An electronic ignition system for an internal combustion engine comprises an ignition coil (2) provided with at least a primary winding (3) and a secondary winding (4), a switch (6) connected to the primary winding (3) and drivable in an open and/or closed position according to the value of a driving signal, a control unit (7) associated to the switch (6) and configured to drive it in open and/orclosed position according to the value of the driving signal (G). Such system also comprises current detection means (10) associated with the secondary winding (4), in which the control unit (7) is associated with the detection means (10) for receiving a signal representative of at least a current value (In) in the secondary winding (4), and configured to control the switch (6) according to said signal.