Efficiency optimization method and accurate power loss evaluation method of 48 V/12 V resonant DC–DC converter

Abstract

With the rapid development of artificial intelligence, the rack load power is constantly increasing. The 48 V/12 V converter which is suitable for the two-stage step-down structure of 48 V distribution system has received much attention. In this paper, the efficiency optimization scheme for 48 V/12 V three-phase resonant switched-capacitor-converter is proposed. The component selection method is considered under light load and heavy load conditions. An accurate loss model is also proposed for the converter, and the model is accurate. Parameter design process is given and three experiments are designed to verify the correctness of the optimization method. The highest power convert efficiency (PCE) achieved by the 48 V/12 V experimental prototype with the maximum load power of 144 W is 98.97%.

Keywords

• 48 V distribution system
• Resonant switched-capacitor-converter
• Two-stage step-down structure
• Exact loss model
• High PCE