Tham khảo tài liệu 'energy storage in the emerging era of smart grids part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 198 Energy storage in the Emerging Era of Smart Grids The analyses of current bi-direction dc-to de converter for low power application namely for telecommunication system use the concept of C k isolated bi-directional converter with integrated magnetics. Aboulnaga Emadi 2004 . The converters provide high efficiency low noise and low EMI. In addition the converter features high power density low cost for low power and electric isolation. These are achieved mainly by integration of magnetic components input and ouput inductor . The is dated bi-directional C k dc-to-dc converter is shown in Fig. 22a. A bi-directional Flyback converter concept is shown in Fig. 22b. Advantage of the Flyback concept includes its simplicity its known dyna mic behaviour and its capability of stepping the de voltage up and down. The drawback is low power using. The push-pull converter is a cost-effective solution for power up-to kWs and the control a strategy is simple. Anyway the Bridge concepts can get more wide power ranging and so is used. The major disadvantages of previous circuits are that the transformer leakage inductance causes high transient voltage across the bidge switches which in creases the switching rating and decreasing the reliability. For closing of this part of this chapter we can affirm that the C k SEPIC and Luo converter are capable for low power application and require two inductors instead one in comparison with basic converters Buck-Boost Fig. 7 . The main advantage of these is its reduced input and output current ripples. The Bridge converters can be proposed with inductor lowe r in comparison in previous C k SEPIC and Luo converter. Also from above analyses of topology is evident that converters Buck-Boost and Bridge concepts are capable for middle and high power application. In addition potentially both can be achieved the highest efficiencies. The main drawback of the Bridge converters is its discontinuou s output current when operat ing as a boost converter.
