SU1332492A1

SU1332492A1 - Noncontact converter for feeding electroplating baths

Info

Publication number: SU1332492A1
Application number: SU864002407A
Authority: SU
Inventors: Игорь Андреевич Исиченко; Владимир Яковлевич Гладченко; Владимир Николаевич Блезнюк
Original assignee: Харьковский Институт Механизации И Электрификации Сельского Хозяйства
Priority date: 1986-01-07
Filing date: 1986-01-07
Publication date: 1987-08-23

Abstract

Изобретение относитс к области электротехники и может быть использовано в качестве преобразовател дл питани гальванических ванн. Цель изобретени - повышение КПД в режиме работы на асимметричном токе. Преобразователь содержит трансформатор с трехфазной соединенной в звезду первичной обмоткой и двум трехфазными вторичными обмотками, соединенными в две обратные звезды, две группы из тиристоров 1-3 и 4-6, блоки 9, 10 управлени тиристорами, коммутационные элементы (КЭ) 11-20, уравнительный реактор 21 со средним вьшодом и приборы контрол анодного и эффективного токов 7, 8 соответственно. Аноды тиристоров 1-3 и 4-6 объединены через КЭ 20. Катоды тиристоров 4-6 через КЭ 11-13 соединены с концами второй вторичной обмотки трансформатора , а через КЭ 17-19 и прибор контрол анодного тока 7 - с отрицательным выходным выводом. Аноды тиристоров 4-6 через КЭ 14-16 соединены соответственно с катодами тиристоров 1-3 и началами первой вторичной обмотки . Введение КЭ 12,13,15,16,17, 18 позвол ет дополнительно снимать полезную мощность с трансформатора за счет использовани в процессе гальванического покрыти трехфазного тока первой вторичной обмотки в режиме асимметричного тока. 1 ил. с (ЛThe invention relates to the field of electrical engineering and can be used as a converter for powering electroplating baths. The purpose of the invention is to increase the efficiency in the asymmetric current mode. The converter contains a transformer with a three-phase star-connected primary winding and two three-phase secondary windings connected into two reverse stars, two groups of thyristors 1-3 and 4-6, blocks 9, 10 of the thyristor control, switching elements (CE) 11-20, equalization reactor 21 with medium output and control devices for anodic and effective currents 7, 8, respectively. The anodes of thyristors 1-3 and 4-6 are connected via CE 20. The cathodes of thyristors 4-6 through CE 11-13 are connected to the ends of the second secondary winding of the transformer, and through CE 17-19 and the anodic current monitor 7 with a negative output terminal. The anodes of thyristors 4-6 through CE 14-16 are connected respectively to the cathodes of thyristors 1-3 and the beginnings of the first secondary winding. The introduction of CE 12,13,15,16,17, 18 makes it possible to additionally remove the useful power from the transformer due to the use of the first secondary winding during the galvanic coating of the three-phase current in the asymmetric current mode. 1 il. with (L

Description

) t) t

V V

Изобретение относитс к электротехнике и может быть использовано в качестве источника питани гальванических ванн.The invention relates to electrical engineering and can be used as a power source for electroplating baths.

Цель изобретени - повышение КПД преобразовател в режиме работы на асимметричном токе.The purpose of the invention is to increase the efficiency of the converter in the asymmetric current mode.

На чертеже приведена принципиальна схема бесконтактного преобразовател .дл питани гальванических ванн.The drawing shows a schematic diagram of a contactless converter for feeding electroplating baths.

Преобразователь содержит трехфаз- ный трансформатор с одной первичной и двум вторичными обмотками, кажда из которых соединена по схеме звезда К началам первой вторичной обмотки подключены тиристоры 1-3 первой группы , к концам второй вторичной обмотки - тиристоры 4-6 второй группы. Прибор контрол анодного тока 7 и прибор контрол эффективного тока 8 включены в выходные цепи. Блоки 9 и 10 управлени соединены с управл ющими электродами тиристоров 1-6. Тиристоры 4, 5 и 6 соединены с фазами второй вторичной обмотки через коммутационные элементы 11, 12 и 13 соответственно . Адоды тиристоров 4-6 через коммутационные элементы 44-16 соединены с катодами тиристоров 1-3, а через коммутационные элементы 17- 19, а также прибор 7 контрол анодного тока 7 - с вторым отрицательнымThe converter contains a three-phase transformer with one primary and two secondary windings, each of which is connected according to a star circuit. The thyristors 1-3 of the first group are connected to the beginning of the first secondary winding, and the thyristors 4-6 of the second group are connected to the ends of the second secondary winding. An anode current control device 7 and an effective current control device 8 are included in the output circuits. Control units 9 and 10 are connected to the control electrodes of thyristors 1-6. Thyristors 4, 5 and 6 are connected to the phases of the second secondary winding through switching elements 11, 12 and 13, respectively. The thyristor 4-6 adodes are connected through the switching elements 44-16 to the cathodes of the thyristors 1-3, and through the switching elements 17-19, as well as the anodic current control device 7, to the second negative

