A New ZCS high step-up converter with low auxiliary elements

Subject Areas : Renewable energy

Reza  Aliakbari ¹ (MSc – Department of Electrical Engineering, Khorasgan Branch, Islamic Azad University, Isfahan, Iran)
Majid  Delshad ² (Acociate Professor - Department of Electrical Engineering, Khorasgan Branch, Islamic Azad University, Isfahan, Iran)

Received: 2017-11-06 Accepted : 2017-12-31 Published : 2017-12-22

Keywords: ZVS, ZCS, auxiliary circuit, high step up,

Abstract :

In this paper, a new soft switching high step up converter is introduced which its auxiliary circuit does not have any extra switch. Therefore, it no needs extra driver circuit and control circuit is simple. Also the energy in auxiliary circuit transfers to the output. The auxiliary circuit provides zero current condition for turns on and zero voltage condition for turns off instants of the switch. In addition all diodes turn off under ZCS condition and reveres recovery problem don’t exist in them. One of the advantages of the proposed converter is the reduction of the voltage stress across the switch due to its high voltage gain. Also, the auxiliary circuit has a low number of elements; therefore, high conduction losses do not impose on the converter. The coupling inductors in the auxiliary circuit have low values, so the volumes and parasitic magnitudes do not increase. To verify theoretical analysis a prototype of the proposed converter is implemented.

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