CPU Power Delivery Stack-Up Using Heatsink Ground Routing
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Solution Overview
Problem
As CPUs require higher supply currents at lower operating voltages and increased pin counts for power and ground delivery, existing information handling systems face challenges in efficiently routing power and ground connections, leading to increased complexity and heat generation.
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, ensuring reliable power and ground delivery through dedicated power and ground pad rings, and heat sink mounting bolts, thereby managing heat and signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If higher supply currents are used to meet increased CPU power demands, then power delivery capability is improved, but heat generation increases
Solution Approach 1:
The power delivery system is segmented into multiple independent power contacts and ground contacts, with dedicated power distribution paths through the power distribution hat and separate thermal management through the heat sink. This segmentation allows independent optimization of power delivery and heat dissipation pathways.
Solution Approach 2:
The heat sink acts as an intermediary component that couples ground contacts thermally while electrically isolating them. This intermediary structure provides a dedicated thermal conduction path from the CPU substrate ground contacts to the PCB ground plane, separating the thermal management function from the electrical power delivery function.
2Reliability
If increased pin counts are used for power and ground delivery, then power delivery reliability is improved, but device complexity increases
Solution Approach 1:
The power distribution hat serves multiple functions simultaneously: it provides mechanical support for the CPU, establishes electrical connections between power contacts, and creates dedicated thermal pathways. The heat sink similarly serves both thermal management and electrical grounding functions, reducing the need for separate dedicated components.
Solution Approach 2:
The patent merges the power distribution function and thermal management function into an integrated stack-up structure. The power distribution hat and heat sink are combined in a single assembly that handles both electrical power delivery and thermal dissipation, simplifying the overall system architecture despite the high pin count requirements.
3Reliability
If dedicated power and ground pathways are implemented, then signal quality is improved, but manufacturing complexity increases
Solution Approach 1:
The patent transitions from planar PCB routing to a three-dimensional stacked architecture. Power and ground connections are established vertically through the CPU substrate, power distribution hat, and heat sink assembly, rather than through complex lateral PCB traces. This dimensional change simplifies the manufacturing process while maintaining dedicated pathways.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively addresses the complexity of high-pin-count CPU power delivery by ensuring equal current capacity for ground and power pads, reducing heat generation, and improving signal quality through localized and efficient power and ground routing.
Implementation Method 1
The heat sink may couple the first ground contact with the second ground contact
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.