A three level double-ended flyback converter

A new four-switch converter topology is presented. This topology is intended for use in high input voltages and low power applications, especially auxiliary supplies. It´s mainly advantage is the clamping voltage on the switches: half of the input voltage. It works like the flyback converter, with one direction power flow. The four switches can be set on with the same pulse, with a small delay time in the off signal of the internal switches after the external ones. The reliability of the converter is increased with the series position of the switches with load. This reliability combined with simplicity of the way it is commanded, makes this converter very well suited for small power applications. This paper presents the principle of operation of the proposed converter. Each stage with the main characteristics, and the main equations are also presented. Experimental data prove the suitability of the proposed converter.