SU97349A2 - AC to DC or DC to AC converter - Google Patents

Description

BASIC Auth. St. N4 96948 describes the conversion of alternating current to constant or constant to alternating, consisting of four three-phase groups of equalized electric valves, but included in a push-pull circuit, working with leading or lagging angle phase shift and composed of two three-phase bridges, included parallel and fed from the six phase secondary windings of the anode transformer, and the above mentioned secondary windings are electrically connected in pairs. The common points of the three pairs of these windings are connected through capacitors, and the bridges are connected to the DC circuit at both poles through equalizing chokes, having leads from the middle points.

The converters described below, whose cxeNibi are given in FIG. 1, 2, 3, 4, they are modifications of the converter made according to the copyright certificate of authorship.

On the fit. Figure 1 shows a converter circuit in which, for the purpose of using one anode transformer with one secondary three-phase winding, does not have one, it does not have leads from the middle points of the phases, the capacitors are connected between the beginning and the ends of the different phases of the secondary winding. Here: / -anodium transformer, in which between the beginnings and ends of the different phases of the secondary winding, capacitors 2 are connected; 3-leveling chokes; 4, 5, 6 and 7-four three-phase groups of controlled electric valves,

FIG. 2 shows a circuit (in a single-lined image of a Yenin) converter having two double-wound anode transformers /, in which capacitors 2 are connected to the ends of the primary

No. 97349-2 -

windings of anode transformers J, interconnected by means of an additional double-winding transformer 8, providing counter-current flows through the capacitors from the individual converters. The remaining designations in the diagram of FIG. 2 are the same as in FIG. one.

FIG. 3 is a diagram of a converter made with the successive connection of two three-phase bridges, each of which is formed of two three-phase i-runn (4, 5, 6 and 7) controlled valves and is connected to a separate two-winding anode transformer 1. In this converter there are secondary anode windings The transformers are interconnected ne directly, and through an additional two-winding transformer 8, and the capacitors 2 are connected to both windings of the last-minute one.

On fpg. 4 shows a converter circuit in which the auxiliary transformer 8 interconnects not secondary, and the primary windings of the anode transformers 1Prn of the same control angles of all the valves (Fig. 3 and 4) do not pass through the coNlTensors 2 and the converters operate in the usual way with commutation naturally. If the control angle for valves a, b, c and d, d, f is equal to tj, and at valves a, b, c and d, d, f it is 2. This generator works with a leading angle shift. The pulse width of the current passing through the capacitors is 1; - :: a, a, and the main frequency of the current of the capacitor is equal to the network frequency. The amplitude of the pulse is, where 1 is the load.

The efficiency of p1) of the generator is increased if the adjustment angle a, b is established for valves a, b, c and a, b, c, and the angle is adjusted for valves g, d, w and d d, g.

In the latter case, the width of the current pulse passing through the capacitor will still be equal to a., -Aj, the amplitude of the pulse equal to / 3 1, the fundamental frequency of this current doubles.

In transform.ch x, whose schemes are not shown in FIG. 1 and 2, there is also the possibility of a regular leading shear angle, independent of the load current.

In order to increase the voltage of the capacitors to the voltage of the load current, it was necessary to reduce the time for the flow of current through the capacitors during the HOMOHIH grid control.

Prevention and Consideration

1. Change of irreducible current converter into nostoyanny or constant to non-temporal but ant. St. L 96948, distinguished by the fact that, with the use of one anode trapeformat in the circuit, and with one secondary three-phase winding, not having conclusions from the midpoints of the phases, the de-coupling 1 is connected between the beginning and the ends of the different phases of the secondary winding of the anode transformer.

2. Change the converter avg. L 96948, which has two double-winding anode transformers, characterized in that the capacitors are connected to the ends of the nervous windings of the anode transformers, connecting each other with a single-sided double-winding transformer.

3. Change in power converter but auth. St. No. 96948, made with the sequential connection of two three-phase bridges, each of which is formed from two three-phase groups of electric controlled valves and is connected to a separate two-winding