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Electronic Engineer's Manual: Criteria for determining creepage distance and electrical clearance in PCB Layout

在电子设备的设计与制造过程中，确保电气安全是至关重要的环节。为此，两个关键概念——爬电距离与电气间隙——被广泛应用于评估设备内部不同导电部件间的绝缘性能。爬电距离即沿绝缘表面测得的两个导电零部件之间或导电零部件与设备防护界面之间的最短路径。电气间隙则是在两个导电零部件之间或导电零部件与设备防护界面之间测得的最短空间距离。即在保证电气性能稳定和安全的情况下，通过空气能实现绝缘的最短距离。一般来说，爬电距离要求的数值比电气间隙要求的数值要大，布线时须同时满足这两者的要求（即要考虑表面的距离，还要考虑空间的距离），开槽（槽宽应大于1mm）只能增加表面距离即爬电距离而不能增加电气间隙，所以当电气间隙不够时，开槽是不能解决这个问题的，开槽时要注意槽的位置、长短是否合适，以满足爬电距离的要求。元件及PCB的电气隔离距离（电气隔离距离指电气间隙和爬电距离的综合考虑）对于Ⅰ类设备的开关电源（本公司的大部分开关电源均为Ⅰ类设备）,在元件及PCB 板上的隔离距离如下：（下列数值未包括裕量）。 a、对于AC—DC 电源（以不含有PFC 电路及输入额定电压范围为10....

2024-07-08 14:02:49 1077 : #PCB Layout#Creepage distance#Electrical clearance

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