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7567039 |
Multiple discharge lamp lighting apparatus
A multiple discharge lamp lighting apparatus is provided which achieves stable and uniform lamp currents in a plurality of discharge lamps without a ballast element at the secondary side of an...
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7564193 |
DC-AC converter having phase-modulated, double-ended, full-bridge topology for powering high voltage load such as cold cathode fluorescent lamp
A phase-modulated, double-ended, full-bridge topology-based DC-AC converter supplies AC power to a load, such as a cold cathode fluorescent lamp used to back-light a liquid crystal display. First...
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7564194 |
Method for detecting lamp current and lamp driving circuit using the method for detecting the lamp current
A lamp driving circuit includes: a voltage supply part including a first voltage supply part and a second voltage supply part; a first circuit part including a first terminal, a second terminal and...
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7564197 |
Discharge tube operation device
A time division signal (S 2 ) for instructing a lit period and an unlit period of a discharge tube ( 23 ) is input to an error amplifier ( 41 ) of an integration circuit ( 40 ). The integration...
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7564201 |
Intelligent gas discharge lamp control circuit
An electronic control circuit for intelligently controlling a gas discharge lamp associated with an HVAC system. The circuit includes a microcontroller having a memory containing instructions...
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7564200 |
Discharge lamp lighting circuit with frequency control in accordance with phase difference
A discharge lamp lighting circuit is provided. The discharge lamp lighting circuit includes a power supplying portion which comprises an inverter circuit comprising a switching element; a series...
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7564192 |
HID dimming method and apparatus
A HID dimming method and apparatus are provided. The method includes generating a dc waveform during a reduced power dimming mode of operation of the HID lamp, the reduced power dimming mode being...
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7560874 |
Electronic ballast with improved inverter startup circuit
An electronic ballast ( 20 ) for powering at least one gas discharge lamp ( 30 ) comprises a self-oscillating half-bridge inverter ( 200′ ) having an inverter startup circuit ( 286,288,290 ) that...
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7560873 |
Method for detection of non-zero-voltage switching operation of a ballast of fluorescent lamps, and ballast
The invention relates to a method for detection of non-zero-voltage switching operation of a lamp ballast, which has a half-bridge circuit with a first and a second semiconductor switching element,...
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7560867 |
Starter for a gas discharge light source
A starter for a gas discharge light source is configured to measure an initial resistance of one or more filaments of the gas discharge light source, such as a fluorescent light, each time the gas...
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7560877 |
Operation circuit for a discharge lamp and device for operation of a discharge lamp and a light source device
An operating circuit for a discharge lamp having an external auxiliary electrode and main discharge electrodes in a discharge space, in which the disadvantage of lamp damage due to detachment of...
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7560868 |
Ballast with filament heating and ignition control
A ballast ( 10 ) for powering at least one gas discharge lamp ( 70 ) having heatable filaments ( 72,74 ) includes an inverter ( 200 ), a resonant output circuit ( 400 ) coupled between inverter (...
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7560878 |
Circuit arrangement and method for operating high-pressure discharge lamps
High-pressure discharge lamps may explode at the end of their life. In order to be able to predict an explosion, the gradient of the operating voltage is evaluated. If a risk of explosion is...
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7560879 |
Method and apparatus for DC to AC power conversion for driving discharge lamps
Methods and circuits are disclosed for converting DC power to AC power for driving discharge lamps such as cold cathode fluorescent lamps (CCFLs). Among other advantages, the lamp current and open...
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7557516 |
Resonant inverter
The present invention provides a low-cost inverter for ballast. A current transformer is connected in series with a lamp to operate the lamp. A first transistor and a second transistor are coupled...
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7557519 |
Controlling power to light-emitting device
A circuit to control power to a light-emitting device connected in parallel to an inductive device switching current to the parallel combination repeatedly between a charge state during which said...
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7557523 |
Discharge lamp lighting device, and lighting equipment and lighting system using the device
A level shift IC ( 3 b ) of a power supply/shutoff section ( 3 ) is operable, when a shutoff signal (Sa) is input from a timer circuit ( 8 ) for a time T during an ON state of a discharge lamp ( 7...
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7557521 |
LED power control methods and apparatus
Methods and apparatus for providing and controlling power to loads including one or more LEDs. In one example, a controlled predetermined power is provided to a load without requiring any feedback...
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7557520 |
Light source driving circuit
A light source driving circuit for driving a light-emitting element is provided. The light source driving circuit includes a power supply circuit, a dimming circuit, and a feedback circuit. A first...
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7557515 |
Simplified ballast control circuit
A ballast control circuit for use with a fluorescent lamp in accordance with an embodiment of the present application includes a voltage controlled oscillator operable to provide an operating...
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7554271 |
Single stage PFC and power converter circuit
A power converter provides constant load power while achieving a high power factor in a single stage configuration with reduced component count and ratings. The power converter takes a rectified...
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7554272 |
Low noise electroluminescent lamp (EL) driver and method therefor
An EL driver circuit has a full H-bridge circuit. A boost converter is coupled to the full H-bridge circuit. The boost converter is pulse width modulated to generate a gradual increase in voltage...
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7554273 |
Protection for external electrode fluorescent lamp system
The present invention provides a driving circuit with protection function for driving a set of external electrode fluorescent lamps (EEFL). The drive circuit includes: a transformer connected to...
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7553152 |
Flame detector trapezoidal excitation generator output control circuit and method
An electronic circuit for generating a trapezoidal excitation waveform includes a controllable frequency source and a trapezoidal waveform generator. The controllable frequency source generates a...
