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跟着便携电脑的标准越来越小，重量越来越轻，早年作为电脑的“小尾巴”的电源适配器现在好像要叫“大尾巴”了!电源适配器怎样完结小型化，来配得上越做越小的便携电脑则成为一项有必要考虑的问题。 本文引用地址：http://www.eepw.com.cn/article/201709/364368.htm从功率器件展开来看，从NPN型功率器件展开到MOS管功率器件只用了大约10年的时间，功率器件的标准缩小了5倍;而在运用硅MOS管的30年期间，器件的标准并没有进步许多，功率虽然有10%的进步，但是器件标准缩小还不到10%;直到包含GaN在内的新材料出现后，不到3年的时间，功率器件的功率及标准的进步又继续加快。在未来的十年，估量将在2025年再次进步3~5倍，其他，功率也会抵达95%~99%。由此看来，新材料的展开会是功率器件展开的重要促进要素之一。
图1 功率器件的展开 作为世界上第一家也是仅有的氮化镓(GaN)功率IC公司，纳微(Navitas)也正是看到了这一展开规则，最早选用新式GaN功率芯片——AllGaNTM。新式功率芯片为功率器件带来了速度和功率两方面的进步。 由于硅材料的结构特性所限，一贯无法一同满意速度和功率作为功率器件的两大规划参看方针。AllGaNTM通过配备新式拓扑——有源钳位反激 (ACF) 拓扑结构和新材料，并将驱动和GaN集成到一同，然后完结开关速度和功率两者的一同进步。新功率器件能够供应高达400MHz的开关速度，其速度比典型的变换器规划快了3至4倍，损耗下降40%，密度进步达5倍，系统本钱也会下降20%，然后完结更小的标准和更低的本钱。该规划完全符合欧盟CoC Tier 2及美国能源部6级 (DoE VI) 所标准的能效标准，更在满负载下完结超越94%的最高尖峰功率。
图2 AllGaNTM功率IC器件结构 单芯片GaN功率IC与半桥GaN功率IC 纳微在推出AllGaNTM平台后，针对新式材料GaN先后推出了两类功率IC，即单芯片GaN功率IC和半桥芯片GaN功率IC。 纳微单芯片GaN功率IC是一款在650V下的单片式集成产品。该款产品选用5mm x 6mm QFN标准封装。考虑到本钱问题，纳微单芯片GaN功率IC整个系列只用了这样一个封装方式。驱动选用内置驱动，高压信号输入时，即可实轻松现功率变换。纳微一同创始人兼首席执行官Gene Sheridan介绍称，通过这样的驱动器整合，以软开关为例将单芯片GaN功率IC与硅器件对比的话，硅器件电压上升速度很快，会有阴影。而选用单芯片GaN功率IC器件，开关速度到1M时，开关电压为500V，由此可见，选用单芯片GaN功率IC器件完全没有开关损耗， EMI功能也很好。
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