A Zero-Voltage transition full bridge DC-DC converter for photovoltaic applications

摘要

The paper focuses on a high efficiency Zero Voltage Transition (ZVT) DC-DC full-bridge converter using a high-frequency transformer. A novel structure with recovery of energy on load side is proposed. Such solution is particularly suitable for photovoltaic applications which require low losses and cannot recovery energy on source side. Moreover, a suitable architecture of snubber circuit that permits to improve significantly the efficiency is discussed. Analysis of its operating modes and a comparison of the conversion efficiencies with conventional ZVT-PWM converters are given. Design example of a 750 W 100 kHz DC-DC converter and different PSPICE simulation tests are provided.