Hon Hai Precision Industry Co., Ltd.

Shian-Nan Lin

Chi-Hsiung Lee

Yu-Hsiao Chao

Cheng-Chueh Tsai

Yi-Hsun Lin

Cheng-Chia Hsu

Che-Chen Fan Chiang

Deng-Kang Chang

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.

Lighting apparatus formed by serially-driven lighting units

A system for driving a lamp module () includes a converter (), a driving circuit (), and a pulse width modulation (PWM) controller (). The lamp module includes a plurality of lamps. The converter converts a received voltage to a direct current (DC) voltage. The driving circuit converts the DC voltage to an alternating current (AC) voltage. The PWM controller is connected between the converter and the lamp module, for regulating the DC voltages outputted from the converter according to current flowing through the lamps of the lamp module. In one embodiment, the system includes a bus inverter controller. The bus inverter controller is connected between the driving circuit and the lamp module, for regulating a working frequency thereof and controlling the AC voltage outputted from the driving circuit when the lamps are turned on. The system has a reduced number of PWM controllers and a relatively low cost.

System for driving plural lamps

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Hsin-Chu, Taiwan

Shian-Nan Lin