| 摘要 |
<p>PURPOSE: An AC/DC combination operating systems for a working led module is provided to increase the power efficiency by driving an LED module with a power supplied from a power supply unit. CONSTITUTION: An AC / DC LED drive unit receives a DC or a AC power source and drives an LED unit through a received power source. An AC / DC with LED drive unit comprises a bridge diode(10), a capacitor(12), and a constant current IC(20). The bridge diode rectifies the DC or the AC voltage. The capacitor limits the ripple of the voltage outputted from the bridge diode. The constant current IC outputs a constant current. The resistor(22) limits the current outputted from the constant current IC.</p> |
