The Three-in-One system integrates an on-board charger, DC/DC converter, and power distribution unit (PDU) into a single, lightweight solution for NEVs that require high integration and lighter power systems. Specifically designed for electric trucks, buses, and eVTOL aircraft, this system enhances energy efficiency, simplifies wiring, and optimizes space utilization. By eliminating the need for separate components, this system reduces weight, installation complexity, and improves overall reliability, making it ideal for OEMs looking for efficient and high-performance electrification solutions.