Current And Frequency (e.g., F1-f2-d.c.) Patents (Class 363/8)
  • Patent number: 9912197
    Abstract: A dual-mode receiver is provided that includes an electromagnetic resonator having one or more inductive elements that are arranged to form a receiver coil and a network of passive components arranged to form a matching network. The electromagnetic resonator includes a first selective frequency defined in a low frequency range and a second selective frequency defined in a high frequency range allowing for a rectification circuit to operate in both the high frequency range and low frequency range making maximum use of active circuits.
    Type: Grant
    Filed: August 1, 2013
    Date of Patent: March 6, 2018
    Assignee: MEDIATEK Singapore Pte. Ltd.
    Inventor: Patrick Stanley Riehl
  • Patent number: 9893567
    Abstract: A dual-mode receiver is provided that includes an electromagnetic resonator having one or more inductive elements that are arranged to form a receiver coil and a network of passive components arranged to form a matching network. The electromagnetic resonator includes a first selective frequency defined in a low frequency range and a second selective frequency defined in a high frequency range allowing for a rectification circuit to operate in both the high frequency range and low frequency range making maximum use of active circuits.
    Type: Grant
    Filed: May 16, 2016
    Date of Patent: February 13, 2018
    Assignee: MEDIATEK Singapore Pte. Ltd.
    Inventor: Patrick Stanley Riehl
  • Patent number: 9859744
    Abstract: A dual-mode receiver is provided that includes an electromagnetic resonator having one or more inductive elements that are arranged to form a receiver coil and a network of passive components arranged to form a matching network.
    Type: Grant
    Filed: February 17, 2014
    Date of Patent: January 2, 2018
    Assignee: MEDIATEK Singapore Pte. Ltd.
    Inventor: Patrick Stanley Riehl
  • Patent number: 9632121
    Abstract: The present invention relates to electronic power converter suitable, in a first mode, for receiving electrical voltage and/or current magnitudes from a first device as input, for processing them using processing means capable of measuring said electrical magnitudes and servocontrolling said electrical magnitudes based on said measurements and constraints specific to a second device, and for providing the adapted voltage and/or current magnitudes to said second device.
    Type: Grant
    Filed: May 15, 2012
    Date of Patent: April 25, 2017
    Assignees: CENTRE NATIONAL DE RECHERCHE SCIENTIFIQUE, UNIVERSITE DE FRANCHE-COMTE
    Inventors: Daniel Depernet, Oumar Ba, Alain Berthon
  • Patent number: 9231466
    Abstract: The invention provides an electronic circuit capable of reducing surge voltage while reducing switching loss when a MOSFET is turned off. A capacitor (91) is connected between apart closer to a first power source terminal (31) of a U-phase module (3) in a bus bar (61a) and a part closer to a second power source terminal (32) of the U-phase module (3) in a bus bar (64a). A capacitor (92) is connected between apart closer to a first power source terminal (41) of a V-phase module (4) in a bus bar (62) and a part closer to a second power source terminal (42) of the V-phase module (4) in a bus bar (65). A capacitor (93) is connected between a part closer to a first power source terminal (51) of a W-phase module (5) in a bus bar (63) and a part closer to a second power source terminal (52) of the W-phase module (5) in a bus bar (66).
    Type: Grant
    Filed: September 20, 2012
    Date of Patent: January 5, 2016
    Assignee: ROHM CO., LTD.
    Inventor: Masashi Hayashiguchi
  • Patent number: 9153375
    Abstract: A power electronic device is disclosed. The power electronic device may include a housing, a conductive element positioned within the housing and rated for at least a medium voltage, a cooling system in fluid communication with the conductive element, a plurality of temperature sensing tags and a data collection unit having a receiver that is configured to receive signals from the antennae of the temperature sensing tags. The cooling system may have a plurality of outlet conduit elements that are positioned within the housing. Each of the tags may be attached to one of the outlet conduits and may include a power supply, a temperature sensor, and an antenna.
    Type: Grant
    Filed: August 15, 2012
    Date of Patent: October 6, 2015
    Assignee: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Bernd Köhler, Richard H. Osman, Stefan von Dosky, Herbert Schorb
  • Patent number: 9148065
    Abstract: The invention puts forward a bidirectional DC-DC converter for high voltages that is as simple as possible and that entails as few losses as possible. The bidirectional DC-DC converter (1) converter comprises an input stage (2) to convert a DC input voltage into first AC voltage, a transformer (3) to transform the first AC voltage into a second AC voltage, and an output stage (4) to convert the second AC voltage into a DC output voltage, whereby, in order to provide the first and/or second AC voltage, at least one of the input stages (2) and/or output stages (4) comprises a branch of a multi-level converter (5) with a first number of active first semiconductor switches (61).
