| 摘要 |
<p>A centrally-controlled electronic ballast which can centrally control a plurality of discharge lamps is provided. The electronic ballast has a power output unit which generates two DC power, including first power which is used in amplification to the level of high voltage, and second power which is used in generation of a square-wave signal; a switching unit which operates at a predetermined frequency according to a switching signal, chops the second power into a square-wave signal; an inverter unit which receives the square-wave signal having the level of the second power, amplifies the received signal to a square-wave signal having the level of the first power, and provides the power to a discharging lamp; a current feedback unit which detects the output current of the inverter unit and feeds the detected current to the switching unit; and a switching control unit which controls the output of the inverter unit by adjusting the pulse phase of the switching signal. Accordingly, the ballast has high efficiency with the structure.</p> |
