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公开(公告)号：EP0912993B1
公开(公告)日：2004-08-18
申请号：EP98904347.6
申请日：1998-03-12
IPC分类号： H01J61/18
CPC分类号： H01J61/125 , H01J61/22 , H01J61/827
摘要： The invention relates to a metal halide lamp which radiates light with a color temperature Tc of between 3900 K and 4200 K and with a general color rendering index Ra ≥ 90. The ionizable metal halide filling comprises between 30 and 50 mole % CaI2. A lamp can be realized thereby having a limited crest factor, and accordingly a long useful life.
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公开(公告)号：EP1440604A1
公开(公告)日：2004-07-28
申请号：EP02775101.5
申请日：2002-10-16
IPC分类号： H05B33/08
CPC分类号： H05B33/0869 , G09G3/3406 , Y10S362/80
摘要： Apparatus for controlling an RBG based LED luminary which measures the output signals of filtered photodiodes and unfiltered photodiodes and correlates these values to chromaticity coordinates for each of the red, green and blue LEDs of the luminary. Forward currents driving the LED luminary are adjusted in accordance with differences between the chromaticity coordinates of each of the red, green and blue LEDs and chromaticity coordinates of a desired mixed color light.
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公开(公告)号：EP0960432B1
公开(公告)日：2004-07-14
申请号：EP98955870.5
申请日：1998-12-07
IPC分类号： H01J61/36
CPC分类号： H01J61/363
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34.发明公开METHOD FOR COLOR MIXING OF HID LAMPS OPERATED AT VHF FREQUENCIES USING DUTY CYCLE MODULATION 审中-公开METHOD FOR混色与占空比调制放电的高频供电灯高强度
公开(公告)号：EP1423993A1
公开(公告)日：2004-06-02
申请号：EP02753173.0
申请日：2002-08-02
发明人： SHEN, Eric, B.
IPC分类号： H05B41/292 , H05B41/392
CPC分类号： H05B41/3928 , H05B41/2928 , Y02B20/202 , Y02B20/208
摘要： A method of color mixing a very high frequency operated HID lamp which effectuates power modulation to the HID lamp at a frequency of the second longitudinal acoustic mode by modulating the duty cycle of a half bridge configured resonant inverter. The duty cycle is modulated with a modulation frequency which is substantially one-half the frequency of the second longitudinal acoustic mode of the HID lamp. In operation, exciting the second longitudinal acoustic mode of the HID lamp with the half bridge configured resonant inverter operated with a modulated duty cycle achieves color mixing along a vertical axis of the HID lamp.
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公开(公告)号：EP1419677A1
公开(公告)日：2004-05-19
申请号：EP02755492.2
申请日：2002-08-14
发明人： SHEN, Eric, B.
IPC分类号： H05B41/292 , H05B41/392
CPC分类号： H05B41/3928 , H05B41/2928 , Y02B20/202 , Y02B20/208
摘要： A method of color mixing with arc stability and arc straightening of HID lamps operated at high frequencies which modulates a duty cycle of a half bridge configured resonant inverter at a frequency which is substantially one-half the frequency of a frequency of a second longitudinal acoustic mode of the HID lamp. The method also sweeps the switching frequency in a high frequency range of such resonant inverter. The duty cycle modulation effectuates power modulation to create a fixed frequency power component which is substantially equal to the frequency of the second longitudinal acoustic mode. The sweeping switching frequency of the half bridge configured resonant inverter drives the HID lamp in a manner which effectuates arc stability and arc straightening.
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36.发明授权DETECTION CIRCUIT FOR DETECTING ARC INSTABILITIES OF A HIGH INTENSITY DISCHARGE LAMP 有权用于检测不稳定性电路在电弧放电强度强
公开(公告)号：EP0978222B1
公开(公告)日：2004-03-24
申请号：EP98944150.6
申请日：1998-10-01
IPC分类号： H05B41/288
CPC分类号： H05B41/2928
摘要： A circuit for detecting arc instabilities in a high pressure gas discharge lamp. The circuit has rectifier means and a low pass filter to obtain from the lamp voltage a quasi-rms voltage having recurrent periods with first zones containing spurious noise from switching of inverter switches and broad second zones, between the first zones, which are substantially free of spurious noise. The quasi-rms voltage is sampled only during the second zones, so that the samples have a high information-to-noise ratio. The sample signal may be used in a variety of methods to detect and control arc instabilities in gas discharge lamps.
