Litofánový podsvětlovací rámeček se solárním napájením

Abstract

This thesis describes the design and physical implementation of a fully autonomous backlight frame for lithophane photographs. The goal was to create an energy-independent off-grid device with integrated solar power, eliminating the need for a grid connection. The development includes a theoretical energy balance for dimensioning the photovoltaic panel and Li-ion battery. The core is the design of complex electronics integrating solar and alternative USB-C charging, a boost DC-DC converter for an 80-LED panel, and dedicated analog sensor logic. Utilizing a PIR sensor and photoresistor, this logic is hardware-optimized for minimal quiescent current. The mechanical structure was designed in CAD software for optimal solar gains and light diffusion, and manufactured using 3D printing from PETG. The final part covers the commissioning of the PCBs, diagnostics, and performance measurements. The result is a fully functional and tested prototype.