Application analysis on the simulation of the ACL for PCB ground net in EFT test

The EFT/B test is one of the EMC immunity tests, which aims to evaluate the anti-interference capability of electronic and electrical equipment to the EFT/B signal. As there is the ACL in the return path of high frequency signals, it causes the voltage fluctuation on the return path, and affects the normal operation of the circuit during the EFT test. The value of the ACL is one of the important factors, which determines whether one product can pass the EFT/B test. This paper analyses the principle of the circuit failure caused by the ACL in the ground network of PCB in the air conditioner, and presents the reasonable rectifier measurements verified by simulation and test.