A Novel Type of High Gain DC-DC Converter

With the wide application of new energy of solar and fuel cells whose output voltage is low, researches on high power and high gain converter become one of the focuses of power electronics. To obtained the high gain and high reliability of the DC-DC converter, a novel type of no-isolated passive-clamped interleaving converter based on precharged capacitance unit is proposed, in which the inputs are in series and the outputs in parallel. To test the theory analysis, a 200 W experimental equipment is built. The experimental results indicate that this passive-clamped circuit can receive leakage inductance energy effectively, zero-voltage-switched and zero-current-switched are achieved, which has the similar effectiveness of active-clamped circuit, and the reliability of this device is improved. By using of this new converter, high gain is obtained in the context of suitable duty ratio, transformer turns-ratio is reduced and reverse recovery is restrained, the efficiency is improved, the power density is also improved, and the size of magnetic cores is reduced effectively. So, it is proved that this new converter is novel and practical.