Combined isolated forward-flyback-converter with only one diode as battery charger

Converters are very important, especially for power supplies, battery chargers and for coupling DC networks. The well-known classical forward converter needs three windings. Two are used to transform the energy and the third one is necessary to demagnetize the core. The new combined forward-flyback-converter needs only two windings and one diode. The transformer is therefore easier to manufacture, is smaller, has lower weight and is therefore cheaper. In this paper the new forward-flyback-converter which enables us to control the voltage across the output is analyzed. The weighted state differential equations are linearized in order to use the possibilities of the linear control theory. A basic analysis of the converter topology is given. In addition some experimental results are presented.