ESDガンの垂直結合板への間接放電に対するプリント回路基板上の配線誘導電圧の不確定性とその低減

概要

論文の詳細を見る
International Electrotechnical Commission (IEC) prescribes immunity tests (IEC610000-4-2) of electronic equipment against electrostatic discharges (ESDs), and specifies indirect discharges from an ESD-gun onto a vertical coupling plane (VCP) in the vicinity of equipment under test (EUT) for simulating personnel discharges to conductive materials being adjacent to the EUT. According to IEC 61000-4-2 2001-04, the VCP shall be placed at a distance of 0.1m from the EUT, and the indirect discharge of an ESD-gun should be conducted to the centre of a vertical edge of the VCP, while the reference arrangement of EUT and the angles of inclination and rotation of the ESD-gun are not specifically determined. In order to clarify to what extent EUT arrangements affect test results, using a simple printed circuit board (PCB) with a trace in lieu of EUT, we measured the voltages induced on the trace for indirect discharges from an ESD gun with different angles of inclination and rotation. As a result, we found that the peaks of induced voltages vary by a factor of 1.7 for indirect discharges onto the centre of a vertical edge of a VCP, while the indirect discharges onto the vertical edge from the back side of a VCP reduce the uncertainty of peak voltages by ±5%. The latter finding provides a new method for indirect discharges onto a VCP, whose test results are unlikely to be affected by EUT arrangements.
2010-03-01