EP2719259A1 - Verfahren zum betreiben eines elektronischen vorschaltgeräts für ein leuchtmittel und elektronisches vorschaltgerät - Google Patents
Verfahren zum betreiben eines elektronischen vorschaltgeräts für ein leuchtmittel und elektronisches vorschaltgerätInfo
- Publication number
- EP2719259A1 EP2719259A1 EP12735185.6A EP12735185A EP2719259A1 EP 2719259 A1 EP2719259 A1 EP 2719259A1 EP 12735185 A EP12735185 A EP 12735185A EP 2719259 A1 EP2719259 A1 EP 2719259A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electronic ballast
- input voltage
- vin
- reference value
- output power
- 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
- H05B41/2853—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against abnormal power supply 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
- H05B41/282—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 present invention relates to a method for operating an electronic ballast for a light source, such as a gas discharge lamp or light emitting diode (LED), as well as a correspondingly designed electronic ballast.
- a light source such as a gas discharge lamp or light emitting diode (LED)
- LED light emitting diode
- Electronic ballasts are usually used for certain bulbs, such as gas discharge lamps or light emitting diodes, to reliably start or ignite the light source and to operate with optimum efficiency and the best possible light output.
- the electronic ballasts are designed such that they operate the respective lighting means with the respectively suitable frequency, wherein in addition the current supplied to the lighting means is limited.
- Modern electronic ballasts usually have a circuit for power factor correction (“PFC”) and can also be equipped with a variety of additional functions, in particular various monitoring functions or dimming functions.
- PFC power factor correction
- electronic ballasts may be provided with an overvoltage monitoring, wherein the supply voltage supplied to the electronic ballast is monitored and a warning signal is generated in the event that it exceeds a predetermined reference value.
- ITG Intelligent Temperature Guard
- the present invention is therefore an object of the invention to provide a method for operating an electronic ballast and a correspondingly designed electronic ballast, whereby a reliable operation of the electronic ballast over the widest possible temperature range can be achieved.
- the input voltage of the electronic ballast or a variable representing the input voltage is monitored and compared with a reference value, the reference value representing a still tolerable minimum value for the input voltage of the electronic ballast. If an undershooting of this reference value or threshold value is detected, the electronic ballast is activated in such a way that the power output to the lighting means is reduced and thus the lighting means is dimmed accordingly.
- the invention is based on the finding that the components of an electronic ballast heat up more strongly at low voltages, so that safety problems at low input voltage values can be avoided by lowering the output power of the electronic ballast in the previously described undervoltage case.
- the problem occurring in electronic ballasts of the so-called triangular temperature, ie occurring at the electronic ballast highest temperature, with a high dimming level and a maximum ambient temperature is based on the finding that the components of an electronic ballast heat up more strongly at low voltages, so that safety problems at low input voltage values can be avoided by lowering the output power of the electronic ballast in the previously described undervoltage case.
- the problem occurring in electronic ballasts of the so-called triangular temperature ie occurring at the electronic ballast highest temperature, with a high dimming level and a maximum ambient temperature.
- the electronic ballast can be operated at relatively low temperatures despite low input voltage with maximum output power, or the electronic ballast can generate light even at very low input voltages with at least low output power (for example, unbalanced load).
- operating parameters of the luminous means in particular the current or the voltage of the luminous means, can also be evaluated and used in adjusting the output power of the electronic ballast, i. be taken into account when setting the dimming level, so that indirectly, the lamp temperature can be considered.
- the input voltage can be detected both directly and derived from other operating parameters of the electronic ballast, in particular from operating parameters of a power factor correction circuit of the ballast.
- the invention is generally suitable for use in electronic ballasts for operation with any lighting means, such as, in particular, gas discharge lamps, halogen incandescent lamps or light emitting diodes.
- Fig. 1 shows a block diagram of an electronic ballast according to a preferred embodiment of the present invention
- Fig. 2 shows various characteristics which may be provided in the case of the electronic ballast shown in Fig. 1 upon detection of too low an input voltage for adjusting the output power of the electronic ballast.
- FIG. 1 shows schematically an exemplary embodiment of an electronic ballast 9 according to the invention for operation with a luminous means 10, for example a gas discharge lamp.
- the electronic ballast 9 is connected on the input side via a high-frequency filter 1 to a (not shown) supply voltage source.
