WO2002021884A2 - Ballast circuit for operating a discharge lamp - Google Patents
Ballast circuit for operating a discharge lamp Download PDFInfo
- Publication number
- WO2002021884A2 WO2002021884A2 PCT/JP2001/007680 JP0107680W WO0221884A2 WO 2002021884 A2 WO2002021884 A2 WO 2002021884A2 JP 0107680 W JP0107680 W JP 0107680W WO 0221884 A2 WO0221884 A2 WO 0221884A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- voltage
- capacitor
- lamp
- circuit
- series
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
- H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
- H05B41/282—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices
- H05B41/285—Arrangements for protecting lamps or circuits against abnormal operating conditions
- H05B41/2851—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
- H05B41/2855—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against abnormal lamp operating conditions
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
- H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
- H05B41/295—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps with preheating electrodes, e.g. for fluorescent lamps
- H05B41/298—Arrangements for protecting lamps or circuits against abnormal operating conditions
- H05B41/2981—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
- H05B41/2985—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against abnormal lamp operating conditions
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S315/00—Electric lamp and discharge devices: systems
- Y10S315/04—Dimming circuit for fluorescent lamps
Definitions
- the present invention relates to a ballast circuit for operating a discharge lamp, and more particularly to an electronic discharge lamp ballast having a circuit protection against an end of lamp-life condition.
- the prior art electronic ballasts are designed to detect the end of lamp life and restrict the ballast operation once the end of life is detected.
- a typical example of the electronic ballast having such protection is disclosed in Japanese patent publication No JP11 -31594.
- the ballast of this publication utilizes a voltage detector which detects a lamp voltage, i.e., a voltage across the lamp for determination of whether the lamp voltage exceeds a predetermined threshold as indicative of that the lamp reaches the end of life.
- the detector of the ballast is required to withstand a high voltage applied at the start of the lamp and therefore has to adopt resistors and like elements capable of withstanding the high-voltage, resulting in increased cost of the ballast and a somewhat bulky assembly.
- the problem is solved in another prior art, i.e., U.S. Patent No. 5,925,990 in which the detector is arranged to detect a voltage across a capacitor which is inserted in the ballast in series with the discharge lamp.
- the detector has to be configured to derive a variation width of the voltage appearing across the capacitor in order to determine the end of lamp life. This scheme of detecting the lamp life end requires a rather complicated circuit arrangement with an attendant increase in manufacturing cost.
- both output terminals for the discharge lamp are always made to have a high potential relative to a ground line of the ballast circuit, which requires an additional hazard protection of avoiding electric shocks when replacing the discharge lamp.
- the present invention has been accomplished to provide a ballast circuit for the discharge lamp which is capable of protecting the circuit when the lamp reaches its end of life with a simple and cost effective circuit arrangement, yet assuring a safe lamp replacement.
- the ballast circuit in accordance with the present invention comprises a DC voltage supply providing a driving DC voltage, a pair of first and second inverter switches, and a series resonant circuit generating, and applying a high frequency resonant voltage to the discharge lamp.
- the first and second inverter switches are connected in series across the DC voltage supply and are driven to turn on and off alternately.
- the first inverter switches defines a high-side switch and the second inverter switch defines a low-side switch having one end connected to a ground line of the ballast circuit.
- the resonant circuit is composed of an inductor and a capacitor, and is connected across the second inverter switch through a blocking capacitor so as to generate the high frequency resonant voltage in response to the alternate turn on and off of the first and second inverter switches.
- the capacitor of the resonant circuit is adapted to be connected across the discharge lamp for applying the resonant voltage thereto.
- a voltage comparator is provided to detect a DC voltage appearing in the ballast circuit as a consequence of the discharge lamp reaching its lamp-life-end, and compares the detected DC voltage with a predetermined threshold and generates a lamp-life-end signal when the DC voltage exceeds the threshold.
- a controller Connected to the voltage comparator is a controller which receives the lamp-life-end signal and controls the first and second inverter switches in order to reduce or stop an output power being fed to the discharge lamp.
