| 摘要 |
A radio frequency (RF) power supply for an electrodeless lamp includes a pair of DC rails, an RF inverter having power input terminals connected betw een the rails, a first inductor arranged to inductively couple with an elect rodeless lamp, first and second resonance capacitors that each connects a re spective one of two input terminals of the first inductor to a same first ra il of the pair of DC rails, and a second (ballasting) inductor connecting an output of the RF inverter to one of the two input terminals of the first in ductor. Thus, the first inductor is connected in a symmetrical -filter and s upplied by two equal but phase-opposite voltages whose sum is the lamp volta ge. The inductance of the ballasting inductor is significantly reduced so th at the RF efficiency of the power supply is 96%.
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