Design of High-Precision Driving Control System for Charge Management

Area of Science:

• Physics
• Electrical Engineering
• Sensor Technology

Background:

• Inertial sensor performance is degraded by accumulated charges on test masses interacting with electromagnetic fields.
• Effective charge management is essential for maintaining the accuracy and reliability of inertial sensors.
• Ultraviolet (UV) Light Emitting Diode (LED) discharge technology is the established optimal solution for test mass charge management.

Purpose of the Study:

• To present a novel driving control system for UV LEDs designed for precision charge management.
• To achieve controllable pulse-width-modulation (PWM)-type current output with adjustable pulse width and amplitude.
• To provide a reliable and accurate method for driving UV LEDs in sensitive applications.

Main Methods:

• Development of a driving control system utilizing analog PWM for pulse-width-controllable voltage signals.
• Implementation of range switching for precise amplitude regulation of the PWM signal.
• Employment of an improved Howland current source to convert voltage signals into PWM-type driving current.

Main Results:

• The system successfully achieved controllable current output ranging from 0.01 mA to 10 mA, with a minimum step of 0.01 mA.
• Demonstrated high accuracy of current output, reaching 1%.
• Exhibited excellent stability (better than 1% within 1 hour) and load regulation (better than 2%).

Conclusions:

• The developed UV LED driving control system offers a precise and reliable method for charge management in inertial sensors.
• The system's controllable current output and high accuracy provide a significant advancement in LED drive technology.
• This research serves as a valuable reference for integrating charge management systems and precision LED drive control methods.