Active thermal-fuse for stopping blue light leakage of white light-emitting diodes driven by constant current

Ching Cherng Sun, Quang Khoi Nguyen, Tsung Xian Lee, Shih Kang Lin, Chi Shou Wu, Tsung Hsun Yang, Yeh Wei Yu

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, we proposed and demonstrated a circuit design for solving problems related to blue light leakage (e.g., eye damage) when phosphor-converted white light-emitting diodes (pcW-LEDs) overheat. This circuit only needs a positive thermal coefficient thermistor, resistor, and diodes in series and parallel; thus, it can easily be integrated into components. Simulations and corresponding experimental results show that this method can accurately suppress the overheating component’s injection current and allow for LEDs to work normally after returning to the operating temperature. It thus allows the user's eyes to be actively protected, e.g., to avoid exposure to the bluish light when overheating occurs. In addition, the quenching of luminous flux is a signal to remind the user to replace the LED. The proposed method is low-cost, effective, simple, and useful for increasing the quality of LED lighting and biological safety.

Original languageEnglish
Article number12433
JournalScientific Reports
Volume12
Issue number1
DOIs
StatePublished - Dec 2022

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