Discharge Control Discharge Device In The Control Circuit Patents (Class 315/199)
  • Patent number: 9686842
    Abstract: A system and method for discovering at least one dimming control protocol installed in a plurality of lighting devices and for controlling a plurality of dimming levels of the plurality of lighting devices are disclosed. The system may include at least one gateway that connects to at least one plurality of luminaires and/or LED's, at least one sensor subsystem and at least one power meter. The system and method may exchange information between a plurality of light devices and a self-organized, self-discovering gateway device. The gateway may use one or more known control protocols as an input and is able to handle multiple light devices that support different control protocols. This ability makes the gateway a universal lighting control gateway.
    Type: Grant
    Filed: November 4, 2016
    Date of Patent: June 20, 2017
    Assignee: Gooee Limited
    Inventors: Simon Coombes, Jonathan Couch, Andrew Johnson, Shmuel Silverman
  • Patent number: 9674906
    Abstract: A dimmer switch for an LED light source utilizes a thyristor-type device (“TTD”) having a first terminal, a second terminal, and a gate terminal. A low-voltage power supply converts alternating voltage into a direct voltage and is connected in parallel with the TTD. Gate current supplying circuitry is provided to supply current to the gate of the TTD, the gate current supplying circuitry powered by the low-voltage power supply and including a variable input device operable to vary a voltage waveform at the gate of the TTD in order to vary a voltage waveform provided at the second terminal.
    Type: Grant
    Filed: January 26, 2016
    Date of Patent: June 6, 2017
    Assignee: Lily Digital LLP
    Inventor: Anthony Doyle
  • Patent number: 9572220
    Abstract: Disclosed are an LED lighting apparatus and a control circuit thereof which controls illumination of a lamp including LEDs using a dimmer. The LED lighting apparatus includes a flicker control unit which provides a control signal corresponding to a rectified voltage having a low angle corresponding to a preset low angle region and equal to or less than a preset level or detects an initial abnormal waveform diagram of the rectified voltage and provides a control signal corresponding to the abnormal waveform period, and controls a current path for light emission of the lamp.
    Type: Grant
    Filed: June 25, 2014
    Date of Patent: February 14, 2017
    Assignee: SILICON WORKS CO., LTD.
    Inventors: Yong Goo Kim, Won Ji Lee, Kyung Min Kim, Jong Min Lee, Min Soo Kim, Young Suk Son
  • Patent number: 9537436
    Abstract: Disclosed is an alternator overvoltage protection circuit having a TRIAC and a MOSFET. The TRIAC is electrically connected to the MOSFET and the TRIAC is electrically connected to a magneto. The TRIAC is configured to ground the magneto when triggered by the MOSFET. The MOSFET is electrically connected to an alternator and configured to conduct when the alternator operates in an overvoltage condition. Also disclosed is a method of alternator overvoltage protection for a piece of outdoor power equipment, the method including providing a TRIAC and an alternator rotated by an engine having a magneto, wherein the alternator outputs a voltage when rotated by the engine. The method further includes configuring the TRIAC to ground the magneto when the alternator operates in an overvoltage condition, thereby disabling the magneto, which stops the rotation of the engine and stops the alternator from outputting voltage.
    Type: Grant
    Filed: October 16, 2015
    Date of Patent: January 3, 2017
    Assignee: MTD Products Inc
    Inventor: Maynard S. Guadiz
  • Patent number: 9538617
    Abstract: A system of network-connected lighting devices also offers a distributed processing function that utilizes processor and/or memory resources if/when available in some or all of the lighting devices. In the examples, a resource manager receives a job for distributed processing using shared available resources. The resource manager identifies lighting devices having resources of the processors and/or the memories available for the distributed processing function. The resource manager distributes tasks and/or data of the received job through a communications network to identified lighting devices, for distributed processing. The resource manager also receives results of distributed processing for the received job, from the identified lighting devices through the communications network. The received results are processed to produce a composite result for a response to the received job.
    Type: Grant
    Filed: September 8, 2015
    Date of Patent: January 3, 2017
    Assignee: ABL IP HOLDING LLC
    Inventors: Jack C. Rains, Jr., David P. Ramer, Jason Rogers
  • Patent number: 9491821
    Abstract: AC LED light engines powered directly from the AC power line contain circuitry of resistors, capacitors, diodes and transistors which enables a single string LEDs connected to series to efficiently produce light with a relatively low level of flicker as perceived by the human eye. The LEDs are driven by a current which is alternately capacitively-limited and resistively-limited. Capacitively-limited pulses of current are interposed between resistively-limited pulses of current so that the resulting output current ripple is at frequencies of 240 Hz or above which the human eye cannot perceive. The combination of resistively-limited current and capacitively-limited current results in a current drain from the power line which is generally sinusoidal and can have a power factor in excess of 0.70.
