SU408356A1 - MULTICHANNEL CONVERTER ANGLE OF ROTATION OF SHAFT IN CODE - Google Patents

Description

one

The invention relates to the analog-to-digital conversion technique and can be applied in information and control automated systems using digital computational techniques (DVM).

A multichannel converter of shaft rotation angle into a code, which is operated upon request from a digital computer, is known, which contains a pulse generator, an address register, a selector, a phasing circuit, a reference phase shaper, a series (in number of channels) of phase shifters (as angle sensors) and pulse shapers from sinusoidal voltages, a power source for the sensors, a pulse counter and a control unit for the gate of the resolution of the passage of reference and shifted pulses and the ready signal generation circuit.

The known multichannel shaft rotation angle converter will be ready to output the conversion result to a digital computer after requesting the channel number in time consisting of the waiting time of the reference pulse and the waiting time of the shifted pulse, i.e., up to two periods of the voltage frequency of the sensor supply voltage. However, this leads to a deterioration of the dynamic characteristics of the system, and sometimes (with a large number of channels) makes it necessary to provide for

system several simultaneous converters.

The purpose of the invention is to increase the speed of the device.

The goal is achieved by reversing the pulse counter and inserting the triggers and AND circuits into the control unit, with the outputs of the passage resolution, reference and shifted pulses connected to the single triggers, respectively, and their outputs from the phasing circuit outputs, and the outputs of the And triggered inputs with inputs of addition and subtraction of a pulse counter, inputs of the first circuit "And are connected respectively with a single output of the first trigger, zero output of the second trigger and the output of the impu generator sov and second circuit inputs "and - respectively zero yield

the first trigger, the unit output of the second trigger and the output of the pulse generator, and the ready signal generation circuit is made in the form of “AND circuits, the inputs of which are connected respectively to the single outputs of the triggers and the output of the pulse generator.

The drawing shows a block diagram of the proposed device.

The device consists of a power source of 1 sensors connected to phase shifters 2, 3, used as sensors

angles, and to the shaper 4 pulses of the reference phase. The formers 5, 6 pulses from sinusoidal yarn are connected to phase shifters 2, 3 and to the inputs of the selector 7 channels. The control inputs of the latter are connected to the outputs of the address register 8. The digital computer 9 is connected by an information input to the counter of impulses 10, which is reversible, and the address output is connected to the inputs of the address register 8 and the control unit 11. The latter contains triggers 12 and 13, whose single inputs through The gates 14 and 15 of the resolution of the passage of the reference and shifted pulses and the phasing circuit 16 are connected to the outputs of the former 4 and the selector of the channels 7. The zero inputs of the flip-flops 12 and 13 are connected to the bus 17 of the initial state, and the control inputs The valves 14 and 15 to the bus 18 are allowed to pass the reference and shifted pulses. Each of the circuits "And 19, 20, and 21 of the control unit 11 and the phasing circuit 16 is connected to the pulse generator 22 by one of its inputs. Two other inputs of the circuit" And 19 are connected to a single output of trigger 12 and zero outputs of trigger 13, circuit "And 20 - with zero output of trigger 12 and single output of trigger 13; And 21 circuits — with single outputs of Triggers 12 and 13. The outputs of And circuit 19 and 20 are connected to the add and subtract inputs of the pulse counter 10.

The device works as follows.

The sinusoidal voltage of the power source 1 of the sensors after phase shifters 2 and 3 changes its phase in accordance with the rotation angles of each of the phase shifters. From the outputs of the formers 5 and 6, pulses are shifted in time relative to the signals of the shaper 4 to the channel selector 7. The amount of shift is proportional to the angle of rotation of this phase shifter. In order to receive new information from the determined channel (sensor), the digital computer 9 supplies the channel number to the address register 8, and a conversion request to the control unit 11. The address register 8 connects to the input of the phasing circuit 16 signals from the output of the pulse maker 5 or 6 of the selected channel using the selector channel 7, which, after phase-outing the generator pulses 22, are fed to the control unit 11. Upon receipt of the request signal from the digital computer 9 , the control unit operation of the multichannel converter 11 sets the triggers 12, 13 to initial state via bus 17, and then opens valves 14 and 15 via bus 18. Triggers 12 and 13, installed in "O via bus 17," close the AND 19 circuits , 20 and 21. Control unit 11 at this time ahodits in the sleep mode or the reference arrival shifted pulses. If, after opening 14 and 15, the pulse comes first from the driver 4, it will pass through the phasing circuit 16 and the gate 14 to the single input of the trigger 12. As a result, the circuit 19 will be open and the pulses of the pulse counter will start to pass 10. Then, the incoming pulse of the selected pulse generator 5 or 6 through the channel selector 7, the phasing circuit 16 and the valve 15 sets the trigger 13 to one state, as a result of which the ' 19 circuit will turn off and stop the pulse from the transmitter. lsov 22 to the input pulse 10 and the circuit "AND otkroets counter 21 and the output control unit 11 will produce a signal of readiness to issue information to the converter 9. The digital computer that ca

the conversion cycle ends. If the first moment after opening the valves 14 and 15 comes a shifted impulse, then the circuit will work in the same way, but the order of the included triggers 12 and 13 will change,

As a result, an AND 20 circuit will be opened, which will begin to transmit pulses 22 to the input of the subtraction of the pulse counter 10.

Thus, in the proposed converter, the counting in the pulse counter 10 begins with the appearance of the first of two pulses arriving after the request — the impulse from the output of the selector of the channels 7 or impulse from the output of the shaper of the reference phase 4, and ends with the second of the incoming pulses. TaiK as each of the indicated pulses repeats with the frequency of the sensors power supply, then the counting in the pulse counter 10 ends in a time shorter than the non-period of the sensor power frequency. Typically, the capacitance of the pulse counter 10 is chosen equal to the number of pulses of the generator 22, placed in one period of the voltage of the power source of the sensors 1. In this case, regardless of the time of the request from

The digital computer 9 and, therefore, from the operation mode of addition or subtraction, in the counter 10 after the end of the transformation, the same code appears at a constant angle of rotation of the phase shifter of the selected channel. If a

the converter is made on blocks that do not contain three-input circuits “And, the latter can be made each in the form of a chain of two gates. Calculations and experimental checks confirmed the operability of the proposed converter and almost half the conversion time (while simultaneously increasing the performance of the converter).

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Subject invention

A multichannel shaft rotation angle converter into a code containing a pulse generator connected to the first input of the phasing circuit, to the second input of which an address register is connected via the channel selector, to the third input of the phasing circuit the reference impulse generator to which the source is connected

power connected to the phase shifters

the number of channels whose outputs are connected through the corresponding pulse shapers with the second and third inputs of the channel selector, a pulse counter, a control unit containing valves for enabling the passage of reference and shifted pulses, and a ready signal generation circuit, and in order to increase the speed of the device operation, the pulse counter is reversible, triggers and circuits I are inserted into the control unit, and the outputs of the gates permitting the passage of supporting and shifted impulses sov connected respectively with single trigger input, and their inputs -

with the outputs of the phasing circuit, the outputs of the circuits And are connected respectively to the inputs of the addition and subtraction of a pulse counter, the inputs of the first circuit And, respectively, are connected to the single output of the first trigger, the zero output of the second trigger and the output of the pulse generator, and the inputs of the second circuit And, respectively zero output of the first trigger, single output of the second trigger and output of the pulse generator, and the ready signal generation circuit is made in the form of a “PI circuit, whose inputs are connected respectively to single outputs Triggers and pulse generator output.