    Type: Grant
    Filed: February 27, 2012
    Date of Patent: September 29, 2015
    Assignee: RHEINISCH-WESTFÄLISCH-TECHNISCHE HOCHSCHULE AACHEN
    Inventors: Stephan Thomas, ir Rik W. A. A. De Doncker, Robert Lenke
  • Patent number: 8599577
    Abstract: Systems and methods are provided for delivering energy using an energy conversion module. An exemplary method for delivering energy from an input interface to an output interface using an energy conversion module coupled between the input interface and the output interface comprises the steps of determining an input voltage reference for the input interface based on a desired output voltage and a measured voltage at the output interface, determining a duty cycle control value based on a ratio of the input voltage reference and the measured voltage, operating one or more switching elements of the energy conversion module to deliver energy from the input interface to the output interface with a duty cycle influenced by the duty cycle control value.
    Type: Grant
    Filed: November 8, 2010
    Date of Patent: December 3, 2013
    Assignee: GM Global Technology Operations LLC
    Inventors: Lateef A. Kajouke, Milun Perisic, Ray M. Ransom
  • Publication number: 20130314948
    Abstract: Circuit topologies and control methods for a multi-phase grid interface are described. In at least one embodiment, a power conversion circuit is provided that includes an inverter stage, a transformer stage, and a cycloconverter stage. The cycloconverter stage may include one cycloconverter circuit for each of multiple phases associated with a multi-phase grid. In some embodiments, each cycloconverter circuit may include first and second half-bridge circuits coupled back-to-back.
    Type: Application
    Filed: March 12, 2013
    Publication date: November 28, 2013
    Inventors: David J. Perreault, Brandon J. Pierquet
  • Patent number: 8559193
    Abstract: Method for operating an ac/ac converter circuit for a high-frequency-link converter. The ac/ac converter circuit converts an ac input voltage to an ac output voltage. When the ac input voltage is zero, each of a pair of switches for both first and second arms are caused to be on. Current flows through the first arm along a first direction and through the second arm along a second, opposite direction. Next, when the ac input voltage is zero, a selected switch in the second arm is caused to be turned off. The position of the switches can be maintained as the ac input voltage transitions to a dc level, reaches the dc level, approaches zero, and again reaches zero. When the ac input voltage again reaches zero, the selected switch for the second arm is caused to be turned on.
    Type: Grant
    Filed: January 22, 2011
    Date of Patent: October 15, 2013
    Assignee: The Board of Trustees of the University of Illinois
    Inventor: Sudip K. Mazumder
  • Patent number: 8294411
    Abstract: A sensorless induction motor control device with a function of correcting a slip frequency wherein a slip frequency estimation unit estimates the slip frequency from at least one kind of current flowing through the motor. A voltage command value calculation unit calculates a D-phase voltage command value and a Q-phase voltage command value which are used for controlling a voltage applied to the motor using a Q-phase current command value calculated based on a difference between a speed estimation value, which is calculated using an estimation value of the slip frequency, and an externally supplied speed command value. An ideal voltage command value determination unit determines an ideal voltage command value using the speed command value and the Q-phase current command value. An actual voltage command value calculation unit calculates an actual voltage command value using the D-phase voltage command value and the Q-phase voltage command value.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: October 23, 2012
    Assignee: Fanuc Corporation
    Inventors: Tadashi Okita, Takahiro Akiyama, Tomohisa Tsutsumi
  • Patent number: 8199545
    Abstract: A power-conversion control system includes an inverter, a cycloconverter, and a sliding mode controller. The inverter is operable to receive a DC voltage input and produce a first AC voltage output having a first frequency. The cycloconverter has a plurality of bidirectional switches, and is operable to receive the first AC voltage and to synthesize a second AC voltage having a second frequency that is lower than the first frequency. The sliding mode controller is operable to provide a control signal to command the plurality of bidirectional switches to turn OFF and ON when the first AC voltage is at a zero crossing condition. The sliding mode controller is also operable to selectively adjust the frequency and amplitude of the second AC voltage.
    Type: Grant
    Filed: May 5, 2009
    Date of Patent: June 12, 2012
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Vietson M. Nguyen, Gregory I. Rozman, Sastry V. Vedula
  • Patent number: 8174849
    Abstract: An electric power converter facilitates performing soft switching in the two-way electric-power-conversion operation thereof, and reducing the manufacturing costs thereof and the losses caused therein, The electric power converter includes a first switching device; a second switching device; a first series circuit including capacitor, a diode, the primary winding of transformer, and a third switching device; a second series circuit including a capacitor, a fourth switching device, the primary winding of transformer, and a diode; a third series circuit including a diode and the secondary winding of transformer; and a voltage clamping element connected in parallel to the primary winding of transformer. The first series circuit is connected in parallel to the first switching device, and the second series circuit is connected in parallel to second switching device. The third series circuit is connected between the DC output terminals.
    Type: Grant
    Filed: May 31, 2011
    Date of Patent: May 8, 2012
    Assignee: Fuji Electric Co., Ltd.
