DIMMER CONTROL LEAKAGE PULL DOWN USING MAIN POWER DEVICE IN FLYBACK CONVERTER

摘要

A flyback controller may include a dimmer input configured to receive a chopped and rectified AC voltage Each cycle of the signal may have an off period which is substantially attenuated but not always zero due to leakage of a dimmer control from which the chopped AC voltage originates, and an on period which substantially tracks the AC voltage The flyback controller may include a control circuit configured to generate a switching signal based on the signal from the dimmer input The switching signal may controllably oscillate between its on and off states during the on periods of the chopped and rectified AC voltage The switching signal may be in the on state during the off periods of the chopped and rectified AC voltage, thereby preventing a voltage build up from the dimmer control leakage