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A cooling structure for electrical circuit devices having a pair of cooling ducts, each having a coolant passageway therein, and an electrical circuit device housing formed by a pair of spaced apart heat transfer plates each joined to a housing side to provide a sealed housing space. An electrical c

A cooling structure for electrical circuit devices having a pair of cooling ducts, each having a coolant passageway therein, and an electrical circuit device housing formed by a pair of spaced apart heat transfer plates each joined to a housing side to provide a sealed housing space. An electrical circuit device is positioned in that sealed housing space and each of the pair of heat transfer plates is positioned adjacent to, and thermally coupled to, a corresponding one of the pair of cooling ducts. An electrically insulative heat transfer material is provided in the sealed housing space so as to be capable of being in contact with the electrical circuit device also therein.

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The invention claimed is: 1. A cooling structure for electrical circuit devices positioned therein that dissipate energy as heat during operation of electrical circuits in which such devices are electrically connected, the cooling structure comprising: a pair of cooling ducts each having a passagew

The invention claimed is: 1. A cooling structure for electrical circuit devices positioned therein that dissipate energy as heat during operation of electrical circuits in which such devices are electrically connected, the cooling structure comprising: a pair of cooling ducts each having a passageway therein formed by passageway walls thereabout and through each of which a coolant can selectively be caused to flow to transport heat away from the cooling structure, an electrical circuit device housing formed by a pair of spaced apart heat transfer plates each joined to a housing side extending between them to provide a sealed housing space in which at least one of the electrical circuit devices is positioned and with each of the heat transfer plates in the pair thereof positioned adjacent to, and thermally coupled to, a corresponding one of the cooling ducts in the pair thereof, and an electrically insulative heat transfer material provided in the sealed housing space so as to be capable of being in contact with at least one of the heat transfer plates in the pair thereof and the one or more electrical circuit devices positioned therein. 2. The cooling structure of claim 1 wherein the electrically insulative heat transfer material is a liquid. 3. The cooling structure of claim 2 further comprising the electrically insulative heat transfer material having a plurality of electrically insulative, thermally conductive particles dispersed therein. 4. The cooling structure of claim 1 wherein the electrically insulative heat transfer material is a gel. 5. The cooling structure of claim 4 further comprising the electrically insulative heat transfer material having a plurality of electrically insulative, thermally conductive particles dispersed therein. 6. The cooling structure of claim 1 wherein the electrical circuit device is joined to one of the pair of heat transfer plates. 7. The cooling structure of claim 6 wherein the electrically insulative heat transfer material is a liquid. 8. The cooling structure of claim 7 further comprising the electrically insulative heat transfer material having a plurality of electrically insulative, thermally conductive particles dispersed therein. 9. The cooling structure of claim 6 wherein the electrically insulative heat transfer material is a gel. 10. The cooling structure of claim 9 further comprising the electrically insulative heat transfer material having a plurality of electrically insulative, thermally conductive particles dispersed therein. 11. A cooling structure for electrical circuit devices positioned therein that dissipate energy as heat during operation of electrical circuits in which such devices are electrically connected, the cooling structure comprising: a pair of cooling ducts each having a passageway therein formed by passageway walls thereabout and through each of which a coolant can selectively be caused to flow to transport heat away from the cooling structure, an electrical circuit device housing formed by a pair of spaced apart heat transfer plates each joined to a housing side extending between them to provide a sealed housing space in which at least one of the electrical circuit devices is positioned and with each of the heat transfer plates in the pair thereof positioned adjacent to, and thermally coupled to, a corresponding one of the cooling ducts in the pair thereof, there being a finned structure having a plurality of spaced apart fin members on one side thereof relatively close to the electrical device and having the other side thereof joined with one of the pair of heat transfer plates, and an electrically insulative heat transfer material provided in the sealed housing space so as to be capable of being in contact with at least one of the heat transfer plates in the pair thereof and the one or more electrical circuit devices positioned therein. 12. The cooling structure of claim 11 wherein the electrically insulative heat transfer material is a liquid. 13. The cooling structure of claim 12 further comprising the electrically insulative heat transfer material having a plurality of electrically insulative, thermally conductive particles dispersed therein. 14. The cooling structure of claim 11 wherein the electrically insulative heat transfer material is a gel. 15. The cooling structure of claim 14 further comprising the electrically insulative heat transfer material having a plurality of electrically insulative, thermally conductive particles dispersed therein. 16. The cooling structure of claim 11 wherein the electrical circuit device is joined to the remaining one of the pair of heat transfer plates not joined with the finned structure. 17. A cooling structure for electrical circuit devices positioned therein that dissipate energy as heat during operation of electrical circuits in which such devices are electrically connected, the cooling structure comprising: a pair of cooling ducts each having a passageway therein formed by passageway walls thereabout and through each of which a coolant can selectively be caused to flow to transport heat away from the cooling structure, an electrical circuit device housing formed by a pair of spaced apart heat transfer plates each joined to a housing side extending between them to provide a sealed housing space in which at least one of the electrical circuit devices is positioned and with each of the heat transfer plates in the pair thereof positioned adjacent to, and thermally coupled to, a corresponding one of the cooling ducts in the pair thereof, such that one of the heat transfer plates in the pair thereof is positioned adjacent to a corresponding one of the cooling ducts in the pair thereof and has the thermal coupling therebetween provided at least in part by a thermal grease located therebetween, and an electrically insulative heat transfer material provided in the sealed housing space so as to be capable of being in contact with at least one of the heat transfer plates in the pair thereof and the one or more electrical circuit devices positioned therein.