GDL Bulbs (2005-2007): 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 headlight. The ballast serves as a voltage regulator and generates alternating current (AC).
Primary tasks:
- Light the bulb.
- Regulate light during operation.
A initial voltage of about 24,000 V for a very brief period (less than 1 ms) is required to light the bulb.
The ballast transforms the vehicle's 12 V (DC) to 1000 V (AC).
The high voltage contact amplifies the voltage an addition 25 times.
Once the bulb has been lit, voltage is regulated down to about 100 V, which is required to keep the bulb lit.
Power consumption: 10 W.