| 摘要 |
A LED driving device includes a plurality of LEDs, a voltage detecting circuit, and a current switching circuit. When the voltage detecting circuit detects the different voltage level of power source without coupling to a filtering capacitor, it sends a signal to the current switching circuit and then the current switching circuit is automatically activated to electrically rearrange the configuration of LEDs with a predetermined current value by lighting the greatest number of LEDs that improving the power factor and efficiency.
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