Power Supply Control Device Open Short Circuit Detection
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Solution Overview
Problem
Existing power supply control devices struggle to easily detect open circuits at the current output end of a switch and short circuits between the current input and output ends, as they cannot differentiate between these fault conditions when both switches are OFF.
Innovation Solution
Incorporating a resistor with one end connected to the current output end of the switch and a voltage applied to the other end, with comparison units to differentiate between open and short circuit conditions by comparing output end voltage values with specific threshold values, allowing for easy detection of faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single voltage detection method is used to detect both open circuit and short circuit conditions, then the detection system is simple, but the detection accuracy is insufficient because the same voltage value appears in both fault conditions
Solution Approach 1:
The single voltage detection method is segmented into two separate detection methods: first voltage detection (comparing output end voltage with first threshold) for open circuit detection, and second voltage detection (comparing output end voltage with second threshold) for short circuit detection. This segmentation allows each detection method to be optimized for its specific fault type, improving overall detection accuracy while maintaining system simplicity through dedicated detection paths.
Solution Approach 2:
Two different threshold values are introduced as intermediaries to differentiate between open circuit and short circuit conditions. The first threshold value is used as an intermediary for open circuit detection, and the second threshold value is used as an intermediary for short circuit detection. These threshold intermediaries enable the system to distinguish between fault types that would otherwise produce identical voltage readings.
2Measurement precision
If the detection thresholds are set to differentiate between fault conditions, then detection accuracy improves, but the system becomes more complex with multiple comparison units
Solution Approach 1:
The voltage detection unit is designed with multi-functionality, serving both open circuit detection and short circuit detection purposes. By configuring the same voltage detection unit to perform both first voltage detection and second voltage detection with different threshold comparisons, the system achieves fault differentiation without requiring separate detection hardware for each fault type, thus improving precision while controlling complexity.
3Reliability
If continuous monitoring is performed to ensure reliable fault detection, then detection reliability is high, but power consumption increases
Solution Approach 1:
Instead of continuous monitoring, the system employs periodic voltage detection at specific timing points. The control unit performs voltage detection at predetermined intervals or under specific operating conditions, which maintains adequate detection reliability while significantly reducing power consumption compared to continuous monitoring. This periodic action allows the system to balance reliability requirements with energy efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables easy detection of open circuits and short circuits by comparing output end voltage values with first and second threshold values, reducing power consumption and improving fault notification accuracy.
Implementation Method 1
a first comparison unit configured to compare an output end voltage value at the current output end with a first threshold value
Implementation Method 2
a second comparison unit configured to compare an end-to-end voltage value across the two ends of the switch with a second threshold value
Data Source
AI summary
If a main switch and a sub-switch are OFF and ON respectively, a comparator compares a source voltage value of the main switch to an output voltage value of a direct-current power source. In the same case, the comparator compares an end-to-end voltage value between a source and a drain of the main switch to a threshold value. A voltage value of the voltage applied to one end of the sub-switch is lower than the voltage value at the drain of the main switch. The output voltage value of the direct-current power source is lower than the voltage value. The threshold value is lower than the difference between the voltage value at the drain of the main switch and the voltage.