EP2236013A2 - Circuit arrangement and method for regulating the current through at least one discharge lamp - Google Patents
Circuit arrangement and method for regulating the current through at least one discharge lampInfo
- Publication number
- EP2236013A2 EP2236013A2 EP08708148A EP08708148A EP2236013A2 EP 2236013 A2 EP2236013 A2 EP 2236013A2 EP 08708148 A EP08708148 A EP 08708148A EP 08708148 A EP08708148 A EP 08708148A EP 2236013 A2 EP2236013 A2 EP 2236013A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- input
- microprocessor
- circuit arrangement
- vcc
- gnd
- 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- Withdrawn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
- H05B41/36—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 present invention relates to a Wegungsanord ⁇ tion for controlling the current through at least one discharge lamp with a control loop, a set value ⁇ input for supplying a setpoint, an actual value input for supplying an actual value and an output for providing a signal that is connected to the stream is correlated with the at least one discharge lamp, comprising, wherein the actual value with the value of the current through the Ent ⁇ discharge lamp correlated, and a set value ⁇ device which is adapted to provide the setpoint to the Re ⁇ gel Vietnamese.
- a ⁇ Ver drive for controlling the current through at least one unloading discharge lamp by means of such a circuit arrangement.
- the present invention relates to the problem that a lamp current flows on its way through an electronic ballast, cable and the lamp itself by a vibrating system with parasitic components of inductive, capacitive and / or resistive nature.
- a lamp current flows on its way through an electronic ballast, cable and the lamp itself by a vibrating system with parasitic components of inductive, capacitive and / or resistive nature.
- the specification of a reference value is usually carried out by a DAC (digital-analog converter), by an RC element or by an R2R network.
- a DAC is expensive, on the other hand its maximum operating frequency represents the maximum frequency of change of the nominal value.
- different setpoint values can be generated by varying the duty cycle of a ansteu ⁇ ernden PWM signal. In this case, an RC element has a time constant ⁇ .
- the present invention is therefore based on the object as quickly and accurately control the lamp current despite parasitic and limiting influences.
- high rates of change of the setpoint should be achievable with the smallest possible ripples.
- the present invention is based on the finding that the above object can be achieved when dynamic as- change the time constant of the control loop being ⁇ made possible. So a slower time constant of the control loop rea ⁇ larra can be for slow changes in the set ⁇ value, whereas the fast changes Setpoint, a fast time constant of the control loop can be initiated.
- the setpoint input device further comprises a microprocessor having at least one input, wherein the microprocessor is adapted to at least to couple an input having a potential of egg ⁇ ner group of at least two different Potenti ⁇ alen and a Bescharisvoriques with at least an input, which is coupled to the at least one input of the microprocessor, and at least one output, which is coupled to at least one point of the control ⁇ circle.
- ripples can be reliably minimized during slower rates of change of the setpoint value, while rapid change rates of the setpoint value can nevertheless be made.
- the inventive measure the Lam ⁇ penstrom can be controlled very precisely. This results in Gi ⁇ onsanassembleen different advantages: Firstly, can thereby the light output closely kontrollie ⁇ ren This is by projection method with digital light modulation, such as DLP, required to erzie ⁇ len most accurate adjustment of image colors.. Secondly, this measure makes it possible to optimize the lamp current to the requirements of the lamp; For example, the timing pulse and commutation tion affects the tip growth on the lamp electrodes and hence the light output of the projection system. Third, switching overshoots can be avoided, thereby reducing ballast acoustic noise. Wei ⁇ terhin can thereby inductances in the electronic Ballast be further controlled without the risk of these going into saturation.
- the lamp current can be optimized to the requirements of the electronic ballast; For example, artificially ver ⁇ slowed switching edges can be generated by the inventive measure. Thereby, the noise components of the electronic ballast, capacitors and inductors in particular by Kon ⁇ reduced.
- the at least one point of the control loop to which the output of the Bescharisvortechnische is coupled the actual value input, the setpoint input and / or the output of the control loop. Accordingly, there are different ways ⁇ Liche ready to be attacked where Scheme- in the loop to change the time constant. Depending on the application, one or the other variant may be preferred.
