EP2484184A1 - Agencement de circuits et procédé de fonctionnement d'au moins une lampe à décharge - Google Patents

Agencement de circuits et procédé de fonctionnement d'au moins une lampe à décharge

Info

Publication number
EP2484184A1
EP2484184A1 EP10784291A EP10784291A EP2484184A1 EP 2484184 A1 EP2484184 A1 EP 2484184A1 EP 10784291 A EP10784291 A EP 10784291A EP 10784291 A EP10784291 A EP 10784291A EP 2484184 A1 EP2484184 A1 EP 2484184A1
Authority
EP
European Patent Office
Prior art keywords
coupled
circuit arrangement
electronic switch
circuit
current
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Withdrawn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
EP10784291A
Other languages
German (de)
English (en)
Inventor
Markus Heckmann
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
Original Assignee
Osram 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 Osram GmbH filed Critical Osram GmbH
Publication of EP2484184A1 publication Critical patent/EP2484184A1/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Withdrawn legal-status Critical Current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
    • H05B41/26—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

Definitions

  • the present invention relates to a circuit arrangement for operating at least a discharge lamp with an input having a first and a second single input terminal for coupling to a DC supply voltage, an output having a first and a second output terminal for coupling to the at least ei ⁇ NEN discharge lamp, a bridge circuit having at least a first and a second electronic switch, a series circuit of the first and the second electronic switch to form a first bridge center point between the first and the two ⁇ th e i ngang s terminal coupled is an LRC resonant load circuit at least second order with a lamp inductor, which is coupled between the first bridge center and the first output terminal, and min ⁇ least one, parallel to one of the electronic switch coupled trapezoidal capacitor, and a control device for controlling at least he and the second electronic switch with a An horrsig- signal, the Ans has teuersignal an operating frequency for operating the LRC resonant load circuit in the frequency range with inductive phase position. It also relates to a corresponding method for
  • Half-bridge or bridge circuits are commonly used as drivers of such load circuits.
  • the switch of the bridge circuit In order to ensure a soft switching, a so-called soft switching, the switch of the bridge circuit, that is, a lossless switching, it is necessary to provide a certain amount of reactive power. With an appropriate design of the circuit overload conditions, component tolerances, fluctuations in the DC supply voltage and the lamp temperature and, moreover, the modification of various parameters due to the lamp aging must be considered. This leads to ⁇ that in normal operation, that is, in operation far away from the worst case, usually large amounts of Blindleis ⁇ tion are available. The transmission of these large amounts of reactive power causes unwanted losses. If not enough reactive power ⁇ is present in the circuit arrangement, the switches of the bridge circuit switch hard, so-called hard switching, thereby causing undesirable high current peaks, losses and elekt ⁇ romagnetician disorders. An operation near the resonance frequency of the LRC load circuit is desirable over ⁇ this, since then a maximum of energy can be transmitted to the LRC load circuit. Presentation of the invention
  • the object of the present invention is therefore to gozu ⁇ form a generic circuit arrangement or a generic method such that a soft switching with as little reactive power to be transmitted and largely independent of various boundary conditions, such as lamp temperature, lamp aging, component tolerances, is possible.
  • the present invention is based on the finding that during commutation of the current from a first to a second electronic switch of the bridge circuit, first a current flows through the freewheeling diode of the switch to be turned on, before this switch itself is turned on. The period during which both switches are switched off is called dead time. The second switch is turned on in the period during which current flows through its freewheeling diode to ensure smooth switching. This period is greater the more reactive power is present in the load circuit. Part of the reactive power is used to reload the trapezoidal capacitor. The further excess of reactive power is fed back into the supply via the freewheeling diodes.
  • the present invention is based in particular on the invention. know that a hard switching by a peak in the current through the conductive switch is recognizable. This indicates that the operating frequency of the drive signal for the switches of the half-bridge is too close to the resonance frequency, that is, tends to sink from the inductive range into the capacitive range.
  • the present invention therefore includes a Determined ⁇ averaging device, which is designed, the temporal derivation of the stream to determine at least one of the electronic switch by. It further comprises a comparator, coupled to the determining device and configured to compare the value of the time from ⁇ line of the current through at least one of the electronic switch to see a predeterminable threshold value. If exceeding this predetermined threshold determined, which effetsvorrich ⁇ tung the control device in such a way that this increases the operating frequency of the drive signal ⁇ Be. As a result, the load circuit is operated again in the inductive range, whereby the mentioned peaks and thus a hard switching of the switches is avoided. By doing so, operation of the circuitry close to the resonant frequency but on the inductive side thereof is possible.
  • the Siemensungsanord ⁇ tion can be operated with minimal reactive power.
  • the power components such as coils, capacitors, switches and so on, can be made smaller.
  • simpler circuit concepts can be realized, for example the integration of preheating into the lamp inductor.
  • the control device is designed to increase the operating frequency. This can be done by fine dimensioning predefinable steps in digital implementation or by stepless control in an analog implementation. In order for an operation of the circuit arrangement is made possible close to the optimum, that is, in view of the present Prob ⁇ lematics with minimal reactive power, yet a soft switching can be guaranteed.
  • control device is designed to reduce the operating frequency on the basis of a predefinable initial value, in particular in predefinable steps or steplessly, as long as no exceeding of the predefinable threshold value is determined by the value of the time derivative of the current through at least one of the electronic switches ,
