EP2184956A2 - Appareil de montage électronique, appareil d'éclairage et son procédé de fonctionnement - Google Patents

Appareil de montage électronique, appareil d'éclairage et son procédé de fonctionnement Download PDF

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Publication number
EP2184956A2
EP2184956A2 EP09014098A EP09014098A EP2184956A2 EP 2184956 A2 EP2184956 A2 EP 2184956A2 EP 09014098 A EP09014098 A EP 09014098A EP 09014098 A EP09014098 A EP 09014098A EP 2184956 A2 EP2184956 A2 EP 2184956A2
Authority
EP
European Patent Office
Prior art keywords
shunt
measuring input
electronic ballast
diode
limiting circuit
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Withdrawn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
EP09014098A
Other languages
German (de)
English (en)
Other versions
EP2184956A3 (fr
Inventor
Stefan Honerkamp
Otto Meyer
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.)
BAG Engineering GmbH
Original Assignee
HUECO LIGHTRONIC GmbH
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 HUECO LIGHTRONIC GmbH filed Critical HUECO LIGHTRONIC GmbH
Publication of EP2184956A2 publication Critical patent/EP2184956A2/fr
Publication of EP2184956A3 publication Critical patent/EP2184956A3/fr
Withdrawn legal-status Critical Current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
    • 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
    • H05B41/2825—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 by means of a bridge converter in the final stage
    • H05B41/2828—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 by means of a bridge converter in the final stage using control circuits for the switching elements

