Electronic switch network part for supplying current to an accumulator with a blocking oscillator type converter

Electronic switch network part for supplying current to an accumulator (61) from an alternating or direct current input source with a primary beat blocking converter which contains a transmitter (5) whose secondary winding (52) is connected in series with the accumulator (61) and a first diode (31) and whose primary winding (51) is connected in series with a collector-emitter path of a first transistor (1) whose base is attached to one end (P1) of the secondary winding (52) of the transmitter (5) by a regenerative resistance (27) and a regenerative capacitor (11) wherein the other end (P4) of the secondary winding is connected to the accumulator (61), and the first transistor base also is connected by a first resistance (21) to one pole of the input source and to a collector of a second transistor (2) whose emitter is placed on a reference potential wherein an emitter of the first transistor (1) is connected with the reference potential by a second resistance (22) and the accumulator (61) and also attached to a base of the second transistor (2) by a zener diode (41) wherein a rocker stage is provided which blocks the first transistor (1) on reaching a predetermined upper switch-off voltage (U.sub.a) at the accumulator (61) and releases same when understepping a predetermined lower switch-on voltage (U.sub.e), characterized in that the rocker stage consists of a third transistor (3) and a fourth transistor (4), that an emitter of the third transistor (3) is attached (P5) to a first voltage divider (20, 50) mounted between the one end (P1) of the secondary winding (52) and the accumulator (61), that a base of the third transistor (3) is attached (P6) to a second voltage divider (25, 23) mounted between the accumulator (61) and a collector (P7) of the fourth transistor (4), that an emitter of the fourth transistor (4) is connected with the reference potential and the collector (P7) of the fourth transistor (4) is connected by a second diode (32) with the one end (P1) of the secondary winding (52) and that a collector of the third transistor (3) is coupled both with the base of the second transistor (2) and with a base of the fourth transistor (4).