor to the primary windings. A first controller is operatively coupled to the switching circuit. A second switching circuit couples the secondary windings to an output port. A second controller is operatively coupled to the secondary windings. A high voltage generator is provided to charge the high voltage capacitor.
    Type: Application
    Filed: May 22, 2013
    Publication date: September 26, 2013
    Applicant: International Business Machines Corporation
    Inventors: Raymond M. Clemo, Jamaica L. Barnette, Alfred L. Burress, Randhir S. Malik
  • Patent number: 8542503
    Abstract: Systems and methods described herein provide for high speed power factor correction which can overcome or substantially alleviate the problems associated with changes in the operating conditions of a load or other transient events. The present technology senses the present state conditions of a signal to quickly and accurately determine the presence of an overtone component within the signal. The expected value of the overtone component is then determined based on the sensed state of the signal. Power factor correction is then performed to suppress the overtone utilizing a control signal formed based on the expected value of the overtone. By performing power factor correction based on the expected value, the present technology can provide high speed power factor correction which is not limited by the delay introduced by an adaptive feedback loop.
    Type: Grant
    Filed: January 31, 2011
    Date of Patent: September 24, 2013
    Inventor: Robert Stephen Wrathall
  • 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: 8422255
    Abstract: An oscillation control part composed of a control switching element and a damping resistance connected in parallel is arranged between an input power supply and a main switching element of a power conversion circuit, and the control switching element and the main switching element have a relationship such as Ron(S2)<E(Rg)×fsw/(D×I2), and the main switching element is turned off and after a current of the main switching element has become zero, the control switching element is turned off to prevent a high-frequency oscillation generated between a parasitic inductance of the circuit and a junction capacitance of the main switching element, with a damping resistance.
    Type: Grant
    Filed: September 7, 2010
    Date of Patent: April 16, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Kazuto Takao
  • 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: 8259472
    Abstract: A switch controller is disclosed that adaptively controls the operating frequency of a switching power converter in order to improve one-time load response and repetitive dynamic load responses. During a transition from a high load to low load condition, the switch controller clamps the operating frequency of the switching power converter at an intermediate frequency for a period of time before allowing the operating frequency to return to a frequency associated with the low load condition. The clamped frequency is higher than the frequency associated with the low load condition thereby allowing improved response to a subsequent load change to a high load condition. Thus, the system improves dynamic load response without compromising no-load power consumption.
    Type: Grant
    Filed: April 13, 2011
    Date of Patent: September 4, 2012
    Assignee: iWatt Inc.
    Inventors: Yong Li, Fuqiang Shi, Xiaolin Gao, David Nguyen
  • 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: 8228698
    Abstract: The shape of the rising and falling edges of AC output voltage pulses of a PWM frequency converter is controlled by reducing a speed of change, and a height, of the AC output voltage pulse. The PWM frequency converter rectifies the alternating voltage of a supply network into a DC voltage which is filtered. A load bridge having power semiconductor phase switches forms an AC output voltage from the DC voltage for controlling the load. An average speed of voltage change of AC output voltage pulses is set using a phase switch to control at least one power component to be conductive and non-conductive in turn for a period of at least about one microsecond to change a pulse edge of the AC output voltage pulses into at least one micropulse, the width of which is controlled to increase towards a final state of the phase switch.
    Type: Grant
    Filed: May 27, 2008
    Date of Patent: July 24, 2012
    Assignee: Vacon Oyj
    Inventors: Hannu Sarén, Kimmo Rauma, Juha-Pekka Ström, Magnus Hortans
  • 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
  • Patent number: 8120306
    Abstract: Methods and apparatus are provided for operation of a voltage source inverter. A method of operating a voltage source inverter having an output with multiple voltage phases having a DC voltage level, the method comprising sensing a low output frequency condition; determining a DC voltage offset responsive to the low output frequency condition; and applying the DC voltage offset when operating the voltage source inverter resulting in a change to the DC voltage level of the multiple voltage phases.
