研究目的
To present a novel measurement system (PiEMS) that outperforms existing approaches in terms of accuracy, temporal and measurement resolution, and additional possibilities to automate the characterization measurements for wireless sensor nodes (WSN) powered by energy harvesters.
研究成果
The PiEMS system outperforms existing approaches in terms of accuracy, temporal and measurement resolution, and offers additional possibilities to automate characterization measurements. Future work will focus on further optimizations and extensions of the system architecture.
研究不足
The system currently cannot measure currents below 1.7V, and there is measurement noise in the range below 1μA. Future work will focus on reducing these measurement errors and extending the system architecture for lower voltage measurements.
1：Experimental Design and Method Selection:
The PiEMS architecture is based on a high-side current measurement, divided into several analogue and digital circuit parts. It uses 3 shunt resistors in series for a measurement range from 10nA to 250mA, with each range optimized for specific current measurements. The voltage drop over the shunt resistor is amplified, and unused shunt resistors are bridged with a P-channel MOSFET to eliminate their voltage drop.
2：Sample Selection and Data Sources:
Precision resistors are used as static load over the whole range for validation. The WOR pulse of the CC1101 is used as a reference signal for temporal resolution evaluation.
3：List of Experimental Equipment and Materials:
Raspberry Pi 3, MAX99022 amplifier, AD7175 ADC, P-channel MOSFETs, precision resistors, and an adjustable voltage source for calibration.
4：Experimental Procedures and Operational Workflow:
The system performs self-calibration before measurements to improve accuracy. It measures current and voltage, calculates power, and integrates over time for energy.
5：Data Analysis Methods:
The measured data is processed and stored on the Raspberry Pi, with digital filters available for post-processing of raw data.
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