| 摘要 |
PROBLEM TO BE SOLVED: To efficiently and sufficiently cool a heat generating element. SOLUTION: In the cooling device, a switching element 40 is liquid-sealed by cooling liquid, having a boiling point lower than the permitted operation atmosphere temperature of the switching element 40 and showing high insulation property. A cooling liquid 28 cools the switching element 42 mainly through latent heat of vaporation. The cooling liquid 28 is cooled by a liquid cooling device 50 which circulates water in a channel 26 surrounding a storage part 23 and is liquefied. When the inside pressure of the storage part 23 is increased, the inside pressure of a cooling liquid tank 30 connected to the storage part 23 through a pressure guiding path 34 is increased also. Then, an elastic film 32 swells and makes a lower side channel 26a narrow. Thus, the flow rate of the upper side channel 26a increases relatively, and condensation of the vaporized cooling liquid 28 is promoted. A pressure sensor 58 detects the pressure of the cooling liquid tank 30. When pressure becomes high, output of the circulation pump 54 of the liquid cooling device 50 is increased, and therefore the cooling effect is enhanced.
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