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, photovoltaic systems, motor drives, and power factor correction techniques. Some specific codes reference boost converters, buck-boost converters, isolated converters, high step-up converters, multi-level inverters, maximum power point tracking, and sinusoidal pulse width modulation. The codes are listed without descriptions under the header "CODE TOPICS FIELD". Contact information is provided at the bottom for DreamwebTechnosolutions.