EP1784062A1 - Ballast électronique et procédure de réglage - Google Patents

Ballast électronique et procédure de réglage Download PDF

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Publication number
EP1784062A1
EP1784062A1 EP06008967A EP06008967A EP1784062A1 EP 1784062 A1 EP1784062 A1 EP 1784062A1 EP 06008967 A EP06008967 A EP 06008967A EP 06008967 A EP06008967 A EP 06008967A EP 1784062 A1 EP1784062 A1 EP 1784062A1
Authority
EP
European Patent Office
Prior art keywords
duty cycle
inverter
fluorescent lamp
lamp
voltage divider
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Withdrawn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
EP06008967A
Other languages
German (de)
English (en)
Inventor
Jürgen Klier
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
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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 Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Publication of EP1784062A1 publication Critical patent/EP1784062A1/fr
Withdrawn legal-status Critical Current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
    • H05B41/282—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
    • H05B41/285—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2858—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the lamp against abnormal operating 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
    • H05B41/288—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 without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
    • H05B41/292—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2928—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the lamp against abnormal operating conditions

Definitions

  • the present invention relates to an electric ballast for operating and / or dimming a fluorescent lamp with an inverter and a parallel to the input of the inverter voltage divider, wherein between the tap of the voltage divider and the output of the inverter, the fluorescent lamp is switchable. Moreover, the present invention relates to a corresponding method for adjusting an electronic ballast for the supply of a fluorescent lamp with the AC of an inverter and the DC generated by means of a voltage divider.
  • a related circuit is in the patent US 5 034 660 shown.
  • the DC current needed to compensate for disc discharges is usually generated by a voltage divider and flows through the lamp and the lamp inductor into the half-bridge of the inverter.
  • a voltage divider Such a circuit is from the document EP 0 422 255 A1 known. It has been shown that larger diameter (T8) fluorescent lamps require significantly more DC power to eliminate disc discharges than smaller diameter lamps (T4, T5). On the other hand, it has also been found that too much DC affects the stability in the lower dimming range (by 1% of the nominal luminous flux), especially for the thin lamps. That's why in particular ECGs (electronic ballasts) with lamp detection can adjust the DC current to the diameter of the currently operated lamp.
  • DC voltage which is applied to the lamp during preheating of the lamp - that is, as long as the lamp does not burn. This DC voltage can cause the prescribed limits for the RMS value and the crest factor of the open circuit or open circuit voltage across the lamp during preheating to be exceeded.
  • the object of the present invention is therefore to propose an electronic ballast with which fluorescent lamps of different diameters can be better operated.
  • a corresponding method for setting an electronic ballast is to be provided.
  • this object is achieved by an electronic ballast for operating and / or dimming a fluorescent lamp with an inverter and a parallel to the input of the inverter voltage divider, wherein between the tap of the voltage divider and the output of the inverter, the fluorescent lamp is switchable, and wherein the duty cycle of the inverter is variable, so that a DC current through the fluorescent lamp with the duty cycle can be set to a desired value.
  • a method of adjusting an electronic ballast for supplying a fluorescent lamp with the AC of a half-bridge inverter and a DC current generated by means of a voltage divider by adjusting a duty ratio of the Inverter such that the direct current through the fluorescent lamp reaches a desired value is provided.
  • the direct current which is necessary for the operation of the fluorescent lamp can advantageously be varied almost as desired without great effort, without components having to be exchanged.
  • disk discharges in lamps of larger diameter and flicker phenomena in lamps of smaller diameter can be virtually completely prevented.
  • the inverter of the electronic ballast has a microcontroller with which the duty cycle is adjustable.
  • the duty cycle can be adjusted by software.
  • the duty cycle should be able to be varied within a range of 30% / 70% to 70% / 30%. Duty ratios outside this range make the dimensioning of the load circuit more difficult.
  • the voltage divider is dimensioned so that at a duty cycle of 50% / 50%, half of the DC current required for the fluorescent lamp to be used flows through the fluorescent lamp.
  • the duty cycle compared to the ratio 50% / 50% is not too much detuned.
  • a fluorescent lamp L is supplied with direct current via a voltage divider R1 / R2, which divides a DC link voltage Uzw in the corresponding ratio and provides this divided voltage at its tap. At the tap a pole of the fluorescent lamp L is connected.
  • a capacitor CK is also closed to ground.
  • the DC link voltage Uzw also serves as an input voltage for an inverter, which is realized here by a half-bridge consisting of a series connection of two transistors Q1 and Q2.
  • the transistors Q 1 and Q 2 are controlled by a microcontroller ⁇ C in a desired duty cycle.
  • a lamp inductor LD is connected at the node between the transistors Q1 and Q2 . On the other hand, this is connected to the second pole of the fluorescent lamp and a capacitor CZ, which is also grounded.
  • the DC current generated by the voltage divider R1 / R2 flows through the fluorescent lamp L and the lamp inductor LD in the half-bridge Q1 / Q2.
  • the divider ratio and the internal resistance of the voltage divider R1 / R2 determine the size of the direct current and its course over the dimming range.
  • the duty cycle of the half-bridge Q1 / Q2 is usually 50% / 50%, so that at the node between the transistors Q1 and Q2 in the time average half the DC link voltage Uzw / 2 is applied.
  • the DC current is also adjusted by changing the DC component of the half-bridge voltage at the node between the transistors Q1 and Q2 via the duty cycle of the half-bridge control.
  • This duty cycle can be easily adjusted via the software in the case of an ECG with lamp detection, in which a microcontroller ⁇ C controls the half-bridge Q1 / Q2.
  • the hardware of the circuit does not change.
  • the resistors R1 and R2 are dimensioned differently than in the case of a rigid duty cycle.
  • a circuit with a fixed duty cycle of 50% / 50% is chosen as the starting point.
  • R1 150 k ⁇
  • R2 820 k ⁇
  • Uzw 400 V
  • a maximum direct current of 789 ⁇ A and an empty voltage of 138 V result for the selected duty cycle.
  • the DC current is adjusted by the divider ratio and / or the duty cycle.
  • Example 1 shows the extreme case that the direct current is set solely via the duty cycle.
  • the selected lamp requires a maximum direct current of 789 ⁇ A and thus the mentioned duty cycle of 15.5% / 84.5%, which corresponds to a very strong detuning.
  • This strong detuning complicates the dimensioning of the load circuit LD, CZ and CK, since the load circuit must be completely recirculated each time a transistor Q1, Q2 is switched on in order to avoid switching losses and radio interference.
  • the following example 2 shows a more favorable dimensioning.
  • the resistors R1 and R2 are chosen so that at a duty cycle 50% / 50%, only half of the DC current required for the lamp flows through the lamp. The other half of the DC current is generated by a detuning of the duty cycle.
  • the duty cycle is reversed (67.3% / 32.7%)
  • the DC and the empty voltage disappear.
  • Intermediate values of the direct current can be set as desired via the pulse duty factor.
  • a dimmable electronic ballast with variable DC component of the lamp current can be realized without further ado.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
EP06008967A 2005-05-10 2006-04-28 Ballast électronique et procédure de réglage Withdrawn EP1784062A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510021595 DE102005021595A1 (de) 2005-05-10 2005-05-10 Elekronisches Vorschaltgerät und entsprechendes Einstellverfahren

