Using Single Unidirectional Element With Bidirectional Pass Patents (Class 323/324)
  • Patent number: 11116057
    Abstract: A light-emitting diode (LED) luminaire control system comprising a control circuit is adopted to provide remote control signals to operate an external luminaire that comprises LED arrays and a power supply. The LED luminaire control system further comprises a relay switch, a remote controller, and a transceiver circuit. When the remote control signals are initiated by the remote controller with phase-shift keying (PSK) signals transmitted, the transceiver circuit can demodulate such PSK signals and subsequently send decoded commands to the LED luminaire control system to control the luminaire by turning on and off and dimming up and down the external luminaire.
    Type: Grant
    Filed: July 15, 2020
    Date of Patent: September 7, 2021
    Assignee: Aleddra Inc.
    Inventor: Chungho Hsia
  • Patent number: 10274530
    Abstract: A ground fault detector includes a relay configured to receive a first current. The ground fault detector also includes a voltage regulator configured to provide a voltage potential to ground. The ground fault detector further includes an amplifier configured, in response to a ground current flowing into or out of the ground fault detector, to change an output voltage of the amplifier in order to cause a change in the first current received at the relay. The change in the first current is indicative of a ground fault. Upon detection of a ground fault, the ground fault detector can be isolated from ground.
    Type: Grant
    Filed: July 22, 2015
    Date of Patent: April 30, 2019
    Assignee: Honeywell International Inc.
    Inventors: Adrianus Cornelis Maria Hamers, Erik Wormmeester
  • Patent number: 9670933
    Abstract: A compressor control apparatus, and a refrigerator including the same are provided. The operation of two compressors may be controlled using an alternating current (AC) switch, thereby minimizing a number of components, as well as increasing compressor capacity and enhancing operation efficiency. A plurality of operation modes may be used to correspond to a load or freezing capacity using two compressors, and the two compressors may be operated in a separate or simultaneous manner using a drive including two (AC) switches, thereby simplifying the configuration of the system.
    Type: Grant
    Filed: January 29, 2013
    Date of Patent: June 6, 2017
    Assignee: LG ELECTRONICS INC.
    Inventors: Jaeyoo Yoo, Gyunam Kim, Boram Lee
  • Patent number: 9591725
    Abstract: The invention relates to a light emitting device system (112) comprising power supply terminals (114) and a remote control signal receiver (118), the power supply terminals being adapted for receiving electrical power from an external driver (100), the remote control signal receiver (118) being adapted for receiving a remote control signal, wherein the light emitting device system (112) is further adapted for providing the received remote control signal as remote control signal information exclusively via the power supply terminals (114) and/or via wireless transmission to the driver (100).
    Type: Grant
    Filed: March 15, 2010
    Date of Patent: March 7, 2017
    Assignee: PHILIPS LIGHTING HOLDING B.V.
    Inventor: Harald Josef G√ľnther Radermacher
  • Patent number: 9310415
    Abstract: A test system for plug-in connectors, especially for plug-in connectors in an airplane. A transmitting device which is designed for sending out a test signal to the plug-in connectors to be tested, and comprising at least one receiving device for each plug-in connector to be tested which is electrically coupled with the respective plug-in connector and which is designed for receiving the transmitted test signal and outputting an acknowledgement signal in response to receiving the transmitted test signal. Furthermore, the present invention creates an aircraft or a spacecraft and a method.
    Type: Grant
    Filed: January 7, 2013
    Date of Patent: April 12, 2016
    Assignee: AIRBUS OPERATIONS GmbH
    Inventor: Wolfram Henkel
  • Patent number: 9143009
    Abstract: Operating power (207 and/or 209) is wirelessly transmitted (101) within a movable barrier operator system (200) to at least one remote peripheral device (204) to thereby provide at least a portion of the remote peripheral device's instantaneous power consumption requirements. By these teachings, this remote peripheral device and the movable barrier operator for the movable barrier operator system are able to transmit information there between separate and apart from such wireless transmission of operating power. Such an exchange might comprise, for example, one or more separate wireless transmissions that are distinct and separate from the wireless power transmissions.
    Type: Grant
    Filed: February 1, 2007
    Date of Patent: September 22, 2015
    Assignee: The Chamberlain Group, Inc.
    Inventor: James J. Fitzgibbon
  • Patent number: 8922189
    Abstract: An apparatus for generating an output voltage from an input voltage is provided. The apparatus comprises a switch that receives the input voltage, an inductor that is coupled to the switch, a capacitor coupled to the inductor with the output voltage being output from a node between the inductor and the capacitor, a measuring circuit that receives and measures the input voltage, and a controller that is coupled to the switch and to the measuring circuit. Additionally, the controller receives the measured input voltage and calculates an on-time for the switch based on the measured input voltage and actuates the switch for the on-time.