    Type: Grant
    Filed: January 13, 2015
    Date of Patent: November 8, 2016
    Inventor: Peter W. Shackle
  • Patent number: 9490801
    Abstract: A rapid cutoff device includes a thyristor AC switch for supplying an AC current from a first AC circuit to a second AC circuit. A serially-connected circuit of a first switch and a first capacitor parallel-connects with the first AC circuit. A serially-connected circuit of a second switch and a second capacitor parallel-connects with the second AC circuit. When cutting off the thyristor AC switch, the first switch is operated to conduct the first capacitor in a first direction for the AC current charging to the first capacitor, alternatively, the second switch is operated to conduct the second capacitor in a second direction for the AC current charging to the second capacitor, thereby lowering a current in the thyristor AC switch approaching a zero value and thus rapidly cutting off it.
    Type: Grant
    Filed: December 31, 2014
    Date of Patent: November 8, 2016
    Assignee: Ablerex Electronics Co., Ltd.
    Inventors: Jia-Min Shen, Yi-Hao Chang, Chia-Hung Lee
  • Patent number: 9468077
    Abstract: A lighting control system includes a master unit and a plurality of slave units. The slave units are respectively designed to consume power by operating lighting means, are supplied by a common power supply unit, can be provided with commands from the master unit, and are respectively provided with a control unit which modulates the power consumption of the associated slave unit according to a defined protocol. The master unit is designed to measure the power consumed by all slave units.
    Type: Grant
    Filed: March 19, 2015
    Date of Patent: October 11, 2016
    Assignee: TRIDONIC GMBH & CO KG
    Inventors: Giulio Borsoi, Abhinav Somaraju
  • Patent number: 8987994
    Abstract: A load control device (such as, a dimmer switch) for controlling the amount of power delivered from an AC power source to an electrical load (such as, a high-efficiency lighting load) includes a thyristor coupled between the source and the load, a gate coupling circuit coupled to the gate of the thyristor, a control circuit, and an RF receiver for receiving an RF signal. The control circuit causes the gate coupling circuit to conduct a gate current to render the thyristor conductive at a firing time during a half cycle of the AC power source, and allows the gate coupling circuit to conduct the gate current at any time from the firing time through approximately the remainder of the half cycle. The thyristor is able to remain conductive independent of the magnitude of a load current conducted through the thyristor and to conduct the load current to and from the electrical load during a single half-cycle.
    Type: Grant
    Filed: December 17, 2013
    Date of Patent: March 24, 2015
    Assignee: Lutron Electronics Co., Ltd.
    Inventor: Robert C. Newman, Jr.
  • Patent number: 8841849
    Abstract: A two-wire load control device (such as, a dimmer switch) for controlling the amount of power delivered from an AC power source to an electrical load (such as, a high-efficiency lighting load) includes a thyristor coupled between the source and the load, a gate coupling circuit coupled between a first main load terminal and the gate of the thyristor, and a control circuit coupled to a control input of the gate coupling circuit. The control circuit generates a drive voltage for causing the gate coupling circuit to conduct a gate current to thus render the thyristor conductive at a firing time during a half cycle of the AC power source, and to allow the gate coupling circuit to conduct the gate current at any time from the firing time through approximately the remainder of the half cycle, where the gate coupling circuit conducts approximately no net average current to render and maintain the thyristor conductive.
    Type: Grant
    Filed: August 6, 2013
    Date of Patent: September 23, 2014
    Assignee: Lutron Electronics Co., Inc.
    Inventor: Robert C. Newman, Jr.
  • Patent number: 8754582
    Abstract: A detector circuit for actuating at least one fluorescent lamp may be configured such that the actuation of at least one fluorescent lamp occurs as a function of a first signal at a first input and as a function of a second signal at a second input if the first signal and the second signal are each greater than a first prescribed voltage and less than a second prescribed voltage during a start-up phase.
    Type: Grant
    Filed: November 13, 2009
    Date of Patent: June 17, 2014
    Assignee: Osram Gesellschaft mit beschraenkter Haftung
    Inventors: Juergen Klier, Richard Pfaller
  • Patent number: 8736209
    Abstract: A drive and control circuit for motor system and the method thereof are disclosed. The motor system could be applied in a cooling device, wherein the motor system comprises a rotor, a coil and a bridge circuit. The drive and control circuit comprises a control unit, a state detecting circuit, a load determining circuit, and a startup setting circuit. The startup setting circuit makes the motor run with the maximum torque, thus to make the motor system start up easily and quickly. The load determining circuit detects the load of the motor system, thus to generate a load determining signal to determine the speed of the motor system. The control unit could be realized with few components so as to save the costs.
