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| Number | Title | Issue Date |
| 8183799 | Starter stopper for high intensity discharge lighting A starter stopper for use with a high intensity discharge (HID) lighting source includes a timer and switch. The timer controls the durations of on-time and off-time periods during an energizing period. The starter stopper connects the HID lighting source to power t... | 05/22/2012 |
| 8159155 | Light emitting unit arrangement and control system and method thereof The present invention relates to a control system (12) for controlling the light output of a light emitting unit (10), which light emitting unit comprises at least one light emitting diode (LED) (14) and is adapted to emit light of at least one ... | 04/17/2012 |
| 8159154 | Apparatus and method of driving backlight unit and display apparatus employing the same An apparatus and a method of driving a backlight unit and a display apparatus employing the same. Wherein a driving current, which is divided in a step-by-step fashion, is sequentially changed and output according to a current control signal. The current control sig... | 04/17/2012 |
| 8154223 | Driving apparatus of light emitting diode and driving method thereof A driving apparatus of a light emitting diode (LED) and a driving method thereof are provided. In the driving method, when the driving apparatus performs dimming and a duty cycle of a dimming signal is smaller than a predetermination value, outputting time of drivin... | 04/10/2012 |
| 8138691 | Multi-channel driving circuit and driving method thereof A driving method of a multi-channel driving circuit includes: receiving multiple driving signals corresponding to multiple to-be-driven elements, providing multiple randomized time delays, respectively adjusting the driving signals according to the randomized time d... | 03/20/2012 |
| 8111023 | Control system for different colors of light emitting diodes A control system includes a clock unit for providing a first clock signal, and a second clock signal having a frequency lower than that of the first clock signal. Three control units are coupled respectively to three light emitting diodes (LED) emitting respectively... | 02/07/2012 |
| 8106608 | Lighting system A lighting system includes a power source, a switch, a time detecting circuit, a controlling circuit, a driving circuit and an LED lamp electrically connected together. The time detecting circuit could detect switching times and periods of the switch at an “on” ... | 01/31/2012 |
| 8063588 | Single-input control circuit for programming electronic ballast parameters A circuit uses a single control input to an oscillator of an electronic ballast to program the parameters of soft-start frequency, pre-heat frequency, ignition ramp time, and ballast run frequency. The output frequency of the oscillator is based on an electrical par... | 11/22/2011 |
| 8058822 | Power saver device for public lighting systems and method thereof Various exemplary embodiments relate to an energy saving device which supplies high efficiency sodium-vapor street lights and a method of providing additional savings of electrical energy by means of the temporary reduction in the luminous flow of a high efficiency ... | 11/15/2011 |
| 8004217 | Electronic ballast with integral shutdown timer The present invention provides, in one embodiment, a gas discharge lamp ballast with an integral shutdown timer. The ballast includes a circuit for receiving AC power, a converter circuit for converting the AC power to DC power and a square wave oscillator powered f... | 08/23/2011 |
| 7982415 | Discharge lamp lighting apparatus A discharge lamp lighting apparatus includes a switch circuit for DC/AC converting, a discharge lamp connected to a secondary winding of a transformer, a current detector detecting an AC output current of the discharge lamp, an error amplifier outputting an error si... | 07/19/2011 |
| 7956556 | Apparatus and method for compensating for reduced light output of a solid-state light source having a lumen depreciation characteristic over its operational life A method, apparatus, and system for compensating for lamp lumen depreciation. The method includes operating the lamp under rated wattage for a period towards the first part of operating life of the lamp. Operating wattage is increased at one or more later times. Ene... | 06/07/2011 |
| 7928671 | Illumination intensity control A method for controlling average current. The method enables control of average current independent of instantaneous current. The average current is controlled by changing the number of unit pulses provided during a time interval. The unit pulses are used to switch ... | 04/19/2011 |
