SU507830A1 - Device for converting parameters of passive non-resonant two-port networks - Google Patents

Description

(54) DEVICE FOR TRANSFORMATION OF PARAMETERS OF PASSIVE NON-RESONANT TWO-POLES

amplifier. The second terminals of all secondary windings of the current transformer and the first winding of the voltage transformer are connected to the common case, the output of the non-resonance two-terminal through the primary 5MCrtny current transformer is connected to the amplifier.

 The drawing is a block diagram of JCTpoftcTBa.

It contains a power source 1, a voltage transformer with two secondary windings 2, a nonresonant two-terminal 3 with a known Lemte 4 and unknown elements iS and 6, an amplifier 7, a capacitor 8 identical to the well-known element 4, a current transformer 9 with three secondary windings, an amplifier 10, an exemplary capacitor 11, a controlled divider 12, an exemplary resistor 13, two voltage meters 14 and 15, and a phase-sensitive indicatr 16.

The voltage from the output of the power source 1 goes to the primary winding of the voltage transformer 2, then from the first secondary winding through the two-port and the first winding of the current transformer 9 to the input of the amplifier 7, the feedback circuit of which includes capacitance C, and C C. (one)

If we neglect the ideality of the amplifier 7, then the current flowing through the two-terminal is equal to the current flowing through the capacitance C,

and the voltage at the output of amplifier 7 is equal to the voltage across the capacitance C of the two-terminal

G vg

juuC,

This is supplied to the second secondary of the first winding of the voltage transformer, where it is summed with the supply voltage; the result of summation is:

KBoUuCjj i-au.

II Uj

.WITH)

(RoCoK

(3)

Taking into account the expression (1) we get 1

Irjtt gaei

° g.

(M)

El

jWc

From the analysis of the discharge (4), it follows that the pressure on the transformed conductivity of the studied two-port device was obtained by artificial means.

This voltage is used as a reference for the decomposition of the current flowing through the two-pole circuit under study and is fed to the inputs of the voltage meters 14, 15 and the control input of the phase-sensitive indicator 16, to the signal input of which the voltage is applied from the output of the iO amplifier.

Current 1 is broken up at the input of amplifier 10, where this current is compensated by currents 1 and ij flowing through the reference capacitor 11 and the resistor J3, T.e.

(five)

i ijuj "tic

(6)

()

Output control

40 voltage divider 12 can be written as:

Uu

(eight)

ur to

where k is the transfer coefficient of the controlled voltage divider.

Solving jointly (5). (6), (7) subject to (8), we get

(9)

R, Cj)

,

At the moment of current compensation 1 by currents 1, and 1, voltage U will become in phase with voltage and, i.e.

g P tg PujCiO)

: Substituting into expression (10) the values of the tangents and solving the equations for; the divider transfer coefficient, we get:

L

TO

Roco

Taking into account the magnitude of the coefficient of transfer: giving the divisor of expressions (9) and (8) can be written in the form:

 , -. soB () C, 1-L (C1-C /

. )

,

()

The ratio of the voltages proportional to the current flowing through the transformed I conductor, and the voltages equal to the voltage on the transformed conductivity of the two-pole, are proportional to the parameters of the transformed conductivity, i.e.

I.C „and, 5

and

and.

and

or

CHI 13. and, -, ,,

 and .and

Claims (1)

Invention Formula A device for converting parameters of passive non-resonant two-component loungers containing a power source (connected to the primary winding of a voltage transformer with two secondary windings, one of which is connected to a non-resonant two-terminal device consisting of a series connection of capacitive conductivity and a parallel connection of active and capacitive conductors, the other secondary winding of one of the terminals connected to one of the inputs of a phase-sensitive indicator, an amplifier, in the feedback of which a capacitor is connected, an additional amplifier whose output is connected to one It consists of the inputs of a controlled splitter, an exemplary capacitor and a junction resistor, which is: with a speed circuit, it is equipped with a current transformer with three secondary windings, two voltage ratio meters, and the first inputs they are connected to the first input of the phase-sensitive indicator, the second input of the first measuring instrument of the voltage ratio dinene with the second input phase sensor: NO indicator and the output of the additional amplifier, the second input of the second voltage ratio meter connected to the output of the controlled divider to one from the conclusions of the reference resistor, the second output of which is connected to one of the terminals of the first secondary winding of the trans: current format, the first output of the second secondary winding through an exemplary condenser; the sator is connected to the output of the controlled Tselitel, the first output of the third secondary; the second terminals of all the secondary windings of the current transformer and the first winding of the voltage transformer are connected to the common case, the output of the non-resonant two-terminal through the primary current transformer attached, „o amplifier.