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If the load of the INCH (AD/DC converter in the car) is a single-phase, a 1-phase transformer with a voltage ratio of Np : Ns = 1.739 * can be used to reduce the phase-to-phase voltage from 400 V to 230 V, where one of the phases is earthed and connected to the N-terminal. This solution would be cheaper; however, we must ensure that the connection is always 1-phase.
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