Controller with cooling

An electric controller comprising:

• a housing having a sealed interior region, the housing including first and second sides separated by a first dimension d1, the housing also including third and fourth sides that extend between the first and second sides and that are separated by a second dimension d2 that is transverse with respect to the first dimension d1, the housing further including fifth and sixth sides that extend between the first and second sides and also extend between the third and fourth sides, the fifth and sixth sides being separated by a third dimension d3 that is transverse with respect to the first dimension d1 and the second dimension d2;
• a plurality of circuit boards arranged in a stacked configuration within the sealed interior region of the housing, the plurality of circuit boards including a first circuit board, a second circuit board and a third circuit board, the second circuit board being positioned between the first and third circuit boards, the first, second and third circuit boards each including a first major side that faces toward the first side of the housing and a second major side that faces toward the second side of the housing, the first circuit board being positioned adjacent the first side of the housing, and the first circuit board including heat generating components positioned at the first major side of the first circuit board;
• the first side of the housing including a first wall having a heat sink integrated with the first wall, the heat sink including a plurality of spaced-apart cooling fins located outside the sealed interior region, the plurality of spaced-apart cooling fins being spaced-apart along the third dimension d3, the plurality of spaced-apart cooling fins having lengths that extend along the second dimension d2 and heights that extend along the first dimension d1, the plurality of spaced-apart cooling fins being separated from one another by air-flow channels, and the heat sink being configured to transfer heat generated by the heat generating components at the first circuit board from the sealed interior region to the plurality of spaced-apart cooling fins;
• and
• the housing defining an air-flow plenum at the third side of the housing for directing air flow from a forced air source to the air-flow channels, the air-flow plenum being defined at least in part by a second
• wall of the housing that is located at the third side of the housing and that is obliquely angled relative to a direction of air flow of the air flow from the forced air source, the second wall being configured to deflect the air flow from the forced air source toward the air-flow channels, the second wall separating the air-flow plenum from the sealed interior region and being obliquely angled relative to the first and second major sides of the first circuit board, the first major side of the first circuit board defining a reference plane that intersects the second wall.