| 摘要 |
An LED driving circuit to provide DC power to an LED to generate light includes a voltage-lowering regulation circuit, a rectification circuit and a filter and current-limiting circuit. The voltage-lowering regulation circuit aims to regulate impedance and provide a back electromotive force with polarity opposite to input voltage so that input power passed through the voltage-lowering regulation circuit is offset by the back electromotive force to a lower voltage. Then the input power passes through the rectification circuit to become DC power. The filter and current-limiting circuit receives the DC power and has at least one filter element to absorb or release the voltage to perform filtering and at least one current-limiting resistor to limit DC value. Therefore, the DC power has a steady voltage and current to energize the LED for lighting. |