    Type: Grant
    Filed: November 18, 2008
    Date of Patent: December 30, 2014
    Assignee: Texas Instruments Incorporated
    Inventors: Robert A. Neidorff, Bing Lu
  • Patent number: 8872433
    Abstract: An electronic control system for operating lighting is rated and operable from normal AC mains supply voltages. A street light controller is adapted to activate a luminaire when ambient light levels are considered too dark and, conversely, when ambient light levels are sufficient, the luminaire is turned off.
    Type: Grant
    Filed: March 20, 2013
    Date of Patent: October 28, 2014
    Assignee: Hendon Semiconductors Pty. Ltd.
    Inventors: Thi Bui, Mark Potter, Khanh Le, Stephen Francis
  • Patent number: 8081966
    Abstract: The RF circuit switching circuit includes N/2 first RF transfer switches connected to N input wirings, N/2 second RF transfer switches connected to N output wirings and N internal connection routes including internal wirings or a combination of a plurality of third RF transfer switches and a plurality of internal wirings. The RF transfer switches on the routes are switched to connect each of the N input RF circuits to each of the N output RF circuits through the route including the first and second RF transfer switch and the internal connection route.
    Type: Grant
    Filed: May 30, 2008
    Date of Patent: December 20, 2011
    Assignee: Fujitsu Limited
    Inventor: Sumito Nakazawa
  • Patent number: 7973519
    Abstract: A device for transforming an AC voltage to a lower AC voltage includes a generator of a PWM control signal and a first bidirectional switch to couple a load to the AC voltage during a conduction-phase. A second bidirectional switch discharges energy from the load during an off-phase of the first bidirectional switch. A first driving circuit of the first bidirectional switch is input with the PWM control signal and generates a first PWM signal, applied between control and conduction terminals of the first bidirectional switch. A second driving circuit for the second bidirectional switch is input with the PWM control signal and generates a second PWM signal, in phase opposition to the first PWM signal, applied between control and conduction terminals of the second bidirectional switch. An electric decoupling circuit is between the generator and second driving circuit. A transformer is between respective conduction terminals of the bidirectional switches.
    Type: Grant
    Filed: March 28, 2008
    Date of Patent: July 5, 2011
    Assignee: STMicroelectronics S.r.l.
    Inventors: Mario Di Guardo, Giovanni Mangraviti
  • Publication number: 20070273353
    Abstract: The present invention relates to a technique capable of reliably detecting supply voltages at a plurality of points in an integrated circuit with a simple arrangement and improving the setting accuracy of a supply voltage to the integrated circuit irrespective of position in the interior of the integrated circuit. The integrated circuit internally includes a plurality of voltage sense points, a selection circuit connected to each of the plurality of voltage sense points for selecting one of the plurality of voltage sense points on the basis of an input signal, and a voltage sense terminal connected to the selection circuit for outputting a voltage of the one voltage sense point, selected by the selection circuit, to the exterior of the integrated circuit.
    Type: Application
    Filed: September 14, 2006
    Publication date: November 29, 2007
    Applicant: Fujitsu Limited
    Inventor: Koji Okamoto
  • Patent number: 6841984
    Abstract: A system (150) for controlling voltage supplied to a transmission line system. System (150) includes a transmission cable (134) having a characteristic impedance and a load impedance connected at its distal end. A power source (154) is connected to transmission cable (134). Power source (154) is configured to receive a voltage signal input (157) and to drive a source voltage VS based thereon. A feedback unit (155) is configured to receive the power source current (IS) as an input and further configured to generate a feedback voltage (VF) that varies with IS. A set voltage unit (152) is configured to produce a substantially constant voltage (Vset) and an adder (153) is configured to add the set voltage (Vset) to the feedback voltage to generate the voltage signal (157) that provides the input to power source (154). The feedback unit (155) may include an impedance element (156) comprising a digital signal processor or other suitable circuit that models the short circuit impedance of the transmission line.
    Type: Grant
    Filed: January 9, 2003
    Date of Patent: January 11, 2005
    Assignee: Schlumberger Technology Corporation
    Inventor: Ramon Hernandez
  • Patent number: 6771056
    Abstract: A method for operating an alternating-current (AC) controller system includes providing a first bi-directional switch coupled to a load and an AC power source. The first bi-directional switch is a solid-state device. The first switch is turned on in a first half-cycle of an AC cycle. The first switch is turned off in the first half-cycle of the AC cycle.
    Type: Grant
    Filed: October 29, 2002
    Date of Patent: August 3, 2004
    Assignee: Ixys Corporation
    Inventor: Andreas Lindemann
  • Patent number: 6690150
    Abstract: A direct current supply voltage for controlling an electronic switch, for example a triac, is obtained from a residual voltage at the terminals of the switch when it is conducting. The electrical energy needed to produce an auxiliary power supply voltage is taken from the terminals of the electronic switch while it is conducting. The residual voltage is rectified and stepped up, for example using a regulated switch-mode power supply circuit as a rectifier/voltage step-up system.
