Frequency Conversion (f1-f2) Without Intermediate Conversion To D.c. Patents (Class 363/157)
  • Patent number: 10355618
    Abstract: An ANPC inverter, a zero-crossing switching method and a zero-crossing switching apparatus of the ANPC inverter are provided. The method includes: controlling switch states of switch devices in a bridge leg to change according to a preset logic when zero-crossing switching occurs in an output voltage instruction of the bridge leg, so as to prevent overvoltage in the switch device in the bridge leg. The preset logic includes switching among a sequence of switch state combinations. Switch state combinations of the switch devices before and after the zero-crossing switching occurs are defined as the first and second switch state combinations of the sequence. The second to the penultimate switch state combinations are all safe switch state combinations selected in advance, in each of which a maximum voltage borne by the switch devices in the bridge leg is clamped to a safe limit value.
    Type: Grant
    Filed: April 11, 2018
    Date of Patent: July 16, 2019
    Assignee: SUNGROW POWER SUPPLY CO., LTD.
    Inventors: Jiacai Zhuang, Yuqing Cui, Deyong Zhao, Xiaohui Luo, Chaoxuan Zhang, Jun Xu, Yilei Gu, Xinyu Wang
  • Patent number: 9444361
    Abstract: A mechanical arrangement of a multilevel power converter circuit includes a power converter having a first portion with a plurality of first control inputs, at least three direct current voltage inputs, and an alternating current voltage output, and a second portion with a plurality of second control inputs, the at least three direct current voltage inputs and the alternating current voltage output. The second portion is split apart from the first portion. The power converter has at least three levels corresponding to the at least three direct current voltage inputs.
    Type: Grant
    Filed: December 19, 2011
    Date of Patent: September 13, 2016
    Assignee: GE Power Conversion Technology, Ltd.
    Inventors: Alfred Permuy, Nicholas D. Benavides
  • Patent number: 9036390
    Abstract: The present invention is applied to a frequency converter used for a receiver. The frequency converter according to the present invention includes an LO signal generator (11) that generates an LO signal and outputs the LO signal; and a mixer (10) that multiplies a received signal that has been band-limited to a usable bandwidth of said receiver by the LO signal so as to convert the frequency of the received signal and outputs the resultant signal. Said LO signal generator is capable of varying a phase resolution.
    Type: Grant
    Filed: April 14, 2011
    Date of Patent: May 19, 2015
    Assignee: NEC CORPORATION
    Inventor: Masaki Kitsunezuka
  • Patent number: 8965720
    Abstract: An efficiency monitor for monitoring the efficiency of power transmission by an inductive power outlet. The efficiency monitor includes an input power monitor, for measuring the input power delivered to the primary coil, and an output power monitor, for measuring the output power received by the secondary coil. The input and output powers are used by a processor to determine an index of power-loss. A circuit breaker may be used to disconnect the inductive power outlet in case of excessive power loss.
    Type: Grant
    Filed: December 6, 2013
    Date of Patent: February 24, 2015
    Assignee: Powermat Technologies, Ltd.
    Inventors: Yossi Azancot, Amir Ben-Shalom, Oola Greenwald, Arik Rofe
  • Patent number: 8847512
    Abstract: An electronic ballast is provided with a filament heating circuit having a Q factor clamped at a certain range of preheat frequency. An inverter circuit includes a controller and a pair of switches coupled between positive and negative terminals of a power supply. The switches respond to control signals from the controller to oscillate at an operating frequency and generate an output voltage. An inverter tank is coupled to an inverter output terminal and includes a first capacitor, a primary winding of a filament heating transformer coupled on a first end in series with the first capacitor, a second capacitor coupled to the second end of the primary winding, and a clamping circuit coupled to the second capacitor. The clamping circuit during a preheat mode of operation clamps an amplitude of the voltage across the primary winding to an amplitude of the input voltage from the power supply.
    Type: Grant
    Filed: October 29, 2010
    Date of Patent: September 30, 2014
    Assignee: Universal Lighting Technologies, Inc.
    Inventor: Wei Xiong
  • Patent number: 8767427
    Abstract: A power supply arrangement (MF) for a reactor (R) for producing polysilicon, with a frequency converter, with at least one input for receiving an input current from the supply grid with which the input is connected, and outputs for connecting one or several loads (3), via which the load(s) (3) can be supplied with an output current, wherein the power supply arrangement has a transformerless conversion circuit for converting the input current into an n-phase multiphase AC current, wherein the phase shift between chained voltages of an n-phase AC current system formed on the secondary side of the conversion circuit is 360°/n, wherein n is a natural number greater than or equal to two, wherein the supply arrangement (MF) has n outputs, wherein the outputs from a chain, and wherein one of the chained voltages of the n-phase AC current system is applied at each output.
    Type: Grant
    Filed: April 4, 2012
    Date of Patent: July 1, 2014
    Assignee: AEG Power Solutions B.V.
