For Full Wave Rectifier With At Least 1 Three Electrode Device Patents (Class 363/88)
  • Patent number: 8922148
    Abstract: A motor includes a rotor, a sensor unit, an offset unit, a rectification unit and a modulating unit. The sensor unit outputs a first signal in accordance with a magnetic field variation of the rotor. The offset unit is coupled to the sensor unit, and outputs a second signal in accordance with the first signal. The rectification unit is coupled to the offset unit, and outputs a third signal in accordance with the second signal. The modulating unit is coupled to the rectification unit, and outputs a control signal in accordance with a result by comparing the third signal with a periodic signal. The modulating unit controls a reverse rotation of the rotor smoothly in accordance with the control signal. A control method of the motor is also disclosed.
    Type: Grant
    Filed: December 7, 2012
    Date of Patent: December 30, 2014
    Assignee: Delta Electronics, Inc.
    Inventors: Yu-Liang Lin, Kun-Fu Chuang, Cheng-Chieh Liu
  • Publication number: 20140285089
    Abstract: According to one embodiment, a power supply circuit includes: a DC-DC converter which converts a first DC voltage supplied from a power supply flow path into a second DC voltage having a different absolute value, to supply the voltage to a DC load; and an overcurrent protection unit which is electrically connected to an end portion of the DC load on a low potential side, and performs feedback control of the DC-DC converter based on current which flows to the DC load. The DC-DC converter includes a normally-on type switching element. The overcurrent protection unit is electrically connected to the third electrode. When the current which flows to the DC load is greater than a reference value, the overcurrent protection unit changes the state of the switching element from the first state to the second state by decreasing the potential of the third electrode.
    Type: Application
    Filed: September 3, 2013
    Publication date: September 25, 2014
    Applicant: Toshiba Lighting & Technology Corporation
    Inventors: Hiroshi Akahoshi, Noriyuki Kitamura, Hirokazu Otake, Yuji Takahashi
  • Publication number: 20140265913
    Abstract: An electrical load driving apparatus comprising a thyristor circuit arranged to control a transmission of electric power to an electrical load, wherein the thyristor circuit is connected to a conversion module arranged to convert a characteristic of the thyristor circuit to operate with a load characteristic of the electrical load.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 18, 2014
    Applicants: e.Energy Double Tree Limited, City University of Hong Kong
    Inventors: City University of Hong Kong, e.Energy Double Tree Limited
  • Patent number: 8736113
    Abstract: A method and system for limiting energy to a sensor and/or an environment in which the sensor is located. A high current sensor driver is powered through a resistance-capacitance (RC) circuit. In a failure mode, the RC circuit constrains output of a sensor driver to the sensor in order to limit average current applied to the sensor. In one embodiment, the capacitor is chosen so that it can provide adequate current to the sensor driver for a short period of time. The value of the resistor may be chosen to ensure that under short circuit conditions direct current (DC) is limited to a safe value. The combined values of the resistor and capacitor may be adjusted such that the capacitor can charge to a prescribed level during the interval between active pulses.
    Type: Grant
    Filed: January 19, 2011
    Date of Patent: May 27, 2014
    Assignee: Parker Hannifin Corporation
    Inventors: Howard Austerlitz, Ron Bueter, John O'Brien
  • Patent number: 8730697
    Abstract: A rectifier is provided. The rectifier includes a first rectification unit having an anode connecting to a negative radio frequency (RF) port and a cathode connecting to a positive direct current (DC) port, a second rectification unit having an anode connecting to a positive RF port and a cathode connecting to the positive DC port, a third rectification unit having an anode connecting to a ground and a cathode connecting to the negative RF port, and a fourth rectification unit having an anode connecting to the ground and a cathode connecting to the positive RF port. The first rectification unit includes a plurality of first diodes that are connected in parallel, and the second rectification unit includes a plurality of second diodes that are connected in parallel.
    Type: Grant
    Filed: May 16, 2012
    Date of Patent: May 20, 2014
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Dong Zo Kim, Sang Wook Kwon, Yun Kwon Park, Eun Seok Park, Young Tack Hong, Ki Young Kim, Young Ho Ryu, Nam Yun Kim, Jin Sung Choi, Chang Wook Yoon
  • Patent number: 8488351
    Abstract: An exemplary non-isolated DC-DC converter for a solar power plant, can be adapted to connect to a full-bridge inverter. The converter includes positive and negative input terminals, and positive and negative output terminals. A plurality of switches, diodes, inductors and capacitors are connected in a circuit configuration to the input and output terminals. A control means is connected to the circuit for controlling the switching of a first, second, and third switch between an open and closed state.
    Type: Grant
    Filed: March 17, 2011
    Date of Patent: July 16, 2013
    Assignee: ABB Research Ltd.
