A Simple Current Mode Controller for Two Switches Buck-Boost Converter for Fuel Cells

Due to the internal losses of fuel cells, its load regulation is not better than 30% from the no load to full load conditions. To increase the utilization of full cell, this paper proposed a two switch buck-boost converter with a simple current mode controller. This structure performs conversion with lower stresses than the single switch types. In this approach problem of interference between buck and boost switches performance are solved by determining four operation modes for the converter. The experimental results of an 110 V, 40 KW converter show the ability of the control method. The line and load regulation in different situation is below than 0.9%.