SU966875A2 - Amplifier-shaper - Google Patents

Description

(54) AMPLIFIER-FORMIR OVATEL

one

The invention relates to a pulse technique.

According to the main author. St. No. 614533 is known for an amplifier-form of an actuator containing a logic element, two transistors of opposite conductivity type, the base of one of which is connected to the collector of an IC type transistor, the emitter of which is connected to the output of the logic element, the input of which is connected to the input bus, transistor base through a resistor connected to the power source ClJ

This amplifier is inherently insufficient reliability.

The aim of the invention is to increase reliability.

The goal is achieved by the fact that the amplifier-forma- tor contains a logic element, one input of which is connected to the input bus and the output is connected to the emitter of the transistor of the conductivity type, the collector of which is connected to the base of the transistor ptym conductor, and the base is connected through a resistor to a power source, an integrating RC circuit and an inverter are introduced, the output of which is connected to

the second input of the logic element, the input of the inverter is connected to the capacitor of the integrating KS circuit, the input of which is connected to the input bus. :

The drawing shows the principal electrical circuit of the amplifier of the driver.

Amplifier spruce contains logic element 1, transistor 2

10 types of conductivity, resistor Zoo transistor 4p-l-type conductivity, inverter 5, integrating circuit of resistor 6 and capacitor 7.

The input signal is on bus 8,

15 and 9 and 10 are supplied with supply voltage.

The principle of operation of the amplifier is as follows.

2 &

In the absence of a pulse signal at the output of element 1, a logical unit level is formed. Transistors 2 and 4 are closed. At the same time, power consumption by transistors is not available25. there is.

Claims (1)

When the pulse signal arrives at the output of element 1, a logic zero level is formed. In this case, the emitter of transistor 2 becomes more negative than its base and depletes, Transistor 4 opens, because the collector current of transistor 2 is the switching base of transistor 4, and the supply voltage is transferred to the load by eliminating the voltage of the collector-emitter voltage of the transistor 4. An integrating circuit containing a 6-liter resistor, the time given by the capacitor 7, in the operating mode, in the presence of signals at the input of the amplifier-former, does not affect the operation of the amplifier, since the value of the capacitor 7 is chosen such that its charging time exceeds by several times the range of durations generated by the signals. In this case, the input of the inverter 5 constantly has a level of logical zero, and the second input of element 1 has a level of logical unit that allows output through the signal amplifier . In an emergency situation, an undesirable state may occur at the input of the amplifier, in which the logical element level is constantly present at the first input of element 1 and both transistors are in the open state. In this case, a thermal overload occurs and the output transistor fails. since a large, constant collector current flows through it, determined by the source voltage on the bus 10 and the load resistance (not shown). However, due to the presence of an integrating circuit and an inverter, after a time equal to the charging time of the capacitor 7, the logical unit level appears at the input of inverter 5, and the logical zero level at the second input of element 1. In this case, both amplifier transistors are closed, i.e. The amplifier's thermal protection increases, and hence its reliability. Claims of the Invention Amplifier-shaper according to auth. St. No. 614533, characterized in that, in order to increase reliability, an integrating ftc circuit and an inverter are inputted into it, the output of which is connected to the second input of the logic element, the input of the inverter is connected, to the capacitor of the integrating fee circuit, whose input is connected sources of information taken into account during the examination 1. USSR Author's Certificate No. 614533, cl. H 03 K 5/02, 03/03/78. th ill Hf№ttpiane