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This power supply package system is designed for use in terminals, where small efficient power supplies are required without the noise associated with a fan.
English (United States)
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Liquid Cooled Power Supply With Liquid Expansion Accommodation
This power supply package system is designed for use in terminals, where
small efficient power supplies are required without the noise associated with a
The figure shows front and side views of a typical power supply 10 in which
various components 12 are mounted on a board 14. A liquid tight metal case 16
is fitted over the board and components. The case is then filled with a suitable
liquid 18. A number of hollow deformable spheres 20 are also present in the
power supply. The case 16 is filled with the liquid 18 under a slight negative
pressure at normal room temperature. At operating temperature, the liquid will
expand, bringing the pressure on the case 16 to zero. Expansion and
contraction of the deformable spheres takes up the volume change of the liquid
due to its terminal coefficient of expansion. The radius of curvature of spheres
20 is large enough to keep their contact points with the components, including
the case 16, to a minimum.
In operation, the spheres float freely in the liquid 18 and do not interfere with
thermal convection which moves the liquid from contact with the components 12
to contact with the case 16, so as to dissipate the heat arising on the
components. Further, metal case 16 acts as an electromagnetic shield.