An interleaved buck-boost converter for high efficient power conversion

In many applications, an efficient DC - DC converters are required as an interface between the available low voltage sources and the output loads, which are operated at much higher voltages. It is a major challenge to operate the conventional boost converters at high efficiency because it requires an extreme duty ratio to meet the high-voltage step-up requirements. Under such conditions, problems like high ON-state resistance, diode reverse recovery problem, increased conduction losses, degrade of efficiency, and voltage stresses will occur. In high current or high power applications, interleaving of buck and boost converters are well established.

Moreover, the active clamp circuit can successfully reduce the
voltage stress of the switches and it collects the leakage energies from all the coupled-inductor boost converters and recycles the leakage energies to the output. In the viewpoint of improved performance and better choice of design, it can be proposed to interleave the coupled-inductor buck boost converter with common active clamp circuit to process high power, and to achieve high efficiency and high reliability. The proposed converter avoids the disadvantage of series conduction loss of the total power. Detailed analysis and design of the proposed converter are carried out. MATLAB software was used for simulation and verification of the proposed circuit. Simulation results of the proposed converter are presented.