Patent ID: 6593709
Filing Date: 2003-07-15
Classification: H05B,Y10S

Abstract:
An electronic dimmer comprising:a main switch controller for receiving a sawtooth waveform having a predetermined frequency and an amplitude and for receiving a voltage signal having a maximum value greater than the amplitude, wherein the voltage signal is received via a dimming terminal and wherein the main switch controller is adapted to generate a burst dimming signal for use in controlling a switch by comparing the voltage signal with the sawtooth waveform; a current supply starter for generating a current supply starting signal when the voltage signal is greater than the maximum value; a current source for supplying a current for varying a reference voltage according to the current supply starting signal; a reference voltage generator for generating a reference voltage when substantially no current is provided via the current source, wherein the reference voltage generator is adapted to vary the reference voltage based on the current supplied by the current source; and a feedback unit for comparing the reference voltage to a voltage generated by a load current and for varying the brightness of a lamp based on the reference voltage.