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Integrated battery charger (IBC), which uses the already available propulsion system, has a lot of advantages such as low cost and minimum space for the high voltage battery charger. However, it needs to compensate some defects caused by it's structure. In this paper, shortcomings of the conventional IBC for PHEVs with interior permanent magnet motors are discussed, and two modified IBCs for better performance are proposed. Performance comparison among three IBCs is carried out; compared with the conventional IBC, two modified IBCs have many strengths like low common noise, simple sensing methods, high efficiency, and so on. Power loss calculation is conducted by the simulation software; then, experimental efficiency evaluation for three IBCs is provided.