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WO/2008/032855A1 |
In order to provide an illuminating lamp control method and apparatus capable of concurrently realizing energy saving technologies and life extension technologies on an illuminating lamp, there is provided an illuminating lamp control me...
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WO/2008/033219A2 |
A ballast (20) for powering one or more gas discharge lamps (70,72,74,76) comprises an inverter (200), an output circuit (300), and an arc protection circuit (400). Arc protection circuit (400) monitors an electrical signal within the ou...
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WO/2008/029344A1 |
A lamp driver circuit (400) comprises a feedback circuit for controlling stable operation of a discharge lamp (La), e.g. an inductively coupled discharge lamp such as a molecular radiation lamp, and for controlling a light output level o...
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WO/2008/029108A1 |
A variable load circuit (2) is provided for use with a dimmer (1). A low wattage load such as a LED (3) is provided in series with the dimmer and the variable load circuit is provided in parallel with the LED. The variable load circuit h...
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WO/2008/030751A2 |
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 inducto...
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WO/2008/029445A1 |
A discharge lamp light apparatus, which uses the dielectric barrier discharge, comprises a lighting circuit (20) that applies a high frequency voltage having a rectangular waveform to a discharge lamp (10) to vary a time ratio of lightin...
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WO/2008/029655A1 |
In order to improve stability of a discharge lamp during a light-adjusted ON period even if the light output is lowered, a DC superposition circuit (1) superposes DC voltage on AC voltage applied to a fluorescent lamp (FL). A light adjus...
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WO/2008/026508A1 |
[PROBLEMS] To provide a light source driving circuit board which can drive a light source with sufficiently high light source characteristics even under the conditions where an environmental temperature change is large, and to provide a ...
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WO/2008/023522A1 |
A minimum lamp voltage detection means which is equipped with one output power characteristic curve for supplying a constant power for the rated lamp voltage range of a discharge lamp and with a plurality of output power characteristic c...
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WO/2008/023341A2 |
An automatic dimming range recognition method for an electronic ballast including reading a control signal 802; determining whether the control signal is greater than control signal max 804; setting the control signal max to the control ...
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WO/2008/023483A1 |
To optimally control a power outputted by a discharge lamp lighting apparatus (1) for each of a plurality of connected discharge lamps (11) that exhibit different loads because of the respective different gas components contained in the ...
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WO/2008/023476A1 |
A lighting apparatus comprises a power converting circuit (3) that includes a plurality of switching elements (Q2-Q6) and an inductance element (L2) and that power converts an input from a DC power supply (2) and then supplies it as a re...
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WO/2008/020366A2 |
The invention describes a method of driving a discharge lamp (1), wherein a blackening value (N) is determined, which blackening value (N) represents a level of blackening of the interior of the lamp (1), and a recovery parameter (2, T) ...
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WO/2008/022270A2 |
A method and apparatus for controlling an input voltage to a light emitting diode (LED) is disclosed. In one embodiment a system for controlling an input voltage to at least one LED includes an energy storage device. The energy storage d...
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WO/2008/019481A1 |
The present invention provides an illumination apparatus comprising one or more first light-emitting elements and one or more second light-emitting elements and a control system configured to control the operation of the one or more firs...
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WO/2008/019531A1 |
A high-frequency generator includes a direct current - direct current conversion unit which is used for converting input direct current voltage to high voltage direct current, and high frequency oscillation output unit which is used for ...
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WO/2008/020202A1 |
A lighting device (201) for ionising surrounding air while producing light. The device comprises a housing having a pair of electrical connectors (403, 404, 405, 406) at each of two opposing ends of the housing, a tubular outer wall (202...
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WO/2008/020582A1 |
A long-life ultra-high pressure mercury lamp in which flickering is eliminated by varying the magnitude of a superposition pulse depending on the variation of parameters in a light-emitting tube. In an ultra-high pressure mercury lamp co...
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WO/2008/017980A2 |
Methods of driving a gas discharge lamp (1). In a first method, a value of voltage (Ul) across the gas discharge lamp (1) is determined, then a correction function (Kd) representing the dependency of light flux on a discharge arc length ...
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WO/2008/018895A2 |
Flashing lights powered by a common wild frequency power source (40) are synchronized with respect to flash rate and duration. Each lighthead includes a power supply device (1 ), which includes a timing signal generator (30) and a synchr...
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WO/2008/018558A1 |
A compact fluorescent lamp not inviting an increase of the size of the chalk coil and leading to power saving. A compact fluorescent lamp comprises a luminescent tube having a glass tube constituting a one electric discharge path and ele...
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WO/2008/017199A1 |
A fluorescent lamp system for converting T8 type fluorescent lamp to T5 includes a ballast (2) of T8 type fluorescent lamp, a bracket (20) of a T8 type fluorescent lamp and a T5 type lamp. The T5 type lamp includes a bracket (31) and a f...
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WO/2008/015831A1 |
An illumination device for a display device has cold cathode tube lamps (1) capable of being parallelly driven, a first holding member (3) having holders (2) equivalent in number to the number of the cold cathode tube lamps (1) and each ...
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WO/2008/014632A1 |
A technique for providing control for an electronic ballast by responding to the current in the common bus (DC power rail) between a boost circuit such as a power factor circuit (PFC) and an output (such as a high frequency (HF) inverter...
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WO/2008/015600A1 |
The present invention provides a method and circuit for accurately controlling heating of an electrode of a discharge lamp. According to the present invention a feedback voltage is generated. The feedback voltage is representative of an ...
