20140028206 | APPARATUS FOR CONTROLLING LED STRING - An apparatus for controlling an LED string is provided, in Which each high voltage (HV) N-type device has one end electrically connected or coupled with the corresponding LED unit and the other end coupled with a corresponding low voltage (LV) current limit switch via a corresponding path. The LV current limit switch is switched according to the voltage or current detected on the path. Since the current flowing through the HV N-type device increases or decreases with that flowing through the corresponding LV current limit switch, the HV N-type device will be indirectly controlled. | 01-30-2014 |