Abstract
Surge endurance characteristics between foil conductors on printed wiring boards with and without earthed backing metal foil were studied in air at 20°C and 40-45%RH. The gap distance between the conductors ranged from 0.05mm to 2mm. The thickness of the board was 0.8mm or 0.3mm. The impulse voltage (1.2/20µs) was applied between the conductors. The experimental results show that the flashover on the board without backing metal occurs when the electric field strength on the HV electrode edge is increased to a certain magnitude which is independent of the gap distance. For the board with backing electrode, the field strength at the flashover depends on the gap distance and increases with the gap distance except in the case that positive flashover for the board thickness of 0.8mm. The increase in the field strength may result from electric field stabilization at the conductor edge due to the large amount of homo-charge on the board surface near the electrode edge. The calculation of the static electric field revealed that, in the case of the board with backing foil, the strong vertical field component on the board surface is produced near the sharp conductor edge by the existence of the earthed backing foil. A large number of the homo-charge stays on the board surface near the HV electrode due to the strong vertical field component on the board surface near the conductor edge.
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