Patent ID: 8330384

Claim:
A power supply unit with a dimming function, adapted for a light emitting apparatus comprising a power system, the power supply unit comprising: at least one output channel; a power stage receiving a first output of the power system and providing a first signal; a detecting unit detecting a second output of the power system and providing a second signal; and a micro controller unit (MCU) receiving the first signal and the second signal, controlling the at least one output channel, and programmed to set a dimming ratio for the at least one output channel according to the first signal and the second signal, wherein the power stage comprises: a transformer delivering an energy from a primary side to a secondary side; an output circuit coupled to the transformer and transferring a secondary side energy of the transformer to the at least one output channel; a switch unit coupled between the MCU and the transformer and controlled by the MCU to organize an output outputted to the primary side of the transformer; and an auxiliary power unit coupled to the transformer and providing a power and the first signal to the MCU.