A High Voltage Gain Improved Cuk Converter with Continuous Input Current

High gain DC-DC converters are increasingly being used in solar PV and other renewable generation systems. Satisfactory steady-state and dynamic performance, along with higher voltage gain, are pre-requirements for selecting the converter for these applications. For this reason, an improved Cuk converter is proposed. Firstly, the circuit topology and the working principle of the new converter are described in detail. Then, the voltage stress of power switch and diode is discussed, and its circuit parameters are designed. On this basis, the proposed converter is compared with other similar converters in ideal voltage gain. Finally, the system simulation model is established by Matlab, and the experimental prototype is developed. The simulation and experimental results verify the correctness of the theoretical analysis. The circuit structure of the proposed converter is simple, with continuous input and output currents, the ripple of the input current is relatively low, and the continuous output current reduces the current stress on the capacitance at the load end. In addition, the output voltage ripple of the converter is small, and the voltage stress between the switch and the diode is very small. Continuous input current is an ideal characteristic of DC-DC converter, which makes it very suitable for solar photovoltaic applications.