| 7915839 | Method and electronic control system to compensate for the aging-related brightness loss of an electroluminescent element The invention relates to a method for compensating the ageing-related loss of luminosity of an electroluminescence element, according to which the cumulative electrical energy supply, i.e. the integral of the supplied electrical power over the period of operation, i... | 03/29/2011 |
| 7863836 | Control circuit and method for regulating average inductor current in a switching converter A switching power converter has an input voltage source. An output load is coupled to the input voltage source. An inductive element is coupled to the load. A switch is coupled to the inductive element. A current reference input is provided. A control circuit is cou... | 01/04/2011 |
| 7781990 | Illumination brightness and color control system and method therefor An illumination brightness and color control system and method therefor are provided. A broadband light source monitor senses and samples a point light source for a luminous intensity signal value. Then, a corrected current value is computed based on a difference be... | 08/24/2010 |
| 7768216 | Control circuit and method for controlling light emitting diodes A control circuit for controlling light emitting diodes comprises a switch for turning on or off a string of light emitting diodes. A combiner generates a control signal from a data signal and a noise signal. A sigma delta modulator receives the control signal and a... | 08/03/2010 |
| 7764028 | LED drive circuit and LED light-emitting device A driver circuit 3 feeds a pulse signal to an SSR 2 every half wave of alternating-current power from a commercial power source 4, and thereby separately controls the amounts of emitted light of LED groups 1x and 1y f... | 07/27/2010 |
| 7701152 | Method and circuit for controlling operation of a light-emitting diode A light-emitting diode control circuit is provided, that includes: a duration selection circuit for selecting one of a first duration value, a second duration value, a third duration value, or a fourth duration value as a selected duration value based on a selection... | 04/20/2010 |
| 7688008 | Lighting lamp A lighting lamp 1 using LED lamps as a light source can include a delay circuit 5, a power supply control unit 6, and a timer circuit 7. The delay circuit 5 can be configured to cause the luminous intensity of the LED lamps to rise... | 03/30/2010 |
| 7688009 | LED current controller and method therefor In one embodiment, an LED current control circuit is configured with a sample and hold circuit that samples an error signal of an error amplifier during one time and holds the sampled value during a second time. ... | 03/30/2010 |
| 7675251 | Apparatus and method for compensating for reduced light output of a light source having a lumen depreciation characteristic over its operational life A method, apparatus, and system for compensating for lamp lumen depreciation. The method includes operating the lamp under rated wattage for a period towards the first part of operating life of the lamp. Operating wattage is increased at one or more later times. Ene... | 03/09/2010 |
| 7659676 | Lighting system using GPS receiver A lighting system using a GPS receiver is provided. The lighting system includes: a GPS receiver for calculating sunrise time and sunset time from an inputted GPS signal and outputting an on/off signal and a satellite detection indicating signal according to the cal... | 02/09/2010 |
| 7642735 | Using pulse density modulation for controlling dimmable electronic lighting ballasts Pulse Density Modulation (PDM) is used to control the amount of light from a fluorescent lamp by applying a voltage to the lamp filaments at a low frequency that is approximately at a series resonant frequency of the lamp ballast inductor and the lamp filament capac... | 01/05/2010 |
| 7573212 | Automatic power control module for battery powered devices A power control module which can be used to automatically open a power circuit for electrically operated devices, particularly battery operated devices, during predetermined periods of non-use. A timer is reset by a motion detector indicating continuing use. The tim... | 08/11/2009 |
| 7456590 | Vehicular lamp A vehicular lamp used in an automobile includes: semiconductor light emitting elements for emitting light; a time measurement unit for measuring time in which the semiconductor light emitting elements continues to emit light; and a current supplying unit for supplyi... | 11/25/2008 |
| 7453219 | Method and apparatus for controlling illumination of a display in a portable wireless communication device A portable wireless communication device having a display screen, a light source that is capable of illuminating the display screen, and a processor coupled to the light source, dynamically adjusts a period of time during which the display screen is illuminated. The... | 11/18/2008 |
