EP1424879A1 - Circuit électrique pour commander plusieurs tubes à décharge - Google Patents

Circuit électrique pour commander plusieurs tubes à décharge Download PDF

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Publication number
EP1424879A1
EP1424879A1 EP03103649A EP03103649A EP1424879A1 EP 1424879 A1 EP1424879 A1 EP 1424879A1 EP 03103649 A EP03103649 A EP 03103649A EP 03103649 A EP03103649 A EP 03103649A EP 1424879 A1 EP1424879 A1 EP 1424879A1
Authority
EP
European Patent Office
Prior art keywords
circuit
voltage
electrical circuit
oscillator
circuit according
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
EP03103649A
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German (de)
English (en)
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EP1424879B1 (fr
Inventor
Andreas Krespach
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1424879A1 publication Critical patent/EP1424879A1/fr
Application granted granted Critical
Publication of EP1424879B1 publication Critical patent/EP1424879B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H05B41/2821—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 single-switch converter or a parallel push-pull converter in the final stage
    • H05B41/2824—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 single-switch converter or a parallel push-pull converter in the final stage using control circuits for the switching element
    • 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
    • H05B41/24—Circuit arrangements in which the lamp is fed by high frequency ac, or with separate oscillator frequency
    • H05B41/245—Circuit arrangements in which the lamp is fed by high frequency ac, or with separate oscillator frequency for a plurality of lamps

