GaN Light Emission for Control System Feedback
Abstract
This work explores previous research showing the correlation of light emission to current and temperature in a gallium nitride (GaN) vertical diode to predict current within a power converter circuit. Use of light emissions to measure current would offer an improvement over present sensors, since light would not be affected by the EMI found in most switched power converters. Matrices of the light emissions at 370, 380, 390, 400, 440, and 550 nm wavelengths over a range of 0.2 A to 4 A and 20 C to 110 C were used to develop best-fit polynomials for each matrix. Two of these polynomials can then be utilized to derive a unique solution of current and temperature based on the light output at the distinct wavelengths. Lock-in amplifiers allowed the amplification of weak light signals without gain bandwidth product limitations. Future efforts will be to duplicate the lock-in amplifier as well as the current and temperature prediction with use of a microcontroller.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 2020
- Accession Number
- AD1181391
Entities
People
- Johnathan L. Williams
Organizations
- Naval Postgraduate School