- the feature of the present invention resides in that a DC sensing capacitor is connected in series with a resistor and the blocking capacitor across the second inverter switch in order to detect the DC voltage, and that the DC sensing capacitor is connected in series with the resistor and the inductor of the resonant circuit across the capacitor of the resonant circuit with one end of the DC sensing capacitor being connected to the ground line of the ballast circuit. Since the DC sensing capacitor is connected in series with the blocking capacitor outside of the resonant circuit, it can be kept free from the high voltage being generated by the resonant circuit and applied to the lamp at the start of the lamp.
- the DC sensing capacitor and its associated parts have not to withstand the high voltage and therefore can be of less cost for reducing the manufacturing cost of the ballast.
- the DC sensing capacitor is connected in parallel with the capacitor of the resonant circuit with the one end of the DC sensing capacitor being connected to the ground line of the ballast circuit, the DC voltage detected at the DC sensing capacitor itself can directly indicate whether or not the lamp reaches the end of life, i.e., simply by comparing the DC voltage itself with the threshold and not requiring to evaluate a variation width of the detected voltage, thereby simplifying the circuit arrangement for determining the lamp life end also for reducing the manufacturing cost, in addition that the one end of the discharge lamp can be held at the ground potential for reducing safety hazard at the time of replacing the lamp.
- the ballast circuit may be designed to operate at least two discharge lamps.
- the ballast circuit includes at least two series resonant circuit each composed of an inductor and a capacitor, and connected in series with a blocking capacitor across the second inverter switch.
- the at least two resonant circuits are connected in parallel with each other across the second inverter switch for providing the resulting resonant voltage.
- the capacitor of each resonant circuit is adapted to be connected across each of the discharge lamp.
- Also included in the ballast circuit are at least two DC sensing capacitors each connected in series with a resistor and each of the blocking capacitors across the second inverter switch.
- the voltage comparator is connected to the at least two DC sensing capacitors and provide the lamp-life-end signal when the DC voltage detected at any one of the DC sensing capacitors exceeds the threshold.
- the resonant circuits are connected in series commonly with the blocking capacitor across the second inverter switch.
- a single DC sensing capacitor is connected in series with a resistor and the common blocking capacitor across the second inverter switch, and provided the DC voltage indicative of whether or not any one of the lamps reaches the end of life.
- only one DC sensing capacitor is sufficient for determination of the lamp-life-end for any one of the discharge lamps, simplifying the circuit design.
- a bypass resistor is connected in series with the blocking capacitor across the first inverter switch in order to detect the lamp-life-end due to a slow-leak of a gas from the discharge lamp.
- the bypass resistor allows the blocking capacitor to release a current through the second inverter switch, the DC voltage supply and the bypass resistor, thereby accumulating the DC voltage across the DC sensing capacitor.
- the lamp-life-end can be successfully detected by the presence of the DC voltage across the DC sensing capacitor.
- the ballast circuit of the present invention is preferred to include an inverter controller which drives the first and second inverter switches to turn on and off at a varying frequency.
- the ballast circuit may include a dimmer controller which generates a dimming signal in response to an external dimmer command, and a frequency controller which varies the frequency of the inverter controller in response to the dimmer signal for adding a dimming control of the lamp.
- FIG. 1 is a circuit diagram of a ballast circuit for operating a discharge lamp in accordance with a preferred embodiment of the present invention
- FIG. 2 is a circuit diagram of a modified ballast circuit
- FIG. 3 is a circuit diagram of a ballast circuit in accordance with another preferred embodiment of the present invention.
- FIG. 4 is a circuit diagram of a modified ballast circuit of the embodiment of
- the ballast circuit includes a DC voltage supply 10 providing a constant DC voltage, and a pair of first and second inverter switches 21 and 22 which are connected in series across the DC voltage supply 10 and are driven by a driver 24 to turn on and off alternately under the control of an inverter controller 25.