  • This measure serves to gradually lower the operating frequency starting from a value at which certainly exists sufficiently reactive ⁇ power in the load circuit to achieve the optimization mums in critical areas.
  • a fine dimensioning of vorgebba ⁇ ren steps allows reliable finding of the optimum, regardless of the above-mentioned varying operating parameters.
  • the detection device comprises a shunt resistor coupled serially to the first or second electronic switch.
  • the determination device further preferably comprises a differential discriminating device which is designed to ermit ⁇ the time derivative of the current through the shunt resistor.
  • the determining device comprises an inductance which is coupled in series to the first or second electronic switch.
  • the comparison device comprises a voltage divider, which is connected in parallel at least the inductance, wherein the Ab ⁇ grip point of the voltage divider is coupled to the control electrode of a controllable resistor.
  • the voltage divider may comprise a diode further, the diode between the inductance gekop ⁇ -coupled terminal of the voltage divider and the tap ⁇ point of the voltage divider is coupled.
  • This measure can take account of the fact that ne control tasks of the control device, the determination of the current through one of the electronic switches is needed, that is not its time derivative. If now for this purpose, a shunt resistor coupled in series with the inductance, in particular such that the coupled in ⁇ productivity between the second electronic switch and the shunt resistor, the voltage drop across the shunt resistor can be taken into account when maximum current through the diode and therefore does not disturb the evaluation of the time derivative of this current by a comparison device designed as mentioned.
  • a device for averaging is coupled between the working electrode of the controllable resistor and the control device.
  • pulses at the input of the controllable resistor are not transmitted to its output, which is coupled to the control device.
  • FIG. 2 is a more detailed view of a portion of the guide shown in FIG. 1; FIG. and
  • 3a to 3c show the time profile of the current through the second electronic switch of the embodiment shown in FIG. 1 different operating frequencies
  • Fig. 1 shows a schematic representation of an embodiment of an inventive Heidelbergungsanord ⁇ tion.
  • the circuit arrangement comprises an input with a first El and a second input terminal E2, between which a DC supply voltage is applied, in particular the so-called intermediate circuit voltage U Zw .
  • a Brü ⁇ bridge circuit is coupled, which mainly comprises a first switch Sl and a second switch S2.
  • the actual switch is connected in antiparallel in each case one freewheeling diode Dl or D2, where vorlie ⁇ quietly is expressed by the dashed outline that in a MOSFET the respective freewheel diode ⁇ is realized by the respective body diode.
  • LRC resonant circuits are possible.
  • the number and position of the trapezoidal capacitor (s), coupling capacitor (s), and resonant capacitor (s) may be varied without affecting the present invention.
  • a Shun t resistor Rl is provided which is serially coupled to the switch S2. Tand between the switch S2 and the shunt resis Rl is an inductance L2 gekop ⁇ pelt.
  • the drop across the inductance L2 voltage U L 2 is proportional to the time derivative of the current I S 2 through the inductance L2.
  • the voltage U L 2 is just ⁇ as the voltage U R i, which drops across the shunt resistor Rl, a processing device 12 which is designed, at its output AL a drive signal for the switch S2 and at its output AH To provide drive signal for the switch Sl.
  • the Anêtsig- signals have an operating frequency f, which can be varied.
  • a comparison device is provided, the voltage U L 2 is supplied. It is designed to compare the voltage U L 2 against a predefinable threshold, causing the processing device 12 to determine the operating frequency f of the control signals for the scarf ⁇ ter Sl, S2 upon detection of exceeding the predetermined threshold value.
  • FIG. 2 shows a more detailed representation of an embodiment of the embodiment of a circuit arrangement according to the invention shown in FIG. 1.
  • NEN is how to recognize, the voltage drop across the inductor L2 voltage U L 2 is supplied to a voltage divider D3 summarizes the resistors R2 and R3 and a diode to ⁇ . Its tapping point is coupled to the control electrode ei ⁇ nes transistor S3, which is operated here as a controllable resistor.
  • Parallel to the path working ⁇ electrode reference electrode of the transistor S3 is a Kon ⁇ capacitor Cl coupled, which represents a device for averaging together with an ohmic resistor R4.
  • the processing device 12 further comprises a control device 10.
  • the ohmic resistance R4 is coupled to an input of the control device 10.
  • the potential at the half-bridge center HBM drops to nearly 0 V. Since the potential at point N due to the charged capacitor C R is greater than 0 V, then a current flows from the discharge lamp La via the point N, the lamp inductor LI through the switch S2. To as much power to the discharge lamp to carry ⁇ , the operating frequency f of the driving signals for the switches Sl, S2 is as far as possible lowered in the direction of the resonant frequency of the LRC load circuit. As a result, there is little excess reactive energy in the load circuit, resulting in only minor losses.
  • FIG. 3a firstly shows the time profile of the current I S 2 through the switch S 2 and of the current I D 2 through the diode D 2 when the operating frequency f is dimensioned greater than the resonant frequency f 0 of the diode load circuit. It can be seen that a current I D2 flows through the diode D2 over a period of time ti, that is to say the long period of time ti is available for the Leitendschalt the switch S2.
  • the operating frequency of the switches S 1, S 2 is changed in such a way that it continues to be in the inductive range, ie is increased. This more inductive reactive power in the load circuit for Availability checked ⁇ supply is provided so that a reliable reoscillation and soft switching can be ensured.
  • a device was used for the drive device 12, which is designed so that it increases the operating frequency of the drive signals at its outputs AH and AL, the more current from the terminal to which the ohmic resistor R4 is connected via the ohmic resistor R4 flows through the transistor S3.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

