External To Rectifier (e.g., Pre Or Post Regulation) Patents (Class 363/86)
  • Patent number: 9134743
    Abstract: A low-dropout voltage regulator includes a power transistor configured to receive an input voltage and to provide a regulated output voltage at an output voltage node. The power transistor includes a control electrode configured to receive a driver signal. A reference circuit is configured to generate a reference voltage. A feedback network is coupled to the power transistor and is configured to provide a first feedback signal and a second feedback signal. The first feedback signal represents the output voltage and the second feedback signal represents an output voltage gradient. An error amplifier is configured to receive the reference voltage and the first feedback signal representing the output voltage. The error amplifier is configured to generate the driver signal dependent on the reference voltage and the first feedback signal. The error amplifier includes an output stage that is biased with a bias current responsive to the second feedback signal.
    Type: Grant
    Filed: April 30, 2012
    Date of Patent: September 15, 2015
    Assignee: Infineon Technologies Austria AG
    Inventors: Glovanni Bisson, Marco Flaibani, Marco Piselli
  • Patent number: 9134745
    Abstract: A circuit arrangement is for operating a load having a reactive characteristic on an AC power supply. The circuit arrangement enables the best possible reactive power compensation, that is, enables operation close to a cos ? of 1, in order to increase the overall efficiency of the arrangement or to achieve optimal energy savings. In order to control critical operating states, a feedback loop is provided that supplies a control current to a further reactive circuit element. This further circuit element is arranged parallel to the load or to the power factor correction capacitor, and is acted upon by a control current such that the control current counteracts a change in the reactive component of the load. The control current is derived from the load current as a variable proportional to the load current. In this way, a reactor for optimizing electromagnetic consumption is created.
    Type: Grant
    Filed: September 27, 2011
    Date of Patent: September 15, 2015
    Assignee: Permotors GmbH
    Inventor: Victor Arestov
  • Patent number: 8786214
    Abstract: A light emitting element drive device includes an electric conduction switch that is provided along a power input line, a voltage detection unit that detects a power source voltage containing a noise component when the electric power is supplied to the power input line, a conversion processing unit that converts the detected power source voltage containing the noise component to a digital value, a data generation unit that generates data of a predetermined number of bits, and a control unit that turns on the electric conduction switch. The control unit determines a delay time based on the predetermined number of bits. The delay time corresponds to a time between supplying the electric power to the power input line and turning on the electric conduction switch. The control unit turns on the electric conduction switch after the delay time passes. Thus, an excessive rush current is prevented.
    Type: Grant
    Filed: December 6, 2012
    Date of Patent: July 22, 2014
    Assignee: TDK Corporation
    Inventors: Kazunori Oshima, Hironobu Masuoka, Mitsuyuki Tsujisaka, Yukiharu Miyaoka
  • Patent number: 8587971
    Abstract: An electronic current transformer (ECT) based on complete self-excitation power supply is provided. The ECT includes an energy-obtaining coil, a rapid voltage-stabilizing circuit and an Analog/Digital (A/D) converting circuit. The output of the energy-obtaining coil is connected with the input of the voltage-stabilizing circuit. The output of the voltage-stabilizing circuit is connected with the control end of the A/D converting circuit. The ECT uses two branch circuits to obtain energy directly from the magnetic field of a bus bar to be measured respectively, synthesizes two output waveforms to fill the wave trough of each other, and reduces the pulse of direct current. In this way, the trough voltage of the synthesized wave is higher than the required stabilizing value of direct voltage and it directly meets the input requirement of the stabilizing module of the voltage-stabilizing circuit. As a result, the ECT can activate the A/D converting circuit rapidly.
    Type: Grant
    Filed: January 13, 2010
    Date of Patent: November 19, 2013
    Assignee: Xi'an Hwell Optic-Electric Tech Co., Ltd
    Inventors: Zhongzhan Liu, Xun Wu, Yanting Song
  • Patent number: 8570777
    Abstract: A power supply circuit includes a pulse width modulation (PWM) chip, a number of phase circuits, a voltage output end, and a spike suppression circuit. The spike suppression circuit is connected to each of the phase circuits and the voltage output end. The PWM chip controls all of the phase circuits to alternately output power supply voltages according to a predetermined sequence. The spike suppression circuit receives the power supply voltages, and filters out voltage spikes in the power supply voltages, thereby outputting steady voltages to the voltage output end.
    Type: Grant
    Filed: August 10, 2011
    Date of Patent: October 29, 2013
    Assignees: Hong Fu Jin Precision Industry (ShenZhen) Co., Ltd., Hon Hai Precision Industry Co., Ltd.
