WO2002047442A1 - Electronic ballast with feed-forward control - Google Patents
Electronic ballast with feed-forward control Download PDFInfo
- Publication number
- WO2002047442A1 WO2002047442A1 PCT/IB2001/002312 IB0102312W WO0247442A1 WO 2002047442 A1 WO2002047442 A1 WO 2002047442A1 IB 0102312 W IB0102312 W IB 0102312W WO 0247442 A1 WO0247442 A1 WO 0247442A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- voltage
- resonant tank
- ballast
- converter
- frequency
- Prior art date
Links
- 230000001939 inductive effect Effects 0.000 claims abstract 4
- 238000004804 winding Methods 0.000 claims description 19
- 239000002131 composite material Substances 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 description 19
- 230000000295 complement effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000368 destabilizing effect Effects 0.000 description 1
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
- H05B41/36—Controlling
- H05B41/38—Controlling the intensity of light
- H05B41/39—Controlling the intensity of light continuously
- H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/538—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a push-pull configuration
- H02M7/53803—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a push-pull configuration with automatic control of output voltage or current
-
- 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
- H05B41/2825—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 by means of a bridge converter in the final stage
- H05B41/2827—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 by means of a bridge converter in the final stage using specially adapted components in the load circuit, e.g. feed-back transformers, piezoelectric transformers; using specially adapted load circuit configurations
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0016—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters
- H02M1/0022—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters the disturbance parameters being input voltage fluctuations
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Definitions
- This invention relates to electronic ballasts for discharge lamps such as fluorescent lamps and, in particular, to such ballasts which are useful in applications where compact size is desirable.
- ballast circuitry If the operating frequency of ballast circuitry is increased sufficiently to achieve a substantial reduction in the sizes of magnetic and filtering elements, power losses tend to increase.
- an electronic ballast for discharge lamps which can be made compact without substantially increasing cost or adversely affecting performance.
- an electronic ballast includes a source of power having a varying DC voltage, a self-oscillating converter powered by the DC voltage for producing pulses at a controlled frequency, a resonant tank for converting the pulses to an alternating current for powering a discharge lamp, and a feed-forward control circuit for effecting variation of the frequency in response to variations of the DC voltage, the resonant tank having a voltage drop which varies directly with said frequency.
- Such a ballast does not require a regulated DC power supply and will operate effectively with a filter capacitor that is much reduced in size from capacitors that are typically used to reduce ripple of the rectified DC power.
- FIG. 1 is a combination block and schematic diagram of a system including a ballast in accordance with an embodiment of the invention.
- Figure 2 is a detailed circuit diagram of a system including an exemplary ballast in accordance with the invention.
- Figures 3 A and 3B are waveform diagrams illustrating operation of the exemplary ballast of Figure 2.
- the exemplary system shown in Figure 1 includes a source of AC power S, a discharge lamp L (e.g. a fluorescent lamp) and a ballast for controllably passing power to the lamp from the source S.
- the ballast includes an EMI filter 10, a bridge rectifier DR1, a line- filter capacitor C f , a half-bridge converter 12, a resonant tank 14, a current transformer Tl, a gate driver circuit 16 and a feed-forward control circuit 18.
- the EMI filter 10 serves to isolate the AC power source S from interference signals generated within the ballast (e.g. high-frequency switching signals generated by the converter 12).
- the bridge rectifier DR1 and the filter capacitor C f convert the AC power from the source S to rectified, but unregulated, DC power having a varying DC voltage N f .
- this rectifier and capacitor form a DC power source that is conventional except for its simplicity and the relatively small size of the filter capacitor that is possible because of the ripple compensation provided by the feed-forward control.
- a relatively simple voltage-step-up circuit can be substituted.
- the half-bridge converter 12 (including serially-connected transistors Ql and
- the converter operates together with the resonant tank 14 to provide power to the lamp L.
