地线设计技术研究

Research on Grounding Design

文章从电路参考点的角度考虑出发,分别介绍了四种不同的接地方式。单点接地是将所有的地连在一点,没有共阻抗耦合和低频地环路的问题;多点接地是通过许多短线连接起来,可以减少地阻抗产生的共模电压;混合接地是在系统内部既使用单点接地,又使用多点接地。接地时要求安全接地、雷电接地以及EMC接地。要注意大系统接地、地阻抗和地环路的问题。在接地系统应用时,因四种接地方式各自具有不同的特点,决定了它们应用场合的不同。

The article from the circuit reference point for point of view, were introduced four different grounding. Single-point ground is connect all the grounding together with no problems of impedance coupling and low- frequency loop ; Multi-point ground is linking by a number of short-term, that could reduce the resistance to produce the common-mode voltage; Mixed grounding is not only use single-point ground, but also use multipoint ground. The circuit requires safely grounding, thunder grounding and EMC grounding, also should notice the problems about great system grounding, grounding impedance and grounding circular course. The four grounding ways have the different applicant situation because of each characteristic.