Arrangement for detecting the ignition of a high-pressure gas discharge lamp
First Claim
1. An arrangement for detecting the ignition of a high-pressure gas discharge lamp, in particular for use in a motor vehicle headlamp, wherein a circuit for supplying the high-pressure gas discharge lamp with burning energy, a control circuit as well as an ignition circuit for the lamp are provided;
- an auxiliary voltage for the ignition is provided only to the ignition circuit; and
, the control circuit is designed such that it detects the ignition (1, 31,
51) of the high-pressure gas discharge lamp essentially without delay via the behavior or the status of the auxiliary voltage (UH) that is supplied during the ignition (1, 31,
51).
1 Assignment
0 Petitions
Accused Products
Abstract
An arrangement for detecting the ignition of a high-pressure gas discharge lamp, in particular for use with a motor vehicle headlamp, comprising a circuit for supplying the high-pressure gas discharge lamp with burning energy, a control circuit and an ignition circuit. The ignition circuit is provided with an auxiliary voltage for the ignition. The control circuit is configured such that it detects the ignition of the high-pressure gas discharge lamp immediately via the behavior or the status of the auxiliary voltage (UH). The control circuit can be provided with a microcontroller (20). The auxiliary voltage supplied during the ignition is connected to the microcontroller in such a way that the microcontroller detects the ignition without delay. For this, the auxiliary voltage is supplied via a voltage divider (22, 23, 24) with logic potential to the external interrupt input (21) of the microcontroller. The declining edge or the low voltage level developing during the ignition as a result of the collapse of the auxiliary voltage is detected immediately by the if microcontroller and is interpreted as ignition.
10 Citations
8 Claims
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1. An arrangement for detecting the ignition of a high-pressure gas discharge lamp, in particular for use in a motor vehicle headlamp, wherein a circuit for supplying the high-pressure gas discharge lamp with burning energy, a control circuit as well as an ignition circuit for the lamp are provided;
- an auxiliary voltage for the ignition is provided only to the ignition circuit; and
, the control circuit is designed such that it detects the ignition (1, 31,
51) of the high-pressure gas discharge lamp essentially without delay via the behavior or the status of the auxiliary voltage (UH) that is supplied during the ignition (1, 31,
51). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- an auxiliary voltage for the ignition is provided only to the ignition circuit; and
Specification