    Inventors: Qi-Yan Luo, Song-Lin Tong, Peng Chen
  • Patent number: 8542511
    Abstract: A single-phase voltage source AC/DC converter according to the present invention generates a second axis voltage command from difference between a DC voltage detection value at a DC terminal and a DC voltage command value and controls a DC voltage by increasing and decreasing active power with the second axis voltage command. For example, the voltage at the DC terminal is increased by decreasing active power when the DC voltage detection value at the DC terminal is lower than the DC voltage command, while the DC voltage detection value at the DC terminal is decreased by increasing the active power when the DC voltage detection value at the DC terminal is higher than the DC voltage command.
    Type: Grant
    Filed: December 19, 2011
    Date of Patent: September 24, 2013
    Assignee: Origin Electric Company, Limited
    Inventors: Masaaki Ohshima, Shuichi Ushiki, Jinbin Zhao
  • Patent number: 8482945
    Abstract: A power converter stabilizes a voltage by controlling leading of an AC current and performs maximum charging within contracted power reception amount when connected to a weak power system. The power converter comprises Magnetic Energy Recovery Switch comprising a bridge circuit including at least two reverse conductive type semiconductor switches and a magnetic energy accumulating capacitor with a small capacity connected between DC terminals of the bridge circuit. The power converter uses the Magnetic Energy Recovery Switch to perform power conversion from AC to DC or vise versa. Plurality of secondary battery charging devices each comprising the power converter have a DC part connected to a common DC bus bar, so that power is accommodated among the secondary battery charging devices.
    Type: Grant
    Filed: September 26, 2008
    Date of Patent: July 9, 2013
    Assignee: MERSTech, Inc.
    Inventor: Naoto Kojima
  • Patent number: 8427853
    Abstract: A power factor correction converter includes a diode bridge that rectifies an alternating-current voltage input from an alternating-current input power supply Vac, a series circuit including an inductor and a switching element, a rectifying smoothing circuit connected in parallel with the switching element and including a diode and a smoothing capacitor, and a digital signal processing circuit that controls turning on and off of the switching element such that the input current input from the alternating-current input power supply Vac comes to have a similar shape to the alternating-current voltage. The current flowing through the inductor in the off period of the switching element is detected by using a current detection resistor, the operation mode is determined on the basis of the inductor current IL at a predetermined timing and the switching element is optimally controlled in accordance with the operation mode.
    Type: Grant
    Filed: September 15, 2011
    Date of Patent: April 23, 2013
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Yoshiyuki Uno
  • Patent number: 8400797
    Abstract: A power conversion system with zero-voltage start-up mechanism and a zero-voltage start-up device are disclosed. The system includes a power conversion circuit, a power factor correction unit, a storage capacitor, a storage switching unit, and a zero-voltage detection module. The storage switching unit is serially connected with the storage capacitor, and particularly controlled by the zero-voltage detection module. The zero-voltage detection module detects a timing as an input voltage is at low level, and then outputs a control signal to turn on the storage switching unit. Therefore, the present invention assures that the power conversion system is turned on when the input voltage is at the low level, in order to suppress the system from a surge current.
    Type: Grant
    Filed: July 23, 2010
    Date of Patent: March 19, 2013
    Assignee: Lien Chang Electronic Enterprise Co., Ltd.
    Inventors: Chun-Kong Chan, Hsi-Yuan Tsai
  • Patent number: 8379422
    Abstract: A method for operating a circuit arrangement is provided. The method may include coupling a second connection of a control device to a connection that provides an alternating signal during operation of the circuit arrangement; in the control device: generating a trigger signal for the control electrode of the mode switch that is correlated with the sum signal from the signal at the connection for providing an alternating signal and the control signal; and providing the trigger signal at the output of the control device.
    Type: Grant
    Filed: July 18, 2007
    Date of Patent: February 19, 2013
    Assignee: OSRAM Gesellschaft mit beschraenkter Haftung
    Inventors: Arwed Storm, Siegfried Mayer
  • Patent number: 8189355
    Abstract: A multiple-output switching power source apparatus includes a control circuit to adjust a time for applying a DC voltage to a primary winding of a transformer by turning on/off a switching element Q1, a first rectifying-smoothing circuit for a first secondary winding of the transformer, a second rectifying-smoothing circuit for a switching element Q2 to provide a second output voltage connected to an output terminal of the first rectifying-smoothing circuit through the switching element Q2, a third rectifying-smoothing circuit for a second secondary winding of the transformer and provide a third output voltage, a first end of the second secondary winding of the transformer being connected to the switching element Q2, and a control circuit 13 to adjust an ON/OFF time of the switching element Q2 according to the voltage of the first secondary winding of the transformer, the second output voltage, and the third output voltage.