    Type: Grant
    Filed: April 27, 2012
    Date of Patent: May 27, 2014
    Assignee: Chengdu Monolithic Power Systems, Co., Ltd.
    Inventors: Jian Zhao, Yike Li, Yangwei Yu
  • Patent number: 8698408
    Abstract: A two-wire load control device (such as, a dimmer switch) for controlling the amount of power delivered from an AC power source to an electrical load (such as, a high-efficiency lighting load) includes a thyristor coupled between the source and the load, a gate coupling circuit coupled between a first main load terminal and the gate of the thyristor, and a control circuit coupled to a control input of the gate coupling circuit. The control circuit generates a drive voltage for causing the gate coupling circuit to conduct a gate current to thus render the thyristor conductive at a firing time during a half cycle of the AC power source, and to allow the gate coupling circuit to conduct the gate current at any time from the firing time through approximately the remainder of the half cycle, where the gate coupling circuit conducts approximately no net average current to render and maintain the thyristor conductive.
    Type: Grant
    Filed: September 14, 2011
    Date of Patent: April 15, 2014
    Assignee: Lutron Electronics Co., Inc.
    Inventor: Robert C. Newman, Jr.
  • Publication number: 20100123404
    Abstract: A single-converter circuit-based LED driver circuit (10) with isolated multi-channel outputs is disclosed. The circuit (10) includes an IC control circuit (11), a plurality of isolated output channels (70, 74) each having an output current sensing and conditioning circuit (74, 90), and an output current regulation circuit (128). The output current regulation circuit (128) includes a voltage-sensing transformer winding (T4) that senses an output voltage level across a secondary side of the circuit (10), and a peak output current sensing component (156) that senses output currents from the isolated output channels and determines which channel has a highest current output. Additionally, the circuit (10) facilitates providing output current regulation when detected output voltage is below a predetermined threshold, and providing output current regulation when the detected output voltage is above the predetermined threshold.
    Type: Application
    Filed: November 18, 2008
    Publication date: May 20, 2010
    Inventors: Timothy Chen, James K. Skully
  • Publication number: 20090261744
    Abstract: A phase-control dimming electronic ballast system and the control method thereof, wherein the system includes a phase controller, a converter, an inverter and a system controller. Moreover, the system controller senses a firing angle from the phase controller, and adjusts the output voltage of the converter and the switching frequency of the inverter to achieve the operation of dimming fluorescent lamp.
    Type: Application
    Filed: July 9, 2008
    Publication date: October 22, 2009
    Inventors: Yu-Kai Chen, Yung Chun Wu, Wen-Yang Wang, Chin-Hsiung Chang
  • Publication number: 20080218320
    Abstract: A multilevel inverter using a cascade configuration with a device for equally controlling a power factor for each unit cell includes: a master controller, a plurality of power cells connected in series for each of three AC (Alternating Current) phases, a phase shift transformer for supplying a power cell input voltage, a CAN (Controller Area Network) communication network to provide a communication path between the master controller and each power cell, and cell controllers to control output voltages and output frequencies of the respective power cells according to a voltage command and a frequency command from the master controller, each cell controller having a pulse width modulator to generate a pulse width modulation control signal of a variable voltage and a variable frequency to the connected corresponding power cell, wherein each cell controller is configured to calculate a phase difference value of the corresponding power cell according to a preset total number of connected power cells and the floor n
    Type: Application
    Filed: February 27, 2008
    Publication date: September 11, 2008
    Applicant: LS INDUSTRIAL SYSTEMS CO., LTD
    Inventor: Ha-Keun JANG
  • Patent number: 7394204
    Abstract: A method and apparatus for detecting a zero crossing or desired phase angle of a power line signal having a variable amplitude uses a ratio between a peak amplitude of the power line signal and the amplitude of the power line signal at a desired phase angle for a known amplitude version of the power line signal to detect when a variable amplitude version of the power line signal is at the desired phase angle or zero crossing. The detection of the phase angle is used to determine if a notch is present in the power line signal. A substantially constant width pulse is generated if a notch is detected regardless of the amplitude of the power line voltage or current. The invention is particularly useful in a lighting system for generating and detecting pulses used to communicate information from a power line communication controller to a series of electronic ballasts over a power line used to power the ballasts. The information can be used to control a dimming function of the ballasts.
    Type: Grant
    Filed: January 13, 2006
    Date of Patent: July 1, 2008
    Assignee: Universal Lighting Technologies, Inc.
