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WO/2009/019647A1 |
In a method of controlling ignition of a gas discharge lamp, an ignition voltage is provided to the lamp in at least one ignition attempt. A time or number of ignition attempts is counted. The count of time and/or number of ignition atte...
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WO/2009/019624A2 |
The present invention provides a lamp driving circuit. When it is used to drive a number of lamps arranged in a hybrid serial-parallel configuration, the lamp driving circuit eliminates the parasitic current in series branch circuits by ...
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WO/2009/020634A1 |
A ballasted lamp socket for a gas discharge lamp, such as a compact fluorescent lamp, is adapted to replace an Edison screw-in lamp socket in a ceiling mounted light fixture, or a table or floor lamp. The ballasted lamp socket comprises ...
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WO/2009/015687A1 |
The present invention relates to an electronic ballast (10) for operating at least one discharge lamp, comprising an input stage (12) and an output stage (14), wherein the input stage (12) is designed for providing at the output thereof ...
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WO/2009/013986A1 |
A transmissive liquid crystal display device (10) is provided with a display panel (4), a backlight (3) and an inverter section (2). The liquid crystal display device is also provided with a comparison processing section (51) which judge...
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WO/2009/013995A1 |
A discharge lamp lighting apparatus capable of detecting current flowing through a discharge lamp highly accurately without requiring a larger number of substrates for current sensing circuits.The discharge lamp lighting apparatus compri...
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WO/2009/013840A1 |
An electric-discharge lamp lightning device comprises a first frequency control circuit (13) for sweeping an operation frequency (finv) so that the output of an inverter circuit (2) is gradually increased in order to allow an electric-di...
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WO/2009/014204A1 |
A discharge lamp electron ballast includes a power conversion circuit having an inverter circuit and a resonance circuit, a drive circuit, a frequency control circuit, a prediction circuit, and a correction circuit. The inverter circuit ...
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WO/2009/013656A1 |
A universal line voltage dimming method and system, with a control circuit for an electronic ballast operable to receive ballast input power and an outboard dedicated dimming signal including a power sensing circuit (27) generating a sen...
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WO/2009/013524A1 |
At least one electric discharge lamp capable of generating a broadband output pulse of a range of wavelengths in the visible spectrum, the output pulse having a predetermined time interval and a predetermined total electrical energy inpu...
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WO/2009/014418A1 |
In a method for operating an electronic gas discharge lamp by means of a TRIAC circuit, a current is drawn from the dimmer circuit (1) when the TRIAC (5) is in a non-conductive state to bring the TRIAC (5) in the conductive state and the...
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WO/2009/011163A1 |
A control circuit for discharge lamp which can enhance the lighting properties of a discharge lamp while reducing power consumption. A light source device is also provided. Resistance of variable resistors (RC1, RC2) is not switched to a...
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WO/2009/010924A2 |
The invention relates to a gas-discharge lighting system for motor vehicles, having a ballast connected to a voltage supply and an ignition unit for igniting a gas-discharge burner of a gas-discharge lamp, the ballast and the ignition un...
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WO/2009/011097A1 |
A reference voltage source (2) generates a reference voltage (Vdim) for current light control. A first current source (24) generates a first current (I1). A first current mirror circuit (28) has a plurality of output terminals (P1-P3) an...
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WO/2009/010091A1 |
The present invention relates to a circuit arrangement for operation of a discharge lamp (EL) having a rectifier (GL) with a first and a second input connection for coupling to an AC supply voltage and having a first and a second output ...
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WO/2009/007914A1 |
In this method an arc-length control value, indicating the current length of a discharge arc of the gas-discharge lamp (1), is monitored and the lamp (1) is driven in a first operation mode (OMP) with a first current wave-shape when the ...
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WO/2009/008196A1 |
A digital control circuit (16) synchronizes and controls the ON/OFF of semiconductor switching elements (Q11, Q12-Q15) of a step-down chopper (12) and an inverter circuit (13) and controls ON time for the semiconductor switching element ...
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WO/2009/008175A1 |
After startup, a lighting method for a high-pressure discharge lamp is to light the lamp at a rated frequency without switching the frequency for 120 seconds (S12, S13), and thereafter to switch from the rated frequency to a more audible...
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WO/2009/007706A2 |
An electronic ballast (10), for a gas discharge lamp (18), comprises a constant current source (14) and a switch (16). A transformer (60), for use in an igniter (90) for a gas discharge lamp (18, 40), comprises a core (62) which has inte...
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WO/2009/003992A1 |
The invention relates to a circuit arrangement for identifying switch-on sequences for an on/off switch, with a first module (11), which contains a flip-flop (50) for outputting a state signal, wherein a first capacitor (C8) of the first...
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WO/2009/003818A1 |
The invention relates to a detect method for step dimming selection in an electronic ballast including an End of Lamp Life detect circuit and a half-bridge inverter. The End of Lamp Life detect circuit is connected to an input terminal o...
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WO/2009/005736A2 |
A controller for optical transducers uses delta-sigma signal density modulation to reduce electromagnetic interference.
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WO/2009/005535A1 |
A microprocessor controlled electronic ballast for lighting equipment is described wherein light level control is performed by varying the power provided to the light. Lighting power is adjusted by driving the lamp through a resonant cir...
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WO/2009/004871A1 |
A scan lighting system is provided with switching elements (Qp1, Qn1) connected between both terminals of a direct current electric power source to make electric currents flow through a primary winding and a capacitor in a resonance circ...
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WO/2009/001668A1 |
A back light control device (10) supplies PWM control inverter units (3a, 3b) with a PWM signal generated in accordance with a dimmer level input through a receiving unit (2) for receiving infrared, wherein the inverter units (3a, 3b) dr...
