Load Impedance Calculation Under Accuracy-Reducing Events
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Solution Overview
Problem
Traditional systems face challenges in accurately computing load impedance due to asynchronous measurements of current and voltage, which are affected by measurement accuracy-reducing events.
Innovation Solution
A system comprising a first and second controller communicatively coupled via a bidirectional channel, where the second controller drives a load with a target current signal, samples load voltage at a slower rate than electrical transients, calculates resistance based on current and voltage, and communicates this information to the first controller at intervals slower than transients, detecting and modifying data during accuracy-reducing events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If asynchronous measurements of current and voltage are used to compute load impedance, then the measurement process is simplified and can be implemented with basic sensors, but the accuracy of impedance calculation is reduced due to timing mismatches and measurement accuracy-reducing events
Solution Approach 1:
The system performs preliminary actions by detecting accuracy-reducing events before they significantly degrade the measurement, and by pre-calculating compensation factors based on detected events. The controller proactively adjusts measurement timing or compensation algorithms in advance to maintain accuracy without requiring complex real-time correction systems.
Solution Approach 2:
The system changes measurement parameters dynamically based on detected accuracy-reducing events. When events are detected, the controller adjusts sampling rates, timing offsets, or compensation parameters to compensate for the degradation, thereby maintaining impedance calculation accuracy despite the simplified asynchronous measurement approach.
2Measurement precision
If current and voltage are sampled at high rates to capture electrical transients, then measurement accuracy is improved, but the data processing burden and power consumption increase significantly
Solution Approach 1:
The system applies partial action by sampling current and voltage at rates sufficient to capture the essential characteristics needed for resistance calculation, rather than continuously at maximum rates. The controller determines appropriate sampling intervals that provide adequate measurement accuracy while avoiding excessive data collection that would waste power and processing resources.
Solution Approach 2:
The system extracts only the necessary measurement data points needed for accurate resistance calculation, rather than processing all high-rate samples. By identifying and extracting key measurement moments when transients occur or when measurements are most informative, the system achieves adequate accuracy with reduced sampling rates and lower power consumption.
3Productivity
If measurements are taken at a slower rate to reduce processing requirements, then power consumption and complexity are reduced, but the ability to accurately capture electrical transients is compromised
Solution Approach 1:
The controller implements feedback by monitoring the load state and detecting when transients or accuracy-reducing events occur. Based on this feedback, the system dynamically adjusts the measurement sampling rate, increasing it during transient events to maintain reliability and reducing it during steady-state operation to improve processing efficiency and reduce power consumption.
Solution Approach 2:
The measurement system transitions from a static fixed sampling rate to a dynamic adaptive sampling rate. The controller adjusts measurement timing and rate based on real-time detection of load conditions, ensuring high measurement reliability during transients while maintaining processing efficiency during normal operation. This dynamic approach balances reliability and productivity across different operating conditions.
Data Source
AI summary
A system may include a first controller and a second controller communicatively coupled to the first controller via a bidirectional communication channel and configured to drive a load in accordance with a target current signal, sample a load voltage of the load at a sample rate substantially slower than a time duration of electrical transients of the load, calculate a resistance of the load based on a current signal and the load voltage and communicate information indicative of the resistance to the first controller at a time interval substantially slower than the time duration of electrical transients of the load, detect when one or more accuracy-reducing events associated with the system occur, wherein an accuracy-reducing event is one which negatively affects accuracy of calculation of the resistance, and modify the information provided to the first controller when one or more accuracy-reducing events occur.