Patent ID: 7345876
Filing Date: 2008-03-18
Classification: H05K

Abstract:
1. A compact converter, comprising: a compact casing having an air inlet and an air outlet, and comprising a bottom wall, a top wall and a side wall extended between said bottom wall and said top wall and defines a first and a second end portions of said compact casing, wherein said air inlet is formed on a middle portion of said top wall and said air outlet is formed on said side wall at said first end portion of said compact casing; a printed circuit board supported within said compact casing at a position between said top and bottom walls thereof to form an upper air channel between said printed circuit board and said top wall of said compact casing and a lower air channel between said printed circuit board and said bottom wall of said compact casing, wherein said lower air channel is communicating with said upper channel via an air communication channel which is formed at a position opposed to said air outlet on said side wall at said second end portion of said compact casing; two heat dissipating elements which are spacedly extended from said printed circuit board and are longitudinally supported along said upper and lower air channels respectively, wherein said two dissipating elements are adapted for transmitting heat from said printed circuit board; and a cooling fan electrically mounted on said printed circuit board at a position aligning with said air inlet for drawing exterior air through said air inlet to said lower air channel to create a first and a second air circulation path of said exterior air, wherein said first circulation path extends from said cooling fan to said air outlet at said lower air channel so as to allow said exterior air flowing into said first air circulation path to flow from said cooling fan to said air outlet in said lower air channel along a bottom side of said printed circuit board and one of said corresponding heat dissipating element, and said second air circulation path extends from said cooling fan to said air communication channel opposed to said air outlet in said lower air channel, and from said air communication channel to said air outlet such that said exterior air flowing through said second air circulation path is blown to flow from said cooling fan to said air communication channel in said lower air channel and then from said air communication channel to said air outlet in said upper air channel along an upper side of said printed circuit board and another of said corresponding heat dissipating element, such that said first and said second air circulation path is adapted to maximize a distance over which said heat is dissipated within a very confined space of said compact casing, and create a double cooling effect to said upper and said bottom side of said printed circuit board through dissipating heat by said heat dissipating elements and convection through said air outlet for maximizing an effectiveness and efficiency of heat dissipation within said compact casing.