EP2119324A1 - Method for determining a crest factor of a lamp current of an electric lamp - Google Patents
Method for determining a crest factor of a lamp current of an electric lampInfo
- Publication number
- EP2119324A1 EP2119324A1 EP07703787A EP07703787A EP2119324A1 EP 2119324 A1 EP2119324 A1 EP 2119324A1 EP 07703787 A EP07703787 A EP 07703787A EP 07703787 A EP07703787 A EP 07703787A EP 2119324 A1 EP2119324 A1 EP 2119324A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- crest factor
- lamp
- variable
- operating variable
- value
- 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.)
- Withdrawn
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
- H05B41/2858—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the lamp against abnormal 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
- H05B41/36—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
- H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
Definitions
- the invention relates to a method for determining a crest factor of a lamp current of an electric lamp, in which at least one operating parameter of the lamp is ⁇ represents is.
- an oscillation can typically develop in the lower area of the dimming area, in particular in the lower third of the dimming area, which results from the interplay of the lamp characteristic curve, resonant circuit and regulation.
- This area also referred to as the "frequency inversion” area, is particularly noticeable during a start-up phase of amalgam lamps, and under extreme ambient temperatures, such a "frequency inversion” area is also observed with mercury lamps.
- This oscillation causes a strong modulation of the lamp current with frequencies of 30 Hz to 10 kHz and is usually not recognizable as optical instability. However, the high crest factor of the lamp current caused thereby can have severe damage to the electric lamp and a life-shortening effect.
- this range of the crest factor is attempted by suitably selecting the resonant circuit and regulation to keep small.
- the damaging effect of the high crest factor is reduced by increased lamp filament heating.
- either the range of the permissible ambient temperature for dimming operation is restricted or the permissible dimming range is reduced at extreme ambient temperatures.
- the full dimming function is released only after a predetermined period of time after switching on, in order thereby to bridge the ramp-up phase.
- the present invention has for its object to be able to perform a Crest regimenbetician little effort and easy.
- a crest factor of a lamp current of an electric lamp is determined and possibly changed.
- At least one operating variable of the electric lamp is set or regulated.
- a setpoint is specified and the crest factor of the operating variable is determined.
- the setpoint value is used as the mean value for this determination of the crest factor of the operating variable and, depending on the crest factor of the operating variable, the crest factor of the lamp current correlated with this crest factor of the operating variable is determined.
- a predetermined setpoint is explicitly for the crest factor determination used, wherein provide this desired value the mean value or the effective value in behaves ⁇ nis peak to rms value of the crest factor represents ⁇ . It is therefore no longer required and is not deduce to-gCode controller variables in a complex andscienceansocili ⁇ ger way but it can be accessed directly on the controller variables.
- the regulation of the operating variable, insbeson ⁇ particular a controlled variable is preferably carried out by a standardized digital loop control settings. Compared to analog embodiments can thus be accessed directly and explicitly to the controller variables and an explicit and direct Bestim ⁇ tion the crest factor based on these data can then be explicitly known.
- the operating variable is a controlled variable of the Lam ⁇ pe, which is controlled by a control unit for the lamp ⁇ di rectly and thus directly set. It is so ⁇ diagnosed with a crest factor of the controlled variable and from ⁇ dependence from that of the Correlated with this crest factor of the lamp current is then determined.
- the operating variable is a correlated with the controlled variable auxiliary variable, which is set by the control unit indirectly via the setting of the controlled variable.
- An auxiliary variable is so-characterized by the fact that it is not adjusted directly and immediately by the Rege ⁇ averaging unit, but also the auxiliary variable can be changed due to the adjustment of the control variable.
- the crest factor of the lamp current is changed by changing the crest factor of the operating quantity.
- the crest factor of the operating variable is preferably changed as a function of a comparison with at least one reference crest factor of the operating variable.
- At least one comparison is made gleichsschwellwert depending on the target value with which the actual value is vergli ⁇ Chen and when it exceeds the threshold value comparison ⁇ by the actual value of the crest factor of the operating variable is changed.
- a crest factor excess is thus detected from a nominal-actual comparison of the existing control variables or the existing auxiliary quantities.
- a maximum and a minimum comparison threshold value are preferably formed and compared with the actual value. Exceeding these comparison thresholds or limits then corresponds to exceeding the maximum permissible crest factor. In a particularly cost-poor way, as are ⁇ obtained by the crest factor of the company size and are therefore very easy to determine the crest factor of the lamp current.