    Inventor: Peter Wallmeier
  • Patent number: 8755210
    Abstract: A method for controlling a frequency converter unit, the frequency converter unit containing an input connection for supplying electric power at an input frequency to the frequency converter unit, and an output connection for supplying electric power at an output frequency from the frequency converter unit, the method comprising a control step, in which the frequency converter unit is controlled by means of control signals. In the control step the control signals are supplied through an inductive connection to at least one wire connected to the input connection or the output connection of the frequency converter unit for transmitting electric power, the control signals being supplied to the frequency converter unit over the at least one wire.
    Type: Grant
    Filed: June 4, 2008
    Date of Patent: June 17, 2014
    Assignee: ABB Oy
    Inventor: Jani Kangas
  • Patent number: 8687397
    Abstract: A method and device for operating a direct converter circuit are provided. A control signal controls power semiconductor switches of switching cells of the associated phase module. The control signal is formed, for each phase module, from the difference between a reference signal relating to the voltage over the phase module and a voltage signal over the inductor. The voltage signal over the inductor is formed from a reference signal relating to the current through the corresponding phase module. The reference signal relating to the current through the phase module is formed from a respective mean value or instantaneous value of a phase power of a phase of the first and second current or voltage systems connected to the phase module and from respective sums of the instantaneous values or the mean values of the phase powers of the phases of the first and second current or voltage systems, respectively.
    Type: Grant
    Filed: June 18, 2012
    Date of Patent: April 1, 2014
    Assignee: ABB Schweiz AG
    Inventors: Manfred Winkelnkemper, Arthur Korn
  • Publication number: 20140022830
    Abstract: The present disclosure provides a method, includes: a first stepped-impedance transmission line configured to receive a first signal of a first differential signal; a second stepped-impedance transmission line configured to receive a second signal of the first differential signal, where the first stepped-impedance transmission line and the second stepped-impedance transmission line superpose the first signal of the first differential signal on the second signal of the first differential signal to obtain a first frequency multiplied signal; a first inverse stepped-impedance transmission line configured to be inversely ground-coupled with the first stepped-impedance transmission line and grounded at an end near an output end of the first stepped-impedance transmission line; a second inverse stepped-impedance transmission line configured to be inversely ground-coupled with the second stepped-impedance transmission line and grounded at an end near an output end of the second stepped-impedance transmission line.
    Type: Application
    Filed: September 17, 2013
    Publication date: January 23, 2014
    Applicant: Huawei Technologies Co., Ltd.
    Inventor: Xun Luo
  • Publication number: 20130155748
    Abstract: A conversion circuit (20) for converting a complex analog input signal having an in-phase, I, component and a quadrature-phase, Q, component resulting from frequency down conversion of a radio-frequency, RF, signal (XRF) to a frequency band covering 0 Hz into a digital representation is disclosed. It comprises a channel-selection filter unit (40) arranged to filter the complex analog input signal, thereby generating a channel-filtered I and Q components, and one or more processing units (53, 53a-b). Each processing unit comprises four mixers (60-75) for generating a first and a second frequency-translated I component and a first and a second channel-filtered Q component based on two LO signals with equal LO frequency and a 90° mutual phase shift. Furthermore, each processing unit comprises a combiner unit (85, 120) for generating a first, a second, a third, and a fourth combined signal proportional to sums and differences between said frequency translated I and Q components.
    Type: Application
    Filed: June 13, 2011
    Publication date: June 20, 2013
    Applicant: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)
    Inventors: Lars Sundström, Roland Strandberg
  • Publication number: 20130113642
    Abstract: Methods and apparatus for translating duty cycle information in duty-cycle-modulated signals to higher frequencies or higher data rates. An exemplary duty cycle translator includes a duty cycle evaluator, a high-speed digital counter, and a comparator. The duty cycle evaluator generates a first digital number representing a duty cycle of a low-frequency input duty-cycle-modulated (DCM) signal. The comparator compares the first digital number to a second digital number generated by the high-speed digital counter, and generates, based on the comparison, an output DCM signal having a higher frequency or data rate than the frequency or data rate of the low-frequency input DCM signal but a duty cycle that is substantially the same as the duty cycle of the low-frequency input DCM signal.
    Type: Application
    Filed: January 2, 2013
    Publication date: May 9, 2013
    Inventor: Earl W. McCune, JR.
  • Publication number: 20130094270
    Abstract: The present invention is applied to a frequency converter used for a receiver. The frequency converter according to the present invention includes an LO signal generator (11) that generates an LO signal and outputs the LO signal; and a mixer (10) that multiplies a received signal that has been band-limited to a usable bandwidth of said receiver by the LO signal so as to convert the frequency of the received signal and outputs the resultant signal. Said LO signal generator is capable of varying a phase resolution.
