The power electronics in electric vehicles are moving towards very high efficiency and even higher power densities. In order to push the boundaries further, one research trend for on-board chargers is to remove the isolation transformer in order to save losses, size and cost. However, non-isolated chargers require sophisticated system design and control to limit leakage and touch currents to very stringent levels of only a few mA. In this paper, a novel modulation scheme eliminating the leakage current through the parasitic capacitances of the HV battery is proposed for three-phase neutral-point connected rectifiers/inverters. The effectiveness and performance of the proposal is validated by means of simulation and also by experimental results based on an industrial 20-kW grid-connected NPC inverter with digital control.
Zero-Leakage-Current Zero-Common-Mode Modulation for Neutral-Point Connected Three-Phase Non-Isolated On-Board Chargers
Petrella R.;
2024-01-01
Abstract
The power electronics in electric vehicles are moving towards very high efficiency and even higher power densities. In order to push the boundaries further, one research trend for on-board chargers is to remove the isolation transformer in order to save losses, size and cost. However, non-isolated chargers require sophisticated system design and control to limit leakage and touch currents to very stringent levels of only a few mA. In this paper, a novel modulation scheme eliminating the leakage current through the parasitic capacitances of the HV battery is proposed for three-phase neutral-point connected rectifiers/inverters. The effectiveness and performance of the proposal is validated by means of simulation and also by experimental results based on an industrial 20-kW grid-connected NPC inverter with digital control.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