Definitions

  • the present invention relates to an electronic ballast for operating at least one lamp, preferably a gas discharge lamp, with a center tap arranged between a first and a second switch to which a choke and a first capacitor are coupled in series, preferably with a further lying at a reference potential Capacitor, wherein the first capacitor is preferably connected directly to a terminal for the lamp, as well as having a measuring input having IC, which is provided for controlling the ballast, wherein the measuring input between a connected to the reference potential shunt and a switch is coupled.
  • the invention relates to a lighting device with a corresponding electronic ballast and a method for operating this, in which a IC having a measuring input a Mittenabgriff a preferably a bridge circuit, in particular a half-bridge circuit ballast by means of a first and a second switch switches to an alternating Potential to apply to a choke and a first capacitor and to supply via this one pole of a lamp, wherein over the measuring input of the IC a voltage drop across a shunt is measured, in particular to detect a dead time for switching on one of the switches and / or trigger a switch-off ,
  • Generic ballasts are equipped with ICs that often bring features such as automatic deadtime detection or saturation control for the lamp inductor according to the manufacturer. Also is often an additional Switch-off threshold implemented for faults in preheated ECGs.
  • the necessary measuring input is in this case designed to measure the current via one, preferably the second switch or a voltage drop across the shunt coupled to the reference potential.
  • a problem may arise if the magnitude of the ignition voltage is adjusted or programmed via the half-bridge shunt. If high ignition voltages are required, for example for series-connected bulbs, the shunt is due to the high current during the ignition phase in the resonant circuit to dimension correspondingly low. The lower the resistance, the higher the set ignition voltage.
  • the resistance falls below a certain value, the dead time detection via the measuring input no longer works, because the triggering threshold for switching on the (eg MOSFET) transistor or switch is no longer achieved. If, on the other hand, higher-impedance shunts are used, too rapid a shutdown takes place in the ignition phase due to the reaching of the shutdown level threshold.
  • the signal dropping at the shunt is varied in its amplitude by means of a circuit, in particular a limiting circuit.
  • a circuit in particular a limiting circuit.
  • the maximum amplitude value which can be seen at the measuring input.
  • it may also be an at least partial stretch or other change in amplitude.
  • the measuring input thus does not directly see the signal dropping at the shunt of the circuit, which is preferably in the form of a half-bridge, but a signal provided with an example of a reduced maximum amplitude.
  • the limiting circuit which can advantageously be tuned to the circuit and / or adapted configured, thus serves the revision of the falling signal / signal level at the shunt, or the voltage dropping at the shunt such that the necessary and for the individual functions of the IC thresholds are achieved. These thresholds may be predetermined or predetermined depending on the IC used. be adjustable. The signal dropping at the shunt can be changed in a linear or nonlinear way.
  • the limiting circuit is coupled between the measuring input and the shunt in the circuit, and switched in particular from the measuring input to the present between shunt and one of the switch line, preferably between shunt and the reference potential switching to the center tap switch or coupled.
  • the limiting circuit is connected to a diode connected to the reference potential or the like.
  • Provided barrier effect circuit which is coupled into the conduction path between shunt and measuring input.
  • the diode presents a very simple and inexpensive way to form a limiting circuit.
  • the forward voltage of the diode already serves a voltage drop, so that the measuring input "sees" a lower signal compared to the signal applied to the shunt.
  • a relatively high-impedance shunt in which a signal is present in the ignition phase whose level is significantly above the ignition voltage control threshold of the IC, which is not seen by the measuring input. At the measuring input, the signal is in the range of the control threshold. An ignition is thus possible despite a high-impedance shunt, since the scheme takes effect later.
  • the selected polarity of the diode ensures that the negative signal components at the shunt are forwarded to the measuring input. The diode blocks the negative signal components against reference potential.
  • the shunt can be dimensioned sufficiently large to generate a sufficient measurement signal at the measuring input even with dimmable devices in which only a small current flows.
  • the limiting circuit according to the invention thus provides a balance between the actually required for an ignition voltage low-resistance (half-bridge) shunt and a sufficiently large-sized shunt for dead time detection.
  • another blocking device which is permeable on one side can be part of the limiting circuit as a component of a plurality of individual components. It is essential here that, due to the blocking of the signal components, either in the direction of plus or in the direction of minus, the signal for deadtime detection which arrives above or falls above the shunt actually reaches the switch-on threshold.
  • the object is achieved according to the mandatory also by a method according to the preamble of claim 8, which is characterized in that the voltage applied to the measuring input signal varies in amplitude by means of a limiting circuit and is limited in particular.
  • Relatively high-impedance shunts can be used since the positive signal components applied to the measuring input do not correspond to the signal applied to the shunt and the ignition voltage control threshold is accordingly reached later.
  • the signal is locked in one direction to provide a sufficient signal in the event of deadtime detection available. It can be assumed here that the relevant signal component dropping off at the shunt during the ignition phase has a different polarity than the signal component for detecting a dead time.
  • the signal components falling at the shunt are referred to as negative signal components by means of a diode or the like. Barrier having device locked to reference potential.
  • a voltage drop for positive signal components which is caused by the sloping at the diode forward voltage to reference potential.
  • a prescribed electronic ballast or the inventive method are then developed particularly advantageous if the voltage applied to the shunt signal is supplied to the measuring input via a voltage divider of the limiting circuit of the electronic ballast. This improves the setting options of the electronic ballast or the adaptation of the method to already known electronic ballasts and special circuits for the operation of particular with high ignition voltages to be operated lamps.
  • the limiting circuit has a arranged in the line branch of the diode additional resistance. This may be part of the voltage divider or without such as part of the limiting circuit for reducing the signal applied to the measuring input of the IC signal.
  • the resistance arranged in the line branch between the line path (between the shunt and the measuring input) and the reference potential is preferably pre-coupled to a diode arranged in the same line branch. However, he can also be linked to this.
  • the limiting circuit further comprises a resistor arranged in the conduction path between shunt and measuring input, which preferably has a resistance value which is greater than that of the shunt.
  • the resistor can form a voltage divider with the additional resistor assigned to a diode.
  • the resistance arranged in the conduction path between the shunt and the measuring input is preferably greater by a factor of at least 50 than the resistance of the shunt, particularly preferably by a factor in the region of 100.
  • the resistance in the conduction path between Shunt and measuring input arranged resistors can be used a variety of conventional IC such as the ICB2FL01 G (Infinion) not only for static ballasts but also for dimmable ballasts.
  • a capacitance is connected in parallel with the diode or in a series circuit comprising the diode in order to act as a filter against high-frequency interference.
  • the capacitance is arranged between the measuring input and the reference potential.
  • An electronic ballast known from the prior art comprises an IC 1 to be used as a control unit, which in a known manner drives a first switch S1 and a second switch S2 in a half-bridge arrangement ( Fig. 1 ).
  • the switches S1 and S2 are arranged between reference, ie preferably ground potential and the intermediate circuit voltage UZ. Between the two switches S1 and S2, a half-bridge center M is formed. From this leads a conduction path via an inductance L1 and a coupling capacitor C1 to a pole of a lamp La. Another pole of the lamp La is connected to the reference potential.
  • Another capacitor C2 is connected as a resonant circuit capacitor with the inductance L1 and the coupling capacitor C1 and on the other hand with reference potential.
  • the IC 1 In addition to the control terminals 2 (for switch S2) and 3 (for switch S1), the IC 1 also has a measuring input CS, via which the current flow through the switch S2 or the voltage dropping at the shunt R1 is recorded and evaluated. Depending on the design of the IC, an ignition voltage control and / or a dead time detection can be realized via this evaluation, which, however, identify the above-described disadvantages of the prior art. In the IC's design as Infinion's ICB2FL01 G, features such as automatic deadtime detection and a shutdown threshold for power preheat ECG faults are implemented.
  • the triggering threshold U tot for the dead time detection at the measuring input CS is safely undercut as soon as the half-bridge voltage at point M has fallen to ground potential.
  • the measuring shunt R1 is dimensioned relatively low in order to achieve high ignition voltages, it can no longer be ensured with sufficient certainty that the voltage dropping there will actually approach the triggering threshold U tot for the deadtime control.
  • the half-bridge driver IC may detect an error case if necessary and activate the protective shutdown.
  • the protective shutdown would be activated.
  • the limiting circuit acting as an additional or limiting circuit comprises an arranged in the conduction path between R1 and CS additional resistance R3, as well as a coupled to the conduction path between R3 and CS line branch with a further resistor R5 and a diode D1.
  • the signal applied at the measuring point P during the ignition phase corresponds to the dot-dash line Uzü (FIG. Fig. 3 ) and is therefore above the also the Fig. 3 removable voltage regulation threshold U R. Due to the additional circuit of the line path leading to the measuring input acting as a limiter, however, only the signal corresponding to the dashed line U CS in FIG. In operation mode (run mode), the curve of the voltage at the measuring input corresponds to the solid line U CSB .
  • Fig. 3 is also apparent that the triggering threshold U tot is sufficiently undershot due to the sufficiently large-sized R1 in a degree .DELTA.V, for example, 0.2 volts, so that the switch S2 is closed correctly. Safe switching of the switch is ensured.
  • R3 and R5 are preferably substantially larger than R1 and are particularly preferably in a ratio between R3 / R5 ⁇ 10 to each other. Depending on the systemic and For component-specific requirements, this value can preferably be in a range between 2 and 100.
  • the limiting circuit in addition to the resistor R3 and R5, a further resistor R4 for forming a voltage divider with R3 and a capacitor C4, which causes the filtering of HF components.
  • the Halbschulnshunt can be supplemented to reduce the individual power losses by another resistor R2, wherein R1 and R2 can then be dimensioned accordingly ( Fig. 4 ).

