Hot-Swap Circuitry Ground Detection and Hierarchical Startup
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Solution Overview
Problem
Hot-swappable circuit boards with sensitive integrated circuit chips are prone to damage from voltage spikes and electrical transients during the remove-and-replace process, requiring protective measures to avoid damage.
Innovation Solution
The implementation of on-board circuitry that detects electrical ground connections and stable power to initiate a hierarchical startup of voltage regulators, configuring programmable devices and ensuring stable output power, thereby protecting the circuitry from transient-related damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hot-swappable circuit boards are designed to allow removal and replacement without power-down, then operational continuity is improved, but sensitivity to voltage spikes and electrical transients increases
Solution Approach 1:
The patent implements preliminary detection of ground connection and stable power conditions before initiating the startup sequence of voltage regulators and programmable devices. This preliminary action ensures that the circuit board is only activated when electrical conditions are safe, preventing damage from voltage spikes while maintaining hot-swappable operational continuity
Solution Approach 2:
The patent introduces intermediary detection circuits that monitor ground connection and power stability before enabling the main circuitry. These intermediary circuits act as mediators between the power source and sensitive integrated circuits, filtering out harmful electrical transients while allowing legitimate power delivery
2Reliability
If voltage regulators are started up in hierarchical sequence, then protection from electrical transients is improved, but startup time increases
Solution Approach 1:
The patent performs preliminary detection of ground and power stability before initiating the hierarchical startup sequence. This preliminary validation ensures that the sequential startup can proceed without delays caused by electrical instability, maintaining both reliability and efficient timing
Solution Approach 2:
The patent implements periodic monitoring of power stability during the hierarchical startup sequence of voltage regulators. This periodic action allows the system to verify electrical conditions at each stage of the startup process, ensuring protection while maintaining a predictable and optimized startup timeline
Data Source
AI summary
Electronic circuits and methods are provided for use in hot-swappable circuit board applications. Circuitry detects an electrical ground connection and signals operation of a hot-swap controller. Detection of stable operating power causes a hierarchical startup of plural voltage regulators. Sensing stable output power from the last of the voltage regulators triggers the configuration of one or more programmable devices. Circuitry and other resources of a hot-swappable circuit board are protected against electrical transient-related damage by virtue of the present teachings.