EP2526739B1 - Ballast électronique pour faire fonctionner une lampe hybride - Google Patents

Ballast électronique pour faire fonctionner une lampe hybride Download PDF

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Publication number
EP2526739B1
EP2526739B1 EP11804983.2A EP11804983A EP2526739B1 EP 2526739 B1 EP2526739 B1 EP 2526739B1 EP 11804983 A EP11804983 A EP 11804983A EP 2526739 B1 EP2526739 B1 EP 2526739B1
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EP
European Patent Office
Prior art keywords
coupled
control
electronic ballast
input
electrode
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.)
Not-in-force
Application number
EP11804983.2A
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German (de)
English (en)
Other versions
EP2526739A2 (fr
Inventor
Maximilian Gerber
Siegfried Mayer
Thomas Pollischansky
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.)
Osram GmbH
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Osram GmbH
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Publication of EP2526739A2 publication Critical patent/EP2526739A2/fr
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Not-in-force legal-status Critical Current
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    • 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
    • H05B35/00—Electric light sources using a combination of different types of light generation

Definitions

  • the present invention relates to an electronic ballast for operating a hybrid lamp with at least one discharge lamp and at least one LED.
  • the electronic ballast comprises a preheating device for preheating the at least one discharge lamp, the preheating device comprising a transformer, a first electronic switch having a working electrode, a reference electrode and a control electrode, a first diode and a first ohmic resistor, wherein the series connection of the primary winding of the transformer in that the distance between the working electrode reference electrode of the first electronic switch, the first diode and the first ohmic resistor is coupled between a supply voltage terminal and a reference potential, and a control device with at least one first output for activating the at least one discharge lamp, a second output for activating the at least one an LED, a third output coupled at least to the control electrode of the first electronic switch and an input for measuring the preheat current during preheating of the m at least one discharge lamp is coupled to the first ohmic resistor.
  • Hybrid lights are usually realized with two separate ballasts, one for operating the at least one discharge lamp and one for operating the at least one LED.
  • Each electronic ballast is connected to the supply network via its own power cable and can be activated separately.
  • a control signal is to be supplied to the control device to toggle between discharge lamp operation and LED operation.
  • a control signal a signal can be used which is either coupled to a Netzpol or open.
  • Such control devices are usually realized as an ASIC or as a microcontroller. Since most control devices in such a circuit environment already have all the pins occupied for other functionalities, it is necessary to use a more expensive control device with more pins. This is reflected in undesirably high additional costs.
  • the object of the present invention is therefore to develop an aforementioned electronic ballast such that the conditions for switching back and forth between fluorescent lamp operation and LED operation are created in the most cost-effective manner possible.
  • a control device is used by way of example as a control device, which is usually used in a ballast for discharge lamps. This controls the switches of a half-bridge via two outputs, as is usually used to control the discharge lamp. It also has an output with which a driver device for operating the at least one LED can be activated.
  • the present invention is based on the recognition that no additional input, ie no additional pin, is required at the control device for the control signal when an input channel of the control device is used twice. Upon careful analysis of the signals at the inputs of such a controller, it has been found that an input is used to measure the preheat current during the preheat phase of the discharge lamp.
  • the present invention is now based in particular on the recognition that in the preheating phase no recognition of a control signal for switching back and forth between discharge lamp operation and LED operation is necessary. This is because at the latest 100 ms, typically even 50 ms, is decided after applying the supply voltage to the electronic ballast, whether discharge lamp operation or LED operation is required.
  • the signal is evaluated at the control input and, depending on switched to LED mode or preheating the coils of the at least one discharge lamp initiated to then ignite the at least one discharge lamp.
  • preheating there is no evaluation of the signal at the control input.
  • After completion of the preheating can then be switched by a corresponding signal at the control input again between discharge lamp operation and LED operation. This also applies if LED operation was selected at the first switch-on by a corresponding signal at the control input. Then, when the LEDs are also continuously evaluated, the signal at the control input and by a corresponding signal can be switched to discharge lamp operation including preheating.
  • an electronic ballast further comprises a control input for applying a control signal in order to switch between an operation of the at least one fluorescent lamp and an operation of the at least one LED; a second electronic switch having a working electrode, a reference electrode and a control electrode, wherein the control electrode of the second electronic switch is coupled to the third output of the control device, wherein the reference electrode is coupled to the reference potential, wherein the working electrode is coupled to the control input, and a second diode coupled between the working electrode of the second electronic switch and the input of the control device.
  • a voltage divider is coupled between the control input and the input of the control device. This serves to divide the control signal, which is at the level of the mains AC voltage, to an order of magnitude that can be evaluated by a control device, which is usually realized as an IC or microcontroller.
  • a low pass is serially coupled to the input of the control device. This serves to averaging the voltage drop across the first ohmic resistance, which is correlated with the preheating current, so that a reliable evaluation by the control device can take place.
  • the low-pass filter preferably comprises a second ohmic resistor which is serially coupled between the series connection of the first diode and the first ohmic resistor on the one hand and the input of the control device on the other hand.
