Dimmer adapter device for gas discharge lamps, especially fluorescent lamps, has heating branch connected to a.c. source to supply electrode heating, voltage limiter in heating branch

摘要

The device has an a.c. voltage source (9) of controllable frequency for supplying at least one gas discharge lamp (2), a heating branch (22) connected to the a.c. source to supply the electrode heating and a voltage limiter (24) in the heating branch. The a.c. source has n a.c. converter circuit with at least two controlled switches and a control circuit for the switches.