Kuen-Der Wu, Jinn-Chang Wu, Hurng-Liahng Jou, and Wen-Chung Chen
[1] C.E. Harm, Real world application of burn-in to improve product quality, 13th International Telecommunications Energy Conference, INTELEC ’91, 5–8 November, Incheon, Korea, 1991, 560–565. [2] S. Gupta, V. Rangaswamy, & R. Ruth, Load bank elimination for UPS testing (Industry Applications Society Annual Meeting ) Conference Record of the 1990 IEEE 7–2 October 2, Seattle, WA, USA, 1990, 1040–1043. [3] J.F. Chen, C.L. Chu, & C.L. Huang, A study on the test of UPS by energy feedback method, IEEE International Symposium on Circuits and Systems, 11–14 June, 1991, 5, Singapore, 3015–3018. [4] T.-H. Ai, J.F. Chen, C.L. Chu, & C.L. Huang, The burn-in test of three-phase UPS by energy feedback method, 24th Annual IEEE Power Electronics Specialists Conference, PESC ’93 Record, 20–24 June, Seattle, WA, USA, 1993, 766–771. [5] J.F. Chen & C.L. Chu, Self-load bank for UPS testing by circulating current method, IEE Proceedings of Electric Power Applications, 141(4), 1994, 191–196. [6] T.J. Cheng, C. Tsai, & M.T. Tsai, High-efficiency energy recycling system for AC power source burn-in test, Proceedings of the IEEE 1999 International Conference on Power Electronics and Drive Systems PEDS ’99, Hong Kong, 1999, 1, 291–296. [7] M.T. Tsai, Comparative investigation of the energy recycler for power electronics burn-in test, IEE Proceedings of Electric Power Applications, 47(3), 2000, 192–198. [8] M.-T. Tsai & C. Tsai, Energy recycling for electrical AC power source burn-in test, IEEE Transactions on Industrial Electronics, 47(4), 2000, 974–976. [9] C.A. Ayres & I. Barbi, Power recycler DC power supplies burnin test: Design and experimentation, Eleventh Annual Applied Power Electronics Conference and Exposition, APEC’96, Conference Proceedings 1996, 3–7 March, San Jose, CA, USA, Fairmont Hotel, 1996, 1, 72–78. [10] C.A. Ayres & I. Barbi, CCM operation analysis of a family of converters for power recycling during the burn-in test of synchronized UPS’s, 27th Annual IEEE Power Electronics Specialists Conference, PESC ’96 Record, 23–27 June, Baveno, Italy, 1996, 2, 986–992. [11] C.A. Ayres & I. Barbi, A family of converters for UPS production burn-in energy recovery, IEEE Transactions on Power Electronics, 12(4), 1997, 615–622. [12] F.-S. Pai & S.-J. Huang, A new approach of circulating method for UPS testing with energy recovery, 2002 IEEE Power Engineering Society Summer Meeting, Chicago, IL, USA, 2002, 3, 1418–1422. [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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