    Inventor: Masakazu Gekinozu
  • Patent number: 8164308
    Abstract: There is provided an apparatus for capturing cosmic background radiation and for converting cosmic background radiation into electricity. An antenna is configured so as to capture cosmic background radiation. An electrostatic electron multiplier is connected to the antenna. A high voltage power supply is connected to the electrostatic electron multiplier whereby cosmic background radiation is converted to electricity.
    Type: Grant
    Filed: June 23, 2010
    Date of Patent: April 24, 2012
    Inventor: Stefan Juchnowycz
  • Patent number: 7903442
    Abstract: An alternating current (AC) to direct current (DC) power converter comprises a first electrical path in a primary circuit having an inductor coupled in series with a first primary winding and a first switch to a ground connection. A second electrical path in the primary circuit has the inductor coupled in series with a second primary winding and a second switch to the ground connection. A secondary circuit is electromagnetically coupled to the primary circuit. A controller operates the first switch and the second switch in a predetermined manner to induce a current in the secondary circuits.
    Type: Grant
    Filed: November 30, 2006
    Date of Patent: March 8, 2011
    Assignee: Dell Products L.P.
    Inventors: Brent McDonald, Brian P. Johnson
  • Patent number: 7643312
    Abstract: An apparatus for a wireless power supply including a mechanism for receiving a range of RF radiation across a collection of frequencies. The apparatus includes a mechanism for converting the RF radiation across the collection of frequencies, preferably at a same time into DC. A method for a wireless power supply including the steps of receiving a range of RF radiation across a collection of frequencies. There is the step of converting the RF radiation across the collection of frequencies, preferably at a same time into DC.
    Type: Grant
    Filed: February 17, 2006
    Date of Patent: January 5, 2010
    Assignee: Powercast Corporation
    Inventors: Timm A. Vanderelli, John G. Shearer, John R. Shearer
  • Publication number: 20090073156
    Abstract: A drive circuit for driving electroluminescent (EL) segments and polymer dispersed liquid crystal (PDLC) segment of a display. The circuit may include a flyback converter for generating an A.C. output voltage, a first switching circuit for selectively connecting the output voltage to the EL segments, and a second switching circuit for selectively connecting the output voltage to the PDLC segments. In order to drive the EL segments and PDLC segments at the required frequencies, the polarity of the output voltage applied to the PDLC segments is swapped at a frequency lower than the frequency at which the polarity of the output voltage is swapped for the EL segments. In this way, only a single high voltage power supply is required to drive both the EL and PDLC segments.
    Type: Application
    Filed: January 25, 2007
    Publication date: March 19, 2009
    Applicant: PELIKON LIMITED
    Inventors: Chistopher James Newton Fryer, Richard Guy Blakesley
  • Publication number: 20090067198
    Abstract: A system includes a first device configured to receive a first wireless power associated with a first electromagnetic wave from a wireless power source. The first device is configured to convert the first wireless power to a first DC power, store the first DC power, and convert the first DC power stored in the first device to a second wireless power associated with a second electromagnetic wave. The system includes a second device configured to receive the second wireless power from the first device. The second device is configured to convert the second wireless power to a second DC power. The first device can receive the first wireless power at a first location and can convert the first DC power stored in the first device to the second wireless power at a second location different from the first location.
    Type: Application
    Filed: August 28, 2008
    Publication date: March 12, 2009
    Inventors: David Jeffrey Graham, Jesse Frederick Goellner, Michael Thomas McElhinny, Alexander Brailovsky
  • Patent number: 7483282
    Abstract: A method of using a cycloconverter switches a first switch of the first topology type to an on state after a magnitude of a current through an output inductor becomes less than a predetermined current threshold, and switches a second switch of the first topology type to an off state a first time after switching the first switch to the on state. The cycloconverter includes nodes on a first port, nodes on a second port, a switch pair coupled between a first node of the first port and a first node of the second port, a switch pair coupled between a second node of the first port and a first node of the second port, a switch pair coupled between a first node of the first port and a second node of the second port, and a switch pair coupled between a second node of the first port and a second node of the second port. Each switch pair includes a switch of each topology type.
    Type: Grant
    Filed: August 29, 2006
    Date of Patent: January 27, 2009
    Assignee: GM Global Technology Operations, Inc.
    Inventors: Lateef A. Kajouke, Silva Hiti
  • Patent number: 7027311
    Abstract: An apparatus for a wireless power supply including a mechanism for receiving a range of RF radiation across a collection of frequencies. The apparatus includes a mechanism for converting the RF radiation across the collection of frequencies, preferably at a same time into DC. A method for a wireless power supply including the steps of receiving a range of RF radiation across a collection of frequencies. There is the step of converting the RF radiation across the collection of frequencies, preferably at a same time into DC.
    Type: Grant
    Filed: October 15, 2004
    Date of Patent: April 11, 2006
    Assignee: FireFly Power Technologies, Inc.