    Inventors: Deepak Shet, Changsheng Li, John Jay Dernovsek
  • Patent number: 7215523
    Abstract: An apparatus for protecting an integrated circuit is applied to an electrical apparatus having a control unit. The control unit is used for controlling the integrated circuit and the protecting apparatus. The protecting apparatus includes a power input terminal, a power output terminal, and a control terminal. The power input terminal is used for receiving a power, and the power output terminal is used for outputting the power to the integrated circuit. The control terminal is used for receiving a control voltage of the control unit. When the control unit is at the power on mode, the control unit outputs the control voltage of a first level to prevent the power being input to the integrated circuit. Over a predetermined period of time, the control unit outputs the control voltage of a second level, so that the power can be input to the integrated through the protecting apparatus.
    Type: Grant
    Filed: November 29, 2004
    Date of Patent: May 8, 2007
    Assignee: Benq Corporation
    Inventor: Chih-Yuan Lin
  • Patent number: 6841936
    Abstract: An improved electron multiplier bias network that limits the response of the multiplier when the multiplier is faced with very large input signals, but then permits the multiplier to recover quickly following the large input signal.
    Type: Grant
    Filed: May 19, 2003
    Date of Patent: January 11, 2005
    Assignee: Ciphergen Biosystems, Inc.
    Inventors: Craig A. Keller, Fiona L. Plows
  • Publication number: 20040051485
    Abstract: A dimming control system includes dimmer modules that receive dimming level information from one of at least two control modules. Each dimmer module includes a microprocessor that provides internal intelligence for controlling power to a load in response to dimming level information. Control modules receive industry standard protocol dimming information from various sources, convert it to dimming level information, and serially communicate the dimming level information to the dimmer modules. Dimmer modules and control modules are mounted in a rack which includes a backplane having a nonvolatile memory device that retains configuration data even if control modules are removed from the rack. An inactive control module can assume control of the rack when an active control module fails.
    Type: Application
    Filed: June 17, 2003
    Publication date: March 18, 2004
    Inventors: Leonard M. Chansky, Ken Vannice, Craig LeVasseur
  • Publication number: 20030161145
    Abstract: An electrically powered flame simulator comprises at least two light sources, an integrated circuit electrically connected to the light sources for intermittently illuminating at least one of the light sources independently of other light sources such that the light sources together provide the effect of a flickering movement, and a power source for providing power to the integrated circuit. The flame simulator may be mounted in a decorative or ornamental device such as a candle or fire log, or used on decorative clothing, or may be part of a hazzard or warning system. One or more solid state light sources may also be used.
    Type: Application
    Filed: February 27, 2002
    Publication date: August 28, 2003
    Inventors: Monita Liu, Robert A. Gutstein
  • Patent number: 6469453
    Abstract: A backlight used for a liquid crystal display includes a plurality of light emitting units, and a phase controller for adjusting the phase of the light emitting units. The light emitting units are turned on and off based on pulse signals of a predetermined cycle having an on-period and an off-period. Under the control of the phase controller, the light emitting units are turned on or off with different phases.
    Type: Grant
    Filed: February 28, 2001
    Date of Patent: October 22, 2002
    Assignee: Fujitsu Limited
    Inventors: Takahisa Tajika, Masashi Takamatsu, Noriaki Urakawa, Takuji Sasahara, Haruyasu Nishiyama
  • Patent number: 6469457
    Abstract: Improvements to lighting systems, especially for entertainment and architectural applications are disclosed, including apparatus that permit a user to readily field-configure power distribution to branch circuits to be dimmed or un-dimmed, single- or multi-phase, as required; communication of data over existing power wiring by variations in output of dimmers; and improved methods for generating, managing, and distributing data specifying the physical and electrical configurations of a lighting system.
    Type: Grant
    Filed: February 13, 2001
    Date of Patent: October 22, 2002
    Inventor: Michael Callahan
  • Patent number: 6211627
    Abstract: Improvements to lighting systems, especially for entertainment and architectural applications are disclosed, including apparatus that permit a user to readily field-configure power distribution to branch circuits to be dimmed or un-dimmed, single- or multi-phase, as required; communication of data over existing power wiring by variations in output of dimmers; and improved methods for generating, managing, and distributing data specifying the physical and electrical configurations of a lighting system.
    Type: Grant
    Filed: August 27, 1999
    Date of Patent: April 3, 2001
    Inventor: Michael Callahan
  • Patent number: 6160360
    Abstract: A circuit for controlling the power to a load such as motor or incandescent lamp with reduced radio frequency interference employs a microcontroller to trigger a power transistor into a conductive state for supplying power to the load. The power transistor is switched on and off at a controlled slew rate through an integrator circuit coupled between the microcontroller and the power transistor. A zero current detector circuit detects when no current is passing through the load during each half cycle of the live voltage to switch the power transistor off by generating an interrupt request signal which is supplied to the microcontroller. After an operator selected time interval, the microcontroller generates a signal to switch the transistor to a conductive state.
