SU523110A1 - Angular displacement transducer to code - Google Patents

Description

(54) ANGULAR TRANSFER CONVERTER TO CODE

The proposed device relates to converters of angular movements into a digital code and can be used in measurement technology and automation.

Known Converter angle of rotation of the shaft in the code that contains the rotary phase shifter-sensor, serially connected pulse generator, frequency divider and amplifier-shaper, the output of which is connected to the input of the rotary phase shifter of the sensor, and the logic circuit of the signal processing from the sensor 1.

In such a converter, the phase shift between the reference signal fed to the input of the phase shifter and the measured sinusoidal signal produced by the output of the phase shifter is converted into a time interval and then measured during a time-pulse coding unit using pulses of the reference frequency. However, the known converter is characterized by insufficient accuracy of operation.

The closest in technical essence to the proposed device is a shaft rotation angle converter into a code comprising a phase shifter, the output of which is connected to the first input of the phase detector, a pulse generator connected to the input of a frequency divider, a counter, a valve and a memory block 2.

This device also does not provide a sufficiently high accuracy.

The purpose of the invention is to improve the accuracy of the device.

This is achieved by introducing a phase-shifting unit, a threshold element, keys, a differential amplifier, peak detectors, and driver amplifiers into the device. Input of the first amplifier maker

connected to the output of the frequency divider, and the output directly to the input of the phase shifter and through the threshold element to the first input of the counter. The output of the pulse generator is connected to the second input of the counter and the first

the inputs of the keys, the outputs of which through the peak detectors are connected to the inputs of the differential amplifier, and the output of the latter with the first input of the phase-shifting unit connected to the third input

Claims (2)

counter and the second input of the phase detector. The output of the phase detector is connected to the second inputs of the keys, the output of the phase shifter through the second amplifier-shaper is connected to the second input of the phase-shifting unit. pa 4 pulses, and output k to the first input of the phase detector 5 connected to the first inputs of keys of different polarities 6, 7, the second inputs of which are connected to the output of the pulse generator, and the outputs through unipolar detectors 8, 9 to the inputs of the differential amplifier 10. The output of the amplifier is connected to the first input of the phase-shifting unit 11, the second input of which is connected to the phaser-power input through the selective amplifier-driver 12, and the output of the phase-shifting unit to the second input of the phase detector 5 and one input of the counter 13, others the inputs of which are connected respectively to the output of the generator of 4 pulses and through the threshold element 14 to the output of the amplifier maker 2. The converter of angular interferences, code, works as follows. The rotary phase shifter-sensor 1 is fed from the amplifier-driver 2 by a reference sinusoidal signal, which also goes to the input of the threshold element 14. The output signal of the rotary phase-shifter 1 is fed to the input of the selective amplifier-amplifier 12 and to the first input of the phase detector 5, to the second input of which passes the signal from the output of the phase-shifting unit I. The signal taken from the output of the selective shaping amplifier 12 is fed to the input of the phase-shifting unit. The output signal of the phase-shifting unit 11 and the signal from the output of the threshold element 14, respectively, are fed to the first inputs of the counter 13, the third input of which receives the high frequency pulses of the generator 4. The output of the counter 13 forms a code equivalent to the phase difference between the reference signal and the output signal from the phase-shifting unit. The output signals from phase shifter 1 and from phase shifter unit 11 are compared in phase detector 5 to phase. The output signal of the phase detector is fed to the control inputs of keys 6, 7, and the signal inputs of keys 6, 7 are fed with high frequency pulses from generator 4. Peak detectors 8 or 9 are charged to a certain amplitude from output pulses of keys 6, 7. Amplitudes of output The signals of the peak detectors 8, 9 in the differential amplifier 10 are subtracted, and the resulting difference signal is fed to the control input of the phase-shifting unit 11. When a phase error occurs in the circuit of the formation of the useful signal due to the phase Because of the selectivity of the selective amplifier -former 12 or the phase-shifting unit 11, the output signal of the phase detector 5 produces a mismatch signal of positive or negative polarity. keys (6 or 7). A public key, Example 6, passes pulses from the generator 4 to the input of the corresponding peak detector 8. The peak detector begins to charge according to a certain law, and an increasing DC signal appears at its output. This signal is supplied through the differential amplifier 10 to the control input of the phase-shifting unit 11, as a result of which the phase shift is changed until the phase error is compensated and the error signal becomes zero. The key 6 is closed, and the peak detector 8 memorizes for some time the control voltage at which the signals are equal. When the equality of signals changes, for example, due to a leakage of the voltage of the peak detector, a mismatch signal arises, which with the help of the corresponding key charges the peak detector and, therefore, restores the indicated equality of signals. Thus, in the proposed converter, the phase error of the measuring channel is absent and the conversion in statics is highly accurate by eliminating the phase instability of the frequency-dependent elements of the useful signal forming circuit on the conversion accuracy and by reducing the influence of the phase error in the useful signal forming circuit changing the frequency of the sensor signal for conversion accuracy. The invention of the Converter of angular movements in the code containing the phase shifter, the output of which is connected to the first input of the phase detector, a pulse generator connected to the input of the frequency divider, and a counter, o tl and ch and, in order to improve accuracy device operation, phase shifting unit, threshold element, keys, differential amplifier, peak detectors and driver amplifiers are entered into it, the input of the first amplifier-former is connected to the output of the frequency splitter, and the output is directly connected to the input of the phase shifter and through the threshold element to the first input of the counter, the output of the pulse generator is connected to the second input of the counter and to the first inputs of the keys, the outputs of which through the peak detectors are connected to the inputs of the differential amplifier whose output is connected to the first input of the phase-shifting unit whose output is connected to the third input of the counter and to the second input of the phase detector, the output of which is connected to the second inputs of the keys, the output of the phase shifter through the second amplifier-shaper is connected to the second th input phase shifting unit. i. Zverev A. E. and others. Angular displacement transducers into a digital code, “Energie, L., 1974, p. 154. 2. Zverev A.Yo. and others. Angular displacement transducers into a digital code, “Energia, L., 1974, p. 79 (prototype). .