Solid State Relay Module Thermal Layout for Fast High-Voltage Switching

The patent replaces mechanical contactors with solid state switches (MOSFETs or IGBTs) that have no moving parts. The solid state relay module uses electronic switching devices controlled by gate signals to open and close electrical circuits, eliminating mechanical wear and contact degradation. This substitution provides faster switching speeds (microsecond range vs. millisecond for mechanical) and significantly extended operational lifespan without mechanical failure modes.

The patent introduces thermal interface materials (thermal paste between the solid state switch and heat sink, and resilient thermal interface pads between the heat sink and housing) as intermediary elements to optimize heat transfer. These materials fill micro-gaps and ensure intimate thermal contact, acting as mediators that efficiently conduct heat from the solid state switches through the heat sink to the thermally conductive housing, preventing overheating while maintaining high switching reliability.

The patent merges multiple functions into integrated components: the solid state switches, control circuitry, thermal management system, and protective housing are combined into a single compact module. The heat sink serves both as a thermal management component and as part of the structural housing. The resilient thermal interface pads provide both thermal conduction and mechanical compliance. This integration achieves miniaturization while maintaining ease of manufacture through modular assembly of standardized components.