Why vacuum molded PCB Transformers is Important

Why vacuum molded PCB Transformers is Important

Potting hazards:

Potential for cavitation, leading to partial discharge, hot spots, and thermal cycling cracks
Service life may be reduced by 40–60%

Advantages of vacuum potting:

Evacuates air at ≤5 mbar
Injects UL94V-0 epoxy resin and cures in a moisture-free environment
Significantly improves insulation performance and thermal stability

Actual Results and Test Data

A vacuum-potted medical device transformer passed a 50,000-hour accelerated aging test.
A non-vacuum-potted device failed after 18,000 hours.

Ability to cope with extreme environments

Recommendations for verifying potting quality

–Don’t rely solely on the datasheet, request:
–X-ray scan showing void distribution
–Cross-section report measuring bubble size
–Thermal shock test (-55°C to +150°C, 500 cycles)
–Partial discharge test <5 pC (at 2x the operating voltage)

YHDC’s PCB transformers utilize vacuum forming technology, resulting in extremely high voltage withstand performance, enhanced resistance to mechanical shock, and stable mechanical performance in high and low temperature environments. They are suitable for high-reliability applications such as medical, military, industrial control, and automotive electronics.