WO1994015444A1 - Ballast for at least one pair of gas discharge lamps in parallel - Google Patents
Ballast for at least one pair of gas discharge lamps in parallel Download PDFInfo
- Publication number
- WO1994015444A1 WO1994015444A1 PCT/EP1993/002995 EP9302995W WO9415444A1 WO 1994015444 A1 WO1994015444 A1 WO 1994015444A1 EP 9302995 W EP9302995 W EP 9302995W WO 9415444 A1 WO9415444 A1 WO 9415444A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- gas discharge
- discharge lamps
- connection point
- choke
- lamp
- Prior art date
Links
- 239000003990 capacitor Substances 0.000 claims abstract description 30
- 238000004804 winding Methods 0.000 claims abstract description 29
- 238000000926 separation method Methods 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 description 12
- 238000013459 approach Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012544 monitoring process Methods 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
- H05B41/26—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
- 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
- H05B41/382—Controlling the intensity of light during the transitional start-up phase
Definitions
- the invention relates to a ballast for at least one pair of gas discharge lamps operated in parallel according to the preamble of claim 1.
- ballast technology So far it has been assumed in ballast technology that two separate resonant circuits are also required for 2-lamp operation. This is because it has been assumed that when a common resonant circuit is used for both lamps, after the one lamp has been ignited, the resonant circuit voltage breaks down and is no longer sufficient to ignite the second lamp. As a rule, it can be assumed that both lamps are not the same
- the invention has for its object that known ballast
- the ballast according to the invention works with only a single resonant circuit despite the conceptual hindrance described above.
- the cause apparently lies in the effect of the balancing transformer.
- the current flowing through this lamp and the associated winding of the balancing transformer causes a voltage in the other winding which is superimposed on the voltage supplied by the resonant circuit (normally the voltages are compensated for by the two windings of the balancing transformer the opposite direction).
- the above-described superimposition of the voltages on the lamp which has not yet ignited causes the lamp to also ignite.
- the ignition of the lamp can be controlled by monitoring the lamp current. If it is found that after the first lamp has been ignited, the second Lamp does not ignite, so as before, the frequency of the inverter can be lowered to near the resonance frequency of the resonant circuit, with the result that the ignition voltage on the second lamp, which has not yet ignited, is increased. This then usually leads to the ignition of the second lamp.
- ballast An exemplary embodiment of a ballast according to the invention is described below with reference to the single drawing.
- the ballast shown in the drawing has a bridge rectifier G, which is connected to the network. The one generated by the rectifier G.
- the DC voltage is fed to an inverter W R , which has an asymmetrical output.
- the inverter W R is supplied with a DC voltage U DC generated by the rectifier G.
- the inverter W R contains two switch elements connected in opposite directions in a known manner. The switching frequency can be changed. In this way, the inverter WR generates one at its output
- a series resonant circuit is connected, which consists R and a resonant capacitor CR of a choke L.
- the alternating voltage dropping across the resonance capacitor C R is supplied to two pairs of lamps L 1 , L 2 and L 3 , L 4 to be supplied via an isolating capacitor C T.
- the isolating capacitor C T can also be provided between the inverter WR and the reactor LR. It is drawn in dashed lines in the drawing and is drawn with C T with a dash above.
- a first balancing transformer Tsi is provided for the first pair of lamps L 1 , L 2 , which has two windings W S 1 , W S2 acting in the opposite direction. One end of these two windings is connected to the separating capacitor C T
- each of the two windings W S1 , W S2 is connected to an electrode of one of the two lamps L 1 , L 2 .
- the other electrode of the two lamps L 1 , L 2 is connected to ground via a resistor R 1 , R 2 .
- the current flowing through the lamp L 1 generates a voltage drop U L1 across the resistor R 1 , which is used as a measured variable for the lamp current.
- a voltage UL drops 2 which is used as a measured variable for the lamp current of the lamp L2.
- the lamps L 1 and L 2 are heated directly, the two heating filaments being connected by heating capacitors C H1 and C H2 .
- T S2 provided with two windings W S3 , W S4 acting in opposite directions. Again, the two windings are connected at one end, and the
- connection point of the two windings is connected via the isolating capacitor C T to the connection point of the choke L R and the resonance capacitor C R.
- the other ends of the two windings W S3 , W S4 are each connected to one electrode of the two lamps L 3 , L 4 .
- the other electrodes of the two lamps L 3 , L 4 are directly connected here.
- the connection point is with a
- the heating filaments of lamps L 3 , L 4 are heated by means of a heating transformer T H1 , T H2 .
- a heating transformer T H1 , T H2 an input winding W H1, W H4 of the two heating transformers is supplied with a heating voltage U H.
