No abstract

In order to evaluate the robustness of automotive ECU's against electrostatic discharge, a conventional method where electrostatic discharge pulses are applied to connector parts on a printed circuit board is commonly used. However, until now quantitative redesigning principles to improve the static electricity tolerance that fully utilize the test data shown below have not been made clear because the propagation mechanism of static electricity on a circuit board was not clear. This paper describes the ESD current measurement technique which detects the near magnetic field generated by ESD currents. We developed a technique to measure the ESD currents using a new loop antenna on the circuit board. The ESD current, was generated with the static electricity applied to a model circuit pattern in conformity with IEC and ISO standards and measured using the antenna. It was also possible to visualize how static electricity energy would propagate through the circuit board. We concluded that ESD current measurement via the near magnetic field and using a small shielded loop antenna was effective