- the first inverter switch 11 defines a high-side switch
- the second inverter switch 12 defines a low-side switch with its one end connected to a ground line of the circuit.
- a series resonant circuit composed of an inductor 31 and a capacitor 32 which are connected in series with a blocking capacitor 26 across the second inverter switch 12 with one end of the capacitor 32 connected to the ground line. It is this capacitor 36 across which the discharge lamp 40 is connected to be supplied with a high frequency resonant voltage generated by the alternate turn on and off of the first and second switches 11 and 12.
- a DC sensing capacitor 51 is connected in series with a resistor 52 and the blocking capacitor 26 across the second inverter switch 12.
- the voltage sensed across the DC sensing capacitor 51 is fed to a voltage comparator 53 which compares the sensed voltage with one of predetermined positive and negative thresholds and gives a lamp-life-end signal when the sensed positive DC voltage exceeds the positive threshold or lowers below the negative threshold.
- the inverter controller 25 Upon receiving the lamp life end signal from the voltage comparator 53, the inverter controller 25 responds to control the first and second inverter switches in order to lower or stop providing the output power to the discharge lamp 40.
- the DC sensing capacitor 51 In a normal operating condition, there appears across the DC sensing capacitor 51 an AC voltage in a square wave form symmetrical around zero volt and having a peak voltage which is 1/2 of the DC voltage supplied from the DC voltage source 10 when the first and second inverter switches are driven at a duty ratio of 1/2. Therefore, no DC voltage is accumulated into the DC sensing capacitor 51.
- the capacitor 51 and the resistor 52 may be selected to give a time constant which is sufficiently long with respect to the operating frequency of the inverter switches such that only substantially zero voltage appears across the DC sensing capacitor 51 while the circuit is in the normal operating condition.
- the capacitor 51 is charged to accumulate the DC voltage corresponding to shifting amount of the AC voltage applied across the capacitor relative to the zero voltage level.
- the resulting DC voltage is compared at the comparator 53 with one of the positive and negative thresholds so that the comparator 53 issues the lamp-life-end signal indicating that the lamp reaches its end of lamp life condition.
- the inverter controller 25 Upon occurrence of the lamp-life-end signal, the inverter controller 25 responds to restrict or cease the switching operation of the first and second inverter switches, thereby lowering or ceasing the output power being fed to the discharge lamp and therefore protecting the circuit from the excessive current which would otherwise flow through the circuit.
- the DC sensing capacitor 51 and the resistor 52 responsible for sensing the DC voltage are connected in circuit outside of the resonant circuit of inductor 30 and capacitor 31 , these components can be substantially intact from a high voltage developed at the resonant circuit at the start of the lamp and therefore be cost effective. Further, because of that the one end of capacitor 31 which defines one terminal for connection with the lamp 40 is kept at the ground potential, the ballast circuit can be safe enough when replacing the lamp and is advantageous for home use.
- the ballast circuit additionally includes a frequency controller 61 and a dimmer controller 62 which has a terminal 63 receiving an external dimmer i signal of varying voltage.
- the frequency controller 61 acts to vary the operating frequency, i.e., frequency at which the first and second inverter switches are turned on and off for dimming the lamp.
- the first and second inverter switches 21 and 22 are driven at even duty ration so that, even when the operating frequency of the switches varies for the dimming purpose, the capacitance across the blocking capacitor 26 remains constant while the lamp is in the normal operation condition, enabling a consistent detection of the end of lamp life.
- FIG. 2 shows a modified ballast circuit which is identical to the above embodiment except that a bypass resistor 54 is connected in series with the blocking capacitor 26 across the first inverter switch 11 and at the same time connected in series with the resistor 52 and the DC sensing capacitor 51.
- the bypass resistor 54 is added for the purpose of detecting the lamp life end due to a slow leak of the lamp 40.
- the slow leak is typically caused by a pin-hole in the envelop of the lamp and results in not sustaining the lamp discharge.