- the comparison threshold is preferably correlated with a ticket ⁇ mean value of the crest factor.
- the comparison ⁇ threshold value can be formed with a multiplier and an offset.
- the crest factor is changed by a change in the desired value of the operating variable.
- a change in the desired value of the operating variable Through this pre ⁇ hens as can explicitly a setpoint value changed ⁇ changed and re-defined. Depending on this newly set setpoint, the further control of the electric lamp then takes place.
- the change in the crest factor is effected by a change in the control variable which can be controlled explicitly by the control unit, in particular by the change in the regulator properties of the controller of the control unit. A change of the desired value of said variable ⁇ or in particular, the controlled variable is not performed here.
- the change in the target ⁇ value of said variable and at the same time the change is performed egg ner regulating property of a controller of the control unit when the maximum crest factor.
- the former can be done on the one hand, for example, by changing the dimming position and the second by adapting the controller parameter or the controller parameters.
- Reglerparamter or regulators property such as the strengthening of a re ⁇ geldifferenz can be called between a target and an actual value of a comparator.
- the operation amount is preferably carried Lampenbrenn- the voltage, the discharge current, the lamp power, the lamp resistance or the phase angle, which is different from the reactive part active component, CHARACTERI ⁇ Siert. These explicit quantities allow a new way of detecting the lamp current crest factor from already existing control variables or auxiliary quantities.
- FIG. 2 shows a flow chart for determining a crest factor of a lamp current of an electric lamp.
- Fig. 1 is a schematic representation of a scarf ⁇ tion arrangement is shown, which is designed for operating an electric lamp 2, which is designed as a fluorescent lamp.
- a lamp circuit 1 of a ballast is shown, which is electrically connected to the lamp 2.
- the lamp circuit 1 has a half-bridge inverter 11, which is electrically connected to an output with an inductor 12.
- the inductor 12 is further electrically connected to a first lamp filament 21 of the lamp 2.
- the inductance 12 has an electrical connection to a capacitor, which in the exemplary embodiment is designed as a starting capacitor 13a.
- the ignition capacitor 13a can also be designed as an element of a voltage divider circuit for lamp voltage measurement, which can also be realized as a resistor divider circuit.
- the lamp circuit 1 comprises a subcircuit 14a, which is designed to detect a lamp power of the lamp 2.
- the subcircuit 14a is connected to the half-bridge inverter 11 for this purpose.
- the subcircuit 14a is connected to a digital control unit 15.
- a further capacitor which is in the exemplary embodiment being formed as a half-bridge capacitor 13b ⁇ , connected to a second lamp filament 22nd
- the sub-circuits 14b, 14c and 14d indicated in more detail by the following ⁇ are not, or not necessarily intermittent, so that 13b has an electrical connection to Massepo ⁇ potential in this first-mentioned embodiment of the half-bridge capacitor.
- the digital formed in the embodiment Rege ⁇ averaging unit 15 is further provided with the Halbschenwech- selrichter 11 are electrically connected.
- the circuit arrangement shown in Fig. 1 is designed to determine and limit a crest factor of a lamp current.
- control unit 15 is designed for the explicit and immediate regulation of at least one controlled variable and, moreover, for the crest factor evaluation.
- the lamp burning voltage characterizing signal is transmitted gene. With the subcircuit 14b thus a lamp-burning voltage detection is possible.
- the third subcircuit 14c is provided which is connected to the half-bridge capacitor 13b on the one hand and the control unit 15 on the other hand.
- the third subcircuit 14c is designed for phase angle detection or lamp current detection.
- the fourth subcircuit 14d is provided, which is connected to the second lamp filament 22 and the control unit 15.
- the fourth sub-circuit 14d is designed to detect the lamp resistance.
- a lamp circuit 1 is formed with only one of the four sub-circuits 14a to 14d.
- the sub-circuit 14a to 14d provided in the lamp scarf ⁇ device 1, whose controlled parameter detected directly as the control variable by the control unit 15 who can ⁇ .
- the partial circuits 14a to 14d may be formed as Messwerterfas ⁇ ser, which is designed for detecting an analog quantity and to digital conversion of this size.
- the digital signal is then transmitted to the integrated crizungsein ⁇ 15th Likewise, however, it can also be provided that the digital conversion of the analogically detected variable is carried out only in the control unit 15.
- the sub-circuits 14a to 14d depending ⁇ can be realized as a microprocessor, or comprise a microprocessor.
