Ultra high step-down converter

In this paper, An ultra high step-down converter is presented, which combines one coupling inductor and one energy-transferring capacitor. Therefore, the corresponding voltage conversion ratio can be much lower than that of the traditional buck converter. As compared with the traditional buck converter, there are two key merits in the proposed converter. One demerit is that the voltage conversion ratio of this converter does not have nonlinearity characteristics, and the other is that if one switch fails or is abnormally controlled, and at the same time any other switch is made turned on, then the high voltage does not appear in the output terminal, so the output load can be protected. In this study, brief theoretical deductions and some experimental results are given to verify the feasibility and effectiveness of the proposed converter.