EP0429402A2 - Einrichtung zur Versorgung von Leuchtstofflampen in Motorfahrzeugen - Google Patents

Einrichtung zur Versorgung von Leuchtstofflampen in Motorfahrzeugen Download PDF

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Publication number
EP0429402A2
EP0429402A2 EP90830461A EP90830461A EP0429402A2 EP 0429402 A2 EP0429402 A2 EP 0429402A2 EP 90830461 A EP90830461 A EP 90830461A EP 90830461 A EP90830461 A EP 90830461A EP 0429402 A2 EP0429402 A2 EP 0429402A2
Authority
EP
European Patent Office
Prior art keywords
signal
lamp
output
inverter
supplied
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Withdrawn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
EP90830461A
Other languages
English (en)
French (fr)
Other versions
EP0429402A3 (en
Inventor
Andrea Nepote
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.)
Marelli Europe SpA
Original Assignee
Marelli Autronica SpA
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 Marelli Autronica SpA filed Critical Marelli Autronica SpA
Publication of EP0429402A2 publication Critical patent/EP0429402A2/de
Publication of EP0429402A3 publication Critical patent/EP0429402A3/en
Withdrawn legal-status Critical Current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
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor

Definitions

  • the present invention relates to a device for supplying power to gas-discharge lamps for use in a vehicle.
  • the invention relates to a supply device comprising: an inverter with an input for connection to the battery of the vehicle, and an ignitor connected to the output of the inverter for connection to (at least) one gas-discharge lamp, the inverter including a regulator which is adapted to modify a characteristic of the current supplied to the lamp in operation.
  • this type of supply device When used in a motor vehicle, this type of supply device cannot always ensure the correct supply to the lamp, particularly because of variations in the battery voltage, in the ambient temperature and in the voltage across the terminals of the lamp.
  • the object of the present invention is to provide a device for supplying power to gas-discharge lamps which can prevent these problems.
  • this object is achieved by means of a supply device of the type specified above, whose main characteristic lies in the fact that it also includes a feedback control circuit for monitoring the electrical power supplied to the at least one lamp in operation and for supplying the regulator of the inverter with a signal for causing a substantially constant power to be supplied to the at least one lamp.
  • a conventional device for supplying power to a gas-discharge lamp L is indicated 1.
  • the supply device includes an inverter 2 with an input 2a for connection to the battery B of the vehicle and an output 2b connected to the lamp L by means of an ignitor 3 with a passive resonant L-C circuit of known type.
  • the inverter 2 includes, in known manner, a regulator 4 which is adapted to modify a characteristic (for example, the frequency and/or the duty-cycle) of the current supplied to the lamp L.
  • a characteristic for example, the frequency and/or the duty-cycle
  • the supply device 1 is associated with a feedback control circuit, generally indicated 5, having two inputs 5a and 5b.
  • the input 5a is connected to the output of the ignitor 3 to monitor the voltage supplied to the lamp L in operation.
  • the input 5b is connected to a resistor 6 between the lamp L and earth to monitor the current I flowing in the lamp.
  • the output of the feedback control circuit 5 is connected to the regulator 4 of the inverter 2.
  • the feedback control circuit 5 monitors the electrical power supplied to the lamp L and generates and supplies to the regulator 4 of the inverter a signal for causing a substantially constant power to be supplied to the lamp.
  • the circuit 5 includes an attenuator 7 and an amplifier 8 which receive signals indicative of the voltage applied to the lamp L and of the current flowing through the lamp, respectively.
  • the outputs of the attenuator 7 and the amplifier 8 are connected to an analog multiplier 9 which thus outputs a signal proportional to the power supplied to the lamp.
  • the signal output by the analog multiplier 9 passes through a filter 10 which, essentially, performs an averaging operation and outputs a signal indicative of the average power supplied to the lamp.
  • This signal reaches a comparison circuit 11 which is formed, for example, with the use of an operational amplifier and outputs an error signal E p indicative of the difference between the signal from the filter 10 and a predetermined constant reference, indicated k.
  • the error signal E p is supplied, after amplification at 12, to the input of the regulator 4 of the inverter 2.
  • the circuit 5 includes two peak detectors 17 and 18 which output respective signals indicative of the peak values of the voltage supplied to the lamp L and of the current flowing through the lamp, respectively. These peak values will simply be indicated V and I respectively.
  • the output of the peak detector 17 is connected to an adder circuit 19 which adds algebraically a constant positive voltage V0 to the voltage -V.
  • the output of the adder circuit 19 is connected to an attenuator circuit 20 which in fact reduces the amplitude of the signal received by a constant factor.
  • the attenuator 20 therefore has an output signal, indicated I REF , given by the equation: which is just like Equation (2) above.
  • the signal I REF is thus indicative of the level at which the current in the lamp L must be maintained in order to ensure that the power supplied to the lamp is kept constant. Obviously, this is true within the limits of the linear approximation described above.
  • the attenuator circuit 20 and the peak detector 18 are connected to a comparison circuit 21 which adds algebraically the signals supplied to it and outputs an error signal E I indicative of the difference between the current I actually flowing through the lamp L and the current I REF necessary to keep the power supplied to the lamp constant.
  • the feedback control circuit 5 of Figure 3 is a simpler circuit which can nevertheless operate reliably and with sufficient accuracy.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
EP19900830461 1989-10-20 1990-10-16 A device for supplying power to gas-discharge lamps for use in motor vehicles Withdrawn EP0429402A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8967903A IT8967903A0 (it) 1989-10-20 1989-10-20 Dispositivo alimentatore per lampade a scarica di gas per l'impiego a bordo di autoveicoli.
IT6790389 1989-10-20

