Hon Hai Precision Industry Co., Ltd.

Che-Chen Fan Chiang

Chi-Hsiung Lee

Yu-Hsiao Chao

Cheng-Chueh Tsai

Tien-Hsiang Meng

Shian-Nan Lin

Kuo-Chi Liu

A device for driving a light source (L) including a first lamp (a) and a second lamp (a) includes two power supply circuits, two transformers ('), and two current balancing components (&#x2032;). Each power supply circuit includes a direct current (DC) power source (or&#x2032;) and a DC to alternating current (AC) converter (or&#x2032;). The DC/AC converters convert DC signals received from the corresponding DC power sources to AC signals. The transformers correspondingly convert the AC signals to other AC signals. The current balancing components are respectively connected between the transformers and the lamps. The feedback circuits correspondingly feed back current flowing through the lamps to the DC/AC converters.

Device for driving light sources

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

Growing community of inventors

Tu-Cheng, Taiwan

Che-Chen Fan Chiang