выходным выводом и общей точкой сое- гальванического покрыти трехфазногоthe output pin and the common point of the co-galvanic coating of the three-phase

тока первой вторичной обмотки в режиме асимметричного тока, что повышает его КПД в целом до 95%.the current of the first secondary winding in the mode of asymmetric current, which increases its efficiency as a whole to 95%.

Claims

40 claims

Dynenium anodes thyristors 1-3. Between the common points of connection of the thyristor anodes, switching element 20 is included. Equalizing reactor 21 is connected between the zero points of the stars, the secondary windings of the transformer, and its middle point is connected to the first positive output terminal through the effective current control device 8.

The Converter operates as follows.

At the initial moment, when it is necessary to conduct an ironing process on an asymmetric current, switching elements 11-13 disconnect the power circuit of thyristors 4-6, switching elements 14-16 connect thyristor anodes 4-6 to thyristor cathodes 1-3 and transformer windings, and thyristor cathodes 4-6 with switching elements 17-19 through the control device 7 - to the common output terminal with thyristors 1-3. Switching

Non-contact converter for electroplating bath containing a step-down transformer with

45 three-phase star-connected primary winding and two three-phase secondary windings, each of which is connected into a star, a surge reactor, with an average output through

5Q device for controlling the effective current connected to the first output terminal and connected between the zero points of the stars of the secondary windings of the transformer, two groups of thyristors of three

gg thyristor in each group, the switching element of the switching element and two thyristor control units of the respective groups, the anodes of the thyristors of the first group are combined into a common

element 20 disconnects the common connection points of the anodes of the thyristor groups 1-3 and 4-6. When the thyristors are turned on by blocks 9 and 10 of the control, the thyristors 1-3 and 4-6, connected in opposite directions, make it possible to obtain a reverse pulse due to the share of one-period rectified three-phase current of the first secondary winding. The duration of the forward and reverse pulses over a period is regulated by known circuits. Control pulses, including 5 e thyristors 1-6, are formed in blocks 9 and 10 and synchronized with the voltage of the phase windings in which the thyristors are included.

If it is necessary to conduct the process at a direct current, the switching elements 11–13 turn on the thyristor power circuits 4–6, the switching elements 14–16 and 17–19 disconnect the thyristors 4–6 from the windings of the first rectifier transformer, and the switching element 20 connects common points of connection of the anodes of thyristor groups 1-3 and 4-6. The inclusion of thyristors by control blocks 9 and 10 on the cathodes of the first appears to be the highest voltage.

The proposed converter makes it possible to additionally remove the useful power from the transformer due to the use in the process

gg thyristor in each group, the switching element of the switching element and two thyristor control units of the respective groups, the anodes of the thyristors of the first group combined into a common

the point connected to the second output terminal, their cathodes are connected to the corresponding free phase outputs of the star of the first secondary winding of the transformer, which are the beginnings, the anodes of the second and third thyristors of the second group are united into a common point, the cathode of the first thyristor of this group is connected through the first switching element to the first of the free phase terminals of the second secondary winding being the ends, and through serially connected second

switching element and the device of the winding 15 and the cathode of the third

Anode current with a second output terminal, the anode of this thyristor is connected to the cathode of the first thyristor of the first group, characterized in that, in order to increase the efficiency in the asymmetric current mode, six switching elements are additionally introduced, and the anode of the first thyristor of the second group connected to the common connection point of the anodes of these thyristors of this group

Editor V.Danko

Compiled by L. Ustinkina Tehred V. Kadar

Order 3845/53

Circulation 659 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

2492

fourth switching element. between the indicated common points of connection of the anodes of the thyristors of the first and second groups, the fifth switching element is connected between the free output of the second phase of the second secondary winding and the cathode of the second thyristor of the second group, the anode connected through the sixth switching element to the cathode of the second thyristor of the first group, the seventh the switching element is connected between the free end of the third phase of the second inlet.

the thyristor of the second group, the anode connected through the eighth switching element to the cathode of the third thyristor of the first group, and through the ninth and tenth switching elements the cathodes of the second and third thyristors of the second group are respectively connected to the common connection point of the second switching element and

20 ka.

25. device control anode

Corrector L. Beskid