Abstract: A control circuit for a power converter which includes a power transformer having a primary transformer winding for receiving an input voltage signal and a secondary transformer winding for generating an output signal provides control of the on and off time of the power transformer by utilizing a control transformer having a plurality of windings. A switch is provided which is coupled to the control transformer. The switch is conductive to render the power transformer on and when non-conducting renders the powder transformer off. Activacation of the switch is controlled through magnetic coupling between the windings of the control transformer to thereby render the output voltage of the power transformer constant while the switch on time remains constant and the switch off time is variable.

Abstract: An integrated magnetic power converter for supplying power to a load includes a continuous magnetic structure having first and second legs and a magnetic path therebetween. A primary winding is wound on the first leg. A first secondary winding is wound on the second leg and is connected to the load. A second secondary winding in series with the first secondary winding is wound on the first leg. A first circuit is connected to the primary winding for supplying energy to the power converter. A second circuit is connected to the secondary windings, and a third circuit is connected to the secondary windings for alternatively transferring energy to the load. When energy is supplied to the primary winding, a magnetic flux is produced in the magnetic path for transferring energy to the load via the first secondary winding and the third circuit, and an amount of energy is stored in the area surrounding the magnetic structure and the magnetic path.