High-efficiency energy recycling system for AC power source burn-in test

This paper presents a feasible method for AC power source burn-in test. The proposed architecture consists of two power stages, the AC/DC converter and the DC/AC inverter, where the former imitates the load characteristic and the latter sends back the recycling energy to the utility. Both two stages are regulated by conventional pulse width modulation (PWM) and operated in current-mode control. It consumes a less amount of energy than conventional method and provides extra flexibility for the test load. In addition, it can also correct the utility current which is rich in high harmonic distortion. To implement the proposed idea, a simple control strategy and system design are presented in this paper. Case study for AC motor driver is demonstrated by means of prototype experiment to prove its performance and effectiveness.