大标题 - 副本.ppt

; Power electronic converters can convert power from AC-to-DC (rectifier),DC-to-DC (chopper),DC-to-AC(inverter),AC-to-AC at the same (AC controller) or different frequencies (cycloconverter).They are four types of power electronic converters.;converter [k?n?v?:t?] (n) [自]变换器 (A篇已经介绍过) convert (v.) vt.（使）转变；vi. 被转变； convert (n.) 皈依者 con-(together)+vert(to turn) rectifier [?rektifai?] (n) 整流器 chopper [?t??p?] (n) 斩波器 inverter [in?v?:t?] (n) 逆变器 [invert=in+vert] frequency [?fri:kw?nsi] (n) [物]频率 [frequent] cycloconverter [?saikl?uk?n?v?:t?] (n) 周波变换器 cyclo-(cycle 周期)+converter; Converters are widely used in applications such as heating and lighting controls,AC and DC power supplies,electrochemical processes,DC and AC motor drives,static VAR generation,active harmonic filtering,ect. 变换器被广泛应用于温控和光控，交流和直流电力供应，电化学的加工，直流和交流电机驱动，静态无功补偿，有源谐波滤波等等。 application [??pli?kei??n] (n) 应用 apply+【cation】 heating and lighting controls 温控和光控;supplies [s??pla?z] (v) 供应 electrochemical [i?lektr?u?kemik?l] (adj) 电气化学的 electro-（电，电的）+chemical（化学） processes [?pr?usesiz] （n）加工过程 pro-(居前，领先)+[cess]+es harmonic [hɑ:?m?nik] (adj) [物]谐波的 harmony (n.) filtering [?filt?ri?] (n) 过滤 ;Rectifiers; Diodes and phase-controlled rectifiers constitute the largest segment of power electronics that interface to the electric utility system today. 二极管和相控整流器是电力电子设备中最大的组成部分，它们的主要任务是与电力系统连接。 phase-controlled 相位控制 phase [feiz] (n) 相 constitute [?k?nstitju:t] （vt.）构成，组成 segment [?seɡm?nt] （n.）部分 section +-ment[去掉-tion,当“-c-”邻近“-m-”时改为 “-g-”];interface [?int?feis] (v.)（使通过界面或接口）接合，连接 inter-(在一起，交互)+face utility [ju?tiliti] (n.)功用，效用; The efficiency of the rectifiers is very high,typically in the vicinity of 98%,because device conduction loss is low and switching loss is practically negligible. 由于器件开通时损耗低，且其开关损耗几乎可忽略不计，故该类整流器的效率很高，典型值约为98%。 efficiency [i?fi??nsi]（ n.）效率 efficient + -cy [efficient (adj.)有效率的] effect【ex-+fect】 ty