Abstract: A light-emitting-diode (LED) protection circuit, comprising: a light-emitting-diode module; two fuse elements, connected respectively to said LED module; and a discharge protection element, connected to said LED module and said two fuse elements. When current flowing through said fuse element exceeds a current protection value, said fuse element will turn into an open circuit state, to cut off an over current and prevent it from flowing to said LED module to avoid damages. In addition, when instantaneous high voltage occurs, such as incurred by a spike or a lightning, said discharge protection element can be used as an over current discharge route, to provide said LED module with a current bypass route.

Abstract: A light adjusting circuit, it provide power required for an overall operation of light adjusting circuit, and it utilizes a light adjusting controller to perform light adjusting of load. During light adjusting, in case operating voltage of a driving controller is equal to or greater than a threshold value, then a rectifier or a power controller provides a first power supply to driving controller through an AC voltage adjusted by light adjusting controller, so that it can regulate a driving voltage through power controller based on DC voltage variation, to drive a load. Otherwise, in case operating voltage of driving controller is less than threshold value, it is switched to a battery to provide a second power supply to driving controller, to make it have stable operating voltage, control power controller to output driving voltage to load, to eliminate blinking of load when conduction angle is small.

Abstract: A light-emitting-diode (LED) protection circuit, comprising: a light-emitting-diode module; two fuse elements, connected respectively to said LED module; and a discharge protection element, connected to said LED module and said two fuse elements. When current flowing through said fuse element exceeds a current protection value, said fuse element will turn into an open circuit state, to cut off an over current and prevent it from flowing to said LED module to avoid damages. In addition, when instantaneous high voltage occurs, such as incurred by a spike or a lightning, said discharge protection element can be used as an over current discharge route, to provide said LED module with a current bypass route.