- the blocking capacitor 26 discharges, at a timing of the second inverter switch 12 being turned on, through a path of the switch 12, the DC voltage supply 10, and the bypass resistor 54 so as to develop across the blocking capacitor 26 a DC voltage component which in turn charges the DC sensing capacitor 51 through the resistor 52.
- the voltage comparator 53 responds to output the lamp-life-end signal in order to limit or stop supplying the output power for protection of the ballast circuit.
- FIG. 3 shows a ballast circuit in accordance with another preferred embodiment of the present invention which is similar to the above embodiment except that the circuit is designed to operate two lamps and is provided with two resonant circuits.
- the first resonant circuit is composed of an inductor 30-1 and a capacitor 31-1 which are connected in series with a blocking diode 26-1 across the second inverter switch 22, while the second resonant circuit is composed of an inductor 30-2 and a capacitor 31-2 connected in series with a blocking diode 26-2 also across the second inverter switch 22.
- the capacitors 31-1 and 31-2 are connected respectively across the lamps 40 with one ends of the capacitors being connected to the ground line.
- two DC voltage sensing networks each composed of a DC voltage sensing capacitor 51-1 , 51-2 and a resistor 52-1 , 52-2 which are connected in series with a blocking capacitor 26-1 , 26-2 across the second inverter switch 22 with the DC voltage sensing capacitor having its one end connected to the ground line of the circuit.
- a bypass resistor 54-1 , 54-2 is connected in series with the blocking capacitor 26-1 , 26-2 across the first inverter switch 21.
- a voltage comparator 53 is connected to receive the voltage appearing across each of the DC sensing capacitors 51-1 , 51-2 and issues the lamp-life-end signal when the DC voltage sensed at any of the capacitor exceeds the positive threshold or goes below the negative threshold.
- an inverter controller 25 Upon receiving the lamp-life-end signal, an inverter controller 25 responds to actuate the driver 24 for limiting or ceasing the output power being fed to the lamps, thereby protecting the ballast circuit from the otherwise generated excessive current.
- FIG. 4 shows a modified ballast circuit which is identical to the embodiment of FIG. 3 but is arranged to utilize a single DC voltage sensing network instead of the two networks in operating the two lamps 40. Like parts are designated by like reference numerals.
- two resonant circuits each composed of inductor 30-1 , 30-2 and capacitor 31-1 , 31-2 are connected in series with the common blocking capacitor 26 across the second inverter switch 22, and a single DC voltage sensing network is composed of the DC sensing capacitor 51 and resistor 52 connected in series with the blocking capacitor 26 across the second inverter switch 22.
- the only one bypass resistor 54 is utilized to be connected in series with the common blocking capacitor 26 across the first inverter switch 21 in order to detect the end of lamp life due to the slow leak of the lamp.
- the voltage comparator 53 can detect the end of lamp life end for each of the two lamps with the use of the single DC voltage sensing network composed of capacitor 51 and resistor 52.
- the lamp may be any suitable gas discharge lamp including a fluorescent lamp.
- the ballast circuit is additionally equipped with a conventional preheating circuit for preheating the filaments of the lamp.
