SU993289A1 - Pulse-width function generator - Google Patents

Description

The invention relates to automation and computing, in particular, to devices of a non-linear converter of information specified in the form of a duration of rectangular pulses. A functional converter is known that contains functional argument converters, decoupling amplifiers, controlled voltage dividers, unbalance voltage amplifiers, reference voltage source and output controlled oscillator 1. The disadvantage of the converter is the clear accuracy of the conversion of the argument presented in. pulse-width form, due to the drift of the zero voltage unbalance amplifier. A pulse-width functional converter is also known, which contains a controlled voltage divider, a decoupling amplifier, fillers, an unbalance voltage amplifier, and an output controlled oscillator 2 The disadvantages of this converter are the limited functionality and reduced accuracy due to the drift zero of the voltage amplifier married unbalance. The prototype of the invention is a pulse-width functional converter containing two polynomial converters of relative pulse duration, the first of which is connected by a signal input to the input of a pulse-width signal, and the second is connected to the output of the first input of an unbalance voltage amplifier connected by a second input to the output of the first control The divider of the first voltage connected to the control input with the output of the controlled oscillator and the control input of the second controlled divider connected to the zero-potential bus signal input and to the reference inputs of a polar pulse converter of relative pulse duration, and the output to the output of the first polynomial converter of relative power of pulses and to the second input of an unbalance voltage amplifier connected to the nepBtavi input via a constant resistor to the output source the reference voltage and to the signal input of the first controlled voltage divider, and the signal input of the second polynomial driver relative to a significant pulse duration is connected to the input of a pulse-width signal 3J. The disadvantage of the prototype is also the reduced accuracy of the functional transformation; The purpose of the invention is to improve the accuracy of a functional transducer. For this purpose, a pulse width functional transducer contains two polynomial transducers of relative pulse widths, the first of which is connected by a signal input to the input of a pulse width signal, and the second is connected to the first input of a voltage amplifier. imbalance connected by the second input to the output of the first controlled voltage divider connected by the control input with the output of the output signal generator and with the control input of the second controlled voltage divider, additionally introduced amplifiers, switches, amplitude rectifiers and a subtractor connected by an output to the input of the output shaper, and inputs to the outputs of the first and second amplitude rectifiers connected by inputs respectively the outputs of the first and second keys connected by the signal inputs to the unbalance voltage amplifier in the controller, and the control / and inputs to the input of the pulse-width signal and to the signal input of the second controlled divider The voltage connected by the output through the first decoupling amplifier to the signal input of the second polynomial: a converter of relative pulse duration, the output of the first polynomial converter of the relative duration of the pulses connected via the second uncoupling amplifier to the signal input of the first controlled voltage divider. In addition, each polynomial transducer of the relative pulse duration contains a summator and a group of series-connected linear transducers of the pulse duration into their amplitude, the first of which is connected to the signal input of the polynomial transducer of the relative pulse duration and to the first input of the adder connected to the remaining inputs with the outputs of linear devices of the pulse duration in their amplitude, and the output with the output of the polynomial transform of the bodies relate the total duration of the pulses. In addition, each linear pulse width converter in their amplitude contains a decoupling amplifier, a half-wave rectifier and a high-pass filter, whose input is the input of a linear pulse-width converter in their amplitude, and the outlet is connected through a half-wave rectifier to the input of the decoupling amplifier, the output of which is the output of a linear converter of the duration of the pulses into their amplitude. ; FIG. 1 is a block diagram of a 1-pulse idle functional converter L in FIG. 2 - block scheme of the polynomial transducer of the relative pulse duration. Pulse width functional converter .. 1), contains the first and second / hinomial converters 1 and 2 of the relative pulse duration, the first and second controlled voltage dividers 3 and 4, the first and second isolating amplifiers 5 and b, the amplifier 7 eg imbalance, first and second keys 8 and 9, first and second amplitude rectifiers 10 and 11, Subtractor 12 and output driver 13. The first polynomix converter 1 is connected by a signal input to the input of a pulse-width signal, a signal input of the second divider 4 and the control inputs of keys 8 and 9, and an output through the second decoupling amplifier b with a signal input of the first divider 3 connected to the control output of the driver 13 and to the control input of the second divider 4. The output of divider 4 is connected via the first decoupling amplifier 5 to the signal input of the second polynomial converter 2 connected by an output to the first input of the amplifier 7 unbalance voltage. The amplifier 7 is connected to the second input to the output of the first divider 3, and the output to the signal inputs of keys 8 and 9. The input of the imager 13 is connected to the output of the subtractor 12 connected by inputs to the outputs of the first and second amplitude rectifiers 10 and 11 connected by inputs respectively to the outputs of the first and second keys 8 and 9. Each polynomial transform. The transmitter 1 and 2 of the relative pulse duration can be executed, for example, containing (Fig. 2) a group of series-connected linear transducers 14-16 of the pulse duration into their amplitude and adder 17. The first of the linear transducers 14 is connected by input to the signal input of a polynomial