- the heating transformer T H1 has two output windings W H2, W H3 , one of which is connected to a heating coil of the lamp L3.
- the heating transformer T H2 has two output windings W H5, W H6 , each of which is connected to one of the two heating filaments of the lamp L 4 .
- the frequency of the inverter W R is chosen so that it is relatively far above the resonance frequency of the choke L R and the resonant capacitor C R formed series resonant circuit. In this case, the voltage drop across the resonant capacitor C R is relatively small, so that none of the
- Lamp of each lamp pair first.
- the current flowing through the lamp induces in the winding of the corresponding one associated with the other lamp
- Balancing transformer a voltage that is the ignition voltage of the other
- Lamp overlaid with the result that the other lamp also ignites. If the other lamp is not ignited, which can be determined for example in the case of the lamps L 1 , L 2 by the voltages U L1 , U L2 , the frequency of the
- the resonance frequency of the series resonance circuit is approaching. In this way, the ignition of the second lamp is ultimately forced.
- Lamp pairs only a single series resonance circuit is provided. This measure allows the ballast according to the invention to be manufactured more easily and cheaply than previously.
- a single balancing transformer (not shown) with four windings can be provided in the present case, two of which each act in opposite directions.
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE59305294T DE59305294D1 (en) | 1992-12-23 | 1993-10-28 | Ballast for at least one gas discharge lamp pair operated in parallel |
AU53715/94A AU5371594A (en) | 1992-12-23 | 1993-10-28 | Ballast for at least one pair of gas discharge lamps in parallel |
EP93924069A EP0676121B1 (en) | 1992-12-23 | 1993-10-28 | Ballast for at least one pair of gas discharge lamps in parallel |
FI952655A FI111791B (en) | 1992-12-23 | 1995-05-31 | Ballast for at least one pair of parallel discharge gas discharge lamps |
NO952517A NO308690B1 (en) | 1992-12-23 | 1995-06-22 | Drive circuit device for at least one parallel-operated pair of gas discharge lamps |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4243955A DE4243955B4 (en) | 1992-12-23 | 1992-12-23 | Ballast for at least one parallel-operated pair of gas discharge lamps |
DEP4243955.8 | 1992-12-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994015444A1 true WO1994015444A1 (en) | 1994-07-07 |
Family
ID=6476455
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1993/002995 WO1994015444A1 (en) | 1992-12-23 | 1993-10-28 | Ballast for at least one pair of gas discharge lamps in parallel |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP0676121B1 (en) |
AT (1) | ATE148297T1 (en) |
AU (1) | AU5371594A (en) |
DE (2) | DE4243955B4 (en) |
ES (1) | ES2097550T3 (en) |
FI (1) | FI111791B (en) |
NO (1) | NO308690B1 (en) |
WO (1) | WO1994015444A1 (en) |
ZA (1) | ZA939579B (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7309964B2 (en) | 2004-10-01 | 2007-12-18 | Au Optronics Corporation | Floating drive circuit for cold cathode fluorescent lamp |
CN100452940C (en) * | 2000-08-10 | 2009-01-14 | 皇家菲利浦电子有限公司 | Multiple lamp LCD backlight driver with coupled magnetic components |
US9030119B2 (en) | 2010-07-19 | 2015-05-12 | Microsemi Corporation | LED string driver arrangement with non-dissipative current balancer |
USRE46502E1 (en) | 2011-05-03 | 2017-08-01 | Microsemi Corporation | High efficiency LED driving method |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE69524593T2 (en) * | 1995-09-27 | 2002-08-08 | Koninkl Philips Electronics Nv | Ballast with balancing transformer for fluorescent lamps |
CN1085962C (en) * | 1996-06-25 | 2002-06-05 | W·L·戈尔有限公司 | Flexible water and oil resistant composites |
DE19625389A1 (en) * | 1996-06-25 | 1998-01-02 | Gore W L & Ass Gmbh | Flexible composite |
DE19715341C1 (en) * | 1997-04-12 | 1998-10-15 | Vossloh Schwabe Gmbh | Electronic ballast with automatic restart |
DE19715342C1 (en) * | 1997-04-12 | 1998-12-17 | Vossloh Schwabe Gmbh | Ballast for independent parallel operation of low pressure gas discharge lamps |
