Stationary cooling structure for board/chassis-level conduction cooling
The present disclosure relates to a cold plate and vapor chamber for conduction cooling of one or more printed circuit boards in a printed circuit board (PCB) enclosure. The cold plate may include a planar surface at an oblique angle relative to an axis along which the PCB assembly is inserted into the enclosure. The PCB assembly may include a vapor chamber having a complementary obliquely angled surface. The complementary angled surfaces of the cold plate and vapor chamber may exert forces against each other upon insertion of the printed circuit board assembly into the enclosure and contact between the cold plate and vapor chamber.
1. An enclosure for housing one or more printed circuit board assemblies inserted in an insertion direction into one or more bays of the enclosure, the enclosure comprising:
a cold plate, fixedly attached to a surface of a bay of the one or more bays, the cold plate comprising a first surface for conducting heat, the first surface of the cold plate provided at an oblique angle with respect to the insertion direction; and
a vapor chamber formed in a printed circuit board assembly of the one or more printed circuit board assemblies, the vapor chamber comprising a first surface for conducting heat, the first surface of the vapor chamber provided at an angle complementary to the oblique angle of the first surface of the cold plate, the first surface of the cold plate coming together against the first surface of the vapor chamber upon insertion of the printed circuit board assembly into the bay, the complementary angles of the first surface of the vapor chamber and the first surface of the cold plate enabling a contact force between the first surfaces of the cold plate and vapor chamber upon insertion of the printed circuit board assembly into the bay and contact between the first surfaces of the cold plate and vapor chamber, the contact force promoting heat conduction.
2. The enclosure of claim 1 , the guide rails configured to constrain the printed circuit board assembly to move in a first direction into the bay and a second direction toward the cold plate.
3. The enclosure of claim 1 , further comprising a thermally conductive sheet affixed to the cold plate for providing tolerance with respect to the contact between the first surfaces of the cold plate and the printed circuit board assembly.
4. The enclosure of claim 1 , further comprising:
a backplane in the enclosure; and
a socket on the printed circuit board assembly, full insertion of the printed circuit board assembly establishing electrical contact between the socket and the backplane.
5. The enclosure of claim 4 , wherein the contact between the first surfaces of the cold plate and vapor chamber occurs at a same time as the socket establishes electrical contact with the back plane or after the socket establishes electrical contact with the back plane.
6. The enclosure of claim 1 , further comprising:
a backplane in the enclosure; and
a socket on the printed circuit board assembly, insertion of the printed circuit board assembly to a first insertion point establishing electrical contact between the socket and the backplane, and contact between the socket and backplane providing a hard stop preventing insertion of the printed circuit board assembly past a second insertion point, the contact between the first surfaces of the cold plate and vapor chamber occurring at or between the first and second insertion points of the printed circuit board assembly.
7. The enclosure of claim 1 , further comprising:
guide rails in opposed side walls of the bay; and
guide pins on opposed sides of the printed circuit board assembly, the guide pins in the guide rails guiding the printed circuit board assembly into the bay.
8. The enclosure of claim 7 , the guide rails configured to constrain the printed circuit board assembly to move in a first direction into the bay and a second direction toward the cold plate.
9. The enclosure of claim 8 , the guide rails configured to constrain the printed circuit board assembly to move in the first direction into the bay until a component extending away from the printed circuit board assembly toward the cold plate clears the cold plate upon insertion in the insertion direction, and the guide rails configured to constrain the printed circuit board assembly to move in the second direction toward the cold plate after the component clears the cold plate.
10. The enclosure of claim 7 , the guide rails configured to constrain the printed circuit board assembly to move in the single insertion direction into the bay.
11. The enclosure of claim 1 , the contact between the first surfaces of the cold plate and vapor chamber occurring at one of a same time as, before or after, the socket establishing electrical contact with the back plane.