High-voltage gain DC-DC converters are widely used in renewable energy systems, and problems such as large input current ripple, high switching tube voltage stress, and low voltage gain are urgently needed to be solved in this type of DC-DC converters. In this paper, a zero-input current ripple scalable high-gain DC-DC converter based on magnetic integration is proposed. The converter combines the magnetic integration technology with the coupled inductor ripple suppression technology, using only one magnetic core element, which can eliminate the input current ripple and obtain high voltage gain, and can form a series of expansion units to further enhance the voltage gain and reduce the voltage stress of the switching devices. In the paper, the operating principle, steady state performance, gain expansion, magnetic integration principle and conditions for realizing the zero input current ripple characteristics of the converter are analyzed in detail. In order to verify the feasibility of the proposed converter theory, a 140 W, 24 V/400 V experimental prototype is built, and the experimental results are basically consistent with the theoretical analysis.
Key words
DC-DC converter /
gain regulation /
photovoltaic power /
zero ripple /
magnetic integration /
expandable units
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