Electric lamp and discharge devices: systems – Surge generator or inductance in the supply circuit
Patent
1998-06-22
1999-11-23
Shingleton, Michael B
Electric lamp and discharge devices: systems
Surge generator or inductance in the supply circuit
315290, 315291, 315278, H05B 3702
Patent
active
059906332
DESCRIPTION:
BRIEF SUMMARY
Circuit arrangement for operating a high-pressure discharge lamp as well as illumination system with a high-pressure discharge lamp and an operating device for the high-pressure discharge lamp
The invention relates to a circuit arrangement for operating a high-pressure discharge lamp according to the preamble of Patent claim 1 as well as an illumination system with a high-pressure discharge lamp and an operating device for the high-pressure discharge lamp.
TECHNICAL FIELD
In particular, the invention relates to a circuit arrangement for operating a low-wattage high-pressure halogen metal-vapour discharge lamp which is used for example in motor vehicle headlights and whose rated power is typically approximately 35 watts, as well as an illumination system comprising a low-wattage high-pressure halogen metal-vapour discharge lamp and an operating device coordinated therewith.
The high-pressure discharge lamp has a discharge vessel made of quartz glass which is closed off in a gas-type manner by means of molybdenum foil seals and is surrounded by an outer bulb. Two gas discharge electrodes project into the discharge space and are electrically conductively connected to external power supply leads via the molybdenum foil seals. The ionizable filling enclosed in the discharge space of this lamp is composed of xenon and metal halides.
The operating device, or the circuit arrangement accommodated in the operating device, for operating a high-pressure discharge lamp used in a motor vehicle headlight is usually supplied with electrical energy by the on-board electrical system of the motor vehicle. That is to say that the circuit arrangement is fed with a DC voltage of typically 12 V or 24 V by a low-voltage voltage source. With the aid of the circuit arrangement, this DC voltage supplied by the on-board electrical system must be stepped up so that it corresponds to the requirements necessary for lamp operation. For example, an ignition voltage of a few kilovolts is required to ignite the high-pressure discharge lamp in the cold state, while an ignition voltage of approximately 20 kV is necessary for the hot reignition of the same high-pressure discharge lamp, that is to say for ignition in the still hot state. After ignition, the operating voltage of the high-pressure discharge lamp, that is to say that voltage drop across the discharge path which is necessary to maintain the arc discharge, is only about 80 V to 100 V.
PRIOR ART
European Patent Specification EP 0 294 604 discloses a circuit arrangement for operating a high-pressure discharge lamp from a low-voltage voltage source, in particular for operating a 35 W high-pressure halogen metal-vapour discharge lamp from the 12 V on-board electrical system of a motor vehicle. This circuit arrangement has a self-starting push-pull converter, which is equipped with two alternately switching power transistors and two transformers. One transformer is a component part of the driving apparatus for the power transistors, while the other transformer serves to transmit the medium-frequency oscillation of the push-pull converter to a series resonant circuit. The high-pressure discharge lamp or the discharge path of the high-pressure discharge lamp is connected into a parallel circuit with the resonance capacitor of the series resonant circuit. The primary winding of the transformer belonging to the driving apparatus is connected in series with the secondary winding of the transformer supplying the series resonant circuit, in order to enable matching of the driving of the push-pull converter to the lamp to be operated. Furthermore, the circuit arrangement has an apparatus for changing the time constants of the control circuits of the push-pull converter in order, on the one hand, to ensure stabilization of the lamp power in the event of changes in the operating voltage and, on the other hand, to provide an increased starting current during the firing phase of the high-pressure discharge lamp. In order to ignite the high-pressure discharge lamp, a sinusoidal AC voltage havin
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Hirschmann Guenther
Lewandowski Bernd
Mengele Matthias
Mueller Stefan
Wittig Christian
Bessone Carlo S.
Patent-Treuhand-Gessellschaft fur elektrische Gluehlampen mbH
Shingleton Michael B
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