EP1280388A1 - Ballast électronique avec un mode de préchauffage - Google Patents

Ballast électronique avec un mode de préchauffage Download PDF

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Publication number
EP1280388A1
EP1280388A1 EP02012639A EP02012639A EP1280388A1 EP 1280388 A1 EP1280388 A1 EP 1280388A1 EP 02012639 A EP02012639 A EP 02012639A EP 02012639 A EP02012639 A EP 02012639A EP 1280388 A1 EP1280388 A1 EP 1280388A1
Authority
EP
European Patent Office
Prior art keywords
control circuit
circuit
supply voltage
failure
electronic ballast
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
Application number
EP02012639A
Other languages
German (de)
English (en)
Other versions
EP1280388B1 (fr
Inventor
Stefan Zudrell-Koch
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.)
Tridonicatco GmbH and Co KG
Original Assignee
Tridonicatco 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 Tridonicatco GmbH and Co KG filed Critical Tridonicatco GmbH and Co KG
Publication of EP1280388A1 publication Critical patent/EP1280388A1/fr
Application granted granted Critical
Publication of EP1280388B1 publication Critical patent/EP1280388B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H05B41/295—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
    • H05B41/298—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2981—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
    • H05B41/2983—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
    • H05B41/295—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 present invention relates to an electronic ballast for operating at least one gas discharge lamp according to the preamble of claim 1.
  • the ignition of a gas discharge lamp is for their spirals a relatively high load.
  • the lamp filaments are usually pre-heated before the ignition of the lamp, since the ignition process is gentler for the coils, if they already have a certain temperature , In this case, a heating current is applied to the coils for a short period of time. Only when this has reached a suitable temperature, the ignition voltage required for ignition is applied to the lamp.
  • Modern ballasts are typically designed to automatically perform such a preheat cycle prior to each ignition of the lamp.
  • an electronic ballast which has a control circuit which determines the duration of the power failure in the event of a power failure. If the duration of the power failure exceeds a predetermined maximum time, the lamp filaments are preheated before the lamp is restarted, but if the duration of the power failure is shorter than the maximum time, preheating of the lamp filaments is dispensed with and the lamp is immediately extinguished ignited.
  • the determination of the duration of the power failure takes place in the abovementioned WO 99/34648 A1 in that an RC element connected to the control circuit is charged to a specific supply voltage potential after the lamp has been ignited. If the power supply fails at a later time, then the capacitor discharged with a predetermined by the elements of the RC element and thus known dynamics. When the power supply returns, the control circuit determines the voltage still applied to the capacitor and compares it with a reference value which corresponds to the predetermined maximum duration up to which no preheating operation is to be performed. If the voltage applied to the capacitor of the RC element voltage is above the reference voltage, the gas discharge lamp is ignited instantly, however, is the voltage below the reference value, a regular lamp start is performed with preheating.
  • the control circuit as well as the other components of the electronic ballast for the duration of the power failure receives no energy and is thus completely disabled. Accordingly, to determine the duration of the power failure, an external element such as the RC element must be used, which is relatively expensive for this purpose. Rather, there is a need to avoid such an external element and to integrate the determination of the duration of the power failure in the control circuit itself.
  • the present invention is therefore based on the object to design an electronic ballast for operating a gas discharge lamp such that a control circuit for controlling the operation of the gas discharge lamp without the use of an external element is able to determine the duration of a temporary power failure.
  • the ballast according to the invention comprises a rectifier circuit which is connectable to a supply voltage, a connected to the output of the rectifier circuit smoothing circuit for generating a DC link voltage, an energy storage element, which is fed with the DC link voltage, a connected to the energy storage element inverter at the output of a terminal for the lamp-containing load circuit is connected, and a control circuit for controlling the operation of the gas discharge lamp.
  • the control circuit starts the gas discharge lamp after a temporary failure of the supply voltage depending on the duration of this failure either with a preheat operation for preheating the lamp filaments or without preheating. For this purpose, it monitors the state of the supply voltage and stops the inverter for the duration of the failure on detection of a failure of the supply voltage.