    Inventors: Timm A. Vanderelli, John G. Shearer, John R. Shearer
  • Publication number: 20040042235
    Abstract: According to the present invention, an optical communication system is provided, in which a high reliability, a high quality and a low cost transmission are realized. The signal light reached to the optical receiver is detected and converted to an electrical signal by the optical-to-electrical converter. The electrical signal is inputted to the filter that has a convex characteristic with a peak frequency between 2 GHz to 4 GHz, which compensates the frequency characteristic of the signal light. Namely, a concave characteristic of the signal light with a bottom frequency between 2 GHz and 4 GHz due to the accumulated dispersion of the optical transmission path can be compensated.
    Type: Application
    Filed: June 26, 2003
    Publication date: March 4, 2004
    Inventor: Takashi Fukuoka
  • Patent number: 6343021
    Abstract: An electronic method and apparatus are described for an isolated, universal input, power supply in the form of a single-ended resonant converter that utilizes capacitive energy storage versus magnetic energy storage, for converting an ac or DC input voltage to a variable voltage and current DC output or a variable ac output voltage, current, frequency, or phase. The preferred topology is a direct ac to ac, single-ended resonant converter using a single switch (4) and integrated magnetic element (1) with inherent near-unity power factor. Advantages of this method include a significant reduction in global energy consumption, simpler circuitry, substantially lower cost, higher efficiency, and longer operational life.
    Type: Grant
    Filed: May 9, 2000
    Date of Patent: January 29, 2002
    Inventor: Floyd L. Williamson
  • Patent number: 6018466
    Abstract: An electronic signal conditioner (ESC) (10) that can be designed to operate a differential capacitive load (90) or a single-ended capacitive load (92). The ESC (10) is disclosed in four design configurations. In the first design, the ESC (10) employs a pair of high-frequency transformers (34,48) each having a single-ended primary winding (36,50) that is connected through a secondary winding (42,56) to a rectifying circuit (70,80) that operates a differential capacitive load (90). The second design also employs a pair of transformers (32,34) that have push-pull primary windings (36,50) which similarly operate a differential capacitive load (90). The third design employs a single transformer (34) having a single-ended primary winding (36) which similarly operates a single-ended capacitive load (92). The fourth design also uses a single transformer (32) having a push-pull primary winding (36) which operates a single-ended capacitive load (92).
    Type: Grant
    Filed: August 4, 1997
    Date of Patent: January 25, 2000
    Inventor: Maria Lucian
  • Patent number: 5969966
    Abstract: A power converting apparatus and a power converting method for driving a high voltage AC motor at a variable speed. Conventional invertor systems cannot solve technical subjects such as energy conservation, resource conservation, miniaturization, efficiency promotion and voltage and current waveform distortion suppression for improvement in environment needed by the market, and cannot solve another technical subject of improvement in redundancy such that, upon failure, operation is performed with a normal part.
    Type: Grant
    Filed: March 9, 1998
    Date of Patent: October 19, 1999
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Toshihiro Sawa, Tsuneo Kume, Koichi Hirano
  • Patent number: 5929586
    Abstract: A vehicular motor driving apparatus includes a control unit 15 for drive-controlling a motor by PWM-drive-controlling a motor driving circuit based on a motor starting signal. The control unit has a drive controller for setting a drive frequency of a PWM-drive control signal to be an integral multiple of or (integer+0.5) times a channel frequency interval of channel frequencies allotted for AM radio broadcasts. As a result, radiation noise associated with harmonics of the PWM-drive control signal, when coincided with the channel frequencies used by AM radio broadcast stations, is removed along with the channel frequencies through radio receiver detection. When the radiation noise does not coincide with the in-use channel frequencies, it is offset by the channel frequency interval therefrom, thereby preventing its reception.
    Type: Grant
    Filed: July 28, 1998
    Date of Patent: July 27, 1999
    Assignee: Honda Giken Kogyo Kabushika Kaisha
    Inventors: Yoshiki Noro, Yoshinobu Mukai, Masaaki Kawano
  • Patent number: 5771471
    Abstract: An electronic device, such as a radiotelephone, is connectable to a variable-level power source. The electronic device includes a rechargeable power source which is repowered responsive to application of operative power generated by the variable-level power source. The electronic device provides a constant charge current regulator for converting operative power of a constant voltage into operative power of a constant current to be applied to the rechargeable power source to recharge the rechargeable power source. The constant charge current regulator is made up of a series connected diode and resistor pair. According to a further aspect of the invention, when the rechargeable power source becomes fully recharged, application of the operative power can be reduced.
    Type: Grant
    Filed: June 13, 1997
    Date of Patent: June 23, 1998
    Assignee: Motorola, Inc.
