Patent ID: 7054170

Claim:
A power-mode controlled power converter, comprising: a transformer, having a secondary winding, a primary winding and an auxiliary winding, wherein said secondary winding of said transformer is connected to a secondary-side circuit of the power-mode controlled power converter and said auxiliary winding of said transformer is connected to a primary-side circuit of the power-mode controlled power converter; a power transistor, for energy switching, wherein said power transistor is connected in series with said transformer; an output rectifier and an output capacitor; an auxiliary rectifier; and a PWM controller, wherein said PWM controller has a voltage-loop control circuitry coupling to the auxiliary rectifier for generating a voltage-reset signal, a current-loop control circuitry coupling to the power transistor for generating a current-reset signal, a first switch, a second switch, and a circuit for performing pulse width modulation which is started up under control of the first switch and the second switch, to achieve a constant output voltage and a constant output current regulation.