Optimal Dummy Pattern Design Method for PWB Warpage Control Using the Human-Based Genetic Algorithm
Department of Mechanical System Design Engineering, Seoul National University of Science and Technology, Seoul 02421, Korea
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Micromachines 2020, 11(9), 807; https://doi.org/10.3390/mi11090807
Received: 11 June 2020
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Revised: 18 August 2020
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Accepted: 22 August 2020
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Published: 25 August 2020
(This article belongs to the Special Issue Polymer Processing for Microsystems)
In this work, a method that minimizes printed wiring board (PWB) warpage by dummy pattern design is proposed. This work suggests that dummy patterns are placed on a preset discretized location in the PWB to reduce the warpage. On each discretized candidate area, the dummy pattern can be set or unset. The warpage is numerically simulated based on direct modeling of the as-is PWB patterns to evaluate the warpage alongside the dummy pattern design set. The optimal pattern that minimizes warpage is determined using the human-based genetic algorithm where the objective function is evaluated by the structural simulation. The optimization method is realized in a spreadsheet that allows scripting language with which the input and output files of the simulation tool can be modified and read. Two different cases have been tested and the results show that the method can determine the optimal dummy patterns. The measured and simulated deflections agree well with each other. Moreover, it has been shown that certain dummy pattern designs that should reduce the warpage can be sought by the optimization.
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Keywords:
printed wiring board (PWB); warpage; genetic algorithm (GA); electronic package; simulation
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MDPI and ACS Style
Kim, S.K.; Lee, S.-H. Optimal Dummy Pattern Design Method for PWB Warpage Control Using the Human-Based Genetic Algorithm. Micromachines 2020, 11, 807. https://doi.org/10.3390/mi11090807
AMA Style
Kim SK, Lee S-H. Optimal Dummy Pattern Design Method for PWB Warpage Control Using the Human-Based Genetic Algorithm. Micromachines. 2020; 11(9):807. https://doi.org/10.3390/mi11090807
Chicago/Turabian StyleKim, Sun K., and Sang-Hyuk Lee. 2020. "Optimal Dummy Pattern Design Method for PWB Warpage Control Using the Human-Based Genetic Algorithm" Micromachines 11, no. 9: 807. https://doi.org/10.3390/mi11090807
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