SU1758813A1 - Constant voltage/three-phase quasi-sinusoidal voltage converter - Google Patents

Abstract

Use: Conversion of direct voltage to alternating three-phase quasi-sinusoidal voltage for use in three-phase inverters of the secondary power supply and electric drive systems. The essence of the invention: when switching the keys 1-4 of the main inverter on the windings of the main transformer 13, a rectangular triple frequency voltage is formed. On the windings of the first and second auxiliary transformers 14 and 15, respectively, when switching switches 5-12, rectangular voltages of increased frequency are formed with zero pauses at certain time intervals. By means of alternating current switches 26-31, switched according to a certain algorithm, the indicated voltages are summed and fed to the output terminals of converter A, B, C, to which the secondary windings 16-21 of the main transformer 13 are connected in an open triangle pattern. As a result, each phase voltage at the output of the generator has a 16-step shape close to a sinusoid. 4 il. ate with

Description

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C188SII

Claims (1)

Claim The DC-DC converter to a three-phase quasi-sinusoidal voltage containing the main, first and second auxiliary inverters, outputs connected to the primary windings of the main, first and second auxiliary transformers, the secondary winding of the main transformer has a tap from the midpoint, dividing it into two halves with the first intermediate tap in each of them and connected to the first output terminal of the converter, the first and second extreme terminals of the said winding through the alternating current keys are connected respectively to the second and third output terminal of the converter, the first and second auxiliary transformers have two secondary windings connected in two independent branches, in each of which one secondary winding of the first and second auxiliary transformer is connected in series, characterized in that . in order to improve the quality of the output voltage by reducing the harmonic coefficient, the first output of the first and second branches is connected respectively to the second and third output terminals of the converter, and the second output of the first and second branches is connected through one alternating current key 1757513 ka to the first intermediate tap, respectively, of the second and first half secondary winding of the main transformer, and through another alternating current switch with a second intermediate tap of this half of the secondary winding introduced, the number of turns of the section between the terminal terminal and the first intermediate branch, between the first and second intermediate branches, between the second intermediate branch and the branch from the midpoint of each half of the secondary winding of the main transformer and the number of turns of each secondary winding of the first and second auxiliary transformer are as 5: 2: 5: 3: 1. FIG. 2 - ij ^t li ' ⁿ J' ^l uiPJ ¹ -J ⁱⁿ iPtPJ ^iri J1_J ^r Li ^nr lj ⁿ tz? L -------- I. - - _____I__I 'I / J L --------- 1 -------------- 1 L L t II II s ·: - ! L I // ,-----------1-  1 ------ 'I jy j - lZ - Zi_ ...... .... .17 'Π 1 ...... I ^r - if J I --.------- L_ 1 1 FIG. 3 / Ing. k'oz o.9d ec <9. 3 / x ~ op9 (x 75 & δοΡύ / 35 56 57 DG 39 77 92 7S 99 95 93 At 9 0 I O ABOUT ΰ 0 9 At At At 9 7 9 7 ABOUT 7 ABOUT ABOUT 2. Λ FROM* ΰ ΰ 9 1 ΰ at At At 9 7 about 7 about 7 about about s 0 about 0 0 about about at At At 7 ABOUT about 7 about 7 about ABOUT Ϋ ΰ 0 ABOUT ΰ ABOUT ABOUT at / about ABOUT 7 about 7 about 7 about 7) 5 ο ι about ABOUT Τ ' about about ABOUT At At about ABOUT ABOUT ΰ 7 about 7 about ABOUT 6 ο ABOUT ABOUT At about 9 about / At about 9 ABOUT about 7 about 7 about ABOUT 7 0 about about / 9 ABOUT about about At about 7 ABOUT 7 ABOUT about ABOUT 7 about 2 (2 about about At 9 7 about ABOUT At about 7 7 1 ABOUT about ABOUT 7 ΰ 9 ΰ ABOUT 9 ABOUT about about about At ABOUT ABOUT 7 7 ABOUT about ABOUT 7 about / 27 0 ABOUT 9 about ABOUT 7 about about LT about 9 ABOUT 7 ABOUT ABOUT ABOUT 7 ABOUT / Y 0 ABOUT 1 ABOUT 1 0 ABOUT D ABOUT ABOUT ABOUT ABOUT 7 ABOUT about ABOUT 7 D / 2 0 ABOUT 1 ABOUT 1 1 0 ABOUT ΰ ABOUT 1 7 about about ABOUT 7 ABOUT 75 0 ABOUT 1 1 0 \ o 0 D ABOUT 7 7 7 ABOUT 0 7> ABOUT 7 9 f *. G at “1 1 0 1 0 about about ΰ e 1 7 ABOUT about about about 7 7 s 0 ABOUT At 9 / 9 ABOUT about about 9 about about 7 ΰ about ABOUT D 7 'X ΰ 0 At 9 at 9 T ABOUT ABOUT 7 ABOUT about 7 ABOUT D ABOUT about 7 / 7 0 1 ABOUT ABOUT D ABOUT about 9 ABOUT 7 7 ABOUT about about 7 ~ ΊΓ 0 at 0 ~ 0 ~ 9 ABOUT 7 / ABOUT 2 ABOUT about At about d about 7 19 0 at ABOUT ABOUT At ABOUT A 1 At ABOUT 4 7 about at about about about 7 20 0 at ABOUT ABOUT / t 1 At ABOUT ABOUT about ABOUT At about about about 7 21 0 at 0 U about _ to 7 / 7 At d- about 7 about about about 7 22 at 0 1 0 1 t 9 At 7 0 about 72 7 ABOUT about about 7 25 at ABOUT 1 At 0 \ O 9 at 9 9 \ABOUT about ABOUT 7 about 7 ABOUT 29th 0 At (2 7 At 7 ABOUT 7 at 7 7 1 about ABOUT 7 ABOUT 7 ABOUT 25 ~ 7Γ 9 ABOUT about ABOUT ABOUT / At 7 ABOUT 7 about ABOUT 7 about 7 ABOUT 26 ο at 9 about about 9 about At 9 7 \ 0 about ABOUT 7 about 7 ABOUT 29th 0 At 7 about ABOUT ABOUT at about 9 ABOUT about about (9 7 about 7 <o 25 0 At At 0 ^ -U At \ABOUT At about At ABOUT 7 ABOUT ABOUT 7 about 7 ABOUT 29th 0 ~ r ~ t ABOUT ABOUT \about about 7 0 7 ABOUT about ABOUT 7 7 ABOUT ABOUT thirty 0 7 about 7 ABOUT (2 9 ABOUT 9 ' 7 ABOUT 1 7 ABOUT ABOUT B7 0 at 7 1 7 R ABOUT ABOUT 9 about ABOUT 7 about ABOUT 7 7 ABOUT ABOUT 32 ίο at 1 at 1 .0 ABOUT 9 ABOUT 7 ABOUT about ABOUT 7 7 about ABOUT 33 9 ABOUT about ο χο about about ABOUT ABOUT about ABOUT ABOUT about ABOUT 7 7 about about