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In this article two functional modes of the Fly-back Converter (Continuous Conduct Mode and Discontinuous Conduct Mode) are particularly analyzed, which include their characteristics, applications, the critical pattern of two functional modes is argued, both the exact boundary from the angle of circuit parameters is crystallized, at the same time, basic principle of PFC under the DCM mode is introduced, which settle theoretical basis for the subsequent design; by establishing the mathematic model of the converter, a further investigation of the configuration is made, qualitatively and quantitatively, analyzed to settle exactly theoretical basis for the subsequent emulation and the experimental parameter; from the angle of steady-state analysis, the transfer function of the system is deduced to establish dynamic small-signal state equation, emulating the system with the help of matlab, then according to the simulation result and the theory of PFC revise the system, lastly, we adopt the project which add a zero-pole compensator to the voltage loop, by this way, a satisfied system performance is gained and the PFC scheme is ensured successfully; finally, based on the previously-done work, we combining with the situation of specific design requirement, acquired the numerical value of each unit devices in this converter

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The Indemnitee shall not settle or compromise the indemnification claim without the prior written consent of the Indemnitor, and the Indemnitor shall not settle or compromise the indemnification claim in any manner which would have an adverse effect on the Indemnitee's interests including without limitation any rights under this agreement or the scope, validity of enforceability of Party B's rights in and to the proprietary technologies, without the prior written consent of the Indemnitee, which consent, in each case, shall not be unreasonably withheld or delayed.

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In this background, according to professional practice and emploment,the author discuss the main problems of Social Work in china and the lodestar that we should follow to settle these problems and how to settle these problems.

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In I walk up newly this time of lesson object use new lesson object principle, rightness ever drive oneself see as experience of standpoint and way of doing carried on to re- examine, to oneself of teaching thought and the behavior carried on to introspect, teacher should from"with teach settle learn" to"with learn settle teach" change;From"the induction of the value ready-made conclusion" to"value learning process of experience" change.

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