Bidirectional quadratic converter for wide voltage conversion ratio

In this paper, a non-isolated bidirectional quadratic converter is proposed for wide conversion ratio. This proposed converter work as a quadratic boost converter as well as a quadratic buck converter in the same single converter. Due to its broad conversion range in both ways, it can be easily suitable for the applications like UPS, HEV, battery charging, etc. For high conversion ratio, converter needs to operate at an extreme duty cycle to achieve the highest possible gain. This activity leads to severe reverse recovery of the diodes, increases EMI, increase losses and decrease efficiency. For low conversion ratio, converter needs to operate at a low duty cycle to achieve the lowest possible gain but minimum turn on time is limited. The proposed bidirectional quadratic converter capable of providing wide voltage conversions ratio without operating extreme high or extreme low duty cycle. The steady state analysis and small signal modeling are carried out. Finally, a prototype circuit is implemented to verify the performance of the proposed bidirectional quadratic converter.