Power Supply Control Device Voltage Fluctuation Handling
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Solution Overview
Problem
Existing power supply control devices struggle to accurately determine an abnormal system when voltages of redundant power supply systems fluctuate around the abnormality determination threshold, particularly during half short-circuits or intermittent high load states, leading to uncertain system failure identification.
Innovation Solution
A power supply control device with a controller that executes a confirmation process based on voltage changes in both systems within a first period and, if uncertain, employs an estimation process to identify the system with a greater likelihood of being abnormal by analyzing voltage changes over a longer second period, using timers and counters to measure cumulative times and frequency of threshold violations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the power supply control device uses a simple voltage threshold comparison to determine abnormal systems, then the response speed is fast, but the determination accuracy deteriorates when voltages fluctuate around the threshold
Solution Approach 1:
The controller executes a confirmation process within a first period to preliminarily determine abnormal systems based on voltage threshold comparisons. When voltages fluctuate around the threshold and abnormal systems cannot be confirmed, the controller extends the determination period to a second period longer than the first period, accumulating voltage change data over time to make a more accurate determination. This preliminary action followed by extension resolves the contradiction by maintaining fast response when possible while improving accuracy when needed.
Solution Approach 2:
The determination mechanism dynamically adjusts the observation period based on voltage fluctuation characteristics. When voltages are stable relative to the threshold, the system uses the shorter first period for quick determination. When voltages fluctuate around the threshold causing uncertainty, the system transitions to the longer second period for more reliable determination. This dynamic adaptation resolves the contradiction between speed and accuracy.
2Measurement precision
If the power supply control device extends the determination period to improve accuracy, then the abnormal system identification becomes more reliable, but the response time increases
Solution Approach 1:
The system dynamically selects the determination period length based on real-time voltage fluctuation characteristics. When voltages fluctuate around the threshold, the system extends to the second period for accurate determination. When voltages are clearly above or below the threshold, the system uses the shorter first period. This dynamic selection minimizes unnecessary time extension while ensuring accuracy when needed.
Solution Approach 2:
The confirmation process within the first period serves as a preliminary assessment that resolves many cases quickly without requiring the full second period. Only when this preliminary assessment is inconclusive due to threshold fluctuations does the system proceed to the extended second period determination, thereby reducing overall time loss while maintaining accuracy.
3Device complexity
If the power supply control device uses a single determination threshold, then the control logic is simple, but the system cannot reliably distinguish abnormal conditions from transient fluctuations
Solution Approach 1:
The controller executes a confirmation process within a first period to preliminarily determine whether voltage changes indicate abnormal conditions. This preliminary action filters out transient fluctuations that occur within the shorter time frame. When abnormal systems cannot be confirmed in the first period, the controller extends to a second period longer than the first period for more reliable determination, thereby distinguishing true abnormalities from transient fluctuations while maintaining relatively simple control logic.
4Measurement precision
If the power supply control device monitors voltage continuously with high frequency, then the detection precision is high, but the energy consumption increases
Solution Approach 1:
The controller performs voltage monitoring and comparison operations periodically within defined periods (first period and second period) rather than continuously. The confirmation process checks voltage changes at discrete time points within the first period, and if inconclusive, extends to the second period. This periodic action maintains adequate detection precision for determining abnormal systems while reducing energy consumption compared to continuous high-frequency monitoring.
Data Source
AI summary
A power supply control device includes: a connection device provided in an inter-system line that connects a first system and a second system; and a controller configured to control the connection device. The controller is configured to control the connection device to cut off the inter-system line in response to a power supply failure of the first system or the second system being detected, execute a confirmation process for confirming a failed system based on changes in voltages of the first system and the second system in a first period, and execute, in a case where the failed system cannot be confirmed in the confirmation process, an estimation process for estimating, as an abnormal system, a system with a greater possibility to be abnormal, based on changes in voltages of the first system and the second system in a second period longer than the first period.