PC系统的EMC案例分析
EMC Case Analysis of the PC System
摘要 介绍了两个典型的EMC案例,即针对计算机中电源端口耦合到电信端口的传导骚扰,提出了针对电源模块电路直流输出的电容旁路措施;针对CPU散热设计影响整机辐射骚扰,提出改善散热器接地方式的措施。重点介绍了在错综复杂的电磁系统中排查真正的干扰源、整改分析的过程,并指出成本可控、能在工厂量产的解决方案,才是真正的工业解决方案。
关键词 EMC 电信端口;整改分析;计算机
Abstract Two EMC cases and solutions in personal computer (PC) are presented. One
case is on conducted emission coupled from power port to telecommunication port,with
the solution as capacitance bypass in DC output of the power supply unit circuit.And the
other is on radiated emission derived from high-speed signal lines in motherboard,with
the solution as improvement in grounding means of the CPU heatsink. The content is
detailed in troubleshooting and analysis process, despite of complicated elements.It
points out that the solution with cost controlled and that can be realized in mass
production is the real solution.
Keywords EMC; telecommunication port; troubleshooting; PC
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