    Type: Grant
    Filed: January 10, 2002
    Date of Patent: February 10, 2004
    Assignee: Legrand Legrand SNC
    Inventors: Laurence Pelletier, Alain Delaporte
  • Patent number: 6590349
    Abstract: A bidirectional switch, including a first bidirectional switch between two power terminals of the switch, a low-voltage storage element between a first power terminal and a control terminal of the switch, and a control stage adapted to cause, upon each halfwave beginning of an A.C. supply voltage applied between the power terminals and when the switch is on, the charge of the storage element with a biasing depending on the sign of the halfwave.
    Type: Grant
    Filed: June 12, 2001
    Date of Patent: July 8, 2003
    Assignee: STMicroelectronics S.A.
    Inventor: Laurent Moindron
  • Patent number: 6548983
    Abstract: A power modulation control system using PWM pulses is provided. The system comprises an AC voltage generator, an electric load, and a control circuit incorporating at least one rectifier. The electric load is connected between the generator and the rectifier, and first and second monodirectional switches are connected in parallel with the load.
    Type: Grant
    Filed: June 11, 2001
    Date of Patent: April 15, 2003
    Assignee: STMicroelectronics S.r.l.
    Inventors: Leonardo Dino Avella, Giuseppe Palma, Antonino Cuce'
  • Patent number: 6522119
    Abstract: A system (150) for controlling voltage supplied to a transmission line system. System (150) includes a transmission cable (134) having a characteristic impedance and a load impedance connected at its distal end. A power source (154) is connected to transmission cable (134). Power source (154) is configured to receive a voltage signal input (157) and to drive a source voltage VS based thereon. A feedback unit (155) is configured to receive the power source current (IS) as an input and further configured to generate a feedback voltage (VF) that varies with IS. A set voltage unit (152) is configured to produce a substantially constant voltage (Vset) and an adder (153) is configured to add the set voltage (Vset) to the feedback voltage to generate the voltage signal (157) that provides the input to power source (154). The feedback unit (155) may include an impedance element (156) comprising a digital signal processor or other suitable circuit that models the short circuit impedance of the transmission line.
    Type: Grant
    Filed: September 11, 2001
    Date of Patent: February 18, 2003
    Assignee: Schlumberger Technology Corporation
    Inventor: Ramon Hernandez
  • Publication number: 20020113584
    Abstract: A direct current supply voltage for controlling an electronic switch, for example a triac, is obtained from a residual voltage at the terminals of the switch when it is conducting. The electrical energy needed to produce an auxiliary power supply voltage is taken from the terminals of the electronic switch while it is conducting. The residual voltage is rectified and stepped up, for example using a regulated switch-mode power supply circuit as a rectifier/voltage step-up system.
    Type: Application
    Filed: January 10, 2002
    Publication date: August 22, 2002
    Inventors: Laurence Pelletier, Alain Delaporte
  • Patent number: 6281669
    Abstract: In a circuit arrangement for limiting peak current, an inverter provides at an AC voltage output a series circuit of a consumer and a rectifier unit connected across the output. A current limiter connects across output terminals of the rectifier unit. The current limiter has first and second terminals, a series circuit formed of a measuring shunt and a switching element being connected across the first and second terminals. A control input of the switching element is connected to an output of a current regulator. First and second input terminals of the current regulator connect to both sides of the measuring shunt. The current regulator is designed to control a switching element such that when a current maximum representing a peak current flows, a height of the peak current is limited to a desired maximum current value determined primarily by a potential across said measuring shunt.
    Type: Grant
    Filed: March 2, 2000
    Date of Patent: August 28, 2001
    Assignee: Siemens Aktiengesellschaft
    Inventor: Bogdan Brakus
  • Patent number: 6271653
    Abstract: An arrangement provides a power supply for low voltage circuits that is connected to receive and store energy from a power electronics switch that is connected to an alternating current supply. The power supply is operative over a wide range of input and regardless of the operating status of the power electronics switch. For each half cycle of the alternating current which the power electronic switch is to be rendered conductive, the arrangement delays for a predetermined time duration the control of the power electronic switch at the zero crossing of the half cycle. During the predetermined time duration, the power supply charges an energy storage device with sufficient energy to supply the low voltage circuit until the next half cycle.
