A high step-up double-dual-boost converter with continuous output current

• A new Double-Dual-Boost converter that offers continuous current in the output • The converter offers higher voltage-gain in comparison with conventional DDB converters • The converter offers the advantages of the DDB and interleaved converters Although recently proposed double-dual-boost (DDB) DC-DC converters can be used in various applications, they are unable to achieve a higher voltage gain than the conventional DDB converter and typically suffer from a discontinuous output current. This paper presents a non-isolated DDB converter specifically designed to address these limitations, offering continuous output current and high step-up voltage gain. The proposed converter retains the advantages of the conventional DDB converter while employing only two active devices. Moreover, it features low input current ripple, continuous input and output currents, and a voltage gain equal to the combined gains of a quadratic boost converter and a quadratic buck-boost converter. Maintaining non-pulsating input and output currents reduces the risk of damaging renewable energy sources connected to the converter. Therefore, the proposed converter is a suitable option for fuel cell and photovoltaic applications. To demonstrate the benefits of the proposed converter in terms of current continuity, current ripple, the number of active devices, and voltage gain, a detailed comparison with existing DDB converters is provided. Finally, an experimental prototype of the proposed converter is built to validate its performance.