Non-isolated power conversion apparatus based on virtual isolation

A non-isolated power conversion apparatus based on virtual isolation comprising:

• a filter unit provided with a common mode filtering function for reducing common mode electromagnetic interference (EMI) noise generated by high frequency components of an AC power system and a differential mode filtering function for reducing ripple components generated due to switching;
• a non-isolated AC-DC converter configured to convert an AC electrical signal output by the filter unit into a first level of DC electrical signal;
• a non-isolated DC-DC converter configured to convert the first level of DC electrical signal into a second level of DC electrical signal;
• a grounding unit connected between the non-isolated DC-DC converter and a DC load;
• a grounding electrical signal measurement device configured to measure a grounding electrical signal of a grounding wire connecting the grounding unit and a ground terminal or a common mode electrical signal of a system input terminal;
• and
• a grounding electrical signal controller configured to compare a grounding electrical signal measurement value received from the grounding electrical signal measurement device with a set grounding electrical signal command and control an output of the non-isolated AC-DC converter and the non-isolated DC-DC converter so that the grounding electrical signal is reduced.