    Type: Grant
    Filed: January 5, 2009
    Date of Patent: February 21, 2012
    Assignee: GM Global Technology Operations LLC
    Inventors: Sibaprasad Chakrabarti, Rajkumar Copparapu
  • Patent number: 8044630
    Abstract: Radiofrequency device (30; 30?; 30?; 30??) controlling means for supplying at least one electrical load (14, 14?) and comprising a radiofrequency unit (11) of radiofrequency signals transmitter and/or receiver type and connected by a first conductor (9b) to the AC mains (9), wherein the radiofrequency unit comprises a radiofrequency signal output and/or input (20) connected by an HF link (19) to a first terminal (21) of a tuning circuit (17; 17?) of the radiofrequency device, this tuning circuit being: connected by a second terminal (22) to the first conductor, connected by a third terminal (23) to an electrical ground (GND) of the radiofrequency unit, furnished with means (L1, C1; L2, C3, C4) for blocking the conduction of radiofrequency signals on the first conductor between the second terminal and the third terminal, and traversed between the second terminal and the third terminal by the AC current (I-ACT) flowing in the first conductor and supplying said electrical load.
    Type: Grant
    Filed: April 9, 2009
    Date of Patent: October 25, 2011
    Assignee: Somfy SAS
    Inventor: Michel Ramus
  • Publication number: 20110255314
    Abstract: A power supply module having a PFC stage has a hold-up capacitor (34) for continuing output power for a time after an ac power supply (2) stops. The hold-up capacitor is charged by a winding (40) driven magnetically from a first winding (24); the first winding (24) may be the winding used in a boost converter stage, such as commonly used in a PFC stage, or alternatively the winding in an alternative stage such as a flyback converter.
    Type: Application
    Filed: December 21, 2009
    Publication date: October 20, 2011
    Applicant: NXP B.V.
    Inventors: Johann Baptist Daniel Kuebrich, Thomas Antonius Duerbaum, Marcus Schmid, Hans Halberstadt
  • Publication number: 20110235373
    Abstract: An active switching ripple filter system removes ripple currents from a power signal and has a main inverter and an active switching ripple filter inverter whose outputs are combined to form an output power signal.
    Type: Application
    Filed: March 24, 2010
    Publication date: September 29, 2011
    Inventors: Miaosen Shen, Vladimir Blasko
  • Patent number: 8022575
    Abstract: Exemplary embodiments of the present disclosure provide a method and controller for damping multimode electromagnetic oscillations in electric power systems which interconnect a plurality of generators and consumers. The controller for damping such oscillations includes a phasor measurement unit (PMU) and a power oscillation damper (POD) controller. Each oscillating mode signal is damped and then superposed to derive a control signal. A feedback controller is used to feedback the control signal to a power flow control device in the power system.
    Type: Grant
    Filed: September 16, 2009
    Date of Patent: September 20, 2011
    Assignee: ABB Research Ltd
    Inventors: Petr Korba, Mats Larsson
  • Patent number: 8018696
    Abstract: A system for moving an aircraft thrust reverser component includes a power drive unit, a thrust reverser actuator assembly, and a tertiary lock system. The power drive unit is operable to rotate and supply a rotational drive force. The thrust reverser actuator assembly receives the rotational drive force from the power drive unit and moves the thrust reverser component between a stowed position and a deployed position. The tertiary lock system selectively engages and disengages the thrust reverser component and includes a tertiary lock power unit, an electromechanical tertiary lock assembly, and a voltage limiting circuit. The voltage limiting circuit limits the voltage magnitude of a control signal supplied to the tertiary lock assembly to a predetermined value.
    Type: Grant
    Filed: May 5, 2008
    Date of Patent: September 13, 2011
    Assignee: Honeywell International Inc.
    Inventor: Terry L. Ahrendt
  • Patent number: 7974106
    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: May 7, 2007
    Date of Patent: July 5, 2011
    Assignee: Bloom Energy Corporation
    Inventors: Ranganathan Gurunathan, Ramesh Srinivasan, Pavana Kumar
  • Patent number: 7969756
    Abstract: A vehicle or other complex system includes at least one switching power converter which generates direct output voltage with inherent ripple. A voltage estimator or simulator estimates the instantaneous output ripple voltage(s) of the converter in the time domain. The estimator is preprogrammed with state equations of the power converter, for generating the estimates of the output ripple voltage of the converter. A comparator compares at least the ripple voltage of the simulator with the actual voltage of the converter, to generate a difference signal. The difference signal is evaluated to identify a fault condition. The fault condition is reported andor switches to a backup converter.
