Dimmable driver circuits for light emitting diodes

摘要

A circuit for dimming a light emitting diode is provided. The circuit includes an alternating current input voltage that is delivered to a light emitting diode. The circuit also includes a correction circuit configured to monitor the input voltage, which also delivers a current to the light emitting diode, wherein the current delivered to the light emitting diode is commensurate with the input voltage. The circuit also includes a simulation circuit electrically coupled to the correction circuit and configured to deliver an additional voltage to the correction circuit to modify a setpoint voltage when the input voltage falls below a predetermined value.

主权项

1. A dimmable driver circuit for a light emitting diode (LED), comprising:
a comparator circuit configured to:
compare an input value representing an input voltage to an output value representing a current flowing through the LED; andprovide an indication of the output value relative to the input value; and a compensation circuit configured to:
monitor the current delivered to the LED and the output of the comparator circuit; andmodify the current being delivered to the LED in response to the indication.