Abstract: A lighting apparatus includes a lighting module, a feedback control circuit, and a DC-to-AC circuit. The lighting module comprises a first lighting unit, a second lighting unit, a first transformer, a second transformer and a third transformer. A first end of a first port of the first transformer is connected to a first end of the first lighting unit, a first end of a first port of the second transformer is connected to a second end of the first lighting unit, a second end of the first port of the second transformer is connected to a first end of the second lighting unit, and a first end of a first port of the third transformer is connected to a second end of the second lighting unit. The lighting apparatus uses serial connection of the lighting units to reduce the number of transformers and still have the feedback control circuit.

Abstract: A multi-lamp system for driving a lamp set having a first lamp and a second lamp comprises a driving circuit for converting a DC signal to an AC signal, a transformer having a primary side coupled to the driving circuit and a secondary side for outputting the AC power, and a current balance circuit coupled to the low voltage terminal of the lamp set for balancing the current values flowing through the first lamp and the second lamp. The current balance circuit comprises a magnetic core, a first winding coupled to the first lamp and a second winding coupled to the second lamp. The first winding and the second winding are wound on the magnetic core and have the same coil number.

Abstract: A system for driving a plurality of lamps is disclosed to balance currents flowing through the lamps by means of impedance matching. According to the multi-lamp driving system of the present invention, a balancing controller is employed to match the impedance of each lamp path so as to regulate currents flowing through the lamps to be substantially the same.

Abstract: A multi-lamp system for driving a lamp set having a first lamp and a second lamp comprises a driving circuit for converting a DC signal to an AC signal, a transformer having a primary side coupled to the driving circuit and a secondary side for outputting the AC power, and a current balance circuit coupled to the low voltage terminal of the lamp set for balancing the current values flowing through the first lamp and the second lamp. The current balance circuit comprises a magnetic core, a first winding coupled to the first lamp and a second winding coupled to the second lamp. The first winding and the second winding are wound on the magnetic core and have the same coil number.