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7550929 |
Power system and method for driving plural lamps
A power system for driving plural or multiple lamps includes a transformer circuit, a filter and steady-flow circuit, and a light source. The transformer circuit transforms a voltage level of an...
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7550933 |
Offline control circuit of LED driver to control the maximum voltage and the maximum current of LEDs
An offline control circuit of LED driver controls the maximum voltage and the maximum current of a plurality of LEDs. A switching circuit generates a plurality of LED currents through a...
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7548150 |
Method for the allocation of short addresses in illumination systems
In a method for the allocation of short addresses in illumination systems, whose illumination components (DALI EB, Lp) are controlled via a DALI bus, the short address is determined and allocated...
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7548029 |
Bi-directional current sensing by monitoring VS voltage in a half or full bridge circuit
An apparatus and method for determining the output current in a bridge-connected switched transistor output circuit including high-side and low-side transistor switches, typically MOSFETS. The...
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7545106 |
Discharge lamp driving device and driving method
A discharge lamp driving device for driving a lamp module ( 23 ) including a plurality of lamps includes a switch circuit ( 21 ), a transformer and filter circuit ( 22 ), and a microcontroller ( 20...
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7545369 |
Methods and apparatus to improve efficiency in cold cathode fluorescent light controllers
Methods and apparatus to improve efficiency in cold cathode fluorescent light (CCFL) controllers using a full bridge resonant implementation. The secondary of a transformer drives the CCFL, with...
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7541745 |
Fluorescent lamp assembly having multiple settings and method
A fluorescent lamp assembly includes a fluorescent lamp ballast capable of detecting at least one of a plurality of input signals and generating an output signal. The output signal is associated...
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7541744 |
Electronic ballast for a high-pressure discharge lamp having a current-measuring device
The invention relates to an electronic ballast and to an operating method for high-pressure discharge lamps. During a current measurement, in particular for current regulation, only switching...
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7541746 |
Lamp driver circuit with power factor correction circuit coupled to direct-current to direct-current power converter
A lamp driver circuit is disclosed. The lamp driver circuit comprises a passive power factor correction (PFC) circuit. The passive PFC circuit, in operation, is coupled with an alternating-current...
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7535182 |
Flat panel display device having thermostat
A flat panel display device includes an electron emission substrate; an image forming substrate spaced apart from the electron emission substrate; a spacer disposed between the electron emission...
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7535184 |
Photopolymerization apparatus
A light-weight, portable photocuring device possesses a single light emitting diode (LED). The single LED backed with a heat sink is driven by a driving circuit and controlled by a timing circuit....
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7531966 |
Lamp ballast circuit
In one embodiment, a power switch driving circuit is provided for a fluorescent lamp ballast. The circuit includes a first power switch driven by a first driver. A controller has a first output...
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7531969 |
Arc lamp improvements
An arc lamp power supply with a first part including a converter adapted to convert a low voltage power supply to provide an arc running power supply suitable for running an arc lamp after an arc...
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7531970 |
Power source driving circuits and controllers thereof
A controller for a driving circuit of power source comprises a frequency generator, a pulse width modulator, and a driving device. The frequency generator comprises a latch circuit. The frequency...
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7531971 |
Backlight units and display devices
A backlight unit comprising a boost circuit and a backlight element. The boost circuit is coupled to a voltage source and controlled by a PWM signal and a switch signal. When the backlight unit...
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7528557 |
Electronic controller for high-power gas discharging lamp
An electronic controller for a high-power gas discharging lamp bulb includes a filter circuit to reduce interference and control the electromagnetic characteristics of an input power signal. A...
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7525780 |
Liquid crystal television and backlight power supplying circuit
Disclosed is an inverter-circuit power supply circuit capable of redriving an inverter circuit upon temporary blackout without turning on a main power again An inverter-circuit power supply circuit...
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7525259 |
Primary side regulated power supply system with constant current output
According to an embodiment, a power supply system has a primary side and a secondary side. An input terminal on the primary side is operable to receive an input voltage. An output terminal on the...
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7521877 |
Dimmer circuit for a discharge lighting apparatus
There is provided a discharge lamp lighting apparatus including a dimmer circuit which is provided with a control means to dynamically adjust screen brightness according to an input signal, and a...
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7521873 |
Circuit designs and control techniques for high frequency electronic ballasts for high intensity discharge lamps
The present invention provides an electronic ballast for a high intensity discharge lamp such as a metal halide lamp. The ballast includes an inverter and a resonant circuit with an ignition...
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7521876 |
Electronic ballast with lamp type determination
An electronic ballast includes open circuit voltage regulation comprises an filament current sensing circuit 224 operably connected to an output of the electronic ballast and generating a sensed...
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7521912 |
Power supply apparatus
In a power supply apparatus for performing constant current driving of a light emitting diode which is a load circuit, a constant current circuit is disposed on a path for driving the load circuit....
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7521874 |
Dimmable ballast control integrated circuit
An IC for controlling a power supply circuit for delivering power to a fluorescent lamp in accordance with an embodiment of the present invention includes a ballast control section operable to...
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7518317 |
Backlight driving and control circuit with an isolated power factor correction structure
A backlight driving and control circuit with an isolated power factor correction structure includes a power stage for providing a power supply; a driver stage having a first power factor correction...
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7514878 |
High frequency electronic ballast with sine wave oscillator
A high frequency sinusoidal wave is generated and applied directly to a gas discharge lamp in a power efficient electronic ballast. Uniting a high frequency current fed oscillator with a...
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7514883 |
Illuminating device for imaging apparatus
An illuminating device for imaging apparatus includes: a light source; plural batteries that supply power to the light source; plural detection voltage generating units that are provided with...
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