Publications (1)

Publication Number Publication Date
EP1784062A1 true EP1784062A1 (fr) 2007-05-09

Family

ID=37295267

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06008967A Withdrawn EP1784062A1 (fr) 2005-05-10 2006-04-28 Ballast électronique et procédure de réglage

Country Status (3)

Country Link
EP (1) EP1784062A1 (fr)
CN (1) CN1867221B (fr)
DE (1) DE102005021595A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0155729A1 (fr) * 1984-03-08 1985-09-25 Philips Patentverwaltung GmbH Circuit pour l'exploitation à courant alternatif pour lampes à décharge à haute pression
EP0422255A1 (fr) * 1989-10-09 1991-04-17 Siemens Aktiengesellschaft Ballast électronique
US5034660A (en) * 1982-04-21 1991-07-23 Oy Helvar Method of and apparatus for supplying high frequency alternating current to a fluorescence lamp
EP0547674A1 (fr) * 1991-12-16 1993-06-23 Koninklijke Philips Electronics N.V. Dispositif de communitation pour éliminer les striations
US5701059A (en) * 1995-12-26 1997-12-23 General Electric Company Elimination of striations in fluorescent lamps driven by high-frequency ballasts
US5729095A (en) * 1994-09-28 1998-03-17 Toshiba Lighting & Technology Corporation High frequency lighting apparatus having an intermediate potential applied to the trigger electrode to reduce leakage current
DE19736894A1 (de) * 1996-10-21 1998-04-30 Int Rectifier Corp Integrierte Treiberschaltung
WO2004049768A1 (fr) * 2002-11-27 2004-06-10 Koninklijke Philips Electronics N.V. Circuit de correction de stries a suppression symetrique

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19922039A1 (de) * 1999-05-12 2000-11-16 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Vorschaltgerät für mindestens eine Gasentladungslampe und Verfahren zum Betreiben eines derartigen Vorschaltgeräts

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5034660A (en) * 1982-04-21 1991-07-23 Oy Helvar Method of and apparatus for supplying high frequency alternating current to a fluorescence lamp
EP0155729A1 (fr) * 1984-03-08 1985-09-25 Philips Patentverwaltung GmbH Circuit pour l'exploitation à courant alternatif pour lampes à décharge à haute pression
EP0422255A1 (fr) * 1989-10-09 1991-04-17 Siemens Aktiengesellschaft Ballast électronique
EP0547674A1 (fr) * 1991-12-16 1993-06-23 Koninklijke Philips Electronics N.V. Dispositif de communitation pour éliminer les striations
US5729095A (en) * 1994-09-28 1998-03-17 Toshiba Lighting & Technology Corporation High frequency lighting apparatus having an intermediate potential applied to the trigger electrode to reduce leakage current
US5701059A (en) * 1995-12-26 1997-12-23 General Electric Company Elimination of striations in fluorescent lamps driven by high-frequency ballasts
DE19736894A1 (de) * 1996-10-21 1998-04-30 Int Rectifier Corp Integrierte Treiberschaltung
WO2004049768A1 (fr) * 2002-11-27 2004-06-10 Koninklijke Philips Electronics N.V. Circuit de correction de stries a suppression symetrique

Also Published As

Publication number Publication date
CN1867221A (zh) 2006-11-22
CN1867221B (zh) 2012-03-21
DE102005021595A1 (de) 2006-11-16

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