Download Advanced DC/DC Converters by Fang Lin Luo, Hong Ye PDF

By Fang Lin Luo, Hong Ye

DC/DC conversion strategies have gone through quick improvement in contemporary a long time. With the pioneering paintings of authors Fang Lin Luo and Hong Ye, DC/DC converters have now been looked after into their six generations, and through a coarse count number, over 500 varied topologies at the moment exist, with extra being constructed each one year.

Advanced DC/DC Converters deals a concise, sensible presentation of DC/DC converters, summarizing the spectrum of conversion applied sciences and offering many new rules and greater than a hundred new topologies. The remedy starts with historical past fabric on DC/DC conversion and discussions on voltage elevate and super-lift converters. It then proceeds via every one iteration, together with the groundbreaking 6th generation--converters built by means of the authors that may be cascaded for top voltage move achieve.

More than 320 figures, 60 tables, and 500 formulae let you extra simply clutch the final constitution of complex DC/DC converters, supply quick entry to express information, and assist you quick make certain the values of your personal circuit elements. Nowhere else within the literature are DC/DC converters so logically looked after and systematically brought. Nowhere else are you able to locate designated info on prototype topologies that symbolize a tremendous contribution to fashionable energy engineering.

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23 Buck converter. 3 Buck-Boost Converter The buck-boost converter is a step down/up DC/DC converter. It works in third-quadrant operation. 25. 10) where T is the repeating period T = 1/f, f is the chopping frequency, ton is the switch-on time, and k is the conduction duty cycle k = ton/T. By using this converter it is easy to obtain the random output voltage, which can be higher or lower than the input voltage. It provides great convenience for industrial applications. 24 Boost converter. 2 Transformer-Type Converters Since all fundamental DC/DC converters keep the linkage from input side to output side and the voltage transfer gain is comparably low, transformertype converters were developed in the 1960s to 1980s.

According to the transferred power becomes large, the power losses increase largely. Main power losses are produced during the switch-on and switch-off period. How to reduce the power losses across the switch is the clue to increasing the power transfer efficiency. Soft-switching technique successfully solved this problem. Professor Fred Lee is the pioneer of the soft-switching technique. He established a research center and manufacturing base to realize the zero-current-switching (ZCS) and zero-voltage-switching (ZVS) DC/DC converters.

26 Forward converter. where N is the transformer turn ratio, and k is the conduction duty cycle k = ton/T. In order to exploit the magnetic ability of the transformer iron core, a tertiary winding can be employed in the transformer. 27. 27 Forward converter with tertiary winding. 28 Push-pull converter. 2 Push-Pull Converter The boost converter works in push-pull state, which effectively avoids the iron core saturation. 28. Since there are two switches, which work alternately, the output voltage is doubled.

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