1. A system for controlling one or more light emitting diodes, the system comprising:a dimmer detector configured to:
determine that a rectified voltage is associated with a TRIAC dimmer if a first time duration for the rectified voltage to increase from a first voltage to a second voltage is smaller than a first predetermined duration or a second time duration for the rectified voltage to decrease from the second voltage to the first voltage is smaller than a second predetermined duration;
generate a control signal to turn on a bleeder if the rectified voltage is determined to be associated with a TRIAC dimmer so that the bleeder generates a current, the current being larger than zero in magnitude; and
generate the control signal to turn off the bleeder if the rectified voltage is determined not to be associated with any TRIAC dimmer so that the bleeder does not generate the current.