    Type: Grant
    Filed: August 18, 2008
    Date of Patent: May 29, 2012
    Assignee: Sanken Electric Co., Ltd.
    Inventor: Yoichi Kyono
  • Patent number: 8072786
    Abstract: A power supply module is configured for converting an AC voltage to a first DC voltage and applying the first DC voltage to a load. The power supply module includes a rectifying and filtering unit, a PFC unit, a voltage transforming unit, an input port, and a switch unit. The rectifying and filtering unit rectifies the AC voltage into a primary DC voltage and filters the primary DC voltage. The PFC unit corrects a power factor of the filtered primary DC voltage. The voltage transforming unit converts the corrected primary DC voltage and generates the first DC voltage for applying the load. The input port receives a first instruction or a second instruction and generates a first signal or a second signal, respectively. The switch unit establishes or disconnects an electrical connection between the voltage transforming unit and the load according to the first signal or the second signal.
    Type: Grant
    Filed: September 25, 2009
    Date of Patent: December 6, 2011
    Assignees: Hong Fu Jin Precision Industry (ShenZhen) Co., Ltd., Hon Hai Precision Industry Co., Ltd.
    Inventor: Jian-Hui Lu
  • Patent number: 7978485
    Abstract: A thyristor power control circuit reduces EMI and maintains a holding current in the thyristor to prevent flickering at a load. The power control circuit includes a thyristor configured to receive an input AC voltage, and responsive to a gate pulse generates a modified AC voltage. A rectifier receives the modified AC voltage and generates a rectified DC voltage. A power converter coupled to the rectifier receives the rectified DC voltage and generates a controlled output current. A damping circuit coupled to an output terminal of the rectifier includes a damping resistor for maintaining the holding current in the thyristor during an ON period of the thyristor. The damping circuit includes a first capacitor coupled in series to the damping resistor and a diode coupled in parallel to the damping resistor. The diode enables the first capacitor to discharge without causing power loss at the damping resistor.
    Type: Grant
    Filed: May 2, 2008
    Date of Patent: July 12, 2011
    Assignee: STMicroelectronics, Inc.
    Inventors: Thomas Stamm, Vipin Bothra, Vee Shing Wong
  • Patent number: 7961486
    Abstract: The invention relates to a power supply system (3) intended to supply power to an electrical load (C), the system comprising: two input terminals, namely a negative terminal and a positive terminal, connected to a supply mains (A) delivering an AC voltage; an input capacitor (C1) connected to one of the terminals of the system; a rectifier module (33) for generating a DC voltage on a DC bus from the AC voltage; a bus capacitor (Cb) connected between a positive line (31) and a negative line (32) of the DC bus, and upstream of the input capacitor (C1), two normally-on bidirectional semiconductor transistors (T1, T2) connected in series, fabricated in a wide-bandgap material and able to operate in current-limiting mode.
    Type: Grant
    Filed: May 19, 2009
    Date of Patent: June 14, 2011
    Assignee: Schneider Electric Industries SAS
    Inventors: Sebastien Carcouet, Didier Leonard
  • Patent number: 7864552
    Abstract: An uninterruptible power supply (“UPS”) has a phase-controlled rectifier coupled to a source of AC power and having an output providing a DC bus, the output of the phase-controlled rectifier coupled to an inverter. A first controller generates a firing angle for the rectifier and a fuzzy logic controller generates a firing angle for the rectifier. In an aspect, the rectifier is controlled by the firing angle generated by the first controller during normal operating conditions of the UPS and the rectifier is controlled by the firing angle generated by the fuzzy logic controller during abnormal operating conditions of the UPS. The abnormal operating conditions can include loss of a direct DC bus voltage measurement and or a period of time after the UPS experiences a large load change.
    Type: Grant
    Filed: September 12, 2008
    Date of Patent: January 4, 2011
    Assignee: Liebert Corporation
    Inventors: Brian P. Heber, Xian Chen, Paul Taylor
  • Patent number: 7787263
    Abstract: Methods and apparatus to control a digital power supply are disclosed. An example method includes controlling a power factor controller by: receiving a first current signal flowing in a first stage of the power factor controller, receiving a second current signal flowing in a second stage of the power factor controller, determining a difference between the first current signal and the second current signal, determining if the magnitude of a measured current signal is above a predetermined threshold, activating an integrator to integrate the difference when the magnitude of the measured current signal is above a predetermined threshold, and outputting a first control signal and a second control signal to the power factor controller based on the output of the integrator.
