SU1219991A1 - Digital meter of constant magnetic induction - Google Patents

Abstract

The invention relates to the field of magnetic measurements and can be used for precision measurements in a wide range of constant magnetic fields. The purpose of the invention is to increase the measurement accuracy, which is achieved due to the fact that regardless of the ratio of the useful and residual Hall sensor signals and the levels of the Hall sensor output signals in both clock cycles, the residual signal (inequipotency) of the Hall sensor is excluded from the measurement results. The meter consists of a Hall sensor 1, made in the form of a primary magnetic induction converter, an automatic switch 2, a power source 3, a voltage code-4 converter, for example, an ADC, a reversing counter 5, a phase-sensitive element 6, which is a zero-organ. the meter enters trigger 7 with a counting input, digital indicator 8, control unit 9, decoder 10, decoder additional code 11,. block 12 is mod 2, triggers 13, 18 and 19, logic gates And 14-17 and overload indicator 20. Block 9 synchronizes the operation of the entire device and issues commands to the appropriate blocks at certain points in time. 3 il. (L | S with so; o

Description

The invention relates to magnetic measurements and can be used for precision measurements in a wide range of constant magnetic fields.

The aim of the invention is to improve the measurement accuracy due to the fact that regardless of the ratio of the useful and residual signals of the Hall sensor and the levels of the output signals of the Hall sensor in both cycles, the residual signal (non-equipotentiality voltage) of the Hall sensor is excluded from the measurement result.

FIG. 1 shows the output signals of the Hall sensor; in fig. 2 is a block diagram of the proposed digital constant magnetic induction meter; Fig. 3 shows the timing of the operation of the proposed digital constant magnetic induction meter.

A digital constant magnetic induction meter (Fig. 2) consists of a Hall sensor 1, made in the form of a primary magnetic induction converter, an automatic switch 2, a power source 3, a voltage converter 4, a code that is an analog-digital converter, and a reversible counter 5, a phase-sensitive element 6, which is a zero-body trigger 7 with a counting input, a digital indicator 8, a control unit 9, a decoder 10, an additional code decoder 11, an addition block 12 modulo 2, a trigger 13, elements And 14-1 additional trigger 18, trigger 9 overload and indicator 20 overload. In addition, in FIG. 2 shows the inputs-outputs 21-35 of the device and the corresponding pulses in FIG. 3 o

The control unit 9 serves to synchronize the operation of the entire device and issues command signals to the corresponding units of the device at certain points in time. The control unit 9 may consist of a clock generator, a counter and a decoder, the decoder analyzing the state of the counter to which the clock signals are received, and at certain points in time issues command signals

Hall sensor 1 is connected to the first input of an automatic switch.

0 5

2o The second input of the automatic switch 2 is connected to the output of trigger 7 with the counting input, the third input of the automatic switch 2 is connected to the output of the power supply source 3 and the first input of the phase-sensitive element 6. The output of the automatic switch 2 is connected to the first input of the voltage converter 4 - code and the second input phase-sensitive element 6o Second input of the converter 4 voltage - the code is connected to the counting input of the trigger 7 with the counting input, the first input of the reversing counter 5, the first input of the decoder 10 , the first input of the additional code decoder P, the first input of the digital indicator 8, the first inputs of the AND elements 14-17, the first inputs of the flip-flops 13 and 18, the first input of the overload trigger 19 and the output of the control unit 9. The output of the voltage converter 4 is a code connected to the second input of the reversible counter 5. The third input of the reversible counter 5 is connected to the output of the trigger 18. The first output of the reversing counter 5 is connected to the second inputs of the decoder 10 and the decoder

11additional code, the second output of the reversible counter 5 through the element And 17 is connected to a single input trigger 19 overload, the output of which is connected to the indicator 20 overload. The output of the phase-sensitive element 6 is connected to the first input of the unit.

12 Compliant mod 2 and the second input element And 14. The second input trigger

13 is connected to the output of the element 14, the first output of the trigger 13 is connected to the second input of the addition unit 12 mod 2, the output of which through the element

And 16 is connected to the second input of the trigger 18. The second input of the element 15 is connected to the second output of the trigger I3, and the output to the third inputs of the decoder 10 and the decoder 11 of the additional code.

The device works as follows.

The operation cycle of the device takes place in two measurement cycles. At the beginning of the first cycle from the first pair of opposite electrodes of the Hall sensor 1 through the automatic switch 2 to the converter 4 voltage - the code receives the voltage U t +, where UKJ is the voltage of the non-equipotentiality of the Hall sensor; EMF Hall. The result of encoding N is stored in the reversible counter 5; N (E + +) K, where K the voltage transformer coefficient is a code. The end of the coding process is fixed by the control unit 9, which switches the automatic switch 2 through the trigger 7 with the counting input. This corresponds to the beginning of the second measurement stroke. At the second clock the output voltage of the Hall sensor 1 is removed from the other pair of opposite electrodes and is equal to and E. -. B - depending on the ratio of P levels; and U in the second cycle is the summation or subtraction of the measurement results of two cycles. During both measurement cycles, the reference signal of the phase-sensitive element 6 C, „and the total output signal of the Hall sensor 1 U (+11.9 are in phase with P inst, when these signals are in phase in one of the measuring cycles and out of phase in another cycle. This is due to the fact that the reference signal coincides in phase with the Hall EMF FX during both measurement cycles. Information about the phase change of the output signal of the Hall sensor during the second measurement cycle is extracted using phase sensitive element 6, element 14, trigger 13, addition unit 12 mod 2. Depending on the state of In addition, mod 12, the trigger 18 is set to a certain state in the second cycle and outputs a command signal to the reversible counter 5 (determines the counting direction). In the first cycle, the trigger 1.8 always issues such a signal that the reversible counter 5 works only on addition

