Patent ID: 8159838

Claim:
A flyback converter system capable of preventing two side switches from being turned on simultaneously, the flyback converter system comprising: a power supply module comprising: a voltage regulator for maintaining a voltage inputted to the power supply module; a primary side of the flyback converter system coupled to the voltage regulator; and a primary side switch coupled between the voltage regulator and the primary side of the flyback converter system for controlling a magnetic flux direction of the primary side of the flyback converter system; and a power receiving module comprising: a secondary side of the flyback converter system for receiving power from the primary side of the flyback converter system; a secondary side switch coupled to the secondary side of the flyback converter system; and a controller comprising: a switch on module for turning on the secondary side switch; a switch off module for turning off the secondary side switch, the switch off module comprising: a first switch off sub-module for turning off the secondary side switch according to an impedance of a load coupled to the power receiving module; a second switch off sub-module for turning off the secondary side switch according to a period of the secondary side switch; and an OR gate coupled to the first switch off sub-module and the second switch off sub-module for turning off the secondary side switch according to an output signal of the first switch off sub-module and an output signal of the second switch off sub-module; and a flip-flop coupled to the switch on module and the OR gate for controlling on and off states of the secondary side switch according to an output signal of the switch on module and an output signal of the switch off module.