RU1836661C - Position sensor pulse shaper - Google Patents

Abstract

The invention relates to the field of automated systems. The purpose of the invention is to increase noise immunity and reliability. The goal is achieved by the fact that the driver containing D-triggers, clock, logic, introduced elements OR NOT, two differential receivers with hysteresis and D-triggers, D-inputs of which are designed to connect to a voltage source, inverse the inputs of the D-flip-flops are connected to AND-NOT elements whose outputs are connected to the outputs of the driver, the inputs of the differential receivers are connected to the inputs of the driver, and the outputs are connected to the D-inputs of D-triggers, the C-inputs of which are connected to the outputs of the clock generator pulses and the first inputs of OR-NOT elements, the output of the first OR-NOT element is connected to the fifth and sixth D-flip-flops, the output of the third OR-NOT element is connected to the C-input of the sixth D-flip-flop and the R-input of the fifth D-flip-flop , the output of the first D-trigger is connected through an exclusive OR element to the second inputs of the first and third elements AND-NOT and through the third element exclusive OR is connected to the second inputs of the second and fourth elements NAND, the direct output of the second D-trigger through the first element exclusive OR connected to the second inputs of the first second OR- NO element, a direct output of the fourth D-flip-flop through the exclusive-OR connected to the second inputs of OR-NO elements, and the output of the third D-flip-flop is connected to the second inputs of the third and fourth XOR elements. 4 ill. (L C 00

Description

The invention relates to the field of automated systems and may find application in the following electric drives, as well as in electric drives based on synchronous and asynchronous electric motors with pulse

sensors for obtaining travel information in order to form a sinusoidal law of electric drive control in feed drives of metal-cutting machines and other industrial mechanisms.

Known shaper containing sequentially connected 1 and 2, 3 and 4 D-flip-flops, D-inputs of the first and third triggers are connected to the first and second outputs of the position sensor, dynamic C-inputs of all triggers are connected to the output of the clock generator, and their direct outputs connected to a logic block consisting of the first and second EXCLUSIVE OR elements and four keys.

In FIG. Figure 1 shows the most typical case in practice of the occurrence of interference (short-term change of signals from 1 to 0) in one of the channels of the position sensor (input 2), which leads to spurious operation of the driver. The latter leads to a decrease in the reliability and accuracy of devices using such a shaper.

Of the known solutions, the closest in technical essence and accepted for the prototype is a shaper, comprising 1 and 2 connected in series, 3 and 4 D-triggers connected in series, D-inputs of 1 and 3 triggers through the first 27 and second 28 elements time delay are connected to I, 1 and I.2 outputs of the position sensor which through inverters 35, 36, elements EXCLUSIVE OR 29, 30 and elements AND 31, 32 are connected to the C-inputs 1, and 3 triggers, the second inputs of elements And 31, 32 and C-inputs of triggers 2, 4 are connected to the output of the clock generator 13, direct you The trigger paths 1, 2, 3, 4 and the inverse outputs 1 and 3 of the triggers are connected to the inputs of the EXCLUSIVE OR elements 15, 16, 17, 18, the outputs of which are connected to the inputs of the AND elements 33,34, the outputs of the latter are the outputs of the driver.

This shaper is quite simple in technical solution, but it has insufficient noise immunity. The driver circuit protects against interference occurring separately in time in the forward or inverse signal of the rotor position sensor (inverters 35, 36 are functionally part of the position sensor, see the technical description for the commercially available rotor position sensors of the type TsDF-9 GLTSI.648141.006 TO ) As experience with this type of sensors at low feed speeds in metal cutting machines has shown, with an increase in the load on the mechanism, chatter (short-term switching of the rotor position sensor photodiodes) along the edges of the track information pulses increases, which causes a synchronous change in information at the forward and inverse outputs of the Sensor ( see, for example, Fig. 4). At the same time, elements 29.30 EXCLUSIVE OR do not block the recording of false information in the trigger, which

0

5

0

5

0

5

0

5

0

5

leads to malfunction of the shaper, i.e. loss of directional information, which reduces the reliability and noise immunity of the devices in which it is used.

The aim of the invention is to increase the noise immunity and reliability of the driver.

The driver circuit is shown in FIG. 2; FIG. 3 illustrates its operation; FIG. 2 and 3, the following notation is adopted.

1, 2, 3,4, 5, 6-O-triggers, 7, 8-differential receivers, 9, 10. 11, 12 - OR-NOT elements, 13 - clock generator, 14 - logic node, 15, 16 , 17, 18 - elements EXCLUSIVE OR, 19,20,21, 22 - elements NAND, 23 - inverter, - elements, 26-inverter.

Vh. 1, Vh.1, Vkh.2, Vkh, 2 - direct and inverse inputs of the driver; Out 1, Exit 4 - outputs of doubling Forward and Back former; Out 2, Exit 3 - quadruple outputs Forward and Back shaper, U-voltage; t time; a-output of the clock; 61.62 - outputs of differential receivers; B1 ... B4 direct outputs of D-flip-flops; n ... u - outputs of elements EXCLUSIVE. D1 ... D4 - outputs of elements OR NOT; BS, BS- inverse outputs of D-flip-flops.

Shaper works as follows.