<span lang=FR style='font-family:"Courier New"'>La présente invention concerne un agencement de circuits destiné à faire fonctionner au moins une lampe à décharge (La), avec une entrée comprenant un premier (E1) et un deuxième raccordement d'entrée (E2) destinés à coupler une tension continue d'alimentation (UZw) ; une sortie comprenant un premier (A1) et un deuxième raccordement de sortie (A2) pour le couplage de ladite au moins une lampe à décharge (La) ; un circuit en pont avec au moins un premier (S1) et un deuxième commutateur électronique (S2), un circuit en série composé du premier (S1) et du deuxième commutateur électronique (S2) formant un premier point central de pont (HBM) entre le premier (E1) et le deuxième raccordement d'entrée (E2) ; un circuit de charge résonant LRC de deuxième ordre au moins avec une bobine de lampe (L1) qui est couplée entre le premier point central de pont (HBM) et le premier raccordement de sortie (A1) ; et au moins un condensateur trapézoïdal (C</span>τ) monté en parallèle avec l'un des commutateurs électroniques (S1, S2) ; et un dispositif de commande (10) destiné à piloter au moins le premier (S1) et le deuxième commutateur électronique (S2) avec un signal de pilotage (AH, AL), le signal de pilotage (AH, AL) possédant une fréquence de fonctionnement (f) destiné à faire fonctionner le circuit de charge résonant LRC dans une plage de fréquences avec un déphasage inductif. L'agencement de circuits comprend en outre : un dispositif de détermination (L2) conçu pour déterminer l'allure dans le temps du courant (IS2) dans au moins l'un des commutateurs électroniques (S1, S2) ; et un dispositif de comparaison (R2, D3, R3, S3, C1, R4) couplé au dispositif de détermination (L2) et conçu pour comparer la valeur de l'allure dans le temps du courant (IS2) dans au moins l'un des commutateurs électroniques (S1, S2) avec une valeur de seuil prédéterminée. Le dispositif de comparaison (R2, D3, R3, S3, C1, R4) est en outre conçu pour, en cas de constatation d'un dépassement de la valeur de seuil prédéterminée, piloter le dispositif de commande (10) de telle manière que la fréquence de fonctionnement (f) du signal de pilotage (AH, AL) augmente. L'invention concerne en outre un procédé correspondant de fonctionnement d'au moins une lampe à décharge (La) sur un tel agencement de circuits.
EP10784291A 2009-12-09 2010-11-22 Agencement de circuits et procédé de fonctionnement d'au moins une lampe à décharge Withdrawn EP2484184A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200910047714 DE102009047714A1 (de) 2009-12-09 2009-12-09 Schaltungsanordnung und Verfahren zum Betreiben mindestens einer Entladungslampe
PCT/EP2010/067900 WO2011069813A1 (fr) 2009-12-09 2010-11-22 Agencement de circuits et procédé de fonctionnement d'au moins une lampe à décharge

