研究目的
Investigating the development of a light-harvesting CMOS power-supply system for wireless microsensors that can efficiently draw power from a small PV cell and a battery to meet the energy demands of the sensor.
研究成果
The developed light-harvesting CMOS system efficiently draws power from a small PV cell and a battery to supply a 10-mW load, achieving high efficiency across a wide range of power levels. It outperforms existing systems in terms of power density and efficiency, making it suitable for wireless microsensors in various applications.
研究不足
The system's efficiency and power output are dependent on the size and quality of the PV cell and inductor. The use of off-chip components increases the system's volume, and the efficiency drops with smaller inductors due to higher resistance.
1：Experimental Design and Method Selection:
The study involves designing a CMOS system that integrates a PV cell, power transistors, and controller blocks to harvest light energy and manage power supply to a wireless microsensor. The system uses a switched-inductor converter for efficient power transfer.
2：Sample Selection and Data Sources:
The prototype uses a 1 × 1-mm2 PV cell and a battery to test the system's ability to supply power to a 10-mW load.
3：List of Experimental Equipment and Materials:
Includes a CMOS die integrating the PV cell, power transistors, and controller, off-chip inductors (18 μH and 22 μH), capacitors (100 nF and 10 μF), and a test board.
4：Experimental Procedures and Operational Workflow:
The system's performance is tested under various light intensities and load conditions to evaluate its efficiency and power conversion capabilities.
5：Data Analysis Methods:
The efficiency and power output of the system are measured and compared with existing light-harvesting microsystems.
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