  • control circuit is powered by the energy storage element during the failure.
  • the control circuit remains activated during the power failure at least to the extent that it is itself able to determine the duration of the failure, since it continues to monitor the value of the input voltage to detect the restoration of the power supply.
  • the use of an external time determination element can thus be dispensed with.
  • Another advantage of the present invention is that there is the possibility of storing in the control circuit the current state of the lamp so that it can then operate the lamp in the same state as before the power failure after a return of the power supply. This is also made possible by the fact that the control circuit uses the residual energy present in the energy storage element during the power failure.
  • the control circuit preferably also shuts down the smoothing circuit in order to minimize the power consumption of the entire electronic ballast.
  • the smoothing circuit is preferably a switching regulator, in particular a boost converter, the energy storage element is preferably formed by a storage capacitor.
  • a particularly advantageous embodiment of the ballast according to the invention is that the control circuit operates digitally at least in terms of monitoring the duration of a power failure.
  • the control circuit has an analog / digital converter on the input side, which converts the rectified supply voltage supplied to the smoothing circuit into a digital value.
  • this digital operating parameter is compared with a reference value, wherein the control circuit switches off the inverter immediately when the internal reference value is undershot.
  • a digitally configured timer circuit is provided, which measures the duration of the power failure.
  • the ballast is connected on the input side via a high-frequency filter 1 to the mains supply voltage U 0 .
  • a rectifier circuit 2 in the form of a full-bridge rectifier, which converts the mains supply voltage U 0 in a rectified input voltage U i for the smoothing circuit 3.
  • the smoothing circuit 3 in turn serves for harmonic filtering and smoothing of the input voltage U i and for this purpose comprises a smoothing capacitor C1 and an inductor L1, a controllable switch in the form of a MOS field effect transistor S1 and a diode D1 having boost converter.
  • boost converter shown here, other switching regulators can be used.
  • an intermediate circuit voltage U z applied across the storage circuit C2 following the smoothing circuit 3 is generated, which is supplied to the inverter 4.
  • the inverter 4 is formed by two arranged in a half-bridge arrangement MOS field effect transistors S2 and S3, wherein an alternating voltage is generated by a high frequency driving these two field effect transistors S2, S3 at the center tap, which is supplied to the load circuit 5 with the gas discharge lamp LA connected thereto. This is done in a known manner and should therefore not be further explained below.
  • the driving of the three MOS field effect transistors S1 to S3 of the smoothing circuit 3 and of the inverter 4 is effected by a control circuit 6 which generates corresponding switching information and transmits it to a driver circuit 7 adjoining the control circuit 6.
  • the driver circuit 7 converts the switching information into corresponding control signals and controls the gates of the three MOS field-effect transistors S1 to S3 via the lines 14 to 16.
  • the load circuit 5 in particular contains two heating circuits H1 and H2, in each of which one of the two coils W1, W2 of the gas discharge lamp LA is arranged. In order to preheat the two coils W1, W2 before igniting the gas discharge lamp LA, a corresponding heating current is applied to the two heating circuits H1, H2.
  • the two coils W1 and W2 which represent ohmic resistances, are heated until they reach a temperature at which the lamp LA can be ignited with as little stress as possible for the two coils W1, W2.
  • the control circuit 6 is supplied via the line 12 with the supply voltage rectified by the rectifier 2, which represents the input voltage U i for the smoothing circuit 3.
  • the analog input signal is converted by a located in the control circuit 6 analog / digital converter ADC into a digital signal, a the analog / digital converter ADC downstream voltage detection block 8 compares the digital value with a predetermined reference value.
  • the voltage detection block 8 and the other components of the control circuit 6 operate completely digitally, whereby the greatest possible integration of the various functions is achieved.
  • a central clock 9 is provided, which generates a clock signal and transmitted to all components of the control circuit 6.
