How to Select Potting Compounds for DC-DC Converters? Balancing High-Voltage Insulation, Thermal Conductivity and Low-Stress Performance

Potting compounds for DC‑DC converters shall mainly address high‑voltage insulation, heat dissipation of power components, PCB moisture resistance, vibration protection and thermal‑cycling stress. For new‑energy vehicle DC‑DC modules, Elaplus SIPA 1850 thermally conductive silicone, PUR 1680 thermally conductive polyurethane and EP 1710 epoxy potting compound can be evaluated according to respective structures. If heat‑dissipation filling between components and housing is required instead of full potting, TCMP‑series thermal conductive gels can be further adopted to build low‑thermal‑resistance interfaces. Why Are DC‑DC Converters Prone to Thermal‑management Challenges? DC‑DC modules perform power conversion between different voltage levels. Thermal Conductivity for Automotive DC‑DC Converters Heat is generated by MOSFETs, SiC devices, transformers, inductors and other components during operation. Meanwhile, DC‑DC converters are generally installed within highly confined spaces. Actual working conditions therefore feature high voltage, elevated temperature, vibration, high power density and compact footprint. These impose far higher requirements on adhesive materials compared with general consumer‑electronics applications. Why Is Low‑stress Performance Critical for Full DC‑DC Module Potting? A typical module consists of multiple materials: PCB, power devices, copper busbars, ceramics and aluminum housings. These materials exhibit different thermal expansion upon temperature rise.If the whole module is fully constrained by high‑modulus rigid materials, displacement induced by thermal cycling may eventually lead to: For large‑area DC‑DC potting, the SIPA 1850 thermally conductive silicone potting system is recommended for priority evaluation. Core selection criteria: thermal conductivity, elasticity, insulation property and thermal‑cycle buffering capacity. When to Choose PUR 1680? For applications requiring enhanced mechanical support compared with silicones, yet avoiding the extreme hardness of certain rigid epoxies, PUR 1680 is worth consideration. It is well suited to balance the following performance requirements: Why Epoxies Are Still Required for High‑temperature & High‑voltage Modules? Certain DC‑DC structures place high priority on: Under such circumstances, epoxy systems such as EP 1710…