EP1881745B1 - Vorrichtung und Verfahren zum Erkennen der Versorgungsleistung einer Entladungslampe - Google Patents

Vorrichtung und Verfahren zum Erkennen der Versorgungsleistung einer Entladungslampe Download PDF

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Publication number
EP1881745B1
EP1881745B1 EP20060425504 EP06425504A EP1881745B1 EP 1881745 B1 EP1881745 B1 EP 1881745B1 EP 20060425504 EP20060425504 EP 20060425504 EP 06425504 A EP06425504 A EP 06425504A EP 1881745 B1 EP1881745 B1 EP 1881745B1
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Prior art keywords
lamp
ton
conduction time
voltage
power
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Expired - Fee Related
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EP20060425504
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English (en)
French (fr)
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EP1881745A1 (de
Inventor
Sebastiano Messina
Natale Aiello
Danilo Antonio Claudio Morreale
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STMicroelectronics SRL
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STMicroelectronics SRL
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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
    • H05B41/36—Controlling

Definitions

  • the present invention relates to techniques that enable recognition of the power of discharge lamps and has been developed with particular attention paid to its possible use in electronic devices designed to supply such lamps.
  • Discharge lamps such as fluorescent lamps and high-intensity discharge lamps (HIDs) are among the most popular in view of their luminous efficiency, their good chromatic yield and their long life as compared to incandescent lamps.
  • lamps are not able to operate if connected directly to the power supply network.
  • said lamps require the use of intermediate devices, such as, for example, electronic power supplies, which are able to perform the following functions:
  • the devices for the power supplying of discharge lamps are divided into two types: electromagnetic and electronic.
  • the electronic devices offer, as compared to magnetic ones, the following advantages:
  • these devices are designed for driving one and the same type of lamp or at the most a set of lamps with a fixed and defined power.
  • the a.c. voltage 5, supplied by the supply network, is sent at input to the power supply device 100.
  • Said device comprises a rectifier block 10, and the voltage 15, at output from the aforesaid rectifier block 10, is sent to a power-factor correction (PFC) block 20, which performs re-phasing of the current absorbed by the load 40 and regulates the voltage at the output block 30 (high-frequency inverter).
  • the power-factor correction block 20 is controlled by a driving block 50, whilst the output block 30 is controlled by a driving block 55.
  • the load 40 is represented precisely by the discharge lamp.
  • the devices of Figures 2 and 3 are distinguished with respect to the basic architecture of Figure 1 in so far as they use a microcontroller 60 for controlling the driving blocks 50 and 55 of the power-factor correction stage 20 and of the output stage 30, respectively.
  • the diagram of Figure 3 highlights the possibility of merging the blocks 50 and 55 into a single block.
  • document US-B-6 501 235 illustrates a device for recognition of lamps based upon information obtained from the filaments of the lamps.
  • This device presents limits in recognizing lamps that are different but have similar characteristics in the filaments: the device can thus be adopted only for the recognition of lamps that have filaments with marked differences, given also the variability of these characteristics with temperature.
  • a process and a device for recognizing the type of the connected discharge lamp as set forth in the preamble of claims 1 and 4 are known in the art e.g. by US 2003/160578 A1 .
  • the object of the present invention is thus to provide a fully satisfactory response to those needs.
  • the present invention relates to devices for the power supplying of discharge lamps, which, thanks to the use of a microcontroller, are able to automatically recognize the lamp that is connected thereto, correctly establishing and setting the operating parameters for the aforesaid lamp.
  • Each lamp is characterized by different operating parameters that uniquely distinguish it from the other lamps. It is possible to correctly drive lamps of different types and powers with a single power-supply device by measuring the operating parameters of a lamp and sizing the output of the power-supply device on the basis of the values assumed by these parameters.
  • the calculation of the lamp power is not made, as generally occurs in the known art, by multiplying the lamp voltage by the lamp current.
  • Figure 4 refers specifically to the block 20.
  • the microcontroller is set in conditions of directly deriving the lamp power by reading the conduction time Ton of an electronic switch Q1 comprised in the power-factor correction block 20.
