Design of interleaved Boost converter in energyfeedback electronic power load

 ZHAO Guoqiang，MA Hao
（Department of Electrical Engineering， Zhejiang University， Hangzhou 310027， China）

Abstract：In order to satisfy the requirements of low voltage and large current， low input current ripple， and high efficiency in energyfeedback electronic load for server power supply test， an interleaved Boost converter was employed in first stage DC/DC. The operation principle of the circuit was analyzed and the selecting method of main components was presented. In accordance with the demand of constant input current in electronic load， design of constant current control loop based on dsPIC33FJ16GS504 was introduced. Accurate set of input current was achieved by means of highspeed calculation with DSP. Finally a 12 kW prototype was built with input 12 V/100 A and output 48 V. The results validate the feasibility of the proposed converter with input of lowvoltage and largecurrent， show that the circuit can work in stable state and meet the requirements of energy feedback electronic load system.
Key words：server power supply；interleaved；energyfeedback electronic load