A high voltage transformer for controlling inductance leakage used for a
multiple lamp driving system includes at least one wire frame, a first
winding, a second winding, a first magnetic unit, and a second magnetic
unit. There is a receiving space in the wire frame for receiving the
first magnetic unit, and a first region and a second region is formed on
its surface. The first winding and the second winding are individually
wound at the first region and the second region. The second magnetic unit
is covered on the side of the wire frame. On an appropriate location of
the bottom of the second magnetic unit, a transverse beam extends.
Thereby, the transverse beam fully separates the low voltage magnetic
flux path produced on the first magnetic unit by the first winding and
the second winding and the high voltage magnetic flux path produced by
the AC.