    Type: Grant
    Filed: April 24, 2000
    Date of Patent: August 7, 2001
    Assignee: S & C Electric Company
    Inventors: Gregory C. Mears, Todd W. Klippel
  • Patent number: 6208126
    Abstract: A circuit is provided for supplying a load from an AC voltage supply. The circuit includes a control circuit and a bidirectional switch coupled in series with the load. The bidirectional switch includes two one-way switches connected in antiparallel, and the control circuit controls the bidirectional switch based on a relatively low DC voltage. The bidirectional switch is connected to a first terminal of the AC voltage supply, and the DC voltage is referenced to the first terminal of the AC voltage supply. Additionally, an apparatus connected to an AC voltage supply and a relatively low DC voltage is provided. The apparatus includes a control circuit, a load to be supplied by the AC voltage supply, and a bidirectional switch coupled in series with the load. The bidirectional switch includes two one-way switches connected in antiparallel, and the control circuit controls the bidirectional switch based on the DC voltage.
    Type: Grant
    Filed: November 22, 1999
    Date of Patent: March 27, 2001
    Assignee: STMicroelectronics S.A.
    Inventor: Laurent Gonthier
  • Patent number: 6072304
    Abstract: An improved trigger circuitry for a high side thyristor application having a thyristor connected to an A/C line, a capacitor connected across the A/C line to A/C neutral through impedance, an electronic switch connected from the thyristor to the junction of the capacitor and associate impedance. During the positive portion of the A/C cycle, the thyristor is triggered in quadrant III via the switch and the capacitor is charged. During the negative portion of the A/C cycle, the discharge of the capacitor triggers quadrant II of the thyristor via the switch.
    Type: Grant
    Filed: July 21, 1999
    Date of Patent: June 6, 2000
    Assignee: Regent Lighting Corporation
    Inventor: Jeff Duve
  • Patent number: 5953221
    Abstract: A multi-range power supply unit with an automatic switchover between ranges for different power supply voltages is disclosed for use with devices such as circuit breakers or contact systems. The power supply unit preferably has only two input connections for an input voltage range of approximately 20V-230V. Between the two input connections there is a rectifier circuit with a voltage stabilizing element, such as a Z-diode or equivalent device, connected in parallel. Connected in series to the rectifier circuit is a current divider. The current divider includes a capacitance and a thermistor. The thermistor preferably has a positive temperature coefficient (PTC). The power supply unit can be used for a power supply with DC voltage and for a power supply with AC voltage.
    Type: Grant
    Filed: October 23, 1997
    Date of Patent: September 14, 1999
    Assignee: Klockner Moeller GmbH
    Inventors: Torsten Kuhn, Ralph Arnold
  • Patent number: 5852357
    Abstract: A system for controlling an Alternating Current (AC) signal to an AC powered device. The system uses a microcontroller to monitor the cycles of the AC signal supplied to the AC powered device. By utilizing cycle counting, the microcontroller can supply various numbers of waveforms to the AC powered device in order to adjust the speed and/or energy supply level to the AC powered device. At full power, all the cycles of the AC signal are provided to the AC powered device. If the speed and/or energy supply level of the AC powered device needs to be reduced by half, the microcontroller supplies every other cycle of the AC signal to the AC powered device.
    Type: Grant
    Filed: December 5, 1996
    Date of Patent: December 22, 1998
    Assignee: Microchip Technology Incorporated
    Inventor: Stanley A. D'Souza
  • Patent number: 5714861
    Abstract: A power tool has a variable speed control circuit that comprises a user switch, a motor and a silicon controlled rectifier (SCR) connected in series between a pair of power supply terminals. A manually variable resistor is connected between a first electrode of the SCR and a circuit node. A capacitor is coupled between the circuit node and a second SCR electrode. A bleed-off resistor is connected between second electrode of the SCR and the circuit node to provide a path for discharging the capacitor when the user switch is open. A zener diode couples the circuit node to the SCR gate electrode. The circuit configuration ensures that the capacitor charges from substantially the same voltage level at the start of each half-cycle during which the SCR is to be turned on.
    Type: Grant
    Filed: March 28, 1996
    Date of Patent: February 3, 1998
    Assignee: Eaton Corporation
    Inventors: James Edward Hansen, Jeffery L. Henderson, Nathanael Sommer
  • Patent number: 5635827
    Abstract: A power control system in a DIN rail mount assembly for switching power in a low cost, compact, and solid state for controlling electric heaters. The system can be used for single phase, three phase-two leg, and three phase-three leg. Current switching capabilities range from 30A to 50A. Variable time base, 4-20 mA process control or VAC/DC input contactor configurations can be utilized. The DIN Rail back plate includes a sliding mechanical configuration. A potting fence provides for potting of the electrical substrate and also provides a heat sink. A large cover covers finger palm safer terminals. The DIN rail assembly can also be used for supporting electrical, electromechanical, optical or other types of assemblies.
