| 摘要 |
A continuous dimming AC LED device is operated in association with a dimmer. When the dimmer adjusts brightness, the voltage supplied to the AC LED driver is reduced to decrease the brightness of an LED unit. When the supplied voltage is reduced to a working voltage required by the AC LED driver, a control unit detects the supplied voltage being lower than the working voltage, A control end of a voltage-controlled switch disconnects from the AC LED driver and connects to a power supply. Therefore, even the supply voltage is below the working voltage of the AC LED driver, the LED unit is prevented from being immediately turned off to maintain some brightness. With the dimmer, the brightness of the LED continuously and gradually. changes from full brightness to darkness,
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