Common mode filter device adapted for being connected between an electrical AC network and an electrical apparatus , said common mode filter device comprising: - a first electrical connection dedicated for connecting an earth terminal of the AC network to a common terminal of the apparatus ; - at least two second electrical connections (41-43) each for connecting a respective phase terminal (11-13) of the AC network to a respective power terminal (31-33) of the apparatus ; and - separately for each second electrical connection (41-43): two filters arranged serially, each filter comprising a separate common mode inductor arranged in said second electrical connection; and - two transformers and a current control circuit , a secondary winding of a first one of the transformers being arranged for producing a detection voltage representative of a common mode current existing in the second electrical connections (41-43), the current control circuit being arranged for sensing the detection voltage and for generating a control current in a primary winding of the second one of the transformers, the common mode inductor of the filter closest to the apparatus for each second electrical connection (41-43) being a respective secondary winding of the second transformer , so as to generate a compensation current in said common mode inductor of the filter closest to the apparatus of each second electrical connection, the current control circuit and both transformers being adapted so that the compensation currents compensate at least partially for the common mode current which is transmitted into the second electrical connections (41-43) by the apparatus from the power terminals (31-33), the common mode filter device being characterized in that each filter is a LC-filter so that two LC-filters are arranged serially for each second electrical connection (41-43), each LC-filter comprising a separate capacitor (211-221) connected between said second electrical connection and the first electrical connection , and the common mode inductor of each LC-filter being arranged in said second electrical connection upstream of the capacitor of the same LC-filter, relative to a direction (D) from the AC network to the apparatus , and in that the current control circuit comprises a compensator and a current buffer , the compensator being adapted for feeding the current buffer with an intermediate signal, said intermediate signal varying as a function of the detection voltage, and the current buffer is adapted for acting as a current generator which outputs the control current as a function of the intermediate signal. - a first electrical connection dedicated for connecting an earth terminal of the AC network to a common terminal of the apparatus ; - at least two second electrical connections (41-43) each for connecting a respective phase terminal (11-13) of the AC network to a respective power terminal (31-33) of the apparatus ; and - separately for each second electrical connection (41-43): two filters arranged serially, each filter comprising a separate common mode inductor arranged in said second electrical connection; and - two transformers and a current control circuit , <EOS>