SU1307391A1 - Multichannel converter of inductive transducer parameters to pulse signal - Google Patents

Abstract

The invention relates to electrical measuring equipment. Introduction to the multichannel converter of the parameters of inductive sensors into a pulse signal of a resistor 5, trigger 15, a logic multiplier 14, 20, and new electrical connections between functional elements increases its speed by reducing the level of stored energy in the inductance of the differentiating transformer and ensuring optimal dissipation energy after the conversion process is complete. 1 il. 9 (L

Description

JO

This invention relates to electrical measuring technology.

The purpose of the invention is to increase the speed by reducing the time taken to poll the sensors, reducing the level of stored energy in the inductance of the differentiating transformer in the process of converting the sensor parameters to a pulse signal and ensuring optimal dissipation after the conversion process is completed.

The drawing shows a diagram of a multichannel converter converting the parameters of inductive sensors into a pulse 5 signal.

The multichannel converter of parameters of inductive sensors into a pulse signal contains terminals 1 for connecting inductive sensors, a differential transformer 2, a block of 3 analog switches, a source of 4 constant voltage, a resistor 5, a switch 6, a buffer amplifier 7, a time selector 8, an operational amplifier 9, diode 10, capacitor 11, bit switch 12, amplitude detector 13, driver 14, trigger 15, clock generator 16, control unit 17, distributor 18, coincidence unit 19 and logic multiplier 20, inductive sensors via terminals 1 for connecting them and analog switches 3 are connected

20

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the output of the control block 17 connected to the generator 16 clock pulses. The first output of block 17 is connected to a control of the input of the bit switch 12 and the input of the distributor 18. Each of the n (by the number of channels) outputs of the distributor 18 is connected to one of the inputs of the corresponding logical block of matches. The outputs of the coincidence unit are connected to the corresponding control inputs of a pair of analog switches. The second inputs of the elements of the coincidence unit 19 are combined and connected to the output of the trigger 15. The output of the trigger 15 is also connected to the control input of the shunt key bis one of the inputs of the logical multiplication unit 20. The second input of the unit 20 is connected to the second output of the control unit 17, and the output to the control unit; it uses the input of the time selector 8. The multichannel converter of the parameters of the inductive sensors to a pulse signal works as follows.

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The generator 16 starts the control block 17, which produces clock pulses at its first output. The clock pulses are fed to the distributor 18, to the S input of the trigger l5a 15 and to the control input of the discharge switch 12. The discharge switch 12 for the time of action of the clock pulse by the primary winding differential 35 and discharges the capacitor 11 of the transformer 2. To zero level existing

by this time the amplifier input

Between middle points of windings9. At the same time, the trigger 15 of the installers and the grounded midpoint of the primary winding of the transformer 2 40 includes a constant voltage source 4. A chain of series-connected resistors 5 c shunt key 6 is connected in parallel to the output winding of the differentiating transformer 2, which is connected to the input of the buffer amplifier 7. The output of the amplifier 7 through the time selector 8 is connected to the non-inverting input of the operational amplifier 9, which together with the diode 10, the capacitor 11 and the bit switch 12 forms an amplitude detector 13. The connection point of the diode 10, the capacitor 11 and the key 12 is an output and is connected to the inverted, 5 bath by one of the sensors connecting the input m amplifier 9. Output to the terminals 1 by a pair of keys 3, the differential amplifier 9 is connected through the driver 14 to the R-input of the trigger 15, the S-input of which is connected to the first

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It is set to state 1, open key 6 and signaling a single level to the combined inputs of block 19 of coincidence. With the arrival of each clock pulse, the distributor sequentially generates and supplies single-level signals to the corresponding second inputs of the coincidence block 19. As a result, a control signal is generated alternately at each of the outputs of block 19 of the coincidence. Q When a control signal is received from the output of block 19 of coincidence to the control input of the corresponding pair of analog switches, the latter are closed. In the measuring circuit, it is transformed by a transformer 2 and a constant voltage source 4 with a constant voltage source 4.

the output of the control block 17 connected to the generator 16 clock pulses. The first output of block 17 is connected to a control of the input of the bit switch 12 and the input of the distributor 18. Each of the n (by the number of channels) outputs of the distributor 18 is connected to one of the inputs of the corresponding logical block of matches. The outputs of the coincidence unit are connected to the corresponding control inputs of a pair of analog switches. The second inputs of the elements of the coincidence unit 19 are combined and connected to the output of the trigger 15. The output of the trigger 15 is also connected to the control input of the shunt key bis one of the inputs of the logical multiplication unit 20. The second input of the unit 20 is connected to the second output of the control unit 17, and the output to the control unit; it uses the input of the time selector 8. The multichannel converter of the parameters of the inductive sensors to a pulse signal works as follows.

9. Simultaneously, the trigger 15 having installed one of the sensors connected to the terminals 1 by a pair of keys 3, dif-

It is set to state 1, open key 6 and signaling a single level to the combined inputs of block 19 of coincidence. With the arrival of each clock pulse, the distributor sequentially generates and supplies single-level signals to the corresponding second inputs of the coincidence block 19. As a result, a control signal is generated alternately at each of the outputs of block 19 of the coincidence. When a control signal is received from the output of the coincidence block 19 to the control input of the corresponding pair of analog switches, the latter are closed. In the measuring circuit formed by one of the sensors connected to terminals 1 by a pair of keys 3,

transformer 2 and a constant voltage source 4 begins the transient process of converting the difference between the inductance of the sensor cell and a positive signal, the amplitude of which is proportional to

8 - (L - L,) / (L2 + L,),

where L. and L are the inductances of the upper and lower arms of the sensor, respectively.

