Patent ID: 8115408

Claim:
A light source apparatus, comprising: a power supply, for providing a first AC voltage signal; a phase modulator, coupled to the power supply, for receiving the first AC voltage signal and modulating a conducting phase of the first AC voltage signal to generate a modulated phase adjustable AC voltage signal; wherein the phase information can be adjusted so as to achieve a light-adjusting effect; an electrical transformer, coupled to the phase modulator, for transforming the modulated AC voltage signal to generate a second AC voltage signal; a light source adjusting module, coupled to the electrical transformer, for generating a luminance adjusting signal according to a state of the second AC voltage signal; wherein the light source adjusting module comprises: a converting unit, for receiving the second AC voltage signal and converting the second AC voltage signal into a pulse signal; a counting and storage unit, coupled to the converting unit, for counting and storing a quantity of pulses of the pulse signal; a DAC, coupled to the counting and storage unit, for correspondingly generating a current control signal according to the quantity of the pulses of the pulse signal; and a current regulator, coupled to the DAC, for correspondingly generating the luminance adjusting signal according to the current control signal; and a light-emitting device, coupled to the light source adjusting module, for receiving the luminance adjusting signal to generate a corresponding light source.