Isolated Full-Bridge DC-DC Converter Using Parallel Switches and Interleaved PWM for Electrolyzers in Green Hydrogen Production

This paper presents a study of an isolated fullbridge interleaved DC-DC converter with parallel switches and interleaved PWM, designed for water electrolyzers in green hydrogen production. The topology improves semiconductor loss distribution and reduces the volume and weight of passive components. It achieves high power density and low current ripple, with a ripple frequency four times the switching frequency, ensures galvanic isolation, provides high DC voltage gain based on the transformer turns ratio and duty cycle, and simplifies system design. Experimental tests were conducted with a DC bus voltage$V_{d c}=380 \mathrm{V}$, electrolyzer voltage$\mathrm{V}_{\text{el}}=180 \mathrm{V}$, and a converter rated power of 2 kW. Results demonstrate that the converter is suitable for applications requiring a compact size and reliable operation under the dynamic conditions of renewable-energy-powered hydrogen production.