<p>A ballast circuit is suitable for driving a high intensity discharge lamp in at least two power modes including a nominal power mode for driving the high intensity discharge lamp at a nominal power and a reduced power dimming mode for driving the lamp at less than the nominal power. The lamp ballast circuit generates a first alternating current waveform during the nominal power mode and generates a background alternating current waveform in the reduced power mode which is perturbed at intervals by a high intensity pulse which helps to reduce the change in correlated color temperature which would otherwise occur in the dimming mode.</p>
申请公布号
WO2009099711(A1)
申请公布日期
2009.08.13
申请号
WO2009US30702
申请日期
2009.01.12
申请人
GENERAL ELECTRIC COMPANY;LI, JIANWU;CHALMERS, ALAN, G.