- the output of the high-frequency filter 1 is connected to a rectifier circuit 2, which converts the supply voltage into a rectified voltage, with which a power factor correction circuit 3 is operated, which is provided for smoothing and harmonic filtering.
- the power factor correction circuit 3 in the form of a boost converter or boost converter with a smoothing capacitor C1, an inductance L, a controllable switch S1 of a diode D and an output-side storage capacitor C2 configured.
- the power factor correction circuit 3 comprises a measuring circuit with resistors R1 and R2, with the aid of which, depending on the operating phase of the power factor correction circuit 3, one of the output voltage at the capacitor C2 corresponding measured variable or the current through the inductance L corresponding measured variable and a preferably in the form of a in - Integrated circuit, in particular in the form of an ASIC ("Application Specific Integrated Circuit") trained control unit 4 is supplied.
- the control unit 4 controls the switch S1, which can be designed as a MOS field-effect transistor, in such a way that it is switched on and off alternately at specific times.
- the intermediate circuit voltage applied to the capacitor C2 is fed to an inverter 5, which comprises two controllable switches S2 and S3 arranged in a half-bridge circuit.
- the switches S2 and S3 are in turn preferably designed as MOS field-effect transistors.
- control circuit 7 which is preferably formed as an ASIC.
- an undervoltage monitoring functionality is integrated with respect to the input voltage Vin of the electronic ballast, which will be explained in more detail below.
- the control circuit 7 is supplied with a measured variable representing the input voltage Vin of the electronic ballast 9.
- the control circuit 7 can detect the input voltage 7 directly or else indirectly from the voltage applied to the power factor correction circuit 3 or from the aforementioned measurement information obtained with the aid of the voltage divider formed by the resistors R1 and R2 in the power factor correction circuit 3, derive, as indicated by dashed lines in Fig. 1.
- control circuit 7 detects that the monitored input voltage Vin reaches or falls below a predetermined reference value, is controlled by the control circuit of the inverter 5 and the switches S2 and S3 such that the output to the load circuit 6 and the lamp 10 output power is reduced, which has a corresponding dimming of the bulb 10 result.
- this undervoltage detection can be combined with further input parameters, which are also evaluated by the control circuit 7, in order to ensure sufficient performance of the electronic ballast 9 over a wide temperature range.
- the undervoltage monitoring can be combined with a monitoring of the ambient temperature T of the electronic ballast, for which purpose a temperature sensor 8 is provided which can be arranged directly on the control circuit 7 or also externally of the electronic ballast 9.
- the temperature sensor 8 detects a value representing the ambient temperature T of the electronic ballast and feeds it to the control circuit 7, so that the control circuit 7 can detect the inverter 5 not only as a function of the input voltage but also as a function of the temperature when an undervoltage condition is detected, in particular the drive of the inverter is carried out according to a stored in the control circuit 7 characteristic which is dependent both on the input voltage Vin and on the temperature T. This will be explained in more detail below with reference to FIG. 2.
- FIG. 2 shows by way of example a dimming characteristic curve a for the inverter 5 which is dependent on the input voltage Vin, the output power P being plotted as a percentage of the maximum output power via the input voltage Vin indicated by its effective value Vrms.
- V1 an undervoltage reference value
- the Inverter 5 controlled such that the output to the light emitting means 10 output power of the characteristic a is reduced accordingly to dim the illuminant down to a dimming level DL.
- the characteristic curve used in each case is selected depending on the ambient temperature.
- Two further characteristic curves b and c are shown by way of example in FIG.
- the characteristic curve a can correspond, for example, to an ambient temperature of 60 ° C., whereby the associated low-voltage reference value V1 can be at 190V.
- the characteristic curve b may for example be associated with an ambient temperature of 25 ° C., whereby the corresponding undervoltage reference value V 2 may be at 170V.
- the characteristic curve c can finally correspond, for example, to an ambient temperature of -25 ° C., whereby the corresponding undervoltage reference value V3 can be at 150V.
- the characteristic control can be such that the electronic ballast even at very low input voltage still generates light, for example, unbalanced load.
- V4 which may be of the order of 40V, for example
- the dimming level DL corresponds, for example, to an output power in the range of a few percent of the maximum output power can.
- control circuit 7 can also evaluate further parameters in order to take account of additional operating cases.
