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Overvoltage Protection Circuits for Ultrasonically Powered Implantable Microsystems.

Amin Rashidi, Kjeld Laursen, Seyedsina Hosseini

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference

|January 18, 2020

Summary

This study introduces a new overvoltage protection method for ultrasonic energy harvesting systems. The technique regulates current to limit voltage, saving power by deactivating when no ultrasonic waves are detected.

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Area of Science:

Electrical Engineering
Microsystems Engineering
Energy Harvesting

Background:

Ultrasonically powered microsystems require robust overvoltage protection to prevent damage.
Existing protection methods may introduce significant power overhead or complexity.
Piezoelectric harvesters exhibit specific voltage-current characteristics that can be leveraged for protection.

Purpose of the Study:

To develop a novel, low-power, and area-efficient overvoltage protection technique for microsystems powered by ultrasonic energy harvesting.
To integrate an ultrasonic burst detection mechanism for dynamic power management of the protection circuit.

Main Methods:

Design and simulation of a low-area, low-power overvoltage regulator using TSMC 0.18μm CMOS technology.
Leveraging the inherent voltage-current characteristics of piezoelectric harvesters for signal amplitude limitation.
Implementation of an ultrasonic burst detection block to control the regulator's power consumption.

Main Results:

The proposed overvoltage regulator occupies a silicon area of 285μm².
Quiescent power consumption is 37μW with ultrasonic waves and reduces to 3μW when inactive.
The negative feedback loop maintains a minimum phase margin of 68 degrees, ensuring stability.

Conclusions:

The developed technique effectively protects ultrasonically powered microsystems from overvoltage events.
The integrated burst detection significantly reduces power consumption, enhancing efficiency.
The proposed solution offers a practical and low-overhead approach for reliable microsystem operation.