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Ground Current Crosstalk Analysis and Suppression in High Power Cascaded Chopper Braking Circuit
Peifei Li,Lei Zhang,Xiaofei Zhai,Bin Ouyang 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.2
This paper systematically investigates the ground current crosstalk (GCC) of high-power cascaded chopper braking circuit (CCBC). Turning on and off the IGBTs of the CCBC will generate GCC problem between the upper and lower chopper braking circuits. The GCC may cause the freewheeling diode to be hard-off , resulting in strong electromagnetic interference and serious losses, and even causing the freewheeling diode to fail due to reverse recovery. This paper establishes the ground current model of CCBC and the GCC is predicted base on the model. To minimize the infl uence of GCC, the solutions of inserting damping resistors to the ground current path and optimizing IGBT timing are proposed. The correctness of the analysis is verifi ed by simulations and experiments. The proposed methods are of great signifi cance for improving the reliability of high-power cascaded chopper braking devices and reducing electromagnetic interference and losses.
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Sisi Ma,Ligang Lin,Xinyang Li,Wenying Shi,Xiaofei Zhai,Jing Yang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.112 No.-
Developing multifunctional, efficient and durable membrane for treating complex oily wastewater ishighly desirable but still a challenge due to the severe membrane fouling. Herein, nanosponge membranewith 3D-macrocycle b-cyclodextrin (b-CDs) as molecular cage was manufactured by azide-alkyne clickreaction for oil/water treatment and antifouling properties simultaneously. The macrocyclic ‘molecularcage’ geometry of b-CDs can induce various guest molecules into their cavities. When clickable b-CDN3was fixed onto a clickable EVAL- membrane surface, the hydrophilicity of the membrane was greatlyimproved. Furthermore, the molecular cage–grafted membrane (EVAL-g-CD) showed better antifoulingperformance than a pure EVAL membrane, with lower water flux decline (15%) and higher water fluxrecovery (91%). The flux and separation efficiency values of the EVAL-g-CD membrane were higher than120 Lm2h1 and 99%, respectively. The EVAL-g-CD membrane also exhibited good adsorption performancefor organic pollutants owing to its cavity structure. Furthermore, the membrane showed desirablestability and its rejection remained at 99% after filtration. This proposed 3D membrane strategy based onmolecular cages sheds light on the formation of hydrophilic membrane surfaces and shows great promisefor potential applications such as the separation of oil-in-water emulsions.
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