Improved High Step-Up Boost-based DC/DC Converter with Built-In Transformer and Active Clamp for DC Microgrids

摘要

In this paper, an improved non-isolated high step-up (HSU) converter which consists of an inductor, a built-in transformer and a voltage multiplier is presented. The energy stored in the leakage inductance is recycled with the use of an active clamp circuit. The voltage stress on both power switches is also reduced, therefore, power switches with low resistance $R_{DS, on}$ can be used to reduce the conduction losses. To verify the performance of the presented converter, a 250W laboratory prototype is implemented. The results validate the proper operation and the practicability of the proposed improved high step-up converter.