Patent ID: 8013544
Filing Date: 2011-09-06
Classification: H05B,Y02B

Abstract:
1. A flyback controller for generating a switching signal that causes a switching system in a flyback converter to deliver current to a primary winding of a transformer in the flyback converter while the switching signal is in an on state and to stop delivering that current while the switching signal is in an off state, the flyback controller comprising: a dimmer input configured to receive a dimmer signal reflective of a chopped and rectified AC voltage, each cycle of which has 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 ratio of the off period to the on period being dependent upon a setting of the dimmer control; and a control circuit configured to generate the switching signal based on the dimmer signal from the dimmer input such that the switching signal: