Patent ID: 9516723
Filing Date: 2016-12-06
CPC Classification: H05B

Claim Text:
1. A system for driving light emitting diodes (LED), the system comprising: an alternating current (AC) driven LED unit, the AC driven LED unit comprising a first LED and a second LED, the first LED and the second LED being coupled in reverse parallel; an alternating current voltage regulator coupled between an AC voltage source and the AC driven LED unit; and a controller coupled to the AC voltage regulator, the controller configured to monitor AC voltage fluctuations of the AC voltage source and a regulated AC voltage supplied to the AC driven LED unit, and transmit control signals to the AC voltage regulator according to a monitored result, wherein the AC voltage regulator is operable to receive an AC voltage originating from the AC voltage source, and the AC voltage regulator is operable to regulate the AC voltage from the AC voltage source in response to the control signals transmitted from the controller, and to apply the regulated AC voltage to the AC driven LED unit, allowing the first LED and the second LED to emit light according to the regulated AC voltage; the controller is configured to monitor the AC voltage source for voltage fluctuation of the AC voltage from the AC voltage source and generate a first control signal to control the AC voltage regulator to maintain the regulated AC voltage from the AC voltage regulator supplied to the AC driven LED unit at a predetermined level; and the controller is configured to monitor the AC driven LED unit to monitor a voltage fluctuation of the regulated AC voltage from the AC voltage regulator and generate a second control signal to control the AC voltage regulator to maintain the regulated AC voltage at the predetermined level.