    Type: Grant
    Filed: December 23, 1999
    Date of Patent: December 12, 2000
    Assignee: The Amcor Group, Ltd.
    Inventor: Daniel Davis
  • Patent number: 6137238
    Abstract: A high-efficiency self-regulated electronic ballast with a single characteristic curve for operating high-pressure sodium vapor lamps by means of an AC-to-DC converter circuit, a power factor correcting regulator circuit for reducing harmonic distortion, a high-frequency DC-to-AC converter circuit, a reducing autotransformer circuit with a current limiting inductor and an igniter, and a light-controlled switching circuit. The ballast is characterized in that it supplies a controlled high-frequency alternating voltage to the assembly of the limiting inductor and the lamp, whereby the ballast has a single characteristic curve, and in that the average power consumption of the lamp is determined on the basis of the single characteristic curve of the ballast within the standard regulation trapezoid defining the average consumption of the ballast/lamp assembly.
    Type: Grant
    Filed: September 24, 1998
    Date of Patent: October 24, 2000
    Inventors: Eduardo Salman Alvarez, Arturo Hernandez Lopez, Nefi Sifuentes Rodriguez
  • Patent number: 6034790
    Abstract: A lamp power supply circuit for an image forming device, which is not provided with a full-wave rectifier and any additional noise reducing circuit but is capable of effectively suppressing inrush current not to produce noise that may cause erroneous operation of the image forming device and affect any external appliance. A lamp lighting control system for use in an image forming device, which can realize soft-starting of an exposure lamp or a fixing heater-lamp by gradually increasing a conducting angle .beta..sub.i (i=0, 1 . . . ) for applying a voltage to a lamp through phase control of an AC power-supply voltage V.sub.AC for an initial period of energizing the exposure lamp or the fixing heater-lamp. Wherein, the conducting angle is gradually increased per even-number unit of cycles of AC power-supply voltage V.sub.AC on the condition that even numbers of cycles in the same unit have the same conducting angle, e.g., .beta..sub.0 =.beta..sub.1 <.beta..sub.2 =.beta..sub.3 <.beta..sub.4 =.beta..sub.
    Type: Grant
    Filed: October 24, 1997
    Date of Patent: March 7, 2000
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Naoyuki Kamei, Koichi Eto
  • Patent number: 5821703
    Abstract: A lighting system made up of a plurality of light fixtures which each produce a light beam, in which each of a plurality of varying devices, each having an input and an output, and each capable of varying at least one parameter of the light beam from at least one of the light fixtures, is responsive to a first value received at the input, where the first value corresponds to the desired adjustment of a parameter of the light beam. Each of the varying devices is also capable of generating a second value which represents status information, and transmitting the second value via the output. A controller produces the first value and sends it to an output which is coupled to the input of the varying device. A monitoring device has an input and is separate from the controller, and its input is coupled to the output of the varying device.
    Type: Grant
    Filed: May 12, 1997
    Date of Patent: October 13, 1998
    Inventors: Michael Callahan, John K. Chester, Robert M. Goddard
  • Patent number: 5815067
    Abstract: A dimming control for a high intensity lighting system uses a single additional control wire for control of the dimming function. The lighting system operates on multi-phase power. A transmitter for transmitting a control signal over the single control wire is connected between two of the phases of the multi-phase power supply, or between one phase and neutral. The transmitter, upon the occurrence of a predetermined condition, transmits a control signal to the single control wire. The control signal is a rectified portion of the power supply. The predetermined condition is motion as sensed by a motion sensor, operation of a timer, or operation of a manual switch. A receiver connected to the control line receives the control signal and switches the light to a low light output mode. The is accomplished by changing the capacitance of the ballast circuit for the light. Each lamp of the lighting system has a receiver connected to the single control wire.
    Type: Grant
    Filed: May 19, 1997
    Date of Patent: September 29, 1998
    Assignee: Thomas Lighting
    Inventors: David W. Knoble, Khosrow Jamasbi, Robert D. Munson, James V. Olson
  • Patent number: 5770928
    Abstract: A dimming control system includes dimmer modules which receive dimming level information from a control module. Each dimmer modules includes a microprocessor which provides internal intelligence for controlling power to a load in response to the dimming level information. The control module receives industry standard protocol dimming information from various sources, converts it to dimming level information, and communicates the dimming level information to the dimmer modules through serial communication lines. The dimmer modules and control module are mounted in a rack which includes a backplane having nonvolatile memory device that retains configuration data even if the control module is removed from the rack. The dimmer modules implement a zero cross prediction method which includes detecting an actual zero cross, calculating an error, and adding the error to the period of a line power signal.