Publications (1)

Publication Number Publication Date
EP2484184A1 true EP2484184A1 (fr) 2012-08-08

Family

ID=43532766

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10784291A Withdrawn EP2484184A1 (fr) 2009-12-09 2010-11-22 Agencement de circuits et procédé de fonctionnement d'au moins une lampe à décharge

Country Status (5)

Country Link
EP (1) EP2484184A1 (fr)
CN (1) CN203072233U (fr)
AU (1) AU2010330179A1 (fr)
DE (1) DE102009047714A1 (fr)
WO (1) WO2011069813A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011084274A1 (de) 2011-10-11 2013-04-11 Bag Engineering Gmbh Verfahren und Vorrichtung zur Überwachung von Stromspitzen in einem EVG
CN103517535A (zh) * 2013-09-13 2014-01-15 东南大学 一种金卤灯驱动电路

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE298496T1 (de) * 2000-04-10 2005-07-15 Koninkl Philips Electronics Nv Leistungswandler mit einer steuerschaltung
US7436127B2 (en) * 2005-11-03 2008-10-14 International Rectifier Corporation Ballast control circuit
US9112415B2 (en) * 2007-09-18 2015-08-18 Nxp B.V. Control of a half resonant converter for avoiding capacitive mode
DE102007044483B4 (de) * 2007-09-18 2019-11-14 Infineon Technologies Austria Ag Schutzschaltung zum Schutz einer Halbbrückenschaltung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2011069813A1 *

Also Published As

Publication number Publication date
DE102009047714A1 (de) 2011-06-16
WO2011069813A1 (fr) 2011-06-16
CN203072233U (zh) 2013-07-17
AU2010330179A1 (en) 2012-06-21

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