| 摘要 |
A lighting system employs a pair of ballast input stages ( 21 ) operable to oscillate at different oscillating frequency (f 1, f 2 ) upon an initial powering of the ballast input stages ( 21 ). The lighting system further employs a pair of ballast output stages ( 23 ) for establishing an open circuit voltage across the ballast output stages ( 23 ) in response to an absence of a loading of lamps ( 10 ) across the ballast output stages ( 23 ). The light system further employ means for, subsequent to the initial powering of the ballast input stages ( 21 ) and in response to the absence of the loading of the lamps ( 10 ) across the ballast output stages ( 23 ), impeding any parasitic loading across the ballast output stages ( 23 ) from phase locking the oscillating frequencies (f 1, f 2 ).
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