METOD FÖR LADDNING AV FORDON

Patentradars sammanfattning

Charge Amps AB discloses a method for a 3-phase electric vehicle supply equipment (EVSE) that staggers the closing of four switches—neutral, L1, L2, and L3—at seven distinct, carefully chosen points in time to limit the worst-case make short-circuit scenario. Between each switching event the EVSE monitors output port voltages to detect inter-phase electrical connections, and uses that detection to select the least energetic switching instant for the next phase. Each switch is closed near a zero-crossing of its phase or near a moment when two relevant phases share equal voltage, minimising instantaneous current stress. The approach allows EVSE components, particularly relays, to be specified for lower short-circuit ratings, reducing equipment size and cost.

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