SU1328930A1 - Linear converter of pulse duration signals - Google Patents

Abstract

The invention relates to instrumentation engineering and can be used as a secondary converter for sensors with a pulse-width output. The purpose of the invention is to increase the noise immunity. The device contains a controlled current source 1 and a trigger 8. Introduction of a former 6 pulses, comparators 3. and 13, key 7, element OR 4, resistors 5 and 12, diodes 10 and 11, and elements AND 9 ensure the introduction of a selection of input pulses in duration. Moreover, the nopord value of the time selection is directly proportional to the voltage on the bus 15 utflenlenii. 1 1 hp f-ly, 1 ill. oo yu 00 with so

Description

one

The invention relates to instrumentation engineering and can be used as a secondary transducer for sensors with a pulse-width output.

The purpose of the invention is to expand the functionality by ensuring the formation of output pulses with a duration of both longer and shorter duration of the input pulses.

The drawing shows a functional electrical circuit of a linear pulse converter over its duration.

The device contains a controlled current source 1, a capacitor 2, a comparator 3, an element OR 4, a resistor 5, a driver 6 pulses j, a switch 7, a trigger 8, an element AND 9, the first 10 and second 11 diodes, an additional resistor. 12, additional comparator 13. The inputs of the current source 1 and the pulse shaper 6 are connected to the input bus 14, the inverse of the comparator 13 is connected to the control bus 15, and the output of the AND 9 element to the output bus 16, The source output

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current is connected to the first connector of a koizo series-connected diode 2, the forward input of the comparator 13 and the first output of the key 7, the second output of which is connected to the common bus and the control input is to the input of the OR 4 element. the capacitor 2 is connected to the inverter input of the comparator 3, through the register 12 to the anode of diode 10, and through a resistor 5 to the cathode of diode 11 and the first inputs of element I.PI 4 and element 9, the cathode of diode 10 and anode of diode 11 are connected with the output of the comparator 3. The information input of the trigger 8 is connected to the output the comparator 13, the contact input with the output of the imaging unit 6 and the second input of the element 4, and the output with the second input of the element And 9.

The Converter operates as follows.

When the input pulse arrives at the bus 14, the current source 1 begins to charge the capacitor 2 with a stable current, which causes a linear increase in the voltage across it. By the end of the pulse on the bus 14, the voltage that stabilized on the capacitor is proportional to the input voltage. pulse tg. By medium 1 1 and resistor 5., the voltage is lignically reduced to the voltage level of the switching threshold of Element 9, which then closes, thus terminating the formation of the output pulse. If the switching threshold voltage of logic elements 4 and .9 is zero, then t gj ,,, C tj | (, where C is a constant that is directly proportional to the magnitude of the points of current source 1 and the discharge circuit resistance (diode 11, resistor 5) .

If during time t the capacitor 2 45 does not have time to charge to a voltage level greater than the voltage of the control bus 15, then when a pulse arrives from the output of the former 6, the trigger 8 will keep the logical state O and will not form on the output clay 16 of the element 9 You have, the impulse to go.

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Thus, the OS: breeze selection is based on the duration of the input pulses. The threshold value is temporary. The selection is directly proportional to the voltage on the control bus.

The input pulse memory disconnects the current source 1 from the first capacitor plate.

The output pulse of the Former b switches to the state of logical 1 element OR 4, which causes the switch 7 to close. At the same time, the cover of the capacitor 2 is closed on the common bus and a voltage difference of positive polarity is formed on the cathode of the diode 11, which fixes element 4 in the state logical 1 after the end of the output pulse of the imager 6. Moreover, if by the time the input pulse ends, the voltage on the first plate of the capacitor 2 exceeds the voltage on the bus 14, the comparator 13 switches to the state log .1, which, when a pulsed pulse arrives at the output of the form: the user 6 at the clock input of the trigger 8, is fixed at the output of the trigger 8, 5 the pulse generated at the cathode of the diode 11 enters the device through bus 16 through the open element 9. With further discharge of the capacitor 2 through the discharge circuit, consisting

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 in series, the diode

Yes 1 1 and a resistor 5. The voltage is lignically reduced to the voltage level of the switching threshold of the Element 9, which then closes, thus terminating the formation of the output pulse. If the switching threshold voltage of logic elements 4 and .9 is zero, then t gj ,,, C tj | (, where C is a constant that is directly proportional to the magnitude of the points of current source 1 and the discharge circuit resistance (diode 11, resistor 5) .

If during time t the capacitor 2 does not have time to charge to a voltage level greater than the voltage of the control bus 15, then when a pulse arrives from the output of the former 6, the trigger 8 will keep the logical state O and you will not be formed on the output clay 16 of the element 9 -, the driving impulse.

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In this way, the OS: breezing is selected by the duration of the input pulses. The threshold value is temporary. The selection is directly proportional to the voltage on the control bus.

Claims (1)

Invention Formula 1, A linear pulse converter with duration, containing a current source, the input of which is connected to the input bus and the output with the first capacitor plate, characterized in that, in order to extend the functionality by ensuring the formation of output pulses with a duration of both longer and shorter the duration of the input pulses, a comparator, a resistor, an OR element, a pulse shaper and a key, the first of which is connected to a common bus, the second to the first capacitor lining, and the control input is with the output of the OR element, the first input of which is connected via a pulse shaper to the input bus, the first output of the resistor is connected to the inverse input of the comparator, the second output - to the second input of the OR element Editor A.Shishkin Compiled by A. Sazonov Tehred M. Morg Enthal Order 3496/56 Circulation 901 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 and the output bus, the direct input of the comparator is connected to the common bus. 2, the converter according to claim 1, characterized in that, in order to increase the noise immunity by selecting the input pulses by duration, a trigger, an additional comparator, element And, the first and second diodes and an additional resistor, and the cathode of the first diode is connected to the comparator output, between the second output of the resistor and the output of the comparator is included the second diode, the anode of which is connected to the output of the comparator, and an element I is inserted between the second output of the resistor and the output bus, the second input of which is connected to the trigger output, the clock input of which is connected to the output of the pulse former, and the information input to the output of an additional comparator, the direct input of which is connected to the first plate capacitor, and inverse - with the control bus. Proofreader L. Beskid