| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a low-pressure discharge lamp lighting device capable of light-control lighting stably further to a low luminous flux than a control to set the lamp current or lamp power constant. <P>SOLUTION: The low-pressure discharge lamp lighting device is provided with an inverter circuit 4, constituted of one or more switching elements Q1, Q2 which switch-over the DC voltage outputted from a DC voltage source Vdc; a drive circuit 8 which turns on and off by a high frequency the switching elements Q1, Q2; and a resonance circuit which supplies a resonance voltage to a discharge lamp LA by being impressed with voltage switched over by the switching elements Q1, Q2. A feedback means 5 is installed, which adjusts turning on and off of DC voltage outputted from the DC voltage source Vdc or the switching elements Q1, Q2 so that the output of an operation means 10, which divides the voltage Vla of the discharge lamp LA detected by a lamp voltage detection means 11 by the current Ila of the discharge lamp LA detected by a lamp current detection means 13, is substantially equal to the reference voltage Vdim. <P>COPYRIGHT: (C)2010,JPO&INPIT |