| 7439690 | Discharge lamp lighting apparatus and discharge lamp lighting method A lighting control technology for a discharge lamp can be capable of suppressing start-up variations of luminous flux in consideration of variations in lamp voltage. A discharge lamp lighting apparatus can include a lamp voltage detection circuit and a lamp current ... | 10/21/2008 |
| 7436134 | Cyclical, aquarium and terrarium light The aquarium or terrarium light systems simulates rising and setting of the sun. A housing contains two lamps, one variable lumen output for graduated light output and the other for full ON or OFF lighting. The light fixture contains a timer/dimming unit to variably... | 10/14/2008 |
| 7436123 | Discharge lamp ballast device and lighting appliance An inverter controller dives an inverter to operate at a switching frequency selectively from one of a preheating frequency (f1), a starting frequency (f2), and a lighting frequency (f3) which are different from each other, thereby giving a preh... | 10/14/2008 |
| 7432662 | Circuit arrangement and method for operating at least one lamp The present invention relates to a circuit arrangement for operating at least one lamp (LA), which has a first filament (W1) and a second filament (W2), it comprising an apparatus (10) for determining a variable which is correlated with the temp... | 10/07/2008 |
| 7432660 | IC-based low cost reliable electronic ballast with multiple striking attempts and end of lamp life protection The present invention relates generally to a simple, low cost ballast for fluorescent lamps that incorporates an integrated circuit and a number of ballast protection functions to cost effectively enhance its reliability. End of lamp life circuitry is provided to sh... | 10/07/2008 |
| 7429829 | Discharge lamp lighting circuit with an open protection circuit A discharge lamp lighting circuit includes a plurality of discharge lamps, a driving circuit, a control circuit, an open protection circuit, which are connected in series. The open protection circuit includes an open control circuit, a delay circuit, and a plurality... | 09/30/2008 |
| 7425802 | Discharge lamp lighting apparatus, luminaire and illumination system There is provided a high-intensity discharge lamp lighting apparatus to be loaded with a plurality of types of high-intensity discharge lamps and connected with any one of the lamps to be lighted, and the apparatus comprises a power conversion circuit for converting... | 09/16/2008 |
| 7425804 | Lamp drive device of projector A projector includes a lamp drive circuit which drives a lamp, and a lamp drive current detection unit which detects the lamp drive current. Based upon the lamp drive current which is detected, the lamp drive circuit controls the lamp drive current by PWM control, s... | 09/16/2008 |
| 7420338 | Ballast control IC with minimal internal and external components A ballast controller integrated circuit which executes a specific set of instructions via an integrated state diagram architecture to control a fluorescent lamp or high intensity discharge lamp and protect the ballast. The state diagram architecture controls powerin... | 09/02/2008 |
| 7414372 | Dimming ballast control circuit A dimming ballast control circuit for driving a ballast power switching circuit powering a gas discharge lamp. The circuit includes a driver circuit for driving high and low side switches of the ballast power switching circuit; a control circuit for driving the driv... | 08/19/2008 |
| 7405524 | Light management system device and method A lighting control system is disclosed. The lighting control system is electrically coupled to a load circuit for controlling indoor and/or outdoor lighting. The lighting control system includes a control module with a night light for providing low-level night light... | 07/29/2008 |
| 7405522 | Multiple failure detection shutdown protection circuit for an electronic ballast A shut-down circuit configured for use with an electronic ballast coupled to a lamp in a control path includes a device for sensing the electrical energy associated with the control path, and a sensing circuit for shutting down the ballast in the event that the ener... | 07/29/2008 |
| 7402962 | System and methods of driving an electroluminescent lamp Embodiments of the present invention include systems and methods of driving an electroluminescent lamp. In one embodiment, the electroluminescent lamp is driven to a first threshold during a first time period and then driven to successive voltages between the thresh... | 07/22/2008 |