  • the block 20 comprises a network substantially resembling a low-pass filter LC comprising an inductor L and a capacitor C, with an interposed diode D.
  • the electronic switch Q1 by closing itself, short-circuits the point of connection between the inductor L and the diode D to ground.
  • the power-factor correction block 20 basically comprises a boost converter that works in transition mode at a variable frequency, with the conduction time of the electronic switch Q1 fixed and designated by Ton. Meanwhile the output block 30 transforms the d.c. voltage into high-frequency a.c. voltage and comprises two electronic switches in half-bridge configuration that work in zero-voltage switching mode.
  • the conduction time Ton in the operating mode of the power-factor correction block 20, i.e. in the transition mode, is constant and is directly proportional to the lamp power.
  • the power-factor correction block 20 is in fact controlled by the block 50 (in a way known per se) so as to maintain the voltage at output on the load 40, i.e. on the lamp, constant. For this purpose it adapts the conduction time Ton proportionally to the power absorbed, as emerges from the relation given below.
  • Ton 2 ⁇ L ⁇ P 0 V inrms 2
  • the time Ton is directly proportional to the power of the load 40, which in this case is represented by the lamp itself.
  • the advantage of using this solution consists in recognizing the lamp power without making measurements of voltage on the lamp and without resorting to complex multiplications on the microcontroller 60.
  • a.c. input voltage is recognized in order to be able to identify the factor V inrms in the preceding relation, and in a step 202 the power supply is initialized.
  • the microcontroller 60 carries out a check on the input voltage as soon as the power supply is supplied.
  • a step 204 it is verified whether the lamp has already been recognized previously or not.
  • an identification code is stored on the EEPROM of the microcontroller 60, said code enabling the microcontroller itself to set the correct parameters of the lamp each time the lamp 40 is turned back on.
  • the microcontroller 60 fixes the initial parameters (current/voltage and time for pre-heating of the cathodes, striking sequence, etc.), and makes a first selection on the type of lamp. This selection implies a measurement of resistance of the filaments in the lamps.
  • step 206 in which all the subsequent steps of power supply of the lamp are carried out with the values of the parameters already previously set.
  • step 208 in which the family to which the lamp to be supplied belongs is recognized.
  • the lamp is turned on, monitoring the voltage at striking. Once this datum is acquired, the microcontroller 60 recognizes the lamp that is connected and fixes a current therefor. In this way, the lamp will absorb a clearly determined power.
  • the reference number 210 designates the step in which the power-factor correction block 20 is activated, whilst in a step 212 the lamp is pre-heated (according to criteria known per se). In a subsequent step 214, the lamp is started, and in a step 216 the striking voltage of the lamp is monitored by the microcontroller 60, which is able to make a first detailed recognition of the lamp.
  • the microcontroller fixes the current of the lamp and the conduction time Ton for the power-factor correction block 20, setting them at the values corresponding to the recognized lamp.
  • a step 220 the microcontroller verifies whether the conduction time Ton measured on the switch Q1 is consistent with the conduction time Ton estimated for the type of recognized lamp.
  • the microcontroller 60 carries out a check on the conduction time of the switch Q1 of the block 20, verifying, in effect, the power absorbed by the load 40 (i.e. the lamp). This verification is necessary to confirm whether, with the current set, the lamp has been recognized correctly.
  • step 226 in which the operating parameters are confirmed.
  • the process proceeds with a step 222, in which a new recognition of the lamp is made in accordance with the value of the conduction time Ton actually measured.
  • the microcontroller fixes the new parameters associated to the recognized lamp. Also in this case, the process proceeds with a step 226, in which the operating parameters are confirmed.
  • the recognition of the lamp is then made by associating a reading of the striking voltage of the lamp, with a verification of the conduction time Ton of the switch Q1 in the block 20.
  • the microcontroller establishes the parameters for properly driving the lamp in all its operating conditions, adapting also all the protection thresholds.
  • the initial conditions will be the ones for the lamp previously recognized, but the microcontroller will always verify that the parameters set correspond to those of the actually connected lamp.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)

Claims (8)

