GDL Bulbs (2002-2004): Design: Ballast
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2007 Volvo V70, 2006 Volvo V70, 2005 Volvo V70, 2004 Volvo V70, and 2003 Volvo V70. However, it is still accessible from the selected car via links, so may be relevant.
An electronic ballast is connected to each headlamp. The ballast functions as a voltage regulator and generates alternative current (AC).
Main tasks:
- Light the bulb
- Control the light during operation.
To light the bulb an initial voltage of approximately 24, 000 V is required for a very short time (less than 1ms).
The ballast transforms the vehicles 12 V (DC) to 1000 V (AC).
The high tension switch amplifies the voltage a further 25 times.
When the lamp is lit the voltage is reduced to the 100 V required to keep the lamp lit.
Power consumption: 10 W.