| 摘要 |
A ballast ( 10 ) for powering at least one gas discharge lamp ( 20 ) comprises a switching converter ( 100 ) and an inverter ( 900 ). Switching converter ( 100 ) includes a transistor ( 130 ) and a control circuit ( 200 ) that provides substantially zero voltage switching of the transistor ( 130 ) at a very high frequency. Preferably, control circuit ( 200 ) includes a drive circuit ( 300 ), a turn-on synchronization circuit ( 400 ), a current mirror circuit ( 500 ), a rail voltage regulator circuit (600), and a lamp current regulator circuit ( 700 ). Drive circuit ( 300 ) is preferably realized by a circuit arrangement that includes a standard pulse-width modulation integrated circuit ( 310 ).
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