Definitions

  • the present invention relates to an electrical circuit for controlling several Gas discharge tubes, in particular for illuminating display devices in motor vehicles.
  • gas discharge tubes or lamps such as. B. cold cathode fluorescent tubes, Glow cathode fluorescent tubes, mercury vapor lamps, metal halide lamps, Neon lamps or the like, high-voltage sources with special properties needed.
  • cold cathode fluorescent tubes have a very high efficiency, they are particularly useful used in systems where long battery life is desired or in which thermal requirements require lighting systems with little power loss. For example, they are used to illuminate display devices in instrument panels used by motor vehicles. Depending on the type of cold cathode fluorescent lamps Light of different colors, for example white or reddish light, are generated. To the Operating the cold cathode fluorescent lamps has an operating voltage of approx. 1 to 2.5 kV AC voltage necessary. Because when used in motor vehicles as supply voltage the on-board power supply, which is usually 12 volts or possibly in future systems also provides 42 volts DC, can be used, it is known via a DC / AC converter and convert to the operating voltage of the cold cathode fluorescent lamp combinzutransformieren.
  • a so-called standard circuit for controlling cold cathode fluorescent lamps is used Royer oscillator used, the transformer as a complex component direct component of the oscillator.
  • the physical parameters, such as winding inductances and capacitances have a direct influence on the behavior of the complete oscillator circuit. Therefore, the operation of multiple cold cathode fluorescent lamps on one Transformer generally avoided or with technically very complex transformers realized with several output windings.
  • the electrical circuit according to the invention with the features of claim 1 is opposite the known approaches have the advantage that those to be controlled for the operation Cold cathode fluorescent lamps necessary high voltage only in the immediate vicinity of the Cold cathode fluorescent lamps is generated. Thus, they are high voltage or leading components in localized areas near the cold cathode fluorescent lamps to be controlled in each case arranged, which causes the above-mentioned electromagnetic radiation problems and electromagnetic losses can be reduced. In addition, the a low voltage components of the oscillator only once for operation several cold cathode fluorescent lamps can be provided.
  • the electrical Circuit provided a first jointly provided for all cold cathode fluorescent lamps to be controlled Circuit part which consists of the components of an oscillator carrying a low voltage, in particular two switching transistors, a resonant circuit capacitor and a storage choke, consists; second circuit parts, each one of the cold cathode fluorescent lamps to be controlled are assigned locally and each have a transformer with associated High voltage circuit for transforming the low voltage into a high voltage to control the respectively assigned cold cathode fluorescent lamp; and the Has low-voltage leads, which the first circuit part with each suitably connect assigned second circuit parts.
  • At least one second circuit part has one Auxiliary winding for a commutation of the oscillator, which with the bases of switching transistors of the first circuit part is connected. Is a short-circuit strength of the high voltage circuit required, the auxiliary windings of all transformers involved in Series connection can be used for commutation.
  • a DC voltage source is to be supplied a DC supply voltage, for example of 12 V or 42 V, provided on the Base of one of the transistors and on the emitters of both transistors of the first circuit part as well as the storage choke.
  • the first circuit part has an oscillating circuit capacitor on.
  • the first circuit part has a resistor for an oscillation of the oscillator.
  • the first circuit part has a storage inductor on, which ensures a sinusoidal oscillation of the oscillator.
  • controller device for activation of the first circuit part.
  • the oscillator is designed as a Royer oscillator.
  • the second circuit parts are on the primary side electrically connected in parallel.
  • it may also be a series connection advantageous.
  • the discharge tubes or cold cathode fluorescent lamps spatially spaced from each other.
  • FIG. 1 shows a schematic view of a electrical circuit for driving a plurality of spatially spaced discharge tubes according to an embodiment of the present invention.
  • an electrical circuit 1 for controlling a plurality of discharge tubes preferably cold cathode fluorescent lamps 4a, 4b, etc. illustrated.
  • two cold cathode fluorescent lamps 4a, 4b are driven, whereby according to further, not shown embodiments, the number of cold cathode fluorescent lamps to be controlled can vary as desired.
  • the cold cathode fluorescent lamps 4a, 4b etc. serve, for example, to illuminate a display device of a motor vehicle, which in a dashboard of a motor vehicle is arranged.
  • the upper cold cathode fluorescent lamp 4a a colored illumination of one outer region of a display device serves while the lower cold cathode fluorescent lamp 4b and the other cold cathode fluorescent lamps provided in other areas illuminate the same display device.
  • a speed indicator, a fuel gauge, a temperature display, any display, a clock etc. in the dashboard of the motor vehicle are illuminated.
  • the electrical circuit 1 preferably consists of two circuit parts, a first circuit part 2 and a second circuit part 3, the first circuit part 2 the low voltage side Part and the second circuit part 3, the high-voltage part of an oscillator, in particular of a Royer oscillator.
  • the first circuit part 2 preferably consists of a DC voltage source 20 for supply a DC supply voltage, for example of 12 volts or 42 volts.
  • the DC voltage source 20 is connected to a "+" terminal and a "-" terminal. From the "+" terminal leads a storage choke 21, which ensures a sinusoidal oscillation of the oscillator, to a third low-voltage line 43, which taps to the center Primary windings 33a, 32b of the respectively assigned transformer 31a or 31b for one Control of the associated cold cathode fluorescent lamps 4a and 4b leads.
  • the "+" terminal leads via a resistor 22 to the base of a first transistor 23, whose emitter is connected to the emitter of a second transistor 24.
  • the "-" terminal of the DC voltage source 20 is present at the two emitters of transistors 23 and 24.
  • the resonant circuit capacitor 25 is between the collectors of the two transistors 23 and 24 created.
  • the components of the first circuit part 2 explained on the low voltage side are a component of the oscillator.
  • the circuit part 2 has to control several cold cathode fluorescent lamps 4a, 4b, etc. are provided only once, i.e. H. the first circuit part 2 is used to simultaneously control a plurality of cold cathode fluorescent lamps, only low-voltage components and lines are provided in circuit part 2.
  • the electrical circuit 1 also consists of the cold cathode fluorescent lamps to be controlled 4a, 4b etc. assigned second circuit parts 3a, 3b etc.
  • the second circuit parts 3a, 3b each consist of a transformer 31a, 31b.
  • One end of the primary winding 32a or 32b of the respective transformer 31a, 31b is in each case via a first one common low-voltage line 41 with one side of the resonant circuit capacitor 25 and connected to the collector of the second transistor 24.
  • the other end of the primary winding 32a or 32b of the respective transformer 31a or 31b is analogous to a second one common low voltage line 42 with the other end of the resonant circuit capacitor 25 and the collector of the first transistor 23 connected.
  • the primary windings 32a, 32b of the respective transformers 31a, 31b are connected via a central tapping via a third common low-voltage line 43 with the transformer side End of the storage choke 21 connected.
  • an auxiliary winding 30 is the Associated transformer 31a, as shown in the figure, the ends of the auxiliary winding 30 are connected to the bases of the two transistors 23 and 24.
  • the transformers 31a, 31b each have a secondary winding 33a and 33b for one Transformation of the low voltage into a high voltage for control of each assigned cold cathode fluorescent lamp 4a or 4b.
  • the second circuit parts 3a and 3b described above can be localized from one another spaced, locally separated from the common first circuit part 2 and close to each cold cathode fluorescent lamp 4a or 4b to be controlled.
  • the base of the first transistor 23 is connected to the Resistor 22 is charged with an interference signal and thus energized. This is done through the second low-voltage line 42 and the first low-voltage line 41 a current flow through the primary winding 32a of the transformer 31a, thereby in the associated auxiliary winding 30 a current flow is also induced.
  • the second transistor 24 continues to be blocked and the first transistor 23 in contrast Flow direction switched. Because of this asymmetry between the two transistors 23 and 24, one of the two leaves the area earlier due to a current increase Saturation. A voltage drops between its collector and its emitter. hereby sets an oscillation on the resonant circuit, which by the primary winding 32a and Resonant circuit capacitor 25 is formed.
  • the control or switching of the transistors 23 and 24 takes place by means of the auxiliary winding 30, in which a corresponding magnetic field due to the current flow in the primary winding 32a is induced, creating a parallel forced resonant circuit arrangement , which forces the switching of the transistors 23, 24.
  • the frequency of the resonant circuit arrangement or of the oscillator results from the capacitance of the Resonant circuit capacitor 25, the parasitic winding capacitance and the inductance of the primary winding 32a of the transformer 31a.
  • the inductance of the primary winding 32a of the transformer 31a can also be used as a replacement inductor for several individual inductors connected in parallel a plurality of primary windings 32a, 32b, etc. a plurality of transformers 31a, 31b, etc. are formed his.
  • the respective transformers 31a, 31b serve to transform the applied ones Low voltage into a corresponding high voltage, for example 1 kV, for one Control of the correspondingly assigned cold cathode fluorescent lamps 4a, 4b.
  • the You can use several smaller transformers or individual inductors in total achieve a more favorable overall structure than when using a single one large transformer is possible.
  • the reduction of the total inductance by smaller ones individual inductors connected in parallel can be increased by increasing the capacitance of the Resonant circuit capacitor are compensated.
  • the characteristic ones choose sizes such that a resonant circuit frequency of about 40 kHz to 60 kHz for a optimal control of the respective cold cathode fluorescent lamps 4a, 4b etc. created becomes.
  • the present invention provides a system in which the low voltage ones Components in the motor vehicle only once for controlling a plurality of cold cathode fluorescent lamps are provided, and in which the transformers or the one Components carrying high voltage close to the cold cathode fluorescent lamp to be controlled in each case are provided.
  • the corresponding supply lines therefore only need to be used as low-voltage lines be formed, as opposed to conventional circuits only lead a low voltage to the cold cathode fluorescent lamps to be controlled.
  • High voltage areas are provided, which causes the above-mentioned electromagnetic radiation problems and losses can be avoided or reduced.
  • the secondary winding of a cold cathode fluorescent lamp may be less expensive assigned transformer according to the principle explained above in splitting several individual transformers if the very high voltages are generated the insulation strength of the primary winding is a problem.
  • any number of second circuit parts can be activated can be provided according to the number of associated cold cathode fluorescent lamps.
  • a microprocessor unit or a controller device is used for intelligent control of the first circuit part.
  • a microprocessor unit or a controller device is used for intelligent control of the first circuit part. For example, a Dimming of the cold cathode fluorescent lamps via a potentiometer depending on one The ambient brightness measured using a light sensor can be regulated accordingly.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
EP20030103649 2002-11-26 2003-10-02 Circuit électrique pour commander plusieurs tubes à décharge Expired - Lifetime EP1424879B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2002154983 DE10254983A1 (de) 2002-11-26 2002-11-26 Elektrische Schaltung zur Ansteuerung von mehreren Entladungsröhren
DE10254983 2002-11-26

