Analysis of Arc Failure Mechanism of LED Power Supply Rectifier Chip
The arc-shaped failure morphology of bridge rectifier chips used in LED power supplies exhibits a certain typicality,which suggests a specific failure mechanism. Starting from the interconnection method of the rectifier bridge,the analysis shows that this interconnection inevitably creates a radial current. The distribution of this current is non-uniform at the outer edge of the welding zone,resulting in uneven temperature rise at the PN junctions due to the power dissipation in that region. This temperature rise leads to the formation of several peak temperature points,one of which becomes the initiation point for the chip failure during reverse operation. Additionally,the arc high-temperature regions between the junction temperature peaks will evolve into the arc failure area.
LED switching power supplybridge rectifierforward biasreverse bias
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