SU1319198A1 - Mine-path converter - Google Patents

Abstract

The invention relates to electrical engineering and can be used primarily as a low-voltage power supply, with the requirement of providing an output voltage with a pulse rate. The purpose of the invention is to improve the quality of energy conversion. The device has reached a ninefold pulse frequency of the output voltage. In this case, six valves 2, 3,5,6,8 and 9 are connected in a ring, through which each phase of one winding connected in a star is connected to the other two phases of the other winding connected in a reverse star. Sections of the first star have taps connected to valves 1.4 and 7. The eighteen-fold frequency of the pulsation can also be achieved when two converters are connected in parallel, in one of which the first star is made straight, the second is inverse, and in the other star reverse, and the second - right my. 8 hp f-ly, 2 pcs. (O (L with about with 00,, W2o 5, Hn 6.16%, Fig. 1

Description

one

The invention relates to electrical engineering and can be used primarily as a low-voltage power supply when it is required to provide an output voltage with a high pulse rate.

The purpose of the invention is to improve the quality of energy conversion.

Fig. 1 shows a circuit diagram of a transformer transformer when connecting the first secondary winding to the forward one, and the second to the reverse three-beam stars; Figure 2 shows a vector diagram, explaining in the phase plane the formation of the current-forming EMF Sn (p 1.9) and the principle of operation of the device. I

In brackets with S (Fig. 2 shows the numbers of the current-carrying valves corresponding to them when they are naturally opened, and Fig. 1 shows some basic data that make it easy to compare the scheme's users with equivalent indicators of the analogs and the known converter. In this case, following designations: P - frequency ratio of output voltage ripple; H - number of separate parts (sections) of valve windings (secondary or secondary and primary); Wj-d - coil number, showing the ratio of the total number in tkov valve windings to the base with the number of turns on any voltage equal to the mean value Vf output voltage UQ mode XX;. Kf, - fluctuation coefficient showing a ratio of its full scope

dPP (from instant minimum

oh max) u value u value

under VP; K, Y, E LC is an improvement in performance relative to a known converter (in times), expressed respectively in the rotational direction K of the ripple frequency, a decrease in Y of its level and economy in the product of L, C values when the L-shaped LC filter is installed at the output of the converter the purpose of suppressing negative product mr. (.pulsations).

The device (Fig.P contains nine transforming elements, in particular, valves 1-9, and the valve windings a b, c and aj, bo, c connected therewith.

O

f5

982

In each of the geodes, the windings are connected, respectively, to direct and inverse three-beam stars, the common points of which form the output terminals with the load connected to them.

In this case, the first winding a, b., C. Is equipped with taps a, b, c, which through three valves 1.4 and 7 are connected with the common point of the second star a, bj., Ci, and others of the same name for this the star outputs are connected to the other star outputs of the other star through valves 2, 3, 5, 6, 8 and 9. Moreover, these valves are connected in pairs by similar electrodes and form a six-vent ring, which provides a consonant connection of the corresponding phase winding of one star with two opposite in phase windings of another star.

Due to such a connection, the output voltage U is variable on the load of the converter (Fig. 1), which is variable jup, and which pulsates at a frequency nine times the frequency of the converted EMF, which is shown by the ninth pulses R (ft V, 9) in fig. 2

30 In this case, the amplitude values of the pulses can be provided the same, and their successive phase shift relative to each other is equal to 40 electrical degrees, if the second

35 first a dh, s,) winding0

five

ki

and also tap a (b

2, c.j) run in each phase with the number of turns in the ratio sin sin VJ / 2.

40 The device operates as follows.

Each phase-shifted output voltage pulse has its own / and -th current path

45 loads, changing in time according to the composition of the elements during the period of the converted EMF of any of the winding sections. So, for example, the first contour of the Edeni totocopro, providing

0 the formation of a current-generating EMF S, (figure 2), contains the following elements (figure 1): tap aj - valve 1 - common point of the star - load - common point of the star.

55 In this case, in the ideal case, i.e. without taking into account the possibility of switching, the remaining eight valves do not conduct current, since the reverse voltage generated on them is closed

polarity (reverse voltage),

The remaining pulses 5 "are formed similarly (Fig. 1 and 2). As a result, a ninefold frequency of the output voltage ripple is provided (and its level K is equal to 6.16% in the XX mode, which is three and about three times better, respectively, than in the known device while simultaneously maintaining the total number W of valve turns windings.

Further significant improvement of indicators can be achieved if the converter is not made in a transformer one (figure 1), but in an autotransformer version or / and equip it with at least one more similar structure that can work on stand-alone or on the same load with series or parallel compound structures.

In particular, if in these two parallel or serially connected structures the first valve windings are connected to different types of stars, the structures of the same type as a whole provide an additional doubling of the frequency frequency of the pulsation, as well as a decrease in its level theoretically by an additional four times.

Claims (9)

Invention Formula . A nine-converter converter containing nine valves and a converter transformer t are three-phase secondary windings connected to direct and reverse three-beam stars whose common points form output pins, and the free terminals of the windings of the first star are connected according to six connected in a ring gates with windings of opposite phase the second star, to the common point of which three other valves are connected with the same direction of switching on all the valves relative to one of the output pins, different In order to improve the quality of the energy conversion, the windings of the straight star are provided in each phase with a tap that is connected to the free output of one of the three other gates, which This is a basic conversion structure. 2. The converter according to claim I., T is characterized by the fact that all valves included in the opposite direction. 3. The converter according to claims 1 and 2, characterized in that the first star is made straight or reverse, and the second - reverse or direct. 4. The converter according to claims 1 to 3, characterized in that, in order to increase the frequency ratio of the pulsation, the number of turns of the second and first stars and turns from the common point of the first star to the retraction are set in each phase in the ratio of 40 °: sin. 5. The converter according to Claim 4, characterized in that one of the secondary windings is filled out as the primary winding and is provided in ka: in this phase, a tap or additional coils forming the input terminals. 6. A converter according to claims 1-5, characterized in that, in a cut between the star's star point and the combined electrodes of these three gates, as well as in the dissection of the same electrodes of the six ring gates, inductive elements are included, corresponding of which the magnetically connected i-shi are not connected to each other. 7. The transducer according to claim 6, T is characterized in that inductive elements or / and transformers And / and the valves are controllable. 8. The converter according to claims 1-7, characterized in that it is supplemented with at least one more similar conversion structure, the outputs of which are autonomous with respect to the output terminals of the main structure or connected to them in parallel or sequentially. 9. The converter according to claim 8, O-1, and in order to further increase the frequency ratio of the pulsation, the first stars in one structure are made direct, and in the other - the reverse, with respectively reverse and direct second stars. P-3 5b (B) FIG. 2