    Type: Grant
    Filed: December 31, 2007
    Date of Patent: August 31, 2010
    Assignee: Texas Instruments Incorporated
    Inventors: Eric Gregory Oettinger, Mark David Hagen
  • Patent number: 7724062
    Abstract: An output buffer circuit that suppresses the generation of an erroneous operation signal during power activation includes a first level converter generating a first signal based on a data input signal having an amplitude range between a first power supply potential and a ground reference potential. The first signal has an amplitude range between a second power supply potential, which differs from the first power supply potential, and the ground reference potential. A second level converter generates a second signal having an amplitude range between the second power supply and ground reference potentials based on a control input signal having an amplitude range between the first power supply and ground reference potentials. The first signal falls with a delay from the second signal. An output circuit generates an output signal. A timing adjustment circuit compensates for the fall delay of the first signal during power activation.
    Type: Grant
    Filed: July 24, 2007
    Date of Patent: May 25, 2010
    Assignee: Fujitsu Microelectronics Limited
    Inventor: Hiroshi Miyazaki
  • Patent number: 7542314
    Abstract: Systems and methods presented herein generally provide for the controlled voltage of electrical energy through the selected operation of power stages. In one embodiment, a system that provides electrical energy includes a power supply and at least two power stages coupled to the power supply. The power stages are operable to selectively output electrical energy. By selecting the number of power stages which are turned on at a given time the total voltage of the electrical energy is controlled at that time. The use of air core magnetic flux coupling provides a unique, easily insulated method to provide power to the voltage stages at different potentials relative to each other. The system may further include one or more controllers coupled to the power stages to control selection of the power stages and thereby vary the output voltage.
    Type: Grant
    Filed: February 1, 2006
    Date of Patent: June 2, 2009
    Assignee: Applied Energetics, Inc.
    Inventor: Richard J. Adler
  • 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
  • Patent number: 7420827
    Abstract: There is disclosed a power converter having limited inrush current and an inrush current limiter circuit. The inrush limiting circuit may be a self-oscillating switching-mode average current regulator tp provide a relatively constant average charging current to a bulk capacitor until the bulk capacitor is fully charged. A bypass switch may be used to route current around the inrush current limiter circuit once the bulk capacitor is fully charged.
    Type: Grant
    Filed: October 10, 2006
    Date of Patent: September 2, 2008
    Assignee: Condor D.C. Power Supplies Inc.
    Inventor: Thomas M. Ingman
  • Patent number: 7411378
    Abstract: A power factor controller for a switching power supply, that in one embodiment couples a power factor control circuit between an AC input and an output wherein a digital controller computes circuit currents for regulating the power supply without direct current measurements.
    Type: Grant
    Filed: May 9, 2005
    Date of Patent: August 12, 2008
    Assignee: Embed, Inc.
    Inventors: Olin Lathrop, David Tweed
  • Patent number: 7362598
    Abstract: A power converter that includes a transformer, a bridge input circuit, a self-driven synchronous rectifier circuit, a gate drive circuit, and a gate drive shutdown circuit. The transformer includes a primary winding connected to the bridge input circuit, a first secondary winding, and a second secondary winding. The self-driven synchronous rectifier circuit is connected to the first secondary winding and includes a first synchronous rectifier for rectifying a voltage across the first secondary winding. The first synchronous rectifier includes a control terminal responsive to a voltage across the second secondary winding. The gate drive circuit includes a first diode connected to the control terminal of the first synchronous rectifier for introducing a dc level shift thereto.
    Type: Grant
    Filed: December 17, 2004
    Date of Patent: April 22, 2008
    Assignee: Artesyn Technologies, Inc.
    Inventors: Todd Martin Schaible, John Phillip Schmitz
  • Patent number: 7230838
    Abstract: Methods and apparatus are disclosed for suppressing circuit noise due to parasitic elements in switch mode power supplies. The presented embodiments use actively controlled damping devices such as controllable resistors, current sources, and tri-state power devices to achieve required damping and to minimize power loss.
    Type: Grant
    Filed: December 28, 2005
    Date of Patent: June 12, 2007
    Assignee: Monolithic Power Systems, Inc.
    Inventor: Peng Xu
  • Patent number: 7199562
    Abstract: In a switch mode power supply, a mains supply voltage source is coupled to a rectifier for producing an input supply voltage. The rectified input supply voltage is coupled unfiltered to an input of the SMPS. A switching power transistor having a controllable duty cycle is controlled by a duty cycle modulated signal for producing a regulated output supply voltage from the rectified input supply voltage. The periodic waveform of the mains supply voltage is used to establish the timings of the duty cycle modulated signal. In each cycle, current flow is initiated in the transistor, when the transistor is already fully turned on and a voltage developed between its main current conducting terminals is low or close to zero volts. When the output supply voltage attains the required level the transistor is turned off. Hysteresis is provided for preventing the transistor from turning on again in the same cycle, after it has been turned off.
