| 摘要 |
<p>The present invention relates to an LED lamp circuit of a serial connection type based on AC direct driving which is directly driven by an AC voltage and is easily implemented by a general semiconductor process. The present invention includes a bridge rectifier which fully rectifies the AC voltage and a plurality of unit LED units which are serially connected to the output terminal of the bridge rectifier and successively emit light according to the variation of the rectified AC voltage. The unit LED unit includes one LED and one switch element which is connected between an anode and a cathode of the LED.</p> |