the converter and to the first input of cyMTijaTopa 17, connected by other inputs to the outputs of linear converters 14 - 16, and the output to the output of a polynomial converter. In addition, polynomial converters may contain inverters 18-21 (Fig. 2), the first of which is turned on by the signal input of the polynomial converter and the first input of the adder 17, and the rest are connected between the outputs of all linear converters (except for the last linear converter 16 ) and the corresponding inputs of the adder 17.

Each linear transducer. The pulses in their amplitude: can be filled ,. for example, containing (FIG. 2) a high pass filter 22, a half-wave rectifier 23 and a switching amplifier. 24. The input of the filter 22 is a linear input of the linear converter, and the output of the filter 22 is connected via a full-wave rectifier 23 to an input of the isolation amplifier 24, the output of which is the output of the linear converter.

Pulse width functional converter works as follows.

The input voltage used as the voltage supply of the bridge circuit (formed by nodes 1-b) has the form of rectangular pulses of duration t / following a period T. The output voltages U and UQ of the converters 1 and 2 are repeated in shape the input width pulsed. signal, but have amplitudes U x and, depending on certain laws F on the relative Duration 0 T / T of the input pulses,

UX4 mi), where V. is the amplitude of the pulses on,

i-ro converter i 1,2.

When the relative duration of the shshuls of the input signal changes at the inputs of the amplifier 7, a pulse voltage of the bridge circuit voltage with amplitude UXiT occurs where Uy is the amplitude of the pulse voltage at the controlled output. divider 3. This pulse voltage amplified by the driver 7, using elements 8-12, is converted into the value of the constant voltage of the formating gate 13. Keys B and 9 divide the output signal of amplifier 7 into pulses corresponding in time to the pulses and pauses of the input pulse width signal. At the outputs of the amplitude rectifiers 10 and 11, constant voltages are generated,. corresponding in magnitude and polarity to the amplitudes of the pulses at their inputs. These constant voltages are fed to the inputs of the reader1 12, at the output of which a dc current accumulation is formed, proportional to the magnitude of the full swing of the amplified pulsed imbalance and corresponding to its polarity regardless of the zero drift. amplifier 7. The output voltage of the subtractor 12 affects the output signal shaper 13 by changing the value.X of the output parameter of the output signal so thatSry to restore the bridge equilibrium, characterized by equality of the voltages at the inputs of the amplifier 7. As a result, the characteristic of the pulse width functional converter will be determined what is your expression ..

ChaMrav)

) their; - functional characteristics of the first and second omitted divisors. 3 and 4, respectively. .

