A High Voltage Gain Improved Cuk Converter with Continuous Input Current

doi:10.11985/2023.04.015

Abstract

Abstract:

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.

Key words: Improved Cuk converter, high voltage gain, single switch, continuous current

CLC Number:

TM464

YUE Zhou, LIU Xiaodi, YAO Shaohua, YANG Jialin. A High Voltage Gain Improved Cuk Converter with Continuous Input Current[J]. Journal of Electrical Engineering, 2023, 18(4): 134-142.

Figures/Tables 12

References 20

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变换器	开关数量	电感数量	电容数量	二极管数量	理想电压增益
Buck-Boost	1	1	1	1	D/(1-D)
Cuk	1	2	1	1	D/(1-D)
Sepic	1	2	2	1	D/(1-D)
Zeta	1	2	2	1	D/(1-D)
文献[10]	1	3	4	2	2D/(1-D)
文献[11]	1	3	4	2	2D/(1-D)
文献[16]	1	3	3	5	D²/(1-D)²
本文所提	1	3	4	2	2D/(1-D)

参数	数值
输入电压/V	25
开关频率/kHz	40
输出负载/Ω	31
电感L₁/μH	1 000
电感L₂、L₃/μH	800
电容C₁/μF	47
电容C₂、C₃/μF	100
电容C_o/μF	68
升压模式占空比	0.6
降压模式占空比	0.25