SU907568A1 - Shaft angular position-to-time interval converter - Google Patents

Description

(54) CONVERTER ANGLE OF TURNING THE SHAFT DURING A PULSE

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The invention relates to automation and computer technology and can be used, for example, in v information and measurement systems for constructing analog-to-digital converters of angular displacements of a shaft associated with a controlled object.

A device is known that operates in accordance with the principle of preliminary allocation of the smaller and larger of the output signals of a sine-cosine angle sensor (SKDU) with the subsequent calculation of their ratio. It also includes phase sensations, mitepes, inverters, comparators, the outputs of which are connected to the inputs of the decoder, and a block of elements AND, whose control inputs are connected to the outputs of the decoder, and the outputs from the inputs of the LUHecto dividing unit of this device are restricted. opportunities.

The closest in technical essence to the present invention is a shaft angle-to-pulse converter that contains a power source of power supply, a SKDU, the outputs of which are connected to the corresponding inputs of comparators through rectifiers, a logic unit, one output of which is connected to the first trigger input, which output Go through the controls to the input of the source of a saw-tooth for example, is connected to the inputs of the comparators and the input of the zero-organ, the output of which is connected to the second input of the trigger,

tS another logic unit input is the output of converter 12.

However, a lime transformer has a tangent (cotangent) conversion characteristic,

To what limits its functional capabilities.

The purpose of the invention is to expand the functionality of converting the shaft angle of rotation to the duration of the pulses. The goal is achieved by converting a shaft angle converter into a pulse duration, containing a voltage supply source, a sine-cosine No. 1 angle sensor, the outputs of which are connected via rectifiers to the corresponding inputs of the first and second comparator logic block, oh, the output of which connected to the output of the converter, and another output connected to the first input of the trigger, the output of which through the control input of the sawtooth source is connected to the other inputs of the comparators and the INPUT of the zero-organ, the output of which is connected to the second trigger input, a control unit, a voltage divider, a third comparator and a third rectifier, the output of which through a voltage divider under the key is connected to the corresponding input of the third comparator, the output of which is connected to the first input of the control unit, which outputs connected to the inputs of the logic unit, the outputs of the first and second devices are connected respectively to the second and third inputs of the control unit, and the power supply source is connected to the input of the third rectifier, and the input is zero l-organ is connected to another input of the third comparator. The drawing shows a structural diagram of the proposed converter. The rotation angle of the shaft shaft to the code contains SKDU 1, rectifiers 2-4, voltage divider 5, source 6 sawtooth voltage comparators 7-9, zero-body 10, control block 11, set inputs 12-14, element OR 15, elements AND 16-22, elements OR 23 and 24, logic block 25, AND-NOT elements 2 and 27, elements NOT 28 and 29, trigger 30 and power supply source 31 potential of a high level corresponding to the level of a logical unit to one of the installation inputs 12- 14 conversion sets its operation mode. The Converter angle of rotation of the VA in the power of the pulses is as follows. For a converter operating mode with a tangent (cotangent) conversion characteristic, the control potential of a high level is fed to the installation input 14, preparing a circuit for passing potential signals of the comparators 7 and 8 to the corresponding inputs of the logic unit 25. The outputs of the SKDU 1, rectified by the rectifiers 3 and 4, respectively (voltages of the rectifier outputs are denoted by Uju U (, J), connected to the first inputs of the comparators 7 and 8, and to the second inputs - linearly varying voltage U, from the source output n Voltage gains IIT) 6. In the initial position O of the trigger 30, the voltage IL increases and as it increases it reaches the level of voltages and „„ (first smaller U,., and then more and, from Hiix), causing in moments of equality DC UQ Up triggered corresponding comparators. If U - C, Ug U2e, (B 1,4,5 and B octants of the range of change of the rotation angle of the 6-rotor of the SKDU 1), then the comparator 7 works first, and then the comparator 8, if Od, Ufc (2.3 , 6 and 7 octants), then the sequence of comparing comparators is reversed: first, the comparator 8 is exhausted and then the comparator 7. The high level signal from the output of the activated comparator 7 (c) is fed through the control unit 11 to the corresponding input of the 25 V logic unit point in time when both inputs of logic unit 25 will have high level signals (i.e., when performing equal and Ug-)., it will work and the difference 1 - O will transfer trigger 30 to position 1, and the direction (gradient) of the sweeping sawtooth voltage Uj-. will change (it begins to decrease according to a linear law) and immediately the comparator, previously triggered at the time of the equality U, Ug returns to the initial state, and after some time (at the time of the equality U, U), another comparator returns to the same state. The moment the voltage is reached and the zero level is triggered by a null-organ 10, the pulse from whose output returns the trigger 30 to its original state 1 O, in the result the

the u increase begins to increase again and the measurement cycle repeats.