In the initial state when the position sensor is stationary, regardless of the state of its outputs at the Output. 1, 2, 3, 4 shaper signals of a single level.

During the operation of the electric drive, the position sensor connected kinematically to the motor shaft or the axis of the control object comes into rotation and its outputs show alternating signals of a single and zero level with a frequency proportional to the speed of rotation of the motor shaft, which are received at Bx1. Input 1, Input 2, and Input 2 of the driver, and the signals Input 1 and Input 2 are shifted relative to each other by 90 degrees. With the direction of rotation Forward, the signal In1 ahead of the signal In2.2, with the direction of rotation Back the signal In2 ahead of the signal In.1. In the absence of interference in the communication line and the absence of bounce of the edges of the sensor pulses at the outputs of the differential receivers 7 and 8, the information of inverse Bx1 and Bx.2 is repeated, respectively. At the time moment t, when the next signal changes from 1 to O by Vx.1, the D-flip-flop 1 is set by the leading edge of the clock pulse at its direct output to 1, D-flip-flops 2,3, 4 are installed at their direct inputs to this time in O. The frequency of the clock pulses is selected from the condition Ti3 fnep, where Tper is the switching time of the D-flip-flops 1-4. With this in mind, at the direct output of the D-flip-flop 2, the signal of the unit level appears with a shift Ar Tm + Tm. At the same time, at the output of element 15, a single pulse is generated at the time of switching D-flip-flops 1, 2 of duration A g, and at the output of element 9, a zero pulse of duration T13 / 2 along the leading edge of the clock pulse to exclude race of fronts, which sets the D-trigger 5 to the zero state by the inverse output and returns to the initial single state by the inverse output of the D-flip-flop b, preparing it for the example of the first pulse when the signal Vx.2 changes. The inverse output of the D-flip-flop 5 blocks with a zero signal the further passage of information through the element 10 until the next pulse is generated at input 2, which sets the D-flip-flop 5 to its initial state. The direction keys of rotation are made on the elements 16, 17, which allow the passage of the pulses formed above along the front of the change of the Bx signals. 1 and In 2 through the corresponding elements 19, 20, 21 and 22. At the Output 1 and Out 4, zero pulses are generated, doubled with respect to the frequency of the pulses of the rotor position sensor, and at Output 2 and Output 3 - quadruple , respectively, for the direction of rotation Forward and Backward. The appearance of interference in one of the channels, for example, Bx.1 does not cause a change in the information at the output of the differential receiver, due to the hysteresis. The appearance of chatter, for example, on the trailing edge of signal Bx.2 will not lead to malfunction of the driver, since the D-trigger b blocks the following chatter pulses at the input of the OR-NOT 12 element.

Claims (1)

SUMMARY OF THE INVENTION A position transmitter pulse generator comprising first and second D triggers connected in series and third and fourth D triggers connected in series, a clock generator connected to the C inputs of the second and fourth D triggers. the four elements are EXCLUSIVE OR, on the other hand. that, in order to increase the noise immunity and reliability, the fifth and sixth D-flip-flops, four OR-NOT elements, two differential receivers with gy0 5 0 5 0 5 0 5 0 5 steresis. six AND-NOT elements and two inverters, the outputs of the first and second AND-elements and the first and second inverters are outputs of the position sensor pulse shaper, the output of the clock pulse generator is connected to the C inputs of the first and third D-flip-flops, the direct outputs of which connected to the first inputs of the first and second EXCLUSIVE OR elements, respectively, the second inputs of which are connected to the direct outputs of the second and fourth D-flip-flops, the first input of the second EXCLUSIVE OR element is connected to the first inputs of the third and four Werth elements EXCLUSIVE OR. the second inputs of which are connected respectively to the inverse and direct outputs of the first D-flip-flop, and the outputs are connected respectively to the first inputs of the third and fourth, fifth and sixth elements AND NOT, the outputs of the first and second elements EXCLUSIVE OR are connected respectively to the first inputs of the first and of the third, second, and fourth OR-NOT elements, the second inputs of the first and second OR-NOT elements are connected to the output of the clock generator, the output of the first OR-NOT element is connected to the C-input of the fifth D-trigger and the inverse R-input D-flip-flop, the output of the second element is NOT connected to the C-input of the sixth D-flip-flop and the inverse R-input of the fifth D-flip-flop, whose inverse output is connected to the second input of the third element OR-NOT, the inverse output of the sixth D-flip-flop with the second input of the fourth OR-NOT element, the output of the third OR-NOT element is connected to the second inputs of the third and sixth AND-NOT elements, the second inputs of the fourth and fifth elements NAND - to the output of the fourth OR-NOT element, D-inputs of the first and the third D-flip-flops are connected respectively to the outputs of the first and second of differential receivers, the inputs of which are inputs of the positioner pulse generator, the output of the third AND-NOT element is connected to the input of the first inverter and to the first input of the first AND-NOT element, the second input of which is connected to the output of the fifth AND-NOT element. the output of the fourth AND-NOT element is connected to the first input of the second AND-NOT element, the second input of which is connected to the output of the sixth AND-E element and the input of the second inverter. “Hours - s4 SE "KZ" About Yu r- Kr 3poir rof 0 - "oro x, ti cj§ tS "S & is S5 6 6 h U - : ± j 1999Sh Fig.Z Sb c