Analysis of voltage stress on a coupled inductor-based high gain boost DC-DC converter with light load condition

摘要

In this paper, voltage stress of a coupled inductor-based high gain boost DC-DC converter is established under light load condition. During this condition, reverse recovery occurs on the switches of the converter enabling resonance condition on the parasitic elements of the devices. Due to this, a large voltage stress appears on the switching devices. However, appropriate snubber design can save the devices from the attack of this voltage stress. To attain a proper snubber design, a complete realisation of the parasitic elements has to be suitably evaluated through a complex and tedious analysis. However, an indirect method using maximum voltage stress analysis can also be a suitable alternative for proper snubber design. A detailed study in this regard with respect to steady state analysis, voltage stress formulations with a variation of load condition etc. are the key aspects of this work. Validation of this study is carried out with a laboratory prototype of 50 W capacity.