Field Programmable Solder BGA for Non-Uniform Thermal Control

The patent divides the heating function into multiple independent heating zones corresponding to different regions of the solder ball array. Each heating zone can be controlled independently, allowing selective heating of specific areas rather than uniform global heating. This segmentation enables precise thermal management that avoids the thermal mass problems of traditional convection methods while maintaining reliable soldering.

The patent implements non-uniform temperature distribution across the substrate by providing different heating control parameters for different heating zones. Each zone can be heated to the specific temperature required for its local solder balls, creating optimal soldering conditions in each area without unnecessarily heating other regions. This local quality approach directly addresses the thermal mass control issue while ensuring package integrity.

The patent embeds control logic directly within the substrate or heating system, enabling the system to automatically manage its own heating processes. The embedded controller receives input parameters and autonomously regulates each heating zone without requiring external complex control systems. This self-service approach improves thermal control while minimizing the added complexity by making the system self-regulating.

The embedded control system is designed to handle multiple functions: temperature regulation, timing control, and coordination of multiple heating zones, all within a single integrated controller. This multi-functional design reduces overall device complexity compared to having separate control systems for each function, while still achieving superior thermal control and mitigating thermal mass challenges.