    Type: Application
    Filed: April 14, 2011
    Publication date: April 18, 2013
    Applicant: NEC Corporation
    Inventor: Masaki Kitsunezuka
  • Patent number: 8315077
    Abstract: [Object] The present invention provides a space vector modulation method for an AC-AC direct conversion device, which can convert input and output waveforms into sine waves and reduce the number of times of switching at an inter-sector shift. [Means to Solve] A vector state in which a line voltage of multi-phase AC output is expanded onto a two-phase static ?? coordinates is defined. Simple harmonic oscillation vector axes of a sector where an output voltage command value vector Vo* exists are defined as an X axis and a Y axis. Maximum/middle/minimum vectors in each axis, a zero vector that is an intermediate voltage of a phase voltage, and one rotation vector that is present in the sector, are set as base vectors. A switching selection pattern formed by a combination of four vectors among these vectors, which satisfies predetermined conditions, is determined by a selection means 15.
    Type: Grant
    Filed: March 12, 2008
    Date of Patent: November 20, 2012
    Assignee: Meidensha Corporation
    Inventor: Yugo Tadano
  • Publication number: 20120230077
    Abstract: An arrangement is described for receiving an electrical converter module for converting a first frequency of an electrical input signal into a second frequency of an electrical output signal. A rack includes input terminals for receiving the electrical input signal and output terminals for providing the electrical output signal. A slot receives the converter module in a first and second positions where in first position the converter module is electrically connected both to the input and output terminals and in the second position the converter module is electrically disconnected both from the input and output terminals. An actuator, which is mounted to the rack and which, in response to a disconnect trigger signal, is adapted to move the electrical converter module from the first position to the second position.
    Type: Application
    Filed: May 23, 2012
    Publication date: September 13, 2012
    Inventor: Thyge Skovbjerg Thomsen
  • Patent number: 8207699
    Abstract: An alternating current motor control system constituted of: a control unit; a cycloconverter functionality; a phase control functionality; and a semiconductor switching unit comprising a plurality of electronically controlled semiconductor switches each associated with a particular winding of a target alternating current motor and each independently responsive to the control unit. In one embodiment the semiconductor switching unit is arranged to connect the windings of the target alternating current motor to a three phase power input in one of a star and a delta configuration responsive to the control unit.
    Type: Grant
    Filed: July 8, 2009
    Date of Patent: June 26, 2012
    Assignee: InnoSave Ltd.
    Inventor: Arthur Naiman
  • Publication number: 20120126628
    Abstract: The inventions relates to a system for conditioning of power from a turbine, the turbine comprising at least one turbine blade (1) connected to a rotating hub (2), the rotating hub (2) is arranged to drive a generator (5). The generator is a multi pole synchronous generator (5) connected via a plurality of galvanic isolated three-phase cables (11) to a multi level frequency converter (25), the generator (5) also being arranged to feed current to the frequency converter (25) through the three-phase cables (11). The multi level frequency converter (25) is constituted by a plurality of elements arranged in columns and coupled in cascading order to add inverted voltage.
    Type: Application
    Filed: November 24, 2009
    Publication date: May 24, 2012
    Inventor: Ole Johan Bjerknes
  • Publication number: 20110279983
    Abstract: An arrangement is described for receiving an electrical converter module for converting a first frequency of an electrical input signal into a second frequency of an electrical output signal. A rack includes input terminals for receiving the electrical input signal and output terminals for providing the electrical output signal. A slot receives the converter module in a first and second positions where in first position the converter module is electrically connected both to the input and output terminals and in the second position the converter module is electrically disconnected both from the input and output terminals. An actuator, which is mounted to the rack and which, in response to a disconnect trigger signal, is adapted to move the electrical converter module from the first position to the second position.
    Type: Application
    Filed: April 20, 2011
    Publication date: November 17, 2011
    Inventor: Thyge Skovbjerg Thomsen
  • Publication number: 20110186096
    Abstract: The disclosure relates to a maintenance unit for servicing aircraft during stand-still, comprising electrically powered service and/or maintenance equipment. There is a power input for connecting the unit to an electrical power supply operating at 200/115VAC at 400 Hz. The unit further comprises a transformer and conversion unit (TCU) for transforming the 200/115 VAC/400 Hz power to standard grid voltage at 400/23OVAC at 50 Hz and at least one frequency converter enabling variable frequency of the output voltage, for powering said service and/or maintenance equipment. The maintenance equipment may be a gas turbine engine washing equipment and comprises a water delivery member for supplying water from a water source, a high pressure pump coupled to the water providing means for providing pressurized water, and a high pressure water outlet connection for connecting cleaning devices.
    Type: Application
    Filed: February 2, 2010
    Publication date: August 4, 2011
    Applicant: GAS TURBINE EFFICIENCY SWEDEN AB
    Inventors: Sebastian Nordlund, Henrik Amcoff, Helena Nyberg
  • Publication number: 20110069520
    Abstract: A frequency converter includes a housing, a frequency conversion component installed in the housing, a controller that controls the frequency conversion component, and a user interface that transmits control commands from a user to the controller. The controller of the frequency converter are provided with a load examination function that examines whether a load is connected to an output of the frequency conversion component, the controller raising an output frequency of the frequency conversion component to a desired value in response to a load connected to the frequency conversion component and detected by the load examination function.