- the converter switches at a nominal high frequency (e.g. 120 kHz) relative to the frequency (e.g. 60 Hz) of the AC source S and alternately connects the resonant tank 14 (via a node ⁇ ) to the varying DC voltage on the capacitor C f (through transistor Ql) and then to ground (through transistor Q2).
- the resonant tank 14 converts the power provided through transistor Ql (in the form of DC pulses) to a sinusoidal AC waveform for powering the lamp L.
- the tank 14 operates at a resonant frequency which is determined primarily by inductance and capacitance in the tank itself and by the impedance of the lamp L.
- the current transformer Tl senses the current flowing through the resonant tank and supplies a signal I res representative of this current to a first input of the gate driver circuit 16.
- the gate driver applies signals to the gates of the transistors Ql and Q2 to effect switching of these transistors at the same frequency as that of the sinusoidal AC waveform generated within the resonant tank 14.
- control circuit 18 applies a feed-forward signal to a second input of the gate driver 16 to effect an offset of the driving signals applied to the gates, thereby compensating for the variations of the rectified DC supply voltage N f on the line-filter capacitor C f .
- feed-forward control enables compensation for substantially greater variations in the DC supply voltage, without destabilizing the self-oscillating operation of the resonant converter.
- a current-limiting resistor Rl is inserted in series with the AC power source S to limit inrush current through the bridge rectifier DR1 when power is initially applied.
- the EMI filter is formed by a capacitor C2 for bypassing high-frequency interference signals (generated by the high-frequency switching of the half-bridge converter) to ground and by an inductor L2 for blocking passage of the high-frequency interference signals.
- the line filter-capacitor C f reduces the magnitude of the ripple of the rectified AC power supplied to the converter 12. Because of the compensation provided by the feedforward control, the size of this capacitor can be substantially reduced. For example, a circuit having the component values specified in Figure 2 and having a 3.3 ⁇ f capacitor C f was used to power a 28 Watt T8 fluorescent lamp at a nominal voltage of 142 Nolts RMS. Without the feed-forward control, a 22 ⁇ f capacitor C f would be required to power the same lamp or the crest factor would substantially increase.
- the half-bridge converter 12 is substantially identical to that shown in Figure 1, but further includes snubber capacitors C3 and C4 connected in parallel with the respective transistors Ql and Q2. These capacitors serve to reduce energy losses during turn off of the transistors Ql and Q2, as is well known in the art.
- the resonant tank is formed by an inductor LI, by a capacitor C6 in parallel with the lamp L and by the capacitance of the lamp itself.
- the capacitor C5 has an impedance which is very small compared to that of the lamp and functions primarily as a DC blocking impedance, as is well known in the art.
- the current transformer includes windings Tl-1, Tl-2, Tl-3 and Tl-4.
- Winding Tl-1 acts as a primary winding for sensing the current I res flowing through the resonant tank.
- These zener diode pairs serve to convert current signals Iz produced by the windings Tl-2 and Tl-3 to voltage signals Vz for driving the transistors Ql and Q2, respectively.
- one of the transistors Q1/Q2 is ON and the other is OFF.
- Ql is ON and Q2 is OFF.
- I c (t) is determined by the feed-forward control circuit, where:
- ⁇ l, ⁇ 2, N3, N4 are number of turns of the windings Tl-1, Tl-2, Tl-3, and Tl-4, respectively
- the feed-forward control circuit 18 includes complementary first and second circuits for driving the winding Tl-4.
- the first winding-driver circuit includes an NPN transistor Q3, a resistor R3 connected in series with the collector, a diode D3 connected in series with the emitter, and the series combination of a diode Dl and a resistor R5 connected in series between the base of Q3 and a node M.
- the second winding driver circuit includes a PNP transistor Q4, a resistor R4 connected in series with the collector, a diode D4 connected in series with the emitter, and the series combination of a diode D2 and a resistor R6 connected in series between the base of Q3 and the node M.