    Type: Grant
    Filed: April 2, 2003
    Date of Patent: April 3, 2007
    Assignee: Thomson Licensing
    Inventor: Max Ward Muterspaugh
  • Patent number: 7075805
    Abstract: A voltage converter includes two input terminals, at least a current limiting portion, an electronic switch in the form of a transistor controlled by a control device in synchronization with the supply voltage, and a storage capacitor. Two output terminals taken from the storage capacitor supply the load, where the current limiting portion is formed by at least the primary of a transformer, and whose secondary output supplies a rectifier whose output terminals are connected to the load.
    Type: Grant
    Filed: September 24, 2002
    Date of Patent: July 11, 2006
    Assignee: Somfy SAS
    Inventor: Serge Bruno
  • Patent number: 7012825
    Abstract: The invention relates to a combined AC-DC to DC converter. The converter provides the option of coupling to an AC supply source with at least one phase and the further option of coupling to at least one DC supply source. The converter obtains supply from at least one supply source at a time; and the converter contains controllable contact means that are, upon switching between supply sources, capable of connecting and disconnecting the individual supply sources to/from the converter; whereby a pulse signal is generated. The converter contains at least one coil that is in connection with at least one DC output.
    Type: Grant
    Filed: January 22, 2002
    Date of Patent: March 14, 2006
    Assignee: American Power Conversion Denmark ApS
    Inventor: Henning Roar Nielsen
  • Patent number: 6987678
    Abstract: A power supply has an output circuit for a secondary stage of a converter that switches on and off a switching device such that the output voltage of the converter is regulated across a capacitor without use of an inductor in the output circuit. For example, the switching device is a semiconductor field effect transistor controlled by a comparator. The output circuit may be used with a switch mode power supply comprising a coreless, planar isolation transformer.
    Type: Grant
    Filed: October 23, 2003
    Date of Patent: January 17, 2006
    Assignee: International Rectifier Corporation
    Inventors: Marco Giandalia, Marco Passoni
  • Patent number: 6933626
    Abstract: Uninterruptible Power Supply (UPS) systems and methods for a communications signal distribution system, such as a cable television (CATV) signal distribution system that distributes a communication signal and an Alternating Current (AC) power over a coaxial cable having a conductor and a sheath, include an input neutral line and an input voltage line. A first circuit is configured to convert an input voltage between the input neutral line and the input voltage line into first and second complementary Direct Current (DC) voltages. A second circuit is configured to convert the first and second complementary DC voltages into an AC voltage between an output neutral line and an output voltage line, and to connect the output neutral line to a coaxial cable sheath and the output voltage line to a coaxial cable conductor. The first and second circuits are configured to connect the input neutral line to the output neutral line without an intervening transformer winding.
    Type: Grant
    Filed: July 16, 2001
    Date of Patent: August 23, 2005
    Assignee: Alphatec Ltd.
    Inventor: George W. Oughton, Jr.
  • Patent number: 6856526
    Abstract: A phase controlled drive circuit includes a drive circuit operable to provide gate signals to an SCR bridge circuit and a phase control circuit. The phase control circuit includes a first phase generator operable to generate a first phase signal, and a second phase generator operable to generate a second phase signal. The second phase signal is periodically reset to an initial value. A drive circuit actuator in the phase control circuit is operable to place the drive circuit in a first activation state when a sum of the first and second phase signals exceeds a threshold value, and is further operable to place the drive circuit in a second activation state when the sum of the first and second phase signals is less than the threshold value.
    Type: Grant
    Filed: May 4, 2004
    Date of Patent: February 15, 2005
    Inventors: Joseph F. Elek, Jeffrey G. Felty, Neil A. Kammiller, Dennis F. Knurek
  • Patent number: 6690145
    Abstract: A permanent magnet alternator including a stationary stator including a plurality of spaced stator poles projecting inwardly from the stator, a winding circuit wound through the spaces between the stator poles, a rotor assembly mounted for rotation within the stator, including a plurality of permanent magnets fixedly mounted on an outer circumferential surface of the rotor in alternating polarity, and a retaining shield for reducing the effects of centrifugal motion of the rotor during operation of the alternator.
