14个经验技巧,教你学会电源设计!

Release time:2025-04-21
author:AMEYA360
source:网络
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  在电源设计领域中,经验的积累往往决定了产品的稳定性和可靠性。若是电子新人了解到一些实用的设计技巧,电源设计将事半功倍。下面将总结大佬的14条电源设计经验,以此提供参考和指导。

14个经验技巧,教你学会电源设计!

  1电路设计经验

  肖特基散热片连接:肖特基的散热片可以直接接到输出正极线路,从而省去绝缘垫和绝缘粒的使用。

  RCD吸收元件选择:对于15W以上功率的电路,避免使用XX4007作为RCD吸收元件,因其速度慢、压降大,易导致高温失效。

  输出滤波电容耐压:输出滤波电容的耐压值应至少符合1.2倍余量,以避免量产中的损坏现象。

  卧式电容跳线布置:大电容或其他电容做成卧式时,底部如有跳线应放在负极电位,以节省成本并避免使用套管。

  元件承认书描述:整流桥堆、二极管或肖特基等晶元大小元件,在承认书或BOM表中需明确描述,以管控供应商送货一致性。

  Snubber电容选择:为处理异音问题,Snubber电容优先使用Mylar电容。

  启动电阻保护:启动电阻如使用在整流前,需串联一颗几百K的电阻,以防电阻短路时损坏IC和MOSFET。

  高压大电容并联:高压大电容并联一颗103P瓷片电容,对辐射30-60MHz有抑制作用,有助于EMI整改。

  Y电容容量限制:使用的Y电容总容量不能超过222P,以避免漏电流影响,设计时需特别留意安规要求。

  2电路调试经验

  冷机启动电流:冷机时,PSR需1.15倍电流能开机,SSR需1.3倍电流能开机,以确保老化后启动良好。

  异常测试:短路或开路某个元件后,如仍有输出电压,则需进行LPS测试,过流点不能超过8A。

  3安规与测试经验

  安规开壳样机准备:安规开壳样机所有可选插件元件需装上供拍照用,L、N线和DC线与PCB需点白胶固定。

  EMS项目测试:进行EMS项目测试时,需测试至产品损坏为止,如ESD雷击等,并记录产品余量。

  4变压器设计注意事项

  变压器B值控制:反激拓扑结构中,变压器B值需小于3500高斯,以避免磁饱和导致的动作失控。需确认过流点、开机瞬间、输出短路、高温、高低压等状态下的磁饱和情况。


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