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| Number | Title | Issue Date |
| 8179055 | LED circuits and assemblies An AC-driven LED circuit 10 includes a first parallel circuit 12 having a first branch 14 and a second branch 16 which connect at first and second common point 18, 20. The common points 18, 20 provide input and output for an... | 05/15/2012 |
| 8148911 | Current-balance circuit and backlight module having the same The present invention relates to a current-balance circuit and a backlight module having the same. The current balance circuit includes a current balance unit, a control unit, and a detection unit. The current balance unit is connected to a plurality of light units ... | 04/03/2012 |
| 8058814 | Bi-directional light emitting diode drive circuit in pulsed power series resonance The present invention comprises of a first impedance constituted by the capacitive impedance and a second impedance constituted by the inductive impedance, wherein the first and second impedance after series connection appears in the series resonance status to gener... | 11/15/2011 |
| 7439945 | Light emitting diode driver circuit with high-speed pulse width modulated current control A Light-Emitting Diode (LED) driver circuit is disclosed that controls the brightness of light generated by a LED that is coupled between a first terminal and a second terminal in response to a user supplied brightness control signal. A constant current source gener... | 10/21/2008 |
| 7423389 | LED driving device of overvoltage protection and duty control An LED driving device comprises a PWM IC including an RT/CT terminal operated by a power voltage and generating and outputting a sawtooth wave voltage of a predetermined frequency, a COMP terminal to which a comparison voltage compared with the sawtooth wave voltage... | 09/09/2008 |
| 7282863 | Auxiliary quartz lamp lighting system for electronic high intensity discharge lamp ballasts A method and electronic circuit operate a quartz auxiliary lamp lighting lamp and circuit to light a quartz auxiliary lamp at 120 Vac and 50-60 Hz current connected to an electronic HID ballast operating at a frequency of 100 Hz to over 400 kHz and voltages of from ... | 10/16/2007 |
| 7215523 | Apparatus for protecting an integrated circuit and method thereof 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 p... | 05/08/2007 |
| 7164237 | Circuit arrangement for operating discharge lamps A DC-AC converter in a half bridge configuration is used for operation with high pressure discharge lamps as well as low pressure discharge lamps. The converter consists in two switches (T1-T2) serially connected through a first series of diodes (D1... | 01/16/2007 |
| 7009347 | Multiple discharge load electronic ballast system An embodiment of the present invention pertains to a multiple discharge load electronic ballast system, including a distribution bus and a plurality of electronic ballasts. The distribution bus has a nominal distribution power rating. The plurality of electronic bal... | 03/07/2006 |
| 6646391 | Light source device of a dielectric barrier discharge lamp A light source device for a dielectric barrier discharge lamp including a dielectric barrier discharge lamp having a discharge space, the discharge space being filled with a discharge gas which produces excimers by a dielectric barrier discharge; first an... | 11/11/2003 |
| 6486618 | Adaptable inverter A DC-AC inverter that is adaptable for use with different input voltages and for use with different loads. The DC-AC inverter has a voltage-step-up network, with the step-up voltage set by a controller that drives totem-pole configured FET switches at a d... | 11/26/2002 |
| 6459218 | Inductively powered lamp unit An inductively powered lamp unit 806 is fixed onto a substrate and over a position where a primary inductive loop 803 is spread apart (as at 807). At such sites, a horizontal (or at least parallel to the surface of the substrate) component of alternating ... | 10/01/2002 |
| 6445137 | Dielectric barrier discharge lamp apparatus Dielectric-barrier discharge lamp light source equipment having a plurality of dielectric-barrier discharge lamps (B), each of which has a discharge plasma space (G) filled with a discharge gas in which a dielectric-barrier discharge will produce excimer ... | 09/03/2002 |
| 6300724 | System and method for controlling rare gas illumination A rare gas illumination system and method are configured to provide a sweeping illumination effect. In one embodiment, the rare gas illumination system includes a tube containing a gas and having a first electrode at a first end and a second electrode at ... | 10/09/2001 |
| 6232726 | Ballast scheme for operating multiple lamps A ballast including a single sense element and a single controller for mulitple lamp operation. The ballast avoids the need for separate feedpaths for sensing individual lamp conditions and/or the need for separate controllers for controlling the individu... | 05/15/2001 |
| 6225757 | Combination MH/HPS ballast A combination electronic ballast designed to operate a metal halide lamp and a high-pressure sodium gas discharge lamp is disclosed. The ballast includes a primary and secondary coil coupled to a magnetic core. The primary is adapted to be connected to an... | 05/01/2001 |
| 6172467 | Method and device for producing series of impulse voltages to operate discharge lamps and circuit pertaining thereto A method for producing pulsed-voltage sequences for the operation of discharge lamps (8) by means of a pulsed discharge which is impeded dielectrically provides that the pulsed-voltage sequence is composed of two partial voltage sequences in such a manner... | 01/09/2001 |
| 6072286 | Auxiliary lighting control circuit and method for a HID lamp lighting system An auxiliary lighting control circuit and method for a lighting system having a HID lamp as the primary light source and an auxiliary light source for providing light when the HID lamp is extinguished or below full brightness but power remains available t... | 06/06/2000 |
| 5994849 | Method for operating a lighting system and suitable lighting system therefor The invention pertains to a method for operating a lighting system with an ncoherently-emitting radiation source, in particular a discharge lamp (14) that emits UV, IR or visible-range radiation, by means of dielectrically inhibited discharge, and to a lig... | 11/30/1999 |
| 5763964 | Distributed neon power supply system A high frequency power supply for distributed luminous tube signage including a master power unit and one or more slave units. The master unit includes a digital oscillator, controller, and electronic switches to induce a switched high frequency waveform ... | 06/09/1998 |
