EP1715729A1 - Ballast électronique pour une lampe - Google Patents

Ballast électronique pour une lampe Download PDF

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Publication number
EP1715729A1
EP1715729A1 EP06007435A EP06007435A EP1715729A1 EP 1715729 A1 EP1715729 A1 EP 1715729A1 EP 06007435 A EP06007435 A EP 06007435A EP 06007435 A EP06007435 A EP 06007435A EP 1715729 A1 EP1715729 A1 EP 1715729A1
Authority
EP
European Patent Office
Prior art keywords
evaluation unit
signal evaluation
signal
voltage
control unit
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
EP06007435A
Other languages
German (de)
English (en)
Other versions
EP1715729B1 (fr
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
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 EP1715729A1 publication Critical patent/EP1715729A1/fr
Application granted granted Critical
Publication of EP1715729B1 publication Critical patent/EP1715729B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H05B41/2851—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
    • H05B41/2855—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against abnormal lamp 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S315/00—Electric lamp and discharge devices: systems
    • Y10S315/05—Starting and operating circuit for fluorescent lamp

Definitions

  • the present invention relates to an electronic ballast for a lamp, in particular an electronic ballast having a bridge circuit comprising at least a first and a second switch, which are coupled between a terminal for a supply voltage and a terminal for a ground potential, wherein between the first and second the second switch is defined a center point of the bridge circuit, a first and a second terminal for a lamp, wherein the first terminal is coupled via an inductance to the center of the bridge circuit, and a signal evaluation unit, wherein the signal evaluation unit comprises a first and a second input, wherein the first input is coupled to a signal that is at the DC level of the first terminal for the lamp, and wherein the second input is coupled to a signal that is at the gate voltage level of the second terminal for the lamp pe is.
  • Such an electronic ballast for a lamp is known.
  • a signal evaluation unit which is connected to the ground potential as a reference potential
  • the difference between the DC voltage level of the first terminal for the lamp and the second terminal for the lamp is determined and evaluated to make statements about the remaining life of the lamp.
  • the control of the bridge circuit is switched off in order to avoid damage in the electronic ballast.
  • the DC voltage useful signal is a DC voltage equal to the DC potential of the center of the bridge circuit superimposed.
  • the object of the present invention is to further develop the aforementioned electronic ballast in such a way that a more reliable EoL detection is possible.
  • the present invention is based on the finding that a less error-prone evaluation of the DC useful signal in the EoL detection can be achieved if, in the evaluation, the DC reference potential for the signal evaluation unit does not represent the ground potential, but a potential that is variably executed in a range of values, whose limits are defined by the ground potential and the supply voltage potential.
  • the DC reference potential for the signal evaluation unit does not represent the ground potential, but a potential that is variably executed in a range of values, whose limits are defined by the ground potential and the supply voltage potential. The smaller the DC voltage component which is superimposed on the DC useful signal, the lower the error in the measurement result.
  • a particularly advantageous embodiment is therefore characterized in that the DC voltage reference potential for the signal evaluation unit is essentially the potential of the center point of the half-bridge circuit.
  • the DC useful signal is not superposed by any disturbing DC voltage. The measurement error due to component tolerances is therefore minimal, the reliability of the result maximum.
  • a preferred embodiment further comprises a control unit for controlling the first and the second switch, wherein the control unit has a shutdown or Abregeleingang which is coupled to the signal evaluation unit, wherein the control unit and the signal evaluation unit are designed to cooperate such that at a difference of DC voltage component of the signals at the two inputs the signal evaluation unit, the signal evaluation unit controls the control unit via the shutdown or Abregeleingang such that no control of the first and / or the second switch is made or the first (S1) and / or the second switch (S2) are controlled in such a way in that the output power of the electronic ballast is reduced.
  • the control unit has a shutdown or Abregeleingang which is coupled to the signal evaluation unit, wherein the control unit and the signal evaluation unit are designed to cooperate such that at a difference of DC voltage component of the signals at the two inputs the signal evaluation unit, the signal evaluation unit controls the control unit via the shutdown or Abregeleingang such that no control of the first and / or the second switch is made or the first (S1) and / or the second
