Design of a serial impingement cooling heatsink for a 30 kW PV string inverter

The design of a cooling solution for a 30 kW string inverter is detailed in this paper. As opposed to traditional solutions, a novel approach has been proposed, consisting of three pinfin copper heatsinks tightly arranged with mutual airflow. This solution has been characterized on a dedicated test bench, partly based on a $\mathrm{T}_{\mathrm{j}}(\mathrm{I}_{\text{DS}},\mathrm{V}_{\text{DS}})$ TSEP itself precisely calibrated, both being described in this paper. Comparisons between traditional solutions, expected solution, characterized solution, and perspective solutions have been conducted based on the CSPI indicator, reaching up to 34 W.K⁻¹.L⁻¹.