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公开(公告)号：EP1072171B1
公开(公告)日：2004-03-17
申请号：EP99962268.1
申请日：1999-12-24
IPC分类号： H05B41/00
CPC分类号： H05B41/042
摘要： The invention relates to a circuit arrangement for igniting and operating a high-pressure discharge lamp, provided with: input terminals for the connection of a supply source, output terminals for the connection of the lamp, switching means for operating the lamp at a nominal lamp voltage Vla during stable lamp operation, and for generating an open voltage Vo at the output terminals before the lamp is ignited, a control circuit for controlling the switching means provided with means BM for limiting the voltage at the output terminals. According to the invention, the circuit arrangement comprises means M for detecting the transition from a glow discharge to an arc discharge.
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公开(公告)号：EP1142452B1
公开(公告)日：2004-03-10
申请号：EP00972733.0
申请日：2000-10-10
发明人： CHANG, Chin
CPC分类号： H05B33/0821 , F21W2107/00 , F21W2111/02 , H05B33/089 , Y10S362/80
摘要： A lighting system comprising a plurality of light-emitting diodes and a current driver for driving current through a plurality of parallel disposed, electrically conductive branches, wherein the branches comprise at least one cell. In each cell, each branch has a light-emitting diode with an anode terminal and a cathode terminal. The anode terminal of each light-emitting diode is coupled to the cathode terminal of a light-emitting diode of an adjacent branch via a shunt. The shunt further comprises a light-emitting diode. In each cell, each light-emitting diode may have a different forward voltage characteristic, while still insuring that all of the light-emitting diodes in the arrangement have the same brightness. Upon failure of one light-emitting diode, the remaining light-emitting diodes in the lighting system are not extinguished.
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公开(公告)号：EP1393600A1
公开(公告)日：2004-03-03
申请号：EP02727906.6
申请日：2002-05-15
发明人： SHEN, Eric, B.
IPC分类号： H05B41/00
CPC分类号： H05B41/28 , H05B41/2853 , Y02B20/186
摘要： A high power factor electronic ballast for a gas discharge lamp is disclosed which can provide bus voltage control in response to varying load conditions without the need for direct sensing of the load conditions. The electronic ballast includes an input stage; an output stage; a slow loop controller configured to regulate the bus voltage to a constant value during steady state operation; a hysteresis band over voltage protection (OVP) controller for maintaining the bus voltage in a predetermined hysteresis voltage band during open circuit and pre-ignition conditions; and an on-time limiting controller for guaranteeing a minimum on-time for the input stage. The electronic ballast further includes at least one DC bus capacitor for storing energy created from energy imbalances between the input and output stage. The novel construction makes it possible to regulate the bus voltage to a constant value under steady state conditions using the slow loop controller, and to prevent the bus voltage from increasing in an uncontrolled manner under open circuit and pre-ignition conditions using the over voltage protection controller. This is advantageously achieved without having to directly sense the load condition.
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公开(公告)号：EP1380191A1
公开(公告)日：2004-01-14
申请号：EP02718455.5
申请日：2002-04-02
IPC分类号： H05B33/08
CPC分类号： H05B33/086 , H05B33/0869
摘要： A light output (11) control system for implementing a method for sensing the tri-stimulus values (30a) for controlling a light output (11) illuminated from an LED based luminary (10) is disclosed. The system comprises one or more filter/photo diode sensors for sensing a first set of tri-stimulus values (30a) of the light output (11) and providing signals (CS1-CS3) indicative thereof. The signals are utilized in a transformation matrix (32) whereby a second set of tri-stimulus values (30a) is obtained. The system (60) controls the light output (11) as a function of the second set of tri-stimulus values (30a).
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