This document contains 50 code topics related to various aspects of power electronics and electrical engineering. The codes cover a wide range of topics including DC-DC converters, inverters, solar power systems, motor drives, and control techniques. Some specific codes reference boost converters, buck-boost converters, isolated converters, high step-up converters, multi-level inverters, maximum power point tracking, and power factor correction. The document also lists contact information for DreamwebTechnosolutions.