Patent ID: 8248827
Filing Date: 2012-08-21
Classification: H02M

Abstract:
1. A discontinuous mode flyback converter, including a transformer configured to store magnetic energy using excitation current and to transfer the magnetic energy using a primary winding and a secondary winding closely coupled to the primary winding, a switching element coupled to one end of the primary winding of the transformer and configured to control current of the primary winding of the transformer, a control unit configured to control the switching element, and a voltage error feedback unit for feeding back an error of output voltage of the transformer to the control unit, thereby regulating the output voltage, said discontinuous mode flyback converter comprising: an output current feedback circuit for detecting a flyback period of the transformer, increasing a switching period of the switching element when a rate of a flyback period excesses a setting value in a cycle, and feeding back to the control unit for holding the rate of the flyback period with the setting value in a cycle.