Self-Powered Intelligent Cooling System for High-Power Light-Emitting Diodes Based on Temperature Feedback Mechanism

In this article, an intelligent cooling system for a high-power light-emitting diode (LED) based on a temperature feedback mechanism is presented. The proposed system applies a photovoltaic panel and thermal sensing power supply to operate cooperatively to realize self-sufficiency for electrical energy harvesting. Taking the thermistor as a bridge, a thermoelectric feedback analog circuit linking the junction temperature of the LED and cooling intensity of the thermoelectric cooler (TEC) is established. Moreover, a TEC cooler is integrated with an LED via an intelligent cooling strategy to enable automatic tracking of the heat dissipation of the LED in real time to quickly cool it on demand. Furthermore, the entire system relies on self-starting switching technology for charging and discharging modes of two batteries for stable power management. The experimental results show that an improvement of 22.9% in the cooling efficiency is achieved with the proposed temperature feedback technique. The system starts within 15 s, which can accomplish rapid cooling and stable regulation for LEDs in 100 s. This work demonstrates a feasible scheme for automatic and real-time cooling of power electronic systems.