SU1404990A1 - Digital magnetic induction meter - Google Patents

Description

(21) 4091291 / 24-21

(22) 07.07.S6

(46) 06.23.88 / Bksh. № 23 (72) A.N.Foyda, O.T.Chigirin, Yu.T.Chigirin and I.P. Smirnov

(53) 621.317.44 (088.8)

(56) USSR Author's Certificate .№ 1075303, cl. G 01 R 33/02, 1982.

,. The author's certificate of the USSR R 536448, class, G 01 R 33/06, 1974.

(54) DIGITAL MAGNETIC INDUCTION METER

(57) The invention can be used for precision measurement.

in a wide range of constant magnetic fields. The digital magnetic induction meter contains a Hall sensor .1, switch 2, power supply 3, synchronous detector 4, voltage converter 5 - code, recording unit 6, unit. 7 control, voltage converter 8 - number of pulses, reversible counter 9, generator 10 clock pulses, counter 11 pulses, decoder 12, triggers 13-15, And 16-20 elements. Digital meter improved measurement accuracy. 1 hp f-ly, 2 ill.

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The search refers to magnetic measurements and can be used for precision measurements over a wide range of constant magnetic fields.

The purpose of the invention is to increase the measurement accuracy.

FIG. 1 shows a functional block diagram of the device; in fig. 2 - timing charts of the control unit.

The diagrams a - d show the signals at the corresponding outputs of the counter, while the diagrams e - l show the signals, respectively, on the third, second, sixth, first, fifth and fourth outputs of the decoder.

The digital magnetic induction meter contains a Hall sensor 1, the current input and the signal output of which are connected via switch 1C 2 to the output of power supply 3 and the input of synchronous detector 4, respectively. The control input of detector 4 is connected to the output of the power supply output to the converter input. 5 voltage is a code, the output of which is connected to the input of block 6 of registration.

The control input of the switch 2 is connected to the first output of the control unit 7, the second output of which is connected to the first control input of the converter 5, the third to the control input of the recording unit 6, the fourth and fifth, respectively, to the third and fourth the control inputs of the converter 5, the first input with the clock output of the converter 5, the second input with the output of the counting pulses of the converter 5, the third with the output of the converter 5.

Voltage converter 5 - ko contains voltage converter 8 - the number of pulses, the output of which is connected to the counting input of the reversible counter 9 and the counting pulse output of the converter 5. The input of the converter 8 is the input of the converter 5, the output of which is connected to the input of the counter 9, clock output with the clock output of the converter 8, the start of which is connected to the first control input of the converter 5, the second and third control inputs of which are connected to the reset inputs and directed) and counter count 9, respectively.

five

0 5

50

five

five

The control unit contains a clock pulse generator 10, the output of which is connected via a pulse counter 1 1 to the decoder input 12. The first, second, third and fourth outputs of the decoder 12 are connected to the first, second, fourth and third outputs of the control unit 7, respectively. The third output of the decoder 12 is connected to the reset inputs of the first 13, second 14 and third 15 flip-flops, the fifth with the first inputs of the first 16, second 17 and third 18 And elements, the sixth with the first input of the fourth 19 And elements, the second input of which is connected to the first input unit 7 and the second input of the third element And 18. The outputs of the elements 17, 18 and 20 are connected to the installation inputs, respectively, of the flip-flops 13 - 15, and the output of the element 16 and 16 is connected to the counting input of the trigger 13, the output of which is connected to the fifth control unit 7 output. The second and third inputs of the element 16 are connected, respectively, to the outputs of the flip-flops 14 and 15. The second and third inputs of the element 17 are connected, respectively, to the third and through the inverter 20 to the fourth inputs of the control unit 7.

The meter works as follows.

In the first measurement cycle, the output signal of Hall sensor 1, U, (e), where e is the Hall electromotive force after conversion in the synchronous detector 4, is fed to the converter 8, the voltage is the number of pulses. The result of the conversion in the form of pulses is fed to a reversible counter 9, counting in the forward direction:

N, K, Kje, tUH, | ,

where K ,, K is the conversion factor, respectively, of the synchronous detector and converter 8;

UNE is the voltage of non-equipotentiality.

In the first cycle, the reversible counter 9 always counts in the right direction: since in the first cycle the trigger 13 is brought to the zero state by the signal received from the output of the element 17, to the first input of which a control signal is received (Fig. ) with the fifth output of the decoder 12.

At the end of the first measurement cycle, the control unit 7 produces {mutation of the switch 2. In the second cycle from the sensor 1 of the Hall to the converter 8, the voltage is the number of pulses the voltage enters both ex ± and „e. Depending on the ratio of the levels e, and во in the second cycle, the results of measurements of two cycles are summed or subtracted.

