EP1886541A2 - Circuit arrangement for operating a discharge lamp having temperature compensation - Google Patents
Circuit arrangement for operating a discharge lamp having temperature compensationInfo
- Publication number
- EP1886541A2 EP1886541A2 EP06761647A EP06761647A EP1886541A2 EP 1886541 A2 EP1886541 A2 EP 1886541A2 EP 06761647 A EP06761647 A EP 06761647A EP 06761647 A EP06761647 A EP 06761647A EP 1886541 A2 EP1886541 A2 EP 1886541A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- temperature
- circuit
- discharge lamp
- dependent
- circuit arrangement
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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
- H05B41/2856—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against internal abnormal circuit conditions
Definitions
- the invention relates to a circuit arrangement for operating a discharge lamp.
- the conventional electronic ballast with a circuit arrangement for operating a low-pressure discharge lamp is dispensed with an active control of the lamp power regardless of the input voltage.
- the lamp in the case of mains undervoltage, the lamp has a lower power consumption and a lower luminous flux, but in the case of mains overvoltage a higher power consumption and a higher luminous flux than when operating with rated mains voltage. Since the power consumption of the lamp is not regulated, changes in the above-mentioned thermally induced change in the burning voltage of Output current of the electric ballast. An increased output current in turn leads to a rise in temperature of the lamp and thus to a further decrease in the operating voltage. This positive feedback amplifies the effect of the decrease in internal combustion voltage with increasing ambient temperature.
- An increasing ambient temperature thus causes an increase in the currents in the lamp or in the circuit arrangement, which has increased losses and thus a further heating of the components of the electrical ballast result. It can lead to thermal overloads of the system or individual components.
- inexpensive components should be usable.
- power-determining components of the circuit arrangement are designed to be temperature-dependent that the power consumption of the lamp is limited with increasing temperature.
- chokes for example, the use of a ferrite material with a low Curie temperature can be used to achieve the desired effect; for ceramic capacitances, a ceramic material with a temperature-dependent dielectric constant can be used.
- power-determining components may be those components which have an influence on the operating frequency with which the lamp is operated, whereby the current which is applied to the lamp is influenced.
- the circuit according to EP 0 781 077 B1 is a circuit arrangement for operating a discharge lamp, in particular a
- Low-pressure discharge lamp with a load circuit having at least one current-limiting Resonanzindukt technically and at least one capacitor, and with a free-running inverter, which is designed as a half or full bridge circuit with at least two switching elements.
- the circuit arrangement further has a drive circuit for driving the switching elements, which has an LC parallel resonant circuit which consists of a capacitance and an inductance discharging this capacitance.
- the LC parallel resonant circuit is parallel to a branch which forms the switching path between the control and reference electrodes of a switching element, wherein the current-limiting Resonanzindukt technically the load circuit carries an auxiliary winding which is galvanically connected to the LC parallel resonant circuit via a resistor.
- Both the capacitance and the inductance of the LC parallel resonant circuit can now be temperature-dependent.
- Either a temperature-dependent capacitor can be used for the capacitance or for the inductance a temperature-dependent throttle or both.
- the full capacity or inductance is not designed to be temperature-dependent.
- the capacitance may consist of two capacitors, of which one capacitor is temperature-independent and the second is temperature-dependent.
- the same is possible with the throttle, it can be provided for realizing the inductance two throttles, one of which is temperature-independent and the other is temperature-dependent.
- the components are each in series with each other.
- the frequency of the LC parallel resonant circuit changes depending on the temperature. Accordingly, the driving of the entire circuit is temperature-dependent, and the operating frequency of the circuit increases with temperature, and the currents in the components of the circuit become smaller, the current in the lamp is smaller and the thermal load of the system is limited.
- the circuit arrangement according to EP 0 530 603 B1 is a circuit arrangement for operating a discharge lamp, in particular a low-pressure discharge lamp, with a load circuit having at least one current-limiting resonance inductance and at least one capacitor, and with a free-running inverter, which is designed as a half-bridge circuit with at least two switching elements , And with a drive circuit for driving the switching elements, wherein the drive circuit has an RC element.
- the resistance of the RC element is in this case the one which is galvanically connected to an auxiliary winding carried by the current-limiting resonance inductance of the load circuit.
- the RC element also influences the operating frequency with its low-pass behavior, so that the capacitance can also be temperature-dependent. Again, it is possible to provide two capacitors in series, one of which is temperature-independent and the other is temperature-dependent.
