Implementation design of the converter-based galvanic isolation for low voltage DC distribution

In this paper the implementation of the galvanic isolation in the low voltage direct current (LVDC) network is discussed. The galvanic isolation can be implemented either with a 50 Hz transformer located at the customer AC output of the customer-end inverter (CEI) or with an isolated DC-DC converter at the input DC network side of the CEI. However, the former solution results in a significant increase of the volume and mass of the system and has a high amount of no-load losses. Therefore, an isolated DC-DC converter is studied in this paper. Based on calorimetric measurements conducted for the passive 50 Hz transformer, the requirements for the DC-DC converter are set. Selection of the converter topology is carried out and the selected topology is studied by simulations and calculations. The results are compared with the 50 Hz transformer.