SU1250968A2 - Method of measuring ratio of two voltages - Google Patents

Abstract

The invention relates to the field of measurement technology and is complementary to the author. St. No. 1120248/21. The purpose of the invention, the extension of functionality, is achieved by making it possible to measure the product of voltages and the square of a larger measured voltage. According to the method, the second exponentially falling voltage (EPI) is compared with the measured voltages and, at the moments when the second ESP is equal to the larger and smaller measured voltage, they measure the value of the first ESP. A device that implements the method contains sources 1 and 2 of the first and second EPNs, respectively, null organs 3-6, keys 7, B and 9, drivers 10, II and 12, first and second sources 13 and 14 of the measured voltages, respectively recorder 15. 2 Il. (C (L 7yc / J

Description

The invention relates to electrical measuring equipment and is in addition to the author. St. No. 1120248.

The purpose of the invention is to enhance the functionality by making it possible to measure the product of stresses and the square of a larger measured voltage.

FIG. 1 shows timing diagrams explaining the proposed method; Fig. 2 is a block diagram of a device for its implementation. The method is as follows.

Form two exponentially falling voltages

Ujt) Uoexp (- I-), (t) Upexp (-).

The voltage U.,;, (T) begins to form

at time t and compared with the measured stresses and and ,,.,. (U8k: 4 U.j ..). At the moment of time

onality

or

 "to

lJ ,, (t) K-U

Bk

and

1 / and

txa

(P)

t / k When the voltage U (t) is At time tj, when U,

equal to the voltage U ,,, start to form equal to and,, is measured

U32 (t), which is also a com-value and, (t, K, which is according to

ny with stresses Ug and Ug) (, j.

The voltage U, (t) is comparable to

sc. Ujjj and are moments of time t. and

t.

and

Bx i

apr (- J), (I)

 four. (--)

At times t. and t.

35

and

, (t) Uoexp (- -),

t

T

and

(3)

(4) U, exp (- -) .. (4) In addition, the values

and „, U, exp (-V-). (five)

Solving equations (l), (3) and (5) together, we get

U ,, (tJ,

and.

and solving together equations (2), (4) and (5), we get

and,. (four )

- Ufrjf4 UfeyZ

and.

Consequently, U (tj) is proportional to the square of the larger of the e-Mijx stresses, and U (t) is proportional to the product of Uj and Uj.

The time constants and fj of the first and second exponentially falling stresses, respectively, can be chosen by the ratios

method for the main auth. St., proportional to the ratio of the measured stresses Ug and, 3Q A device that realizes; its proposed method contains sources 1 and 2 of the first and second exponentially falling voltages, respectively (2) but zero-bodies 3-6, keys 7, 8 and 9, the formers 10, P and 12, the first and second sources 13 and 14 of the measured voltages, respectively, the recorder 15.

The first combined inputs of null 40 organs 3 and 5, 4 and 6 are connected to the outputs of sources 13 and 14 of the measured voltages, respectively, to the second inputs of null organs 3 and 4 — the output of source 1 exponentially falling voltage, the Start input of which is connected to the external startup input of the device. The second inputs of the zero-organs 5 and 6 and the signal input of the switch 7 are connected to the output of the source 2 50 of the exponentially falling voltage. The output of the zero-organ 3 is connected to the input of the Start of the source 2, the output of the zero-organ 4 through the driver 10 is connected to the control input of the switch -7, the output of which is connected to the second input of the recorder 5. The output of the zero-organ 5 through the driver 11 is connected to the control key entry

(7)

,

P:

- ) P

(8) (9)

where n is any integer (, 2,

3 ...). When accounting (8)

rt-f l

ICh- | , y, n + - k, and

(ten)

where K - rrfj coefficient is proportional

domesticity

or

Wa, (t2) -K,

and,

- / -V H Ug, (t,) K.Uj, -U ,,,.

When considering the ratio (9)

and ,, (t,) K, -u7

i

(P)

(12)

where K TpTTrt is proportional

and

U

onality

or

lJ ,, (t) K-U

Bk

and

1 / and

txa

time tj when

12

8, and the zero-organ output b through the driver 12 to the control input of the key 9. The signal inputs of the keys 8 and 9 are combined and connected to the output of source 1, the outputs of the keys 8 and 9 are connected to the first and third inputs of the recorder 15, respectively. Inputs Stop sources I and 2 are connected to the output of the driver 12.

At the outputs of the formers 10, 11, and 12, pulses appear at the moment when signals from the outputs of the zero-organs 4, 5, and 6 arrive at their inputs, respectively. The presence of drivers in the circuit is not necessary, however, it is necessary that the control inputs of keys 7, 8 and 9 receive impulse signals.

The device works as follows.

At the command received at the moment to to the input of the Start of the source 1, on its input an exponentially falling from the constant level U ,, with

constant time voltage (t), which goes to the second inputs of the zero-organ 3, A and the signal inputs of the keys 8 and 9. The first inputs of the zero-organs 3 and 5 are energized by the voltage Ugjf, to the first inputs of the zero organs 4 and 6 is the voltage UBICE.

Let, for definiteness, Ugj (4 When conditions U ((at some instant of time t, at the output of the null organ 3, a signal is generated. Input is the Start of the source 2, the output of which is formed, starting from the time t, exponentially falling from constant level and ,, and constant time voltage (t). The key 7 is closed, and the second inputs of the zero-organs 5 and 6 are energized

ieg () When the condition U (tj) is met

Ug at some point in time t at the output of the null organ. 5, a signal is generated that arrives at the input of the imager 11, from the output of which the pulse signal is fed to the control input of the key 8, opening it, and the signal and, (tj) appears at the first input of the recorder 15. Based on relations (6), (10) and (12), the value of U, (t,)

684

proportional to voltage and ' raised to whole or fractional power.

When the condition Ug (t) is fulfilled, at some instant tj, at the output of the zero-organ 4, a signal is generated that arrives at the input of the generator 10. The pulse signal from the output of the generator 10 enters the control input of the key 7, which opens, and the second the input of the recorder 15 receives a signal (tj) proportional to the ratio of the input voltages.

When the condition U32 (t) is fulfilled, at some moment of time t, at the output of the zero-organ 6, a signal is generated that arrives at the input of the driver 12, the pulse signal from the output of which, entering the control input of the key 9, opens it, and at the third input of the recorder 15 a signal appears and (t), which is recorded by the recorder 15.

Based on relations (7), (П) and (13), it can be argued that the voltage U (t) is proportional to the product of the measured voltages, and the value of one of the factors is equal to the second measured voltage raised to the integer or fractional power .

On the falling edge of the pulse signal from the output of shaper 12, which enters the Stop inputs of sources 1 and 2, the operation of the device stops.

Claims (1)

Invention Formula The method of measuring the ratio of the two voltages on the author. St. No. 1120248, characterized in that, in order to extend the functionality by making it possible to measure the product of voltages and the square of the higher measured voltage, the second exponentially falling voltage is compared with the measured voltages and at the moments of equality of the second exponentially falling higher voltage and lower measured voltages, the values of the first exponentially falling voltage are measured. UstfU) Editor M. Kelemesh Compiled by S. Rybin Tehred M. Khodanich Proof-reader I. Erdeyi Order 4404/40 Circulation 728 Subscription VNIIPI USSR State Committee for inventions and discoveries 1 13035 ,. Moscow, Zh-35, Raushsk nab ,, 4/5 Production and printing company, Uzhgorod, st. Project, 4