Method of manufacturing a PCB having improved cooling
View Patent ↗An improved cooling of an electronic component loaded to a printed circuit board, wherein the PCB comprises at its upper side at least one electronic component, and at least one heat conducting member inserted into a through-hole of the PCB, wherein the HCM extends from the upper side to the lower side of the PCB and has a thermal contact to the components.
1. Method for manufacturing a printed circuit board (PCB), the method comprising the steps of:
providing the PCB with at least one through-hole,
inserting a heat conductive member (HCM) into the through-hole, wherein the HCM comprises a substantially planar top portion and tapered or recessed bottom portion,
force fitting the HCM such that substantially only the areas turned away from the top side of the HCM are deformed, and
providing the PCB with an electrical component that is thermally coupled with the substantially planar top portion of the HCM, the HCM providing a heat-transmitting path from the substantially planar top portion to the tapered or recessed bottom portion.
2. The method according to claim 1 , wherein the press fitting is controlled by force.
3. The method according to claim 1 , comprising the steps of:
providing the HCM with an origin shape before it is force fitted into the through-hole, such that in the origin shape a distance between the top side of the HCM and the bottom side of the HCM is larger than a distance between the upper side of the PCB and the lower side of the PCB, and
performing the force fitting such that the HCM has a final shape after it is force fitted into the through-hole, such that in the final shape the distance between the top side and the bottom side of the HCM is substantially as big as the distance between the upper side and the lower side of the PCB.
4. The method according to claim 3 , wherein the origin shape of the HCM is chosen in at least one of the following ways:
such that the distance between top side and bottom side of the HCM is larger than the largest value of a manufacturing tolerance range for allowable distances between upper side and lower side of the PCB, and
such that after press fitting of the HCM into the through-hole a ring-shaped gap is provided between a bottom portion of the final shape of the HCM and an inner wall enclosing the through-hole.
5. The method according to claim 1 , wherein the HCM is provided with a ring-shaped bottom portion which has a truncated conical profile tapering with increasing distance from a disc-shaped top portion of the HCM.
6. The method according to claim 1 , wherein the force fitting of the HCM into the through-hole is provided by a pressing device comprising a first pressing tool arranged at one side of the PCB, and a second pressing tool arranged at the opposing side of the PCB, and wherein the second pressing tool supports the PCB, while the first pressing tool presses the HCM into the through-hole as long as the first pressing tool contacts the respective side of the PCB.
7. The method according to claim 6 , wherein the first pressing tool is provided with a centering mandrill projecting from the first pressing tool and penetrating into a center cavity of the HCM for aligning the HCM with the through-hole, and the centering mandrill is retracted into the first pressing tool before press fitting the aligned HCM into the through-hole.