Novel on-line maximum duty point tracking technique to improving server power efficiency meeting 80plus Gold code

The main theme of this paper is to propose a novel on-line maximum duty point tracking technique to improve the efficiency of the server power. The server power consists of PFC and phase-shift full-bridge converter. The proposed MDPT technique controls the DC-link bus voltage of power factor corrector (PFC) to retain maximum duty ratio of phase-shift full-bridge converter. It will be shown that the efficiency can therefore be improved significantly and meet the 80 plus Gold code. Experimental system using TI DSP (TMS320F2812) as the control platform has been set up. The specifications of the server power supply include: AC input voltage = 110 / 220 V, DC output voltage = 12 V and output power = 480W. Experimental results show that the efficiency can be improved from light load to full load conditions. It will be shown that the efficiency can therefore be improved up to 2.3% to meet the 80 PLUS Gold code. These results confirm the effectiveness of the proposed maximum duty point tracking technique.