Abstract In order to increase the voltage gain and efficiency of the Zeta converter and reduce the voltage stress of the switch. Combining the Buck-Boost converter with the Zeta converter and adding the coupled inductance voltage doubler structure, the coupled inductance combined Buck-Boost-Zeta converter was proposed. The converter maintains the continuous output current of the Zeta converter while increasing the voltage gain. The diode-capacitor branch of the converter was used as a passive clamp to absorb the leakage inductance energy, which effectively suppresses the voltage spike generated by the switching transistor parasitic capacitance and leakage inductance resonance. The voltage gain and efficiency of the converter are further improved, and the voltage stress of the switching tube was reduced. The working principle of the converter working in CCM and DCM operation was analyzed, and the performance parameters were given. Compared the performance of the converters mentioned in this paper with the performance of other coupled inductor Zeta converters. The extended structure of the converter was given. Finally, the correctness of the theoretical analysis was proved by making a 150W experimental prototype for experiment.
Received: 25 September 2019
Published: 24 July 2020