SU1266006A1 - Converter of shift to phase of a.c. signal - Google Patents

Abstract

The invention relates to the field of automation and can be used to connect analog information sources with phase shift to code converters. In order to increase the accuracy of the converter, a phase splitter and additional modulators were introduced into it, and the low-frequency signal driver was made multiphase. The sine-cosine sensor (inductosin) is powered by a high-frequency sine wave signal from the generator. The output signals of the inductosyn are fed to the information inputs of the level drivers, to the other inputs of which signals of a high-frequency generator limited in amplitude are received. At the outputs of the level drivers, signals are generated corresponding to the positive and negative straightened signals of the inductosin against the background of the constant voltage of the bias source. The number of pairs of levels is equal to the number of inductosin output windings. From the output signals of the level drivers in the phase splitter, additional voltage levels are formed corresponding to the intermediate phases of the output voltages of the level drivers. In modulators, voltage levels are modulated in amplitude by low-hour bit signals. The modulated low-frequency frequency signals are added together, and a harmonic component is extracted from them, the phase shift of which relative to the modulating voltage is proportional to the movement of the inductosin. 1 hp ff, 2 ill. y O5 o

Description

The invention relates to automation and can be used to connect analog information sources with phase shift to code transducers.

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

Figure 1 shows the structural: converter circuit; figure 2 - timing diagram of the operation of the Converter.

The transducer to the phase of the alternating signal contains a sine-cosine sensor 1, a high-frequency generator 2, a block 3 of limiter amplifiers, first 4 and second 5 level drivers, phase splitter 6, first 7 and second 8 modulators, additional modulators 9 and 10, driver 11 low-frequency signals, the adder 12 and the filter 13.

In the sine-cosine sensor 1, the volaric windings are connected via resistors 14 to a source 15 of a constant bias voltage. The terminals of the secondary windings of the sensor 1 are installed capacitors 16 for adjusting the output circuits of the sensor 1 in resonance with the frequency of the oscillator 2. The drivers 4 and 5 levels contain keys 17, the output of which is connected to a resistor 18. Phasor splitter 6 contains summing amplifiers 19 | -194, each consists of input resistors 20, a variable feedback resistor 21 and an operational amplifier 22. Low frequency signal former 11 contains a low frequency generator 23, the phase outputs of which are connected in pairs to resistors 24. Ka each of the modulators. 7-10 contains the keys 25 and resistors 26. At each of the inputs of the adder 12, serially connected junction capacitors 27 and resistors 28 are installed, the terminals of the resistors are combined. The common connection point of the resistors 28 and the resistor 29 is connected to the inputs of the operational amplifier 30, which is blocked by negative feedback through the resistor 31.

The Converter operates as follows.

A sinusoidal high frequency is applied to the input of the sine-cosine sensor 1 from the high-frequency generator 2. On the output windings of the sensor 2, alternating current signals are generated on a phase, modulated in amplitude as a function of sine and cosine of movement. The output signals of one of the windings of the sensor 1 are shown in FIG. 2a, 6.

A sinusoidal voltage from the output of the generator 2 is fed to the input of the block 3, the outputs of which generate square-wave signals of the type square with the frequency of the oscillator 2 (Fig. 2c, d). The diagrams (FIG. 2) correspond to the position of sensor 1 when the amplitude of the signals of one of its SECONDARY windings is maximum and the amplitude of the signals of the other secondary winding is zero.

The output signals of sensor 1 are gated on the formers 4 and 5 by the output signals of block 3. As a result, at one output of the former 4, a signal is formed that corresponds to the positive half-wave signals from the sinus output of the sensor 1 against the background of a constant voltage of the bias voltage source 15 (Fig. 2). ), and at the other output of the imaging device 4, a signal is formed corresponding to the negative half-wave signals from the sine output of the sensor 1 against the background of the constant voltage of the bias voltage source 15 (Fig. 2e). Similarly, the shaper 5 produces voltage levels that are on the amplitude in accordance with the signal from the cosine output of sensor 1. The voltage levels from the outputs of every two shapers 5 and 4, equivalent to spatial phases shifted by d / 2 (if the number of outputs of sensor 1 is n, then 2 / n) is fed to the inputs corresponding to its summing amplifier 19. Resistor 21 in the feedback circuits of amplifiers 22 is adjusted so that the transfer coefficient of the summing amplifier is equal to 0.707 io to each of its inputs. The resulting output voltage level of each sum of the amplifier amplifier is equivalent to the spatial phase of sensor 1 shifted by 1/4 with respect to the spatial phases of the input signals of this amplifier. Thus, the phase splitter 6 generates additional voltage levels corresponding to the intermediate phases of the output voltages of the formers 4 and 5. Parasite voltages from the outputs of the formers 4 and 5 and from the outputs of the phase splitter 6 are fed to the information inputs of the modulators 7-10.

Claims (2)

On the paraphase outputs of the imaging unit 11, low-frequency square wave signals of the meander type are produced, which are shifted relative to the adjacent output signals of the imaging unit 1 by 1/8 of the period of these signals. The signals on one of the pairs of outputs of the imaging unit 11 are shown in FIG. 2, 3. The output signals of the imaging unit 1 are fed to the control inputs of the modulators 7-10, the outputs of which form signals with the frequency of the imaging unit 1 signals and an amplitude equal to the amplitude of the output sensor 1 (Figures 2 and, k, l, m. The output signals of the modulators 7-10 are fed to the inputs of the adder 12. Only the variable components of these signals pass through the coupling capacitors 27 to the inputs of the operational amplifier 30. At the output of the adder 12 a step signal is generated 2 n), from which the filter 13 selects the first harmonic component (2 о), the phase shift of which relative to the output voltages of the shaper 14 is proportional to the measured displacement. Variable resistors 24 connected between the phase outputs of the formers 11 are intended to compensate for minor differences in the transfer ratios of the drivers 4 and 5 and the modulators 7 to 10. This compensation is carried out when adjusting the converter. Claim 1. Transducer of displacement into phase of alternating signal containing high-frequency generator, output of which is connected to input of sine-cosine sensor and input of amplifier-limiter unit, outputs of amplifier-limiter unit are connected to control inputs of the first and second level drivers, informational inputs of which connected to the first and second paraphase outputs of the sine-cosine sensor, respectively, the outputs of the first and second level drivers are connected to the information input The first and second modulators, respectively, the control inputs of which are connected to the first and second paraphase outputs of the low-frequency signal generator, respectively, the outputs of the first and second modulators are connected to the first and second inputs of the adder, the output of which is connected to the filter input, the output of the filter is output a converter, characterized in that, in order to increase the accuracy of the converter, a phase splitter, additional modulators were introduced into it, and a low-frequency signal driver was made multiphase, the phase splitter inputs are connected to the output of the level drivers, and the paraphase outputs are connected to the information inputs of additional modulators, the control inputs of which are connected to the corresponding additional low-frequency signal generator outputs, tori connected to the corresponding regulatory inputs shaper low-frequency signals. 2. The converter according to claim 1, wherein the phase splitter comprises first, second, third and fourth summing amplifiers, the inputs of which are pairwise combined and are the inputs of the phase splitter, and the outputs of the summing amplifiers are paraphase outputs of the phase splitter. V OL A 1D YAP lllll vww: l / w: s: n Mh (Rig.2