SU1422386A1 - Electric gate - Google Patents

Abstract

The invention relates to a pulse technique and can be used in computing devices, mechanics and automation. The purpose of the invention is to expand the range of operating currents and reduce power loss. The electronic switch in the conducting state ensures the flow of load current through parallel-switched emitter junctions — the second collectors of transistors 2, 3. The introduction of second collectors leads to the exclusion of the load current from the high-impedance basic areas of these transistors and to the reduction of the internal resistance of the key. 1 il.

Description

dao-

(L

The invention relates to a pulse technique and can be used in various devices of computer technology, telemechanics and automation.

The purpose of the invention is to expand the range of operating currents and reduce power loss.

The drawing shows the electrical circuit of the electronic key.

The electronic key contains the corresponding first 1 and. the second 2 transresors of the same conductivity type, the third transistor 3 of the opposite type; conduction, diode 4, first 5 and second 6 resistors, respectively, the emitter of the third transistor 3 is connected via the second resistor 6 to the power supply bus 7, the output bus 8 and the second collector of the second transistor 2, the base and the first collector respectively to its first collector and base, the second collector has a common bus to which the emitter of the first 1 and second 2 transistors and the first terminal of the first resistor 5 are connected, the second terminal of which is connected to the first, input bus 9 and the base of the first transistor 1, the collector of which is connected to the base of the second the transistor 2 and through the diode 4 with the second input bus 10..

The electronic key works as follows.

In the initial state, a positive pulse arrives at the base of the first transistor 1 from the first input bus 9, and is not present at the second input bus 10. In this case, the first transistor 1 is in the saturation state and closes the second transistor

2, the third transistor, zistor 3, is locked as a result; the electronic key is in a non-conducting state.

When a positive pulse is removed from the first input bus 9 and received111

In the case of a positive pulse to the base of the second transistor 2 from the second input bus 10 through the diode 4, the first transistor 1 is locked, the second transistor 2 opens and its collector currents occur. The first collector current opens the third transistor

3, which, by the current of its first collector, opens the transistor 2 even more. An avalanche-like process of switching on the key arises due to the positive feedback that is performed by the first collectors of transistors 2 and 3, both transistors

transition t to naïpcetse mode. In this case, the load current is mainly mine high impedance base areas, flows through the emitter circuit - the second collectors of the second 2 and third 3 transistors, for which the areas of the second collector junction are several times larger than the area of the first collector junction.

Since through the base areas

transistors 2 and 3 flow a smaller part of the load current, the effect of the large volume resistances of the base regions of the transistors 2 and 3 on the internal resistance of the key in the conducting state decreases, the power losses in it decrease,

The key returns to its initial state when a positive pulse arrives at the first input bus 9 and a positive pulse is removed from the second input bus 10.

Thus, the introduction of the second collectors of the second 2 and third 3

transistors and their connection, respectively, with the output bus 8 and the common bus leads to the exclusion from the load current circuit of high-resistance base regions of the transistors. This allows

expand the range of operating currents of the key, now the load current is not limited to the sum of the maximum allowable base currents, while reducing the internal resistance of the key

in the conducting state, power loss therein is reduced.

Claims (1)

Formula image shadow An electronic switch containing the first and second transistors of the same conductivity type, the third transistor of the opposite conductivity type, the diode, the first resistor, the second resistor, the first terminal of which is connected to the power bus, the second - to the output bus and the emitter of the third transistor, the base of which is connected to the first collector of the second transistor;  and the first collector - with the base of the second and the collector of the First transistor, the base of which is connected to the first input bus, the emitter - with the emitter of the second transistor, with a second terminal 3 1A22386 the first resistor and the common bus; the anodo the second and the third transistors; the codiode is connected to the second input bus; they are connected respectively to the external one, characterized by the base and common busbars of the first that, in order to expand the range and the second transistors are connected working currents and reduction of losses with the first output of the power, introduced the second collector of the resistor and the cathode of the diode.