Dynamic Output Current Threshold Adjustment for Redundant Power Supplies
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Solution Overview
Problem
In redundant power supply configurations, the output conductor must be excessively large to handle the maximum combined current from multiple power supplies, which is undesirable due to the need for over-current protection and the potential for one supply to fail, leading to increased current demand.
Innovation Solution
Implementing dynamically adjustable output current thresholds for each power supply based on the operational status of the other supply, allowing the remaining supply to increase its output threshold to meet the load's current demand upon failure, thus reducing the required conductor size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the over-current threshold is set at the maximum current needs of the load to ensure reliability upon supply failure, then the power supply can handle the full load current when one supply fails, but the conductor must be excessively large to carry the combined maximum current from all supplies
Solution Approach 1:
The patent applies dynamics by making the over-current threshold adjustable rather than fixed. Each power supply dynamically changes its threshold based on the operational status of other supplies in the system. When one supply fails, the remaining supplies automatically increase their thresholds to accommodate the full load current, eliminating the need for oversized conductors designed for static maximum current scenarios
Solution Approach 2:
The patent changes the parameter of over-current threshold from a constant value to a variable that adapts to system conditions. By monitoring the status of other power supplies and adjusting the threshold parameter accordingly, the system optimizes conductor utilization while maintaining reliability. The threshold parameter is modified based on whether other supplies are operational, allowing the same conductor to safely handle both normal distributed current and emergency concentrated current
2Reliability
If the over-current threshold is set at approximately the maximum current needs of the load to handle potential failures, then the power supply can supply all current needed by the load upon failure of another supply, but during normal operation with both supplies operating, the current demand on each supply increases toward the threshold
Solution Approach 1:
The patent implements feedback by having each power supply monitor the operational status of other supplies and adjust its own over-current threshold accordingly. This closed-loop control ensures that during normal operation, thresholds are set appropriately for shared load, and upon detection of a failed supply, the remaining supplies receive feedback to increase their thresholds, maintaining reliability without unnecessary current limitations
Solution Approach 2:
The system dynamically adapts the over-current threshold based on real-time system conditions. During normal dual-supply operation, each supply operates at a lower effective threshold since the load is shared. Upon failure detection, the threshold dynamically increases to allow the single remaining supply to handle the full load current, optimizing both normal operation efficiency and failure response
Data Source
AI summary
A power supply comprises an alternating current-to-direct current converter (ADC) and an input signal adapted to couple to an output signal of another power supply. The output signal is indicative of the operational status of the other power supply. The power supply further comprises logic coupled to the ADC that receives the input signal and causes an output current threshold to be increased when the output signal from the other power supply indicates that the other power supply has experienced a failure.