Power Device Monitoring via Multi-Sensor Current Comparison
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Solution Overview
Problem
In power switching systems, it is challenging to accurately determine whether a fault state is caused by an external current or damage to a power semiconductor or internal circuit, as existing systems lack the necessary methods to differentiate between these conditions.
Innovation Solution
A monitoring system that includes sensors to measure currents and temperatures across power devices, with a control unit comparing these measurements to determine fault states by identifying differences between currents and applying correction based on temperature and voltage relationships, thereby distinguishing between external current introduction and device damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a current sensor is provided to monitor currents in a power switching system, then the ability to detect fault states is improved, but the ability to accurately determine whether the fault is caused by external current or device damage remains insufficient
Solution Approach 1:
The patent divides the monitoring function into multiple independent current sensors positioned at different locations in the power switching system. Each sensor monitors a specific current path, allowing the control unit to compare current values from different measurement points to determine whether a fault is caused by external current introduction or device damage. This segmentation of monitoring functions enables precise fault localization and cause identification.
2Reliability
If multiple current sensors are added to differentiate between external current and device damage, then fault diagnosis capability is improved, but system complexity increases
Solution Approach 1:
The control unit continuously receives current measurements from multiple sensors and compares these values in real-time. When a fault condition is detected, the control unit analyzes the current distribution pattern and provides feedback to determine the fault cause. This feedback mechanism enables reliable fault diagnosis without requiring complex additional hardware, as the existing sensor network is utilized efficiently through intelligent comparison and analysis algorithms.
Data Source
AI summary
The present disclosure relates to a monitoring system for a plurality of power devices serially connected in a main circuit of a current transmission path comprising a first power device and a second power device each including a semiconductor element; a first sensor connected to the first and second power devices, and which senses information related to a first current flowing in the first power device; a second sensor for sensing information related to a second current flowing in the second power device; a third sensor for sensing information related to a third current flowing between the first power device and the second power device; and a control unit for comparing the first current and the second current on the basis of the third current measured by the third sensor, and determining whether the state of each power device is abnormal based on a difference with the third current.