    Type: Grant
    Filed: November 2, 1995
    Date of Patent: June 23, 1998
    Assignee: NSI Corporation
    Inventors: Leonard Chansky, Ken Vannice, Wiley Gilreath, Craig LeVasseur
  • Patent number: 5689155
    Abstract: An electronic stabilizer having a variable frequency soft start circuit, said circuit having a secondary coil coupled to a drive transformer of the electronic stabilizer. In the initial period when power is connected, the secondary coil may supply an induced voltage to a capacitor to generate a forward voltage to connect primary transistor to allow an inductance element to parallel the secondary coil to reduce the total inductance. The operating frequency of an LC oscillating circuit of the stabilizer hence increases. Relatively, the energy obtainable by the fluorescent lamp is reduced. The soft start circuit is further provided with a discharge loop of a secondary transistor for discharging of the capacitor to ensure that soft starts may be achieved under any conditions.
    Type: Grant
    Filed: October 25, 1996
    Date of Patent: November 18, 1997
    Assignee: Yao Shung Electronic Co., Ltd.
    Inventors: Eric Chung, Charles Chang
  • Patent number: 5672941
    Abstract: Lamp dimmers are disclosed in which, in the course of varying average power supplied to the lamp load, the semiconductor power control devices transition between one and the other of substantially conductive and non-conductive power conditions, the duration of the transition by the power control devices themselves is increased beyond the minimum possible duration to reduce generated EMI. The dimmers disclosed provide for varying the direction, duration, shape, and phase angle of transitions.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: September 30, 1997
    Inventors: Michael Callahan, John K. Chester, Robert M. Goddard
  • Patent number: 5619081
    Abstract: The present invention teaches a dimmer which incorporates an alternating current (AC) trigger which exhibits asymmetrical electrical characteristics. This eliminates the undesirable snap on hysteresis effect associated with conventional dimmers utilizing symmetrical AC triggers such as diacs and silicon bilateral switches (SBS). One embodiment of the present invention utilizes a zener diode to create the asymmetry. During one polarity of the AC source, the breakover voltage of the trigger is increased, forcing the trigger to breakover at a time later in the AC cycle than it would otherwise have with a symmetric trigger. This compensates for charge dumping of the phase control capacitor into the gate of the triac which would otherwise cause the snap on hysteresis effect.
    Type: Grant
    Filed: January 18, 1994
    Date of Patent: April 8, 1997
    Assignee: Leviton Manufacturing Co., Inc.
    Inventors: Bernard J. Gershen, Alfred J. Lombardi, Edward J. Krajci, Yevgeny Shafir
  • Patent number: 5600209
    Abstract: Apparatus for simulating a candle flame in which the current through the filament of a bulb is varied from a first value to a second value and back to the first value during spaced periods that vary from a period of maximum duration to a period of minimum duration that produces no observable flicker in an apparently random manner.
    Type: Grant
    Filed: December 21, 1995
    Date of Patent: February 4, 1997
    Inventor: Raymond F. St. Louis
  • Patent number: 5530301
    Abstract: An electronic delay turn off switch including a bridgelike array of four diodes disposed between an alternating current power source and a load wherein the diodes have anodes and cathodes in opposing disposition and having an SCR with anode connected to the interconnected cathodes and with cathode connected to the interconnected anodes. A gate isolation diode, a switch, a resistor-capacitor charge mode timer, and a DIAC are interconnected between the SCR anode and gate thereby providing an SCR turn on whenever the switch contacts are closed, and a delayed SCR turn off whenever the switch contacts are opened. In an alternate embodiment a variable resistor is added to enable user selection of the duration of turn off delay.
    Type: Grant
    Filed: June 6, 1994
    Date of Patent: June 25, 1996
    Inventors: Haizhong Fu, Grant V. Baumgardner
  • Patent number: 5455490
    Abstract: A lighting control system distributes both the alternating current supply and control signals representing desired adjustments to fixture parameters, such as intensity, via connections including power contacts and, for control signals, an electrically isolating coupling comprising an effective source and detector.
    Type: Grant
    Filed: February 23, 1993
    Date of Patent: October 3, 1995
    Inventors: Michael Callahan, John K. Chester, Robert M. Goddard
  • Patent number: 5323088
    Abstract: A dimming control circuit for a plurality of lighting fixtures includes a separate semiconductor power switch, e.g., a silicon-controlled rectifier or SCR, for providing controlled amounts of pulsed, unidirectional electrical current to each lighting fixture. In one embodiment, a pair of SCRs, arranged in parallel, opposed relationship, are controllably pulsed to produce an alternating sequence of positive and negative electrical current pulses, of independently-controlled duration, and oppositely-conducting diodes then connect these SCRs to two separate lighting fixture. One such lighting fixture thus receives the positive current pulses, and the other such lighting fixture thus receives the negative current pulses. In an alternative embodiment, each lighting fixture receives pulsed, unidirectional current directly from a separate, independently-controlled SCR.