    Type: Application
    Filed: September 22, 2010
    Publication date: March 24, 2011
    Applicant: ABB OY
    Inventor: Jussi Rantanen
  • Publication number: 20110051013
    Abstract: A front-end circuit according to the present invention includes a VCO which oscillates a local signal, a mixer which converts an RF signal Frf into a baseband signal, a DC offset cancel circuit which detects a DC offset contained in the baseband signal and then eliminates the DC offset, and a local frequency control circuit which controls a frequency of the local signal. In a case where the RF signal is an analog television signal, the local frequency control circuit controls the frequency of the local signal so that a frequency of the baseband signal differs from each frequency spectrum of a luminance signal contained in a video signal which is generated by demodulating the baseband signal. This makes it possible to provide the front-end circuit which can prevent video distortion caused when a frequency spectrum is eliminated from the luminance signal.
    Type: Application
    Filed: June 24, 2010
    Publication date: March 3, 2011
    Inventors: Mutsumi Hamaguchi, Tsuyoshi Itaya
  • Publication number: 20110051481
    Abstract: The present invention provides a frequency converter including a frequency conversion device capable of accommodating a Si-series MMIC and also a GaAs-series MMIC by using a magneto-resistance element. A frequency converter according to an embodiment of the present invention includes: a frequency conversion device having a magneto-resistance element with a magnetization free layer, an intermediate layer, and a magnetization pinned layer; a magnetic field application mechanism for applying a magnetic field to the frequency conversion device; a local oscillator for applying a local oscillation signal to the frequency conversion device; and an input terminal electrically connected to the above frequency conversion device for receiving an external input signal. Further, the local oscillator includes a magneto-resistance element capable of generating the local oscillation signal by outputting an AC voltage according to a resistance change thereof.
    Type: Application
    Filed: March 10, 2010
    Publication date: March 3, 2011
    Applicant: CANON ANELVA CORPORATION
    Inventor: Hiroki Maehara
  • Patent number: 7821802
    Abstract: A power converter directly converting an AC voltage into an AC voltage of any desired magnitude and frequency by turning bidirectional switches ON and OFF without employing any energy buffer, where the peak values of output phase voltage command values are limited, to bring the amplitude of an output line voltage to, at most, 0.866 times the amplitude of the supply line voltages. By way of example, the peak-value limit of the output phase voltage command values is set so that the maximum value of the output phase voltage command values becomes, at most, 0.75 times the maximum value of supply phase voltages, while the minimum value thereof becomes, at least, 0.75 times the minimum value of the supply phase voltages. This control method for the direct power converter dispenses with an expensive dedicated motor, and permits a reduction in cost of the control apparatus as a whole.
    Type: Grant
    Filed: July 31, 2007
    Date of Patent: October 26, 2010
    Assignee: Fuji Electric Systems Co., Ltd.
    Inventors: Akihiro Odaka, Ikuya Sato, Yasuhiro Tamai
  • Patent number: 7817453
    Abstract: A ballast circuit that facilitates providing thermal protection for a fluorescent lamp includes a coupling transformer that couples an inverter circuit to a control circuit. First and second transformer windings in the inverter circuit, and a third transformer winding in the control circuit, are wound around a common ferrite core. The ferrite core has a Curie temperature that approximates a maximum allowable threshold temperature for the lamp. When the temperature of the ballast approaches the Curie temperature of the ferrite core, its permeability, and thus inductance, drops dramatically, causing an increase in operating frequency in the inverter circuit. This increased operating frequency causes a capacitor in the control circuit to charge to a threshold voltage, at which power to the inverter circuit is reduced. The lamp then dims without turning off until the temperature is reduced to an acceptable level.
    Type: Grant
    Filed: June 18, 2008
    Date of Patent: October 19, 2010
    Assignee: General Electric Company
    Inventor: Louis Robert Nerone
  • Patent number: 7800929
    Abstract: A control method for a PWM cyclo-converter is provided in which a voltage can be accurately generated even when a voltage command is small. In the PWM cyclo-converter, the turning on and off operations of two-way semiconductor switch are repeated at intervals of short time. As switching patterns, within the intervals of short time, a first terminal of output side terminals outputs in order a maximum potential phase P, an intermediate potential phase M and the maximum potential phase N, a second terminal of the output side terminals outputs in order the maximum potential phase P, the intermediate potential phase M, a minimum potential phase N, the intermediate potential phase M and the maximum potential phase P, and a third terminal of the output side terminals outputs in order the intermediate potential phase M, the minimum potential phase N and the intermediate potential phase M.
