Voltage Sensing Circuit with Diode Decoupling for Dipole Measurement
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Solution Overview
Problem
Conventional methods for determining the state of a two-state dipole, such as IGBTs, face accuracy issues due to isolation components that reduce voltage measurement accuracy and are affected by temperature coefficients, leading to offset voltage measurements.
Innovation Solution
A voltage measurement system with a reference and measurement terminal, an isolation circuit, and a compensation circuit, which includes diodes to decouple the measurement terminal from the compensation circuit based on dipole voltage, allowing for accurate estimation of dipole voltage by measuring voltages across two measurement paths and compensating for temperature effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If isolation components are used to withstand high voltage of the dipole, then the dipole can operate in high voltage state, but the accuracy of voltage measurement is reduced
Solution Approach 1:
The patent introduces an intermediary measurement circuit that includes isolation components (such as resistors and operational amplifiers with isolation) positioned between the high voltage dipole and the measurement system. This intermediary circuit buffers the high voltage while providing a scaled-down, isolated signal to the measurement ADC, thus protecting the measurement system while maintaining measurement accuracy through proper circuit design and isolation techniques.
2Ease of operation
If conventional measurement methods are used to determine dipole state, then the system can detect the ON state, but temperature coefficients cause voltage offset in measurements
Solution Approach 1:
The patent compensates for temperature effects by introducing temperature compensation circuits that adjust measurement parameters based on detected temperature. The system uses temperature sensors to monitor the thermal state and dynamically adjusts the measurement circuit parameters (such as reference voltages or amplifier gains) to compensate for temperature-induced drift, thereby maintaining accurate voltage measurements across varying temperatures.
Solution Approach 2:
The patent implements feedback mechanisms where temperature sensors continuously monitor the thermal conditions of the measurement circuit and feed this information back to adjustment circuits. This feedback loop enables real-time compensation of temperature coefficients, allowing the system to maintain accurate voltage measurements despite temperature variations by automatically adjusting measurement parameters based on the detected temperature state.
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
The system provides accurate overcurrent detection, health monitoring, increased resolution, and reliability of voltage sensing, while reducing costs by minimizing the impact of temperature coefficients and isolation component limitations.
Implementation Method 1
The isolation circuit having one or more diodes. The cathodes of the one or more diodes are electrically coupled to the measurement terminal.
Data Source
AI summary
Systems and methods are provided to measure a voltage across a two-state dipole. The systems and methods measure voltages across two measurement paths of operational circuitry at first and second sensor terminals. The operational circuitry is configured to decouple the first and second sensor terminal based on a dipole voltage. The systems and methods further estimate the dipole voltage based on the voltages of the two measurement paths.