    Type: Grant
    Filed: May 11, 1993
    Date of Patent: June 21, 1994
    Assignee: Gregory Esakoff
    Inventor: David W. Cunningham
  • Patent number: 5264761
    Abstract: A lamp control module including a housing having a receptacle therein with a transformer winding wound around the inner walls of the receptacle in being operatively driven by a programmed microprocessor. The transformer winding of the module is further operative to be inductively coupled to a second transformer winding which is located within an on-off switch knob of a wall switch panel, and the second transformer winding is further connected to the gate electrode of an AC switch. Pulses which are generated in the lamp control module and controlled by data values stored in the microprocessor therein are transformer coupled from the housing receptacle transformer winding into the knob switch transformer and then to the gate electrode of the AC switch. These pulses are operative to control the phase angle and conduction time of the Triac and in turn control the conduction time that an AC voltage is applied from an external AC voltage source to a lamp.
    Type: Grant
    Filed: September 12, 1991
    Date of Patent: November 23, 1993
    Assignee: Beacon Light Products, Inc.
    Inventor: Samuel A. Johnson
  • 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: 5144205
    Abstract: A dimming system provides power from a switch-controlled power source in series with a leakage auto-transformer to a compact fluorescent lamp. The system incorporates a high-frequency resonant converter that provides high voltages to strike and maintain an electric discharge in the lamp. The converter is loaded in parallel by the lamp, whose impedance damps the converter to stabilize lamp operation. An inductor, connected between the leakage auto-transformer and the resonant converter, isolates the switch-controlled power source from the high-frequency voltage. The system can be used with a variety of standard leakage reactance auto-transformers to provide full-range dimming of compact fluorescent lamps from 5 to 100 percent light output with minimal flicker.
    Type: Grant
    Filed: December 12, 1989
    Date of Patent: September 1, 1992
    Assignee: Lutron Electronics Co., Inc.
    Inventors: Eric R. Motto, Scott R. Jurell
  • Patent number: 5027052
    Abstract: A circuit arrangement for generating a pulsatory supply voltage for a load (1), such as a halogen incandescent lamp, from a source of direct voltage, in which a predetermined effective value of the supply voltage remains substantially constant in the case of a varying direct voltage. A switch (2) supplies the supply voltage from which a low-pass filter generates a mean value voltage. The mean value voltage is applied to a Schmitt trigger circuit (3) which controls the switch whose first switching threshold is constant and is derived from a reference voltage which is present at a first input of the Schmitt trigger circuit. A second switching threshold of the switch varies oppositely with respect to a decreasing direct voltage.
    Type: Grant
    Filed: March 10, 1989
    Date of Patent: June 25, 1991
    Assignee: U.S. Philips Corporation
    Inventors: Wolf-Dieter Bauch, Heinz Helmus, Heinz B. Merker
  • Patent number: 5004957
    Abstract: A circuit and a method for controlling the dimming of incandescent lights using a pair of antiparallel connected SCRs which are fired at the same frequency as the frequency of the AC line power to achieve phase control of the power supplied to the light. Only one SCR of the pair is utilized in the 0% to 50% brightness range while both SCRs are utilized in the 51% to 100% brightness range.
    Type: Grant
    Filed: January 6, 1989
    Date of Patent: April 2, 1991
    Assignee: Lee Colortran, Inc.
    Inventor: David W. Cunningham
  • Patent number: 4902936
    Abstract: A light adjusting apparatus comprising a lamp connected to a commercial a.c. power supply via a triac, and a switching control circuit operable by a direct current obtained by directly rectifying the current of the power supply for controlling the conduction timing of the triac based on the zero-cross timing of the power supply. The conduction timing of the triac is controlled by a signal obtained by producing a pulse-width modulated light adjusting signal from a signal generating circuit by a light-emitting element, causing a photodetector in the control circuit to receive the adjusting signal and subjecting the resulting output of the control circuit to pulse-width demodulation.
    Type: Grant
    Filed: May 30, 1989
    Date of Patent: February 20, 1990
    Assignee: Sharp Kabushiki Kaisha
    Inventor: Yoshikado Yamada
  • Patent number: 4893063
    Abstract: A voltage reduction unit for reducing the voltage supplied to a lighting element to a prescribed value and for maintaining the prescribed voltage across the lighting element independently of the current flowing through it. A lighting element is connected in series with a current switch, and the current switch is controlled by a voltage/current control unit which monitors the lighting element for changes and voltage and current characteristics. The voltage/current control unit comprises a differentiator circuit for detecting a slope of an AC voltage waveform and a comparator circuit for detecting a prescribed voltage on the waveform. The voltage/current control unit allows current to flow through the lighting element when both a first prescribed voltage and a prescribed voltage slope of the voltage waveform is detected, and it inhibits current flow through the lighting element when a second prescribed voltage is detected.
