SU1620995A1 - Device for monitoring voltage generator - Google Patents

Abstract

The invention relates to control devices for measuring voltage 18 and can be used in analog computers. The purpose of the invention is simplification. The device for controlling the voltage generator contains the first to the fourth amplifying transistors I, 2, 3, 4, the first and second output threshold elements 5, 6, the first bias resistor 7, the first and second load resistors 8, 9, the first limiting resistor 10, scale resistor 11, second limiting resistor 12, second bias resistor 3, third and fourth load resistors 14, 15, first and second reference zener diodes 16, 17, positive and negative input buses 18, 19. The device is based on comparison input voltage acting between the input buses 18, 19, with levels of four settings. 2 Il. § tf СЭ tsЈ ate her

Description

Fia: 1

The invention relates to control devices for measuring voltage, and can be used in analog computers.

The purpose of the invention is simplification.

FIG. 1 shows a functional diagram of a device for monitoring a voltage generator; in fig. 2 - time diagrams of signals.

FIG. 1 are the first to fourth amplifying transistors 1-4, the first and second output thresholds 5 and 6, the first bias resistor 7, the first and second load resistors 8 and 9, the first current-limiting resistor 10, the scale resistor 11, the second current-limiting resistor 12, the second bias resistor 13, the third and fourth load resistors 14, 15, the first and second zener diodes 16, 17, are positive and negative input buses 18, 19.

FIG. 2 shows: a) voltage on input buses 18, 19 and levels of four voltage settings; b) the voltages on the bases of the third and fourth amplifying transistors 3 and 4 with respect to the bus 19; c) the signal of the second output threshold element 6; d) voltage on the bases of the first and second amplifying transistors 1 and 2 with respect to the bus 18; d) the signal of the first output threshold element 5.

The device for controlling the voltage generator operates as follows.

If there is no voltage between the positive and negative input buses 18 and 19, the first and second output threshold elements 5 and 6 do not work, for example, LEDs. This state is maintained until the voltage between the input buses 18 and 19 (Fig. 2o) exceeds the value of the voltage of the second setting (Fig. 2a) specified by the second bias resistor 13 and the second reference Zener diode 17. At Thereby, the voltage at the base of the third amplifying transistor 3 increases (Fig. 26) and it begins to lock. The second reference Zener diode 17 has a small differential resistance compared to the third load resistor 14, which is necessary to provide a positive feedback factor greater than one. In the generation process, as in the Schmitt trigger, the voltage across the emitter of the third and fourth amplifying transistors 3 and 4 remains almost unchanged. The process proceeds as an avalanche after the current of the fourth amplifying transistor 4 increases to a value corresponding to providing a positive feedback factor of more than one.

The resistance value of the fourth load resistor 15 must be chosen from the condition that at a collector current of four

five

five

0

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Moreover, the amplifier transistor 4, which does not provide the necessary amount of feedback, the second output threshold element 6, which has a certain threshold, did not work. The third load resistor 14, which determines the value of the first hysteresis, ensures that the second output threshold element 6 is turned off while the voltage on the input buses 18, 19 (Fig. 2a) decreases to the first setpoint level equal to the second setpoint minus the hysteresis. This is due to the fact that when the voltage drops on the input buses 18, 19, the voltage on the base of the fourth amplifying transistor 4 is less by the amount of voltage drop on the third load resistor 14 when current flows through it when the voltage on the input buses 18 increases , nineteen.

Similarly, the first output threshold element 5 operates, which turns on when the fourth setpoint level is reached and turns off when the input voltage drops to the third setpoint (Fig. 2d, g). The voltage difference between the third and fourth settings constitutes the second hysteresis loop (Fig. 2c) and is set by the first load resistor 8.

The trigger levels can be adjusted by changing the magnitude of the second and first bias resistors 13 and 7, respectively, for the first, second, third, and fourth settings. The first bias resistor 7 and the first reference zener diode 16 set the values of the third and fourth settings. The waveforms in FIG. 2 characterize an example of the emergency operation of a device with a significant change in the monitored voltage and the processing of fault signals. In normal operation, the input voltage varies between the second and third settings.

FIG. The 2 proportions between the setpoint values and the hysteresis are distorted, so. As a matter of fact, the hysteresis is significantly less than the settings.

Claims (1)

Invention Formula A device for monitoring a voltage generator, containing the first and second amplifying transistors / rn-type conduction, the emitters of which are interconnected, the third and fourth amplifying transistors, to the collector of each of the amplifying transistors is connected the first terminal of the corresponding load resistor, the base of the first the amplifying transistor is connected to the first output of the first bias resistor, the first output of the first current-limiting resistor is connected to the base of the second amplifying transistor, The first amplifying resistor is connected to the first output of the second bias resistor, the first output of the second limiting resistor, the large-scale resistor, the first and second output threshold elements, the first and second zener diodes, characterized by the fact that the third and third emitters are connected to the base of the fourth amplifying transistor. the fourth amplifying transistors are interconnected and through a large-scale resistor connected to the emitter of the first amplifying transistor, the base of which is connected to the second The second terminal of the current-limiting resistor, the second terminal of the first current-limiting resistor is connected to the base of the third amplifying transistor, the second terminals of the first bias resistor of the first and second load resistors are interconnected and are the device's positive input bus; the second terminals of the second bias resistor of the third and fourth load resistors are connected interconnected and are the negative input bus of the device, the base of the second amplifying transistor through the first Zener diode connected in the forward direction is connected to the collector of the first amplifying transistor, the collector of the third amplifying transistor is connected via the second voltage Zener diode to the base of the fourth amplifying transistor , the first and second terminals of the first output threshold element are connected respectively to the first and second terminals of the second load p ican, first and second output terminals of the second threshold element are connected to first and second terminals of the fourth load resistor, and the third and fourth amplifying transistors are transistors p-n-p-type conductivity. - 3 ista rk  1 gist