    Inventors: William P. Alberth, Jr., James Kamke, David Mark DeMuro
  • Patent number: 5737196
    Abstract: The present invention is an electrical power generating system and method of operation. An inverter (18) is responsive to a DC potential for producing a fundamental frequency alternating current output such as 400 Hz. three-phase AC including harmonics. A first harmonic suppression filter (22), coupled to the alternating current output, produces an output having reduced harmonics compared to the harmonics in the input of the inverter. An isolation transformer (61) has a primary coupled to an output (24) of the first harmonic filter, a first secondary for outputting the alternating current at the fundamental frequency, and a second secondary for also outputting the alternating current at the fundamental frequency. A first rectifier (65) is coupled to the output (63) of the first secondary and produces direct current including harmonics produced by the rectification.
    Type: Grant
    Filed: August 12, 1996
    Date of Patent: April 7, 1998
    Assignee: Sundstrand Corporation
    Inventors: Daniel L. Hughes, Thomas S. Latos
  • Patent number: 5663878
    Abstract: An apparatus and method for generating a low frequency AC signal such as a ringing voltage signal for a telephone subscriber interface unit or the like. The apparatus comprises an oscillator which drives a pair of counters whose outputs differ by a desired low frequency. The output of the first counter is fed to a controlled current source so as to excite a resonant tank circuit and thereby provide a high voltage sinusoidal signal. The output of the second counter drives a switch which samples the high voltage sinusoidal signal. An alias frequency is thus generated which is filtered by an output capacitor. The method comprises steps which follow directly from the above-described apparatus.
    Type: Grant
    Filed: March 21, 1996
    Date of Patent: September 2, 1997
    Assignee: Unitrode Corporation
    Inventor: Jimmy Aubrey Walker
  • Patent number: 5652699
    Abstract: A stable DC power system of high-voltage and good-output performance is provided by adding a 3-phase inverter, whereby modified waveform for an output control is produced and a filter to a conventional DC power system and by bridge-rectifying. The modified sinusoidal wave such as a varied wave whose upper portion ranging from 30.degree. to 150.degree. is flat of a 1/2 cycle of the sinusoidal wave, a modified wave whose portions ranging from 30.degree. to 90.degree. and from 90.degree. to 150.degree. are linear in a 1/2 cycle of the sinusoidal wave and a modified wave whose portions ranging from 30.degree. to 90.degree. and from 210.degree. to 270.degree. are recessed so as to be symmetrical with respect to a line in the whole cycle of the sinusoidal wave are used for reducing ripples of the output voltage after the 3-phase rectification.
    Type: Grant
    Filed: August 11, 1995
    Date of Patent: July 29, 1997
    Assignees: Korea Atomic Energy Research Institute, Korea Electric Power Corporation
    Inventors: Jung-Moog Kim, Seung-Kyu Pak, Euo-Chang Jung, Cheol-Jung Kim, Jong-Min Lee
  • Patent number: 5640311
    Abstract: A power supply is disclosed which is compatible with modern thin film technology which has an overall size compatible with modern miniaturized electronic components. Input power having an oscillating component in the 50/60 Hz 120/220 volt range is immediately switched to high frequency current exceeding 100 KHz and preferably switched with a frequency in the megahertz range. The switched current, otherwise unaltered from its current having an oscillating component, is then transduced in voltage at a thin film transformer, passed through thin film mounted electronic components for rectification and filtering. A regulator circuit modifies the semi-conductor switch duty cycle to control the rectifier output voltage. All transformer, rectifier, and filter components are of thin film variety and mounted to attain efficient heat dissipation together with size reduction comparable to the powered components driven by the power supply.
    Type: Grant
    Filed: August 23, 1995
    Date of Patent: June 17, 1997
    Inventor: Ronald F. Soohoo
  • Patent number: 5621624
    Abstract: A power supply is disclosed which is compatible with modern thin film technology which has an overall size compatible with modern miniaturized electronic components. Input power having an oscillating component in the 50/60 Hz 120/220 volt range is immediately switched to high frequency current exceeding 100 KHz and preferably switched with a frequency in the megahertz range. The switched current, otherwise unaltered from its current having an oscillating component, is then transduced in voltage at a thin film transformer, passed through thin film mounted electronic components for rectification and filtering. A regulator circuit modifies the semi-conductor switch duty cycle to control the rectifier output voltage. All transformer, rectifier, and filter components are of thin film variety and mounted to attain efficient heat dissipation together with size reduction comparable to the powered components driven by the power supply.
    Type: Grant
    Filed: August 30, 1994
    Date of Patent: April 15, 1997
    Inventor: Ronald F. Soohoo
  • Patent number: 5590031
    Abstract: A system is disclosed for converting high frequency zero point electromagnetic radiation energy to electrical energy. The system includes a pair of dielectric structures which are positioned proximal to each other and which receive incident zero point electromagnetic radiation. The volumetric sizes of the structures are selected so that they resonate at a frequency of the incident radiation. The volumetric sizes of the structures are also slightly different so that the secondary radiation emitted therefrom at resonance interfere with each other producing a beat frequency radiation which is at a much lower frequency than that of the incident radiation and which is amenable to conversion to electrical energy. An antenna receives the beat frequency radiation. The beat frequency radiation from the antenna is transmitted to a converter via a conductor or waveguide and converted to electrical energy having a desired voltage and waveform.
