ADAPTIVE DIMMER DETECTION AND CONTROL FOR LED LAMP

摘要

An LED lamp is provided in which the output light intensity of the LEDs in the LED lamp is adjusted based on the input voltage to the LED lamp. A dimmer control unit detects a type of dimmer switch during a configuration process. Using the detected dimmer type, the dimmer control unit generates control signals appropriate for the detected dimmer type to provide regulated current to the LEDs and to achieve the desired dimming effect. The LED lamp can be a direct replacement of conventional incandescent lamps in typical wiring configurations found in residential and commercial building lighting applications that use conventional dimmer switches.

主权项

1. A light-emitting diode (LED) lamp controller for a switching power converter comprising a switch coupled to a winding that supplies power to one or more LEDs, the LED lamp controller comprising:
a dimmer control circuit to detect a dimming amount of an input voltage from a dimmer switch, and to generate a dimming control signal representative of the detected dimming amount; a switch controller to receive the dimming control signal, a current sense signal representing a current through the winding coupled to the switch, and a voltage sense signal representing a reset time of the switching power converter, and to control switching of the switch based on the dimming control signal, the current sense signal, and the reset time to regulate a current through the one or more LEDs such that the one or more LEDs achieve a dimming level corresponding to the detected dimming amount.