EP2656697A2 - Chauffage de filament régulé pour lampes à décharge - Google Patents

Chauffage de filament régulé pour lampes à décharge

Info

Publication number
EP2656697A2
EP2656697A2 EP11815746.0A EP11815746A EP2656697A2 EP 2656697 A2 EP2656697 A2 EP 2656697A2 EP 11815746 A EP11815746 A EP 11815746A EP 2656697 A2 EP2656697 A2 EP 2656697A2
Authority
EP
European Patent Office
Prior art keywords
gas discharge
voltage
circuit
heating
discharge lamp
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Withdrawn
Application number
EP11815746.0A
Other languages
German (de)
English (en)
Inventor
Dietmar Klien
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tridonic GmbH and Co KG
Original Assignee
Tridonic GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tridonic GmbH and Co KG filed Critical Tridonic GmbH and Co KG
Publication of EP2656697A2 publication Critical patent/EP2656697A2/fr
Withdrawn legal-status Critical Current

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
    • H05B41/3925—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by frequency variation
    • 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
    • H05B41/16—Circuit arrangements in which the lamp is fed by DC or by low-frequency AC, e.g. by 50 cycles/sec AC, or with network frequencies
    • H05B41/20—Circuit arrangements in which the lamp is fed by DC or by low-frequency AC, e.g. by 50 cycles/sec AC, or with network frequencies having no starting switch
    • H05B41/23—Circuit arrangements in which the lamp is fed by DC or by low-frequency AC, e.g. by 50 cycles/sec AC, or with network frequencies having no starting switch for lamps not having an auxiliary starting electrode
    • H05B41/232—Circuit arrangements in which the lamp is fed by DC or by low-frequency AC, e.g. by 50 cycles/sec AC, or with network frequencies having no starting switch for lamps not having an auxiliary starting electrode for low-pressure lamps
    • H05B41/2325—Circuit arrangements in which the lamp is fed by DC or by low-frequency AC, e.g. by 50 cycles/sec AC, or with network frequencies having no starting switch for lamps not having an auxiliary starting electrode for low-pressure lamps provided with pre-heating electrodes
    • 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
    • H05B41/295—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 and specially adapted for lamps with preheating electrodes, e.g. for fluorescent lamps

