The vehicle-mounted high-voltage converter serves as a core component within automotive electrical systems, primarily converting high voltages (such as the 400V to 850VDC from new energy vehicle power battery packs) into alternating currents like 220V or 380V. This power supplies vehicle lighting, instrumentation, the Battery Management System (BMS), and onboard electronic devices including navigation systems, audio equipment, and air conditioning. Its operational principle relies on PWM (Pulse Width Modulation) and feedback control technology, delivering high efficiency (>92%), compact dimensions, lightweight construction, electromagnetic interference resistance, multiple protections (overvoltage/overcurrent/overheating/short circuit), and support for RS485 and CAN communication protocols. Application scenarios encompass powering electrical appliances in conventional fuel vehicles, energy distribution in new energy vehicles, driving appliances during outdoor camping, and emergency power supply. Its significance lies in ensuring stable equipment operation, extending service life, enhancing energy efficiency, and serving as the core component for energy management in new energy vehicles – an indispensable ‘power bridge’ within automotive electrical systems.