A Simulation Model for Thermal Management of Endoscopic LED-based Light Source

The advantages of endoscopic LED light sources over traditional endoscopic light sources, such as halogen and xenon light sources, have led to their current enormous use in the operating theaters in hospital surgical suites in and medical centers worldwide. The main challenge facing light sources is heat production. Here, we report the modeling of a 100-watt endoscopic LED light source with an operating voltage of 3.5 V and maximum current output 30 A using Simulink/Simscape. A buck converter has been used to convert 100-watt 12 V DC with maximum 8.3 A into 3.5 V DC with a maximum of 30 A. The operating voltage and current are controlled using PID controllers. The tuning of PID weights was made using auto tune feature. The simulation results showed that temperature can be controlled successfully to protect the entire system from high heat, and consequently avoid any damage to the LED source.