the time control 7 also issues a u201c 1 u201d as a result of the inversion the other and element receives a logical u201c 0 u201d in the case of a positive half wave thus in the case of a positive half wave it is impossible to obtain a u201c 1 u201d at the output of the and element connected to the sensor unit 8 even when the control signal 18 signals a logical u201c 1 u201d the relationships are reversed in the case of a negative half wave in other words the logic unit 19 consisting of the logic elements described above causes the time control 7 default value to be taken into account during the positive half wave while the sensor circuit 8 default value is taken into account during the negative half wave to ensure that the switched state of the mosfet 4 only affects one of the two loads 2 and 3 a rectifier is executed in an open bridge circuit the rectifier formed by the diodes d 11 to d 14 is switched in such a way that the negative half waves are admitted to a shared dc voltage output 21 the negative dc voltage output 21 is connected to ground the positive dc voltage output 22 and 23 is split in half that is the cathodes of diodes d 11 and d 12 are not connected to one.