SU1251259A1 - Three-phase a.c.voltage-to-d.c.voltage converter - Google Patents

Abstract

The invention relates to converter technology and can be used in secondary power supply sources with adjustable parameters on the input voltage side. The purpose of the invention is to improve the mass and size parameters and reduce losses. The device contains the main I and booster 14 transformers and a multiphase terminal 5, the output of which forms the output pins 6, 7. The secondary windings 2, 3 and 4 of the main transformer are connected to the input, rectifier 5. The primary windings 8, 9 and 10 transformer 1 is connected via secondary windings 11, 12 and, 13 booster transformer 14k to input terminals 15, 16 and 17 for connecting phases A, B to the mains. The switching switches 18, 19 and 20 are connected respectively between the input terminals 15, 16 and 17 and the first BijfMH outputs of the primary windings 21, 22 and 23 of the transformer. The second conclusions of the primary windings 21, 22 and 23 i (L

Description

through the switching keys 24,25,26 are connected to the input circuits of the corresponding phases. The shunt switches 27 to 32 are pairwise combined and each pair is connected in parallel to one of the windings 21, 22 and 23. In each pair of keys, a 27-32 point of their connection is connected to the input terminal for connecting the adjacent phase of the mains supply. Introduction of shunt and commi1

The invention relates to a conversion technique and can be used in secondary power supply sources with parameter control on the input side.

The purpose of the invention is to improve overall dimensions and reduce losses. .

The drawing shows a schematic diagram of the converter.

The three-phase AC-DC converter contains the main transformer 1, the secondary windings 2, 3 and 4 of which are connected to the multiphase rectifier 5 by the DC output connected to the output terminals 6 and 7. The primary windings 8, 9 and 10 of the transformer I, connected through the secondary windings 11, 2 and 13 booster transformer 14 to the input outputs 15, 16 and 17 (phases A, B, C). Switching keys 18, 19, and 20 are connected by one of the outputs to inputs 15, 16, and 17, and others to the first terminals of the primary windings 21, 22, and 23 of a booster transformer 14, and the second outputs of windings 21, 22, and 23 are connected via switching keys 24 , 25 and 26 to the input terminals of the corresponding phase, the shunting switches 27 and 28 of phase A are interconnected in series and connected to the winding 21. The shunt-in switches 29 and 30 of phase B are interconnected in series and connected to the winding 22, the shunt switches 31 and 32 of phase C are interconnected in series

251259

In the discrete control mode, three levels of voltage on the primary windings of transformer 1: linear input voltage, difference and sum of linear input voltage and voltage on windings 11-13 are obtained, thereby providing stepwise voltage regulation on the device output . 1 il.

directly and connected to the winding 23. The connection points of the keys 27 and 28, 29 and 30, 31 and 32 are connected to the input terminals 16, 17 and 13, respectively.

The Converter operates as follows.

In the discrete control mode, three states are possible. The first. the state corresponds to the closed position of the keys 18, 19, 20, 28, 30, 32 and the open position of the keys 24, 25, 26, 27, 29 and 31. In this state, the primary windings. 11, 12 and 13 of the booster transformer J 4 through The closed switches 18, 19, .20, 28, 30, and 32 are connected in a triangle circuit and connected to input terminals 15, 16, and 17 in such a way that the voltages on the secondary windings 11, 12, and 13 of the booster transformer 14 are in phase with the corresponding the voltage of the primary windings 8, 9 and 10 of the main three-phase transformer 1, the output voltage conversion The battery corresponds to the voltage on the primary windings of transformer 1, equal to the difference of the linear input voltage and voltage on the secondary windings 11, 12

and 13 booster transformer 14. The second state corresponds to

the closed position of the shunt switches 27, 28, 29, 30, 31, 32 and the open position of the keys 18, 19, 20, 24, 25 and 26. In this position, the input windings of the primary windings 21, 22 and 23 of the booster transformer 14 do not flow because the keys are shunted by keys 27 32 and the voltage on the windings 11, 12 and

13 is zero. The output voltage of the converter corresponds to the voltage on the primary windings 8, 9 and 10 of transformer 1, which is equal to the linear input voltage. The third state corresponds to the closed position of the keys 24, 25, 26, 27, 29 and 31. and the open position of the keys 18, 19, 20, 28, 30 and 32. In this state, the primary windings 11, 12 and

13parator Tpai format

14 through closed switches 24, 25, 26, 27, 29 and 31 are connected in a triangle pattern and connected to input terminals 15, 16 and 17 in such a way that the voltage on the secondary windings 11,

The 12 and 13 booster transformer 14 is in a phase with the corresponding voltages of the primary windings 8, 9 and 10 of the main three-phase transformer 1. The output voltage of the converter corresponds to the voltage on the primary windings of transformer 1 equal to the sum of the linear input voltage and voltage The secondary windings 11, 12 and 3 booster transformer 14.

Thus, in the discrete control mode, the converter circuit produces three levels of voltage on the primary windings of transformer 1: the linear input voltage, the difference and the sum of the linear input voltage and the voltage on the secondary windings of 11, 12 and 13 booster transformer 14 than and stepwise voltage control is provided at the output of the converter.

Editor M. Bandura Order 4423/55

Compiled by G. Maltsev

Tehred O. Gortvay Proofreader A, Obruchar

Circulation 631 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Claims (1)

Invention Formula The converter of three-phase alternating voltage into a constant, containing the main and the additional voltage transformers, a multi-phase power source, alternating current connected to the secondary windings of the main transformer, and direct current to output leads, main switching and main switches, connected in pairs in each phase in series, each point of which is connected to the first - to the primary output of the booster transformer, and each free output of the switching key forms an input output, the beginning of each primary winding of the main transformer through the secondary winding booster transformer is connected to the corresponding input cable, which is different from the fact that, in order to improve the overall dimensions and reduce losses, in each phase additional shunt and switching keys are connected, connected in series, and their connection point is connected to the second the output of the primary winding of the booster transformer, and the free BbSBOffbi of the primary and secondary shunting keys of each phase are combined and connected to the end of the primary winding of the same phase SIC transformer to the input terminal and the adjacent phase in their order of forward interleaving, free vtod each additional GOVERNMENTAL switching key is connected to the input terminal of the same phase.