Publications (2)

Publication Number Publication Date
EP0429402A2 true EP0429402A2 (de) 1991-05-29
EP0429402A3 EP0429402A3 (en) 1991-07-31

Family

ID=11306234

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900830461 Withdrawn EP0429402A3 (en) 1989-10-20 1990-10-16 A device for supplying power to gas-discharge lamps for use in motor vehicles

Country Status (3)

Country Link
EP (1) EP0429402A3 (de)
JP (1) JPH03147293A (de)
IT (1) IT8967903A0 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994004011A1 (en) * 1992-08-01 1994-02-17 Coolite Limited Fluorescent tube driver and lighting system
EP0633711A4 (de) * 1992-03-25 1997-03-26 Toto Ltd Leistungsregler für eine entladungslampe und beleuchtungsapparat mit variabler farbe, versehen mit solch einem leistungsregler.
WO2007104666A1 (de) * 2006-03-15 2007-09-20 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Geregeltes vorschaltgerät für eine lampe

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008007925A1 (en) * 2006-07-14 2008-01-17 Lg Innotek Co., Ltd Apparatus and method for controlling driving of lamp

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8625329D0 (en) * 1986-10-22 1986-11-26 Valor Int Ltd Control gear for gas discharge lighting
DE3715162A1 (de) * 1987-05-07 1988-11-17 Bosch Gmbh Robert Schaltungsanordnung zum betrieb einer gasentladungslampe an einer gleichstromquelle
US4952848A (en) * 1988-07-05 1990-08-28 North American Philips Corporation Signal generating circuit for ballast control of discharge lamps

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0633711A4 (de) * 1992-03-25 1997-03-26 Toto Ltd Leistungsregler für eine entladungslampe und beleuchtungsapparat mit variabler farbe, versehen mit solch einem leistungsregler.
WO1994004011A1 (en) * 1992-08-01 1994-02-17 Coolite Limited Fluorescent tube driver and lighting system
WO2007104666A1 (de) * 2006-03-15 2007-09-20 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Geregeltes vorschaltgerät für eine lampe

Also Published As

Publication number Publication date
IT8967903A0 (it) 1989-10-20
JPH03147293A (ja) 1991-06-24
EP0429402A3 (en) 1991-07-31

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