ELECTRONIC CONTROL UNIT AND ELECTRIC POWER STEERING APPARATUS HAVING THE SAME

摘要

In an electronic control unit, high-heat-generating devices are mounted on a first surface or a second surface of a board, a heat-dissipating member is located facing the first surface of the board, and a heat-conducting member is located between the board and the heat-dissipating member. The heat-conducting member is in contact with the high-heat-generating devices to transfer heat of the high-heat-generating devices to the heat-dissipating member. A ratio of the number of the high-heat-generating devices mounted on the board to the number of the high-heat-generating devices arranged inside a first limited region of the first surface or a second limited region of the second surface is greater than a predetermined ratio. The second limited region is located at a position corresponding to the first limited region.

主权项

1. An electronic control unit for controlling a control target, the electronic control unit comprising:
a board having a first surface and a second surface opposite to the first surface; a plurality of high-heat-generating devices mounted on the first surface or the second surface of the board and configured to generate heat greater than a predetermined heat value when the electronic control unit operates; a controller configured to control the control target by controlling at least one of the plurality of high-heat-generating devices; a heat-dissipating member located facing the first surface of the board; a heat-conducting member located between the board and the heat-dissipating member and in contact with the plurality of high-heat-generating devices to transfer the heat of the plurality of high-heat-generating devices to the heat-dissipating member, wherein a ratio of a total number of the plurality of high-heat-generating devices mounted on the board to a number of the high-heat-generating devices arranged inside a first limited region of the first surface or a second limited region of the second surface is greater than a predetermined ratio, and the second limited region is located at a position corresponding to the first limited region.