Processor Power Supply Droop Slope Detection for Early Throttling
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Solution Overview
Problem
Existing power supply systems in data centers face challenges in maintaining minimum input voltage levels for processors during high workload conditions, leading to potential shutdowns due to voltage droops, which are not effectively addressed by current methods that rely on continuous sensing and delayed throttling, resulting in increased capacitance and cost.
Innovation Solution
Implementing a slope detector circuit to sense the rate of voltage droop, allowing for early throttling by reducing core frequency when the droop rate exceeds a reference slope, thereby reducing capacitance requirements and enabling higher core switching frequencies without collapsing the supply voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If decoupling capacitances are increased to meet output voltage regulation, then voltage droop is reduced, but device area and cost increase
Solution Approach 1:
The patent implements early detection of voltage droop using a slope detector that monitors the rate of voltage change. By detecting droop conditions before they cause system failure, the system can take preventive action (throttling) earlier in the process, avoiding the need for excessive capacitance to compensate for delayed response.
Solution Approach 2:
The patent replaces the passive mechanical approach of using large capacitance values to suppress voltage droop with an active detection and control system. The slope detector circuit actively monitors voltage changes and triggers throttling based on detected droop rates, substituting the need for large energy-storing capacitance components.
2Reliability
If motherboard PCB metal trace and on-die metallization are increased to reduce impedance, then voltage droop is reduced, but manufacturing cost and area increase
Solution Approach 1:
The patent substitutes the physical approach of reducing impedance through larger metallization with an electrical detection and control approach. The slope detector monitors voltage droop rates and triggers throttling before voltage collapse occurs, eliminating the need for expensive low-impedance PCB traces and on-die metallization.
Solution Approach 2:
The patent introduces a slope detector circuit as an intermediary between the power supply and processor. This detector mediates the interaction by providing early warning of voltage droop conditions, allowing the system to adjust processor operation before critical voltage levels are reached, without requiring physical modifications to the power delivery path.
3Measurement precision
If continuous voltage sensing is implemented, then voltage droop detection is improved, but response time is delayed due to processing overhead
Solution Approach 1:
The slope detector continuously monitors the rate of voltage change and compares it against a reference slope threshold. By detecting the rate of change rather than waiting for absolute voltage thresholds to be reached, the system takes preliminary action before voltage collapse occurs, significantly reducing response time while maintaining detection accuracy.
Solution Approach 2:
The patent changes the detection parameter from monitoring absolute voltage levels to monitoring the rate of voltage change (slope). This parameter transformation allows the system to detect impending voltage droop conditions earlier and respond more quickly, as the slope changes before the voltage itself reaches critical levels.
Data Source
AI summary
An apparatus includes a circuit to generate a clock having a period with a duty cycle less than or equal to 90%, and logic to determine a difference in an input voltage between a first time and a second time, at least in part based on the duty cycle of the clock, and to produce a first signal, at least in part based on the difference in the input voltage and a first predetermined threshold.