SU1434405A1 - Interpolator of periodical structure pitch - Google Patents

Abstract

The invention relates to automation and computer technology and can be used in metal-cutting machines, coordinate measuring machines and other technical means equipped with periodic structure converters. The purpose of the invention is to increase the speed and reliability of the interpolator. The delivered chain is achieved by the fact that the interpolator containing the resistive phase-shifting bridge 1, the group of comparators 2 and the buffer register 3, are entered into a circular reversing moving register 4, the formers 5 and 6 of the output and rectangular signals, the signal generator 7, the driver the strobe signals 8, the first 9 and the second 10 inverters, a group of inverters 11: and the adder 12. The interpolator provides high speed and insensitivity to short noise and fluctuations of the input signals. 2 hp f-ly, 4 ill.

Description

The invention relates to automation and computational technology and can be used in metal-cutting machines, coordinate measuring machines and other technical means equipped with converters with a periodic structure.

The aim of the invention is to increase the speed and reliability of the interpolator.

FIG. 1 depicts the described interpolator in FIG. 2 — an output driver; in fig. 3 —former of unified signals in FIG. 4 - a table characterizing the logic of formation of the output: signals,

The interpolator (Fig. 1) contains a ring resistive phase-shifting bridge 1, a group of comparators 2, the number n of which is equal to the number of intervals of the half steps of the periodic structure, the buffer register 3 by n bits, the ring reversing shift register 4, the shaper 5 output signals and the driver 6 dp of corona signals, a clock generator 7, a strobe driver 8, first 9 and second 10 inverters; a group of controlled inverters 1 and an adder 12,

The output driver 5 (FIG. 2) contains the first element 13j trigger lAj first 15, second 16, third 7 elements of the comparison second 18 and third 19 elements AND, NOT,

Shaper 6 of the rectangular signals (FIG. 3) contains the first 20 and second 21 triggers, the comparison element 22, the first 23 and the second 24 AND-OR-NOT elements.

Interpol torus works as follows.

The signals from the raster transducer, the corresponding functions of sin k, cos X, -sinx and -cos x, are fed to a preamplifier (not shown) and amplified by it. Reinforced signadas arrive on the diago. kali of the ring resistive phase-rotating bridge i (fig „i), voltage corresponding proportional sin (x + o () / sin (x + flO / 5 sin (x -f 2c ) and t, d ,, where c (phase angle of the signal corresponding to the 1 / n-th fraction of the raster step.

0

five

0

five

0

five

0

five

0

five

These signals are sent to a group of comparators 2, where they are converted into square impulses (meanders) shifted from one another by an angle of /.

To control the interpolator cycle, there are a generator 7 and a strobe signal generator 8, which produces four strobe sequences C1-C4. By the first strobe buffer register 3, the state of all comparators belonging to group 5 is stored. The second gate remembers the transfer value that occurs in adder 12 due to the addition of operands B and A, the third gate inverts operand B, and the fourth analyzes the characteristics and generates control signals tlj used to control the ring reversing shift register 4 and the output signals that

In the static state, the value of all the bits of the ring reverse shift register 4 coincides with the value of the corresponding bits of the buffer register 3. In this state, the value of sum S in the second summation cycle (S A + B) corresponds to the full set of units (value, in the additional code S -1), which prohibits (Fig. 2) the issuance of signals ti. If, due to a change in the sensor state, the contents of the buffer register 3 do not match the content of the ring shift of register 4, then the condition S -1 is not met and the pulses are allowed.

The logic of forming the output signals can be traced by the table - (FIG. 4), where, using the example of the four-interpolator - (dividing the pitch into eight parts), the values of the sensor signals (operand A) and the ring shift register (operand B) are indicated. The values of operand B are presented both in direct and inverse codes. The whole field of possible values of operands can be represented as two zones. In the first zone, the values of the operands start with zeros, in the second - with ones.

The output logic can be represented by the following equation:

+1

7. Return from the first zone to the WTO

7, (Pj, ® P;) © (Al © Bl)

 l- -1

ten

When the interpolator is working, eight logical situations are possible, four of which are associated with transitions within each of the zones, and the other four - with transitions from zone to zone. The number of situations does not depend on the number of divisions of the step of the raster, which makes it possible to build interpolators along this scheme with the division of the step not only into eight, but also into 20.40 and more parts.

The situations that occur during transitions are considered in the sequence of their placement in the table.

1. Shift to increase size inside the first zone.

In this case, neither the first nor the second addition yields a transfer, and the high-order bits of the A1 and B1 operands are zero. The result of the logical operation: 25

Z (O ® 0) O (O ® O) O ® O O,

that the appearance of momentum is +1.

2. The transition inside the first zone in the direction of decreasing size.

20

15

thirty

;., one; P 0; A1 B1 0;

Z (1B0) ® (A1F B1) 1®0

that the impulse is -1.

3. Return from the second zone to the first.

R.1 1; Pi I; A1 I; AT 10; Z (1®1) ® (1®0). 0 @ 1

what causes the impulse -I.

