SU1465957A1 - Triangular voltage generator - Google Patents

Abstract

The invention relates to a pulse technique and can be used, for example, in measuring devices. The aim of the invention is to increase the stability of operation of the generator by compensating for the effects of time delays in the elements, increasing the stability of the output frequency while simultaneously expanding the functionality by providing frequency tuning. The generator is implemented based on integrator 2, control key 1, threshold element 3, subtractor 6, or adder. The output frequency of the generator depends only on the ratio of the values of the resistors of the voltage dividers 5, 7, and therefore does not depend on the control reference voltage, switching hysteresis of the threshold element. 2 a, p. flts2il. (L SP with SP

Description

The invention relates to: pulse technology and can be used for example, in devices of measuring equipment,.

The goal of the invention is to increase the stability of the generator by compensating for the effects of time delays in elements of increasing the stability of the output frequency while expanding the functionality by providing frequency tuning.

Figure 1 shows the structural diagram of the proposed generator, "containing the subtractor in figure 2 - the same, containing the adder.

The generator contains a controllable key; 15 which is connected to the input of the integrator 2, the output of which is connected to the first input of the threshold element 3, the output of which is connected to the control input of the control key 1, whose input is connected to the first output of the source 4 of the reference voltage the reference voltage is connected to the second and third inputs of the threshold element 3, respectively,

In a generator whose structural circuit includes a subtractor, the source 4 (FIG. 1) of the reference voltage contains the first voltage divider 5, the subtractor 6, the second voltage divider 7, the first output of which is connected to the second output and the second output to the third output of the source 4 of the reference voltage, and the input with the output of the subtractor 6, the first input of which is connected to the power bus 8 and the input of the first voltage divider 5, the output of which is connected to the second input of the subtractor 6 and the first output of the source 4 of the reference voltage.

In the generator, the structural circuit of which includes an adder, the source 4 (FIG. 2) of the reference voltage contains the first divider 5, the adder 9, the second divider 7, the first and second outputs of which are connected to the second and third outputs of the source 4 the reference voltage, and the input is connected to the power bus 8 and the initial voltage of the adder 9 whose output is connected to the input of the first voltage divider 3, the output of which is connected to the second input

the house of the adder 9 and the first source of the source 4 of the reference voltage.

The first voltage divider 5 is made on resistors 10 and 11. The second voltage divider 7 is made on resistors 12-14. The subtractor 6 is inscribed on the resistors 15-18 and the operational amplifier 19.

The adder 9 is implemented on the resistors 20-23 and the operational amplifier 24.

As a threshold element 3, a Schmitt trigger or a comparator can be used, having a signal input and two threshold threshold control inputs and implemented, for example, based on a controlled attenuator, the input of which is connected to the reference voltage source bus, and a control input with a bus additional source.

The generator works as follows.

For the circuit design option of voltage dividers 5 and 7 and subtractor 6 shown in FIG. 1, the voltage at the output of the first voltage divider 5 is

Uy m-Uon where UQP is the voltage on bus 8;

m

R

ff

Rfo + r ,,

where r

 and R j - the resistance values of the resistors 11 and 10. at the output of the subtractor

Voltage 6 equals

and

on

- n and

Have

Where

45

„Iis p - p-

where R and R

five

18

- the resistance values of the resistors 15 and 18.

The difference in voltage at the outputs of the second divider voltage 7, and, consequently, the switching hysteresis of the threshold element 3 is equal to

UTP

 BdiKA on 1

and

8Ы)

Where

one

Rij

i K.

where is r,

, 4 - resistance values of resistors 13, 12 and 14. The joint solution of the equations gives an equation for finding the output frequency of the generator:

The joint solution of the equations gives the expression for the generator output frequency:

m

- & W

kl (1-nm) + mT,

m

out

k 1 (1 - m) + m T,

one

where Tj is the time delay of the signals in the elements of the generator, If conditions are met

Tj k 1

we have:

m

 - 6 OUT 1 I

whence it follows that the output frequency of the generator depends only on the ratio of the values of the resistors of the voltage dividers, and therefore does not depend on the control reference voltage and the switching hysteresis of the threshold element, i.e. the stability of the output frequency of the generator increases.

When implementing the first voltage divider 5, a converter is obtained in the form of a potentiometer, i.e. the position of the potentiometer slider — frequency When the first voltage divider is implemented, the voltage on the multiplying digital-to-analog converter is converted to a code-frequency converter.

For circuit design of voltage dividers 5 and 7 and adder 9 shown in Fig. 2, the voltage difference at the outputs of the second voltage divider 7, and hence the switching hysteresis of the threshold element 3, is equal to

liter ivykA-ivkl 1 UOH.

The output voltage of the adder 9 is equal to

and

out

Uon + n Uv ,,

Where.

P

RI; R

ten

where R.i3 is 10 resistance values of resistors 23 and 20.

The voltage at the output of the first divider 5 voltage is equal to

and V m-U

Sbit

similar to the above expression.

Claims (3)

1. A triangular voltage generator containing a controllable key, the output of which is connected to the input of the integrator, the output of which is connected to the first input of the threshold element, the output of which is connected to the control input of the control key, the input of which is connected to the first output of the reference voltage source, characterized in that expanding the functionality, the second and third outputs of the voltage source are connected to the second and third inputs of the threshold element, respectively. 2. The generator according to claim 1, that is, that the source of the reference voltage contains the first voltage divider, the subtractor, the second voltage divider, the first output of which is connected to the second output, and the second output - to the third output of the source the reference voltage, and the input - with the output of the subtractor, the first input of which is connected to the bus power supply and the input of the first voltage divider, the output of which is connected to the second input of the subtractor and the first output of the source of the reference voltage. 3. The generator according to claim 1, which is based on the fact that the source of the reference voltage contains the first voltage divider, adder, the second voltage divider, the per and second outputs of which are connected to the second and third outputs of the voltage source, the input to the power bus, the first input of the adder, the output of which is connected to the input of the voltage divider, the output of which is connected to the second input of the adder and the first output reference voltage source. FIG. I