- one of the sub-circuits 14a to 14d and the control unit 15 are implemented in a microprocessor or having a microprocessor. The determination and adjustment of the crest factor of a lamp current can then be completely digital depending on the configuration.
- Fig. 2 is a schematic flow diagram of a Sig ⁇ nalhnes when performing a crest factor determination and crest factor limiting a lamp current is shown.
- a target value of a driving Be ⁇ size is predetermined.
- this may be the Lam ⁇ pen juice when the sub-circuit 14a is provided in the embodiment of FIG. 1.
- the desired value of the controlled variable directly controllable by the control unit 15 is determined therefrom on the basis of the predetermined components of the lighting system.
- This target value which is value of the controlled variable in the embodiment of SOIL
- the control unit 15 be ⁇ known and is stored in this and dependent on the setpoint ⁇ sem the electric power is regulated according to the step S2.
- the output of the integrated crizungsein ⁇ 15 is applied to the circuit part I and controlled the lamp power accordingly.
- the control unit 15 comprises a comparator 16 which the target value and the actual value of the controlled variable ver ⁇ like and the control difference of a unit portion 15b, egg ⁇ linear regulator, the control unit 15 transmits.
- the controller and the sub-unit 15b is configured with its own controller sheep ⁇ th eg. For amplifying the difference regulator.
- this actual value is transmitted to the crest factor evaluation of the controlled variable, in the exemplary embodiment of the lamp power, to a subunit 15a of the control unit 15.
- the setpoint value is also transmitted to this subunit 15a, and the crest factor of the controlled variable is determined by using the setpoint value as mean value in this determination of the crest factor of the controlled variable.
- ⁇ comparison threshold values are formed dependent on the desired value. In the exemplary embodiment, a maximum and a minimum comparison threshold are formed. A comparison threshold is correlated with a crest factor of the crest factor.
- the actual value is compared with theticiansschwell notes and depending on exceeding thewheresschwelleptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptepteptept
- the control unit 15 for the direct control of the parameter of the lamp output is formed. If only the subcircuit 14b is provided in the circuit arrangement according to FIG. 1, then only the lamp burning voltage can be detected by it. However, this represents a parameter which can not be regulated directly by the control unit 15. Nevertheless, this lamp operating voltage can also here according to a step S6 then be used as an auxiliary variable handlingge ⁇ Given that a crest factor of the lamp voltage is determined.
- the crest factor of the lamp current which is correlated with this crest factor of the lamp power voltage, can be determined and, if appropriate, according to the method described above. go, when exceeding a change in the crest factor be brought about to the effect that according to the step S4, the predetermined setpoint is changed or preferably in addition a controller property of the subunit 15b according to step S5 is changed.
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2007/050242 WO2008083855A1 (en) | 2007-01-11 | 2007-01-11 | Method for determining a crest factor of a lamp current of an electric lamp |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2119324A1 true EP2119324A1 (en) | 2009-11-18 |
Family
ID=38461137
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07703787A Withdrawn EP2119324A1 (en) | 2007-01-11 | 2007-01-11 | Method for determining a crest factor of a lamp current of an electric lamp |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2119324A1 (en) |
WO (1) | WO2008083855A1 (en) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5363020A (en) | 1993-02-05 | 1994-11-08 | Systems And Service International, Inc. | Electronic power controller |
WO2000040058A1 (en) * | 1998-12-29 | 2000-07-06 | Koninklijke Philips Electronics N.V. | Dimmable electronic ballast with single stage feedback inverter |
TW507473B (en) * | 2000-08-28 | 2002-10-21 | Koninkl Philips Electronics Nv | Circuit device |
US6891339B2 (en) * | 2002-09-19 | 2005-05-10 | International Rectifier Corporation | Adaptive CFL control circuit |
DE102005027012A1 (en) | 2005-06-10 | 2006-12-14 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Circuit arrangement and method for detecting a crest factor of a lamp current or a lamp burning voltage of an electric lamp |
-
2007
- 2007-01-11 WO PCT/EP2007/050242 patent/WO2008083855A1/en active Application Filing
- 2007-01-11 EP EP07703787A patent/EP2119324A1/en not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO2008083855A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2008083855A1 (en) | 2008-07-17 |
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Legal Events
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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17P | Request for examination filed |
Effective date: 20090514 |
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Effective date: 20091123 |
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DAX | Request for extension of the european patent (deleted) | ||
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: OSRAM AG |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: OSRAM GMBH |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: OSRAM GMBH |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20160802 |