- the group of potentials of the micro ⁇ processor comprises at least two of the following potentials: Ground, analog value, high impedance, tristate, with pullup resistor, without pullup resistor, with pulldown resistor, without pulldown resistor, open (floating) and supply voltage.
- the microprocessor is designed to periodically switch the at least one input back and forth with a predefinable duty cycle between two potentials, in particular ground and supply voltage.
- control circuit preferably has a time constant of the control, wherein the wiring device comprises at least one component for influencing this time constant.
- the snubber device preferably comprises at least one ohmic resistor and / or at least one capacitor.
- the Bescensvorraum comprises at least two components which are coupled on one side to a respective one point, in particular the same point, the control ⁇ circuit and on the other hand each having an input, into the special ⁇ different inputs of the microprocessor.
- the effect of respec ⁇ gen component can be switched on or off separately or varied in strength.
- the wiring device has at least a first and a second input and the microprocessor at least a first and a second input, wherein the first input of the Bescensvor- direction with the first input of the microprocessor and the second input of the snubber device is coupled to the second input of the microprocessor, wherein the first and the second input of the microprocessor are coupled to the same potential or with different potentials.
- the microprocessor has an interface in order to couple the at least one input with a predeterminable potential from the group of at least two different potentials.
- the processing Sollwertvorgabevorrich- comprises a drive apparatus, wherein the control device is preferably controlled via the interface by the micropro cessor ⁇ .
- the control device is preferably controlled via the interface by the micropro cessor ⁇ .
- This opens up the possibility of providing a DA converter in the drive device, which is then coupled to the at least one point of the control loop. This can be done at the coupling point for generating the desired value, a superposition of the device supplied via the Beschal ⁇ device and the signal supplied by the DA converter. This results in even more ways to change the setpoint as desired.
- FIG. 1 shows a schematic representation of an embodiment of a circuit arrangement according to the invention.
- This provides at its output a lamp current I L to a discharge lamp La ready. It comprises a Re ⁇ gel Vietnamese 10, the reference variable of a setpoint value U So ii and the feedback signal representing an actual value Ui st, wherein from these values the control difference .DELTA.U is formed by subtraction.
- the control difference .DELTA.U is supplied to a load circuit 12 of the circuit arrangement, whereby the output current of the control circuit 10, the lamp current I L he ⁇ gives.
- the actual value Ui st is generated from the lamp current I L a measuring member 14, such as a shunt resistor, which is attached ⁇ arranged at a suitable point in the load circuit.
- the circuit arrangement of FIG. 1 further comprises a drive device 16 which provides at its output a first portion of the reference variable U So ii at a coupling-in point EP and preferably comprises a DA converter for this purpose.
- a second part of the reference variable U So ii is from a also provided with the coupling point EP coupled device 18 having a plurality of inputs El to E4, which are coupled to respective inputs E5 to E8 of a microprocessor 20.
- the microprocessor 20 is designed to couple each of its inputs E5 to E8 with one of the potentials VCC, Open, Analog, GND, as shown by way of example for its input E6.
- the coupling may also be such that the microprocessor periodically toggles between two or more potentials, thereby virtually applying a PWM signal to the crosstalk device 18. Due to the duty cycle and the frequency of the PWM signal provided to the control loop target value is ⁇ Usoii ⁇ particular its time constant determined.
- the wiring device 18 comprises an ohmic resistor Rl, which is coupled between the input El of the wiring device 18 and the coupling point EP in the control ⁇ circle 10. It further comprises a rule ⁇ ohm resistor R2 is coupled between the input E2 and the coupling-in point EP. Furthermore, a first capacitor Cl is provided, which is coupled between the input E3 and the coupling point EP, and a con ⁇ capacitor C2, which is coupled between the input E4 and the coupling point EP.
- the microprocessor 20 further comprises an interface 22, via which it controls the DA converter of the drive device 16.