    Type: Grant
    Filed: March 25, 2005
    Date of Patent: September 21, 2010
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Eiji Yamamoto, Hidenori Hara, Jun-Koo Kang
  • Patent number: 7768480
    Abstract: A problem is to be solved that there is to be provided a plasma display device capable of generating driving signals with less variation in delay time and without carrying out any phase adjustment. There is provided a plasma display device including; a first display electrode; a second display electrode adapted to cause a discharge to occur between the first display electrode and the second display electrode; a first display electrode drive circuit for applying a discharge voltage to the first display electrode; and a second display electrode drive circuit for applying a discharge voltage to the second display electrode. The first display electrode drive circuit has a first output element for supplying a first electric potential to the first display electrode in accordance with a first input signal which is inputted by using a transformer.
    Type: Grant
    Filed: November 18, 2005
    Date of Patent: August 3, 2010
    Assignee: Fujitsu Hitachi Plasma Display Limited
    Inventors: Makoto Onozawa, Tomokatsu Kishi, Hideaki Ohki, Masaki Kamada
  • Patent number: 7710063
    Abstract: An electric power converter, electric power conversion system and method that, without using a DC-DC converter, uses and allots the electric power of plural power sources while reducing the volume and losses. At least one phase of the motor is connected to plural power sources and generates and synthesizes pulses from output voltages of plural power sources so as to drive the multi-phase AC motor. A different phase of the motor is connected to one DC power source and generates pulses from the output voltage of the power source so as to generate a driving voltage for the multi-phase AC motor. This arrangement allows use/allotment of the power of plural power sources with a reduced number of semiconductor components.
    Type: Grant
    Filed: March 15, 2007
    Date of Patent: May 4, 2010
    Assignee: Nissan Moto Co., Ltd.
    Inventors: Kantaro Yoshimoto, Yasuhiko Kitajima, Kengo Maikawa
  • Publication number: 20100104313
    Abstract: A power source device includes an oscillator generating a clock, a frequency division unit dividing the clock to output a pulse, a sequence generation unit generating sequences “N” with respect to each switching of the pulse, a frequency division ratio setting unit setting frequency division ratio, a switching element driven by the pulse, and a piezoelectric transformer outputting alternating high voltage from a secondary-side when a primary-side is applied with voltage. The generated sequence and the set frequency division ratio are compared to output the pulses of fractional-M, ?M+1 frequencies. An average frequency division ratio of the pulses of fractional-M, ?M+1 frequencies determined by (M×?)+(M+1)×?/(?+?), where ? and ? respectively represent the number of pulses of “M” and “M+1” per unit time. The average frequency division ratio and frequency division ratio become equal at a sequence generation cycle and approximated in a period shorter than the sequence generation cycle.
    Type: Application
    Filed: October 23, 2009
    Publication date: April 29, 2010
    Applicant: OKI DATA CORPORATION
    Inventors: Toru KOSAKA, Masao YAJI, Akira HAGIWARA
  • Publication number: 20100091534
    Abstract: [Object] The present invention provides a space vector modulation method for an AC-AC direct conversion device, which can convert input and output waveforms into sine waves and reduce the number of times of switching at an inter-sector shift. [Means to Solve] A vector state in which a line voltage of multi-phase AC output is expanded onto a two-phase static ?? coordinates is defined. Simple harmonic oscillation vector axes of a sector where an output voltage command value vector Vo* exists are defined as an X axis and a Y axis. Maximum/middle/minimum vectors in each axis, a zero vector that is an intermediate voltage of a phase voltage, and one rotation vector that is present in the sector, are set as base vectors. A switching selection pattern formed by a combination of four vectors among these vectors, which satisfies predetermined conditions, is determined by a selection means 15.
    Type: Application
    Filed: March 12, 2008
    Publication date: April 15, 2010
    Inventor: Yugo Tadano
  • Patent number: 7599204
    Abstract: A method includes controlling the cyclo-converter 7 in coordination with controlling a coupled HF inverter 3. The controlling of the cyclo-converter 7 provides at least a first freewheeling FW period in the cyclo-converter for each cycle of the HF inverter 3. The controlling of the HF inverter provides a freewheeling period in the HF inverter 3 each time the first freewheeling period is provided in the cyclo-converter.
    Type: Grant
    Filed: August 29, 2006
    Date of Patent: October 6, 2009
    Assignee: GM Global Technology Operations, Inc.
    Inventors: Lateef A. Kajouke, Silva Hiti
  • Publication number: 20090141526
    Abstract: Disclosed is a system and method for synchronizing switching regulators in an electronic system so that switching interference from the regulators may be kept from a given spectral region of interest. The system does this by selecting a master clock frequency such that each of the switching frequencies corresponding to each of the switching regulators is a harmonic of a fundamental frequency. Further, the master clock frequency is selected so that none of the switching regulators, each of which are driven by an harmonic of the fundamental frequency, generates switching interference in the spectral region of interest. Each of the switching regulators has a synchronization clock, which multiplies or divides the master clock frequency by an allocated harmonic factor. Each harmonic factor is selected to that the switching frequency is within the operating range of the particular switching regulator.
    Type: Application
    Filed: January 29, 2009
    Publication date: June 4, 2009
    Applicant: HONEYWELL INTERNATIONAL INC.