    Inventors: Leonardo-Augusto Serpa, Francisco Canales, Ngai-Man Ho, Antonio Coccia
  • Patent number: 8369116
    Abstract: New utility of an existing class of DC galvanically isolated current sourcing circuit topologies for power conversion simultaneously allows improvement in its secondary circuit(s) to power conversion efficiency and reduction in working voltage magnitudes, or simply reduction in working voltage magnitudes, with resulting benefits for reduction in manufacturing cost, reduction in size and weight, and increase in market acceptance, or may simply allow secondary circuit(s) to enable easier provisioning of safety, improvement in reliability, or improvement in efficiency. The magnitude of DC output voltage is optimized at higher value for greater efficiency, while simultaneously optimizing the secondary circuit's working voltage maximum magnitude at a lower value for greater safety. The method requires full cycle current-compliant input impedance of the secondary power source whereby the secondary of the DC galvanically isolating device behaves in a mode of being a full cycle voltage-compliant current source.
    Type: Grant
    Filed: March 1, 2010
    Date of Patent: February 5, 2013
    Inventor: Raymond Peter Maroon
  • Patent number: 8223508
    Abstract: A power supply to provide electrical power to one or more loads. The power supply may include a resonant air core transformer to provide an adjustable and adaptable source of power to electronic devices. The power supply may include isolated primary-side circuitry and secondary-side circuitry. The primary-side circuitry may include control circuitry that, among other things, provides drive waveforms for the primary-side switching circuitry. In embodiments configured to produce AC output, the secondary-side circuitry may also include switching circuitry. The primary-side control circuitry may provide drive waveforms for the secondary-side switching circuitry. The secondary-side circuitry may include measurement circuitry that measures the current and/or voltage of the output and provides those measurements to the control circuitry through isolation circuitry. The control circuitry may adjust the drive waveforms for the primary-side and/or secondary-side switching circuitry as a function of the measured values.
    Type: Grant
    Filed: March 20, 2008
    Date of Patent: July 17, 2012
    Assignee: Access Business Group International LLC
    Inventors: David W. Baarman, Joshua K. Schwannecke, Joshua B. Taylor, John James Lord, Wesley J. Bachman
  • Patent number: 8149604
    Abstract: A circuit for controlling a thyristor (V1) into conducting state, the thyristor (V1) being in a rectifier, which rectifier is adapted to supply DC voltage to a DC voltage circuit. The circuit comprises a pulse transformer (T1), means for generating voltage pulses on the primary winding of the pulse transformer (T1), a trigger capacitor (C2) adapted to be charged from the voltage pulses in the secondary winding of the pulse transformer, a zener diode (V5) adapted to be triggered with the voltage of the trigger capacitor (C2) when the voltage of the trigger capacitor (C2) exceeds the breakdown voltage of the zener diode (V5), and an auxiliary thyristor (V3) adapted to be triggered with the current from the trigger capacitor (C2) flowing via the zener diode (V5), wherein the cathode of the auxiliary thyristor (V3) is connected to the gate of the thyristor (V1) for triggering the thyristor (V1) with the current from the trigger capacitor (C2) flowing via the auxiliary thyristor (V3).
    Type: Grant
    Filed: July 1, 2009
    Date of Patent: April 3, 2012
    Assignee: ABB OY
    Inventor: Matti Laitinen
  • Patent number: 7848127
    Abstract: First and second rectification circuits are connected to a commercial AC power supply by a reactor. A load is connected between the output terminal on the positive side of the first rectification circuit and the output terminal on the negative side of the second rectification circuit. While the voltage or the commercial AC power supply remains at the positive level, a current flows through a path constituted by one of the diodes of the first rectification circuit and one of the diodes of the second rectification circuit. While the voltage of the commercial AC power supply remains at the negative level, too, a current flows through the path constituted by one of the diodes of the first rectification circuit and one of the diodes of the second rectification circuit.
    Type: Grant
    Filed: August 26, 2009
    Date of Patent: December 7, 2010
    Assignee: Toshiba Carrier Corporation
    Inventor: Hirofumi Horino
  • Patent number: 7791914
    Abstract: A system for converting alternating electrical current to direct electrical current may include an input supply for supplying alternating electrical current. The input supply may be connected to a rectifier. The rectifier may be configured as a body diode. A comparator may be coupled to the rectifier. The comparator may apply a voltage to the rectifier when the input supply is operating.
    Type: Grant
    Filed: October 1, 2007
    Date of Patent: September 7, 2010
    Assignee: Network Appliance, Inc.
    Inventors: Roshan Thakur, Zoltan Zansky
  • Publication number: 20090147555
    Abstract: An exemplary embodiment includes a system for measuring and controlling a thyristor comprising a thyristor, a Rowgoski coil in operable communication therewith the thyristor, and a processor operative to receive signals from the Rowgoski coil, determine a direct current value of the thyristor, and control the thyristor.