  • control unit has a supply voltage connection and is connected to the ground potential as a DC voltage reference potential.
  • the signal evaluation unit comprises a latch and is designed to activate the latch when the difference in the DC component of the signals at the two inputs of the signal evaluation unit is above a predetermined limit, wherein the output of the latch on the series circuit of a diode and a resistor to the Supply voltage terminal of the control unit and / or the signal evaluation unit is coupled.
  • the signal evaluation unit is realized as an active circuit, wherein the supply voltage of the control unit and / or the signal evaluation unit, which is usually of the order of 15 V and thus in the order of magnitude of the EoL DC utility signal, is used in a skilful manner for the evaluation.
  • the so-called EoL signal is characterized by the fact that it is intact Lamp is a signal of constant amplitude, whereas this signal is a rectangular signal when the lamp is defective.
  • the difference between the DC signal and the square wave signal can be evaluated in a very simple way. As a result, an extremely cost-effective and reliable EoL detection can be realized.
  • this has a capacitor which is arranged such that a voltage drops across it, which decreases the difference of the Gkichwoodsanteils the signals at the two inputs of the signal evaluation unit corresponds, wherein the capacitor is coupled via the series circuit of a diode and a resistor at the supply voltage terminal of the control unit. If, in turn, the so-called EoL signal at the connection point between the diode and the ohmic resistance is considered, an intact lamp can now be detected by a positive square-wave signal.
  • a defective lamp is characterized by a signal of constant amplitude in the case of a positive direct-voltage useful signal, while a negative direct-voltage signal produces a rectangular-shaped EoL signal which, in contrast to the square-wave signal with an intact lamp, also has negative amplitude components. These three signals are also quite easy to distinguish from each other and allow a cost-effective and reliable EoL detection of a lamp.
  • connection point between the diode and the ohmic resistance is coupled to a shutdown or Abregeleingang the control unit.
  • the signal evaluation unit can comprise a comparator unit for carrying out a comparison of the voltage components of the signals at its two inputs.
  • FIG. 1 shows an inventive electronic ballast for a lamp in a schematic representation. Since such electronic ballasts are well known, for the sake of clarity, only the part relevant to the invention is shown schematically.
  • a first S1 and second switch S2 which define a center M between them, are acted upon by the so-called intermediate circuit voltage U ZW .
  • the center M is coupled via an inductance L1 to a first terminal A1 of a lamp La.
  • the terminal A1 is also connected via a coupling capacitor C1 to the ground potential.
  • the second terminal A2 for the lamp La is coupled via a coupling capacitor C2 to the ground potential.
  • an inductor L1 is coupled between the center M of the half-bridge circuit and the first terminal A1 for a lamp.
  • the electronic ballast comprises a control unit 14 which activates the switch S1 via an output 10 and the switch S2 in a push-pull manner via an output 12 in a known manner with an e-hole frequency square wave signal.
  • the supply voltage U V of the control unit 14 is applied.
  • U v is 15 V.
  • the supply voltage U V is generated from the voltage U M at the midpoint of the bridge circuit by a bootstrap circuit comprising a capacitor C3 and a diode D1.
  • the potential at the capacitor C3 is applied to an input 1S of the control unit 14 and serves to supply a arranged in the control unit 14 driver circuit (not shown) for the signal at the output 10 of the control unit 14.
  • the electronic ballast according to the invention further comprises a Signahusêtsaku 20th of at its input 22, a signal is supplied to the the DC level of the terminal A2 for the lamp La is located.
  • the signal evaluation unit 20 is supplied with a signal which is at the DC voltage level of the terminal A1 for the lamp La.
  • the control unit 20 provides a so-called EoL signal, which is coupled to the input 25 of the control unit 14.
  • the input 25 of the control unit 14 is also connected via a resistor R1 to the supply voltage U v for the control unit 14. Via an optional line 29, the signal evaluation unit 20 is coupled to the capacitor C3.
  • the signal evaluation unit 20 is supplied with the potential at C3 as a supply voltage and not the voltage U V , which serves to supply the control unit 14, since the voltage U V is a permanently connected to the ground potential voltage and the signal evaluation unit 20 according to their mitschwingendem reference potential also a resonant Supply voltage required.
