Patent ID: 6300719
Filing Date: 2001-10-09
Classification: H05B

Abstract:
Drive scheme for low pressure gas discharge lamps, driving one or more lamps, comprising:independently regulated high frequency current sources supplying the discharge currents directly to the lamps,independently regulated voltage sources supplying the heating currents to every filament,a control module having means to sense the value of discharge currents, discharge voltages, heating voltage and heating currents,a control module having means to regulate the value of current delivered by discharge current sources,a control module having means to regulate the value of voltage delivered by voltage sources supplying filaments,a control module capable, after sensing the value of discharge voltages, discharge currents, heating voltage and heating current, to detect the type of driven lamp and independently regulate the value of discharge current and heating voltage in the way providing proper values of discharge current and heating current for actually driven type of lamp.