    Type: Application
    Filed: December 5, 2007
    Publication date: June 11, 2009
    Inventor: William Robert Pearson
  • Patent number: 7535124
    Abstract: The voltage stabilizer for stabilizing a voltage of a circuit includes a first resistor, a second resistor, a voltage controller, and a current supply unit. The voltage controller keeps a voltage of the first resistor constant. The current supply unit supplies a first current to between the first resistor and the second resistor when a second current in the circuit becomes equal to or larger than a predetermined value.
    Type: Grant
    Filed: April 25, 2005
    Date of Patent: May 19, 2009
    Assignee: Fujitsu Limited
    Inventor: Takahiro Miyazaki
  • Patent number: 7518895
    Abstract: In one embodiment, a power converter system includes a first input terminal and a second input terminal operable to connect to an alternating current (AC) power source, and an output terminal at which an output voltage can be provided to a load. A first inductor and a first diode are connected in series between the first input terminal and the output terminal. A second inductor and a second diode are connected in series between the second input terminal and the output terminal. A first switch is connected to the first inductor and the first diode, and a second switch is connected to the second inductor and the second diode. The first switch and the second switch alternately function as a boost switch and a synchronous rectifier for charging and discharging the first and second inductors during operation of the power converter system.
    Type: Grant
    Filed: June 30, 2006
    Date of Patent: April 14, 2009
    Assignee: Fairchild Semiconductor Corporation
    Inventors: Sampat Shekhawat, Ronald H. Randall, Donghye Cho
  • Patent number: 7495940
    Abstract: A device that includes an active rectifier (14) having control gates controllable to produce an output voltage on a DC bus (20), a gate control circuit (16) for producing gate control signals for controlling the active rectifier control gates, a first circuit (18) connected to the gate control circuit (16) and producing a command current magnitude signal and a power factor signal for use by the gate control circuit (16), a current line (30) providing a current related to the DC load current to the first circuit (16), and a voltage line (32) providing a voltage related to the DC bus voltage to the first circuit (16), the first circuit (16) including a peak detector (64) detecting current peaks on the DC bus (20), a command current magnitude signal generator (34) commanding a current as a function of the detected peaks, and a power factor controller (33, 40) varying the power factor signal (42) to control the voltage on the DC bus (20).
    Type: Grant
    Filed: August 19, 2005
    Date of Patent: February 24, 2009
    Assignee: Honeywell International Inc.
    Inventor: Louis Cheng
  • Publication number: 20080253157
    Abstract: A power control method using AC power, the method being capable of performing: low power control that passes only two portions of positive direction waves of each one-cycle sine wave of the AC power and only two portions of negative direction waves of each one-cycle sine wave of the AC power, which have voltage levels lower than a set reference voltage level, through a system; and high power control that does not pass only two portions of positive direction waves of each one-cycle sine wave of the AC power and only two portions of negative direction waves of each one-cycle sine wave of the AC power, which have voltage levels lower than a set reference voltage level, through the system.
    Type: Application
    Filed: June 10, 2005
    Publication date: October 16, 2008
    Inventor: Young-Chang Cho
  • Patent number: 7173834
    Abstract: A half-controlled silicon control rectifying system and method thereof are provided. In this case, the first detection unit detects the zero cross phase of the triphase AC in input port thereof. The second detection unit detects the voltage of the DC bus. Then the control unit controls the silicon-controlled rectifying unit by software. Therefore, the efficiency of soft actuation is achieved.
    Type: Grant
    Filed: April 11, 2005
    Date of Patent: February 6, 2007
    Assignee: Delta Electronics, Inc.
    Inventors: Chui-Min Tai, Cheng-Te Chen
  • Patent number: 6934169
    Abstract: A method of controlling a half-controlled rectifier, and a rectifier structure, which comprises an n-phased half-controlled converter bridge, a DC intermediate circuit and a capacitor of the DC intermediate circuit. The converter structure further comprises an auxiliary intermediate circuit and a non-controlled n-phased diode rectifier bridge which feeds the auxiliary intermediate circuit and is connected to the DC intermediate circuit by isolating diodes.
    Type: Grant
    Filed: December 21, 2004
    Date of Patent: August 23, 2005
    Assignee: ABB Oy
    Inventor: Erkki Miettinen
  • Patent number: 6577072
    Abstract: An LED lamp device of the invention includes a power supply unit (102, 103) supplied with an alternating-current power supply voltage, and an LED lamp (106) constituted by one or a plurality of serially connected LEDs connected to output terminals of the power supply unit (102, 103). The power supply unit (102) obtains a rectified wave of the alternating-current power supply voltage, admits electric power for only part of a time period in which the voltage of the rectified wave corresponding to each half period of the wave of the alternating-current power supply voltage is higher than or equal to a predetermined value, and uses the electric power as power for lighting the LED lamp (106).
    Type: Grant
    Filed: July 10, 2001
    Date of Patent: June 10, 2003
    Assignee: Takion Co., Ltd.
