Dual-Threshold Relay Control for Short-Circuit Shutdown
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Solution Overview
Problem
Existing relay technologies do not adequately address short circuits of varying scales, failing to appropriately turn off relays in response to both large and small short circuits.
Innovation Solution
A relay device with a control unit that executes hardware-based and software-based OFF control, using multiple threshold voltages to determine when to turn off the relay, ensuring appropriate response to both large and small short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single threshold voltage is used for relay OFF control, then the control logic is simple, but the relay cannot appropriately respond to both large and small scale short circuits
Solution Approach 1:
The patent segments the short circuit detection into two distinct threshold levels: a first threshold voltage for large-scale short circuits and a second threshold voltage for small-scale short circuits. This segmentation allows the system to differentiate between different severity levels of short circuits and apply appropriate response strategies for each, thereby improving reliability without excessive complexity increase.
Solution Approach 2:
The patent changes the voltage threshold parameter from a single fixed value to multiple variable thresholds (first threshold and second threshold). By adjusting these threshold parameters, the system can adapt its detection sensitivity to match different short circuit scales, enabling reliable detection across varying conditions while maintaining manageable control logic through structured comparison operations.
2Speed
If hardware-based OFF control with low threshold is used, then large short circuits are detected quickly, but small short circuits may cause false triggering
Solution Approach 1:
The patent implements dynamic threshold selection where the first threshold voltage is used for rapid detection of large-scale short circuits, while the second threshold voltage serves as a higher confirmation level to prevent false triggering from small-scale anomalies. The control unit dynamically switches between these thresholds based on the detected voltage level, achieving both fast response and high reliability.
Solution Approach 2:
The second threshold voltage acts as an intermediary mechanism between the fast but sensitive first threshold detection and the final relay OFF decision. When the first threshold is exceeded, the system uses the second threshold as an additional verification step, ensuring that only genuine large-scale short circuits trigger the relay OFF action, thereby reducing false positives while maintaining detection speed.
Data Source
AI summary
A relay device is provided with a first terminal electrically connected to a first target, a second terminal electrically connected to a second target, a relay configured to switch on/off of an electrical connection between the first terminal and the second terminal, and a control unit configured to perform ON/OFF control of the relay. The control unit executes, by hardware, first OFF control for comparing a first voltage of the first terminal with a first threshold voltage, and turning off the relay based on a result of the comparison. The control unit executes, by software, second OFF control for comparing the first voltage with a second threshold voltage higher than the first threshold voltage, and turning off the relay based on a result of the comparison.