  • the line 29 is needed in an interpretation of the signal evaluation unit 20 with active components, while it is omitted in a realization of the signal evaluation unit 20 with passive components.
  • the potential at the midpoint M of the bridge circuit which is coupled to the signal evaluation unit 20 via the input 24, serves as DC reference potential for the signal evaluation unit 20.
  • Figure 2 shows a more detailed view of a detail of Figure 1, wherein the signal evaluation unit 20 is realized as an active circuit. It comprises a signal processing unit 30 which determines the difference in track voltage between the two signals applied to the inputs 22 and 24. It further comprises a delay unit 32, to which the output signal of the signal processing unit 30 is supplied. wherein the delay unit 32 serves to prevent premature shutdown due to only a short-term fulfillment of the shutdown condition. In particular, thereby shutdown states that last shorter than about 0.5 s, filtered out.
  • the output signal of the delay unit 32 is fed to a memory unit 34, in particular a latch memory. Between the output of the memory unit 34 and the output 26 of the signal evaluation unit 20, a diode D2 is arranged.
  • the latch After a lamp failure, the latch accumulates, so that the voltage provided at the output of the memory unit 34 corresponds to the voltage U M.
  • U M alternates between ground potential, ie 0 V, and the intermediate circuit voltage U ZW .
  • the memory unit 34 is designed so that it provides a "low" signal at its output in the activated state. Due to the fact that the reference potential of the signal evaluation unit 20 is the voltage U M , when the storage unit is activated, ie when the EoL situation has been established, the voltage U 34 at the output is, therefore, the output Memory unit 34, the voltage U M on. At the times when the voltage U 34 relative to ground potential 0 V, the diode becomes conductive and the EoL signal is neglecting the diode voltage U D2 to 0 V. If U 34 is equal to U ZW , locks the diode D2 and the EoL signal is U V equal to 15 V. In this context, reference is made to the representation in Figure 3a.
  • the memory unit 34 When the lamp is intact, the memory unit 34 provides a "high" signal at its output, ie U 34 is therefore U M + U V. Regardless of the changes of U M between 0 and U ZW , therefore, the potential at the cathode of the diode D2 is always equal to U V , so that the diode D2 always blocks.
  • the EoL signal is therefore the same constant U V , see the illustration in Figure 3b.
  • FIG. 4 shows a section from FIG. 1 corresponding to FIG. 2 when the signal evaluation unit 20 is realized by passive components.
  • the signal at the input 24 of the signal evaluation unit 20 is supplied to the parallel connection of a capacitor C4 and an ohmic resistor R3, while the signal at the input 22 of the signal evaluation unit 20 is coupled via an ohmic resistor R2 to the series circuit of the capacitor C4 with the ohmic resistor R3.
  • Diode D2 is present as in the embodiment of FIG. Referring to Figure 5, different states may occur depending on the DC difference between the signals at the inputs 22 and 24: where U C4 is the voltage between the terminal of the capacitor C4 connected to the diode D2 and the ground potential.
  • FIG. 5a This figure shows the time course of the EoL signal, ie the voltage at the input 25 of the control unit 14, with a positive DC voltage useful signal.
  • the diode D2 blocks and the EoL signal corresponds to the voltage U v , which is effected via the high-resistance resistor R1. If the voltage U C4 is greater than U M and less than U v plus U M. the diode D2 turns off at the times when U M is equal to U ZW . At the times when U M is 0, the diode D2 becomes conductive and transmits the voltage U C4 to the EoL input of the control unit 14. The voltage U v is suppressed due to the high-resistance resistor R1 and does not come into play.
  • FIG. 5b This figure shows the time profile of the EoL signal with a negative direct voltage useful signal.
  • the capacitor C4 is therefore charged negatively.
  • U M is equal to U ZW
  • this negative charge will impact as a result of the greens Voltage U ZW not off, the diode D2 turns off and the EoL signal is equal to U V.
  • diode D2 becomes conductive and the negative voltage to which C4 is charged dominates the EoL signal because R1 is high impedance.
  • FIG. 5c This figure shows the time course of the EoL signal with an intact lamp. Accordingly, U C4 is equal to U M , so that the diode becomes conductive at U M equal to 0V and the EoL signal is also 0 V. When U M is equal to U ZW , diode D2 turns off and the EoL signal is equal to U V.
  • a corresponding evaluation of the EoL signal is realized in the control unit 14.
  • the switches S1 and S2 are correspondingly driven via the outputs 10 and 12 of the control unit 14.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
EP06007435A 2005-04-14 2006-04-07 Ballast électronique pour une lampe Not-in-force EP1715729B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005017324A DE102005017324A1 (de) 2005-04-14 2005-04-14 Elektronisches Vorschaltgerät für eine Lampe

