DE662349C - Single-phase, adjustable alternating current resistor, consisting of a series transformer with a single grid-controlled discharge path on the secondary side - Google Patents

Description

Single-phase, adjustable alternating current resistor, consisting of a Series transformer with a single grid-controlled arranged on the secondary side Discharge Gap The invention relates to one dealt with in the '661,540 patent single-phase, adjustable alternating current resistor, which consists of a series transformer and a grid-controlled discharge path arranged on the secondary side, the secondary winding of the series transformer according to the selected control short-circuits immediately.

According to the main patent, the series transformer is dimensioned so that. it is highly saturated during the blocking time of the discharge path. It will be based on this Way achieved that despite the presence of only a single discharge path both Half-wave of the alternating current flowing through the primary winding of the series transformer can be exploited.

According to the present invention, this device is perfected by that the heating power for the hot cathode of the discharge path arranged on the secondary side is automatically reduced with increasing load current. This has the advantage that the resistance is uniform at every current strength in the useful circuit to be controlled works safely, as the emission of the hot cathode always corresponds to the required Anode current is adjusted. The load-dependent heating of the hot cathode is achieved by using a filament transformer whose primary winding is parallel to part or all of the primary winding in series with the consumer of the main transformer is switched.

In many cases it is also advantageous to use the iron core of the main transformer (Series transformer) to provide a special winding, which then, if necessary with the interposition of a heating transformer, which in turn supplies the heating power.

Embodiments of the invention are shown schematically in the drawing shown.

In Fig. I, i o means the alternating current source from which the alternating current consumerii should be fed. 1z is the series transformer; its primary winding 13 in the circuit of the consumer i i is switched on and its secondary winding 1 4 the discharge path 15 is located. The facility to generate a grid voltage, which indicates the onset of discharge within the positive Allowing half-wave to be shifted at will is in the drawing for simplicity omitted for the sake of

The regulation of the current intensity in the alternating current consumer i i comes, as described in the main patent, in such a way that by means of the grid control the discharge path 15 is the mean value of the current in the secondary circuit and thus is also regulated in the primary circuit of the transformer 12. During the positive Half-wave (permeability section) of the discharge path then leaves more or more less short-circuited series transformer pass a current of a certain strength. During the blocking time, however, the transformer, which is actually idling, throttles the current is also not noticeable because of the high magnetic saturation. The balancing operations in the transformer rather cause an oppositely flowing current, the with respect to the current flowing during the permeability section its current mean value is only slightly, lower.

The heating transformer 16 for the discharge path is connected to the primary winding 13 of the main transformer connected in parallel. Because the voltage on the primary winding the smaller, the greater the mean value of the load current of the discharge path 15, this circuit heats the discharge path with a power which decreases with increasing load current, d. H. which is the smaller, the larger is the Mätuel; -wert of the current flowing through the relief section 15. , Instead of the filament transformer can also be connected to part of the primary winding 13 Primary winding to be connected.

In the embodiment shown in Fig for the discharge path 15 from a special winding 17 on the main transformer i 2 attached is supplied. The filament transformer i8 can be used in this facility can also be omitted if the winding 17 has such a number of turns can be carried out so that it provides the heating voltage required for the discharge path 15 supplies. In addition, the mode of operation of this device agrees with the one on hand the same as described in Fig. i.

Claims (3)

PATENT rnNsPRü cirr i. Single-phase, controllable alternating current resistor, consisting of a series transformer with a single grid-controlled discharge path arranged on the secondary side according to patent 661 54o, characterized in that the discharge path (15) is heated with a power which decreases with increasing load of the discharge path. 2. Device according to claim i, characterized in that that a filament transformer (16) is provided, the primary winding of which is parallel to part or all of the primary winding in series with the consumer (13) of the main transformer (12) is located. 3. Device according to claim i, characterized characterized in that on the iron core of the main transformer (12) a special Winding (17) is arranged, of which; possibly with interposition a heating transformer (18), the heating power is supplied.