    Type: Grant
    Filed: July 27, 1994
    Date of Patent: December 31, 1996
    Inventors: Franklin B. Mead, Jr., Jack Nachamkin
  • Patent number: 5473530
    Abstract: A pulse width modulated DC/AC converter includes an input circuit galvanically insulated from an output circuit. The input circuit includes two branches connected in parallel to a pair of input terminals which receive a direct current voltage. Each branch includes an inductor, and a bidirectional switching element which may include a transistor in parallel with a diode. The output circuit has a similar configuration with the addition of two filtering capacitors connected across the output terminals. The converter has a wide range of applications, such as a ringing generator in a telephone system, an emergency supply for a computer system, or as a driving stage for a AC motor.
    Type: Grant
    Filed: June 14, 1993
    Date of Patent: December 5, 1995
    Assignee: Italtel Societa Italiana Telecomunicazione S.p.A.
    Inventors: Cimador Giuseppe, Prestifilippo Paolo
  • Patent number: 5363286
    Abstract: A high voltage generator comprises a transformer unit for boosting an inputted AC voltage and a rectifier unit for rectifying the AC voltage boosted by the transformer unit, the transformer unit and the rectifier unit being assembled as high voltage components, wherein the high voltage components are molded by a solid insulation material with the high voltage components being separated from each other by a predetermined distance to thereby form the high voltage components to a single block member. An electric conductive layer is formed on an outside surface of the block member. The high voltage generator is utilized for an X-ray generator and a DC high voltage output generated from the rectifier unit serves as a power supply for generating X-rays. A filament heating transformer is further disposed as a high voltage component for supplying an AC power for heating filaments of the X-ray tube.
    Type: Grant
    Filed: December 23, 1992
    Date of Patent: November 8, 1994
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Akira Tsuchiya
  • Patent number: 5321596
    Abstract: A DC to DC switch mode power supply for a service subscriber interface unit of a fiber optic network includes a source of DC primary power, a main DC to DC switched mode power supply connected to the source of DC primary power and including switching circuitry and rectifier circuitry for supplying DC operating power to the service subscriber interface unit including central office battery power to at least one subscriber loop connected thereto, and a ringing voltage DC to AC switched mode generator connected to the source of DC primary power and including switching circuitry and synchronous rectification circuitry for generating ringing ringing voltage approximating a sine wave supplied as a reference to the synchronous rectification circuitry. A Johnson counter and resistor capacitor network is preferably employed to convert a reference ringing square wave into a sine wave.
    Type: Grant
    Filed: May 17, 1993
    Date of Patent: June 14, 1994
    Assignee: Raynet Corporation
    Inventor: David E. Hurst
  • Patent number: 5285365
    Abstract: A three-phase a.c. uninterruptible power supply includes a transformer providing isolation between an input and an output, a single-phase inverter, and a cycloconverter. The uninterruptible power supply operates to convert a d.c. voltage into a high-frequency a.c. voltage in the single-phase inverter, transmit the output voltage of the single-phase inverter in an isolated state, and convert the output of the transformer into a three-phase voltage having a lower frequency, such as 50 or 60 Hz, than the frequency of the output voltage of the single-phase inverter. This enables the transformer providing isolation to operate at a high frequency, thereby enabling the size of the transformer to be reduced.
    Type: Grant
    Filed: November 26, 1991
    Date of Patent: February 8, 1994
    Assignee: Hitachi, Ltd.
    Inventors: Ikuo Yamato, Norikazu Tokunaga
  • Patent number: 5274538
    Abstract: A power conversion apparatus comprises an inverter circuit for converting DC power into AC power which has a first frequency; a transformer connected to the inverter circuit. A cyclo converter circuit having a bidirectional switch controls a direction in which an electric current passes and converts the output from the transformer into AC power which has a second frequency. A switching signal generating circuit generates a switching signal for controlling the polarity of the bidirectional switch of the cyclo converter circuit in such a manner that the output voltage from the inverter circuit does not encounter a short circuit.
    Type: Grant
    Filed: October 15, 1991
    Date of Patent: December 28, 1993
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Nobuo Sashida, Kazunori Sanada
  • Patent number: 5272612
    Abstract: An output voltage of an A.C. power source is input to an frequency converter and the frequency thereof is increased. A plurality of high voltage transformers of small capacity each of which has a secondary winding of a small number of turns and which are connected in parallel with one another are connected to an output terminal of the frequency converter. Outputs of the high voltage transformers are respectively connected to high voltage rectifier circuits. Outputs of the high voltage rectifier circuits are serially coupled, the output voltages thereof are added together, and the addition result is applied to an X-ray tube. Combinations of the high voltage transformers and the high voltage rectifier circuits are molded into units one or a preset number at a time with solid insulating material including gel insulating material.
