Circuit for supplying voltage to and controlling operating characteristics of light emitting diode(s) has inverter with power switches with variable switching frequency for brightness control

摘要

The circuit has at least one inverter connected to a d.c. source (1) and of variable output frequency with at least two controllable power switches (S1,S2) for converting the d.c. supply voltage into an alternating voltage and a load circuit connected to the inverter output and with a resonance element and at least one LED (D1,D2). The switching frequency of the power switches is variable to control LED brightness. Independent claims are also included for the following: a method of supplying voltage to and controlling the operating characteristics of at least one light emitting diode.