With the rapid expansion of scenarios such as new energy grid connection, data center construction, and electric vehicle overcharging, solid-state transformers（SST）With advantages such as modular design, high power density, and bidirectional energy flow, it is gradually replacing traditional oil immersed transformers and becoming the core equipment of smart grids and new power systems. asSSTof “heart”High frequency transformer（HFT）The performance directly determines the overall efficiency and reliability of the machine —— Its operating frequency has increased fromSiCdevice20kHz-100kHzexpand toGaNdevice500kHz-1MHzUnder high voltage and large capacity conditions, it faces multiple challenges such as temperature rise control, insulation protection, and thermal stress shock. High performance epoxy resin potting adhesive for high-frequency transformers “Protective armor” and “Cooling bridge”It is becoming a pain point for the industry to be cracked and promotedSSTThe key material support for technology implementation.

The three core pain points of high-frequency transformers:

1、The heat dissipation problem is highlighted:High frequency conversion leads to a significant increase in magnetic core losses and winding copper losses. Data shows that high-frequency transformer losses account forSSTTotal loss 35%If the heat cannot be exported in a timely manner, it will cause problems such as demagnetization of the magnetic core and insulation aging. Traditional sealing adhesive has insufficient thermal conductivity0.5W/m・KIt is difficult to meet the demand for increasing power density.

2、Thermal stress is prone to failure:The thermal expansion coefficients of the iron core, copper winding, and potting material differ by more than ten times - 30℃~120℃In the high and low temperature cycles, local stress concentration is prone to occur, leading to cracking of the sealing layer and insulation failure, which seriously affects the service life of the equipment.

The four major advantages of high-performance epoxy resin sealant:

1. High thermal conductivity design, solving the problem of temperature rise

thermal conductivity1.2W/m・KFar beyond the industry's common standards1.0W/m・KStandard, can quickly export the heat generated by the magnetic core and winding. Combined with vacuum sealing technology, eliminate internal bubbles to form a uniform and continuous heat dissipation channel, ensuring the high-frequency transformer operates smoothly60~100kHz Stable operation under the above working conditions.

2. Thermal stress optimization to enhance structural reliability

By using material modification technology, the anti cracking ability of materials can be improved, which can withstand-40~℃+180℃Cold and hot shock provides reliable protection for high-frequency transformers.

3. High voltage insulation protection, suitable for multi scenario applications

breakdown voltage26kV/mm，CTI＞600Far beyondSST 10kVside18kV/1minThe power frequency withstand voltage requirements. High performance epoxy resin can not only fix the winding structure, resist mechanical vibration, but also effectively isolate external environmental influences such as humidity and dust, suitable for medium and high voltage（≥10kV）Differences between three-level topology and low-voltage low-power two-stage matrix topologySSTDesign proposal.

For more information on high-performance epoxy resin sealant, please contact Shanghai Mingchengjin Material Technology Co., Ltd