    Inventors: Yutaka Saito, Kouei Ozaki, Toshiaki Narukawa, Tsutomu Ota
  • Patent number: 6532160
    Abstract: A switching power supply comprises a transformer 3, a switching circuit 1, an output rectifier circuit, an output smoothing circuit, and a snubber circuit. A snubber capacitor 17 has one terminal connected to the one terminal of a snubber diode 19. The other end of the snubber capacitor is led to an output winding 4 of the transformer, while the other terminal of the snubber diode is led to the other of the electrode of an output rectifier diode 7. A snubber inductor 23 has one end connected to the connecting point of the snubber capacitor and the snubber diode, and the other end is. connected to the input side of the output smoothing circuit. The polarity of the diode is arranged to establish a charging loop circulating through the snubber diode, the snubber capacitor and the output winding of the transformer, so as to provide a reduced loss, in a cycle in which the voltage appearing at the output winding of the transformer is the reverse direction to the output rectifier diode.
    Type: Grant
    Filed: January 3, 2002
    Date of Patent: March 11, 2003
    Assignee: TDK Corporation
    Inventors: Masahiko Hirokawa, Yasuhiro Murai, Tomomi Yamada
  • Patent number: 6493245
    Abstract: The present invention provides for an apparatus and corresponding method for controlling inrush current in an AC-DC power converter by controlling the state of a plurality of silicon-controlled rectifiers (SCRs) when AC power is lost. The present invention provides full control of inrush current even during cold startup, warm startup, and power line disturbance conditions. The present invention controls inrush current without the need for an extra series dissapative device and its consequent additional losses. The preferred embodiment includes use of the present invention for AC-DC converters having active power factor correction. An alternative embodiment is for use in non-power factor corrected applications.
    Type: Grant
    Filed: August 15, 2001
    Date of Patent: December 10, 2002
    Assignee: Astec International Limited
    Inventor: Vijay Gangadhar Phadke
  • Publication number: 20020154525
    Abstract: The invention relates to a circuit for converting AC voltage into DC voltage for one or two consumers (Rm, Ra), in which circuit a first part of the current is fed to the input side via a large induction coil (L50) and a first rectifier (Gm) and a second part of the current via a second rectifier (Ga) upstream of the large induction coil. On the output side, behind the second rectifier (Ga), a switched-mode power supply is arranged, preferably in the form of an up-converter or a flyback converter (10). The division of the applied current for smoothing the output voltage provides that the induction coil (L50) can be accordingly dimensioned smaller and, despite this, the circuit can also satisfy relevant standard specifications.
    Type: Application
    Filed: February 20, 2002
    Publication date: October 24, 2002
    Inventor: Thomas Duerbaum
  • Patent number: 6301139
    Abstract: A power converter has a self-driven synchronous rectification circuit that can operate efficiently with a non-optimal reset secondary voltage waveform that remains at a zero voltage level during a portion of the switching cycle. The power converter circuit includes a transformer having a primary winding and a secondary winding, in which primary winding is supplied with a non-optimal reset waveform that remains at a zero voltage level for a portion of a power cycle thereof. A first synchronous rectifier is connected in series with the first end of the secondary winding and is controlled by a voltage at the second end of the secondary winding. A second synchronous rectifier is connected in series with the second end of the secondary winding, and is further connected to an output terminal of the power converter circuit through a storage choke. A saturable reactor is connected in series between the first synchronous rectifier and the first end of the secondary winding.
    Type: Grant
    Filed: January 19, 2001
    Date of Patent: October 9, 2001
    Assignee: Power-One, Inc.
    Inventor: Amrit P. Patel
  • Patent number: 6108224
    Abstract: A phase-shift thyristor trigger circuit, including a synchronous signal sampling circuit, a waveform shaping, integrating and comparator circuit, a high-frequency modulating pulse distributor circuit, a power amplification and high frequency pulse rectifier output circuit, characterized in that said synchronous signal sampling circuit includes a transformer, wherein its secondary inductance and a capacitor form a LC resonance circuit for selecting (via transformer coupling) synchronous signal from the main circuit. The trigger circuit connecting with a thyristor main circuit can make up a unified thyristor integrated module. The module is small in size, strong in antiinterference ability, has no requirements for phase sequence and number, and has a broad voltage adaptive range.
    Type: Grant
    Filed: August 11, 1999
    Date of Patent: August 22, 2000
    Inventor: Jie Cao
  • Patent number: 5995395
    Abstract: The present invention relates to a device for controlling a composite bridge including two anode-gate thyristors, the cathodes of which are connected together to a positive output terminal, the gates of the two thyristors being interconnected. The device includes a single-throw switch, controllable to be turned off and on, connected on the one hand to the two thyristors and on the other hand to a reference potential, and control means to turn on the switch only in a predetermined voltage range around the zero voltage of an a.c. voltage of the composite bridge.
    Type: Grant
    Filed: March 27, 1997
    Date of Patent: November 30, 1999
    Assignee: SGS-Thomson Microelectronics S.A.
