Power electronics contamination risks
Power electronics handle high currents, high junction temperatures, and large parasitic voltages. Surface contaminants can lead to hot spots, tracking, and catastrophic failures under load. Thermal cycling can concentrate residues and exacerbate migration.
Cleaning, conformal protection, and robust design are essential. ZESTRON supplies cleaning formulations compatible with heavy copper and power module materials and validates processes to maintain reliability under high-power stress.
Unique risks in power electronics
Challenges include:
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high thermal gradients that mobilize contaminants
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aggressive electrical stress at terminals and busbars
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insulating materials that degrade with ionic contamination
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difficulty cleaning complex assemblies with potting or heavy copper
These factors require tailored cleaning, inspection, and qualification.
Best practices for mitigation
Recommendations:
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pre-cleaning before potting and after assembly steps
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use of non-hygroscopic conformal materials at critical interfaces
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targeted SIR and thermal cycling with electrical load
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routine ROSE or IC sampling at process control points
ZESTRON’s power-electronics customers benefit from custom cleaning agents and test plans to ensure uptime and safety.