The battery chargers for electric vehicle (E.V.) are on-board devices in the case of normal charge. their power level is included in a range from 3 to 6 kW, corresponding to the 16 A or 32 A single-phase plug. After cost, size and weight are the most important criteria. In order to improve these three characteristics, integrated chargers have been developed. This solution re-uses the main converter of the drive train as an AC-DC converter, relying on the motor windings as inductors. No further component is required. This integrated charger has been studied and developped for a 6 kW power level from the single-phase 230 V / 32 A mains. Power factor correction, as well as d.c. current control over a wide range of voltage battery levels are obtained.
The study presented in this paper proposes the analysis of the three-phase converter for integration into EVs. In this case, available power up to 18 kW allows the charge time to be reduced. Two solutions are presented for the battery voltage matching. Onj one hand the control of the reactive power is analyzed in order to avoid an additional tansformer. On the other hand, the three-phase structure with transformer is presented along with experimental results. Owing to this structure, power level is higher than a conventional charger with a simplified system: the on-board part is integrated to the drive train and the fixed part is reduced to a simple transformer.
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