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

Abstract

Inertial sensors can serve as inertial references for space missions and require charge management systems to maintain their on-orbit performance. To achieve non-contact charge management through UV discharge, effective control strategies are necessary to improve the optical power output performances of UV light sources while accurately modeling their operating characteristics. This paper proposes a low-power photo-electro-thermal model for widely used AlGaN-based UV LEDs, which comprehensively considers the interaction of optical, electrical, and thermal characteristics of UV LEDs during low-power operations. Based on this model, an optical power control system utilizing a fuzzy adaptive PID controller is constructed, in which a switch is introduced to coordinate the working state of the controller. Thus, the steady-state performance is effectively improved while ensuring dynamic performance. The results show that the proposed model has an average prediction error of 5.8 nW during steady-state operations, and the fuzzy adaptive PID controller with a switch can reduce the fluctuation of light output to 0.67 nW during a single discharge task, meeting the charge management requirements of high-precision inertial sensors.

High-Precision Inertial Sensor Charge Management Based on Ultraviolet Discharge: A Comprehensive Review

“…Moreover, a deep understanding of the operating conditions and usage methods is necessary [ 120 ]. Presently, various studies have examined the feasibility of UV LED space applications [ 117 , 121 , 122 ] and UV LED control technology [ 100 , 123 ]. These results have provided a good foundation for the future practical implementation of CMSs based on UV LEDs.…”

Design of High-Precision Driving Control System for Charge Management

“…Therefore, it is necessary to perform "charge management" on the surface of the TM, specifically implementing control over its charging and discharging, to mitigate the impact of charges on scientific detection tasks [6]. The method based on the photoelectric effect principle, utilizing ultraviolet light sources to irradiate the TM and its external electrode housing, is considered an effective solution [7][8][9]. The implementation of this method involves no mechanical connections between the charge management system (CMS) and the TM, ensuring that charge management is achieved without introducing additional displacement noise interference [10,11].…”