    Type: Grant
    Filed: August 6, 1996
    Date of Patent: June 3, 1997
    Assignee: Watlow Electric Manufacturing Company
    Inventors: Robert A. Judd, Lawrence A. Crane
  • Patent number: 5576614
    Abstract: A circuit is provided for obtaining precise lamp voltage control and for compensating for varying or fluctuating input from an AC voltage source. The lamp is switched on by a switching device such as a triac. When the triac is powered, a simultaneous powering occurs of a second switching device such as an SCR. The SCR produces a scaled down RMS voltage output which closely matches the actual RMS lamp voltage. This second simulated voltage is precisely controlled in a feedback circuit which includes an RMS to DC converter and a feedback controller. The controller compares a converted DC voltage with a reference voltage and generates a firing pulse to the triac which is advanced or delayed so as to compensate for variations in the AC source as manifested by variations in the converted DC signal relative to the reference signal.
    Type: Grant
    Filed: May 27, 1994
    Date of Patent: November 19, 1996
    Assignee: Xerox Corporation
    Inventors: David J. Meads, Keith L. Bedford, Robert Kennedy, Clive R. Harris
  • Patent number: 5530748
    Abstract: A power supplying system is adapted to a subscriber terminating equipment that supplies power to a subscriber terminal equipment based on a supply of power from an external power supply part. The power supplying system includes an excess current limiting circuit stopping a supply of power within the subscriber terminating equipment when an excess current is generated in the supply of power from the external power supplying part, and an excess current detection circuit detecting an excess current state.
    Type: Grant
    Filed: July 13, 1994
    Date of Patent: June 25, 1996
    Assignee: Fujitsu Limited
    Inventor: Hisakazu Ohmori
  • Patent number: 5519311
    Abstract: A control system is provided for controlling the average power from an alternating voltage source (AC) to a load having inductive properties. The system uses a synchronous switch shunted by a capacitor connected between the source (generator) and sink (load) to pulse duration modulate the AC voltage carrier wave. A control signal generator circuit drives the synchronous switch such that the switch is closed at a variable time early in each half-wave of the AC voltage source carrier wave and such that the switch is opened at a subsequent later, variable time during that half-wave. This is accomplished by sensing the voltage across the synchronous switch in order to inhibit closing of the switch early in the half-wave until the synchronous switch voltage (and thus the voltage on the capacitor) is substantially zero and then opening the synchronous switch at a point in time to give the desired volt-second area between closure and opening within each half-wave.
    Type: Grant
    Filed: January 19, 1984
    Date of Patent: May 21, 1996
    Assignee: Don Widmayer & Associates, Inc.
    Inventor: Don F. Widmayer
  • Patent number: 5512810
    Abstract: A power tool has a variable speed control circuit that comprises a user switch, a motor and a thyristor connected in series between a pair of power supply terminals. A manually variable resistor is connected between a first electrode of the thyristor and a circuit node. A capacitor is coupled between the circuit node and the second thyristor electrode. A bleed-off resistor is connected between second thyristor electrode and the circuit node to provide a path for discharging the capacitor when the user switch is open. A semiconductor trigger device, such as a diac or silicon trigger switch, couples the circuit node to the thyristor gate electrode. The circuit operation ensures that the capacitor charges from substantially the same voltage level at the start of each half-cycle during which the thyristor is to be turned on.
    Type: Grant
    Filed: May 27, 1994
    Date of Patent: April 30, 1996
    Assignee: Eaton Corporation
    Inventors: James E. Hansen, Jeffery L. Henderson, James R. Jaeschke
  • Patent number: 5406191
    Abstract: Procedure and apparatus for the control of electric power, by which procedure the electric power supplied to a load is regulated by means of a regulator, e.g. a thyristor regulator. The regulator control signals, e.g. thyristor firing pulses, are produced by a separate control unit (6), from where they are passed in the form of optical signals via at least one optical fibre (2) to a socket or equivalent and further to a photosensitive device (Q), which converts the signals into electrical form and applies them to at least one controllable solid-state component, e.g. thyristor, in the power stage of the regulator.
    Type: Grant
    Filed: December 27, 1993
    Date of Patent: April 11, 1995
    Assignee: Smart Set Oy
    Inventor: Olli Salo
  • Patent number: 5365162
    Abstract: An electric bulb saver is provided for use with light bulb sockets in either 110 V or 220 V screw type or bayonet circuits. The device includes circuitry comprising a resistor, a capacitor and a rectifier. The circuitry may also include in specified combinations, thermistors, a bridge rectifier, as well as additional resistors, capacitors, and rectifiers. The circuit may be housed in a socket, wall switch or plug, in an on-line connection, or in a device attached to the socket.