- the ballast circuit of the above embodiments and modifications could be modified to operate more than two lamps which is still in the scope of the present invention. This application is based upon and claims the priority of Japanese Patent Application No.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/362,689 US6696798B2 (en) | 2000-09-06 | 2001-09-05 | Ballast circuit for operating a discharge lamp |
DE10196562T DE10196562B4 (en) | 2000-09-06 | 2001-09-05 | Ballast for the operation of a discharge lamp |
AU2001284425A AU2001284425A1 (en) | 2000-09-06 | 2001-09-05 | Ballast circuit for operating a discharge lamp |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000270458A JP3797079B2 (en) | 2000-09-06 | 2000-09-06 | Discharge lamp lighting device |
JP2000-270458 | 2000-09-06 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2002021884A2 true WO2002021884A2 (en) | 2002-03-14 |
WO2002021884A3 WO2002021884A3 (en) | 2002-05-10 |
Family
ID=18756893
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2001/007680 WO2002021884A2 (en) | 2000-09-06 | 2001-09-05 | Ballast circuit for operating a discharge lamp |
Country Status (6)
Country | Link |
---|---|
US (1) | US6696798B2 (en) |
JP (1) | JP3797079B2 (en) |
CN (1) | CN1312964C (en) |
AU (1) | AU2001284425A1 (en) |
DE (1) | DE10196562B4 (en) |
WO (1) | WO2002021884A2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1343360A2 (en) * | 2002-03-05 | 2003-09-10 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Circuit for operating a discharge lamp with early EOL recognition |
Families Citing this family (22)
Publication number | Priority date | Publication date | Assignee | Title |
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US7116063B2 (en) * | 2003-07-28 | 2006-10-03 | Matsushita Electric Works, Ltd. | Dimmable discharge lamp lighting device |
MXPA04012081A (en) * | 2003-12-03 | 2005-07-01 | Universal Lighting Tech Inc | High efficiency 4-lamp instant start ballast. |
JP4244893B2 (en) * | 2004-09-14 | 2009-03-25 | セイコーエプソン株式会社 | Lighting of discharge lamp by frequency control |
JP4665480B2 (en) * | 2004-10-26 | 2011-04-06 | パナソニック電工株式会社 | Discharge lamp lighting device, lighting fixture, and lighting system |
US7102297B2 (en) * | 2005-03-31 | 2006-09-05 | Osram Sylvania, Inc. | Ballast with end-of-lamp-life protection circuit |
DE202005013675U1 (en) * | 2005-08-30 | 2005-12-15 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Electronic fluorescent lamp ballast for discharge lamps, has end-of-life monitoring circuit and differential amplifier, where reference current along with current at which asymmetrical performance is detected is applied to amplifier |
US20070281571A1 (en) * | 2006-05-31 | 2007-12-06 | Zippy Technology Corp. | Control method for pre-warning an aging electric discharge lamp |
JP4608470B2 (en) * | 2006-08-31 | 2011-01-12 | パナソニック電工株式会社 | Discharge lamp lighting device and lighting device |
JP4925886B2 (en) * | 2007-03-26 | 2012-05-09 | 三菱電機株式会社 | Discharge lamp lighting device and lighting fixture |
US7560871B2 (en) * | 2007-04-12 | 2009-07-14 | Osram Sylvania, Inc. | Ballast with socket-to-fixture voltage limiting |
US8018700B2 (en) * | 2007-08-27 | 2011-09-13 | General Electric Company | Risk of shock protection circuit |
JP5152970B2 (en) * | 2007-12-19 | 2013-02-27 | パナソニック株式会社 | Lighting device |
JP5081078B2 (en) * | 2008-06-25 | 2012-11-21 | パナソニック株式会社 | Discharge lamp lighting device and lighting apparatus using the same |
DE102009004852A1 (en) * | 2009-01-16 | 2010-07-29 | Osram Gesellschaft mit beschränkter Haftung | Detector circuit and method for controlling a fluorescent lamp |
DE102009004851A1 (en) * | 2009-01-16 | 2010-07-29 | Osram Gesellschaft mit beschränkter Haftung | Detector circuit and method for controlling a fluorescent lamp |
US8482213B1 (en) | 2009-06-29 | 2013-07-09 | Panasonic Corporation | Electronic ballast with pulse detection circuit for lamp end of life and output short protection |
