品牌:Honeywell
起订:1件
供应:100件
发货:3天内
信息标签:Honeywell 30731811-001,供应,电子、电工,工控系统及装备
Honeywell 30731811-001
在设计多层PCB电路板之前,设计者需要首先根据电路的规模 电路板的尺寸 电磁兼容(EMC) 电路的规模、电路板的尺寸电磁兼容( 电路的规模 电路板的尺寸和电磁兼容 ) 的要求来确定所采用的电路板结构,也就是决定采用 4 层,6 层,还是更多层数的电路板。确定层数的要求之后,再确定内电层的放置位置以及如何在这些层上分布不同的信号。这就是多层 PCB 层叠结构的 选择问题。层叠结构是影响 PCB 板 EMC 性能的一个重要因素 层叠结构是影响 性能的一个重要因素,也是抑制电磁干扰的一个重要手段。本节将介绍多层 PCB 板层叠结构的相关内容。由于工程师们都在竭尽所能地获得其电源的**高效率,时序优化正变得越来越重要。在开关期间,存在两个过渡阶段:低压侧开关开启和高压侧开关开启。
低压侧开启开关至关重要,因为该过渡阶段几乎没有损耗,也即“无损开启”.在高压侧开关关闭以后,电感电流驱动开关节点电压无损接地。开启低压侧开关的**时机便为过渡结束时。如果在低压侧开启以前主体二极管短暂导电,则其无关紧要,因为它不会导致反向恢复损耗。在下一个开关过渡之前,该结点处的过剩载流全部耗散。但是,如果电流仍然长时间存在于主体二极管内,则会有过高的传导损耗。高压侧 FET 开启时序是**为重要的过渡。由于同低压侧 FET 存在交叉导通,因此开启过早会导致直通损耗;开启过晚又会导致传导损耗增高,并且会将过剩载流注入低压侧 FET 主体二极管内(必须对其进行恢复)。不管哪种情况,都会降低效率。
为了说明效率与驱动信号之间时序的关系,我构建起了一些具有驱动器信号可调节延迟的电源。之后,我比较了效率与延迟时间,对其存在的关系进行了研究。图 1A-1C 显示了结果。
图 1A 显示了当高压侧 FET 在低压侧 FET 完全关闭之前开启时的情况。在低压侧栅极驱动中有一个明显的更大的Miller 区域,其低压侧 FET 和高压侧 FET 同时导通,从而在功率级中产生直通电流。当低压侧 FET **终关闭时,在开关节点处存在额外的电压过冲。在图 1B 中,在低压侧 FET 关闭且主体二极管中形成电流以后,高压侧 FET 才开启。当高压侧 FET 开启时,其恢复该主体二极管,并且会有一个电流峰值让开关节点电压出现振铃。但是,由于所用MOSFET体二极管的反向恢复时间(12 nS)极短,因此这种现象并不明显。主体二极管速度越慢,振铃越明显。图 1C 拥有**高的电源效率。在高压侧开关开启以前,低压侧栅极电压降至接地电压附近。高压侧在更低的主体二极管导电以前开启,开关节点振铃**小化。
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