  • the second ohmic resistance can also be used for voltage division of the mains AC voltage at the control input.
  • the second ohmic resistance is preferably between 0.1 and 10 k ⁇ , in particular 1 k ⁇ .
  • the second diode is coupled to the coupling point of the second ohmic resistor and the input of the control device. This will do that On the one hand, the signal applied to the control input can be reliably applied to the input of the control device; on the other hand, despite the second electronic switch being switched on, a reliable evaluation of the voltage drop across the first ohmic resistor, which is correlated with the preheating current, can be made at the input of the control device.
  • the low pass further comprises the parallel connection of a third ohmic resistor and a capacitor.
  • the low pass is preferably designed such that it has a cutoff frequency between 1 and 100 kHz, in particular 10 kHz.
  • the cutoff frequency is well below the preheat frequency, which is usually between 100 kHz and 130 kHz.
  • the mean value of the preheating current is therefore evaluated; the evaluation of the control signal, however, takes place via a peak value determination.
  • a first inverter is coupled between the third output of the control device and the control electrode of the first electronic switch. This serves to increase the level at the third output of the control device, which is usually about 3 V, to a value which is sufficient to drive the control electrode of the first electronic switch. This usually requires 15V.
  • a second inverter is preferably coupled between the third output of the control device and the control electrode of the second electronic switch.
  • the electronic ballast further comprises a fourth diode which is coupled in anti-parallel to the series connection of the first diode and the first ohmic resistor. This diode serves as a freewheeling diode for the negative current components through the first electronic switch. This ensures that only positive current components are evaluated during the preheating of the control device and thus a meaningful averaging is only possible.
  • control signal preferably represents a network signal.
  • Fig. 1 shows a schematic representation of a first embodiment of an electronic ballast according to the invention.
  • This comprises a control device 10, which comprises two outputs A1a, Alb, in order to control the switches of an inverter whose load circuit is coupled to at least one discharge lamp FL. It also comprises an output A2, which is designed to drive a driver module for operating at least one LED.
  • the series connection of a transformer Tr which has a primary winding L1A and a secondary winding L1B, an electronic switch M1, a diode D1 and an ohmic resistor R1 is provided between a supply voltage V c and a reference potential is coupled.
  • the coils of the at least one discharge lamp FL are coupled in a known manner to the secondary winding L1B of the transformer Tr.
  • the switch M1 which is preferably realized as a transistor having a control electrode, working electrode and reference electrode, an output A3 of the control device 10 is provided, wherein in the present case an inverter is coupled between the output A3 and the switch M1.
  • a diode D3 which is connected in antiparallel to the series circuit of the diode D1 and the ohmic resistor R1, serves as a freewheeling diode for negative current components in the preheating, to allow meaningful averaging.
  • the controller 10 may of course have a variety of other inputs and outputs. Also, the output A2 can be used twice by appropriate, but not relevant measures here.
  • the circuit arrangement described so far is known with the exception of the use of the output A2 of the control device 10.
  • the assembly indicated at 12 now includes the components necessary to enable switching between LED operation and fluorescent lamp operation by evaluating the control signal at input E1 of controller 10 outside the preheat phase of the filaments of the at least one discharge lamp.
  • the control signal applied to the control input St can in particular represent a network signal. It is connected via a resistor R8 to the working electrode of a second electronic switch M4 whose reference electrode is grounded.
  • the control electrode of the second electronic switch M4 like the control electrode of the first electronic switch M1, is coupled to the output A3 of the control device 10. Between the output A3 of the control device 10 and the control electrode of the switch M4, as well as in the electronic switch M1, an inverter is coupled.
  • the working electrode of the second electronic switch M4 is coupled to the reference electrode of the first electronic switch M1 via a diode D2.
  • the output A3 of the control device 10 is at high potential, that is logic "1".
  • both the switch M1 and the switch M4 is not turned on. Accordingly, no preheating current flows more and at the input E1 of the control device 10, a signal can be evaluated, which is proportional to the control signal at the control input St of the electronic ballast.
  • Fig. 3 shows a schematic representation of a second embodiment of an electronic ballast according to the invention. This essentially corresponds to the one in Fig. 1 schematically illustrated embodiment, but some of the in Fig. 1 only schematically illustrated assemblies are shown in more detail. So becomes a first Inverter, which is coupled between the control electrode of the switch M1 and the output A3 of the control device 10, formed by an assembly comprising the ohmic resistors R2, R3, R4 and a further electronic switch M2, the working electrode via the resistor R3 with a Voltage supply V 1 is coupled.
  • a first Inverter which is coupled between the control electrode of the switch M1 and the output A3 of the control device 10, formed by an assembly comprising the ohmic resistors R2, R3, R4 and a further electronic switch M2, the working electrode via the resistor R3 with a Voltage supply V 1 is coupled.
  • the second inverter coupled between the output A3 and the control electrode of the switch M4, comprises ohmic resistors R5 and R6 and a further electronic switch M3. No additional ohmic resistance then needs to be provided between the working electrode of the switch M3 and the control electrode of the switch M4, if the resistance R Dson of the switch M3 is large enough, for example of the order of 10 ⁇ .
  • a low-pass filter is connected, which comprises the parallel connection of an ohmic resistor R10 and a capacitor C1.
  • a voltage divider is formed by the series connection of the ohmic resistor R8 with a combination comprising a parallel connection of the resistor R10 to a series connection of the resistors R9 and R1.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)