    Type: Grant
    Filed: December 19, 1991
    Date of Patent: December 21, 1993
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Toyoshige Harada, Kenichi Tanbo
  • Patent number: 5270914
    Abstract: An apparatus and method is disclosed for an improved control system for a series resonant converter for transferring power between a source and a load. The control system comprises a series resonant circuit including a capacitor and an inductor with a first and second switching matrix connecting the series resonant circuit to the source and the load, respectively. A controller selects a combination of switches for transferring power between the source and the load using a single segment half-cycle resonant waveform that produces a final voltage on the capacitor within a preselected boundary.
    Type: Grant
    Filed: February 23, 1993
    Date of Patent: December 14, 1993
    Inventors: Hian K. Lauw, J. Ben Klaassens
  • Patent number: 5159539
    Abstract: A DC-to-AC electric power converting apparatus includes: an inverter circuit for converting DC electric power into AC electric power; a transformer connected to the inverter circuit; a cyclo-converter circuit for converting the frequency of the output from the transformer; a carrier signal generator for generating a carrier signal of a predetermined frequency; an inverter switching circuit for generating a signal for controlling the inverter circuit in synchronization with the carrier signal; a reference voltage signal generating circuit for generating a reference signal for the AC voltage to be transmitted from the cyclo-converter circuit; a first switching signal generating circuit for generating a switching signal in accordance with the reference voltage signal supplied from the reference voltage signal generating circuit and the carrier signal supplied from the carrier signal generator; and a cyclo-converter switching circuit for generating a signal for controlling the cyclo-converter circuit in accordanc
    Type: Grant
    Filed: April 20, 1992
    Date of Patent: October 27, 1992
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Masato Koyama
  • Patent number: 5053936
    Abstract: A frequency/voltage converting device includes a frequency/voltage converting means for converting a DC voltage corresponding to the frequency of an input signal, a reverse-polarity ripple voltage outputting device for outputting a ripple voltage which is equal in magnitude and reverse in polarity to a ripple voltage contained in the DC voltage output from the frequency/voltage converting means; and an adding device for adding the DC voltage output from the frequency/voltage converting device and the voltage output from the reverse-polarity ripple voltage outputting device. The above arrangement serves to cancel the ripple voltage, thereby obtaining a DC voltage containing no ripple voltage for a sawtooth wave generating device.
    Type: Grant
    Filed: June 15, 1990
    Date of Patent: October 1, 1991
    Assignee: Pioneer Electronic Corporation
    Inventors: Jun Honda, Hiroyuki Kubozoe
  • Patent number: 5010471
    Abstract: An apparatus and method is disclosed for an improved AC--AC series-resonant converters incorporating power pulse modulation with internal frequencies of tens of kHz is applied to a series-resonant converter system for generating synthesized multiphase bipolar waveforms with reversible power flow and low distortion. The high pulse frequency allows the application of the principle of modulation and demodulation for fast system response. Switches are required which have bidirectional current conduction and voltage blocking ability. The conventional series-resonant AC--AC converter applies a total of 24 anti-parallel thyristors. The circuit configuration of the present invention is a series-resonant AC--AC converter with only 12 thyristors. Use of the converter results in a higher efficiency and lower costs.
    Type: Grant
    Filed: June 26, 1989
    Date of Patent: April 23, 1991
    Assignee: Robert F. Frijouf
    Inventors: J. Ben Klaassens, Hian K. Lauw, Freddy de Beer
  • Patent number: 4969080
    Abstract: A method of operating a three-phase converter to produce a signal at an output frequency by decoupling and digitally sampling inverter input signals and load voltage signals and feeding the resultant phase signals back into the inverter. The phase voltages activate switching elements in the inverter to switch signals a plurality of times within one cycle of the output frequency thus changing electrical power at a first frequency, including direct current, to A.C. power at the output frequency.
    Type: Grant
    Filed: July 12, 1989
    Date of Patent: November 6, 1990
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Takao Kawabata, Takeshi Miyashita, Yushin Yamamoto, Hidehiko Sugimoto
  • Patent number: 4931919
    Abstract: A system for converting variable frequency multiple phase current into multiple phase current of constant frequency with a neutral having a multiple phase inverter with a neutral (N) is disclosed. A first input (34) is connected to the multiple phase inverter for receiving pulses of a positive polarity. A second input (36) is connected to the multiple phase inverter for receiving pulses of a negative polarity. A variable frequency multiple phase source (12, 14 and 16) of alternating current applies current to a multiple phase transformer (80, 142 and 180). Current from the transformer is applied to a full-wave rectifier (96) which has a first group of diodes (112) which applies the positive pulses to the input (34). A second group of diodes (116) applies the negative pulses to the input (36). The ripple frequency f.sub.
