Cold plate optimization design method for heat dissipation of large-size flexible printed circuit board

[0030] Embodiment 1: A cold plate optimization design method for heat dissipation of large-size flexible printed boards, including the following steps:

[0031] Step 1: Measure the coordinate values ​​of n points on the printed board. The n points are mainly distributed around the heat source device, and the number n is not less than 100. The coordinate values ​​(xi, yi, zi) of each point can be passed through the coordinate system Or measured by a laser scanner, draw a three-dimensional model using three-dimensional software based on the coordinate values ​​of n points, and import the wiring distribution model of the printed board and the heat source device model into the three-dimensional model to form the initial state model of the printed board; the heat source device The number can be set by yourself. In this embodiment, the heat source devices are three types: CPU with high power consumption, network chip with medium power consumption, and power conversion module with low power

[0035] Embodiment 2: Different from embodiment 1, after step 3, there is also step 4: calculating the temperature difference △T between the heat source device and the cold plate in step 3, the △T calculation formula is: (L_power / (K_power*S_power) + L_tim / (K_tim*S_tim))*W, where L stands for distance, S stands for contact area, K stands for thermal conductivity, subscript power stands for heat source, subscript tim stands for heat transfer medium, and then according to the temperature difference △T and the allowable value of the heat source device Use the temperature T_max to calculate the surface temperature T_cp of the cold plate at different positions. The calculation formula is T_max – △T. The cold plate runner is designed to optimize the cold plate runner according to the temperature T_cp of the cold plate. The cold plate runner preferentially adopts a combination of multiple enhanced heat exchange runners , It is beneficial for more reasonable heat exchange and cold plate

[0040] Embodiment 3: Different from Embodiment 2, the optimization method of the cold plate runner in step 4 also includes step 4.4: Calculate the cold plate runner flow resistance P, and compare it with the flow resistance requirements proposed by the user. The formula for calculating the flow resistance P of the cold plate runner is: , Where P represents the flow resistance, n1~5 represents the number of the above five kinds of flow channels, and Q represents the flow. This step further optimizes the internal flow channel of the cold plate to meet the flow resistance P requirements of some users.