Direct cooling of a planar magnetic converter using dielectric liquid forced convection enabled by additive manufacturing

•Additive-manufacturing-enabled direct liquid cooling studied theoretically, computationally, and experimentally.•Maximum temperatures, temperature gradients and pressure drops computationally estimated for liquid cooling of a planar transformer.•Maximum temperatures and pressure drop experimentally measured.•Pumping power, pressure drop, and thermal resistance parameters characterized for several flow rates and transformer powers.•Direct liquid cooling shows lower overall thermal resistance with lower pressure drop than a state-of-the-art indirect liquid cooled cold plate methods.