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WO/2008/015602A1 |
The method according to the present invention relates to controlling a gas discharge lamp during a pre-heating period of said lamp, wherein a first terminal of a control circuit is connected with a first electrode of the lamp and a secon...
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WO/2008/015200A1 |
The invention relates to a circuit arrangement for operating at least one discharge lamp (La) having an input connection for connecting a supply voltage, an output connection for connecting the at least one discharge lamp (La), an electr...
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WO/2008/014803A1 |
An electronic ballast (12), which is known per se, for a lamp (14) which is designed for continuous filament pre-heating is used, according to the invention, in an environment in which the temperature is -20° C or less. When driving the...
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WO/2008/014942A1 |
A monitoring device for monitoring at least one fluorescent lamp, particularly in areas at risk of explosion, which fluorescent lamp has a lamp tube with electrodes arranged on the ends thereof in the form of coils, and lamp sockets assi...
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WO/2008/015805A1 |
A display device illuminating device is composed of a tube lamp which can be driven in parallel by power supplied from a power supply device through a first power supply member and a second power supply member; the first power supply mem...
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WO/2008/012942A1 |
Provided is a light adjusting noise reduction circuit in which the vibration noise accompanying turning ON/OFF of a piezoelectric transformer. A full bridge circuit (2) is controlled by a full bridge drive circuit (5) so as to switch an ...
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WO/2008/013185A1 |
A discharge lamp operating system includes a first discharge lamp operation circuit and a second discharge lamp operation circuit. The first discharge lamp operation circuit includes a first and a second primary winding, a first secondar...
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WO/2008/011904A1 |
High-pressure discharge lamp, with an outer bulb (10), on which a first terminal (12) and a second terminal (14) are provided, and with a discharge vessel (16), which is accommodated in the outer bulb (10), with a first and a second term...
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WO/2008/011794A1 |
A hot cathode electronic ballast filament control device includes : a tube (1), a semi bridge driving circuit (2), and an electronic rectifier control integrated circuit (3). There is an inductor L and a resonance capacitor C2 connected ...
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WO/2008/011041A2 |
A ballast control circuit for driving at least one gas discharge lamp (14) in accordance with an embodiment of the present applicatio includes a high side driver operable to provide a high side driving signal to a high side switch (MHS) ...
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WO/2008/010351A1 |
A discharge lamp lighting device comprising a first series circuit section constituted by connecting a primary coil and a capacitor in series, a second series circuit section constituted by connecting a discharge lamp in series with a se...
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WO/2008/011238A2 |
The output current of a ballast is dynamically limited when an over-temperature condition is detected in the ballast according to one of (i) a step function or (ii) a combination of step and continuous functions, so as to reduce the temp...
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WO/2008/010542A1 |
A super-high pressure mercury lamp in which wear of electrode is reduced even when the temperature of an electrode on the opening side of the reflector of a light emitting tube rises higher than the temperature of an electrode on the nec...
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WO/2008/007310A2 |
The invention provides a current balancing circuit for powering a first load with a negative dynamic resistance and a second load with an essentially different negative dynamic resistance, and a transformer with such turns ratio that at ...
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WO/2008/006024A2 |
An apparatus and method for igniting a lamp during a strike mode of an inverter comprising: sequentially controlling a duty cycle sweep and a frequency sweep of driving signals in the inverter to provide an increasing output voltage to t...
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WO/2008/006091A2 |
A method and electronic circuit for driving multiple backlight lamps by means of DC switching, that is, current switching with single DC high voltage source. The inverter of the present invention does not need any transformers, because i...
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WO/2008/001245A1 |
A method is described for detecting defective operation of a discharge lamp (7). The method comprises the steps of determining the lamp impedance and establishing that the lamp is operating in an incandescent mode if it is found that the...
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WO/2008/001519A1 |
An electric discharge lamp device (La) in which periods (HF1, HF2) during which it outputs a high-frequency voltage for allowing a resonance circuit to resonate and periods (FB1, FB2) during which it outputs a rectangular wave voltage ar...
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WO/2008/001506A1 |
A dimmer noise reducing circuit of piezoelectric transformer wherein vibration noise accompanying the activation/deactivation of a piezoelectric transformer can be reduced, while non-uniformity of brightness as in a liquid crystal displa...
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WO/2008/003036A2 |
One embodiment relates to a complex quantitative media performance metric spectral display system (200). The system displays a spectral color that accurately represents a complex quantitative value of a media performance metric. The syst...
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WO/2008/002162A1 |
The method of brightness control of fluorescent lamp is executed on the basis of the make-time of a dimmer. That make- time of a dimmer is transformed into a digital signal, having higher frequency than power frequency. The current inten...
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WO/2007/147512A1 |
The invention relates to an operating device (BG) for lamps (LM), comprising an interface (IFi), by means of which the device (BG) may be provided with external dimming values. The device (BG) converts said provided external dimming valu...
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WO/2007/148273A1 |
A glow starter switch for discharge lamp operation has a first starter electrode (40) and a second starter electrode (41) arranged in an envelope (42) filled with an inert gas. The first starter electrode comprises a bimetallic material ...
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WO/2007/148166A1 |
A portable communication device (10) includes an image capture device (36), a light source unit (38) operable to provide a flash of light and a flash ignition device (40). The flash ignition device (40) includes a light emitting diode (L...
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WO/2007/147725A1 |
This invention relates to a method for detecting the real cutting off signal of BJT (bipolar junction transistor) in an electronic ballast and the corresponding electronic ballast. Said electronic ballast comprises a half-bridge circuit ...
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