- Control circuit 18 further includes a bandpass filter which is formed by the serially-connected combination of a resistor R7 and a capacitor C7 (connected between nodes N and M) and by the parallel-connected combination of a capacitor C8 and resistor R8 (connected between node M and ground).
- This bandpass filter serves to convert a square- wave signal produced at node N (and having a voltage alternating between approximately N f and ground) to a triangular-wave signal which is produced at node M.
- This triangular-wave signal has an amplitude proportional to N f and varies substantially symmetrically above and below ground potential.
- the first and second winding-driver circuits operate to produce the control current Ic in the winding Tl-4, which is an alternating triangular- wave current having an instantaneous polarity determined by the polarity of the voltage at the node M.
- FIGS 3 A and 3B illustrate signals produced, during operation of the exemplary ballast shown in Figure 2, for two different values of N f .
- N f the exemplary ballast shown in Figure 2
- the square- wave signal represents the voltage at node ⁇ (which is substantially equal to the voltage N f when the transistor Ql -is conducting); • the triangular- wave signal represents the sum of the magnetizing current I mag and the control current Ic; and
- the feed-forward control circuit 18 cooperates with the gate- driver circuit 16 to vary the switching frequency of the converter 12 in response to variations of the DC voltage N f .
- This is done by producing a contributory drive current through the winding Tl-4 which varies directly with the magnitude of the triangular waveform signal at node M.
- the converter transistors Ql and Q2 change state whenever the sum of the magnetizing current I mag and the control current Ic is equal to the sensed resonant inductor current I s .
- the contributory drive current through winding Tl-4 tends to increase the rate at which the magnetizing current reaches the value of the resonant inductor current.
- the operating frequency of the converter (and thus of the current I res through the resonant tank) varies directly with the amount of the contributory drive current through the winding Tl-4.
- the voltage drop across the resonant inductor LI varies directly with frequency. Consequently, as the voltage N f supplied to the tank 14 by the converter 12 varies, the resonant inductor regulates the voltage supplied to the lamp L by dropping more voltage for higher values of Nf and by dropping less voltage for lower values of N f .
- This causes a lower converter frequency f and a lower voltage drop across the resonant inductor LI.
- FIG. 2 represents only one exemplary embodiment of specific circuitry that may be utilized to implement an electronic ballast in accordance with the invention.
- compactness of the ballast might be further improved by forming the resonant tank with an integral device rather than discrete circuit components.
- One particularly interesting device is a multi-layered piezoelectric transformer, such as that described in U.S. Patent 58344882.
- a fluorescent lamp ballast utilizing such a piezoelectric transformer is described in Ray L. Lin et al., Inductor-less Piezoelectric Transformer Ballast for Linear Fluorescent Lamps, 2000 CPES Power Electronics Seminar Proceedings, 17-19 September 2000.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002549034A JP2004515893A (en) | 2000-12-05 | 2001-12-05 | Electronic ballast with feedforward control |
EP01270085A EP1352546A1 (en) | 2000-12-05 | 2001-12-05 | Electronic ballast with feed-forward control |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/730,430 US6424101B1 (en) | 2000-12-05 | 2000-12-05 | Electronic ballast with feed-forward control |
US09/730,430 | 2000-12-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002047442A1 true WO2002047442A1 (en) | 2002-06-13 |
