POWER SUPPLY UNIT

摘要

A power supply unit comprises a water-cooled heat sink to which a high heat generation electronic component, i.e., a power element, is fixed, and a board mounting a low heat generation electronic circuit component connected with the power element and on which the water-cooled heat sink is installed. In this power supply unit, a duct for air cooling the low heat generation electronic circuit component is formed of the water-cooled heat sink and the mounting board. At least two mounting boards on which the water-cooled heat sink is installed are provided and the duct is formed by arranging the two mounting boards so that the surfaces of the mounting boards on which the water-cooled heat sink is installed face each other.