SU580629A1 - Infralow frequency pulse generator - Google Patents

Description

one

The invention relates to the pulse technique and can be used to create infra-low frequency pulse generators,

A known generator and infra-low frequency pulses, which contains the time-controlling cascade of one concatenated capacitor and current-setting and discharge transistors of different conductivity, connected in a regenerative circuit, a series-connected zener diode and a resistor, to the connection of which the base of the discharge transistor is connected, an electromagnetic relay, contacts which are included in the charge and discharge circuit of storage capacitor 1.

However, the known generator does not allow to obtain at the outputs of x three signals of the same following frequency, but different in the duty cycle. The presence of an electromagnetic relay complicates the circuit and reduces the reliability of the generator.

In order to expand the functionality of an infra-low-frequency pulse generator containing three times the driving cascade of current and discharge transistors of different conductivity types connected in a regenerative circuit, and a storage capacitor in a collector depot current transistor, shunted by series-connected zener and resistor, to the connection of which the base of the discharge transistor is connected, the time specifying the stages are connected in a ring circuit by diodes connected to the ring whoever discharges the transistor of the previous time of the master stage and to the connection of the capacitor and the stabilizer (the next time the master stage).

FIG. 1 is a schematic diagram of the generator; in fig. 2 - diagrams for the voltage of the generator at the outputs of the generator (continuous line) and on the storage capacitors (dashed line) of the generator.

Saderigig generator three times setting

a cascade, each of which consists of a current-setting transistor 1 (2, 3, respectively, for other cascades), for example, p-p-l type, a discharge transistor 4 (5, 6), for example, p-p-t-tin, a storage capacitor 7 (8, 9), series-connected Zener diodes 10 (lil, 12) and a resistor; 13; (14, 15), bypassing the storage capacitor. The base of the discharge transistor (feedback transistor) 4 (5, 6) is connected

to the connection of the Zener diode 10 (11, 12) and the resistor 13 (.14, il5), the emitter-to the power bus, the collector to the voltage divider of the resistors 16, 17 (18, 19; 20, 21), the current-limiting resistor 22 ( 23, 24) - to the base of current-setting transistor 1 (2, 3).

The time master circuits are interconnected; in an annular circuit, diodes 25, 26, 27 connected in series with current limiting resistors 28, 29, 30. Diodes 25, 26, 27 are connected in a conducting direction with respect to the polarity of the voltage on the plates of the storage capacitor. The generator outputs are indicated by the positions 31, 32, (33.

The operation of the Generator is considered for the case when the capacitances of the storage capacitors are equal, the charge current of the capacitor 7 is greater than the charge current of the capacitor 8, the charge current of the latter is greater than the charge current of the capacitor 9.

The parameters of the voltage dividers, the voltage values of the voltage; they are chosen in such a way that when the feedback transistors are closed, the potentials of their collectors are more negative than the plates of the storage capacitors connected to the diodes.

When the power supply is connected to the buses 34, 35 (the origin of the coordinates (Fig. 2), capacitors 7 and 9 begin to charge. By the time / s, the capacitor 7 is charged before the supply voltage (7p, approximately equal to the voltage of the zener diodes 10, 11 12, transistors 1, 4 are open, capacitor 8 is discharged, capacitor 9 is charged by the collector current of transistor 3 (Fig. 2, plots It, f / 8, 9, respectively).

At time tz, capacitor 9 is charged up to voltage t / n. The zener diode 12, the transistor 6, the diode 27 is opened, the capacitor 7 is discharged through the open transistor 6. The zener diode 10, the transistor 4, the diode 25 are closed. The capacitor 8 is charged by the current of the transistor i2.

At time is, the capacitor 8 is charged before the voltage (/ p. Zener diode 11, transistor 5, diode 26 opens, capacitor 9 is discharged through transistor 5, resulting in zener diode 12, transistor 6, diode 27 is closed and the capacitor starts to charge 8. The cycle repeats.

By choosing the constant times of the cascades, different or the same receive, respectively, different or identical pulse duty cycles at the output of each: cascade.

(plots f / 31, t / 32, t / 33, fig1. 2).

Continuous oscillation generation σ: provides a ring connection for only an odd number of stages, equal to or greater than three.

Claims (1)

Invention Formula An infra-low frequency pulse generator containing three times of a driving cascade from current-generating and discharging transistors of different conductivity types, connected via a regenerative circuit, and a storage capacitor in the collector circuit of the current-generating transistor, connected by series-connected zener diode and resistor, to the connection of which the base of the discharge transistor is connected , characterized in that, in order to extend the functionality, the time, the backing stages are connected; unity to the collector of the discharge transistor of the previous stage and the time zadayuschvgo to a compound of the capacitor and the zener posleduyu1schago time zadayushvgo cascade. Sources of information taken in. attention in the examination. USSR author's certificate J% 2668,16, cl. H, il969. 20