Family
ID=24935328
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2001/002312 WO2002047442A1 (en) | 2000-12-05 | 2001-12-05 | Electronic ballast with feed-forward control |
Country Status (5)
Country | Link |
---|---|
US (1) | US6424101B1 (en) |
EP (1) | EP1352546A1 (en) |
JP (1) | JP2004515893A (en) |
CN (1) | CN1397150A (en) |
WO (1) | WO2002047442A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8841863B2 (en) | 2008-07-14 | 2014-09-23 | Panasonic Corporation | Lighting apparatus, backlight apparatus |
Families Citing this family (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10235217A1 (en) * | 2002-08-01 | 2004-02-19 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Circuit device for operating lamp, especially low pressure discharge lamp has current limiter that can drive control electrode of at least one transistor switching unit in inverter to limit current |
US7753558B2 (en) | 2002-10-04 | 2010-07-13 | International Rectifier Corporation | Compact fluorescent lamp package |
US7224125B2 (en) * | 2002-10-04 | 2007-05-29 | International Rectifier Corporation | Dimmable fluorescent lamp package |
US7755300B2 (en) * | 2003-09-22 | 2010-07-13 | Mks Instruments, Inc. | Method and apparatus for preventing instabilities in radio-frequency plasma processing |
CA2488768A1 (en) * | 2003-12-03 | 2005-06-03 | Universal Lighting Technologies, Inc. | Lossless circuit for sampling of lamp voltage |
MXPA04012082A (en) * | 2003-12-03 | 2005-07-01 | Universal Lighting Tech Inc | Electronic ballast with adaptive lamp preheat and ignition. |
DE102004016945A1 (en) * | 2004-04-06 | 2005-10-27 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Electronic ballast with control circuit and feedforward control |
DE102005007346A1 (en) * | 2005-02-17 | 2006-08-31 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Circuit arrangement and method for operating gas discharge lamps |
KR101386975B1 (en) * | 2007-07-03 | 2014-04-21 | 페어차일드코리아반도체 주식회사 | Lamp ballast circuit and driving method thereof |
EP2208399B1 (en) * | 2007-11-06 | 2013-04-17 | Tridonic GmbH & Co KG | Operating lighting means |
GB2457085B (en) * | 2008-02-02 | 2010-03-17 | Russell Jacques | Bipolar power control |
US20090200953A1 (en) * | 2008-02-08 | 2009-08-13 | Ray James King | Methods and apparatus for a high power factor ballast having high efficiency during normal operation and during dimming |
NZ584057A (en) * | 2010-03-18 | 2013-02-22 | Intellectual Property Energy Mad Ltd | Load Balance Circuit |
GB2478992B (en) * | 2010-03-26 | 2014-11-19 | Russell Jacques | Regulating controller for controlled self-oscillating converters using bipolar junction transistors |
JP5693048B2 (en) * | 2010-05-31 | 2015-04-01 | キヤノン株式会社 | Current resonance power supply |
US9203326B2 (en) | 2010-06-29 | 2015-12-01 | Eaton Industries Company | Feed forward control for a cyclo-converter |
CN102958263B (en) * | 2011-08-23 | 2016-04-27 | 台达电子企业管理(上海)有限公司 | Electric ballast |
US8624514B2 (en) * | 2012-01-13 | 2014-01-07 | Power Integrations, Inc. | Feed forward imbalance corrector circuit |
DE102012007478B4 (en) * | 2012-04-13 | 2023-08-03 | Tridonic Gmbh & Co Kg | Converter for a light source, LED converter and method for operating a converter |
US9389288B2 (en) | 2012-09-14 | 2016-07-12 | General Electric Company | System and method for maintaining soft switching condition in a gradient coil driver circuit |
CN103840646B (en) * | 2012-11-23 | 2017-03-01 | 南京博兰得电子科技有限公司 | A kind of resonant transformation device |
DE112013006283A5 (en) * | 2012-12-28 | 2015-10-22 | Tridonic Gmbh & Co Kg | Operation of bulbs with a resonant converter |
US9543940B2 (en) * | 2014-07-03 | 2017-01-10 | Transphorm Inc. | Switching circuits having ferrite beads |
CN106329895B (en) * | 2015-06-17 | 2020-10-27 | 雅达电子国际有限公司 | LLC resonant converter and method for suppressing ripple in output voltage thereof |