    Type: Grant
    Filed: October 17, 2007
    Date of Patent: June 28, 2011
    Assignee: Lockheed Martin Corporation
    Inventor: Keng C. Wu
  • Patent number: 7965525
    Abstract: In a pulse-width-modulation (PWM) direct current (DC) steady-state output circuit, there are included an electrode switch and a resistor-capacitor (RC) integrating filter. The electronic switch has a signal input end, via which a PWM signal is input, and a high-level end. The RC integrating filter includes at least one RC filtering unit and a first protection unit. There can be (1+n) order(s) of the RC filtering unit(s) with a first-order RC filtering unit connected to the electronic switch and the first protection unit and the RC filtering unit(s) at the rest order(s), if any, being sequentially connected to the first-order RC filtering unit one by one. When the electronic switch has signals input thereto, the RC integrating filter makes feedback compensation to enable output of a steady-state DC level.
    Type: Grant
    Filed: November 24, 2008
    Date of Patent: June 21, 2011
    Assignee: Asia Vital Components Co., Ltd.
    Inventor: Po-Sheng Huang
  • Patent number: 7898827
    Abstract: An active electromagnetic interference (EMI) filtering may reduce the requirements for high current differential mode inductors. The active EMI filtering of the present invention may be useful in power devices that use switching power converters. Conventional EMI differential mode filtering devices may occupy up to 30% of the total weight and volume of the power electronics. Conventional differential mode filtering inductors tend to be large and heavy, especially so for high current input power lines. The present invention may replace the large conventional differential mode filtering inductors with a smaller set of coupled inductors.
    Type: Grant
    Filed: May 22, 2008
    Date of Patent: March 1, 2011
    Assignee: Honeywell International Inc.
    Inventors: Evgeni Ganev, William Warr
  • Patent number: 7884582
    Abstract: A method in connection with a frequency converter for correcting the power factor of the frequency converter, and a power factor correction unit. The method includes connecting the power factor correction unit between a rectifier bridge of the frequency converter and the supplying AC voltage network, generating with the power factor correction unit DC voltage from the AC voltage of the supply network and feeding the generated DC voltage to the frequency converter via the rectifier bridge of the frequency converter.
    Type: Grant
    Filed: November 25, 2009
    Date of Patent: February 8, 2011
    Assignee: ABB OY
    Inventor: Tero Viitanen
  • Patent number: 7880577
    Abstract: A ripple reduction circuit for use in a current doubler rectifier has first and second inductors coupled via a first coupling coefficient. The first and second inductors generate a first and a second ripple current, respectively. A third inductor is coupled to the first and second inductors; and an impedance is connected in series with the third inductor, wherein the circuit generates a third ripple current opposing the combination of the first and second ripple currents generated by the first and second inductors.
    Type: Grant
    Filed: August 25, 2006
    Date of Patent: February 1, 2011
    Assignee: Lockheed Martin Corporation
    Inventors: John Stanley Glaser, Michael Andrew de Rooij
  • Publication number: 20100296320
    Abstract: A device is disclosed for generating a stable high voltage, namely a high-voltage DC generator for a particle beam apparatus. A method is also disclosed for generating a stable high voltage for a particle beam apparatus. The high-voltage DC generator has a controllable voltage source, which is connected to an amplifier. The high-voltage DC generator ensures that fluctuations of the smoothed high voltage are detected by a capacitive divider and supplied to the amplifier. The amplifier controls the controllable voltage source in counterphase. The voltage of the controllable voltage source is superimposed on the smoothed high voltage. The sum of the voltage of the controllable voltage source and the smoothed high voltage forms the generated and stable high voltage, which is supplied to a particle beam apparatus.
    Type: Application
    Filed: March 2, 2010
    Publication date: November 25, 2010
    Inventor: Jorg Fober