Publications (2)

Publication Number Publication Date
EP1715729A1 true EP1715729A1 (fr) 2006-10-25
EP1715729B1 EP1715729B1 (fr) 2008-01-30

Family

ID=36685666

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06007435A Not-in-force EP1715729B1 (fr) 2005-04-14 2006-04-07 Ballast électronique pour une lampe

Country Status (9)

Country Link
US (1) US7420334B2 (fr)
EP (1) EP1715729B1 (fr)
KR (1) KR20060108544A (fr)
CN (1) CN1849028B (fr)
AT (1) ATE385397T1 (fr)
CA (1) CA2542569A1 (fr)
DE (2) DE102005017324A1 (fr)
RU (1) RU2387108C2 (fr)
TW (1) TW200701838A (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5808422A (en) * 1996-05-10 1998-09-15 Philips Electronics North America Lamp ballast with lamp rectification detection circuitry
EP1003357A1 (fr) * 1996-03-14 2000-05-24 Mitsubishi Denki Kabushiki Kaisha Ballast pour lampe à décharge
EP1404162A2 (fr) * 2002-09-30 2004-03-31 Osram Sylvania Inc. Ballast avec protection adaptative en cas de détection de fin de durée de vie

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4560908A (en) * 1982-05-27 1985-12-24 North American Philips Corporation High-frequency oscillator-inverter ballast circuit for discharge lamps
US4727470A (en) * 1986-10-10 1988-02-23 Nilssen Ole K Resonant inverter having crest factor control

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1003357A1 (fr) * 1996-03-14 2000-05-24 Mitsubishi Denki Kabushiki Kaisha Ballast pour lampe à décharge
US5808422A (en) * 1996-05-10 1998-09-15 Philips Electronics North America Lamp ballast with lamp rectification detection circuitry
EP1404162A2 (fr) * 2002-09-30 2004-03-31 Osram Sylvania Inc. Ballast avec protection adaptative en cas de détection de fin de durée de vie

Also Published As

Publication number Publication date
TW200701838A (en) 2007-01-01
CN1849028B (zh) 2011-05-18
CN1849028A (zh) 2006-10-18
DE102005017324A1 (de) 2006-10-19
RU2387108C2 (ru) 2010-04-20
DE502006000320D1 (de) 2008-03-20
US20060232229A1 (en) 2006-10-19
US7420334B2 (en) 2008-09-02
ATE385397T1 (de) 2008-02-15
CA2542569A1 (fr) 2006-10-14
RU2006112322A (ru) 2007-10-20
EP1715729B1 (fr) 2008-01-30
KR20060108544A (ko) 2006-10-18

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