    Type: Grant
    Filed: April 1, 2002
    Date of Patent: February 10, 2004
    Assignee: E-Tec Corporation
    Inventors: Julius J. Stevens, William C. Edmundson, Ronald E. Murray, Craig G. Young
  • Publication number: 20020186575
    Abstract: A control circuit for use with a switch power converter is disclosed. The control circuit includes a capacitor device electrically connected between a variable resistor of the feedback circuit and ground in series, a first divider resistor electrically connected between the variable resistor and the controlled switch circuit in series, a second divider resistor electrically connected between the first divider resistor and ground in series, and a controlled switch electrically connected among the controlled switch circuit, the first divider resistor and ground. The variable resistor has a resistance varying with a voltage value of the load. Furthermore, when an overall voltage value of the first and second divider resistors varies with the resistance of the variable resistor to switch the controlled switch for further optionally enabling the controlled switch circuit to allow the transformer with the peripheral circuit to process the energy transformation.
    Type: Application
    Filed: May 31, 2002
    Publication date: December 12, 2002
    Inventor: Chin-Li Wu
  • Patent number: 6465992
    Abstract: A preconditioner comprises a rectifier, a switch mode power supply, and a feedback path for feedback of a preconditioner output voltage to a control block. The rectifier is arranged to receive an AC voltage from a voltage supply and to rectify the AC voltage. The switch mode power supply is arranged to control the current in the rectifier. The control block has a bandwidth equal to or greater than the voltage supply frequency. The feedback path has a bandpass filter connected to the output voltage and generates a feedback signal based on the output voltage and an output signal from the bandpass filter. The feedback signal has reduced ripple around the passband of the filter.
    Type: Grant
    Filed: December 6, 2001
    Date of Patent: October 15, 2002
    Assignee: Koninklijke Philips Electronics N.V.
    Inventor: Humphry Rene De Groot
  • Patent number: 6434029
    Abstract: A boost converter topology is disclosed that includes a resonant network comprising a snubber inductive element having a primary winding connected in series to a first resonant diode that is connected, at a first node, to two series connected additional resonant diodes and a secondary winding coupled to a fourth resonant diode connected to the first node. The present invention has the advantage of reducing the energy stored in the parasitic capacitor of the first resonant diode by a factor of four at the turn off of the main control switch. This reduction is achieved by allowing only a small amount of energy transfer to the snubber inductive element so that it does not turn the two additional resonant diodes on before the auxiliary switch is turned on, thus reducing losses and EMI associated with turning on the auxiliary switch.
    Type: Grant
    Filed: October 17, 2001
    Date of Patent: August 13, 2002
    Assignee: Astec International Limited
    Inventors: Jean-Marc Cyr, Richard Verreau
  • Publication number: 20020105819
    Abstract: A device for producing electricity, the device comprising a three-phase alternator comprising three windings, a rectifier for converting the AC delivered by the alternator into rectified current, and a voltage-raising chopper using the self-inductance of the alternator to raise the voltage. The device includes a switch unit enabling the three windings to be connected either in a star configuration when the alternator is being rotated to produce electricity, or else to the respective phases of a three-phase network when the alternator is stopped.
    Type: Application
    Filed: December 13, 2001
    Publication date: August 8, 2002
    Inventors: Regis Giraud, Christian Andrieux, Christophe Cester
  • Patent number: 6388906
    Abstract: A regulator system includes a circuit regulating the output of a power supply such as a capacitive input filter power supply and preferably also a transformer and full-wave diode bridge.
    Type: Grant
    Filed: April 20, 2001
    Date of Patent: May 14, 2002
    Assignee: Bogen Communications, Inc.
    Inventor: Isaac Ferstenberg
  • Patent number: 6337802
    Abstract: A voltage-source converter is connected on its ac-voltage side to a three-phase electric power network via a transformer and on its dc-voltage side to capacitor equipment. The transformer has on its secondary side a first, a second, and a third phase winding, each one with a first and a second winding terminal. Resistor equipment is arranged at the transformer for limiting the current through the converter when connecting the transformer to the power network.
    Type: Grant
    Filed: June 20, 2001
    Date of Patent: January 8, 2002
    Assignee: ABB AB
    Inventors: Tomas Larsson, Bjorn Thorvaldsson, Bo Akesson
  • Patent number: 6297979
    Abstract: An in-rush current controller for a mains power rectification circuit including a fill wave rectifier and a capacitor. A serial resistor suppresses in-rush currents. The controller includes a sensing circuit that controls a pair of silicon controlled rectifiers to cyclically shunt or isolate the resistor during normal operation. Thus, power is not dissipated by the resistor and undesirable heat is not generated during normal operation. The sensing circuit responds to abrupt rises in voltage (typical of in-rush current conditions) to inhibit turn ON of the rectifiers so that the resistor is not shunted or isolated at such times.