Claims (12)

  1. Ballast électronique pour faire fonctionner un luminaire hybride équipé d'au moins une lampe à décharge (FL) et d'au moins une DEL, comprenant
    - un dispositif de préchauffage destiné à préchauffer la ou les lampes à décharge (FL), ledit dispositif de préchauffage comprenant un transformateur (Tr), un premier commutateur électronique (M1) doté d'une électrode de travail, d'une électrode de référence et d'une électrode de commande, une première diode (D1) et une première résistance ohmique (R1), le montage en série de l'enroulement primaire (L1A) du transformateur (Tr), de la section électrode de travail/électrode de référence du premier commutateur électronique (M1), de la première diode (D1) et de la première résistance ohmique (R1) étant couplé entre une borne de tension d'alimentation (Vc) et un potentiel de référence ; et
    - un dispositif de commande (10) comportant
    au moins une première sortie (A1a, A1b) pour commander la ou les lampes à décharge (FL) ;
    une deuxième sortie (A2) pour commander la ou les DEL ;
    une troisième sortie (A3), couplée au moins à l'électrode de commande du premier commutateur électronique (M1) ; et
    une entrée (E1), couplée à la première résistance ohmique (R1) pour mesurer le courant de préchauffage pendant le préchauffage de la ou des lampes à décharge (FL) ;
    caractérisé en ce que le ballast électronique comprend en outre :
    - une entrée de commande (St) pour appliquer un signal de commande, destinée à commuter entre un fonctionnement de la ou des lampes à décharge et un fonctionnement de la ou des DEL ;
    - un deuxième commutateur électronique (M4) doté d'une électrode de travail, d'une électrode de référence et d'une électrode de commande, l'électrode de commande du deuxième commutateur électronique (M4) étant couplée à la troisième sortie (A3) du dispositif de commande (10), l'électrode de référence étant couplée au potentiel de référence, l'électrode de travail étant couplé à l'entrée de commande (St) ; et
    - une deuxième diode (D2), couplée entre l'électrode de travail du deuxième commutateur électronique (M4) et l'entrée (E1) du dispositif de commande (10).
  2. Ballast électronique selon la revendication 1,
    caractérisé en ce qu'un diviseur de tension (R8, R10, R9, R1) est couplé entre l'entrée de commande (st) et l'entrée du dispositif de commande (10).
  3. Ballast électronique selon l'une des revendications 1 ou 2,
    caractérisé en ce qu'un passe-bas (TP) est couplé en série à l'entrée du dispositif de commande (10).
  4. Ballast électronique selon la revendication 3,
    caractérisé en ce que le passe-bas (TP) comprend une deuxième résistance ohmique (R9), couplée en série entre le montage en série de la première diode (D1) et de la première résistance ohmique (R1) d'une part et l'entrée (E1) du dispositif de commande (10) d'autre part.
  5. Ballast électronique selon la revendication 4,
    caractérisé en ce que la deuxième résistance ohmique (R9) est comprise entre 0,1 et 10 kΩ, en particulier égale à 1 kΩ.
  6. Ballast électronique selon l'une des revendications 4 ou 5,