The change in the potential level of the output signals of the comparators 7, 8 is transmitted through the control unit 11 and the logic unit 25 to the output of the converter, from which pulses are taken with a duration C, proportional to the ratio. Obviously, in octants it is 1,4,5 and 8 T f (tg), and in the remaining octant it is C-fCctg0).

For a converter with a sinus (. Cosine) conversion characteristic, a high level control potential is supplied to a stable input 13 of the converter, preparing the potential signal passing circuit of one of the comparators 8.7 and 9 to the corresponding inputs of the logic unit 25.

Through the rectifier 2 connected to the power supply source 31 and the voltage divider 5, a reference voltage Ufl is formed, the value of which is set to Ufg-2 P ° A. In this mode, the comparators 7 (8) and 9 need to be triggered sequentially as the sawtooth voltage sweeps and equality of and is performed. (in 1,4,5 and 8 octants Uw C

remaining octants

fB.

m - "UQUM 25) -and with Up

in the initial position O of the trigger 30, the voltage from the output of the PSI 6 increases and as it increases it reaches the level of the voltage Uts and Up. When the equality U, U is fulfilled (a high level signal from the output of one of the comparators 7 or 8, triggered first (i.e. from the output of the comparator 7 in 1,4,5 and 8 octants or from the output of the comparator 8 in the remaining octants), through the control block 11 is fed to one input of the logic block 25, when equalization is performed, and the UQ high level signal from the output of the comparator 9 through the block 11 control is fed to another input of the logic unit 25..

The further sequence of operations is similar to that discussed above for the first mode. The change in the potential level of the output signals of the comparators 7 (8) and 9 is transmitted to the output converter i from which pulses are taken with a duration T2 proportional to the ratio

 Obviously, in octants 1,4,5 and 8 tii F (sin), and in the remaining octants T2 (convocation). .

For the mode of operation of the device with a secant (coecant) conversion characteristic, the high level control potential is supplied to the installation input of the 1 2 converter.

0

In this mode, it is necessary to sequentially (as the sawtooth voltage sweeps)

equalities and

Uo and and and.

where Up is the larger of the stresses Ujg,

 iu (1, 4.5 and 8 octants Ug

in the remaining octants Ug-,

In this case, the operation of the converter is similar to that considered for the first two modes. Pulses with a duration proportional to the ratio U (5 / U |. Obviously, in octants I, 4.5 and 8 Tj (five coils), and in the other octants - T

5 (cosec €).

Thus, the converter of the angle of rotation of the shaft into the pulse duration allows to obtain not only the tangent (cotangent), but also

sine (cosine) or 1second (cosecant) transform characteristics.

Claims (2)

Invention Formula A shaft rotation angle to pulse duration converter containing a voltage supply source, a sine-cosine angle sensor, whose outputs are connected via rectifiers to the corresponding inputs of the first and second comparators, a logic unit, one output of which is connected to the converter output, and the other output is connected to the first trigger input, the output of which through the control input of the source of the saw-tooth voltage is connected to the other inputs of the comparators and the input of the zero-body, the output of which is connected to the second input of the tr A goyager, characterized in that, in order to expand its functionality, a control unit, a voltage divider, a third comparator and a third rectifier are inputted to the converter, the output of which is connected via a voltage separator to the co.909 response input of the third comparator, the output of which is connected to the first input control unit, the outputs of which are connected to the inputs of the lochic unit, the outputs of the first and second comparators are connected respectively to the second and third inputs of the control unit, and the power supply voltage connected to the input of the third rectifier, and the input of the null organ is connected to another input of the comparator. Sources of information taken into account in the examination - 1. Electronic Design, 1970, № 6, p. 183, fig. eight. 2. USSR author's certificate No. 619943, cl. G 08 C 9 / OD, 07.22.76 (prototype). and Kt