SU47004A1 - Ion frequency organizer - Google Patents

Description

For some technical purposes, it is sometimes necessary to have a current higher than the normal frequency. As an example, one can point to powerful induction furnaces without an iron core, high-speed AC motors, etc. In all these cases, an ion frequency multiplier can be used as a converter.

The proposed ion frequency multiplier allows the conversion of a three-phase symmetric frequency system (to a single-phase frequency 3).

In FIG. 1 shows a schematic diagram of the proposed ion frequency tripler, FIG. 2-corresponding diagrams of currents and voltages.

To perform the above frequency trip operation, we used a circuit with six ion rectifiers 2 (Fig. 1) which were connected to a three-phase winding of transformer 1 with zero output, so that three of them are direct valves and three are reverse.

The six valve system can be replaced by a four valve system,

(346)

FROM which one three-phase with a common cathode, and three single-phase. If such a system is made to operate in a voltage control mode, and to set the cut-off angle when controlling gas discharges equal to 120 ° and set using a phase regulator with peak transformers, then this is clear from FIG. 2, at the load terminals there will be a triple frequency alternating voltage, which can be used.

The factors that determine the profitability of this system will be the coefficient of efficiency of the installation, the coefficient of power of the primary winding of the transformer and the coefficients of the use of its windings. As for the first factor, due to the very small losses in the transformer and the valves, it can be easily realized at high voltages of 0.95-0.96. As is well known, in the first approximation, the power factor of a plant with a purely active load will be nothing more than the ratio of the power consumed by the load to the voltamperes taken from the network.

effective value of anode current rectifier (Fig. 2)

. /:

-G.

-

2-j

  ,

sin 2ot

a rc

. Tt

The effective value of the phase current of the secondary and primary windings of the transformer in case of its connection

/,.4 /, 2.

sin 2 a

Multiplied Frequency Power

(, sin 2aa

p - / s- - t p

d - z-Z- 2 t

 2 Tj

watt. Power taken from the network

u, 3 /, I, f, f 2 2tg

Power factor

- /

 .

sin2a and

1 +.

With

I /

0.866

 one/ . 1/0722 0.47. V6.28 3

The same value will be the coefficient of use of the windings.

transformer-k. The reverse of it. The size indicating the overall power of the transformer will be

  -213 K 0.57 of the above one can see that from the point of view of the primary power and output coefficient, the proposed system will be much more advantageous than the multi-phase saturated iron frequency multiplier used for the same purpose, which looks like f 0.9 and cos Ф 0, 35

In addition, this system is simpler in terms of start-up, which is extremely complicated in the frequency multiplication system with iron due to. strong saturation of the latter.

I as a disadvantage is the large size of the transformer.

The subject matter of the invention.

Claims (2)

1.Ionous frequency triple with three-phase current conversion into single-phase alternating current, characterized in that the tripling of the frequency used a circuit with six ion rectifiers connected to the three-phase winding of the transformer with zero output so that three of them are direct valves , and three inverse and working with a cut-off angle when controlling a gas discharge equal to 120 ° el. and installed using a phase controller with peak transformers. 2. Application c. a tripler according to claim 1, instead of three straight valves of one three-phase with a common cathode.