n

When the reversible counter 5 in the second cycle is used to sum the results of measurements of two cycles, for fx -U., They are subtracted. In addition to determining the type of operation, in the reversible counter in the second cycle, the code type (direct or additional) is determined, which is stored after the end of the second cycle in the reversing counter 5. A sign that determines the type of code in the counter counter 5 (direct or additional ) after the second cycle, is the field p 5 y 20 25 DL o,

the output signal of the phase-sensitive element 6 in the first measurement cycle. If the signal of the phase-sensitive element 6 is positive, then there is a direct code in the reversible counter 5, if the signal of the phase-sensitive element 6 is negative, there is an additional code in the reversible counter. In the first case, the element 15 connects the decoder 10 of the direct code, in the second case the decoder 11 of the additional code. The type of operation and the type of code are determined as follows.

x ne ° measurement of the output signal of the phase-sensitive element 6 is in phase with the reference signal. The inputs of the addition unit 12 mod 2 in the second cycle receive signals of the same type from the phase-sensitive element bis trigger 13, in which the polarity of the output signal of the phase-sensitive element 6 is memorized in the first measurement cycle. The output of block 12 of the mod 2 mod is not passed through the AND 16 element in the second clock and the state of the trigger 18 does not change; in the second clock, the reversible counter 5 works on addition:

N К (, + and) + К (Г, -и „,) 2КЕн

If the output signal of the phase-sensitive element 6 is positive, element 14 is activated and changes the state of trigger 13. In this case, element 15, in the presence of an enabling signal, triggers 13 at its second input and generates an enable signal to the decoder 10, which is used to match direct code reversing counter 5.

 Uh ,,

R. + and.

Uo

 fx and., - ix - g and „e 2.

- The output signal of the phase-sensitive element 6 is in phase with the reference signal UQ in the first cycle and opposite to it in the second cycle. The inputs of the addition unit 12 mod 2 in the second cycle receive signals of a different type: from the phase element 6 - negative and from the trigger 13 - positive. The output signal of the addition unit 12 mod 2 at the same time, the Arodet through element 16 and change the state of the trigger 18. Therefore, in the second

tact reversible counter 5 works on the subtraction:

N; K (E, + U,) - K (U ,,,.

If the output signal of the phase-sensitive element 6 is positive, element 14 is triggered in the first stroke and changes the state of flip-flop 13. In this case, element 15, in the presence of an enable signal, from flip-flop 13 at its second input triggers the enable signal to the decoder 10, with which it reads Direct code of the counter-version counter 5.

J, U ,,, and, F, - and ,,, and x + + and,, The output signal of the phase-sensitive element 6 is antiphased with the reference signal in the first measurement cycle and is in phase with it in the second cycle To the inputs of the addition unit 12 mod 2 In the second cycle, different types of signals are received: from the phase-sensitive element 6, positive, and from trigger 13, negative. The input signal of addition unit 12 mod 2 will then pass through AND 16 and change the state of flip-flop 18. Therefore, in the second clock cycle, the reversible counter 5 works for subtraction:

N; K (UH, -t,) - K (U ", + J,)

ki, -kg, -ki, -kg, -2KR ,.

With a negative output signal of the phase-sensitive element 6, the first cycle And 14 does not work and therefore does not change the state of the trigger 13, the unit input of which does not receive a control signal. In this case, the element 15 when there is a inhibitory potential at its second input from the trigger 13 outputs the enable potential to the decoder 11 of the additional code, with the help of which the additional code of the reversible counter 5 is read. In the presence of an overload in two measurement cycles, trigger 19 overload on the signal is triggered element 17, the overload check is performed during the first cycles of the first and second measurement cycles.

Claims (1)

Invention Formula Digital Meter magnetic induction sensor containing successively connected hol 5 10 15 20 25 thirty five 0 five 0 five la, automatic switch, voltage converter - code, reverse meter, decoder and digital indicator, the second input of which is connected to the second input of the decoder and to the first trigger input, the output of which is connected to the second input of the reversible counter, the third input of which is connected to the first to the input element I, to the first input of the overload trigger, to the second input of the voltage converter - the code and to the input of the trigger with the counting input, the output of which is connected to the second input of the automatic switch, the third input which is connected to the power source and to the first input of the phase-sensitive element, the second input of which is connected to the output of the automatic switch, and the second output of the reversible counter is connected to the second input of the element AND whose output is connected to the second input of the overload trigger, its output connected to the overload indicator, different by the fact that, in order to improve the accuracy, the modulo 2 modulo addition block is introduced into it: three additional elements AND, the second trigger, the additional code decoder and the control block, the output of which is connected to the first inputs of the additional code decoder, additional elements I, to the second input of the digital indicator, to the first input of the second trigger and to the input of the trigger with a counting input, the output of the phase-sensitive element is connected to the second input of the first additional element I and through the addition unit mod 2 - with the second input of the second additional element And, the output of which is connected to the second input of the second trigger, the output of the first additional element And is connected to the second input of the second trigger, the first The second output of which is connected to the second input of the addition unit mod 2, the second output of the second trigger is connected to the second input of the third additional element I, the output of which is connected to the control inputs of the decoder and the decoder of the additional code, the second input of the latter is connected to the first input of the decoder, and the output - to the third input of the digital indicator. Compiled by V. Kolachevska Editor P, Tsitsika Tehred V. Kadar Proofreader E. Sirohman Order 1319/53 Circulation 728 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d, 4/5 Branch PPP Patent, Uzhgorod, st. Project, 4