Development of Pulse/DC Characterization System for LEDs

Development of LEDs for various applications, such a vehicle lighting, signage, and commercial and residential solid state lighting is progressing at a rapid pace. Various methods exist for measuring the performance of LEDs, but variations in test configurations, thermal management, T&M equipment, and operator experience lead to significant variation in measured performance. The project will design a commercially viable instrument for precisely controlling LED junction temperatures for consistent and repeatable performance during LED test processes. The method, as defined by the Zong/Ohno, eliminates the variations and repeatability errors in thermal interfaces and ensures the junction temperature, a key metric in LED testing, is both known and controllable. Both DC and AC testing modes will be supported.