| 5561346 | LED lamp construction An improved LED lamp construction is disclosed having a plurality of LEDs electrically interconnected and mounted upon opposed rounded surfaces formed at one end of the lamp body. The opposed rounded surfaces comprise a substantially semi-spherical lamp h... | 10/01/1996 |
| 5504400 | Two-channel AC light dimmer and lighting system An electronic AC light dimmer, lighting system and method are disclosed that provide two-channel operation by allowing independent control of positive and negative half cycles of AC power. In one embodiment, the dimmer comprises a positive half-cycle cont... | 04/02/1996 |
| 5300864 | Programmable lighting control system A programmable lighting control system for decorative, artistic, and Christmas lighting applications, includes a plurality of outlet receptacles for connection thereto of series or parallel connected Christmas tree lighting strings or the like, a pluralit... | 04/05/1994 |
| 5276385 | High-pressure discharge lamp and lighting method The invention provides a high-pressure discharge lamp incorporating an outer envelope storing a pair of electric terminals a plurality of arc tubes which are respectively stored in this outer envelope and electrically connected in parallel, and a pluralit... | 01/04/1994 |
| 5192895 | Synchronously-controlled light string A synchronously-controlled light string includes a plurality of light string units, each of which has a plug in one end and a socket in the other end, thereby allowing the light string units to be coupled together. Each light string unit has a control cir... | 03/09/1993 |
| 5140225 | High frequency lamp transformer for linear lighting fixture A lamp power transformer circuit which is packaged in a module housing having the same size, shape and cross section as a linear lighting fixture to which it is attached. The transformer circuit is designed to rectify input 60 Hz power and to switch the D... | 08/18/1992 |
| 5081401 | Driver circuit for a plurality of gas discharge lamps A circuit (100) for driving a plurality of gas discharge lamps (102, 104), and having: input terminals (126, 130) for connection to a source of voltage supply; output terminals (134, 136, 140) for connection to the lamps in series; an oscillator (124, 132... | 01/14/1992 |
| 5008595 | Ornamental light display apparatus Ornamental and decorative light display utilizing LEDs constructed of two or more individual diodes. Each diode or portion of a diode is alternately selected and energized at a sufficient frequency that colors can blend to produce another color. The syste... | 04/16/1991 |
| 4996463 | Auxiliary lighting system for high intensity discharge lamp An auxiliary lighting system to be used with a high intensity discharge lamp having a solid state or electronic ballast. An auxiliary lamp is connected to a source of power through the normally closed contacts of a relay. The relay coil is in the input li... | 02/26/1991 |
| 4973886 | Four lamp fluorescent ballast means A four way rapid start fluorescent fixture with two ballast means each of which ballast means has three pairs of lamp wires emanating from one of its ends.... | 11/27/1990 |
| 4973887 | Four lamp fluorescent wiring arrangement A rapid start fluorescent fixture with two ballast means each having three pairs of associated lamp wires in which one pair of said associated wires of each ballast means is used to connect a heater winding to electrodes of a pair of lamps with which the ... | 11/27/1990 |
| 4912372 | Power circuit for series connected loads A power circuit for N series connected loads according to the present invention includes N transformers having primary windings connected in series across a constant current AC source and secondary windings connected in series with the N loads. N-1 conduc... | 03/27/1990 |
| 4912371 | Power saving fluorescent lamp substitute An improved non-lighting fluorescent lamp substitute to replace one lamp in a two-lamp series connected circuit so that the circuit is completed through the remaining lamp allowing it to light, whereas without the lamp substitute, the circuit is incomplet... | 03/27/1990 |
| 4818918 | High frequency lighting system for gas discharge lamps A high frequency system for gas discharge lamps includes a method of, and apparatus for, controlling the operation of a plurality of gas discharge lamps and provides; a reduction in starting and operating voltage and current; an increased range of dimming... | 04/04/1989 |
| 4727289 | LED lamp The present invention provides a light-emitting diode lamp having a printed circuit board which is arranged inside a glass bulb having a base at an end thereof, via a stem and stays. A plurality of light-emitting diodes are mounted on the printed circuit ... | 02/23/1988 |
| 4523132 | Centrally controlled lighting installation having a plurality of individually switched light points central switch elements and individual light switches therefor This invention relates to a lighting system having a plurality of individual light points or groups of individual light points which may be controlled by means of a central switch element, acting on all individual light points, whereby the function of the... | 06/11/1985 |
| 4508996 | High frequency supply system for gas discharge lamps and electronic ballast therefor The invention is both a system for supplying high frequency alternating current to gas discharge lamps, such as fluorescent lamps, and the like and a unit that can be placed in or adjacent to a lighting fixture to convert a direct current supply into high... | 04/02/1985 |
| 4443739 | Electric device comprising at least one low-pressure mercury vapor discharge tube An electric device comprising at least one low-pressure mercury vapor discharge tube intended to be connected to an AC voltage source at a frequency of 50 to 60 Hz. The discharge tube is of a type which produces a comparatively large current distortion an... | 04/17/1984 |
| 4438372 | Multiple low-pressure discharge lamp operating circuit To operate at least one, and preferably a plurality of fluorescent lamps, a elf-oscillating transistor push-pull switching oscillator, using two similar transistors (T1, T2), is connected to respective lamps (3, 3', 3"), with an oscillatory circuit (4, 4',... | 03/20/1984 |
| 4388559 | Bicycle lighting system A flash tube is provided for producing successive high intensity bursts of light, and a pulse producing device is provided for supplying a train of high voltage pulses for energizing repeatedly the flash tube. An impedance matching arrangement is provided... | 06/14/1983 |
