CPU Heatsink Ground Path for High-Current Power Delivery
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Solution Overview
Problem
As CPUs increase in speed and functionality, they require higher supply currents at lower operating voltages, leading to a higher pin count for power and ground delivery, which results in larger CPU packages and increased heat generation due to complex routing of power, ground, and signals.
Innovation Solution
The proposed solution involves a processor mounting stack-up that includes a heat sink, power delivery hat, and conductive stack gasket, which securely affixes the CPU to a PCB, efficiently routing power and ground currents through dedicated pads and compression rings to manage heat and signal quality, using a multilayer substrate with interconnected signal, ground, and power layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If higher supply currents are used to increase CPU speed and functionality, then CPU performance is improved, but heat generation increases
Solution Approach 1:
The patent extracts the ground delivery function from the traditional PCB routing and relocates it to the heatsink structure. By forming ground contacts directly on the heatsink that engage with ground pads on the CPU substrate, the invention separates ground delivery from thermal management into distinct but integrated functions, reducing heat generation in routing paths while maintaining CPU performance
Solution Approach 2:
The heatsink is designed to serve multiple functions simultaneously: thermal management (cooling the CPU), electrical grounding (providing ground delivery paths), and mechanical support (securing the CPU to the PCB). This multi-functionality reduces the need for separate components and routing paths, thereby reducing overall heat generation and improving efficiency
2Speed
If higher pin count is used for power and ground delivery, then CPU performance is improved, but device complexity increases
Solution Approach 1:
The patent merges the ground delivery function with the thermal management function by integrating ground contacts into the heatsink structure. This consolidation eliminates the need for separate ground routing paths on the PCB, reducing routing complexity while maintaining the necessary pin count for high-performance CPU operation
Solution Approach 2:
The heatsink acts as an intermediary component that provides direct electrical connection between the CPU ground pads and the PCB ground contacts. This intermediary structure simplifies the overall routing by creating a dedicated ground path that bypasses complex PCB trace routing, thereby reducing device complexity
Data Source
AI summary
An information handling system includes a PCB, a CPU, a power distribution hat, and a heat sink. The PCB includes a first power contact on a first surface of the PCB and a first ground contact on a second surface of the PCB. The CPU includes a substrate and is affixed and electrically coupled to the first surface of the PCB by a first surface of the substrate. A second surface of the substrate includes a second power contact and a second ground contact. The power distribution hat couples the first power contact with the second power contact. The heat sink couples the first ground contact with the second ground contact.