    Type: Grant
    Filed: October 6, 1987
    Date of Patent: January 9, 1990
    Inventor: Joseph Pernyeszi
  • Patent number: 4868460
    Abstract: This invention is a circuit for controlling the power received by a load. The operation of this circuit is based on variations of voltage amplitude rather than phase as is the case with other circuits utilizing the phase control principle. A pair of terminals couple an AC service voltage source to a load and to a distributor switch by which an operator can arrange for the load to receive power directly from the AC service voltage source, or through a transformer and a gated switch, or through a diode. The operation, by way of the transformer and the gated switch or by way of the diode, provides not only "soft-start" and protection from power line transients (voltage spikes) to the load but also prevents it from emitting acoustical noise.
    Type: Grant
    Filed: January 4, 1988
    Date of Patent: September 19, 1989
    Inventor: E. S. Papanicolaou
  • Patent number: 4862039
    Abstract: The present invention relates to an improved line regulated ballast circuit for use in controlling varied lighting applications such as, for example, neon signs and fluorescent tubes. The inventive circuit, when used in neon lighting applications, may include a function generator which controls the lighting of the neon tube in a manner allowing the tube to slowly write from one end to the other in alternating current. The function generator also allows such functions as flashing, modulation, steady state operation and steady state operation with dimming function. In a further aspect, the inventive circuit with transformers connected in parallel with one another, may be utilized to simultaneously control a plurality of neon tubes, fluorescent tubes, or both concurerntly. In this application, each of the transformers may be provided with a shunting mechanism designed to render the output current thereof infinitely adjustable.
    Type: Grant
    Filed: December 2, 1986
    Date of Patent: August 29, 1989
    Assignee: Kile Technology Corporation
    Inventors: Edwin N. Kile, Gary W. Irwin, Samuel S. Hartness
  • Patent number: 4797599
    Abstract: One or more power dimmers have a preshaped phase controlled input signal connected to their control input. The preshaped phase controlled input signal is generated from the output of a master dimmer having conventional phase control circuits operated from a manual or other control. A relay having contacts in the output circuit of the power dimmers is opened in response to the reduction of the phase controlled input signal to a value less than a given value. In an alternative embodiment, the power dimmers are replaced by an interface circuit which produces a variable frequency, pulse width modulated or other signal.
    Type: Grant
    Filed: April 21, 1987
    Date of Patent: January 10, 1989
    Assignee: Lutron Electronics Co., Inc.
    Inventors: Jonathan H. Ference, Steven M. Blonstein, Michael J. Rowen, Robert C. Newman, Jr., Joel S. Spira
  • Patent number: 4766350
    Abstract: The invention relates to an electric arrangement for operating a an electric discharge lamp (13) which is connected in series with a coil (14) and a switch (15) to a pulsatory direct voltage source. The combination of the lamp and the coil is shunted by a rectifier. The lamp is shunted by a capacitor (18) and the switch is periodically rendered conductive at an instant when the instantaneous voltage of the pulsatory direct voltage source is between 0.5 and 0.8 times the then required re-ignition voltage of the lamp. The voltage build up across the capacitor (18) after the switch has become conducting causes the lamp to reignite. The luminous efficacy of the lamp is comparatively high.
    Type: Grant
    Filed: September 10, 1982
    Date of Patent: August 23, 1988
    Assignee: U.S. Philips Corporation
    Inventors: Theo Husgen, Hubert Raets, Gerd Schiefer, Jan Zwier
  • Patent number: 4749917
    Abstract: The circuit includes a super regenerative detector (12) for receiving a modulated radio frequency signal from a transmitter. The output of the super regenerative detector is amplified and sent into a high frequency interpreter circuit (16, 18, 20) which de-modulates the signal creating an output of low frequency equal to the consecutive pulses frequency. The low frequency signal is received by a low frequency interpreter circuit (22, 24, 26) which outputs a digital signal of a single duration which is received by a counter circuit (30). The counter circuit (30) controls the firing of a triac (T1) to create lighting conditions of on, off and dimming.
    Type: Grant
    Filed: May 5, 1986
    Date of Patent: June 7, 1988
    Inventors: Paul G. Angott, Keith D. Jacob
  • Patent number: RE37168
    Abstract: Apparatus for simulating a candle flame in which the current through the filament of a bulb is varied from a first value to a second value and back to the first value during spaced periods that vary from a period of maximum duration to a period of minimum duration that produces no observable flicker in an apparently random manner.
    Type: Grant
    Filed: February 1, 1999
    Date of Patent: May 8, 2001
    Inventor: Raymond F. St. Louis