When e (", 1, in the reversible counter 9, the results of two cycles are summed, if inequality. 1ce | - subtraction of measurement results. If tUH,, with a positive magnetic induction direction (+ B), triggers 14 and 15 will operate, with a negative direction ( -B) magnetic induction trigger triggers 20, the control unit, the first 14 and 15 will not work. Element AND 16 of the output of which is connected with the control

decrypts the state of the blocks 14 and the 15th input of the switch, the second one and in this mode of operation does not change with the first control input of the flip-flop 13. Therefore, the voltage driver is a code, the third 25 with the control input of the block is register-reversing measuring clock reversal. counter 9 works harder

N5.N, + N;; K, Ki | e,:;: UH, l + KiKje, ± UH, | 2K) To e y.

At II g: I CC, the operation of the device depends on the state of the output levels, of course, with the third and fourth controls, characterized in that, in order to improve the measurement accuracy, the fourth and fifth outputs of the control unit are connected, corresponding to the signals of the Hall sensor 1 in both measurement cycles, determined by the direction of magnetic induction. With a negative magnetic induction direction. The output level of the sensor of the 1Cold during the second measurement cycle will be greater than during the first cycle, and with a positive magnetic field induction direction, the output signal of the sensor will

1 Hall in the first clock will be a large voltage converter - the number

more than the second measure.

In the positive direction of the magnetic induction in the second cycle, the reversible counter 9 operates to subtract

, -N, K, K 1i ,, t: el-K, Kj lU ,, t е, | 2K, K, e ,.

With a negative direction of magnetic induction in the second cycle, the reversible counter changes the direction of counting and begins to work on addition. As a result, counter 9 will record the number of pulses proportional to the EMF of the Hall:

N, K, KjUH, -eJ; , KjU ,, - t-eJ; Ng.n ,,.

The accuracy of the measurement is due to the fact that at the time of subtraction

impulses, the output of which is connected to the counting input of the reversible counter and the output of the counting impulses of the generator voltage - code, input

whose input is the input of the transducer; the voltage is the number of pulses, and the output is the output of a reversible counter; the output of the clock pulses is the output of the clock pulses.

g body voltage - the number of pulses, the start input of which is connected to the first control input; the voltage transducer is a code; the second and third control inputs of which are connected

55 with the reset and direction inputs of the reversible counter, respectively, with the output of the synchronous detector connected to the input of the voltage-to-code transducer.

4990

in the reversible counter 9, the control unit is blocked, which generates control signals only after the transient process in the counter 9.

Claims (2)

Invention Formula 1 Digital magnetic meter induction, containing a Hall sensor, current input and signal output of which are connected via a switch, respectively, to the source output power supply and the input of the synchronous detector, the control input of which is connected to the output of the power source, the voltage transducer is the code whose output is connected to the input of the unit, with the third and fourth control, characterized in that, in order to improve the measurement accuracy, the fourth and the fifth outputs of the control unit. are connected, respectively The main inputs of the voltage converter are the code, the first input is with the clock output of the voltage converter — the code whose output pulses are connected to the second input of the control unit, the third input of which is connected to the output of the voltage converter — the code contains pulses, the output of which is connected to the counting input of the reversible counter and the output of the counting pulses of the voltage converter - code, input which is the input of the voltage converter is the number of pulses, and the output is the output of the reversible counter, the output of clock pulses by the output of the clock pulses of the voltage converter is the number of pulses, the start input of which is connected to the first control input of the voltage converter - the second and third control inputs of which are connected with the reset inputs and the counting direction of the reversible counter, respectively, with the output of the synchronous detector connected to the input of the voltage converter —a code. 2. The meter according to claim 1, characterized in that the control unit comprises a clock pulse generator, the output of which is connected via a pulse counter to the input of the decoder, the first output of which is connected to the first output of the control unit, the second to the second output of the control unit the fourth output of the control unit and the reset inputs of the first, second and third triggers, the fourth with the third output of the control unit, the fifth with the first inputs of the first, second and third elements And, the sixth with the first input of the fourth element And, v the input of which is connected to the port P P 0Lf8.2 49906 the input of the control unit and the second input of the third element I, and the outputs of the second, third and fourth elements I are connected to the installation inputs, respectively, of the first, second and third triggers, the output of the first element I is connected to the counting input of the first trigger, the output of which is connected to n the first output of the control unit, the second and third inputs of the first element I are connected to the corresponding outputs of the second and third triggers, and the second and third inputs of the second element I are connected, respectively,: to the third and through an inverter with the second inputs of the control unit. ten 15 and