    Type: Grant
    Filed: December 21, 1999
    Date of Patent: October 2, 2001
    Assignee: PI Electronics (Hong Kong) Limited
    Inventor: Man Sing Tse
  • Patent number: 6288918
    Abstract: Switched power converter with hold-up time and harmonics reduction connected to an AC power mains through a first rectifier means (13) and connected to conversion means (19) supplying a regulated voltage. An energy storage means (16) connected in parallel with the rectifier means (13), absorbs or supplies current to the conversion means (19), by adapting the conducting periods of two switching devices in such a way that determines the voltage level on the storage means (16) and assures a sinusoidal current at input terminals (11, 12). The two switching devices are switched in a complementary manner by means of a first control means included in the energy storage means (16).
    Type: Grant
    Filed: November 15, 1999
    Date of Patent: September 11, 2001
    Assignee: Alcatel
    Inventors: Antonio Fontan Tarodo, Enrique De La Cruz Moreno, Salvador Ollero Velasco
  • Patent number: 6269012
    Abstract: An output voltage of a rectification smoothing circuit is compared with a reference voltage. When a reduction in the output has been detected, an A/D converting circuit converts a result of the comparison which is negatively fed back by an output voltage feedback circuit to obtain a control signal for a bidirectional switch element inserted into a primary side of a transformer so as to turn ON or OFF synchronously or asynchronously with a commercial power supply via an intermittent control circuit.
    Type: Grant
    Filed: June 20, 2000
    Date of Patent: July 31, 2001
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hiromi Kusakabe, Osamu Hosohata
  • Patent number: 6246218
    Abstract: In a method for stabilizing a power supply network against fluctuations of the reactive power of an electrical system, in particular of an arc furnace (5), having at least one transformer (3), the at least one transformer (3) is switched on and off on the supply network side in switching sequences which result in a fundamental-frequency power factor with a value at least approximately equal to 1. The fundamental-frequency reactive power is thus at least approximately equal to zero.
    Type: Grant
    Filed: September 30, 1999
    Date of Patent: June 12, 2001
    Assignee: Asea Brown Boveri AG
    Inventor: Shripad Tambe
  • Patent number: 6205041
    Abstract: A power supply circuit for an electronic thermostat includes a half wave rectifier, at least one voltage dropping resistor and a gated rectifier. The gated rectifier preferably conducts only when the voltage at its output drops below the voltage at its gate. The voltage at the gate is defined by gating circuitry downstream of the voltage dropping resistors. The intermittent conduction of the silicon controlled rectifier produces less current flow through voltage dropping resistors within the power supply circuit. This causes less heat dissipation by these resistors within the thermostat.
    Type: Grant
    Filed: July 28, 1999
    Date of Patent: March 20, 2001
    Assignee: Carrier Corporation
    Inventor: Thomas C. Baker
  • Patent number: 6072708
    Abstract: A switching regulator device for charging applications includes a transformer (18) which receives an AC input signal from an AC source (12) which is then rectified with a bridge rectifier (24). A regulation control circuit (26) is provided for regulating the output level of the bridge circuit (24) to a load (20). The regulation circuit (26) includes a switching element (62) which is operable to draw current from the AC source (12) in a periodic manner. The on/off duty cycle of the control to the switching element (62) will allow energy to be stored in a leakage inductance (36) of the transformer (18). The transformer (18) therefore comprises the switching inductance of a switching power supply with the leakage inductance (36) designed to provide adequate regulation for the voltage and current supplied to the load (10).
    Type: Grant
    Filed: August 1, 1996
    Date of Patent: June 6, 2000
    Assignee: Benchmarq Microelectronics, Inc.
    Inventor: Mark Charles Fischer
  • Patent number: 6023419
    Abstract: The active capacitor regulating type controllable voltage and current power supply circuit is disclosed with a voltage reducing and current limiting rectifying circuit which is constituted by capacitors and a bridge type current rectifier device, wherein it is characterized in that the output terminals of the rectifying circuit are parallel installed with a current distributing circuit device, thereby to actively control the output voltage setting status.
    Type: Grant
    Filed: December 8, 1997
    Date of Patent: February 8, 2000
    Inventor: Tai-Her Yang
  • Patent number: 6014324
    Abstract: A voltage regulator (12) for controlling and limiting the output voltage of an alternator (10) includes a control circuit having a full wave rectifier (28) for impressing a series of half wave pulses (32) onto a first circuit (34) in correspondence to the output of the alternator (10). A gate controlled switch (36) is utilized to conduct the half wave pulses (32) to the output circuit (24) when a gate signal is present. A voltage detector (44) monitors the output voltage and shunts the gate signal to ground when the output voltage reaches a given upper value and removes the shunt when the output voltage recedes to a given lower value.
