【选型】THERM-A-GAP™MCS30助力解决1.8kw DCDC散热问题
大家都知道DC是直流电源。DCDC就是通过一个转换器能将一个直流电压 (12V)转换成其他的直流电压(5V),我们称这个转换器为DC/DC转换器,DCDC的意思是直流变(到)直流(不同直流电源值的转换),只要符合这个定义都可以叫DCDC转换器。
在当今这个竞争激烈的时代,产品设计人员面临的挑战是:不仅要紧跟同行步伐,而且要保持领先群雄的地位。这就对那些欲借助差异化产品进行创新的系统设计人员提出了更高的要求。
创新的一种重要方法是使用高密度设计。为推出占位面积更小的解决方案,电源系统设计人员现在正集中研究功率密度(一个功率转换器电路每单位面积或体积的输出功率)的问题。高密度直流/直流(dcdc)转换器印刷电路板(pcb)布局最引人瞩目的范例涉及功率级组件的放置和布线。精心的布局可同时提高开关性能、降低组件温度并减少电磁干扰(EMI)信号。
图1 DCDC转换器原理图
虽然高密度布局一般有利于提升转换效率,但它可能会形成一个散热性能瓶颈。要在更小的占位空间内实现相同功耗,组件温度攀升会使较高的故障率和可靠性问题更严重。这其中MOSFET是最主要的散热器件,如何把MOSFET上的热量快速散出去成为解决这一问题的关键。目前常用的方法是用导热垫片将MOSFET的热量迅速导到外壳上散热,所以对导热垫片提出了要求。
针对1.8kw DCDC变换器的散热对导热垫片的要求是:
·导热系数为3.0W/mK以上;
·绝缘强度达到8 KVac/mm以上;
·硬度希望偏低些,shore OO不超过40,填缝能力强;
·力学强度高,不易破损;
·柔软性好,具有一定的压缩性。
针对上述要求,PARKER CHOMERICS推出THERM-A-GAP™MCS30(如图2),这是一系列超软(Shore 00-25)低重量损失,完全固化的热填充垫,适用于低偏转力应用,导热性适中,可靠性高。THERM-A-GAP™MCS30热填料垫的主要优点是它们的交联软凝胶结构与传统的高模量热垫相比具有优异的性能和长期热稳定性,不仅具有出色的长期物理和热学可靠性,而且还表现出对高达200°C连续应用温度的热氧化降解的抵抗力。其导热系数为3.0W/mK。硬度shore 00为25,可以紧密贴合在芯片表面与散热基板之间的界面,减少接触热阻,以提高导热效率。其最高压缩率可达到50%,而且绝缘强度达到11KVac/mm以上,而且MCS30有带玻纤的版本,力学强度高,不易破损且具有一定的耐摩擦性,非常适用于1.8kw DCDC变换器的散热。
图2 MCS30数据手册
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【经验】导热垫片老化变硬问题怎么解决?
导热垫片使用广泛,是最常用的导热界面材料,但导热垫片也存在一些问题,其中老化变硬问题比较突出,本文讲解了老化变硬问题产生的原因,危害及解决方法,给使用和开发导热垫片提供思路,并推荐固美丽的导热垫片,如MCS30、TPS55、TPS60。
【经验】光模块中各导热材料的应用及优缺点
光模块导热主要会用到空气,导热垫片,导热凝胶,U形金属块及高导热石墨等导热材料。其中空气没有成本但导热太差;导热垫片性价比高,但有一定压应力可能会造成光路偏离;导热凝胶可自动化生产且贴合度,任意成型,但前期准入门槛高;U形金属块导热效率高但增加重量,且需要开模;高导热石墨导热及均热效果突出但目前技术不够成熟且成本高。
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