| 摘要 |
A transformer includes a bobbin, a primary coil, a first secondary coil, a first core, a second core and a third core. The bobbin has a through hole. The primary coil and the first secondary coil are respectively surrounded on the bobbin. The first core is embedded into the through hole. The second core is coupled to the first core to form a magnetic loop. The third core is coupled to the first core and the second core and located between the primary coil and the first secondary coil. The third core having high impedance is fastened on the second core or the bobbin alternatively. A light tube driving circuit with the above transformer drives a discharge lamp.
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