- FIG. 2 shows a first modification of the circuit arrangement according to FIG. 1,
- FIG. 3 shows a second modification of the circuit arrangement according to FIG. 1,
- FIG. 4 shows the temperature behavior of a capacitor which consists of two series-connected capacitors, one of which is approximately linearly temperature-dependent, and Figure 5 shows the behavior of the operating frequency, which is determined by the capacity of Figure 4.
- FIG. 1 The circuit arrangement shown in FIG. 1 for operating a low-pressure discharge lamp EL is known from EP 0 781 077 B1.
- This is a half-bridge arrangement with two transistors T1 and T2, which are controlled by a common drive circuit AS.
- This drive circuit consists of a secondary winding HW1 on a current limiting the lamp current inductor L1, which via a resistor R2 a parallel resonant circuit C2a, L2a excites.
- the alternating voltage which is applied by this parallel resonant circuit to the control inputs of the complementary half-bridge transistors, leads to an alternating switching on of the two transistors T1 and T2, whereby the voltage applied to the capacitor C1 DC voltage in a known manner in a high-frequency AC voltage to supply the load circuit (consisting of C5 , C6, C7, C8, KL, EL, R3 and L1) is transformed.
- the LC parallel resonant circuit of C2a and L2a is thus galvanically connected to the energy input from the load circuit to the auxiliary winding HW1 via the resistor R2.
- TS The element designated here with TS need not be described in detail. It is a start-up circuit used to start the self-oscillating oscillation.
- the operating frequency at which the resonant circuit is fed is strongly dependent on the natural resonant frequency of the resonant circuit consisting of C2a and L2a.
- the components C2a and L2a are thus power-determining components, because the natural resonance frequency over the Operating frequency of the circuit affects the current with which the lamp EL is applied.
- the capacitance C2a or the inductance L2a is now temperature-dependent.
- the capacitance or the inductance should decrease and thus the natural resonance frequency of the parallel resonant circuit increase.
- the operating frequency of the circuit arrangement and thus the AC resistance of the lamp inductor L1 increases with increasing temperature.
- the currents in the components of the circuit arrangement and in the lamp thereby become smaller, and the thermal load of the system is limited.
- the capacitance consists of two capacitors C2 and C3, of which the capacitor C2 has a temperature-independent value which corresponds approximately to the maximum value of the capacity desired at minimum temperature.
- the second capacitor C3 should have a significantly greater value than the capacitor C2 at lower temperature, so that the total capacitance of the series circuit of C2 and C3 is defined essentially by the size of C2. As the temperature rises, the capacitance of C3 should be much smaller, which reduces the total capacity of the series circuit. At maximum temperature, the capacity should reach a minimum value.
- FIG. 5 shows the dependence of the natural resonant frequency of the parallel resonant circuit of the above-mentioned type on the temperature of the capacitor C3.
- the temperature only has a noticeable influence on the resonance frequency from about 50 ° to 60 ° Celsius.
- the change in the resonant frequency is particularly clear.
- the inductance L2a may also be formed such that it consists of two inductors L2 and L3 in series, as well this is shown in FIG.
- One of the chokes, L2 has a temperature independent value approximately equal to the minimum value desired at maximum temperature.
- the second throttle L3 should have such a value at low temperature, with which the
- both the capacitance C2a and the inductance L2a each consist of temperature-dependent elements in series with temperature-independent elements.
- the use of the circuit of EP 0 781 077 B1 is only an example and serves to explain what is meant by power-determining component.
- the circuit arrangement according to EP 0 530 603 B1 is identical in essential parts with the circuit arrangement from EP 0 781 077 B1 shown here with reference to the circuit arrangement shown in FIG. 1, wherein the choke L2a is to be omitted in the drive circuit.
- the invention also provides for this circuit, the capacity of the drive circuit form temperature-dependent. This can be done in particular on the basis of two capacitors, which are connected in series, one of which is highly temperature-dependent and the other is independent of temperature.