- a change in the capacitance acting on the injection point EP is preferably made for a permanent change of the time constant.
- the ohmic resistance effective at the injection point EP is preferably changed. If, for example, the input E5 is switched to VCC, then the level at the injection point EP can be increased rapidly. If the input is connected to ground GND E5, so characterized, the level can be quickly ernied ⁇ rigt at the coupling of the regulator.
- the coupling point may alternatively or additionally be the actual value input and / or the output of the control loop 10.
- further potentials can be present instead of the illustrated in the microprocessor 20 potentials example ⁇ to high impedance, tri, with pull-up resistor, without pull-up resistor, with pull-down resistor without PuIl- down resistor.
- the drive device 16 is eliminated. Then, at the coupling point EP, only a component provided by the microprocessor 20 via the wiring device 18 is provided as the setpoint U So ii at the coupling point EP.
- timing of the setpoint in Mik ⁇ roreaor can be stored or 20 but is not shown via an interface to be supplied from outside the micropro cessor ⁇ 20th
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
- Electronic Switches (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2008/050809 WO2009092447A2 (en) | 2008-01-24 | 2008-01-24 | Circuit arrangement and method for regulating the current through at least one discharge lamp |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2236013A2 true EP2236013A2 (en) | 2010-10-06 |
Family
ID=40901471
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08708148A Withdrawn EP2236013A2 (en) | 2008-01-24 | 2008-01-24 | Circuit arrangement and method for regulating the current through at least one discharge lamp |
Country Status (5)
Country | Link |
---|---|
US (1) | US8207681B2 (en) |
EP (1) | EP2236013A2 (en) |
CN (1) | CN101926231B (en) |
TW (1) | TW200942080A (en) |
WO (1) | WO2009092447A2 (en) |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19546588A1 (en) | 1995-12-13 | 1997-06-19 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Method and circuit arrangement for operating a discharge lamp |
US7352139B2 (en) * | 2004-02-11 | 2008-04-01 | International Rectifier Corporation | Multiple lamp ballast control circuit |
CN101053285A (en) * | 2004-10-29 | 2007-10-10 | 皇家飞利浦电子股份有限公司 | Robust driver for high intensity discharge lamp |
US7414372B2 (en) * | 2005-10-24 | 2008-08-19 | International Rectifier Corporation | Dimming ballast control circuit |
CN200941703Y (en) * | 2005-12-29 | 2007-08-29 | 飞利浦(中国)投资有限公司 | Pulse generator for electronic ballast |
DE102006014062B4 (en) | 2006-03-27 | 2018-05-17 | Tridonic Gmbh & Co Kg | Operating device for bulbs |
WO2008037290A1 (en) * | 2006-09-25 | 2008-04-03 | Osram Gesellschaft mit beschränkter Haftung | Circuit arrangement and method for starting a discharge lamp |
US8067902B2 (en) * | 2008-09-05 | 2011-11-29 | Lutron Electronics Co., Inc. | Electronic ballast having a symmetric topology |
-
2008
- 2008-01-24 EP EP08708148A patent/EP2236013A2/en not_active Withdrawn
- 2008-01-24 CN CN200880125706.3A patent/CN101926231B/en not_active Expired - Fee Related
- 2008-01-24 US US12/864,245 patent/US8207681B2/en not_active Expired - Fee Related
- 2008-01-24 WO PCT/EP2008/050809 patent/WO2009092447A2/en active Application Filing
-
2009
- 2009-01-19 TW TW098101858A patent/TW200942080A/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO2009092447A2 * |
Also Published As
Publication number | Publication date |
---|---|
US20100295467A1 (en) | 2010-11-25 |
CN101926231B (en) | 2013-08-21 |
CN101926231A (en) | 2010-12-22 |
TW200942080A (en) | 2009-10-01 |
WO2009092447A2 (en) | 2009-07-30 |
WO2009092447A3 (en) | 2010-04-22 |
US8207681B2 (en) | 2012-06-26 |
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Legal Events
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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) |
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18D | Application deemed to be withdrawn |
Effective date: 20150801 |