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Proportional-Integral-Derivative (PID) controllers are widely used in various control systems to enhance stability and performance. In a thermostat, it adjusts heating or cooling based on the temperature difference between the actual and desired levels. They are often used in automotive speed systems, effectively managing sudden speed changes while maintaining a constant speed under varying conditions. On the other hand, PI controllers, commonly employed in voltage regulation, enhance stability...

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Photo-Electro-Thermal Model and Fuzzy Adaptive PID Control for UV LEDs in Charge Management.

Yuhua Wang^1,2, Tao Yu^1,3, Zhi Wang^1,4

¹Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China.

Sensors (Basel, Switzerland)

|July 14, 2023

Summary

This study presents a new model and control system for UV LEDs used in space mission charge management. The system enhances UV light output stability for high-precision inertial sensors.

Keywords:

UV LED charge management system fuzzy adaptive PID control inertial sensor photo-electro-thermal model

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Area of Science:

Spacecraft engineering
Optoelectronics
Control systems

Background:

Inertial sensors require charge management for space missions.
UV discharge is a non-contact method for charge management.
Accurate modeling of UV light sources is crucial for effective control.

Purpose of the Study:

To develop a low-power photo-electro-thermal model for AlGaN-based UV LEDs.
To design an optical power control system for improved UV light source performance.
To meet the charge management requirements of high-precision inertial sensors.

Main Methods:

A comprehensive low-power photo-electro-thermal model for UV LEDs.
An optical power control system using a fuzzy adaptive PID controller with a switch.
Integration of optical, electrical, and thermal characteristics in the model.

Main Results:

The proposed model achieved an average prediction error of 5.8 nW during steady-state operations.
The fuzzy adaptive PID controller reduced light output fluctuation to 0.67 nW during a single discharge task.
The system demonstrated effective steady-state and dynamic performance improvements.

Conclusions:

The developed model and control system effectively manage UV LED optical power.
The solution meets the stringent charge management needs of high-precision inertial sensors in space.
This work contributes to enhanced performance and reliability of space mission instrumentation.