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In this paper, a highly compact, low power (<10W), high frequency (2 MHz)isolated active clamp forward converter, comprising a coreless Printed CircuitBoard-based transformer is proposed. To decrease the size of converter, highswitching frequency is considered which lead to decrease in inductor, capacitorand transformer size. Highly switch loss due to hard switching is an importantconstraint of forward topology to increase frequency. In this paper, the activeclamp circuit is added to forward topology to achieve zero voltage switchingand decrease switching loss drastically. Due to zero voltage switching, theproposed converter can operate in high frequency. The principle of active clampforward converter is described in this paper. Another constraint to increasethe switching frequency of forward converter is transformer core losses. Inthis paper, coreless PCB-based transformer is proposed and implemented to beutilized in the structure of the active clamp forward converter. Instead ofclassic core-based transformer, using a PCB-based transformer as the powertransmitter has increased the efficiency due to elimination of core hysteresisloss. The equivalent circuit, transfer function and input impedance ofPCB-based coreless transformer are presented in high frequency. Finally, anexperimental prototype of the active clamp forward converter which uses acoreless transformer is implemented. The experimental results of proposedconverter are presented to evaluate the theoretical analysis and performance.

A High Frequency Active Clamp Forward Converter with Coreless Transformer