Patent ID: 7772784

Claim:
A transformer used for an illuminating apparatus, comprising: a closed-magnetic-circuit core; a primary coil wounded around the closed-magnetic-circuit core; and a plurality of secondary coils wounded around the closed-magnetic-circuit core, the plurality of secondary coils including respective first ends and respective second ends, wherein the illuminating apparatus comprises a plurality of discharge lamps; wherein the plurality of secondary coils includes a first secondary coil and a second secondary coil, a first end of the first secondary coil and a first end of the second secondary coil have polarities identical to each other; and a second end of the first secondary coil and a second end of the second secondary coil have polarities identical to each other; the plurality of discharge lamps includes a first discharge lamp and a second discharge lamp, the first discharge lamp having a first electrode and a second electrode, the second discharge lamp having a third electrode and a fourth electrode, the first end of the first secondary coil is connected to the first electrode of the first discharge lamp, the second end of the first secondary coil is connected to the third electrode of the second discharge lamp, the first end of the second secondary coil is connected to the fourth electrode of the second discharge lamp, and the second end of the second secondary coil is connected to the second electrode of the first discharge lamp.