Patent ID: 7256553

Claim:
A lamp driving system controlled by electrical isolation, comprising: a power factor correction controller, for receiving an AC power and outputting a high voltage; a switching circuit, coupled to said power factor correction controller, for receiving said high voltage and outputting a lamp driving voltage; a boost transformer, having a primary side and a secondary side, and the primary side of said boost transformer being coupled to said switching circuit and provided for receiving said lamp driving voltage; a loading resonant network, coupled to the secondary side of said boost transformer and provided for producing a feedback signal; an electrical isolator, having a primary side and a secondary side, and the primary side of said electrical isolator being coupled to said switching circuit, and the primary side of said electrical isolator being coupled to said power factor correction controller, and both primary sides of said switching circuit and said boost transformer being coupled to a primary ground end; and a PWM controller, coupled to the secondary side of said electrical isolator and said loading resonant network, and provided for receiving said feedback signal and outputting a control signal and sending said control signal to said switching circuit through said electrical isolator, and said PWM controller, said loading resonant network, the secondary side of said electrical isolator and the secondary side of said boost transformer being coupled jointly to a secondary ground end.