SU1185609A1 - Travel-to-digital converter - Google Patents

Abstract

TRAVEL CONVERTER TO CODE, containing a pulse generator, the output of which is connected to the first input of the first element I and the input of a frequency divider, the output of which is connected to the input of a sinusoidal voltage driver, the first output of which is connected through the first power amplifier to the first input of the phase shifter, the output of the first element And connected to the first input of the first counter, connected in series the first, second and third delay elements, the output of the first delay element connected to the second input of the first account In order to increase the accuracy of the converter, a second power amplifier and a counter, the OR element, the second and third AND elements, an amplifier-limiter, a subtraction unit ;: codes, the output of the frequency divider are connected to the first inputs of the OR element and the second element And, the second input of the sinusoidal voltage generator is connected through the second power amplifier to the second input of the phase shifter, the output of which is connected through the amplifier-limiting device: the second input of the OR element and the second element And, the output which is connected to the first input of the third element I, the second input of which is connected to the output of the pulse generator, and the output is connected to the first input of the second counter, the second input of which is connected to the output (L of the first delay element, the output is connected to the first input of the code reading unit, the second input which is connected to the output of the first counter, the third input is connected to the output of the second delay element, the output of the third delay element is connected to the third input of the second counter, the fourth input of the code reading unit and O) tr The input of the first counter, the output of the OR element, is connected to the input of the first delay element and the second input of the first element, AND, the output of the code reading unit is the output of the converter.

Description

The invention relates to automation and computer technology and can be used in phase trace systems of computer numerical control systems, industrial robots and coordinate tables. The purpose of the invention is to increase the accuracy of the transducer when measuring bulk movements. FIG. 1 shows a block diagram of a converter; in fig. 2 is a signal timing diagram illustrating the operation of the converter. The converter contains a generator of 1 pulses J divider 2 frequencies, a driver of 3 sinusoidal voltages and Ujyj-sin wt, 1) 2 wt, amplifiers A. and 5 power, phase shifter 6 (linear or circular inductosyn in phase mode), amplifier limiting 7, element OR 8 , And 9, 10, and 11 elements, counters 12 and 13, delay elements 14 and 15, code reading unit 16, delay element 17. The converter operates as follows. The pulses 18 from the generator 1 (Fig. 2 are fed to the elements of And 10 and 11 and the frequency divider 2). From the output of the latter, a pulse signal 19 is removed (Fig 2), which serves as a reference signal and is fed to the driver 3 sinusoidal voltages. generates two equal in amplitude and orthogonal voltages 20 (Fig. 2) that are applied to the power windings of the phase shifter b through power amplifiers 4 and 5. Signal 21 (Fig. 2) always shifted relative to the reference voltage c, proportional to the measurement on the phase shifter 6 the magnitude of the displacement of the phase shaft spatula 6. It is generally equal to Ug K and sin (wt -f oi), where Kg is the transfer ratio (transformation) of the phase shifter 6. Using amplifier-limiter 7, the signal Ilg is converted into a pulse sequence of signals 22 whose edges coincide with the moments of transition of the sinusoid Ug through zero (Fig. 2). Using the element OR 8, pulses 23 are formed (Fig. 2), the duration of which is proportional to the phase angle (L + d). At the output of the element And 9, pulses 24 are formed (Fig. 2 ) duration which is proportional to the angle (t - pC). Using the elements 10 and 11, the obtained time intervals are filled with high frequency pulses 25 and 26 (Fig. 2), which are counted by the corresponding counter 12 or 13 and are outputted from the delay element 14 to the code reading unit 16. Block 16 generates a result code N equal to the difference of the numerical equivalents of pulses from the outputs of the elements OR 8 and AND 9, i.e. N N - N. The result of the measurement is proportional to twice the value of the angle cc. It is signaled by a delay element 15. The delay element 17 is designed to generate a common reset signal, by which the counters 12 and 13 and the code subtracting unit 16 are returned (set) to their initial state. Thus, the displacement transducer to the code ensures the allocation and transformation to the code of a time interval proportional to a double phase shift between the output voltage of the phase shifter b and the reference voltage. Therefore, the phase angle can vary in the range from 0 to 360. This makes it possible to double the accuracy of measuring small displacements, since the number of Counting pulses increases so many times.

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Claims (1)

A MOVING CONVERTER IN A CODE containing a pulse generator, the output of which is connected to the first input of the first element And and to the input of the frequency divider, the output of which is connected to the input of the sinusoidal voltage generator, the first output of which is connected through the first power amplifier with the first input of the phase shifter, the output of the first element And connected to the first input of the first counter, the first, second and third delay elements connected in series, the output of the first delay element connected to the second input of the first counter, from characterized in that, in order to increase the accuracy of the converter, a second power amplifier and a counter, an OR element, a second and third AND element, a limit amplifier, a code subtracting unit, the output of the frequency divider are connected to the first inputs of the OR element and the second of the And element, the second input of the sine voltage shaper is connected through the second power amplifier to the second input of the phase shifter, the output of which is through the amplifier-limiter; the body is connected to the second inputs of the OR element and the second I element, the output of which is connected is connected to the first input of the third AND element, the second input of which is connected to the output of the pulse generator, and the output is connected to the first input of the second counter, the second input of which is connected to the output of the first delay element, the output is connected to the first input of the code subtraction unit, the second input which is connected to the output of the first counter, the third input is connected to the output of the second delay element, the output of the third delay element is connected to the third input of the second counter, the fourth input of the code subtraction unit and the third input of the first counter a, the output of the OR element is connected to the input of the first delay element and the second input of the first AND element, the output of the code subtraction unit is the output of the converter. SU „1185609 1 1185609 2