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  • Circuit Arrangements For Discharge Lamps (AREA)
EP09014098A 2008-11-11 2009-11-11 Appareil de montage électronique, appareil d'éclairage et son procédé de fonctionnement Withdrawn EP2184956A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810056814 DE102008056814A1 (de) 2008-11-11 2008-11-11 Elektronisches Vorschaltgerät, Beleuchtungsgerät und Verfahren zum Betrieb dieser

Publications (2)

Publication Number Publication Date
EP2184956A2 true EP2184956A2 (fr) 2010-05-12
EP2184956A3 EP2184956A3 (fr) 2011-09-21

Family

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EP09014098A Withdrawn EP2184956A3 (fr) 2008-11-11 2009-11-11 Appareil de montage électronique, appareil d'éclairage et son procédé de fonctionnement

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EP (1) EP2184956A3 (fr)
DE (1) DE102008056814A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016101352A1 (de) 2016-01-26 2017-07-27 Bag Electronics Gmbh Anordnung und Verfahren zum Betreiben eines Leuchtmittels

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0735801A1 (fr) * 1995-03-29 1996-10-02 Valeo Electronique Perfectionnements aux dispositifs d'alimentation de lampes à décharge de projecteurs de véhicules automobiles
US20020067145A1 (en) * 2000-06-19 2002-06-06 International Rectifier Corporation Ballast control IC with minimal internal and external components
DE102006061357A1 (de) * 2006-12-22 2008-06-26 Infineon Technologies Austria Ag Verfahren zur Ansteuerung einer Leuchtstofflampe
EP2124510A1 (fr) * 2008-05-16 2009-11-25 Infineon Technologies Austria AG Procédé de commande d'une lampe fluorescente et appareil de montage de lampes

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4039161C2 (de) * 1990-12-07 2001-05-31 Zumtobel Ag Dornbirn System zur Steuerung der Helligkeit und des Betriebsverhaltens von Leuchtstofflampen
US5969483A (en) * 1998-03-30 1999-10-19 Motorola Inverter control method for electronic ballasts
DE19928042A1 (de) * 1999-06-18 2000-12-21 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Verfahren zum Betreiben mindestens einer Leuchtstofflampe sowie elektronisches Vorschaltgerät dafür
US7098605B2 (en) * 2004-01-15 2006-08-29 Fairchild Semiconductor Corporation Full digital dimming ballast for a fluorescent lamp

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0735801A1 (fr) * 1995-03-29 1996-10-02 Valeo Electronique Perfectionnements aux dispositifs d'alimentation de lampes à décharge de projecteurs de véhicules automobiles
US20020067145A1 (en) * 2000-06-19 2002-06-06 International Rectifier Corporation Ballast control IC with minimal internal and external components
DE102006061357A1 (de) * 2006-12-22 2008-06-26 Infineon Technologies Austria Ag Verfahren zur Ansteuerung einer Leuchtstofflampe
EP2124510A1 (fr) * 2008-05-16 2009-11-25 Infineon Technologies Austria AG Procédé de commande d'une lampe fluorescente et appareil de montage de lampes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016101352A1 (de) 2016-01-26 2017-07-27 Bag Electronics Gmbh Anordnung und Verfahren zum Betreiben eines Leuchtmittels

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Publication number Publication date
EP2184956A3 (fr) 2011-09-21
DE102008056814A1 (de) 2010-05-27

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