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WO/2009/001702A1 |
An electric discharge lamp ignition device is provided with an inverter that is comprised of a transformer having a primary winding and first and second secondary windings, converts a direct current voltage to a high frequency voltage, a...
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WO/2009/001616A1 |
At an early period of a discharge start, a shield electrode is connected with the ground potential through a bidirectional voltage trigger type switch. Subsequently, electric charges in the shield electrode flow through the ground potent...
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WO/2008/156991A1 |
A lighting control circuit for dimming a light is provided with different algorithms that are utilized to dim fluorescent and incandescent lights. Some method of identifying the type of light which is to be dimmed, reports to a control f...
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WO/2008/155913A1 |
A drive device (100) includes an inverter and supplies an AC voltage Vac to CCFL2 as a drive object. A first detection signal generation unit (30a) generates a first detection signal (S1) generated when the first CCFL (2a) is driven by a...
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WO/2008/154797A1 |
A magnetic energy lamp, the fluorescent of which is excited by the electromagnetic induction generated by a built-in magnetic energy generator for lighting, comprises a lamp body (101) in which at least one through or internal hole (104)...
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WO/2008/155714A1 |
The present invention provides a lamp driver, a lighting system and a method. The method comprises the steps of measuring a line voltage; determining a voltage range between two threshold voltages wherein the measured line voltage lies; ...
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WO/2008/156015A1 |
A series circuit having a diode (D1) and a resistor (R1) is connected in parallel to a filament (FL1). A series circuit having a diode (D2) and a resistor (R2) is connected in parallel to a filament (FL2). The filaments (FL1, FL2) are pr...
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WO/2008/151963A1 |
The present invention relates to a circuit configuration having a first (EA1) and a second input connector (EA2) for connecting a supply voltage (Uzw) and at least one first and one second reverse converter module (SWM1, SWM2), each reve...
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WO/2008/151669A1 |
When operating high-pressure discharge lamps, flickering occurs with the excessive formation of electrode tips. With the help of the invention, it is possible to detect the electrode having multiple electrode tips. In this way, interferi...
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WO/2008/148690A1 |
The invention relates to a high-pressure discharge lamp comprising a discharge receptacle (5) inserted in a outer piston (51). An ignition device (137) is built into the lamp, said device containing at least one spiral impulse generator ...
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WO/2008/149275A1 |
A driver circuit (100; 200) for driving a plurality of LEDs (159) comprises: a series arrangement of two controllable switches (111, 112) connected between said two input terminals (117, 118); a controller (116) for alternatively and in ...
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WO/2008/149582A1 |
A backlight lamp lighting controller including a PWM signal generation part (22) for outputting a PWM signal generated based on an externally input duty ratio to an inverter part (24) by means of PWM control for driving to light up a flu...
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WO/2008/149293A1 |
A driver (10) for driving a gas discharge lamp (11) comprises at least two controllable switches (M1, M2) and a controller (12) for controlling the switches. The controller has a first operative state in which one switch (M1) is conducti...
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WO/2008/148725A2 |
The invention relates to a compact high-voltage impulse generator based on a spiral impulse generator which is entirely or partially surrounded by a ferritic material. The invention also relates to a coating method for coating a spiral i...
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WO/2008/148657A1 |
The invention relates to a method for the production of a ceramic spiral pulse generator, comprising the following steps: a) Providing a film composite made of at least one ceramic green film and at least one metal layer, b) winding the ...
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WO/2008/148424A1 |
The invention relates to a high-pressure discharge lamp comprising a discharge vessel (5) especially received in an outer piston (51), an ignition device generating high-voltage impulses in the lamp being built into the lamp. The ignitio...
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WO/2008/147903A1 |
Control of delivery of current through one or more discharge lamps. Methods include alternately switching on and off switching elements that control a fluorescent lamp, in response to receiving input, until the brightness of the lamp dec...
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WO/2008/146974A1 |
Disclosed herein is a hybrid ballast for driving a triode carbon nanotube (CNT) lamp, which is capable of applying a high DC voltage to an anode terminal and applying a bipolar pulse to a gate terminal in a state in which a cathode termi...
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WO/2008/145631A2 |
The invention relates to a compact high-voltage pulse generator based on a spiral pulse generator, wherein the spiral pulse generator is configured as an LTCC component and wound of at least two ceramic foils and metal layers applied the...
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WO/2008/142608A1 |
A self-oscillated half -bridge converter circuit for a fluorescent lamp ballast is presented in this utility model. The self-oscillated half-bridge converter circuit has parallel branches connected between two secondary coils of a transf...
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WO/2008/142943A1 |
An AC conversion circuit which converts DC power into AC power for supply to a discharge tube includes: a main transformer having a primary winding arranged at the AC power side and a secondary winding arranged at the discharge tube side...
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WO/2008/138223A1 |
The invention discloses a dimming control signal transmission circuit of the electronic dimming ballast comprising: a dimming switch circuit, a positive half cycle checkout voltage division circuit, a negative half cycle checkout voltage...
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WO/2008/140330A2 |
A circuit to supply an AC voltage to a fluorescent lamp load from an AC supply converts the supply to DC, boosts the voltage in a converter and then drives an inverter from the smoothed boosted voltage in such a manner that the inverter ...
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WO/2008/139663A1 |
A display device illuminating apparatus (12) is provided with a light source (17) and a light source control means (50) for controlling the light source. The light source control means (50) generates a light source control signal (Vcon) ...
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WO/2008/140932A1 |
A radio frequency (RF) power supply for an electrodeless lamp includes a pair of DC rails, an RF inverter having power input terminals connected between the rails, a first inductor arranged to inductively couple with an electrodeless lam...
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