    caractérisé en ce que la deuxième diode (D2) est couplée au point de couplage de la deuxième résistance ohmique (R9) et de l'entrée (E1) du dispositif de commande (10).
  7. Ballast électronique selon l'une des revendications 3 à 6,
    caractérisé en ce que le passe-bas (TP) comprend en outre le montage en parallèle d'une troisième résistance ohmique (R10) et d'un condensateur (C1).
  8. Ballast électronique selon l'une des revendications 3 à 7,
    caractérisé en ce que le passe-bas (TP) possède une fréquence de coupure comprise entre 1 et 100 kHz, en particulier égale à 10 kHz.
  9. Ballast électronique selon l'une des revendications précédentes,
    caractérisé en ce qu'un premier inverseur (R4, M2, R3, R2) est couplé entre la troisième sortie (A3) du dispositif de commande (10) et l'électrode de commande du premier commutateur électronique (M1).
  10. Ballast électronique selon l'une des revendications précédentes,
    caractérisé en ce qu'un deuxième inverseur (R6, M3, R5) est couplé entre la troisième sortie (A3) du dispositif de commande (10) et l'électrode de commande du deuxième commutateur électronique (M4).
  11. Ballast électronique selon l'une des revendications précédentes,
    caractérisé en ce que le ballast électronique comprend en outre une troisième diode (D3), couplée en antiparallèle au montage en série de la première diode (D1) et de la première résistance ohmique (R1).
  12. Ballast électronique selon l'une des revendications précédentes,
    caractérisé en ce que le signal de commande est un signal de secteur.
EP11804983.2A 2010-12-23 2011-12-12 Ballast électronique pour faire fonctionner une lampe hybride Not-in-force EP2526739B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201010064069 DE102010064069A1 (de) 2010-12-23 2010-12-23 Elektronisches Vorschaltgerät zum Betreiben einer Hybridleuchte
PCT/EP2011/072466 WO2012084577A2 (fr) 2010-12-23 2011-12-12 Ballast électronique pour faire fonctionner une lampe hybride

Publications (2)

Publication Number Publication Date
EP2526739A2 EP2526739A2 (fr) 2012-11-28
EP2526739B1 true EP2526739B1 (fr) 2014-02-19

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EP11804983.2A Not-in-force EP2526739B1 (fr) 2010-12-23 2011-12-12 Ballast électronique pour faire fonctionner une lampe hybride

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EP (1) EP2526739B1 (fr)
DE (1) DE102010064069A1 (fr)
WO (1) WO2012084577A2 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007066252A1 (fr) * 2005-12-09 2007-06-14 Koninklijke Philips Electronics N.V. Procédé d'attaque d'une lampe hybride et ensemble lampe hybride
US8264159B2 (en) * 2007-06-29 2012-09-11 Osram Ag Circuit arrangement and method for operating at least one LED and at least one fluorescent lamp
US7759880B2 (en) * 2008-02-12 2010-07-20 General Electric Company Combined ballast for fluorescent lamp and light emitting diode and method of driving same

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Publication number Publication date
WO2012084577A3 (fr) 2012-08-30
WO2012084577A2 (fr) 2012-06-28
EP2526739A2 (fr) 2012-11-28
DE102010064069A1 (de) 2012-06-28

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