SU1203657A1

SU1203657A1 - Transistor switch

Info

Publication number: SU1203657A1
Application number: SU843746904A
Authority: SU
Inventors: Виктор Романович Бирюков
Original assignee: Предприятие П/Я В-2431
Priority date: 1984-06-01
Filing date: 1984-06-01
Publication date: 1986-01-07

Description

Изобретение относитс к электротехнике и может быть использовано в системах электропитани и электропривода.The invention relates to electrical engineering and can be used in power supply and electric drive systems.

Цель изобретени - повышение надежности путем уменьшени мош,ности рассе ни на основном транзисторе при его включении .The purpose of the invention is to increase reliability by reducing the scattering power of the main transistor when it is turned on.

На чертеже изображена схема предлагаемого ключа.The drawing shows the scheme of the proposed key.

Транзисторный ключ содержит основной транзистор 1, переход эмиттер - база кото- рого соединен с выходом блока 2 управлени через балластный резистор 3. Параллельно переходу эмиттер - база транзистора 1 подключены последовательно соединенные вспомогательный транзистор 4 и запираюш.ий конденсатор 5. База транзистора 4 подключена к точке соединени основного 6 и .дополнительного 7 резисторов, соединенных между собой последовательно, подключенных через первый диод 8 к выходу блока 2 управлени и шунтированных вспомогатель- ным конденсатором 9. Дополнительна обмотка 10 подключена к второму диоду 11, а третий диод 12 подсоединен к базе транзистора 1. Конденсатор 13 подключен между эмиттером транзистора 1 и коллектором транзистора 14, переход база - эмиттер шун- тирован встречно включенным третьим диодом 12 и включен между выводом выхода блока 2 управлени и базой транзистора 1.The transistor switch contains the main transistor 1, the emitter junction - the base of which is connected to the output of control unit 2 via a ballast resistor 3. Parallel to the emitter junction - the base of transistor 1 is connected in series with auxiliary transistor 4 and the locking capacitor 5. The base of transistor 4 is connected to the connection point of the main 6 and additional 7 resistors connected in series, connected via the first diode 8 to the output of control unit 2 and shunted by the auxiliary capacitor 9. The additional winding 10 is connected to the second diode 11, and the third diode 12 is connected to the base of transistor 1. Capacitor 13 is connected between the emitter of transistor 1 and the collector of transistor 14, the base – emitter junction is shunted by the third diode 12 and connected between the output of block 2 control and base of the transistor 1.

Транзисторнь й шим образом.Transistor shim way.

ключ работает следую key works follow

При открываюш,ей пол рности напр жени управлени (плюс у начала обмоток) транзистор 1 открываетс через переход эмиттер - база транзистора 14 и резистор 3. Конденсатор. 13, зар женный в предыдуш.ий полупериод, разр жаетс через транзистор 14 и переход эмиттер - база транзистора 1. Ток базы при этом определ етс величиной напр жени на конденсаторе 13 и сопротивлением контура конденсатор 13 - транзистор 14 - переход база - эмиттер транзистора 1. Этот ток увеличивает скорость насышени транзистора 1 и уменьшает врем его включени , а следовательно, уменьшаетс мощность рассе ни и повын аетс надежность .When opened, the polarity of the control voltage (plus at the beginning of the windings) to it transistor 1 is opened through the transition emitter-base transistor 14 and resistor 3. Condenser. 13, the half-period charged in the pre-air period, is discharged through the transistor 14 and the emitter-to-base transition of the transistor 1. The base current is determined by the voltage on the capacitor 13 and the loop resistance of the capacitor 13 - transistor 14 - base-to-emitter junction of transistor 1 This current increases the rate of rise of transistor 1 and reduces its turn-on time, and consequently, power dissipation decreases and reliability increases.

По окончании действи отпирающего и.мпульса транзистор 4 открываетс напр жением на резисторе 6 и подключает конденсатор 5 к переходу э.миттер - база транзистора 1, обеспечива его форсированное закрытие. Диод 12 создает контур в момент запирани транзистора 1 от обмотки управлени , когда при смене пол рности на об- .мотке управлени происходит дополнительное рассасывание неосновных носителей из области базы транзистора 1.Upon termination of the triggering impulse, transistor 4 opens with voltage across resistor 6 and connects capacitor 5 to the emitter-to-base transition of transistor 1, ensuring its forced closing. Diode 12 creates a circuit at the moment of locking the transistor 1 from the control winding, when, when changing the polarity on the control winding, additional resorption of minority carriers from the base area of transistor 1 occurs.

Claims

A TRANSISTOR KEY containing a main transistor, a control unit with an input transformer, the first terminal of which secondary winding is connected through a ballast resistor to the emitter of the main transistor, a blocking voltage block made on the auxiliary transistor, the locking capacitor, the first diode, the main and additional resistors, and the auxiliary capacitor, moreover, the locking capacitor and auxiliary transistor are interconnected in series and connected in parallel to the emitter junction - the base main transistor, the first diode and auxiliary capacitor are connected in series and connected between the base of the main transistor and the first terminal of the secondary winding of the transformer, the main and additional resistors are connected in series and connected in parallel with the auxiliary capacitor, the ballast resistor is connected between the auxiliary capacitor output and a common point connecting the emitters main and auxiliary transistors, and the base of the auxiliary transistor is connected to the connection point of the main ovnogo and additional resistors, characterized in that, in order to increase reliability by reducing the power dissipation on the main transistor when it is turned on, an additional winding on the transformer of the control unit, a second and third diode and an additional capacitor and transistor are introduced, while the second diode and additional capacitor § connected in series and connected to the additional winding of the transformer ~, the base-emitter junction of the additional transistor is shunted by the third diode turned on and on it is between the second terminal of the secondary winding of the transformer and the base of the main transistor, and an additional capacitor is connected between the collector of the additional transistor and the emitter of the main transistor.

SU „„ 1203657