Definitions

  • the invention relates to a ballast and a method which allows to determine the temperature of a heating coil of a gas discharge lamp and to control a heating power of the heating coil in dependence on the determined temperature.
  • the invention further relates to a circuit for carrying out the method.
  • a parameter influencing the heating power for example the T 0n time of a converter
  • the control circuit thus receives the dimming value and then sets the heating circuit.
  • Figs. 1 and 2 show schematically a ballast according to the prior art, to which a lamp is connected. Its operation is illustrated in FIG.
  • the heating circuit is controlled in direct relation to the setpoint.
  • the filaments of a gas discharge lamp are heated on the one hand by a discharge flow from a load circuit and by a heating current from a heating circuit.
  • the discharge current is greatly reduced, so that the heating current must be increased in order to keep the temperature of the respective coil at a desired value, the emission temperature.
  • the reduction of the discharge current must therefore be compensated for at least one coil by increasing the heating current.
  • Inverter frequency must not be constant, since another, the frequency and thus the required heat output influencing parameter, the temperature (on) the lamp is. Thus, it can lead to a variation of the half-bridge frequency and thus the heating power at a constant dimming value. This variation is not considered in the prior art.
  • the invention therefore proposes to detect a coil temperature directly or indirectly and to regulate the coil temperature in a closed-loop, that is to say a closed-loop feedback loop,
  • the present invention merely relates to a determination of a coil parameter and preferably to a determination of helical tension.
  • the present invention achieves the above object by providing a ballast, a method of controlling a helix voltage, and a circuit for performing this method as claimed in the independent claims. Further developments of the invention are the subject of the dependent claims.
  • the invention provides a ballast for at least one gas discharge lamp having a load circuit to which the gas discharge lamp is to be connected, a switch circuit controlled by a preferably cycled heating circuit for at least one filament of the gas discharge lamp, and a control circuit, the control circuit directly or indirectly detects a temperature of at least one coil based on a preferably electrical temperature parameter such as. A voltage and / or current at the at least one coil, and the control circuit uses the determined temperature parameter as an actual value for a control of a heating power to depending on the temperature parameter to control the helix supplied electric heating power by driving, preferably clocking the switch of the heating circuit.
  • the ballast may include an inverter and the heating circuit may be based on a DC power supply of the inverter or a voltage derived from the output of the inverter, preferably the AC center point voltage of the inverter
  • the heating circuit has a transformer which is clocked on the primary side by the switch PWM and the control variable of the heating circuit is preferably the on- time of the switch.
  • control circuit voltages and / or currents can be determined on coils of several gas discharge lamps, each one of which the temperature of the respective coil determined parameters and the respective heating circuits are set accordingly.
  • Each gas discharge lamp can be preset at least one setpoint.
  • the setpoint may be dependent on a dimming level / levels, a type of lamp detected via the coils, or constant and / or dependent on one specified by the manufacturer of the gas discharge lamp
  • Emission parameters e.g. an emission temperature.
  • the control can also be done in the field of preheating the coils.
  • a maximum value for the filament voltage can be predetermined, which must not be exceeded in the preheating phase, for example to avoid transverse discharges above the filament.
  • the desired value (s) may be provided in the form of at least one look-up table and / or be programmable, wherein programming is preferably performed by a software update and / or an absolute value / absolute value and / or a dependency of the reference value is changed.
  • the invention provides a method of controlling a helical voltage of a gas discharge lamp, comprising the steps of: directly or indirectly detecting a temperature of at least one Spiral of the gas discharge lamp on the basis of a preferably electrical temperature parameter such as a voltage and / or current at the at least one coil by a control circuit, using the determined temperature parameter as the actual value for controlling a heating power, rules of the helix supplied electric heating power by a control dependent on the temperature parameter control by the control circuit (SS), preferably by clocking a switch of a controlled, preferably cycled heating circuit for the filament (Wl, W2) of the gas discharge lamp.
  • a preferably electrical temperature parameter such as a voltage and / or current at the at least one coil
  • the heating circuit can be based on a DC voltage supply of an inverter or a voltage derived from the output of the inverter, preferably the AC center point voltage of the
  • Inverter to be supplied.
  • the invention provides a circuit, in particular C or ASIC, adapted for performing a method as described above.
  • Fig. 1 shows schematically a Vorschaltgerat
  • FIG. 2 shows schematically a control of the heating power according to the prior art.
  • Fig. 3 shows schematically an inventive
  • Fig. 4 shows an example of a
  • Fig. 5 shows in a diagram a
  • FIG. 3 shows a ballast V which is used to operate a gas discharge lamp L with heating coils W1, W2.
  • a mains voltage To generate an operating voltage for the gas discharge lamp L is rectified by a rectifier, a mains voltage and smoothed in a smoothing circuit.
  • the smoothing circuit may also include an active or passive power factor correction circuit.
  • Inverter generates an AC voltage that is fed to a resonant circuit.
  • the voltage is supplied to the gas discharge lamp L as the operating voltage.
  • At least one filament of the gas discharge lamp is heated (also in the firing mode).
  • the heating is regulated, ie with a measured feedback variable as the actual value for the control.
  • the invention makes the ohmic properties of a Helix a gas discharge lamp L by the helix is considered as an ohmic resistance.
  • a temperature of the coil of reproducing parameters can be obtained by determining a current and / or a voltage at the coil. This parameter can then be compared with a desired value and, depending on this comparison, a control variable of a heating circuit for the filament (for example a T 0n time of a (flyback) converter) can be set.
  • a control variable of a heating circuit for the filament for example a T 0n time of a (flyback) converter
  • a helical current and / or a helix tension at / via the helix is determined. So these are examples of the measurement of a parameter representing the coil temperature.
  • the determined values are fed to a control circuit SS (eg ASIC, microcontroller) as a parameter representing the temperature at the helix.
  • the control circuit SS compares this parameter with a setpoint, which is stored, for example, in a memory and, for example, can be predetermined by the lamp manufacturer. Based on this comparison, the control circuit SS controls the heating circuit according to a control variable, which results from the comparison of the determined parameter corresponding to the actual value, and the desired value. Accordingly, the output heating power changes and the coil is heated accordingly.
  • the control of the heating circuit and the heating power thus takes place on the concrete temperature of the coil.
  • the heating circuit can thus be independent of a midpoint voltage of the inverter and, z. B., be operated directly by a DC link voltage (bus voltage).
  • the supply voltage for the heating circuit can be the inverter supplied, substantially constant, DC link voltage.
  • the invention can be applied in principle to other heating topologies, in particular to those in which the voltage supply of the heating circuit starting (downstream) takes place to the inverter.
  • the control circuit SS can clock a primary-side switch of a transformer, preferably a flyback converter.
  • the control variable determined by the control circuit SS is then a T 0n time of this switch.
  • the principle of the flyback converter is that a lot of energy is stored in the magnetic field of a magnetically coupled coil with the switch element closed (1st phase, "charging”, conducting phase) and then on the consumer side When the switch element is opened, this cycle is controlled and traversed at a switching frequency so that, for example, a quasi-continuous flow of energy from the generator side to the load side occurs.
  • a current flows through a primary-side coil, which is caused by the input voltage UE.
  • the secondary-side coil is de-energized.
  • a magnetic tension builds up in the air gap.
  • the output voltage is held by a capacitor.
  • the blocking phase begins.
  • the current through the primary-side coil abruptly 'falls by opening the switch element to zero.
  • the current through the secondary-side coil increases and charges the capacitor to an output voltage. This current decreases linearly and finally becomes zero in a latching mode when all the energy has flown out of the secondary coil, ie the coil is "discharged.”
  • the switch closes again, the conduction phase begins again, and the cycle begins again.
  • the actual energy transport to the secondary side takes place during the blocking phase.
  • FIG. 4 an embodiment of a circuit according to the invention is shown.
  • This shows a heating circuit topology in which the supply of the heating circuit is carried out starting from a tap between the center and the lamp.
  • the heating circuit but also for example via a Coupling to the smoothed bus voltage Vbus be supplied.
  • the setpoint value (Vnom) can also be determined as a function of a level DL (dimming value).
  • frequency information f-inform
  • an emission temperature predetermined by a manufacturer of the gas discharge lamp L can be maintained at the monitored coil.
  • the control circuit SS may be a step-up / step-down converter.
  • one of the following controllers can be used for the control circuit SS: proportional controller (P controller), proportional-integral controller (PI controller), proportional-integral-derivative controller (PID controller), proportional differential Controller (PD controller).
  • P controller proportional controller
  • PI controller proportional-integral controller
  • PID controller proportional-integral-derivative controller
  • PD controller proportional differential Controller
  • a logic for a step-up / step-down converter can be realized, for example, as follows: an average value vfil_avg over a number of measurements (eg several samples) is determined by a comparison with the setpoint value, eg the nominal filament voltage Vnom, respectively .
  • vfil_nom of the dimming value calculated setpoint, to decide whether the T on - ince / the switching frequency of the primary-side switch element of the flyback converter to be changed. This is the case if the value vfil_nom differs from the vfil_avg. If both values are equal, the on- time / the switching frequency for the primary-side switch element remains unchanged. If the setpoint value for the determined dimming value parameter is dependent, the setpoint value preferably decreases towards higher dimming values. This is shown in FIG.
  • the reason for this decrease is that at higher dimming values and thus a higher discharge current, localized heating of the filament (hot spot) occurs.
  • This local heating is not completely reflected in the filament voltage, and thus in the parameter determined (if this is the filament voltage), because the rest of the filament is not heated up accordingly.
  • the heating current can therefore be reduced in the range of higher dimming values. It is also provided, for example, in the preheating a maximum value for z. B. specify the helical tension, which must not be exceeded in the preheating.
  • the filament voltage is limited to avoid, for example, a transverse discharge over the heating coil.
  • the control circuit SS connected to the bus voltage Vbus determines the start of a preheat phase for the gas discharge lamp L.
  • the heating power or the filament current can be kept constant during the preheating phase in general.
  • the setpoint for the filament voltage (in general: the setpoint for the filament temperature Parameter) is preferably dependent on the current operating phase known to the controller, that is preferably different for the operating states "preheat", “stable operation", "burning immediately after ignition", etc.
  • the setpoint can also be dependent on one, for example via the helix be recognized lamp type.
  • the setpoint can be configured programmable even with installed systems and preferably be changed by a software update. It is also possible to change absolute values and dependencies of the setpoint.
  • the invention makes it possible to enable a maximum lifetime of gas discharge lamps in a dimming operation, since the gas discharge lamps coils can be kept at emission temperature. Once the setpoint has been reached, the T 0n time of the primary-side switch of the transformer can be reduced again.
  • the determination of the voltage and / or the current at the coil can be made by a hardware or software component and depending on a recognized lamp type.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

