Patent ID: 6175198
Filing Date: 2001-01-16
Classification: H05B,Y02B

Abstract:
In a ballast for an electrodeless lamp, a dimming circuit for decreasing output of a d.c.-to-a.c. converter for selective dimming of the electrodeless lamp, said dimming system comprising:a first dimming switch;a second dimming switch connected in series to the first dimming switch;a voltage source, a first-end of the voltage source connected to the first dimming switch and a second end of the voltage source connected to the second dimming switch;a signal source configured to generate a modulated signal, supplied to the first and second dimming switches,wherein receipt of the modulated signal, initiates activation of the first and second dimming switches, and causes a current to flow through the first and second dimming switches, thereby decreasing the output of the d.c.-to-a.c. converter.