AN ELECTRICAL SWITCHING CIRCUIT, CORRESPONDING METHOD AND APPARATUS

An electrical switching circuit, includes a first (X1) and a second (X2) terminal; an electromagnetic switch (200) having a positive (V+) and a negative (V-) power supply terminal and an output terminal (O), the negative (V-) power supply terminal being connected to the second (X2) terminal; an electronic switch (T1) connected between the first (X1) and the second (X2) terminal and having a control terminal connected to the output (O) of the electromagnetic switch (200), that switches between an opened and a closed condition as a function of a signal applied to the control terminal, thereby varying the resistance between the first (X1) and the second (X2) terminal; electrical storage means (C1), connected between the positive (V+) and negative (V-) power supply terminal of the electromagnetic switch (200); and a diode (D1), with the cathode connected to the positive power supply terminal (V+) of the electromagnetic switch (200) and the anode connected to the first (X1) terminal, whereby: when the voltage (V OUT ) between the first (X1) and the second (X2) terminal is greater or smaller than the voltage between the positive (V+) and the negative (V-) power supply terminal of the electromagnetic switch (200), the diode (D1) is closed or opened and the electromagnetic switch (200) is either supplied by the voltage (V OUT ) between the first (X1) and the second (X2) terminal or by the electrical storage means (C1), the electrical storage means (C1) charging when the voltage (V OUT ) between the first (X1) and the second (X2) terminal is greater than the voltage between the positive (V+) and the negative (V-) power supply terminal of the electromagnetic switch (200).