Kuen-Der Wu, Jinn-Chang Wu, Hurng-Liahng Jou, and Wen-Chung Chen


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  13. [13] F.-S. Pai & S.-J. Huang, Design and operation of burn-in test system for three-phase uninterruptible power supplies, IEEE Transactions on Industrial Electronics, 49(1), 2002, 256–263.Figure 9. Experimental results for phase a under step resistor load, (a) utility voltage, (b) utility current, (c) the load current of tested equipment, and (d) energy regeneration power converter current.power of the tested equipment is 2.3 VA. The experimental results show that the utility only supplies a small real power to overcome the power loss of the tested equipment and active load, and most power used for burn-in test is recycled. From Figs 4–8, it can be found that the proposed active load can be operated not only as a linear load but also as a nonlinear load. Figure 9 shows the experimental results for the active load under the transient of step load. As can be seen, the transient duration is less than half cycle. This shows that the proposed active load has good transient response. 6. Conclusions The loads used in the burn-in test for power electronicrelated equipment may be a resistive, a resistive/capacitive, a resistive/inductive and a rectifier load. The burn-in test will result in a significant power loss and increase the manufacturing cost especially for mass production. To avoid the above problems, an active load capable of energy 174

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