- the control circuit can also evaluate the voltage V L or the current I L of the luminous means, these parameters, which in particular allow conclusions about the temperature of the luminous means 10, to be made available to the control circuit 7 by the load circuit 6.
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102011103638A DE102011103638A1 (de) | 2011-06-08 | 2011-06-08 | Verfahren zum Betreiben eines elektronischen Vorschaltgeräts für ein Leuchtmittel und elektronisches Vorschaltgerät |
| PCT/AT2012/000156 WO2012167292A1 (de) | 2011-06-08 | 2012-06-06 | Verfahren zum betreiben eines elektronischen vorschaltgeräts für ein leuchtmittel und elektronisches vorschaltgerät |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2719259A1 true EP2719259A1 (de) | 2014-04-16 |
| EP2719259B1 EP2719259B1 (de) | 2019-10-30 |
Family
ID=46513598
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP12735185.6A Active EP2719259B1 (de) | 2011-06-08 | 2012-06-06 | Verfahren zum betreiben eines elektronischen vorschaltgeräts für ein leuchtmittel und elektronisches vorschaltgerät |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2719259B1 (de) |
| DE (1) | DE102011103638A1 (de) |
| WO (1) | WO2012167292A1 (de) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013215652A1 (de) * | 2013-08-08 | 2015-02-12 | Tridonic Gmbh & Co Kg | Vorrichtung und Verfahren zur indirekten Bestimmung einer elektrischen Versorgung |
| DE102017220582A1 (de) * | 2017-11-17 | 2019-05-23 | Tridonic Gmbh & Co Kg | Betriebsschaltung für ein LED-Leuchtmittel |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0338109B1 (de) * | 1988-04-20 | 1994-03-23 | Zumtobel Aktiengesellschaft | Vorschaltgerät für eine Entladungslampe |
| EP0677982B1 (de) * | 1994-04-15 | 2000-02-09 | Knobel Ag Lichttechnische Komponenten | Verfahren zum Betrieb eines Vorschaltgeräts für Entladungslampen |
| FI101186B1 (fi) * | 1996-12-16 | 1998-04-30 | Helvar Oy | Lämpösuojapiirillä varustettu elektroninen liitäntälaite |
| JP3942387B2 (ja) * | 2001-02-13 | 2007-07-11 | 株式会社小糸製作所 | 放電灯点灯回路 |
| DE10164242B4 (de) * | 2001-12-27 | 2014-07-03 | Tridonic Gmbh & Co Kg | Elektronisches Vorschaltgerät mit Strombegrenzung bei Leistungsreglung |
| US6982528B2 (en) * | 2003-11-12 | 2006-01-03 | Lutron Electronics Co., Inc. | Thermal protection for lamp ballasts |
| DE102004007006A1 (de) * | 2004-02-12 | 2005-08-25 | Lamptronic International Gmbh & Co.Kg | Temperaturgesteuertes, elektronisches Vorschaltgerät für Gasentladungslampen |
| DE102004009583A1 (de) * | 2004-02-25 | 2005-09-29 | Vossloh-Schwabe Elektronik Gmbh | Vorschaltgerät mit verbesserter Notstrombetriebsumschaltung |
| US7606679B1 (en) * | 2006-09-25 | 2009-10-20 | Semiconductor Components Industries, L.L.C. | Diagnostic and maintenance systems and methods for LED power management integrated circuits |
| WO2008155714A1 (en) * | 2007-06-20 | 2008-12-24 | Koninklijke Philips Electronics N.V. | Lamp driver, lighting system and method |
| US7696698B2 (en) * | 2007-12-31 | 2010-04-13 | Lumination Llc | LEDs tricolor power signal |
| US8183797B2 (en) * | 2009-09-18 | 2012-05-22 | Boca Flasher, Inc | 90-260Vac dimmable MR16 LED lamp |
-
2011
- 2011-06-08 DE DE102011103638A patent/DE102011103638A1/de not_active Withdrawn
-
2012
- 2012-06-06 WO PCT/AT2012/000156 patent/WO2012167292A1/de not_active Ceased
- 2012-06-06 EP EP12735185.6A patent/EP2719259B1/de active Active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2012167292A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2012167292A1 (de) | 2012-12-13 |
| EP2719259B1 (de) | 2019-10-30 |
| DE102011103638A1 (de) | 2012-12-13 |
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