An electronic device for electrically connecting/disconnecting, based on a command signal (CMD), a first device terminal and a second device terminal connectable to an electrical generator and to an electrical load (L), respectively, the device comprising:
- at least one main electronic switch (M1), having a first electrical terminal (D1) connected to the first device terminal, a second electrical terminal (S1) connected to the second device terminal, and a main driving terminal (G1), the main electronic switch (M1) adapted to take, based on a driving signal (DRV), depending on the command signal (CMD) and on an enabling signal (ENB), a closed condition or an open condition, wherein the first electrical terminal (D1) is respectively connected or disconnected to the second electrical terminal (S1);
- a pre-charge electrical circuit, connected between said first and second device terminal, comprising at least one impedance element and at least one pre-charge electronic switch (M2), arranged in series, the pre-charge electrical circuit adapted to carry out, based on the command signal (CMD), a pre-charge operation, aimed at equalizing the electrical potentials (V1, V2) present at the first and at the second device terminal, before the main electronic switch (M1) takes a closed condition upon a transition from the open condition;
- a measurement, command and diagnosis module, adapted to detect a voltage difference (ΔV) between the first and the second device terminal, and further adapted to generate said enabling signal (ENB) based on the detected voltage difference (ΔV), and further adapted to generate, based on the detected voltage difference (ΔV) and on the command signal (CMD), a status signal (STS) indicative of a start phase, of an in-progress phase and of a completion phase of the pre-charge operation carried out by the pre-charge electrical circuit,
- wherein said main electronic switch (M1) and pre-charge electronic switch (M2) are power solid-state relays;
- wherein the measurement, command and diagnosis module comprises:
- a comparator module, adapted to detect the voltage difference (ΔV) between the first and the second device terminal, and further adapted to carry out a comparison of the detected voltage difference (ΔV) with a threshold voltage (VT), and further adapted to generate the enabling signal (ENB) based on said comparison;
- a command module, suitable to receive the command signal (CMD) and operatively connected to the comparator module to receive the enabling signal (ENB), the command module adapted to generate a control signal (CTR) based on the command signal (CMD), and further adapted to generate the driving signal (DRV), based on the command signal (CMD) and on the enabling signal (ENB), and further adapted to provide the driving signal (DRV) to the main electronic switch (M1) and to provide the control signal (CTR) to the pre-charge electronic switch (M2);
- a diagnosis module, operatively connected to the command module to receive the control signal (CTR) and to the comparator module to receive the enabling signal (ENB), the diagnosis module being adapted to generate a signal (ST) representative of the status signal (STS), based on said control signal (CTR) and enabling signal (ENB).