Device for filtering emissions and for immunity from current microcuts on a network supplied with current, positioned upstream of an apparatus to be protected, the device comprising at least the following elements: a bidirectional DC-to-DC conversion manager adapted for delivering a setpoint value to the terminals of an energy reserve capacitor; a device for extracting the current flowing in the network, configured to transmit the extracted current value to a regulating and monitoring device; a device for extracting a voltage value and transmitting it to a device for detecting microcuts which is connected to the regulating and monitoring device; means capable of preventing a voltage recovery back into the supply network, wherein the regulating and control device comprises at least a first feedback loop for the voltage of the apparatus, a second loop for filtering the current harmonics and a third feedback loop for the reserve voltage, the outputs of the three loops being connected individually to a control device, the function of which is to generate signals for a bidirectional management device for lowering or raising the value of the voltage at the terminals of the energy reserve so that this reserve delivers energy to the network or, on the contrary, extracts energy from the network by charging itself, characterized in that the device for extracting current is configured so as to transmit this extracted current to a bandpass filter adapted for removing the DC component from the extracted current and to frequency-limit the compensation, said bandpass filter comprising: a subtractor configured to receive the remaining AC component of the extracted current and a given reference current value I ref, and adapted for generating an error signal S e, a correction module adapted for processing the error signal S e and for generating a corresponding voltage value V cons, and for transmitting the error voltage value V cons to a summer adapted for weighting the error voltage value V cons, a reference voltage value and a charging voltage value for the energy reserve before transmitting them to the bidirectional DC-to-DC management device adapted for generating a voltage at the terminals of the energy reserve capacitor so that this reserve capacitor delivers energy to the network or, on the contrary, extracts energy from the network by charging itself. a bidirectional DC-to-DC conversion manager adapted for delivering a setpoint value to the terminals of an energy reserve capacitor; a device for extracting the current flowing in the network, configured to transmit the extracted current value to a regulating and monitoring device; a device for extracting a voltage value and transmitting it to a device for detecting microcuts which is connected to the regulating and monitoring device; means capable of preventing a voltage recovery back into the supply network, wherein the regulating and control device comprises at least a first feedback loop for the voltage of the apparatus, a second loop for filtering the current harmonics and a third feedback loop for the reserve voltage, the outputs of the three loops being connected individually to a control device, the function of which is to generate signals for a bidirectional management device for lowering or raising the value of the voltage at the terminals of the energy reserve so that this reserve delivers energy to the network or, on the contrary, extracts energy from the network by charging itself, characterized in that the device for extracting current is configured so as to transmit this extracted current to a bandpass filter adapted for removing the DC component from the extracted current and to frequency-limit the compensation, said bandpass filter comprising: a subtractor configured to receive the remaining AC component of the extracted current and a given reference current value I ref, and adapted for generating an error signal S e, a correction module adapted for processing the error signal S e and for generating a corresponding voltage value V cons, and for transmitting the error voltage value V cons to a summer adapted for weighting the error voltage value V cons, a reference voltage value and a charging voltage value for the energy reserve before transmitting them to the bidirectional DC-to-DC management device adapted for generating a voltage at the terminals of the energy reserve capacitor so that this reserve capacitor delivers energy to the network or, on the contrary, extracts energy from the network by charging itself. a subtractor configured to receive the remaining AC component of the extracted current and a given reference current value I ref, and adapted for generating an error signal S e, a correction module adapted for processing the error signal S e and for generating a corresponding voltage value V cons, and for transmitting the error voltage value V cons to a summer adapted for weighting the error voltage value V cons, a reference voltage value and a charging voltage value for the energy reserve before transmitting them to the bidirectional DC-to-DC management device adapted for generating a voltage at the terminals of the energy reserve capacitor so that this reserve capacitor delivers energy to the network or, on the contrary, extracts energy from the network by charging itself.