    Inventor: Bertrand Rivet
  • Patent number: 5519600
    Abstract: In a delta-connected power supply system, phase switching circuits are employed and are activated during the failure of one of N+1 converter units. This activation is employed even though there has been no outage in any one of the input phases. The result is two operating converters running in effect as three-phase converters. Since each of the converters then acts as a full wave three-phase bridge with a resistor load, the line currents are perfectly balanced although unity power factor is not maintained during this non-normal mode of operation. In such circumstances, higher power factor is temporarily sacrificed to achieve continuous operation and therefore higher overall system reliability.
    Type: Grant
    Filed: March 31, 1995
    Date of Patent: May 21, 1996
    Assignee: International Business Machines Corporation
    Inventor: Steven J. Ahladas
  • Patent number: 5483435
    Abstract: A power generation system is constituted by an induction generator and a converter. An output current waveform of the induction generator is determined by the magnetic flux, speed, winding impedance, DC output voltage, and load of the induction generator. In particular, the output current waveform is changed in accordance with a change in speed (i.e., change in slip). Switching elements in the converter are ON/OFF-controlled in accordance with changes in current waveform, thereby controlling power generation of the induction generator.
    Type: Grant
    Filed: March 14, 1994
    Date of Patent: January 9, 1996
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Hiroshi Uchino
  • Patent number: 5260863
    Abstract: For controlling the current in an inductive load, the gate current used to fire thyristors in a rectifier is controlled to reach zero at exactly the same time, within a given half-wave, as the current in the inductive load which receives the voltage from the rectifier, keeping gate voltage on as long as thyristor current is on. A discontinuous thyristor converter current signal is detected and used to generate an enable signal in conjunction with a thyristor gate voltage. The enable signal, in synchronism with a power supply line voltage, provides a pair of channeling signals which then, depending upon whether the field current is positive or negative, activate the gate voltages of the thyristors such that the gate voltages end exactly at that time, within a given half-wave, where the generator field current becomes discontinuous.
    Type: Grant
    Filed: December 20, 1991
    Date of Patent: November 9, 1993
    Assignee: Otis Elevator Company
    Inventors: Bernd L. Ackermann, Peter L. Herkel
  • Patent number: 4811189
    Abstract: The invention relates to an AC voltage supplied rectifier circuit with a downstream smoothing capacitor. A prior art problem with this type of circuit was that the inductive impedance of the supply voltage caused a practically umdamped oscillation between the inductive supply impedance and the smoothing capacitor during start-up which caused the voltage to rise to about twice the stationary value. A rectifier circuit is provided which substantially prevents the over-oscillation having at least one controllable rectifier which brings the rectifier to a conductive state during the charging period of the smoothing capacitor over such a time that the output direct voltage of the rectifier circuit exceeds the momentary capacitor voltage by no more than a predetermined limited value.
    Type: Grant
    Filed: March 28, 1988
    Date of Patent: March 7, 1989
    Assignee: Danfoss A/S
    Inventors: Nils-Ole Harvest, Jorgen Rasmussen
  • Patent number: 4780802
    Abstract: The present invention relates to a power source apparatus for supplying a stabilized D.C. output to an inverter. In a D.C. power source apparatus for an inverter comprising a forward power conversion circuit receiving commercial A.C. power supply for outputting D.C. power such as a thyristor rectifying circuit and control circuit for controlling the D.C. output voltage of said forward power conversion circuit, the disclosed D.C. power source apparatus for an inverter is provided with feedforward control circuit detecting the D.C. input current to the inverter. The D.C. current input to the inverter or a current equivalent thereto is detected by the feedforward control circuit as a detection signal, and based on this detection signal, an A.C. component virtually in phase with the A.C. component input to the inverter is output from the forward power conversion circuit, and thereby, the D.C. voltage ripple to the inverter is decreased.
    Type: Grant
    Filed: March 27, 1987
    Date of Patent: October 25, 1988
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Takeshi Miyashita, Takao Kawabata
  • Patent number: 4729082
    Abstract: The invention relates to the control of a power converter in which the AC side is connected through a reactor to an AC power supply while the DC side is connected to a smoothing capacitor and a load and the power rectification and the power inversion are carried out by the pulse width modulation control. The controls performed include (1) the control, whereby the voltage across the smoothing capacitor coincides with a predetermined value and the current flowing through the reactor and the voltage of the AC power supply have a predetermined phase relationship; (2) the DC component compensation control for eliminating the DC component in an AC circuit within a short time interval and (3) the control of the power conversion operation by utilizing a microprocessor while suppressing the higher harmonics in the AC power supply. The control (1) is performed by using an amplitude signal of the voltage on the AC side of the power converter and a phase difference signal relative to the AC power supply voltage.
