| 摘要 |
A two-stage electronic ballast ( 301; 401 ) for driving a gas discharge lamp comprises:-a half-bridge commutating forward stage ( 250 ) comprising a series arrangement of a first buffer capacitor ( 251 ) and a second buffer capacitor ( 252 ) connected between two bridge input terminals ( 261, 262 );-and a double flyback converter stage ( 310; 410 ) comprising an inductive energy storage buffer ( 320; 420 ) having at least one input circuit ( 330 ) suitable for receiving a rectified AC mains input voltage, the buffer further having at least two output circuits ( 340, 350 ), each output circuit being coupled to a respective buffer capacitor ( 251, 252 ) of said half-bridge commutating forward (HBCF) stage ( 250 ) for individually charging said buffer capacitors ( 251, 252 ).
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