High Density Cascaded ZVS Switched Capacitor Converter for 48-V Data-Center Application

Abstract:
This paper presents a new intermediate bus converter topology based on a zero voltage switching switched capacitor circuit including a novel non-isolated gate driver ICs enabling high power density in 48-V data center applications. The proposed topology inherently ensure zero voltage switching operation enabling high switching frequency keeping high efficiency. The novel non-isolated driver IC, with truly differential input, works also as floating high side driver, which lead to a driver circuit footprint reduction by 75% compared to an equivalent dual isolated driver IC. Experimental results show the effectiveness of the proposed approach, the prototype achieves 3060 W/in³ power density and a peak efficiency of 97.13% at 48-V input voltage including auxiliary losses.