Rack-Scale Server Child Node Power Clamp Disengagement Detection
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Solution Overview
Problem
In rack-scale servers, abnormal power downs occur when a child node is pulled out without pressing the power switch, leading to direct voltage loss and potential damage to sensitive components due to reverse voltage, as the system lacks a 1+1 redundant power supply design.
Innovation Solution
A protection system incorporating a logic control module and a plugging/unplugging trigger module using a metal probe and level switching circuit to detect the disengagement of the power clamp from the copper bar, allowing for sequential shutdown of the main and standby power supplies, mimicking a normal power off sequence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a power supplying clamp is disengaged from the power supplying copper bar directly without pressing the power switch, then the child node server can be removed quickly, but the system powers down directly causing data loss and potential damage to sensitive components
Solution Approach 1:
The patent applies preliminary action by detecting the disengagement of the power supplying clamp before complete power loss occurs. The detection module monitors the contact state between the clamp and copper bar, and triggers the power supply module to shut down the power supply in advance, allowing the system to follow the normal power off time sequence and complete data storage operations before power is cut off.
2Reliability
If the 1+1 redundant power supply design is implemented in rack-scale servers, then data protection during power failure is improved, but the device complexity and cost increase
Solution Approach 1:
The patent applies self-service by enabling the existing power supply system to protect itself through automatic detection and control. The detection module monitors the clamp contact state and automatically triggers the power supply module to shut down the power supply when disengagement is detected, allowing the system to follow normal power off sequences without requiring redundant power supply hardware.
3Speed
If the power supply is shut down immediately when the clamp is disengaged, then the response time is reduced, but reverse voltage may damage sensitive electronic components
Solution Approach 1:
The patent applies feedback by using the detection module to continuously monitor the contact state between the power supplying clamp and copper bar. When disengagement is detected, the power supply module receives feedback and automatically shuts down the power supply, preventing reverse voltage generation while maintaining fast response time.
4Reliability
If the metal probe detection system is added to detect clamp disengagement, then abnormal power down is prevented, but the device complexity increases
Solution Approach 1:
The patent applies intermediary by introducing a metal probe as a simple detection element that bridges the gap between the mechanical clamp position and the electronic control system. The metal probe detects clamp disengagement and triggers the power supply module to shut down the power supply, providing protection with minimal added complexity.
Data Source
AI summary
A protection system for abnormal power down of a child node in a rack-scale server includes a logic control module and a plugging/unplugging trigger module. The plugging/unplugging trigger module is configured to detect a contact state, at a second plugging depth, between a power supplying clamp of the child node and the power supplying copper bar through a metal probe, generate a detection signal by conversion, and send the detection signal to the logic control module; the logic control module is configured to successively turn off a main power supply and a standby power supply of the child node after determining that the power supplying clamp is disengaged from the second plugging depth of the power supplying copper bar and before the power supplying clamp is disengaged from the third plugging depth of the power supplying copper bar, so as to execute power down logic of normal power off.