L'invention concerne un ballast pour au moins une lampe à décharge, comprenant un circuit de charge auquel la lampe à décharge doit être raccordée, un circuit de chauffage, de préférence cadencé, commandé par un commutateur et destiné à au moins un filament de la lampe à décharge, et un circuit de commande, ce dernier détectant directement ou indirectement la température d'au moins un filament sur la base d'au moins un paramètre de température de préférence électrique, tel que par exemple une tension et/ou un courant appliqué(e) audit au moins un filament. Le circuit de commande utilise le paramètre de température déterminé en tant que valeur réelle pour une régulation d'une puissance calorifique afin de réguler, en fonction du paramètre de température, la puissance calorifique électrique acheminée au filament par commande, de préférence par cadencement du commutateur du circuit de chauffage. L'invention concerne en outre un procédé pour réguler une tension de filament d'une lampe à décharge ainsi qu'un circuit pour la mise en oeuvre dudit procédé.
EP11815746.0A 2010-12-23 2011-12-21 Chauffage de filament régulé pour lampes à décharge Withdrawn EP2656697A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201010064032 DE102010064032A1 (de) 2010-12-23 2010-12-23 Geregelte Wendelheizung für Gasentladungslampen
PCT/AT2011/000507 WO2012083327A2 (fr) 2010-12-23 2011-12-21 Chauffage de filament régulé pour lampes à décharge

