Quadratic high gain boost converter for grid-tie PV system application

Coupled‐inductor‐based high‐gain converter utilising magnetising inductance to achieve soft‐switching with low voltage stress on devices

“…Reduction in voltage stress helps in selection of MOSFET with lower value of R ds,on , which is more efficient due to its reduced losses. Similarly, voltage stress on output diodes are within safe operating region for all turns ratio, which is not the case for converters reported in [24, 27].…”

“…31/9/2011-12/ST and CEERI, Pilani for equipment support. [26] Converter in [24] Converter in [5] Converter in [25] Converter in [27] Proposed converter…”

“…To achieve the same boost factor, other converters need higher duty ratio as well as more turns ratio in the coupled inductor. For example, converter in [25] needs 0.56 duty ratio and converter in [24, 26, 27] requires more than 0.6 duty ratio to achieve the same gain as of the proposed converter which is operating at a duty ratio of <0.5. Additionally, the proposed converter requires less turns ratio as compared to existing converters, reducing the leakage inductance and hence the losses.…”

“…Converters in [24, 26] are single‐stage converters with less number of components showing higher efficiency. Converters reported in [24, 25, 27] are quadratic boost converters with higher components and lower efficiency. Converters in [5, 25] are having better efficiency due to lower value of R ds,on (11 mΩ) of MOSFET.…”

“…Converters in [5, 25] are having better efficiency due to lower value of R ds,on (11 mΩ) of MOSFET. Converter reported in [27] and the proposed converter have same number of components and both are soft‐switched. The proposed converter has lower voltage stress and higher efficiency, justifying the design of laboratory prototype.…”