When this occurs, the accumulation of energy in the transformer 2.

In order to eliminate the influence of the parasitic burst on the further conversion, the time selector 8 closes the input of the amplifier 9 for the time when the possibility of the parasitic burst is possible. Dp this at the output of block 20 is formed of the control pulse, as. conjunction of the signal from the second output of the control unit 17 and the signal from the output of the unit 15. The selector 8 closes on the falling edge of the pulse generated by the trigger 15. The voltage V goes to the non-inverting input of the amplifier 9 and charges the capacitor 11 through diode 10 to an amplitude value of the signal Ug ,,,. When Ugy decreases, the capacitor 11 remains charged to an amplitude value, since the voltage from the capacitor is fed through the feedback circuit to the inverting input of amplifier 9. The operational amplifier then goes from positive saturation to negative saturation and locks diode 10. Therefore, charging The capacitor 11 remains almost unchanged for the time required to convert the amplitude of the signal to a digital code. The voltage taken from the capacitor 11 is the output signal of the converter and, if necessary, is converted into a digital code.

When the amplifier 9 goes into the region of the negative, the output voltage from the amplifier 9 is fed to the driver 14. The signal from the driver output returns the trigger 15 to the zero state. At the same time, the output signal of the coincidence unit 19 opens a pair of analog switches 3. At the same time, switch 6 is closed. A process of dissipation of energy accumulated in transformer 2 begins. Resistor 5 is switched on in series with switch 6, the resistance of which

R -0,5r,

where p

1 - | s, p / s,

R

C and L, p - self1) 1e capacity and

inductance of the differentiating transformer 2, g - resistance of the output winding of the transformer 2. In the critical mode, the output voltage (assuming p = 7 g) is equal to

Iv, with and (1) - -,

.1-1

where is about

2L

2RC 2RC

Ug - the value of U ej, | y at time t,

I - current through the output winding of the transformer 2.

The time selector 8 transmits to the input of the operational amplifier 9 a signal maximum and an adjacent area.

The shaper 14 generates at its output a short pulse on the negative period at the input. Formula inventions

Multichannel co-converter of parameters of inductive sensors into a pulse signal containing terminals for connecting differential inductive sensors connected to the primary winding of a differentiating transformer via an analog switch block, a key one of whose terminals is connected to one output of the output winding of a differentiating transformer, both of which are connected to a differential input a buffer amplifier whose output is connected through a time selector with an amplitude detector, the source is constantly a voltage terminal coupled with secondary inductive sensors through one of the terminals, a clock pulse generator, whose output is connected to

.

the input of the control unit; the first output of the unit is connected to the control input of the amplitude detector and the input of the distributor, the outputs of which are connected to the inputs of the coincidence unit, the outputs of which are connected to the control inputs of the analog switch unit, in order to increase speed by reducing the level stored energy in the inductance of the differentiating transformer and ensuring optimal energy dissipation

513073916

after completion of the conversion process, the installation input of which is connected to

vania, a resistor is inserted into it, the first output of the control unit, and

the trigger, driver, and the logic-output block of the trigger are connected to the control

multiply whom, with one output by the re-input of the key, with the second input of the block

the sensor connected to another output of g matches and one of the inputs of the block

key, and the other output - with another you-logical multiplication, the second input

water differentiating transform which is connected to the second exit

a torus, an additional output of the amplitude-control unit, and the output of the login detector unit through the multiplier is connected to a trigger reset input, a jogging input of the time selector.

Claims (1)

Claim A multichannel converter of parameters of inductive sensors into a pulse signal, containing terminals for connecting differential inductive sensors connected to the primary winding of the differentiating transformer through an analog switch block, a key, one of the terminals of which is connected to one output of the output winding of the differentiating transformer, both of which are connected to the differential input buffer amplifier, the output of which is connected through a time selector to an amplitude detector, a constant source voltages connected to the middle output of inductive sensors through one of the terminals, a clock pulse generator, the output of which is connected to the • input of the control unit, the first output of the unit is connected to the control input of the amplitude detector and the input of the distributor, the outputs of which are connected to the inputs of the matching unit, the outputs of which are connected with control inputs of an analog key block, characterized in that, in order to improve performance by reducing the level of stored energy in the inductance of the differentiating transformer In order to ensure the optimal mode of energy dissipation after the conversion process is completed, a resistor, a trigger, a shaper, and a logical multiplication unit are introduced into it, moreover, one terminal of the resistor is connected to another terminal 5 of the key, and the other terminal to another terminal of the differentiating transformer, an additional output of the amplitude detector through the former is connected to the trigger reset input, 1C the installation input of which is connected to the first output of the control unit, and the trigger output is connected to the control input of the key, from the second and an input unit matches with one of the inputs of the multiplication logic unit, a second input coupled to the second output of the control unit, and the output of the multiplication logic unit is connected to a control input of the selector temporary. Editor A. Revin Compiled by N. Krinov Tehred L. Serdyukova Corrector M. Demchik Order 1628/45 Ti ^ as much as 731 Subscribed VNIIIPI of the USSR State Committee for Inventions and Discoveries 1 13035, Moscow, Zh-35 ', Raushskaya nab., 4/5 Production and printing company, Uzhhorod, st. Project, 4