Device for estimating output current of DCF (direct current filter) of fuel cell

The utility model discloses a device for estimating DCF output current of a fuel cell, and relates to the technical field of fuel cells. The technical key points are as follows: the output end of the EMC filter is connected with a second relay, the other end of the second relay is connected to the positive electrode of the BOOST, the output end of the BOOST is connected to the EMC filter, the other end of the EMC filter is provided with DCF output, a pre-charging relay is additionally arranged, the pre-charging relay is connected with the second relay in parallel, and the EMC filter is connected with the EMC filter. The pre-charging relay is connected with a pre-charging resistor in series, and the pre-charging resistor is connected with the second relay in parallel. The system has the advantages that the number of current detection transformers or Hall current sensors is reduced, and the overall cost and the overall size of the system are reduced; the precision and accuracy of estimated output current are hi