    Type: Grant
    Filed: November 20, 1986
    Date of Patent: March 1, 1988
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Hirokazu Sato
  • Patent number: 4725939
    Abstract: A system for supply of direct current to at least two electrical loads having a common polarity, especially for power supply to an arc furnace with several electrodes or to plasma generators, comprises a set of load-controlled rectifiers (7) arranged in a Graetz bridge (A, B, C), in parallel upon a common alternating current power supply (5, 6). The half-bridges (A.sub.2, B.sub.2, C.sub.2) situated on the common-polarity side have a common dephasing control voltage, while the half-bridges (A.sub.1, B.sub.1, C.sub.1) situated on the other side are each controlled individually. This mechanism can be used in particular for power supply to arc furnaces or plasma torches.
    Type: Grant
    Filed: October 1, 1986
    Date of Patent: February 16, 1988
    Assignee: Jeumont-Schneider Corporation
    Inventor: Claude Boisdon
  • Patent number: 4641234
    Abstract: The present invention relates to supplying a load either from a direct-current source or from an alternating-current source. The power unit, according to the invention, is characterized in that it consists of a single conversion unit (CV) having unidirectional semi-conductor power components forming switches (I1, I2, I3, I4) controlled in appropriate fashion by a logic control in such a manner as to ensure the functioning of the conversion unit (CV) either in a chopper mode, or in a rectifier mode when the load functions to draw power, or to ensure energy regeneration when the load functions in a generating mode. The present invention has application particularly for supplying direct-current motors used in dual-current railroad locomotives.
    Type: Grant
    Filed: December 10, 1984
    Date of Patent: February 3, 1987
    Assignee: Jeumont-Schneider Corporation
    Inventor: Jean Bonal
  • Patent number: 4636932
    Abstract: A dv/dt protection circuit device for an AC-DC converter apparatus including control board switching arrangement having a current cut-off function which conducts an interrupts current from a power source to a load and refluxes the load current while the current is uninterrupted by a full-wave bridge rectifier circuit having a plurality of arms. Each arm of the bridge rectifier circuit connects a reactor for suppressing a rate of change of a power source line voltage of the bridge rectifier circuit at the switching time of the switching arrangement and a condenser is provided for absorbing an overvoltage generated at an inductance on the side of the power source, the condenser being connected on the side of the power source connected to the bridge rectifier circuit.
    Type: Grant
    Filed: March 11, 1985
    Date of Patent: January 13, 1987
    Assignees: Hitachi, Ltd., Hitachi Engineering Co., Ltd.
    Inventors: Toshiaki Kurosawa, Seiya Shima, Takeki Ando, Hiromi Inaba, Hajime Nakashima, Toshisuke Mine
  • Patent number: 4618921
    Abstract: A power supply system for supplying a load current to a load including a serially connected circuit of a controlled rectifier, a switch and a capacitor. A diode is connected in parallel with the capacitor or with a serially connected circuit of the switch and the capacitor and a control circuit. Which controls the controlled rectifier such that when a first voltage between the capacitor is larger than or equal to a specified voltage the controlled rectifier is operated as bypass pair mode and when the first voltage is below the specified voltage the controlled rectifier is operated as current control mode. A method for starting a power supply system is also disclosed.
    Type: Grant
    Filed: August 13, 1985
    Date of Patent: October 21, 1986
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hiroshi Ikeda, Osamu Higa
  • Patent number: 4468724
    Abstract: A load DC motor is supplied with a DC current through a converter principally consisting of thyristors controlled by an ON-state control signal. The load current is detected both as to the mean value and the variation in time thereof. The mean value of the load current is calculated based on the load current values detected at the time of the present On-signal and the preceding ON-signal. The difference between the reference value and the mean value of the load current is calculated, and the difference between this differential signal and the variation of the load current is further calculated, so that the timing for providing the ON-signal is calculated based on the resultant differential signal.
    Type: Grant
    Filed: April 2, 1982
    Date of Patent: August 28, 1984
    Assignee: Hitachi, Ltd.
    Inventors: Tsutomu Omae, Toshihiko Matsuda, Makoto Tachikawa
  • Patent number: 4467408
    Abstract: A phase-controlled ac-to-dc rectifying circuit includes a pair of alternately conducting main controllable electric valves and cyclically operative forced commutation means for turning off the main valves. The forced commutation means comprises a pair of auxiliary controlled rectifiers respectively connected, in circuit with a commutating capacitor, across the main valves, and the auxiliary rectifiers are alternately turned on in response to periodic trigger signals that are normally produced by associated control means. Protective means is provided for inhibiting the trigger signals when the magnitude of voltage across the commutating capacitor is lower than a critical level which depends on the magnitude of the current being conducted by the main valves, thereby avoiding a risk of commutation failure due to low capacitor voltage.
