Heat sink for electrical circuit components

An apparatus comprising a front plate having an outer side for receiving a plurality of electrical circuit components, a back plate secured to a side of said front plate opposite from said outer side of said front plate, said front plate and said back plate cooperating to define a plurality of passages disposed between said front and back plates for conducting a cooling medium, said plurality of passages including a first series of passages disposed between said front and back plates and extending from a first end portion of said front plate to a second end portion of said front plate, an inlet manifold passage connected in fluid communication with said first series of passages and disposed between said first end portion of said front plate and said back plate, a second series of passages disposed between said front and back plates and extending from the second end portion of said front plate to the first end portion of said front plate, a connector manifold passage connected in fluid communication with said first and second series of passages and disposed between said second end portion of said front plate and said back plate, and an outlet manifold passage connected in fluid communication with said second series of passages and disposed between said first end portion of said front plate and said back plate, and pump means mounted on one of said front and back plates for inducing a flow of cooling medium from said outlet manifold passage through said pump means to said inlet manifold passage, for inducing a flow of a cooling medium from said inlet manifold passage through said first series of passages to said connector manifold passage, and for inducing a flow of cooling medium from said connector manifold passage through said second series of passages to said outlet manifold passage.

An apparatus comprising a front plate having an outer side for receiving a plurality of electrical components, and a back plate secured to a side of said front plate opposite from said outer side of said front plate, said front plate and said back plate cooperating to define a plurality of passages disposed between said front and back plates for conducting a liquid cooling medium, said front plate and said back plate cooperating to define an expansion chamber disposed between said front and back plates for holding a gas which is compressible by the liquid cooling medium to accommodate expansion of the liquid cooling medium, said plurality of passages including an inlet manifold passage disposed between first end portions of said front and back plates and having a first length, a connector manifold passage disposed between second end portions of said front and back plates and having a second length which is greater than said first length, an outlet manifold passage disposed between the first end portions of said front and back plates and having a third length which is less than said second length, a first series of passages disposed between said front and back plates and extending from said inlet manifold passage to said connector manifold passage for conducting liquid cooling medium from said inlet manifold passage to said connector manifold passage, a second series of passages disposed between said front and back plates and extending from said connector manifold passage to said outlet manifold passage for conducting liquid cooling medium from said connector manifold passage to said outlet manifold passage, said expansion chamber being disposed between the second end portions of said front and back plates and having a length which is greater than said first and third lengths.