A ZVZCS three-phase boost dc-dc converter distributing 400VDC in Telco and data centers to improve energy efficiency

This paper proposes voltage-fed dc-dc converter for high-voltage distribution in telecommunication (Telco) and data centres. The conventional voltage-fed dc-dc converter has large transformer leakage inductance owing to high transformer turn ratio. The transformer turn ratio is reduced to half by using Δ-Y connection. The proposed converter has the following advantages: It clamps the surge voltage; reduces the circulation current flowing in the primary side; conduction losses are minimized; reduces transformer copper losses; and zero-voltage and zero-current switching (ZVZCS) for all switches can be achieved over wide load range by applying ZCS turn-on and ZVS turn-OFF at upper switches and ZVS turn-ON and ZCS turn-OFF at lower switches. It is a three-phase voltage-fed converter so that MOSFETs with lower rating can be selected as a result the largest duty cycle loss can also be reduced by the clamp switch. The proposed circuit produces 400V_dc which provides the highest efficiency, cost effective solution to powering the data centres.