    Type: Grant
    Filed: December 29, 1982
    Date of Patent: August 21, 1984
    Assignee: General Electric Company
    Inventors: Edward S. Matulevich, Herbert J. Brown, Ajith K. N. Kumar
  • Patent number: 4450516
    Abstract: The invention relates to a device particularly adapted for use with the power supply of a computer for controlling the regulating facilities in an electric high-power AC-DC converter of the power supply.This control device (D) comprises a regulation (CC) control comparator connected to the storage facilities (S) of the converter and receiving a reference voltage having a "nominal" value when the converter is normally powered by an AC network and receiving a portion of the output voltage from the converter, the output of said control comparator (CC) supplying an error signal to the regulating facilities (MR) of the converter. The control device also includes facilities (R) for supplying a variable reference voltage to the control comparator (CC) so that at the moment of recovery of the network following a cutoff, the voltage at the input of the filtering facilities (F) of the converter is, at the most, equal to the output voltage of the storage facilities (S).
    Type: Grant
    Filed: December 23, 1981
    Date of Patent: May 22, 1984
    Assignee: Compagnie Internationale pour l'Informatique CII-Honeywell Bull (Societe Anonyme)
    Inventor: Andre Gerard
  • Patent number: 4450385
    Abstract: A ballast circuit for direct current gaseous electrical discharge devices includes a rectifying bridge, and an inductive ballast for storing excess energy. The rectifying bridge uses a pair of thyristors which must be gated on for the bridge to supply rectified voltage to the inductor and device. Gating is delayed at the beginning of each half-cycle to allow the inductor to discharge most of its stored energy.
    Type: Grant
    Filed: August 9, 1982
    Date of Patent: May 22, 1984
    Assignee: GTE Laboratories Incorporated
    Inventor: Carl F. Buhrer
  • Patent number: 4376968
    Abstract: When a-c power line voltage is rectified by a phase-controlled SCR rectifier bridge to develop an adjustable d-c bus voltage which is then converted by an inverter back to a-c for driving a load, such as a motor, line voltage disturbances, resulting from momentary power outages or major power reductions, will have a deleterious effect on the operation of the inverter system. Such disturbances will cause improper firing of the SCR's and the d-c bus voltage may increase considerably, disrupting the normal operation of the inverter system and possibly destroying the switching devices in the inverter. Immunization against the effects of the line voltage disturbances is obtained by shutting down or disabling the phase-controlled SCR rectifier bridge anytime such a disturbance occurs.
    Type: Grant
    Filed: February 13, 1981
    Date of Patent: March 15, 1983
    Assignee: Borg-Warner Corporation
    Inventors: Russel P. Wueschinski, Edward C. Siemon
  • Patent number: 4315305
    Abstract: By controlling the phase angle at which conduction occurs in the SCR's in an SCR rectifier bridge, a d-c voltage of adjustable magnitude may be produced from a-c line voltage applied to the bridge. The specific angle at which the SCR's are fired into conduction during each half cycle of the a-c line voltage is determined by comparing a ramp-shaped pulse, produced from the line voltage during each half cycle, with an error signal which varies as a function of the difference between the desired d-c magnitude and the actual amplitude of the d-c voltage. The d-c power supply is made immune to line voltage variations by regulating the ramp-shaped pulses so that they always have the same pulse width regardless of line voltage amplitude, thereby facilitating precise control over the d-c magnitude.
    Type: Grant
    Filed: September 12, 1979
    Date of Patent: February 9, 1982
    Assignee: Borg-Warner Corporation
    Inventor: Edward C. Siemon
  • Patent number: 4233558
    Abstract: A dual section power supply, one section for supplying high voltage dc po and the other section for supplying low voltage dc power, are each connected to a common ac source. The high voltage section employs a phase-controlled rectifier, the control circuit for which employs logic signal development using timer techniques dependent on the amplitude of voltage deviation from the intended regulated output level. Each of two low voltage sections employs a power switch controlled by sampling and pulse steering techniques to effect fixed high frequency, variable duty cycle switching. An inhibit input is supplied from each of the low voltage sections to the high voltage section to prevent a high voltage output to the load in the absence of low voltage development.
    Type: Grant
    Filed: September 22, 1978
    Date of Patent: November 11, 1980
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Robert F. Gaertner
  • Patent number: 4204148
    Abstract: A regulation circuit for providing timing gate signals to the dc power section of a power supply, the regulation circuit utilizing phase angle conduction of a programmable unijunction transistor. The conduction angle is determined by the occurrence of the cycles of the ac source voltage unless earlier conduction is determined by the sensed dc voltage. Early conduction occurs when the control voltage to the PUT is allowed to build up beyond a predetermined level when the sensed dc voltage is low. When the sensed dc voltage is high, an electronic switch closes to discharge a storage element to prevent control voltage build up and, hence, early conduction. When there is an ac source voltage outage, a diode connected to the control voltage output conducts to keep the control voltage to zero and hence closing of the electronic switch to prevent undue regulation of the power section output at such times and to permit storage capacitors therein to maintain a dc output until source voltage is reestablished.
    Type: Grant
    Filed: July 24, 1978
    Date of Patent: May 20, 1980
    Assignee: Esquire, Inc.
