SU898615A1

SU898615A1 - Magnetotransistor switch

Info

Publication number: SU898615A1
Application number: SU792858632A
Authority: SU
Inventors: Владимир Андреевич Коровин
Original assignee: Предприятие П/Я Г-4018
Priority date: 1979-12-26
Filing date: 1979-12-26
Publication date: 1982-01-15

Description

(54) МАГНИТО-ТРАНЗИСТОРНЫЙ КЛЮЧ(54) MAGNETIC TRANSISTOR KEY

1one

Изобретение относитс к импульс/ной технике и может быть использовано в устройствах коммутации сильных токов.The invention relates to a pulse / noise technique and can be used in high current switching devices.

Известен магнито-транзисторный ключ, выполненный в виде двухтактного преобразовател с трансформатором тока в цепи положительной обратной св зи и управл ющим транзистором 1 ,A magneto-transistor switch, made in the form of a push-pull converter with a current transformer in a positive feedback circuit and a control transistor 1, is known,

Недостатком этого магнито-транзисторного ютйча вл етс сложность схемы силовой цепи и схемы управлени .The disadvantage of this magneto-transistor circuit is the complexity of the power circuit and control circuit.

Известен также магнито-транзисторный ключ, содержащий транзистор, включенный по схеме с общим эмиттером , и трансформатор тока, у. которого начало первичной обмотки соединено с коллектором транзистора, конец служит клеммой дл подключени нагрузки , а вторична обмотка включена в цепи базы транзистора. Дл уп- равлени магнито-транзисторным ключом в цепи вторичной обмотки включёТГ управл ющий транзистор 2.Also known is a magneto-transistor switch containing a transistor connected in accordance with a common emitter circuit and a current transformer, y. the beginning of the primary winding is connected to the collector of the transistor, the end serves as a terminal for connecting the load, and the secondary winding is connected to the base circuit of the transistor. To control the magneto-transistor switch in the secondary circuit, turn on the TG control transistor 2.

Недостатком данного магнито-транзисторного ключа вл етс сложность схемы и низкий КПД, св занный с потер ми энергии при коммутации длинных импульсов из-за насыщени ма(- нитопровода трансформатора тока.The disadvantage of this magneto-transistor switch is the complexity of the circuit and the low efficiency associated with the loss of energy when switching long pulses due to saturation (- current transformer nitro.

Цель изобретени - упрощение схемы и повышение КПД.The purpose of the invention is to simplify the circuit and increase efficiency.

Claims

The goal is achieved by the fact that in a magneto-transistor switch containing a transistor connected according to a common emitter circuit and a current transformer with the beginning of the primary winding connected to the collector of the transistor, the end serves as a terminal for connecting the load transistor, the secondary output of the secondary winding is connected to the emitter of the transistor, the extreme leads are connected via diodes of the same name electrodes to a common point, which is connected to the base of the transistor through a dros3 and the base the capacitor is connected to the end of the secondary winding. The drawing shows the principal electrical circuit of the magnetotransistor key. Magneto-transistor switch contents (um transistor 1, current transformer 2 with primary winding 3, the beginning of which is connected to the collector of transistor 1, and the output of the end with load 4, and secondary winding 5 whose middle output is connected to the emitter of transistor 1, and extreme the leads through diodes 6 and 7 are connected to a common point, forming a full-wave rectifier 8. The common connection point of diodes 6 and 7 through choke 9 is connected to the base of transistor 1, and between the base of transistor 1 and the extreme end of the secondary winding 5 is its end. cond The switch 10. The magneto-transistor switch operates as follows: To turn it on at the connection point of the cathodes of diodes 6 and 7 and the drosse 9, a control current of positive polarity is supplied, which through the choke 9 enters the base of the transistor 1. Throttle 9 limits the rate of increase of the base current, therefore the collector current increases relatively slowly and for some time transistor 1 is switched to active mode. During the presence of power transistor 1 in this mode due to the presence of positive feedback from the collector to the base y tran ican 1 via a current transformer and a capacitor 10 is advanced in a continuous wave mode generation. In order to ensure the stability of these self-oscillations, it is necessary to ensure amplitude and phase balance conditions. The phase balance is provided by antiphase switching of the windings 3 of the transformer in the base circuits and collector of the transistor 1. In this case, the capacitance of the capacitor 10 is chosen large enough so as not to introduce noticeable phase shifts. The amplitude balance condition is satisfied if the current gain of transistor 1 exceeds the transformations of current transformer 2; when transistor 1 is operating in the generation mode, a secondary voltage appears on the secondary winding 5 TpaHC0opMatopa 2, which is rectified by diodes 6 and 7 and through a choke 9 goes to the base, putting the transistor 1 into a state close to saturation. After the control current is turned off, the transistor 1 remains in this state, since the constant base current necessary for maintaining this state is obtained by rectifying the self-oscillations. To ensure high efficiency of the device, the parameters of the circuit elements are chosen so that the amplitude of the alternating voltage on the collector of transistor 1 is insignificant. To disconnect the magneto-transistor switch, it is sufficient to apply a switching-off impulse of a control current of negative polarity with an amplitude exceeding an amplitude exceeding the amplitude of the current in the inductor 9 and a duration sufficient to decrease the current in it to zero. In this case, the generation stops, the collector current of the transistor 1 disappears and the Magneto-transistor switch remains in the off state until the next trigger pulse arrives. Introduction of a rectifier and an alternating current feedback circuit to the magneto-transistor switch allows one to obtain any duration of the on state of the power transistor without the use of an auxiliary transistor. This leads to a simplification of the device and an increase in its efficiency by eliminating power losses in the auxiliary transistor. The invention includes a magneto-transistor switch containing a transistor connected according to a common emitter circuit and a current transformer, the beginning of the primary winding of which is connected to the collector of the transistor, the end serves as a terminal for connecting the load and the secondary winding is included , in order to simplify the circuit and increase the efficiency, the secondary output of the secondary winding is connected to the emitter of the transistor, the extreme leads are connected via diodes of the same name electrodes to a common point, which is through a choke dinene with the base of the transistor, and the base through 5 capacitor connected to the end of the secondary winding. Sources of information taken into account in the examination of 8986154 1. UK application (f 1362271, class, N 3 T, 197. 2, USSR Author's Certificate No. 855b2, class H 03 K 17/60, 1975.

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