Publications (2)

Publication Number Publication Date
EP1424879A1 true EP1424879A1 (fr) 2004-06-02
EP1424879B1 EP1424879B1 (fr) 2009-03-11

Family

ID=32240407

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030103649 Expired - Lifetime EP1424879B1 (fr) 2002-11-26 2003-10-02 Circuit électrique pour commander plusieurs tubes à décharge

Country Status (2)

Country Link
EP (1) EP1424879B1 (fr)
DE (2) DE10254983A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4626747A (en) * 1984-01-09 1986-12-02 Nilssen Ole K Class-3 lighting system
EP0374724A1 (fr) * 1988-12-21 1990-06-27 Zumtobel Aktiengesellschaft Rail d'alimentation pour appareil d'éclairage
US5053681A (en) * 1989-04-17 1991-10-01 Robert G. Lockwood Remote electrical converter
EP0673184A2 (fr) * 1994-03-16 1995-09-20 Linear Technology Corporation Alimentation pour tube fluorescent et circuit de contrôle à grande plage de variation
DE19737786A1 (de) * 1997-08-29 1999-03-04 Bosch Gmbh Robert Schaltungsanordnung zur Ansteuerung wenigstens einer Kaltkathodenfluoreszenzlampe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4626747A (en) * 1984-01-09 1986-12-02 Nilssen Ole K Class-3 lighting system
EP0374724A1 (fr) * 1988-12-21 1990-06-27 Zumtobel Aktiengesellschaft Rail d'alimentation pour appareil d'éclairage
US5053681A (en) * 1989-04-17 1991-10-01 Robert G. Lockwood Remote electrical converter
EP0673184A2 (fr) * 1994-03-16 1995-09-20 Linear Technology Corporation Alimentation pour tube fluorescent et circuit de contrôle à grande plage de variation
DE19737786A1 (de) * 1997-08-29 1999-03-04 Bosch Gmbh Robert Schaltungsanordnung zur Ansteuerung wenigstens einer Kaltkathodenfluoreszenzlampe

Also Published As

Publication number Publication date
DE50311271D1 (de) 2009-04-23
DE10254983A1 (de) 2004-06-03
EP1424879B1 (fr) 2009-03-11

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