Semiconductor Switch Assembly Monitoring for High-Voltage State Detection
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Solution Overview
Problem
Existing monitoring systems for electrical components in energy systems, such as those in electric drive systems of electrically driven vehicles, struggle with precise voltage measurement at high voltage levels and are costly, lacking the ability to compensate for temperature-related resistance changes and requiring complex calibration.
Innovation Solution
A monitoring assembly using symmetrically designed voltage dividers with a corrective factor to compensate for resistance deviations, allowing precise voltage measurement and differentiation between critical and non-critical failure conditions, while minimizing computational load and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional monitoring systems are used for high voltage measurement, then voltage measurement capability is provided, but measurement precision deteriorates and cost increases
Solution Approach 1:
The patent changes the measurement parameters by using two voltage dividers with different resistance configurations to measure the same voltage at different scaling factors. By comparing the two measurement results and applying a corrective factor, the system achieves high-precision measurement without requiring expensive high-precision resistors or instrumentation amplifiers. This parameter transformation approach resolves the contradiction between measurement precision and manufacturing cost.
2Reliability
If temperature compensation is implemented, then measurement reliability is improved, but device complexity increases
Solution Approach 1:
The system performs self-temperature compensation by automatically determining corrective factors that account for temperature-related resistance changes in the voltage dividers. The control unit continuously monitors and adjusts the measurement by comparing the two voltage divider outputs and applying the appropriate corrective factor, eliminating the need for external temperature sensors or manual calibration procedures. This self-service mechanism improves reliability while maintaining relatively simple device architecture.
3Measurement precision
If calibration procedures are performed, then measurement accuracy is improved, but productivity decreases
Solution Approach 1:
The patent implements preliminary action by pre-determining corrective factors that compensate for systematic errors in the voltage dividers. These corrective factors are established beforehand and stored in the control unit, allowing the system to perform accurate measurements without requiring time-consuming calibration procedures during operation. This preliminary preparation resolves the contradiction between measurement accuracy and productivity by eliminating repeated calibration steps.
Data Source
AI summary
The invention relates to a monitoring assembly for an electrical component, a semiconductor switch assembly having a monitoring function, and an energy system. An analysis unit (50) of the semiconductor switch assembly is configured to determine on the basis of a first voltage divider (20), a second voltage divider (25), and a measuring device (40), a short circuit and/or a deviation from desired switched states in a first semiconductor switch (10) having a first inverse diode and a second semiconductor switch (15) having a second inverse diode, the semiconductor switches (10, 15) being connected in series between an input terminal (30) and an output terminal (32) of the semiconductor switch assembly, in such a way that the inverse diodes thereof are arranged anti-serially. In addition, the semiconductor switch assembly is configured to determine, on the basis of a first switch (S1) and a second switch (S2), a corrective factor for establishing a balance between the first voltage divider (20) and the second voltage divider (25).