    Type: Grant
    Filed: July 15, 1998
    Date of Patent: January 11, 2000
    Assignee: The Whitaker Corporation
    Inventor: Gary Lee Deck
  • Patent number: 5838555
    Abstract: A two-wire power supply switch connected in series with a load between two poles of an alternating current mains electrical power supply conventionally includes a main triac between two terminals of the switch which is turned on by the conduction of an optotriac with a time-delay relative to the zero crossing of the voltage between the switch terminals determined by the breakdown voltage of a series of Zener diodes. The switch includes a power supply unit with a rectifier bridge connected to one terminal directly and connected to the other terminal via a capacitor. An auxiliary triac shunting the capacitor is turned on by the optotriac on each zero crossing of the voltage between the switch terminals. This optimizes conditions when the switch is open and when the switch is closed separately.
    Type: Grant
    Filed: September 24, 1997
    Date of Patent: November 17, 1998
    Assignees: Legrand, Legrand SNC
    Inventors: Pascal Lejeune, Dominique Selas
  • Patent number: 5818704
    Abstract: An isolated forward switching power converter includes a primary side circuit and a secondary side circuit having an output inductor, a first MOS gated transistor coupled in series with the output inductor, a second MOS gated transistor coupled in shunt relationship with the output inductor, and a synchronous rectifier control circuit which senses the voltage across the output inductor and alternately biases the first and second transistors on and off in response thereto.
    Type: Grant
    Filed: April 17, 1997
    Date of Patent: October 6, 1998
    Assignee: International Rectifier Corporation
    Inventor: Roberto Martinez
  • Patent number: 5812386
    Abstract: A power supply control circuit generates DC power output intermittently at predetermined intervals during a power saving mode of operation, so as to save power. The power supply control circuit includes an AC power circuit for receiving AC power and for outputting the AC power for a predetermined time; a DC power generator connected to the AC power circuit for converting the AC power into DC power; and a controller receiving a power-on/off signal generated from a power switch, for generating a first power control signal of a first logic state in response to the power-on signal and for generating a second power control signal alternating between the first logic state and a second logic state in response to the power-off signal. The second power control signal alternates between the first and second logic states at predetermined intervals.
    Type: Grant
    Filed: February 28, 1997
    Date of Patent: September 22, 1998
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Hee-Myung Youn
  • Patent number: 5745357
    Abstract: A multi-output switching power unit which can substantially prevent an output power supply of an auxiliary output power circuit from dropping significantly when a load a is light and which has a reduced loss in the output path. A voltage up capacitor 20, a first diode 21, a second diode 22 and a series regulator 13 are provided in the auxiliary output power circuit 9 including a choke rectifier circuit 4. When the load a is light and an output voltage V2 of the auxiliary output power circuit 9 drops to below the predetermined voltage of the series regulator, the series regulator 13 is put into a conductively connected state.
    Type: Grant
    Filed: June 7, 1996
    Date of Patent: April 28, 1998
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Tadahiko Matsumoto
  • Patent number: 5740026
    Abstract: A power conditioning circuit for use in a power supply includes a power input and a power output. The circuit also includes a series connected RFI-EMI filter, rectifier, and SCR between the power input and the power output. The SCR has a control input for switching the SCR on and off, thereby interrupting current flow between the power input and the power output. An energy storage circuit is connected across the power output. Furthermore, the circuit includes a control circuit coupled to the control input of the SCR for switching the SCR on and off to maintain a regulated voltage at said power output in response to an AC input. A conditioned DC output is produced in response to a DC input.
    Type: Grant
    Filed: September 20, 1996
    Date of Patent: April 14, 1998
    Assignee: The Foxboro Company
    Inventor: Gregory Michael Karol
  • Patent number: RE40320
    Abstract: A permanent magnet alternator including a stationary stator including a plurality of spaced stator poles projecting inwardly from the stator, a winding circuit wound through the spaces between the stator poles, a rotor assembly mounted for rotation within the stator, including a plurality of permanent magnets fixedly mounted on an outer circumferential surface of the rotor in alternating polarity, and a retaining shield for reducing the effects of centrifugal motion of the rotor during operation of the alternator.
    Type: Grant
    Filed: March 4, 2005
    Date of Patent: May 20, 2008
    Assignee: E-Tech Corporation
    Inventors: Julius J. Stevens, William C. Edmundson, Ronald E. Murray, Craig G. Young