    Inventor: DONGWEN JIANG
  • Publication number: 20080283514
    Abstract: A heated frequency converter assembly having a resistor element and/or brake means that are configured to heat the frequency converter assembly to produce a sufficiently high operating temperature and/or to prevent moisture condensation.
    Type: Application
    Filed: May 9, 2008
    Publication date: November 20, 2008
    Applicant: ABBY OY
    Inventor: Jani KANGAS
  • Patent number: 7453224
    Abstract: A circuit and method for detecting an operating transition of a mechanical apparatus driven by a hydraulic prime mover comprising a hydraulic pump driven by an electric motor, the operating transition causing a change in the force applied by the mechanical apparatus on the prime mover. A motor current sensing circuit is connected in a motor power supply circuit to provide a motor current signal representing motor current. A bandpass filter receives the motor current signal and provides a filtered motor current signal consisting essentially of motor current signal components in the frequency range from a lower frequency boundary greater than zero Hz to an upper frequency boundary below substantially all the motor noise frequencies. A comparison circuit compares the filtered motor current signal to a first selected threshold level and outputs a signal representing the occurrence of the operating transition when the filtered motor current signal exceeds the selected threshold level.
    Type: Grant
    Filed: December 28, 2005
    Date of Patent: November 18, 2008
    Assignee: InPower LLC
    Inventor: James D. Sullivan
  • Patent number: 6992907
    Abstract: The present invention relates a waveform transformation method and apparatus. It uses multilevel transformation module in series, and the output voltages of power modules at all levels are superposed to get the total output voltage, whereas each power transformation module realizes AC-to-AC direct conversion. The deviation between the output? voltage and setting reference voltage at any time point is made as small as possible by selecting different transformation modules as current working circuit and selecting output voltage waveform of the each different transformation modules. The invention includes outputting n groups of electrical insulating AC and n transfonnation modules connected with AC. The wave transformation method and device of present invention eliminates the intermediate DC stage, so that the circuit is greatly simplified, the cost is reduced obviously and improve working efficiency. It makes voltage and current harmonics to be reduced and obtains higher power factor.
    Type: Grant
    Filed: December 5, 2001
    Date of Patent: January 31, 2006
    Inventor: Dongsheng Zhang
  • Patent number: 6825647
    Abstract: A method for testing a frequency converter having individual switching elements and motor connectors for each phase of the frequency converter. The method includes selectively activating the individual switching elements of the frequency converter and applying a control pattern to a control input of each phase of the frequency converter. Registering voltage patterns occurring at the motor connectors for each phase of the frequency converter, wherein the registering is performed for each of the motor connectors via a single test line that is capacitively connected to the motor connectors. Comparing the control pattern applied to the control input with the voltage patterns registered for each phase of the frequency converter. Detecting a malfunction in the frequency converter in case of a deviation of the voltage patterns, registered at the motor connectors, from voltage patterns expected as a result of the control pattern applied to the control input.
    Type: Grant
    Filed: April 16, 2003
    Date of Patent: November 30, 2004
    Assignee: Dr. Johannas Heidenhain GmbH
    Inventor: Walter Kranitzky
  • Publication number: 20040208033
    Abstract: A method and an apparatus for controlling the mains bridge of a four-quadrant PWM frequency converter provided with a DC intermediate circuit when the power is flowing in the direction towards the supply network, said frequency converter being provided with an AC inductor (9) to be connected to an alternating voltage source (UU, UV, UW), a controlled mains bridge (10), a DC intermediate circuit (14) and a controlled load bridge (11) for feeding a variable-frequency alternating voltage (US, UR, UT) into a load (12), and said mains bridge being provided with controlled semiconductor switches (V1-V6) and shunt diodes (D1-D6), and wherein the mains bridge (10) is mainly controlled in such manner that the controlled semiconductor switch in the upper branch of the phase having the highest supply voltage instantaneous value and the controlled semiconductor switch in the lower branch of the phase having the lowest supply voltage instantaneous value are conducting.
    Type: Application
    Filed: April 8, 2004
    Publication date: October 21, 2004
    Inventor: Risto Komulainen
  • Patent number: 6798678
    Abstract: There is provided a frequency voltage converter comprises a first transmission line for transmitting an input signal and a second transmission line provided with a delay line circuit, a third transmission line for transmitting a reference signal and a fourth transmission line provided with a delay line circuit, a mixer circuit, and a locked loop having a control circuit for outputting the same control signal to control portions of both delay line circuits so that the amount of a delay by the delay line circuit reaches one cycle of the reference signal, thereby holding linearity with respect to the frequency of a modulated wave signal and executing frequency voltage conversion even when a center frequency is low.
    Type: Grant
    Filed: July 9, 2001
    Date of Patent: September 28, 2004
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Hiroshi Komurasaki, Hisayasu Sato, Takahiro Miki
  • Patent number: 6694438
    Abstract: Method and apparatus are disclosed for controlling the delivery of power to DC components such as computer components, microprocessors or the like. Designs of voltage regulation modules are presented which are appropriate for faster components, lower voltages, and higher currents. Embodiments are especially suited to applications which cause rapid changes in the conductance of the load, even in the sub-microsecond time domain as is common in computer applications and the like and in powering electronics equipment, especially a distributed system and especially a system wherein low voltage at high current is required.