  1. Verfahren zum Erkennen des Typs einer angeschlossenen Entladungslampe (40) auf der Basis der der Entladungslampe (40) zugeführten Energie, bei dem die Lampe (40) unter Ausführung einer Korrektur des Leistungsfaktors (20) mit Energie versorgt wird (30), wobei das Verfahren folgende Schritte aufweist:
    - Messen der Eingangsspannung (200),
    - Starten (214) der Lampe (40) und
    - Messen des Zündpotentials zum Ausführen (216) einer ersten Erkennung des Typs der Lampe (40) in Abhängigkeit von dem Zündpotential;
    dadurch gekennzeichnet,
    dass das Verfahren weiterhin folgende Schritte aufweist:
    - Schätzen (60) einer Leitungszeit (Ton) in Abhängigkeit von der Energiezufuhr, die der bei der ersten Erkennung erkannten Lampe (40) entspricht;
    - Messen (Q1) der Leitungszeit (Ton), die bei der Lampe (40) wirksam zur Anwendung kommt;
    - Vergleichen (220) der geschätzten (60) Leitungszeit (Ton) mit der gemessenen (Q1) Leitungszeit; und
    - Ausführen der Korrektur des Leistungsfaktors (20) auf der Basis des Vergleichs, wobei dann:
    - i) wenn die geschätzte (60) Leitungszeit (Ton) und die gemessene (Q1) Leitungszeit in etwa gleich sind, die Lampe (40) als der bei der ersten Erkennung erkannten Lampe (40) entsprechend erkannt wird (226);
    - ii) wenn die geschätzte (60) Leitungszeit (Ton) und die gemessene (Q1) Leitungszeit nicht in etwa gleich sind, die Lampe (40) als einer Lampe (40) entsprechend erkannt wird (226), die die gemessene Leitungszeit (Q1) aufweist.
  2. Verfahren nach Anspruch 1,
    dadurch gekennzeichnet, dass der Schritt des Schätzens (60) der Leitungszeit (Ton) die Anwendung der folgenden Beziehung beinhaltet: P 0 = Ton ⋅ V 2 inrms 2 ⋅ L
    Figure imgb0004
    dabei bedeuten:
    P0 die Energiezufuhr, die der ersten Erkennung entspricht;
    Ton die Leitungszeit;
    L ein Induktivitätswert, der der Korrektur (20) des Leistungsfaktors zugeordnet ist; und
    Vinrms der Effektivwert der Wechselspannung bei Einspeisung für die Korrektur (20) des Leistungsfaktors.
  3. Verfahren nach Anspruch 1 oder 2,
    dadurch gekennzeichnet, dass es ferner den Schritt des Regulierens von mindestens einem der nachfolgenden Parameter der Lampe (40) beinhaltet:
    - den Strom und/oder die Spannung zum Vorerwärmen der Kathoden;
    - die Zeit zum Vorerwärmen der Kathoden;
    - die Zündspannung; und
    - den Strom und/oder die Spannung der Lampe im eingeschwungenen Zustand.
  4. Vorrichtung zum Erkennen des Typs einer angeschlossenen Entladungslampe (40) auf der Basis der der Entladungslampe (40) zugeführten Energie, wobei die Vorrichtung Folgendes aufweist:
    - einen Ausgangsblock für die die Lampe (40) speisende Energie;
    - einen Leistungsfaktor-Korrekturblock (20) zum Korrigieren des Leistungsfaktors;
    - eine Steuerschaltung (60) zum Messen der Eingangsspannung (200), wobei die Steuerschaltung (60) auf die Versorgungsspannung der Lampe (40) anspricht, um beim Starten der Lampe (40) die Zündspannung zu erfassen und eine erste Erkennung des Typs der Lampe (40) in Abhängigkeit von der Zündspannung vorzunehmen (216),
    dadurch gekennzeichnet, dass die Steuerschaltung (60) konfiguriert ist zum:
    - Schätzen der Leitungszeit (Ton) in Abhängigkeit von der Energiezufuhr, die der bei der ersten Erkennung erkannten Lampe (40) entspricht;
    - Messen (Q1) der Leitungszeit (Ton), die bei der Lampe (40) wirksam zur Anwendung kommt, und
    - Vergleichen (220) der geschätzten (60) Leitungszeit (Ton) mit der gemessenen (Q1) Leitungszeit, und
    - Ausführen der Korrektur des Leistungsfaktors (20) auf der Basis des Vergleichs, wobei dann:
    - i) wenn die geschätzte (60) Leitungszeit (Ton) und die gemessene (Q1) Leitungszeit in etwa gleich sind, die Steuerschaltung (60) die Lampe (40) als der bei der ersten Erkennung erkannten Lampe (40) entsprechend erkennt (226);
    - ii) wenn die geschätzte (60) Leitungszeit (Ton) und die gemessene (Q1) Leitungszeit nicht in etwa gleich sind, die Steuerschaltung (60) die Lampe (40) als einer Lampe (40) entsprechend erkennt (226), die die gemessene Leitungszeit (Q1) aufweist.
  5. Vorrichtung nach Anspruch 4,
    dadurch gekennzeichnet, dass die Steuerschaltung (60) dafür konfiguriert ist, die Leitungszeit (Ton) anhand der folgenden Beziehung zu schätzen: P 0 = Ton ⋅ V 2 inrms 2 ⋅ L
    Figure imgb0005
    dabei bedeuten:
    Po die Energiezufuhr, die der ersten Erkennung entspricht;
    Ton die Leitungszeit;
    L ein Induktivitätswert, der der Korrektur (20) des Leistungsfaktors zugeordnet ist; und
    Vinrms der Effektivwert der Wechselspannung bei Einspeisung für die Korrektur (20) des Leistungsfaktors.
  6. Vorrichtung nach Anspruch 4 oder 5,
    dadurch gekennzeichnet, dass die Steuerschaltung (60) dafür konfiguriert ist, mindestens einen der nachfolgenden Parameter der Lampe (40) zu regulieren:
    - den Strom und/oder die Spannung zum Vorerwärmen der Kathoden;
    - die Zeit zum Vorerwärmen der Kathoden;
    - die Zündspannung; und
    - den Strom und/oder die Spannung der Lampe im eingeschwungenen Zustand.
  7. Vorrichtung nach Anspruch 6,
    dadurch gekennzeichnet, dass es sich bei der Steuerschaltung um einen Mikrocontroller (60) handelt.
  8. Vorrichtung nach einem der Ansprüche 4 bis 7,
    dadurch gekennzeichnet, dass der Korrekturblock (20) zum Korrigieren des Leistungsfaktors einen Aufwärtswandler aufweist, der im Übergangsmodus mit einer variablen Frequenz arbeitet.
EP20060425504 2006-07-20 2006-07-20 Vorrichtung und Verfahren zum Erkennen der Versorgungsleistung einer Entladungslampe Expired - Fee Related EP1881745B1 (de)

