Research on digital controlled converter for AC power electronics burn-in test with Energy Feedback

It is necessary to do burn-in test for many power electric products. Compared to conventional resistor method whose consumption is generally huge, equipments with power recycling function in burn-in test are recognized as more thrifty-not only reduce energy loss but also save manufacturing cost. This paper presents a digital controlled converter for AC power electronics burn-in test with energy feedback, which contains the load characteristic simulation part (LCSP) and the energy feedback part (EFP). The main topology is an AC/DC/AC structure comprised of two PWM voltage source rectifiers (VSR). SPWM current-mode control technique based on TMS320F2812 is adopted to make the circuit operate at a constant frequency. Simulation results indicate that the digital controlled converter can perform as all kinds of loads and feed energy back to the utility system with unit power factor.