US6069455A (en) * | 1998-04-15 | 2000-05-30 | Electro-Mag International, Inc. | Ballast having a selectively resonant circuit |
DE10049842A1 (en) | 2000-10-09 | 2002-04-11 | Tridonic Bauelemente | Operating circuit for gas discharge lamps, has additional DC supply line for each gas discharge lamp for preventing unwanted lamp extinction |
DE10134966A1 (en) * | 2001-07-23 | 2003-02-06 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Ballast for operating at least one low-pressure discharge lamp |
DE102007054805A1 (en) * | 2007-11-16 | 2009-05-20 | Tridonicatco Schweiz Ag | Circuit arrangement for operating gas discharge lamps, for example HID lamps |
DE102010063867A1 (en) * | 2010-12-22 | 2012-06-28 | Tridonic Gmbh & Co Kg | Ignition control and ignition detection of gas discharge lamps |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3917850A1 (en) * | 1988-06-02 | 1989-12-07 | Gen Electric | CONTROLLED LEAK TRANSFORMER FOR FLUORESCENT LAMP CONTROL UNITS WITH INTEGRAL BALLAST INDUCTIVES |
US5081401A (en) * | 1990-09-10 | 1992-01-14 | Motorola, Inc. | Driver circuit for a plurality of gas discharge lamps |
EP0490329A1 (en) * | 1990-12-07 | 1992-06-17 | Tridonic Bauelemente GmbH | System for controlling the light intensity and the behaviour of gas discharge lamps |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3412942C2 (en) * | 1984-04-06 | 1986-02-20 | Trilux-Lenze Gmbh + Co Kg, 5760 Arnsberg | Electronic ballast for several fluorescent lamps |
DK339586D0 (en) * | 1986-07-16 | 1986-07-16 | Silver Gruppen Prod As | ELECTRONIC BALLAST |
JPH03116689A (en) * | 1989-09-29 | 1991-05-17 | Toshiba Lighting & Technol Corp | Discharge lamp lighting device |
-
1992
- 1992-12-23 DE DE4243955A patent/DE4243955B4/en not_active Expired - Lifetime
-
1993
- 1993-10-28 ES ES93924069T patent/ES2097550T3/en not_active Expired - Lifetime
- 1993-10-28 AT AT93924069T patent/ATE148297T1/en active
- 1993-10-28 DE DE59305294T patent/DE59305294D1/en not_active Expired - Lifetime
- 1993-10-28 EP EP93924069A patent/EP0676121B1/en not_active Expired - Lifetime
- 1993-10-28 AU AU53715/94A patent/AU5371594A/en not_active Abandoned
- 1993-10-28 WO PCT/EP1993/002995 patent/WO1994015444A1/en active IP Right Grant
- 1993-12-21 ZA ZA939579A patent/ZA939579B/en unknown
-
1995
- 1995-05-31 FI FI952655A patent/FI111791B/en not_active IP Right Cessation
- 1995-06-22 NO NO952517A patent/NO308690B1/en not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3917850A1 (en) * | 1988-06-02 | 1989-12-07 | Gen Electric | CONTROLLED LEAK TRANSFORMER FOR FLUORESCENT LAMP CONTROL UNITS WITH INTEGRAL BALLAST INDUCTIVES |
US5081401A (en) * | 1990-09-10 | 1992-01-14 | Motorola, Inc. | Driver circuit for a plurality of gas discharge lamps |
EP0490329A1 (en) * | 1990-12-07 | 1992-06-17 | Tridonic Bauelemente GmbH | System for controlling the light intensity and the behaviour of gas discharge lamps |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100452940C (en) * | 2000-08-10 | 2009-01-14 | 皇家菲利浦电子有限公司 | Multiple lamp LCD backlight driver with coupled magnetic components |
US7309964B2 (en) | 2004-10-01 | 2007-12-18 | Au Optronics Corporation | Floating drive circuit for cold cathode fluorescent lamp |
US9030119B2 (en) | 2010-07-19 | 2015-05-12 | Microsemi Corporation | LED string driver arrangement with non-dissipative current balancer |
USRE46502E1 (en) | 2011-05-03 | 2017-08-01 | Microsemi Corporation | High efficiency LED driving method |
Also Published As
Publication number | Publication date |
---|---|
NO952517D0 (en) | 1995-06-22 |
FI952655A0 (en) | 1995-05-31 |
ES2097550T3 (en) | 1997-04-01 |
DE59305294D1 (en) | 1997-03-06 |
FI111791B (en) | 2003-09-15 |
ZA939579B (en) | 1994-08-11 |
NO308690B1 (en) | 2000-10-09 |
FI952655A (en) | 1995-05-31 |
DE4243955A1 (en) | 1994-06-30 |
ATE148297T1 (en) | 1997-02-15 |
DE4243955B4 (en) | 2010-11-18 |
NO952517L (en) | 1995-06-22 |
AU5371594A (en) | 1994-07-19 |
EP0676121B1 (en) | 1997-01-22 |
EP0676121A1 (en) | 1995-10-11 |
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