    Type: Grant
    Filed: July 8, 1992
    Date of Patent: November 15, 1994
    Inventor: Shaam P. Sundhar
  • Patent number: 5345166
    Abstract: Detector comprising a sensor and a processing circuit connected to a load by means of two wires. Two switches (I1, I2) are arranged in series in a switching circuit leg (21), the ends of which (C, D) are connected to the detector terminals and the middle point (S) to a terminal (F) of the processing circuit. When operating (I1) is conductive and (I2) determines a parallel regulation of the voltage (V) at the processing circuit (12) terminals ; when in rest position, (I1) determines a series regulation of the voltage while (I2) is blocked.
    Type: Grant
    Filed: June 18, 1992
    Date of Patent: September 6, 1994
    Assignee: Telemecanioue
    Inventors: Didier Leonard, Pierre Charrier
  • Patent number: 5327047
    Abstract: A dimmer control system includes two discrete silicon controlled rectifiers which respectively energize a lamp load during alternate half cycles of the input AC voltage. The separate placement of the SCRs ensures that much lower temperatures are reached than would occur if a single triac were used to energize a lamp during both half cycles. The system also includes a pair of diacs which energize the respective SCRs when a respective capacitor directly connected to each diac discharges through one of them. The system further includes a respective capacitor charging circuit for each capacitor, each of the two charge circuits including a series connections of the gate to cathode junction of the SCR other than the one which the capacitor being charged discharges through, a diode, a common fixed resistor, and a common variable resistor.
    Type: Grant
    Filed: September 30, 1992
    Date of Patent: July 5, 1994
    Assignee: Leviton Manufacturing Co., Inc.
    Inventor: Bernard Gershen
  • Patent number: 5309084
    Abstract: The present invention provides a electronic switch suitable for fading on/off control of electrical equipment like lamps and motors. The main circuit comprises a rectifier bridge circuit and a thyristor. A control circuit includes a fast discharging synchronic integrator and a trigger pulse integrator, the former acts as a pulse phase shifter to provide a self-adapting magnitude variable sawtooth waveform, while the latter acts as a dynamic phase variation memory so as to provide a variable reference for comparison. Trigger pulses which are feed back via the main circuit causes the synchronic integrator to fast discharge. If a control switch is closed, the voltage on the integral capacitor and the trigger angle decreases gradually to produce the fade on. In the fade off process, the conditions are just the opposite. Fading on/off time can be independently set.
    Type: Grant
    Filed: July 2, 1992
    Date of Patent: May 3, 1994
    Inventor: Zigang Jiang
  • Patent number: 5294839
    Abstract: A soft start tool handle trigger switch circuit (10) applies voltage from an AC source (12) to a portable tool electric motor (10). A current limiter (30) is connected in series between the AC source (12) and motor (14). A first sub-circuit (32) is connected in parallel with the motor (14) and includes actuator circuitry (34) tripping an actuator solenoid (36). A second sub-circuit (40) is connected in parallel with the current limiter (30) and has a pair of contacts (44, 46) actuated from an open condition to a closed condition upon movement of an actuator plunger (38). An NTC thermistor (48) is connected in series with the actuator circuitry and is physically proximate and heated by heat from the current limiter (30) to reduce the resistance of the NTC thermistor (48) and supply increased current to the actuator circuit (34) for earlier closing of the bypass sub-circuit (40), to stop the current-induced heating of the current limiter (30).
    Type: Grant
    Filed: June 29, 1992
    Date of Patent: March 15, 1994
    Assignee: Eaton Corporation
    Inventor: James R. Jaeschke
  • Patent number: 5247242
    Abstract: An output module which is used in a factory automation control apparatus is disclosed. The output module is connectable to both of AC and DC power sources, which is constituted by a control element controlled by the output signal in the factory automation control apparatus, and a drive element being bi-directionally conducted by the signal of the factory automation control apparatus. A first embodiment uses a full wave rectifier to rectify the current from/to the load, and a second embodiment uses two opposite channel type transistors to respectively conduct during different polarities.
    Type: Grant
    Filed: February 19, 1992
    Date of Patent: September 21, 1993
    Assignees: Toshiba Kikai Kabushiki Kaisha, Shibaki Controls, Inc.
    Inventors: Yutaka Yamaguchi, Toshihide Iinuma
  • Patent number: 5237264
    Abstract: A remotely controllable power control system wherein the power supplied to a load may be varied locally via an actuator, positionable through a continuous range, on a wall control or from a remote location using a remote control device not electrically wired to the wall control. The load control system includes a transmitter and a wall control/receiver, each having a control actuator for adjusting the power supplied to the load. Control can be obtained by either the transmitter or the wall control/receiver immediately upon manipulation of either control actuator, with the adjustment in power level occurring substantially instantaneously. Communication between the transmitter and the wall control/receiver is by digitally encoded infrared signal.
    Type: Grant
    Filed: July 26, 1991
    Date of Patent: August 17, 1993
    Assignee: Lutron Electronics Co., Inc.