4. The transition from the first zone to the second.

R;., 1; R; 0; A1 0; AT 11; Z (1 ® 0) O (O® 1) 1 ® 1 0,

generate a momentum +1.

5. The transition inside the second zone in the direction of increasing the size.

1: A1

 IN 1 ;

1) OFS O

-,.. one; R

Z (1 O 1) 0 (1

as a result, the momentum is +1. 6. Transition within the second zone in the direction of decreasing size.

 0; A1 RL 1;

ABOUT

R. one .

  " one

Z (1 (5 0) ® (1 ® 1) 1

-1 pulse is generated.

ruyu.

P, - 1 0; P, 0; A1 O; IN 1

I;

7. (О Ф 0) @ (О @ 1) 0 @ 1 1,

impulse comes -.

8. Transition from the second zone to the first (on the next interval of the raster step).

Pi-, 0; Pi 1; Al 1; Bl 0; . (O ® O @ (1 © 0) 1 ® 1 O,

five

0

five

0

five

5 comes the impulse -i-l.

The -t-l pulses control the movement of information in the ring shift register, shifting it one step in the appropriate direction. If the mismatch is equal to one step, then the equilibrium (S -1) is restored and further displacement is stopped. If a mismatch occurs by more than one step, several +1 (or -1) pulses are successively executed until equilibrium is reached (+1 signals for an annular reverse shift register provide feedback 0).

The bit of information pushed out of the shift register 4 is inverted by inverters 9 and 10, which, when moving, changes the information sign (transition from zone to zone).

Depending on the structure of the readout parts of information converters, the output signals can be used both in the form of t1 signals and in the form of unified signals (meanders) having a sine or cosine phase and exceeding the frequency of the input signal by n / 2 times. The formation of such signals is performed on two triggers 20 and 21 (Fig. 3), the comparison element 22 and the AND-OR-HE 23 and 24 two-elements.

The interpolator provides high 0 speed (up to 1 MHz by signals of ± 1) and is insensitive to short interferences and fluctuations of input signals. If, due to these reasons, the sensor signals are thrown, 5 then it is eliminated within several cycles of the interpolator, and the frequency of the pulses to the recording part is determined by the generator frequency and does not depend on the value

casting This allows you to reliably record even jump-like changes in the input quantity.

Claims (1)

Invention Formula 1, Interpolator of a periodic structure pitch containing a ring resistive phase mapping MocTs group of comparators, a buffer register, outputs of a ring resistive phase rotating bridge connected to the inputs of a comparators group whose outputs are connected to information inputs of the buffer register, characterized in that, for the purpose of increasing speed and reliability of the interpolator; a ring reversible shift register, output driver, square wave formatter, clocking generator , the strobe pulse former 5, the first and second inverters, an adder and a group of controlled inverters, the output of the clock generator connected to the control input of the gate strobe pulse generator, the first output of which is connected to the control input of the buffer register, the second output to the first control the output shaper input, the third output to the control input of the group of controlled inverters, and the fourth output to the control input of the output shaper j whose information inputs are connected The first and second information inputs correspond respectively to the first outputs of the ring reverse shift register and the buffer register, and the third information input to the transfer output of the adder, the first and second control outputs of the output driver are respectively connected to the first and second controllers. to the input inputs of the square wave imager and ring resis. tive shift register, the outputs of which are connected to the inputs of inverters of the group, the outputs of which are connected to the inputs of the first group of the adder, the inputs of the second group of which 0 five five 0 five 0 podkklche The first and last outputs of the ring reversible shift register are connected to the inputs of the buffer register and cTpaj, respectively, to the inputs of the first and second inverters connected by the outputs, respectively, to the third and fourth control inputs of the ring reversing shift register, 2, An interpolator of clause Ij of tl and - due to the fact that the output signal receiver contains the first, second and third AND-NOT elements, trigger, first, second and third comparison elements, the first and second control inputs of the imager, respectively connected to the trigger sync and the first inputs of the second and third elements AND-NOT, the information inputs of the imaging group are connected to the inputs of the first AND-NE element .; the output of which is connected to the second inputs of the second and third elements NAND, the third inputs of which are connected to the output of the third comparison element, the inputs connected to the outputs of the first and second comparison elements j the inputs of the second comparison element are respectively the first and second information -1 and shaper inputs,. The third information input of the driver is connected to the D input of the trigger and the first input of the first comparison element, the second input of which is connected to the output of the trigger. 3, the Interpolator according to claim 1, characterized in that the square wave former comprises the first and second triggers, the comparison element 5, the first and second AND-OR-NOT elements, the first and second control inputs of the transformer are connected respectively to the first and to the second inputs of the elements AND OR NOT, the outputs of which are connected respectively to the synchronous inputs of the first and second triggers, the D inputs of which "Connected to their own inverse outputs, and direct outputs connected to the first and second inputs of the reference element." , the output of which is connected to the third and fourth inputs of the first and second elements AND-OR-NOT, C & i / f.J FagL