SU520695A1 - Pulse generator - Google Patents

Description

(54)

PULSE GENERATOR

laei to the quantization step & (J and becomes equal to (2. Simultaneously, the pulse from comparator 2 is fed to the input of reset device 3. The accumulator capacitor of integrator 1 is discharged through the open transistor of reset device 3).

Eslk1pr oor (tnp is the duration of the integrator 1 motor run, i Qp is the continuation / return distance), the oscillation period r, V .tg

If the sun is regarded as some kind of initial voltage,

Ti start -tg-

The following equality of the voltages at the outputs of the integrator 1 and converter 4 enters at time t, (point k in Fig. 3).

At the same time T SK CC -I-CK.

Td T - (- uUtg X.

From here

Ilith uHaytg-. + Ca-iJAUtg.

By analogy with the previous one

  L / Ha4tgX - (fi-i) AUtgX (2}

Expression (2) is the nth member of an increasing arithmetic progression in which (we are the first member, D Utg is the difference.

2) The pulses from the comparator 2 through the switch 6 are fed to the subtractive input of the reversible counter 5 (position II of the switch). In this case, the process of forming the pulse sequence is described by the diagrams shown in FIG. four.

Using the above reasoning, you can deduce:

 - () AUtg :(. (3)

Expression (3) is the nth term of a descending arithmetic progression, in which UHOM ffo is the first term, D U tgfoC difference.

3) In this case, the output of comparator 2 is not connected to the inputs of the reversible counter 5 (switch 6 is in position W). The counter code does not change, so the voltage at the output of converter 4 is constant. The pulse period is constant and is determined by formula (1)

Since the rate of increase (decrease) of an arithmetic progression is determined by the difference, in the proposed generator the rate of change of the pulse follow-up period depends on the change in either of the two components determining the difference L and iff

In this pulse generator, the rate of change of the pulse period is controlled by the potentiometer of integrator 1. As the position of the potentiometer slider changes, the charge current of accumulator capacitor of integrator 1 changes, which leads to a change in the inclination angle X of the sawtooth voltage.

Claims (1)

Invention Formula The pulse generator containing a comparator, the output of which is connected to the input of the reset device, and one of the inputs is connected to the output of the integrator, the input of which is connected to the output of the reset device, characterized in that, in order to control the pulse frequency according to a given law, the pulse generator is entered a reversible counter, the addition and subtraction inputs of which are connected via a switch to the comparator output, and a code-voltage converter whose output is connected to the second comparator input, and the inputs are connected to the outputs counter. Rig. f FIG. 2