- power-determining component in the sense of the invention does not mean every component which has a marginal effect on the power, but components which are suitable for noticeably influencing the power consumption of the lamp in the case of a temperature-dependent design, thus affecting a visible effect to cause the temperature control.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005025154A DE102005025154A1 (en) | 2005-06-01 | 2005-06-01 | Circuit arrangement for operating a discharge lamp with temperature compensation |
PCT/DE2006/000932 WO2006128435A2 (en) | 2005-06-01 | 2006-05-31 | Circuit arrangement for operating a discharge lamp having temperature compensation |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1886541A2 true EP1886541A2 (en) | 2008-02-13 |
EP1886541B1 EP1886541B1 (en) | 2010-02-17 |
Family
ID=36930323
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06761647A Expired - Fee Related EP1886541B1 (en) | 2005-06-01 | 2006-05-31 | Circuit arrangement for operating a discharge lamp having temperature compensation |
Country Status (6)
Country | Link |
---|---|
US (1) | US7911148B2 (en) |
EP (1) | EP1886541B1 (en) |
CN (1) | CN101189919B (en) |
CA (1) | CA2610473A1 (en) |
DE (2) | DE102005025154A1 (en) |
WO (1) | WO2006128435A2 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008086892A1 (en) * | 2007-01-17 | 2008-07-24 | Osram Gesellschaft mit beschränkter Haftung | Circuit arrangement and method for starting and operating one or more discharge lamps |
JP5216086B2 (en) * | 2007-07-16 | 2013-06-19 | オスラム ゲーエムベーハー | Circuit apparatus and method for operating a discharge lamp |
US7817453B2 (en) * | 2007-08-27 | 2010-10-19 | General Electric Company | Thermal foldback for linear fluorescent lamp ballasts |
US8080949B2 (en) * | 2008-03-10 | 2011-12-20 | The Hong Kong Polytechnic University | HID ballast with integrated voltage multiplier and lamp temperature compensation |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1591218A1 (en) * | 1967-03-09 | 1970-12-17 | Junghans Gmbh Geb | Crystal-controlled transistor oscillator |
DE3441992A1 (en) * | 1984-11-16 | 1986-05-22 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH, 8000 München | CIRCUIT ARRANGEMENT FOR IGNITING A LOW-PRESSURE DISCHARGE LAMP |
CH677571A5 (en) * | 1988-11-24 | 1991-05-31 | Skyline Holding Ag | |
DE4129430A1 (en) * | 1991-09-04 | 1993-03-11 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | CIRCUIT ARRANGEMENT FOR OPERATING A LAMP |
DE4238409A1 (en) * | 1992-11-13 | 1994-05-19 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Circuit arrangement for operating low-pressure discharge lamps |
DE4430397A1 (en) * | 1994-08-26 | 1996-02-29 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Circuit arrangement for operating low-pressure discharge lamps |
DE19548506A1 (en) | 1995-12-22 | 1997-06-26 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Circuit arrangement for operating a lamp |
FI101186B (en) * | 1996-12-16 | 1998-04-30 | Helvar Oy | Electronic connection device provided with heat protection circuit |
DE19751063A1 (en) * | 1997-11-18 | 1999-05-20 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Free-running oscillator circuit with simple start-up circuit |
US6157142A (en) * | 1998-10-15 | 2000-12-05 | Electro-Mag International, Inc. | Hid ballast circuit with arc stabilization |
DE102004007006A1 (en) * | 2004-02-12 | 2005-08-25 | Lamptronic International Gmbh & Co.Kg | Temperature-controlled electronic circuit for starting and running fluorescent lamps, uses temperature sensor in circuit reducing power at higher temperatures |
-
2005
- 2005-06-01 DE DE102005025154A patent/DE102005025154A1/en not_active Withdrawn
-
2006
- 2006-05-31 CA CA002610473A patent/CA2610473A1/en not_active Abandoned
- 2006-05-31 US US11/921,470 patent/US7911148B2/en not_active Expired - Fee Related
- 2006-05-31 EP EP06761647A patent/EP1886541B1/en not_active Expired - Fee Related
- 2006-05-31 WO PCT/DE2006/000932 patent/WO2006128435A2/en active Application Filing
- 2006-05-31 DE DE502006006181T patent/DE502006006181D1/en active Active
- 2006-05-31 CN CN200680019450.9A patent/CN101189919B/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2006128435A2 * |
Also Published As
Publication number | Publication date |
---|---|
US20090121645A1 (en) | 2009-05-14 |
DE102005025154A1 (en) | 2006-12-07 |
CA2610473A1 (en) | 2006-12-07 |
CN101189919A (en) | 2008-05-28 |
CN101189919B (en) | 2012-03-21 |
US7911148B2 (en) | 2011-03-22 |
WO2006128435A2 (en) | 2006-12-07 |
WO2006128435A3 (en) | 2007-03-29 |
EP1886541B1 (en) | 2010-02-17 |
DE502006006181D1 (en) | 2010-04-01 |
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