    Type: Grant
    Filed: July 14, 1988
    Date of Patent: June 5, 1990
    Assignee: Sundstrand Corp.
    Inventors: Vietson M. Nguyen, John J. Dhyanchand
  • Patent number: 4914373
    Abstract: The generator set comprises an internal combustion engine (5) driving a three-phase generator (6). The latter is surmounted by a casing (7) containing a converter (8) which is supplied with power by the generator (6) and provides a current of 42 V at 200 Hz at the socket (11).
    Type: Grant
    Filed: September 22, 1987
    Date of Patent: April 3, 1990
    Inventor: Jacques Rivkine
  • Patent number: 4878163
    Abstract: In a power conversion system, a DC voltage of a DC power supply is converted into a predetermined high-frequency voltage by an inverter, and a high-frequency low voltage generated from the inverter is converted into a high-frequency high voltage by a transformer. A high-frequency high voltage generated from a secondary winding of the transformer is converted into a predetermined low-frequency voltage by a frequency changing circuit. The commutating operation of the frequency changing circuit is performed by a control circuit in response to the output current of the frequency changing circuit and in synchronism with the starting time of the short-circuiting prevention period of the inverter. As a result, the converted output of the power conversion system is prevented from decreasing.
    Type: Grant
    Filed: June 3, 1988
    Date of Patent: October 31, 1989
    Assignee: Hitachi, Ltd.
    Inventors: Ikuo Yamato, Norikazu Tokunaga, Yasuo Matsuda, Hisao Amano
  • Patent number: 4868462
    Abstract: A high voltage transformer assembly for use in a high frequency medical X-ray generator comprises a plurality of transformers, a plurality of filter capacitors, and a pair of capacitor printed circuit boards for mounting the capacitors and for coupling the capacitors in electrical circuit to define a plurality of relatively high power handling capacitance circuits. A plurality of diodes are provided, and diode printed circuit boards mount the diodes and couple the diodes in electrical circuit to define a plurality of relatively high power handling diode circuit elements. A frame, and top and bottom plate-like members, and other joining structure join together the frame and the top and bottom plate-like members, and the capacitor printed circuit boards to form an enclosure wherein the top and bottom plate-like members and the capacitor printed circuit boards comprise four sides of a generally rectilinear, six-sided enclosure.
    Type: Grant
    Filed: January 27, 1988
    Date of Patent: September 19, 1989
    Assignee: Gendex Corporation
    Inventor: Robert A. Chattin
  • Patent number: 4866585
    Abstract: A highly innovative new technique of developing AC to DC power sources for various applications has been described. Such technique of generating DC power is different from the conventional linear and switching power conversion techniques and this new technology has been called the Solid State Power Supply (SSPS) Technology. The principle of operation depends upon high-frequency pulsed power switching followed by high energy charge-discharge principles as applied to power conversion technology. The use of fast turn-on power MOSFETs enables the application of high frequency switching on this power technology. While the non-isolated SSPS is claimed to be transformerless, the isolated SSPS requires the use of a transformer for input-output isolation. The input and output filtering is reduced tremendously, thereby reducing the size of such power supplies.
    Type: Grant
    Filed: June 8, 1988
    Date of Patent: September 12, 1989
    Inventor: Pawan K. Das
  • Patent number: 4855887
    Abstract: A power conversion apparatus comprises an inverter for converting a voltage of a DC power source into AC power having a frequency higher than the commercial frequency, a transformer, fed by the inverter, for outputting AC power, which is adjusted at a desired voltage, a frequency converter, formed by two pairs of two gate turn-off thyristors (GTOs) connected in reverse-parallel, for converting the frequency of the AC power supplied from the transformer into the commercial frequency, and an energy regenerating device having capacitors for absorbing the energy of a spike voltage occurring due to a circuit inductance upon interruption of a current of each GTO of the frequency converter and a bridge circuit, formed by GTOs and diodes connected in reverse-paralel therewith, for switching over the direction of connecting the capacitors with a secondary winding of the transformer in accordance with the polarity of a voltage of the secondary winding in such a manner that the energy stored in the capacitors is regener
    Type: Grant
    Filed: September 22, 1988
    Date of Patent: August 8, 1989
    Assignee: Hitachi, Ltd.
    Inventors: Ikuo Yamato, Norikazu Tokunaga, Yasuo Matsuda, Hisao Amano
  • Patent number: 4846579
    Abstract: A quick-response frequency-voltage converting circuit which generates a voltage signal responding to a reciprocal of the period of an input signal, and sample-holds this voltage signal at the end of one period, and thereby can obtain a voltage responding to the frequency of the input signal in one period.
    Type: Grant
    Filed: September 7, 1988
    Date of Patent: July 11, 1989
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Noriyuki Tomimatsu, Akihiko Tsurishima