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Maximum Power Transfer

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Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
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Optrode Array for Simultaneous Optogenetic Modulation and Electrical Neural Recording

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Organic laser power converter for efficient wireless micro power transfer.

Yafei Wang^1,2, Zhong Zheng^3,4, Jianqiu Wang¹

¹State Key Laboratory of Polymer Physics and Chemistry, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.

Nature Communications

|September 7, 2023

Summary

Researchers developed efficient laser power converters using organic photovoltaic cells for wireless charging of micro-power electronics. This technology enables efficient power transfer for off-grid devices, overcoming low photon flux limitations.

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Area of Science:

Materials Science
Electrical Engineering
Renewable Energy

Background:

Wireless power transfer (WPT) offers a charging alternative for portable electronics.
Current laser power converters struggle with low photon flux, limiting micro-power applications.
Organic photovoltaic cells (OPVs) present a potential solution for efficient laser energy conversion.

Purpose of the Study:

To develop and evaluate laser power converters utilizing OPVs for WPT.
To establish a laser selection strategy and efficiency limit for these converters.
To demonstrate the feasibility of wireless micro-power transfer using OPV-based converters.

Main Methods:

Fabrication of laser power converters incorporating OPVs.
Development of a laser selection strategy and theoretical efficiency limit.
Experimental testing of converter efficiency and wireless power transfer capability.

Main Results:

Achieved 36.2% conversion efficiency at 660 nm with 9.5 mW/cm² photon flux.
Demonstrated wireless micro-power transfer with 0.5 W output over a 2-meter distance.
Validated the performance of OPVs in laser power converter applications.

Conclusions:

Organic photovoltaic cells show excellent performance in laser power converters.
This technology provides a viable solution for wireless power transfer of micro-power electronics.
The developed converters offer an efficient alternative for off-grid and portable electronic charging.