SU1349006A1 - A.c.balance-modulated signal-to-code converter - Google Patents

Abstract

The invention relates to automation and computer technology and can be used to connect analog UmSinjut - (i-l) j t phases J o {vk sources of information with digital computing devices. The invention extends the range of application of the converter. This is achieved by converting a converter containing adders 1.2, a code conversion unit 3 into cosine and sine codes, analog-digital multipliers 4.5, a subtracting amplifier 6, a low-pass filter 7, a driver 8 error pulses, a reversible counter 9 pulses , analog digital multipliers 10, 11, analog multipliers 12,13, adders 14, 5 are introduced. Il. tJm-jcos () i / m) sLn () i (L Ufa sinfut) U jfySiafv-A): CD O5 i / mCCfSfwt- A) m jSin (utt4) cos (ut -fA} IJmjSin (ufti-a)

Description

The invention relates to automation and computing and can be used to connect analog information sources with digital computing devices.

The aim of the invention is to expand the field of application of the converter by providing the possibility of converting the signals of various sensors.

The drawing shows a functional diagram of the device.

The converter contains adders 1.2, block 3 converts code to sine and cosine codes, analog-digital multipliers 4.5, subtracting amplifier 6, low-pass filter 7, driver 8 mismatch pulses, reversing counter 9 pulses, analog-digital multipliers 10, 11, analog multipliers 12,13, adders 14,15.

Converter balanced-modulated signals of alternating current to the code works as follows.

When used as a phase angle sensor with K outputs, voltages are applied to the inputs of the adders 1.2

21

 sin | ot +

.f- (i-,),

where i 1,2, ..., K;

i - number of the adder's input

The voltages generated by analog multipliers 12,13 are fed to the inn. Since the transfer coefficients are inverse and direct inputs are deducted

Dov adder 1 selected in the corresponding amplifier 6, so that at its output

depending on sinous sin 2ir / K (i-l) dependence, then at its output

voltage is generated

2 K and „.

in ("i, - A) I

Mr. K ,,

and jsi +)

voltage

and

2 K and „.

in ("i, - A) I

and jsi

hn 5

g

cos (ut + oL} J and. sin (0t + oL + 0 cos (ot -t- A) - U | cos (ut + oi)

sin: - :-( i - 1). L

 sin (cot + A) Nc,

V

where RU is the amplification factor of the amplifying amplifier 6.

Accordingly, at the output of the second adder 2, we have:

and

2sin (ut +06)} U sinfcot -n oi- +

g (-)

L

/. Ii /. V

(l - 1),

since the transmission coefficients of its inputs are selected in accordance with the cosine dependence. On

Noah cosr ;-( i - 1) to

The output of block 3 forms the codes cos A and sin A from code A. These codes are multiplied by the reference voltages U coscot and U sincot, so that at the outputs of the analog-digital multipliers

4,5,10,11, we have the voltage U sincot & cos A, t-sin A, U cosot f Cos A, U sincOt-sin A, respectively. The first two voltages are summed by adder 14, and at its output a voltage (tot + A) U is formed.

+ U coscot sin A.

The last two voltages are summed by adder 15 (with the fourth voltage in reverse polarity) and at its output a voltage is formed

(c3t + A) U coscJt-cos A - -U sinut-sin A.

The voltages generated by the adders 1.14 are multiplied by the analog multiplier 12, and at its output we have the voltage

+ about

) sin (ut + A) (cjt +

25 The voltages generated by adders 2.15 are multiplied by an analog multiplier 13, and at its output we have the voltage

and

2 K

Ksin (cot + o6) Cos (cJt + A)

TO

  sin (ut + oi) (ot + a).

voltage is generated

A) i

Mr. K ,,

and jsi +)

 0 cos (ot -t- A) - U | cos (ut + oi)

 sin (cot + A) Nc,

45

V

where RU is the gain factor of the subtractive amplifier 6.