    Inventors: Robin Moseley, Joel S. Spira, Arjuna Karunaratne, John Wylie, Jonathan A. Barney
  • Patent number: 5208516
    Abstract: A light socket for engaging and energizing a light bulb is adapted for attachment to a lamp base or other light fixture and has an internal chamber in which a touch responsive control circuit is disposed. The circuit has a solid state switch element which transmits voltage to the bulb in response to a change of capacitance at an input terminal and which preferably progressively changes light output in response to successive changes of capacitance. Heat damage to the solid state switch element is avoided, enabling use of higher wattage light bulbs, by a heat sink member which extends from the switch element to a location at which it contacts the lamp or other light fixture. In the preferred form, the heat sink is electrically connected to the control circuit input terminal and, in conjunction with metallic portions of the lamp or other light fixture, further functions as a component of the touch sensing system.
    Type: Grant
    Filed: June 24, 1991
    Date of Patent: May 4, 1993
    Inventor: Jacob Saidian
  • Patent number: 5179324
    Abstract: A dimmer with reduced filtering losses is connected into a conductor supplying power to a load from a mains power supply. It conventionally comprises a triac in series with a filter inductor between an input terminal and an output terminal and a circuit generating triggering signals for the triac. To reduce the losses in the inductor, which conventionally is in series with the load at all times but is active only during moments following triggering of the triac, to reduce the amplitude of the transient currents, a second triac triggered by a circuit with a time-delay greater than the time constant defined by the filter capacitor and inductor diverts the load current. An auxiliary low-value inductor attenuates transients due to triggering of the second triac.
    Type: Grant
    Filed: January 21, 1992
    Date of Patent: January 12, 1993
    Assignee: Legrand
    Inventor: Jean Audbert
  • Patent number: 5146153
    Abstract: A remote wireless load control system wherein the power supplied to a load can be varied from a remote location using a remote control device not electrically wired to the load. The load control system includes a transmitter and a receiver, each having a control actuator for adjusting the power supplied to the load. Control can be conferred upon either the transmitter or the receiver immediately upon manipulation of the control switch, with the adjustment in power level occurring substantially instantaneously upon manipulation of the control actuator. Transmission of load level information between transmitter and receiver is by digitally pulse-coded infrared signal.
    Type: Grant
    Filed: November 1, 1989
    Date of Patent: September 8, 1992
    Inventors: David G. Luchaco, Stephen J. Yuhasz, David Buehler, Raphael K. T. Tang, Joel S. Spira
  • Patent number: 5140255
    Abstract: A controller associated with a dissipative electric load controls the level of average power applied to the load by an electric energy distribution network that supplies the dissipative load with a supply voltage. The controller comprises a detector for detecting a predetermined pulse duration modulation signal embedded in the level of the supply voltage provided by the distribution network, and a device for transmitting electric power originating from the distribution network to the load. The device for transmitting comprises a device for reducing the level of average power transmitted to the load, in response to a detection of said pulse duration modulation signal in the level of supply voltage. A decrease of the line voltage level for a given duration of power distribution voltage is initiated in order to control the average power consumption of the loads.
    Type: Grant
    Filed: April 26, 1991
    Date of Patent: August 18, 1992
    Inventors: Don Tardio, David Bensoussan
  • Patent number: 5099193
    Abstract: A remotely controllable power control system wherein the power supplied to a load may be varied locally via an actuator, positionable through a continuous range, on a wall control or from a remote location using a remote control device not electrically wired to the wall control. The load control system includes a transmitter and a wall control/receiver, each having a control actuator for adjusting the power supplied to the load. Control can be obtained by either the transmitter or the wall control/receiver immediately upon manipulation of either control actuator, with the adjustment in power level occurring substantially instantaneously. Communication between the transmitter and the wall control/receiver is by digitally encoded infrared signal.
    Type: Grant
    Filed: March 31, 1989
    Date of Patent: March 24, 1992
    Assignee: Lutron Electronics Co., Inc.
    Inventors: Robin Moseley, Joel S. Spira, Arjuna Karunaratne, John Wylie, Jonathan A. Barney
  • Patent number: 5081411
    Abstract: An apparatus and method is disclosed for controlling a load capable of functioning for a predetermined purpose in response to a predetermined amount of electrical power. The load can be operated from either an AC or DC source using a two-wire connection. The predetermined amount of electrical power is applied to the load if a sensor senses a triggering event. During the time period when a triggering event is sensed, power is cycled on and off to the load in order to enable continuous monitoring of the trigger event. During most of the time period, the sensor receives power to maintain its operations from a storage circuit. If the charge in a capacitor decreases to a predetermined value, the predetermined amount of electrical power is removed from the load momentarily to allow replenishment of the capacitor charge.
