SU1700745A1 - Pulser - Google Patents

Description

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The invention relates to a pulse technique and can be used in systems for measuring and diagnosing electrical quantities.

The aim of the invention is to expand the field of application by allowing the generation of rectangular and triangular pulses of varying amplitude with a change in control voltage.

The drawing shows a schematic diagram of a pulse generator.

The pulse generator contains the first 1, second 2 and third 3 operational amplifiers, the time setting RC-bridge 4 with capacitor 5 and resistors 6-8, nonlinear voltage divider 9, converter 10 of rectified voltage, input bus 11, common bus 12 The output bus 13 and the additional bus 14, while the non-inverting input of the first operational amplifier 1 is connected to the first output of the output diagonal of the input bridge 4, the inverting input to the non-inverting input of the second amplifier 2 and to the common bus 12, and the output through nonlinear sharing voltage carrier 9 - with the first output of the input diagonal of the RC bridge 4, with the input of the converter 10 of the rectified voltage value and with the output bus 13, the output of the converter 10 of the rectified voltage value is connected to the first input of the operational amplifier 3, the second input of which is connected to the input bus 11, and the output is connected to the control input of the nonlinear voltage divider 9, the inverting input of the operational amplifier 2 is connected to the second output of the output diagonal of the RC bridge 4, and the output to the second output of the RC diagonal of the 4 and additional body bus 14.

The generator works as follows.

When the supply voltage is applied, the output of the amplifier 1 is set to a voltage close to the level of either a positive supply voltage or a negative one (amplifier 1 is used as a comparator). If the voltage module at the first output of the input diagonal of the RC bridge 4 (the connection point of resistors 6 and 7) is less than the positive-voltage level at the input of the rectified voltage converter 10, the output voltage of the amplifier 3 reduces the division factor of the divider 9 voltage to a value at which the voltage at the inputs of the amplifier 3 becomes equal.

With a negative output voltage of the comparator (amplifier 1), the division factor of the divider 9 decreases and the voltage modules are equalized.

on the input bus 11 and at the output of the nonlinear divider 9; If the voltage module at the output of the nonlinear divider 9 exceeds the input voltage, then the division ratio of the divider 9 decreases to achieve equal voltages at the inputs of the amplifier 3. From the output of the amplifier 1 to the input of the nonlinear divider 9, a voltage is applied that is close to the supply voltage of the device (positive or

negative, since amplifier 1 performs the function of a comparator).

In this case, the nonlinear divider 9 can be considered as an amplifier of the output voltage of amplifier 1 (with an adjustable coefficient less than unity.

Thus, the voltage on the first output of the diagonal of the RC bridge 4, the modulus of which is equal to the input voltage on the input bus 11, is maintained at this level by the amplifier 3 covered by feedback through the divider 9 and the rectified voltage converter 10.

Since the supply voltage

the output voltage of amplifier 2 decreases linearly (with a positive output voltage of amplifier 1) to a negative voltage - Uo. at which

switch amplifier 1:

Uo-Uex.pj

(D

where UBX is the voltage on the input bus 11; R2 is the resistance value of the resistor 7;

R 3 is the resistance value of the resistor 8.

At the output of the nonlinear divider 9, a negative voltage is set, the modulus of which is equal to the voltage on the input bus 11. The output voltage of the amplifier 2 increases to positive

the level at which amplifier 1 is switched again.

In this case, the amplitude of rectangular pulses on the output bus 13 is equal to the input voltage UBX on the input bus 11.

The amplitude of the triangular voltage on the additional bus 14 is defined by the expression (1).

The voltage variation on the additional bus 14 during one half period (0; T1) is defined as

RTC

T1

/:

about

Ubx

where R1 is the resistance value of the resistor 6;

C - the value of the capacitor 5;

t is the current time from the beginning of the period T; L U + - voltage change on the additional bus 14 from

-Uo to + Uo,

or

one

R3

Dee + RJc-UxT1 2UBx R2 (2)

From (2) it follows that

T1 2R1C

R3 R2

(3)

Voltage variation D-bus

po

14 from + ix - U0 to -UBX. during

another half period (T1, T) is defined by the expression

 one

R1C

jUBxdt - 2UE

T1

R3

From (4) it follows that R3

R2

By adding (3) and (5), get T1 + T-T1 4R1

or T 4P1 C-§ 4 (6) to f.

The frequency fp of the generator can be determined from (6)

(7)

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The system does not depend on the parameters of the nonlinear divider, on the supply and input voltages.

Thus, the pulse generator 5 provides the ability to control and stabilize the amplitudes of the output voltages at a constant generator frequency. In addition to this, the generator provides a linear conversion of the 10R2 ratio

R 1 R3 to the frequency f0.

Claims (1)

When the amplitudes of the triangular and rectangular voltages are equal, and a non-inverting input of the comparator 1 forms a opposite-pole sawtooth voltage with an amplitude U0 UBX. An inventive pulse generator comprising 20 input and output buses, an operational amplifier whose non-inverting input is connected to the first output of the output diagonal of the time of the driving RC bridge, and the output is connected via a nonlinear voltage divider to the first output of the input diagonal of the driving of the RC- a bridge, characterized in that, in order to expand the field of application by allowing the generation of alternating-30 s in amplitude rectangular and triangular pulses when the control voltage is changed, an additional bus, a rectified voltage value converter, two 35 operational amplifiers are introduced, the non-inverting input of the second operational amplifier is connected to the inverting input of the first operational amplifier and - to the common bus, the inverting input is connected to the second output of the output diagonal, and the output - with the second output of the input diagonal, the time of the master RC bridge and the additional bus, while the output of the nonlinear voltage divider is connected to the 45 worm voltage converter of the rectified voltage value to the first th input of the third operational amplifier, a second input coupled to an input bus and an output -supravl yuschim input nelineynogodeli- 50 bodies voltage, wherein the output bus line is connected to the output of non-linear voltage divider.