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Improving EMC by contacting shielding of Xenon HID on the backside

IP.com Disclosure Number: IPCOM000031658D
Publication Date: 2004-Oct-04
Document File: 1 page(s) / 9K

Publishing Venue

The IP.com Prior Art Database

Abstract

ID298963/298964/298965/298966

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Improving EMC by contacting shielding of Xenon HID on the backside

A typical set-up for driving Xenon HID (High Intensity Discharge) lamps in automotive headlights consists of a driver, an igniter, and the Xenon HID lamp. The three components are typically arranged as described in figure 1:

Figure 1: System set-up driving a Xenon HID lamp

Improved systems integrate the igniter into the base of the Xenon HID lamp. The integrated igniter is connected to the driver by use of a three wired coaxial, shielded cable, called harness. The coaxial shielding of the harness allows a continuous shielding of the system, because the driver and the igniter are also capsulated by an electric conductive shielding. The shielding of the igniter is typically isolated to the electronics inside the igniter.

The complete shielding of the Xenon HID lamp inside an automotive headlamp is necessary in order to get the best EMC (ElectroMagnetic Compatibility) performance. The EMC performance can be optimized by contacting any electrical conductive material inside the headlamp to the shielding of the igniter. The more surface of the igniter shielding is contacted the more efficient the EMC performance is improved.

Typically the effective contact surface of the igniter is reduced, because an isolating sticker with traceability information printed on covers at least one more or less big part of the surface of the igniter shielding.

In case the set-maker of the headlamp requires just this part o...