Publications (1)

Publication Number Publication Date
EP2656697A2 true EP2656697A2 (fr) 2013-10-30

Family

ID=45562646

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11815746.0A Withdrawn EP2656697A2 (fr) 2010-12-23 2011-12-21 Chauffage de filament régulé pour lampes à décharge

Country Status (3)

Country Link
EP (1) EP2656697A2 (fr)
DE (1) DE102010064032A1 (fr)
WO (1) WO2012083327A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013207327A1 (de) 2013-04-23 2014-10-23 Tridonic Gmbh & Co. Kg Konvertermodul zum Betrieb von Leuchtmitteln, mit potentialtrennendem getakteten Wandler
DE102015107694A1 (de) * 2015-05-18 2016-11-24 Zed Ziegler Electronic Devices Gmbh Gasentladungslampe sowie Vorrichtung zu deren Temperierung

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4218959A1 (de) * 1991-07-11 1993-01-14 Bosch Gmbh Robert Schaltungsanordnung zum betrieb einer leuchtstofflampe
DE10016035A1 (de) 2000-03-31 2001-10-18 Trilux Lenze Gmbh & Co Kg Verfahren und Vorschaltgerät zum Dimmen einer mit einer Leuchtstofflampe versehenen Leuchte
DE10129755A1 (de) * 2001-06-20 2003-01-02 Wilken Wilhelm Betriebsgerät für Leuchtstoffröhren mit eingebauter Kühlstelle
EP1452073A1 (fr) * 2001-11-23 2004-09-01 Koninklijke Philips Electronics N.V. Dispositif de chauffage d'electrodes d'une lampe a decharge
DE102005057107B4 (de) * 2004-11-25 2013-11-14 Kk Elektrotechnik Gmbh Vorschaltgerät
RU2008107579A (ru) * 2005-08-03 2009-09-10 Эксесс Бизнесс Груп Интернешнл ЛЛС (US) Газоразрядная лампа с индуктивным питанием
DE102007016322A1 (de) * 2007-04-04 2008-10-09 Tridonicatco Gmbh & Co. Kg Schaltung zur Wendelheizung
DE102008012452A1 (de) * 2008-03-04 2009-09-10 Tridonicatco Gmbh & Co. Kg Schaltung zum Beheizen und Überwachen der Heizwendeln mindestens einer mit einem elektronischen Vorschaltgerät betriebenen Gasentladungslampe auf Wendelbruch
DE102009021048A1 (de) * 2008-06-09 2009-12-10 Tridonicatco Gmbh & Co. Kg Schaltung zum Beheizen wenigstens einer Heizwendel einer Gasentladungslampe, und Beleuchtungssystem

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2012083327A2 *

Also Published As

Publication number Publication date
WO2012083327A3 (fr) 2012-09-07
WO2012083327A2 (fr) 2012-06-28
DE102010064032A1 (de) 2012-06-28

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