The On-board Power Converter ecosystem comprises upstream, midstream, and downstream actors that enable conversion of vehicle electrical energy to usable volts for propulsion, auxiliary loads, and charging. Upstream participants supply silicon, magnetic, and passive components that form the converter core. Midstream actors design, qualify, and integrate these parts into modular units, embedding control firmware and thermal management. Downstream channels distribute finished converters to original equipment manufacturers (OEMs) and aftermarket integrators, where they are installed in electric‑drive, hybrid, and heavy‑duty vehicles. Value is captured through component margins, design services, integration fees, and volume sales to vehicle manufacturers.