Patent ID: 8164902
Filing Date: 2012-04-24
Classification: H05K

Abstract:
1. An electronic apparatus in which a plurality of semiconductor devices are mounted on each of a plurality of electronic circuit boards which are detachably mounted within a housing, and which includes a cooling system for cooling the semiconductor devices on the plurality of electronic circuit boards mounted in the electronic apparatus, wherein the plurality of semiconductor devices mounted on each of the electronic circuit boards have different heat dissipation, wherein the cooling system includes: a thermosiphon which is provided for each of the electronic circuit boards and transfers heat from a first semiconductor device having relatively high heat dissipation among the plurality of semiconductor devices mounted on the electronic circuit board to an outside of the apparatus; a heat pipe which is provided for each second semiconductor devices having heat dissipation lower than that of the first semiconductor device on the electronic circuit board and transfers heat from the second semiconductor devices to the thermosiphon; a thermal highway, which is provided within the housing of the electronic apparatus, is thermally coupled to the thermosiphon by the mounting of the electronic circuit board into the housing, and thereby collects and transfers heat from the thermosiphon and the heat pipe; and a radiating unit which transfers the heat collected and transferred by the thermal highway outside the housing, and wherein heat transfer capacity by the thermosiphon is set to be higher than heat transfer capacity by the heat pipe and lower than heat transfer capacity by the thermal highway, wherein each of the electronic circuit boards is received in a respective housing, a first portion of the thermosiphon is thermally coupled to a surface of the first semiconductor device, and a second portion of the thermosiphon is opened to and arranged on the top surface of the housing, wherein a portion of the thermal highway is arranged to be opposite to the opened surface of the thermosiphon in the housing of the electronic apparatus, wherein a thermal connector is interposed between the opened surface of the thermosiphon and the opposite surface of the thermal highway, and wherein one end of the heat pipe is thermally coupled to a surface of the second semiconductor devices and the other end is thermally coupled to one surface of the thermosiphon.