Patent ID: 7835163

Claim:
A power converter with a secondary-side control, including an input circuit with at least one switch; a transformer with a primary-side coil assembly and a secondary-side coil assembly, wherein said primary-side coil assembly connects to said switch, and voltage variations of said primary-side coil assembly regulates the on/off states of said switch; an output circuit with an output end, including a controller; and a rectifier diode with two ends, wherein said output circuit connects to said secondary-side coil assembly of said transformer for input energy in said input circuit to go through said transformer and then transfer to said output circuit to generate an output voltage, said controller detects and react to said output voltage by making said primary-side coil assembly to control said switch in a PWM or PFM action, and said controller further includes two control ends, a 1st and a 2nd control end, each connected to one of said two ends of said rectifier diode, wherein said controller determines three different states in circuit configurations between said two control ends, including a resistor load connection, a short circuit, and an open circuit.