50

The low pass filter 7 suppresses possible high frequency components in the signal of the subtracting amplifier 6. The misalignment pulse generator 8 processes the mismatch signal and K / 2 Ru-sin (c, -A) and generates a sequence of pulses integrated by a reversing counter 9. These pulses are fed to the summing or subtracting inputs of the reversing counter 9 and, depending on the sign of the error signal K / 2-E sin (oL - A).

The code A of the angular position ai from the output of the reversible counter 9 is fed to the input of the block 3. The code A in the reversible counter 9 is changed to eliminate the mismatch between the angle o and the code A.

When used as an angle sensor for an amplitude K-phase sensor (for example, an induction type), voltages are applied to the inputs of the adders 1.2

U sinut

sin Ы +

(i- i).

TO

The output of the adder voltage

and sincb about u sincot

N) m

g / - X sinL + (i - l) jsin (i - l).

Accordingly, at the output of adder 2, we have:

 SL) t sin oi

 ut

1 formed

si

2t,.

- (X

-}

Ii ii /, cos -.- (1 - 1 j

and sin cot-, rcos oi.

2

TO

 ; ySln Oi COS

sin A and and

n

A

sin CO t

Ha analog inputs of analog-digital multipliers 4,5,10,11, instead of voltages U cnsQt and U sinQt, signals 0,1,1,0 are supplied, so that at the outputs of adders 14,15 we have voltages sin A and cos A, respectively. Thus, the sin A and cos A codes from the output of the conversion unit 3 are not subject to conversion (phase shift). As a result, the outputs of the multipliers 12, 13 have the voltage K

respectively. The subtractive amplifier 6 generates a mismatch signal:

t / u sincot jR sin (oi. - A). Of the latter

the low-frequency component K / 2 (v - A) is extracted by the lowpass filter 7.

The converter allows to interface not only with K-phase angle sensors in amplitude mode, but also with phase shifters that form K-balance modulated AC signals

Ui

U sinLt -f M + | - (i - 1) j,

where k 2.

In mating mode with amplitude K-phase angle sensors instead of quad

five

five

0

five

0

five

0

five

field voltages with t and

and sin cot to analog inputs

m

multipliers 4,5,10,11 are given signals 0,1,1,0 respectively.

Claims (1)

Invention Formula Converter of balanced-modulated signals of alternating current into a code containing a subtractive amplifier, first and second adders with transmission coefficients for the inputs, respectively, sin 2; r / K (i - 1) and cos 2 ir / K (i - i), where i 1,2, ..., K, i is the number of the input of the adder, K is the number of inputs of the converter, whose inputs are respectively combined and are the inputs of the converter, the code conversion unit into cosine and sine codes, the first and the second group of outputs of which are connected respectively to the first groups of inputs of the first and second analog-digital multipliers, and the inputs are connected to the corresponding outputs of the reversing pulse counter and are the transducer outputs, the summing and subtracting inputs of the reversing pulse counter are connected to The corresponding misalignment pulse driver inputs, characterized in that, in order to expand the field of application by allowing the conversion of signals from various sensors, the third and fourth analog-digital multipliers, the third and fourth adders, the first and second analog multipliers, filter are introduced into it low frequencies, the input of which is connected to the output of the subtracting amplifier, and the output to the input of the misalignment pulse former, the first groups of inputs of the third and fourth analogue-center the frame multipliers are connected respectively to the first and second groups of outputs of the code conversion unit to cosine and sine codes, the second input of the third analog-digital multiplier is combined with the second input of the second analog-digital multiplier and is the first reference voltage bus, the second input of the first analog-digital the multiplier is combined with the second input of the fourth analog-digital multiplier and is the second reference voltage bus, the outputs of the first and second analog-digital S13A9006® The multipliers are connected respectively to the input of the second analog multiplier - with the first and second inputs of the third liter, the second inputs of the first and second adders, the output of which are connected to analog multipliers, are connected to the first input of the first analogue. Accordingly, the outputs of the third and even second adders, and the outputs of the first true analog-digital multipliers and the second analog multipliers are connected, respectively, with the first one, respectively, with the first and second inputs of the fourth summation The third inputs of the subtractive force, the output of which is connected to, Q, QT.