US9899905B2 (en) * | 2016-06-15 | 2018-02-20 | Det International Holding Limited | Ripple compensation circuit of power supply and compensation method thereof |
JP6968912B2 (en) * | 2018-01-29 | 2021-11-17 | ローム株式会社 | Light emitting element drive control device, light emitting element drive circuit device |
CN111464063A (en) * | 2020-04-29 | 2020-07-28 | 华南理工大学 | Multi-load wireless power transmission system |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4560908A (en) * | 1982-05-27 | 1985-12-24 | North American Philips Corporation | High-frequency oscillator-inverter ballast circuit for discharge lamps |
US4701671A (en) * | 1982-05-27 | 1987-10-20 | North American Philips Corporation | High-frequency oscillator-inverter ballast circuit for discharge lamps |
US6072710A (en) * | 1998-12-28 | 2000-06-06 | Philips Electronics North America Corporation | Regulated self-oscillating resonant converter with current feedback |
Family Cites Families (11)
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US5402043A (en) | 1978-03-20 | 1995-03-28 | Nilssen; Ole K. | Controlled driven series-resonant ballast |
US5365152A (en) * | 1991-09-09 | 1994-11-15 | Matsushita Electric Industrial Co. Ltd. | Apparatus for controlling the power to a discharge-lamp |
DE4301276A1 (en) * | 1993-01-19 | 1994-07-21 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Method and power supply unit for the stabilized operation of a sodium high-pressure discharge lamp |
US5382882A (en) | 1993-04-20 | 1995-01-17 | General Electric Company | Power supply circuit for a gas discharge lamp |
US5872429A (en) * | 1995-03-31 | 1999-02-16 | Philips Electronics North America Corporation | Coded communication system and method for controlling an electric lamp |
US5834882A (en) | 1996-12-11 | 1998-11-10 | Face International Corp. | Multi-layer piezoelectric transformer |
US5856728A (en) | 1997-02-28 | 1999-01-05 | Motorola Inc. | Power transformer circuit with resonator |
JP2001504986A (en) | 1997-09-01 | 2001-04-10 | コーニンクレッカ、フィリップス、エレクトロニクス、エヌ、ヴィ | Circuit layout |
US6034484A (en) | 1997-10-15 | 2000-03-07 | Korea Tronix Co., Ltd. | Piezoelectronic ballast for fluorescent lamp |
US6052300A (en) | 1998-11-09 | 2000-04-18 | Face International Corporation | DC-AC converter circuit using resonating multi-layer piezoelectric transformer |
US6172466B1 (en) * | 1999-02-12 | 2001-01-09 | The Hong Kong University Of Science And Technology | Phase-controlled dimmable ballast |
-
2000
- 2000-12-05 US US09/730,430 patent/US6424101B1/en not_active Expired - Fee Related
-
2001
- 2001-12-05 CN CN01804478A patent/CN1397150A/en active Pending
- 2001-12-05 WO PCT/IB2001/002312 patent/WO2002047442A1/en not_active Application Discontinuation
- 2001-12-05 JP JP2002549034A patent/JP2004515893A/en not_active Abandoned
- 2001-12-05 EP EP01270085A patent/EP1352546A1/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4560908A (en) * | 1982-05-27 | 1985-12-24 | North American Philips Corporation | High-frequency oscillator-inverter ballast circuit for discharge lamps |
US4701671A (en) * | 1982-05-27 | 1987-10-20 | North American Philips Corporation | High-frequency oscillator-inverter ballast circuit for discharge lamps |
US6072710A (en) * | 1998-12-28 | 2000-06-06 | Philips Electronics North America Corporation | Regulated self-oscillating resonant converter with current feedback |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8841863B2 (en) | 2008-07-14 | 2014-09-23 | Panasonic Corporation | Lighting apparatus, backlight apparatus |
Also Published As
Publication number | Publication date |
---|---|
EP1352546A1 (en) | 2003-10-15 |
JP2004515893A (en) | 2004-05-27 |
US6424101B1 (en) | 2002-07-23 |
CN1397150A (en) | 2003-02-12 |
US20020067139A1 (en) | 2002-06-06 |
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