SU425293A1 - DEVICE FOR POWER SUPPLY OF PULSE CONSUMERS - Google Patents

Description

one

A device for imitating pulsed consumers is known, which contains a multiphase electromachine generator and capacitor accumulators connected in a star circuit and connected via valves to the phase windings of the generator.

In order to reduce overall dimensions, the proposed device is equipped with an additional block of capacitor storages, allowing us to provide them with self-excitation of the generator, connected but the star circuit and connected through polarity valves opposite to the said windings of the generator windings.

FIG. 1 shows the scheme of the proposed device; in fig. 2 a-d - timing diagrams of voltages and currents of the generator and storage device.

An asynchronous or synchronous multiphase electromachine generator, for example, a three-phase generator, is excited by two blocks of capacitor batteries, which are simultaneously capacitive drives.

The capacitor batteries 1-3 of the first block are connected by a star and connected via valves 4-6 to the phase windings of the generator, also connected by a star. The nodal points of the generator and accumulators are connected by a zero wire.

Storage capacity 1-3 drives are manufactured from

generator through valves 4-6. The discharge of these

drives for impulse consumers 7-9

carried out with the help of commuting

items 10-12.

The second star of accumulators 13-15 is connected to the phase windings of the generator through additional valves 16-18. Polnity

The valves of the first and second stars of the drives are opposite to each other. The valves in all three phases of each star of the accumulators are included in the same way: from the beginning of the phase to its end in one star and from the end to the beginning of the second one.

Another group of pulse consumers 19-21 is connected to accumulators 13-15.

The discharge of the drives to these consumers is carried out via switched elements 22-24.

A distinctive feature of the device is the presence of the second star of accumulators 13–15 with charging valves 16–18 and the second group of pulse consumers 19–21 with switched elements 22–24.

The operation of the generator drive system is explained using the timing diagrams shown in FIG. 2 a-d, on the example of processes in a phase in each star of accumulators.

The drive 1 is charged at a positive voltage half-wave in phase A of the generator i7a (about g - Y

The charge current resembles a half-wave of a sine wave. When the voltage (7a lowers, the valve 4 connected in series with the accumulator 1 does not pass the reverse current and does not allow the accumulator to discharge. Therefore, the voltage of the accumulator Ui remains constant (t / i const) (see Fig. 26) The charging current (tl) is absent.

The drive can be discharged at t -,

when the polarity of the voltage t / a on the generator changes, i.e., approximately one quarter of the period after the end of charging of the storage ring. The voltage phase La, at which the drive discharge is made, ranges from 180 to 360 °. The moment of discharge can be

t any in the range from - to T.

With a negative voltage half-wave (VA valve 4 does not allow the drive I to charge after its discharge. Thus, regardless of the phase of the voltage La at the time of the discharge, ranging from 180 to 360 °, the charge of the drive starts from the beginning of the next half-period of voltage La, i.e. at / T.

Further process will be repeated. Thus, drive 1 does not load the generator with negative polarity of voltage La, i.e.

at - f T.

i

In the other two phases of this star of storage, the processes are identical to that described, but they pass with a phase shift of 120 and 240 °.

The accumulator 13 of the second star of accumulators starts charging from the same phase L of the generator at / - (see Fig. 2 B). Process

charging also lasts a quarter period at

t3

- / - t. The discharge of this storage drive is 35

It is removed from the - t i - t. Characters

44

The processes in drives 1 and 13 are identical.

each other. However, they are shifted by half the period, so the directions of the drives 13 (Az) and I (tl) are opposite; the polarities of the stresses Ll and Lla 5 of these two drives are opposite.

In the other two phases of the second star of accumulators, the processes are identical to the processes in accumulator 13, but they pass with a phase shift of 120 and 240 °.

0 Thus, the current phase L of the generator is a set of pulses with a length of a quarter of a period, and the directions of the currents of adjacent pulses are opposite. FIG. 2 shows the shape of the current in phase L on the accumulator 5.

The use of the second star of capacitive drives leads to the appearance of positive qualities in the system. For each period of the voltage of one phase, two accumulators are charged: one with a positive voltage half-wave, the other with a negative one. As a result, the useful power of the generator doubles with the same dimensions of the generator. For a given total net power, this is equivalent to reducing the weight and size of the generator.

If the power source is an asynchronous self-excited generator or a synchronous jet generator, then using such generators, a circuit with one star of accumulators with series-connected gates is inoperative. The use of the second star of the accumulators makes the circuit workable, since it ensures the self-excitation of such a generator.

Subject invention

A device for powering impulse consumers, containing a multiphase electric machine generator and capacitor drives connected by a star circuit and connected via valves to the phase windings of the generator, characterized in that, with the aim of reducing its size, it is equipped with an additional block of capacitor drives that allow self-excitation of the generator, connected according to the "star" scheme and connected through the valves opposite to the said valves of the polarity to the phase windings; generator . Tf, 5,

.