  • the control circuit 6 Based on the performed by the voltage detection block 8 comparison between the input voltage U i for the smoothing circuit 3 corresponding digital value and the reference value, it is determined whether a proper power supply is present at the input of the electronic ballast. If the detected voltage U i falls below the reference value, this is interpreted as a failure of the power supply. The control circuit 6 then immediately transmits a corresponding signal to the driver circuit 7 in order to shut down the two MOS field-effect transistors S2, S3 of the inverter 4. As a result, further consumption of the energy stored in the storage capacitor C2 is immediately prevented by the inverter 4. In addition, the switch S1 of the boost converter is shut down.
  • a possible immediate shutdown of the inverter 4 is therefore important, since the stored energy in the storage capacitor C2 during the failure of the Power supply for the control circuit 6 is used.
  • the storage capacitor C2 ensures the energy supply of the control circuit 6 as an energy storage element for the duration of the power failure. This is achieved in that the voltage applied to the storage capacitor C2 DC link voltage U Z via a supply line 13, in which a resistor R1 is, the control circuit 6 is supplied.
  • the further operation of the control circuit 6 is made possible for a certain period of time.
  • the functionality of the control circuit 6 is ensured at least for the period in which, after a return of the mains supply, no preheating operation is carried out for the lamp filaments W1 and W2 but the lamp LA is to be ignited instantaneously.
  • the duration of the failure of the power supply is determined by a provided in the control circuit 6 timer circuit 10, which may be formed, for example in the form of a digital counter, which begins to count backwards after a failure of the mains supply voltage. Alternatively, another embodiment of the timer circuit 10 would be possible.
  • the signals of the current detection block 8 and the timer circuit 10 are fed to a control block 11, which performs a corresponding operation of the electronic ballast depending on the signals.
  • the control block after a power failure for the instantaneous shutdown of the inverter 4 and the smoothing circuit 3. If later detected by the current detection block 8, the restoration of the power supply, the control block 11 provides for the duration of the power supply failure corresponding restart of the lamp LA , In particular, this means that a preheating of the lamp filaments W1, W2, is dispensed with when the supply voltage U 0 before the completion of the counting cycle of the timer circuit 10 returns. If, on the other hand, the end of the counting cycle has already been reached, a normal preheating operation is carried out before the lamp LA is ignited.
  • the operation of the control circuit 6 according to the invention is schematically summarized in the block diagram in Fig. 2, which illustrate the various phases of lamp operation.
  • the first step 20 consists in switching on the mains supply voltage. Then, in the subsequent blocks 21 and 22, an initialization of the entire ballast and a preheating of the lamp filaments is performed. After completion of the Vorholiczyklusses in step 23, the ignition of the lamp, which is then in the normal operating state 24.
  • This waiting state 25 is characterized in that the smoothing circuit 3 and in particular the inverter 4 of the ballast are shut down and the power supply of the control circuit 6 is effected by the storage capacitor C2.
  • the control circuit 6 continuously checks whether the normal mains supply has been restored. If this is the case, the lamp is ignited immediately, avoiding the pre-heating cycle, but only if the mains supply returns within a specified period of time. In the waiting state 25, therefore, the elapsed time t since the power supply failure is determined. Corresponds to the elapsed time t a predetermined maximum value T max and thus was exceeded the allowable time for a restart without preheating, the control circuit goes into a second wait state 26 on.
  • control circuit merely waits for the mains supply to be restored. If so, a conventional lamp start is performed, i. the control circuit reverts to the state of the initialization phase 21, carries out a normal preheating of the lamp filaments and then an ignition of the lamp.
  • the solution according to the invention thus ensures that it can be determined with high reliability whether the maximum time duration for a failure of the power supply, in which after a return of the supply voltage no preheating operation must be performed before a renewed ignition of the lamp has been exceeded.
  • the control circuit can also be designed so that it "remembers" the state of the lamp, which was present just before the failure of the power supply, and continues to operate the lamp in exactly the same state after restoration of the power supply.
  • control circuit This can also be kept very compact and dispensed with the use of an external element for measuring the duration of the power failure.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Dc-Dc Converters (AREA)
  • Inverter Devices (AREA)
EP02012639A 2001-07-16 2002-06-06 Ballast électronique avec un mode de préchauffage Expired - Lifetime EP1280388B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10134566 2001-07-16
DE10134566A DE10134566A1 (de) 2001-07-16 2001-07-16 Elektronisches Vorschaltgerät mit Vorheizbetrieb