CA2782871C (en) | 2009-11-02 | 2019-02-12 | Genesys Systems, Llc | Electronic ballast circuit for lamps |
US8310161B2 (en) * | 2010-08-27 | 2012-11-13 | Osram Sylvania Inc. | End of life indicator for lamps |
US8384310B2 (en) * | 2010-10-08 | 2013-02-26 | General Electric Company | End-of-life circuit for fluorescent lamp ballasts |
US8564216B1 (en) | 2011-02-02 | 2013-10-22 | Universal Lighting Technologies, Inc. | Asymmetric end-of-life protection circuit for fluorescent lamp ballasts |
US8947020B1 (en) | 2011-11-17 | 2015-02-03 | Universal Lighting Technologies, Inc. | End of life control for parallel lamp ballast |
BR112021003019A2 (en) * | 2019-03-27 | 2021-05-11 | Huawei Technologies Co., Ltd. | wireless charging transmission apparatus, transmission method, and wireless charging system |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3401653A1 (en) * | 1983-01-20 | 1984-07-26 | Zumtobel Ag, Dornbirn | Invertor circuit for operating gas-discharge lamps |
EP0681414A2 (en) * | 1994-05-03 | 1995-11-08 | Osram Sylvania Inc. | Protection circuit for arc discharge lamps |
WO1999034647A1 (en) * | 1997-12-23 | 1999-07-08 | Tridonic Bauelemente Gmbh | Method and device for detecting the rectification effect occurring in a gas-discharge lamp |
US6023132A (en) * | 1997-06-20 | 2000-02-08 | Energy Savings, Inc. | Electronic ballast deriving auxilliary power from lamp output |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5493180A (en) * | 1995-03-31 | 1996-02-20 | Energy Savings, Inc., A Delaware Corporation | Lamp protective, electronic ballast |
JPH1131594A (en) | 1997-07-10 | 1999-02-02 | Toshiba Lighting & Technol Corp | Discharge lamp lighting device, and lighting system |
US5883473A (en) * | 1997-12-03 | 1999-03-16 | Motorola Inc. | Electronic Ballast with inverter protection circuit |
US5925990A (en) | 1997-12-19 | 1999-07-20 | Energy Savings, Inc. | Microprocessor controlled electronic ballast |
JP3603643B2 (en) * | 1999-02-15 | 2004-12-22 | 松下電工株式会社 | Discharge lamp lighting device |
-
2000
- 2000-09-06 JP JP2000270458A patent/JP3797079B2/en not_active Expired - Fee Related
-
2001
- 2001-09-05 CN CNB018152120A patent/CN1312964C/en not_active Expired - Fee Related
- 2001-09-05 AU AU2001284425A patent/AU2001284425A1/en not_active Abandoned
- 2001-09-05 WO PCT/JP2001/007680 patent/WO2002021884A2/en active Application Filing
- 2001-09-05 DE DE10196562T patent/DE10196562B4/en not_active Expired - Fee Related
- 2001-09-05 US US10/362,689 patent/US6696798B2/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3401653A1 (en) * | 1983-01-20 | 1984-07-26 | Zumtobel Ag, Dornbirn | Invertor circuit for operating gas-discharge lamps |
EP0681414A2 (en) * | 1994-05-03 | 1995-11-08 | Osram Sylvania Inc. | Protection circuit for arc discharge lamps |
US6023132A (en) * | 1997-06-20 | 2000-02-08 | Energy Savings, Inc. | Electronic ballast deriving auxilliary power from lamp output |
WO1999034647A1 (en) * | 1997-12-23 | 1999-07-08 | Tridonic Bauelemente Gmbh | Method and device for detecting the rectification effect occurring in a gas-discharge lamp |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1343360A2 (en) * | 2002-03-05 | 2003-09-10 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Circuit for operating a discharge lamp with early EOL recognition |
EP1343360A3 (en) * | 2002-03-05 | 2011-03-09 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Circuit for operating a discharge lamp with early EOL recognition |
Also Published As
Publication number | Publication date |
---|---|
CN1312964C (en) | 2007-04-25 |
US20030168997A1 (en) | 2003-09-11 |
US6696798B2 (en) | 2004-02-24 |
DE10196562B4 (en) | 2010-09-09 |
AU2001284425A1 (en) | 2002-03-22 |
DE10196562T1 (en) | 2003-08-07 |
CN1483301A (en) | 2004-03-17 |
WO2002021884A3 (en) | 2002-05-10 |
JP2002083699A (en) | 2002-03-22 |
JP3797079B2 (en) | 2006-07-12 |
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