    Inventor: Robert F. Gaertner
  • Patent number: 4164016
    Abstract: A circuit for sensing the current applied to a load in power supplies, inverters, and other power conversion equipment and similar systems wherein the voltage between the center tap of the transformer secondary winding and the junction of two resistors connected across the secondary winding in series is sensed. The control circuit for the electronic system adjusts the overall system operation to obtain the desired volt-ampere output in response to this voltage level.
    Type: Grant
    Filed: November 13, 1978
    Date of Patent: August 7, 1979
    Assignee: ESB Incorporated
    Inventor: Walter F. Schuchard
  • Patent number: 4161022
    Abstract: A controllable rectifier circuit which may be used in a power supply selectively produces a half-wave or a full-wave rectified signal. The rectifier circuit includes a pair of input terminals for receiving an AC signal and a bridge rectifier coupled to the input terminals and including a pair of output terminals across which a rectified AC signal is produced. The bridge rectifier comprises a first current path including a switchable rectifier for conducting positive half cycles of the AC signal and a second current path including a switchable rectifier for conducting negative half cycles of the AC signal. A pulse generator is supplied with reduced amplitude versions of the positive and negative half cycles of the AC signal, in sequence, to produce an output pulse when the reduced amplitude of the half cycle supplied thereto is less than a predetermined level.
    Type: Grant
    Filed: August 7, 1978
    Date of Patent: July 10, 1979
    Assignee: Sony Corporation
    Inventors: Kenichi Kanazawa, Nobuyuki Takahashi
  • Patent number: 4144559
    Abstract: A power converter control system for use with a power converter of the type which comprises a plurality of cascade-connected converter units of which at least one converter unit is subjected to continuous control of its conduction phase angle and the remaining converter units are subjected to on-off control of their conductivity is arranged to include a master controller for instructing the number of the converter units to be rendered operative, a reversible counter operative to change its content in response to a phase controlling command applied to the continuously controlled converter unit indicating a maximum or minimum conduction phase angle or delayed phase angle in conduction, a unit change control unit for producing unit changing operation signals to be applied to the respective converter units for controlling the operation of the same, by using one of the binary bits derived from the counter without modification and decoding the remaining bits, and a comparing and identifying circuit which compares t
    Type: Grant
    Filed: August 31, 1977
    Date of Patent: March 13, 1979
    Assignee: Hitachi, Ltd.
    Inventors: Yoshio Okumura, Kyozo Tachibana, Hiroshi Sato, Genichi Matsumoto
  • Patent number: 4122514
    Abstract: A direct current voltage power supply in which spaced pulses of current are made to flow through the primary winding of a power transformer. The anode-cathode path of an SCR device is connected from a point on a secondary winding to an output capacitor. A pulse width modulation circuit and a base drive circuit are connected between the output capacitor and the gate electrode of the SCR device so as to apply a pulse to the gate electrode that enables conduction between the source and drain electrodes whenever the voltage across the output capacitor drops below a given reference value.
    Type: Grant
    Filed: November 1, 1976
    Date of Patent: October 24, 1978
    Assignee: Hewlett-Packard Company
    Inventor: Dilip A. Amin
  • Patent number: 4118769
    Abstract: A circuit comprising first and second rectifiers for supplying rectified current or voltage to a storage capacitor located at the output of the circuit. The circuit includes a control circuit operatively coupled between the output and the silicon controlled rectifiers to insure that alternate ones of the silicon controlled rectifiers will supply the rectified current or voltage to the storage capacitor as needed.
    Type: Grant
    Filed: June 20, 1977
    Date of Patent: October 3, 1978
    Assignee: NCR Corporation
    Inventor: Denney Lee Wilson, Sr.
  • Patent number: 4090234
    Abstract: A noise free circuit for a transformer secondary having SCR taps which are rendered selectively conducting thereby varying the effective turns ratio of the transformer and providing an instantaneous input tap changer responsive to wide variation in input voltage.
    Type: Grant
    Filed: October 12, 1976
    Date of Patent: May 16, 1978
    Assignee: AMP Incorporated
    Inventor: Meade Goodman Bierly
  • Patent number: 4074345
    Abstract: An electronic power supply utilizes a full wave bridge rectifier circuit whose alternating current voltage source is derived from a multi-primary and multi-secondary winding transformer whose windings are selectively disposed in series or parallel circuits, thereby enabling the apparatus to be effectively employed on a wide variety of A.C. voltage sources. Two adjacent legs of the bridge rectifier employ S.C.R.'s gated simultaneously symetrically by pulses obtained from a unijunction transistor driven by the output of an operational amplifier whose input terminals are coupled to voltage and current sensing networks located at the output terminals of a filter coupled to the D.C. side of the full wave bridge.
    Type: Grant
    Filed: November 2, 1976
    Date of Patent: February 14, 1978
    Inventor: Walter J. Ackermann