Non-Cascading Structure based Bi-Quadratic Step- Down Converter: Analysis and Design

In the present paper, a step down converter employing combination of Flyback and Forward converters, using a non-cascading scheme, is presented. The voltage conversion ratio in a bi-quadratic converter depends on bi-quadratic power of the duty cycle. Due to this effect, the range of obtainable output voltages has become wider. This means the difference of any two consecutive output realizable voltages becomes narrower than that achieved by using relatively lower power of the duty cycle. Here, for stepping up the output voltage, the outputs of the flyback and forward sub-converters are combined in series with each other. Due to such configuration, a larger output voltage is obtained. A comparison is given to indicate the extension in voltage conversion ratio as the duty cycle is raised to higher power. For validation, a converter of 24 V, 24 W rating is presented.