    Type: Grant
    Filed: May 31, 2000
    Date of Patent: February 17, 2004
    Assignee: Advanced Energy Industries, Inc.
    Inventors: Robert M. Porter, Gennady G. Gurov, Anatoli V. Ledenev
  • Publication number: 20030012041
    Abstract: The invention relates to a frequency converter (8) for an immersion vibrator (1), comprising a mobile converter housing (9), and a converter circuit disposed in said converter housing (9) and adapted to convert an electrical supply voltage to a special voltage. The converter is further provided with a feed line (10) that is mechanically linked with the converter housing (9) and electrically connected to the converter circuit. At the end of said feed line facing away from the converter housing (9) a plug part (11) is disposed. The converter circuit feeds a connector (12) with the special voltage, a plug part (7) of the immersion vibrator (1) being insertable into said connector.
    Type: Application
    Filed: July 22, 2002
    Publication date: January 16, 2003
    Inventor: Michael Steffen
  • Publication number: 20020111611
    Abstract: Improved devices, systems, and methods use a Non-Liner Optic (NLO) to effect a conversion of an input laser energy to an output energy. The output energy will have a wavelength which is different than the input energy, and the conversion will vary in response to both an angle of the energy relative to the NLO and a temperature of the NLO. Passive control over the angle of the NLO based on thermal expansion of a member thermally coupled to the NLO can compensate for the temperature-induced change in the conversion so as to maintain a desired output frequency, conversion efficiency, phase matching, and/or the like.
    Type: Application
    Filed: April 11, 2002
    Publication date: August 15, 2002
    Applicant: VISX, Incorporated, A Delaware Corporation
    Inventor: George Caudle
  • Publication number: 20020097592
    Abstract: There is provided a frequency voltage converter comprises a first transmission line for transmitting an input signal and a second transmission line provided with a delay line circuit, a third transmission line for transmitting a reference signal and a fourth transmission line provided with a delay line circuit, a mixer circuit, and a locked loop having a control circuit for outputting the same control signal to control portions of both delay line circuits so that the amount of a delay by the delay line circuit reaches one cycle of the reference signal, thereby holding linearity with respect to the frequency of a modulated wave signal and executing frequency voltage conversion even when a center frequency is low.
    Type: Application
    Filed: July 9, 2001
    Publication date: July 25, 2002
    Inventors: Hiroshi Komurasaki, Hisayasu Sato, Takahiro Miki
  • Patent number: 6388907
    Abstract: The present invention relates to an arrangement in a frequency converter whose substantial part is an embedding frame (4). The frequency converter (1) is mounted in a set of casings, in which a cover part (7) of at least one casing comprises an opening (8), in which is arranged the embedding frame (4) comprising a frame part (4A) connected to the cover part (7) of the embedding frame (4) and a substantially enclosed tub-like recess (4B) that substantially protrudes inside the casing from the frame part (4A), whereby the control part (3) of the frequency converter (1) is arranged in the recess (4B) of the embedding frame (4).
    Type: Grant
    Filed: April 10, 2001
    Date of Patent: May 14, 2002
    Assignee: Vacon Oyj
    Inventor: Longinos Larikka
  • Patent number: 6385069
    Abstract: The present invention relates to a frequency converter comprising a power part and a control and adjustment part. The frequency converter is characterized in that the control and adjustment part is arranged to be a separate control and adjustment unit separated from the power part and in that the control and adjustment unit forming the control and adjustment part is arranged to be connected to the power part by a telecommunication unit. The telecommunication unit is a wired optic connection or a wireless connection, the control and adjustment part and the power part then being galvanically separated.
    Type: Grant
    Filed: March 2, 2001
    Date of Patent: May 7, 2002
    Assignee: Vacon Oyj
    Inventors: Osmo Miettinen, Jukka Jaskari
  • Patent number: 6313449
    Abstract: A fusion joining apparatus includes an electrical power source, a first frequency converter coupled to the electrical power source, a connector for connection to an induction fusion heater, a second frequency converter and a controller. During operation, the electrical power source generates source electrical power at a source voltage and a source frequency. The first frequency converter steps up the voltage and the frequency of the source electrical power to produce high voltage electrical power. The second frequency converter reduces the voltage and frequency of the high voltage electrical power and produces low voltage electrical power. The second frequency converter has terminals for connection to a resistance fusion heater to provide the low voltage electrical power to the resistance fusion heater.
