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EV—Vehicle On-Board Charger

Oct 31,2022 | TCcharger

An On-Board Charger (OBC) is a system built into the vehicle to recharge the high-voltage battery from the AC mains while the vehicle is parked. The higher driving range of plug-in hybrid electric vehicles (PHEVs) and battery electric vehicles (BEVs) is achieved by increasing the battery capacity and the energy efficiency of electronic components. The battery voltage levels used tend to be standardized, around 450V, with a trend towards higher voltages as this supports shorter charging times and simplifies in-vehicle wiring. Discrete high-voltage components are widely used in OBC (on-board charger) applications and are replacing more and more module-based solutions due to price pressures. The trend for fast charging also affects the power envelope requirements of OBC topologies, so the new trend is 11 kW and even up to 22 kW designs. Such developments, coupled with the need for high efficiency and power density at low system cost, have strongly driven the use of three-phase solutions. Typically today, the flow of power from the grid to the battery is unidirectional, but there are also cases where it is used bidirectionally, such as battery to load or battery to grid.

(H)EV—Vehicle Battery Charger Diagram

System advantage
Suitable for plug-in hybrid and electric vehicles
Integrated Power Factor Correction (PFC)
Galvanic isolation
Wide input and output voltage range
Adjustable Current Limit
Automotive Standard Communication (CAN)
Modular solution for one to three-phase AC power supply