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EP20060425504 EP1881745B1 (de) 2006-07-20 2006-07-20 Vorrichtung und Verfahren zum Erkennen der Versorgungsleistung einer Entladungslampe
DE200660013616 DE602006013616D1 (de) 2006-07-20 2006-07-20 Vorrichtung und Verfahren zum Erkennen der Versorgungsleistung einer Entladungslampe

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EP20060425504 EP1881745B1 (de) 2006-07-20 2006-07-20 Vorrichtung und Verfahren zum Erkennen der Versorgungsleistung einer Entladungslampe

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EP1881745B1 true EP1881745B1 (de) 2010-04-14

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008027029A1 (de) 2008-06-06 2009-12-10 Tridonicatco Gmbh & Co. Kg Lampentyperkennung durch Leistungsfaktorkorrekturschaltung
DE102008047440A1 (de) * 2008-09-16 2010-03-25 Tridonicatco Gmbh & Co. Kg Bestimmung des Typs eines Leuchtmittels oder der Topologie mehrerer Leuchtmittel
CN103120028A (zh) * 2010-09-28 2013-05-22 皇家飞利浦电子股份有限公司 用于自动地检测安装的灯类型的装置和方法
DE102012014308A1 (de) 2012-04-13 2013-10-17 Tridonic Gmbh & Co. Kg Betriebsgerät für ein Leuchtmittel und Verfahren zum Betreiben eines Betriebsgeräts

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Publication number Priority date Publication date Assignee Title
JPH0766864B2 (ja) * 1989-07-28 1995-07-19 東芝ライテック株式会社 放電灯点灯装置
US6501235B2 (en) 2001-02-27 2002-12-31 Stmicroelectronics Inc. Microcontrolled ballast compatible with different types of gas discharge lamps and associated methods
JP3741035B2 (ja) * 2001-11-29 2006-02-01 サンケン電気株式会社 スイッチング電源装置
JP2003249392A (ja) 2002-02-22 2003-09-05 Mitsubishi Electric Corp 放電灯点灯装置
EP1580639B1 (de) * 2004-03-22 2008-05-14 STMicroelectronics S.r.l. Übergangsmodus-Leistungsfaktorkorrekturvorrichtung in Schaltnetzteilen

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