Publications (2)

Publication Number Publication Date
EP1280388A1 true EP1280388A1 (fr) 2003-01-29
EP1280388B1 EP1280388B1 (fr) 2004-09-08

Family

ID=7691978

Family Applications (1)

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EP02012639A Expired - Lifetime EP1280388B1 (fr) 2001-07-16 2002-06-06 Ballast électronique avec un mode de préchauffage

Country Status (3)

Country Link
EP (1) EP1280388B1 (fr)
AT (1) ATE275811T1 (fr)
DE (2) DE10134566A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007025976A1 (fr) * 2005-08-31 2007-03-08 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Ballast pour une lampe a decharge a prechauffage adaptatif
WO2007028777A1 (fr) * 2005-09-07 2007-03-15 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Circuiterie et procede pour faire fonctionner une lampe a decharge
DE102008030412B4 (de) 2007-07-17 2019-09-05 Infineon Technologies Austria Ag Verfahren zur Steuerung eines Lampenvorschaltgeräts und Ansteuerschaltung

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005058574B4 (de) * 2005-12-08 2016-03-24 Hella Kgaa Hueck & Co. Vorrichtung zum Steuern der Zusatzleistung einer Gasentladungslampe mit einem Oszillator, dessen Frequenz zum Ersetzen eines RC-Zeitgliedes geändert wird

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0439240A2 (fr) * 1990-01-20 1991-07-31 SEMPERLUX GmbH, LICHTTECHNISCHES WERK Ballast électronique
WO1995010168A1 (fr) * 1993-10-01 1995-04-13 C.M. Personnel Participation B.V. Ballast electronique pour lampe a gaz a decharge
WO1997043878A1 (fr) * 1996-05-10 1997-11-20 Philips Electronics N.V. Ballast electronique
WO1998046053A2 (fr) * 1997-04-10 1998-10-15 Koninklijke Philips Electronics N.V. Systeme anti-tremblotement pour organe de commande de ballast de lampe fluorescente
WO1999034648A1 (de) * 1997-12-23 1999-07-08 Tridonic Bauelemente Gmbh Elektronisches vorschaltgerät

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0439240A2 (fr) * 1990-01-20 1991-07-31 SEMPERLUX GmbH, LICHTTECHNISCHES WERK Ballast électronique
WO1995010168A1 (fr) * 1993-10-01 1995-04-13 C.M. Personnel Participation B.V. Ballast electronique pour lampe a gaz a decharge
WO1997043878A1 (fr) * 1996-05-10 1997-11-20 Philips Electronics N.V. Ballast electronique
WO1998046053A2 (fr) * 1997-04-10 1998-10-15 Koninklijke Philips Electronics N.V. Systeme anti-tremblotement pour organe de commande de ballast de lampe fluorescente
WO1999034648A1 (de) * 1997-12-23 1999-07-08 Tridonic Bauelemente Gmbh Elektronisches vorschaltgerät

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007025976A1 (fr) * 2005-08-31 2007-03-08 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Ballast pour une lampe a decharge a prechauffage adaptatif
US8134297B2 (en) 2005-08-31 2012-03-13 Osram Ag Ballast for a discharge lamp with adaptive preheating
WO2007028777A1 (fr) * 2005-09-07 2007-03-15 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Circuiterie et procede pour faire fonctionner une lampe a decharge
DE102005042527B4 (de) * 2005-09-07 2015-10-29 Osram Gmbh Schaltungsanordnung und Verfahren zum Betreiben einer Entladungslampe
DE102008030412B4 (de) 2007-07-17 2019-09-05 Infineon Technologies Austria Ag Verfahren zur Steuerung eines Lampenvorschaltgeräts und Ansteuerschaltung

Also Published As

Publication number Publication date
ATE275811T1 (de) 2004-09-15
DE10134566A1 (de) 2003-02-06
DE50200946D1 (de) 2004-10-14
EP1280388B1 (fr) 2004-09-08

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