Heat exchanger for power electronics

A heat exchanger comprising a pair of metal plates joined along corresponding mating surfaces, wherein at least one of the metal plates comprises a plurality of connected recesses which form a fluid circuit between the plates when the plates are joined, wherein the fluid circuit comprises an inlet, an inlet manifold, an outlet, an outlet manifold, and a plurality of flowpaths extending between and fluidly connecting the inlet manifold and outlet manifold, wherein one or more of the plurality of flowpaths comprise a fluid passage and a flow constriction, and wherein a ratio of the hydraulic diameter of the flow constriction to the hydraulic diameter of the fluid passage increases with increasing distance from the inlet;

• wherein a first flow constriction is disposed in the fluid passage closest to the inlet and comprises a ratio of hydraulic diameter of the flow constriction to the hydraulic diameter of the fluid passage of between 0.3 and 0.5 inclusive or end points.

A heat exchanger comprising a pair of metal plates joined along corresponding mating surfaces, wherein at least one of the metal plates comprises a plurality of connected recesses which form a fluid circuit between the plates when the plates are joined, wherein the fluid circuit comprises an inlet, an inlet manifold, an outlet, an outlet manifold, and a plurality of flowpaths extending between and fluidly connecting the inlet manifold and outlet manifold, wherein one or more of the plurality of flowpaths comprise a fluid passage and a flow constriction, and wherein a ratio of the hydraulic diameter of the flow constriction to the hydraulic diameter of the fluid passage increases with increasing distance from the inlet;

• wherein a first group of two or more adjacent flowpaths closest to the inlet comprise a flow constriction having a first flow constriction hydraulic diameter and a second group of two or more adjacent flowpaths, not in the first group, comprise a flow constriction having a second flow constriction hydraulic diameter, and wherein the second flow constriction hydraulic diameter is greater than the first flow constriction hydraulic diameter.

A heat exchanger comprising a pair of metal plates joined along corresponding mating surfaces, wherein at least one of the metal plates comprises a plurality of connected recesses which form a fluid circuit between the plates when the plates are joined, wherein the fluid circuit comprises an inlet, an inlet manifold, an outlet, an outlet manifold, and a plurality of flowpaths extending between and fluidly connecting the inlet manifold and outlet manifold, wherein one or more of the plurality of flowpaths comprise a fluid passage and a flow constriction, and wherein a ratio of the hydraulic diameter of the flow constriction to the hydraulic diameter of the fluid passage increases with increasing distance from the inlet;

• comprising greater than two groups of adjacent flowpaths through the heat exchanger, each flowpath comprising a fluid passage and a flow constriction, wherein the flow constrictions in flowpaths of groups further distanced from the inlet comprises a flow constriction hydraulic diameter equal to from 1.2 to 1.5 times the flow constriction hydraulic diameter of the flow constrictions in the flowpaths of groups immediately adjacent and closer to the inlet.