| 摘要 |
The present invention is directed to an LED lighting source comprising a housing adapted for coupling to an AC power source; a rectifier circuit for converting the AC power to a DC supply; a power control circuit disposed in the housing and electrically connected to the DC supply; a string of LED's electrically connected between a control node of the power control circuit and the DC supply, the LEDs in the string being connected in series and being of a number selected to produce a voltage difference across the power control circuit sufficient to power active components of said power control circuit when powered from the DC supply and the power control circuit for limiting a forward current through the string to a nominal forward current of a single LED.
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