Interleaved high step‐up DC–DC converter based on three‐winding high‐frequency coupled inductor and voltage multiplier cell

Abstract

This study presents an interleaved high step-up DC-DC converter based on three-winding high-frequency coupled inductor and voltage multiplier cell (VMC) techniques. The primary and secondary windings of each coupled inductor are inserted in the same phase and the third winding is inserted in the other phase. The VMC in each phase consists of two diodes, two capacitors, the secondary winding of the same phase coupled inductor and the third winding of the other phase coupled inductor. The voltage gain is increased and the output voltage is clamped across the capacitors of the VMCs. Then, the voltage across the power metal oxide semiconductor field effect transistors (MOSFETs) is decreased. The leakage inductance of the coupled inductors controls the output diode falling rate, which alleviates reverse recovery problems. The power MOSFETs are turned-on under zero current switching that helps to conversion efficiency improvement. Three modes of operation named as continuous conduction mode, discontinuous conduction mode and boundary conduction mode are investigated for the proposed converter. The carried mathematical analysis and satisfying operation of the proposed converter are verified via experimental results of an 870 W 60 V-input to 590 V-output laboratory prototype with 95.2% conversion efficiency.

Interleaved High Step-Up DC-DC Converter Based on Voltage Multiplier Cell and Voltage-Stacking Techniques for Renewable Energy Applications

“…Moreover, the voltage stress on the switches and the highest voltage stress on diodes of the proposed converter are the lowest among the compared converters. The component number of the proposed converter is less than that of the converter published in [21]. Clearly, the proposed converter is suitable for the high step-up and high voltage applications.…”

“…The performance comparison between the converters published in [20][21][22] and the proposed converter is shown in Table 1. The relationship between the voltage gain and the duty ratio in these converters with the turns ratio n = 1.5 is shown in Figure 7.…”

“…The experimental results shown in the Figures 8-15 are measured under full-load conditions 1000 W. [20] and [22] Converter in [21] Proposed converter …”

“…In the literature, a lot of converter topologies have been proposed to obtain high step-up voltage gain [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. For coupled inductor-based converters [6][7][8][9][10], the high voltage gain can be achieved by adjusting the turns ratio of the coupled inductor and duty ratio.…”

“…Several kinds of interleaved high step-up converters with voltage multiplier cells have been proposed in [15][16][17][18][19]. The interleaved converters with three-winding coupled inductors are proposed to achieve high voltage conversion ratio and low input current ripple [20][21][22]. However, they are a little complex and difficult to design, which results in the circuit complexity and cost problems.…”