Multi-node Fault Detection Circuit for Backplane Voltage Monitoring
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multi-node systems face challenges in detecting faults that occur between the power supply's overcurrent protection and the node's hot plug protection, such as short circuits in backplane connectors, which can cause undetected low impedance and significant energy consumption, leading to potential damage.
Innovation Solution
A fault detection circuit is implemented to monitor the voltage on the node's backplane connector prior to the input of the hot plug protection interface, detecting voltage drops below a threshold magnitude at a rate exceeding a threshold rate, and communicates the fault to power supplies to shut off their outputs and prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If overcurrent protection and hot plug protection are implemented, then basic fault protection is provided, but faults occurring between these protection interfaces remain undetected
Solution Approach 1:
A fault detection circuit is introduced as an intermediary component between the power supply output and the node input. This circuit monitors voltage drops on the backplane connector to detect faults that occur in the gap between existing protection interfaces, thereby extending fault coverage without requiring fundamental changes to the existing protection architecture
Solution Approach 2:
The fault detection circuit performs preliminary monitoring of voltage drops before faults can cause significant damage. By detecting voltage changes that indicate developing faults (such as partial shorts or impedance changes) before they escalate, the system can take preventive action through the controller to shut down power supplies and avoid catastrophic failures
2Reliability
If fault detection monitoring is added between protection interfaces, then undetected faults are identified, but system complexity and cost increase
Solution Approach 1:
The fault detection circuit is designed to be integrated into the existing power supply controller architecture, allowing the controller to serve multiple functions: normal power management, overcurrent protection, and fault detection. This multi-functionality reduces the need for completely separate monitoring systems and minimizes overall system complexity
Solution Approach 2:
The fault detection circuit provides continuous feedback about voltage conditions on the backplane connector to the controller. This feedback mechanism enables the controller to make real-time decisions about system state and initiate protective shutdowns when fault conditions are detected, creating a closed-loop protection system that responds dynamically to actual system conditions
3Reliability
If voltage monitoring is performed continuously, then faults are detected early, but energy consumption increases
Solution Approach 1:
The fault detection circuit performs voltage monitoring at periodic intervals rather than continuously. The controller samples the voltage on the backplane connector at defined rates that are sufficient to detect rapid voltage drops indicative of faults, while allowing the monitoring circuitry to enter lower-power states between sampling events, thus balancing detection speed with energy conservation
Data Source
AI summary
Examples disclosed herein relate to multi-node system fault management. In some of the examples disclosed herein, a fault detection circuit may distinguish between normal operating conditions of a multi-node system and faults that occur between the overcurrent protection of the system's power supplies and the hot plug protection of the system's nodes. The fault detection circuit may detect these faults by monitoring a voltage at the node's backplane connector prior to the input of the node's hot plug protection interface. If the magnitude of the monitored voltage drops below a threshold voltage at a rate that exceeds a threshold rate, the fault detection circuit may determine that a fault has occurred and may communicate the fault to the power supplies. The power supplies may receive the fault communication and shut off their power outputs to prevent the fault from causing damage to the components in the system.