| 摘要 |
A lighting driver (700, 800) drives an LED-based lighting unit (20, 25). The lighting driver includes: an input (705, 805) configured to receive a trailing edge phase-cut dimming signal produced from an AC line voltage; a rectifier (720, 820) configured to rectify the trailing edge phase-cut dimming signal to produce a rectified trailing edge phase-cut dimming signal; a power stage (730, 830) configured to receive the rectified trailing edge phase-cut dimming signal and in response thereto to drive an LED-based lighting unit: a current sensing trailing edge detector (750, 850) configured to sense an input current supplied to the apparatus via the trailing edge phase-cut dimming signal and in response to the sensed input current to produce a dimming control signal; and a controller (760, 835) configured to control the power stage to adjust a dimming of the LED-based lighting unit in response to the dimming control signal. |