    Type: Grant
    Filed: December 20, 1990
    Date of Patent: January 14, 1992
    Assignee: Honeywell Inc.
    Inventor: James M. Walker
  • Patent number: 5032782
    Abstract: A full-bridge transistor inverter is connected at its DC supply-side with an energy-storing capacitor. The inverter's output terminals are connected in series between a source of AC voltage and a load; which load may be an electric motor, a fluorescent lighting system, etc. By controllably switching the transistors of the inverter ON and OFF at some rate higher than, but basically synchronous with, the frequency of the AC voltage, effective control of the flow of power between the AC source and the load is achieved. DC voltage on the energy-storing capacitor is obtained from the AC source and established by way of the timing of the switching action of the inverter.
    Type: Grant
    Filed: October 10, 1989
    Date of Patent: July 16, 1991
    Inventor: Ole K. Nilssen
  • Patent number: 4965508
    Abstract: A load is supplied by a transformer supplied via a voltage regulator and thyristor network. The thyristor network and regulator are simultaneously controlled to respond to changes in the load and in practice the thryistors respond rapidly and are re-adjusted as the regulator is inherently more slowly adjusted. The result is that the thyristors produce minimum reflected harmonics overall in the mains and an optimum power factor can be achieved for each power setting.
    Type: Grant
    Filed: March 23, 1989
    Date of Patent: October 23, 1990
    Assignee: APV UK Limited
    Inventor: Basil Soan
  • Patent number: 4954768
    Abstract: A low voltage two wire dimming circuit comprises a voltage compensating circuit for regulating the RMS value of an AC voltage applied to a load and a correcting circuit for eliminating damaging DC current that may flow through the load. The voltage compensating circuit adjusts the firing angle of an electronic switch disposed in the dimming circuit to compensate for fluctuations in the AC supply voltage. The correcting circuit advances or retards the firing angle during selected half cycles to correct for asymmetries in the AC load voltage waveform caused by excessive DC current. According to the invention, there is also provided a two wire low voltage dimming circuit without voltage compensation but having improved dimming ability at low load currents and improved resistance to the flow of damaging DC currents.
    Type: Grant
    Filed: May 26, 1989
    Date of Patent: September 4, 1990
    Assignee: Lutron Electronics Co., Inc.
    Inventors: David G. Luchaco, Charles C. Houng
  • Patent number: 4948987
    Abstract: Voltage drop developed across a transformer primary winding coupled in series with a primary a.c. power circuit including an a.c. power source and an a.c. load is utilized to provide a secondary source of a.c. power having secondary voltage level stability which is substantially independent from otherwise influential changes in primary power circuit levels. Secondary power stabilization is mainly established by constant voltage limiting of the primary winding excitation by the forward voltage drop developed across an arrangement of semiconductor junctions coupled in parallel with the primary winding. The transformer may be used to change the source level of the secondary a.c. power which is produced, and to obtain electrical isolation between the primary power circuit and any ancillary circuits coupled with the secondary a.c. power source.
    Type: Grant
    Filed: February 21, 1989
    Date of Patent: August 14, 1990
    Inventor: Harold J. Weber
  • Patent number: 4914327
    Abstract: A circuit for controlling an AC current through a load. The load, e.g. a motor (3), is connected in series with a first triac (7) between two terminals (1, 2) adapted for connection to an AC supply voltage. A series circuit of a capacitor (6) and a parallel circuit consisting of a first (14) and a second (5) resistor is connected parallel to the first triac. The control electrode of the first triac is connected to the capacitor by means of a series circuit of a third resistor (9) and a second triac (10). A control electrode of the second triac is connected to the capacitor by means of a diac (8).
    Type: Grant
    Filed: November 1, 1988
    Date of Patent: April 3, 1990
    Assignee: U.S. Philips Corporation
    Inventor: Jan H. Dekker
  • Patent number: 4878010
    Abstract: A.c. line operated controller which provides solid-state switching of a.c. power flow, together with producing a supplementary source of low d.c. power for operation ancillary circuits. Operation is obtained through electrical connection that is in series with only one side of the a.c. power circuit. Device utilizes a thyristor for a.c. power switch control. A small residual potential which is devised to appear across the ON-state thyristor is rectified to produce the low d.c. power level. When the thyristor is OFF, the line voltage potential across the thyristor is reduced and rectified to produce the low d.c. power level. Turning the thyristor OFF is attained by current starving of the thyristor gate electrode by a gate shunting semiconductor switch. Device is shown to be utilized in "two terminal" apparatus producing time delayed switching of a light, as a controller for producing the illusion of a flickering flame from an ordinary light bulb, as a light flasher, and as a "touch-controlled" a.c.
    Type: Grant
    Filed: December 10, 1987
    Date of Patent: October 31, 1989
    Inventor: Harold J. Weber