Patent ID: 8736178
Filing Date: 2014-05-27
Classification: H02M,H05B

Abstract:
1. An LED lighting apparatus comprising: a rectifier to rectify an AC voltage so that the AC voltage is converted into a DC rectified voltage; a load including a plurality of LED blocks connected to each other in series; a switch block including switches to by-pass currents flowing through the LED blocks; a current source to adjust a current supplied to the LED block; a controller to calculate a design current value based on the AC voltage, regulate current flow of the load by controlling the switch block according to the design current value, and restrict an amount of currents flowing through the load by controlling the current source according to the design current value; a power supplying condenser to supply charged power to the controller; a starting circuit to charge the condenser if the rectifier starts to supply power; and a load current recycling circuit to charge the condenser with a surplus voltage in such a manner that the controller is operated based on the surplus voltage remaining after the load uses the rectified voltage supplied thereto from the rectifier through a control of the controller for the switch block and the current source according to the design current value, wherein the load current recycling circuit includes a load-side diode connected in series between the power supplying condenser and the load and a load-side switch connected between an anode of the load-side diode and a grounding terminal.