    Type: Grant
    Filed: July 10, 2000
    Date of Patent: November 6, 2001
    Assignee: Uponor Aldyl Company
    Inventors: Cin Smith, Goran Perica, Randy J. Bleske, Steve Kinney
  • Publication number: 20010036098
    Abstract: The present invention relates to an arrangement in a frequency converter whose substantial part is an embedding frame (4). The frequency converter (1) is mounted in a set of casings, in which a cover part (7) of at least one casing comprises an opening (8), in which is arranged the embedding frame (4) comprising a frame part (4A) connected to the cover part (7) of the embedding frame (4) and a substantially enclosed tub-like recess (4B) that substantially protrudes inside the casing from the frame part (4A), whereby the control part (3) of the frequency converter (1) is arranged in the recess (4B) of the embedding frame (4).
    Type: Application
    Filed: April 10, 2001
    Publication date: November 1, 2001
    Applicant: VACON OYJ
    Inventor: Longinos Larikka
  • Publication number: 20010021116
    Abstract: The present invention relates to a converter motor with an energy recovery capability, comprising a motor and a self-commutating direct converter, the use of which results in a compact converter motor with an energy recovery capability, which can be used as a four-quadrant drive.
    Type: Application
    Filed: March 8, 2001
    Publication date: September 13, 2001
    Applicant: SIEMENS AG.
    Inventors: Manfred Bruckmann, Bernhard Piepenbreier, Walter Springmann
  • Publication number: 20010019495
    Abstract: The present invention relates to a frequency converter comprising a power part and a control and adjustment part. The frequency converter is characterized in that the control and adjustment part is arranged to be a separate control and adjustment unit separated from the power part and in that the control and adjustment unit forming the control and adjustment part is arranged to be connected to the power part by a telecommunication unit. The telecommunication unit is a wired optic connection or a wireless connection, the control and adjustment part and the power part then being galvanically separated.
    Type: Application
    Filed: March 2, 2001
    Publication date: September 6, 2001
    Applicant: VACON OYJ
    Inventors: Osmo Miettinen, Jukka Jaskari
  • Patent number: 5920155
    Abstract: An electronic ballast for discharge lamps comprises a main resonance circuit for applying a voltage necessary for operating of a discharge lamp having filaments to both ends of the discharge lamp and a filament resonance circuit for supplying a filament current to the filaments, wherein the main resonance circuit and filament resonance circuit have resonance circuits having different resonance characteristics in an output path leading to the discharge lamp and also change their outputs depending on an operating frequency of switching elements. Thereby a filament current and a voltage across the discharge lamp can be set at suitable one of respective operational modes of the discharge lamp according to an operational state of the discharge lamp.
    Type: Grant
    Filed: October 27, 1997
    Date of Patent: July 6, 1999
    Assignee: Matsushita Electric Works, Ltd.
    Inventors: Takashi Kanda, Kazuo Yoshida, Masahiro Naruo, Kazuhiro Hori, Masahito Ohnishi
  • Patent number: 5517179
    Abstract: A batteryless, portable frequency divider, such as used in presence detection systems for article surveillance or as used for article-location determination, includes a series LC resonant circuit connected directed across a parallel LC resonant circuit. One circuit is resonant at a first frequency and the other circuit is resonant at a second frequency that is a plural-integer-divided quotient of the first frequency. In one class of embodiments, either or both of the series and parallel resonant circuits includes a variable capacitance element, such as a varactor, in which the capacitance varies in accordance with the voltage across the variable capacitance element. The variation of the capacitance of the variable capacitance element in response to variations in energy in the higher-frequency resonant circuit resulting from receipt electromagnetic radiation at the first frequency causes the lower-frequency resonant circuit to transmit electromagnetic radiation at the second frequency.
    Type: Grant
    Filed: May 18, 1995
    Date of Patent: May 14, 1996
    Assignee: XLINK Enterprises, Inc.
    Inventor: Lincoln H. Charlot, Jr.
  • Patent number: 5241298
    Abstract: A batteryless, portable, frequency divider includes a first resonant circuit that is resonant at a first frequency for receiving electromagnetic radiation at the first frequency; and a second resonant circuit that is resonant at a second frequency that is one-half the first frequency for transmitting electromagnetic radiation at the second frequency; and a circuit element electrically connecting the first resonant circuit to the second resonant circuit.
    Type: Grant
    Filed: March 18, 1992
    Date of Patent: August 31, 1993
    Assignee: Security Tag Systems, Inc.
    Inventors: Ming R. Lian, Fred W. Herman
  • Patent number: 5222016
    Abstract: According to this invention, a frequency converter comprises a frequency mixer (11) formed in a semiconductor integrated circuit (10), an impedance conversion/signal amplitude limit differential amplifier (12) formed in the semiconductor integrated circuit and connected to the output of the frequency mixer, a first frequency mixing output terminal (14) connected to an output terminal of the frequency mixer and serving as an external terminal of the semiconductor integrated circuit, and a second frequency mixing output terminal (15) connected to an output terminal of the differential amplifier and serving as an external terminal of the semiconductor integrated circuit.
    Type: Grant
    Filed: July 29, 1991
    Date of Patent: June 22, 1993
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Susumu Matsumoto, Masaru Hashimoto