Patent ID: 8866411

Claim:
A discharge lamp system comprising: a discharge lamp; a power supply device for providing a DC power; a converter connected to the power supply device and the discharge lamp and configured for converting the DC power into a current required by the discharge lamp; a lamp state signal detection module for receiving a lamp state signal and outputting a lamp state detection signal; and a controller connected to the lamp state signal detection module and configured for receiving the lamp state detection signal and a synchronization signal to generate an average lamp current signal and a pulse current signal, which corresponds to the lamp state detection signal and the synchronization signal, and for outputting a control signal which corresponds to the average lamp current signal and the pulse current signal to the converter, wherein the controller further comprises: a microprocessor for receiving the lamp state detection signal and the synchronization signal and generating a processing signal which corresponds to the current control of the discharge lamp, wherein the microprocessor comprises: a microprocessing unit for receiving the lamp state detection signal and the synchronization signal to generate a first digital signal which corresponds to the lamp state detection signal and a second digital signal which corresponds to the synchronization signal; a first digital-to-analog (D/A) converter for converting the first digital signal into the average lamp current signal; and a second digital-to-analog (D/A) converter for converting the second digital signal into the pulse current signal; and a control circuit connected to the microprocessor and configured for receiving the processing signal and outputting the control signal which corresponds to the processing signal to the converter, wherein the processing signal further comprises the average lamp current signal and the pulse current signal; wherein the converter performs current control of the discharge lamp according to the received control signal.