As a parameter x of the output signal of the imaging unit 13, a digital code or a machined signal can be used.

movement, while forming-. Rover 13 must be adequately made in the form of a controlled digital code generator or an executive engine, and controlled

voltage dividers - in the form of code converters - voltage or potentiometers. In addition, as the output parameter x, the duration of rectangular can be used.

pulses with a frequency that is hundreds of times higher than the frequency of the input pulses, for which the imaging unit 13 must be made in the form of a rectangular generator

pulses of controlled duration with the required frequency. At the same time, pulsed voltage dividers can be used as controllable voltage dividers, the inputs of which receive the voltage of the pulses / followers with a frequency much lower than the tracking frequency of the control (output) pulses, so that the input pulse voltages of the pulsed voltage dividers for them, they are quasi-constant and play the role of their reference stresses. Polynomial converters. 1 and 2 of the relative duration of the pulses are as follows.

Each linear transducer of the pulse duration in their amplitude receives a sequence of unipolar voltage pulses, similar to the input signal.

Claims (3)

The high-pass filter 22 does not allow a constant component of this pulse sequence, as a result of which a two-pole pulse process takes place at the filter output, in which the amplitudes of positive and negative pulses are responsibly equal: u ;; - uJ --uO-0 ;, - ig ,,: where U | - the amplitude of the input pulses of the linear transducer of the pulse duration in their amplitude. The dependence of the amplitudes U and and on the relative duration of the pulses is used to obtain a conversion of the relative duration of the pulses to their amplitude. The half-wave rectifier 23 transmits only pulses of one polarity. Therefore, a unipolar pulse process is restored at its output, but the amplitude of the pulses at the output of the rectifier depends on the value of & The input signal of this linear converter in the corresponding HII is one of the given dependences, and the decoupling amplifier 24: serves to match the output of the rectifier with the input of the subsequent linear converters of the pulse duration into their amplitude or voltage unbalance amplifier. Accordingly, for converter 1 or 2, containing only m series-connected linear converters 14–16 (without adder 17) pulse durations in their amplitude, where in a linear current converter, a rectifier 23 transmits pulses of the same polarity, the characteristic of a polynomial the inverter will have the form (b) - (- b)) In the full scheme of the converters 1 and 2 (including adders 17), the conversion characteristic of the relative duration of pulses into amplitude will have the form) -N) (1-0) F ( 0) - () 0, where p O dl c lagging, defining signals supplied to the inputs of the adder 17 directly; 1 for the terms defining the signals applied to the inputs of the adder 17 through the inverters. This causes wide possibilities for obtaining characteristics. transformations implemented by converters 1 and 2 in the form of various non-linear functional dependencies using a polynomial approximation, and in the scheme of the proposed converter as a whole in accordance with the above expression for. its conversion characteristics also provide the possibility of approximating the given nonlinear conversion functions of the relative duration of rectangular pulses 9 into the fractionally rational / 1 parameter x by approximation of both the directly specified function and the function inverse to the specified one. The proposed converter provides the possibility of converting information with increased, as compared with the prototype, accuracy achieved by introducing into the device circuit the nodes eliminating the influence of the voltage amplifier unbalance on the conversion results, which determines its technical and economic advantages. Claim 1. Pulse Width A functional converter containing two polynomial converters of relative pulse duration, the first of which is connected by a signal input to the input of a pulse-width signal, and the second is connected to the output of the first input of the unbalance voltage amplifier connected by the second input to the output of the first controlled voltage divider connected to the control input with the output of the output driver and with the control input of the second controlled divider Moreover, in order to increase the accuracy of the functional transformation, additional amplifiers, switches, I amplitude rectifiers and a subtractor connected by an output to the input of the output output frontier, and inputs to the outputs of the first and second amplitude rectifiers are additionally introduced into it. connected to the outputs of the first and second switches connected by the signal inputs to the output of the imbalance voltage detector, and the control inputs to the input of the pulse width signal and to the signal input of the second controllable voltage divider is connected via a first vyholyum decoupling yciJflitel to the signal input vtorogb polynomial transducer relative pulse duration, the output of the first transducer relative polynomial pulse duration is connected via second decoupling amplifier to the signal input of the first controllable voltage divider. 2. The converter according to claim 1, that is to say that each polynomial converter of relative pulse duration contains an adder and a group of series-connected linear converters of pulse duration into their amplitude, the first of which is connected to the signal input of the polynomial converter the relative pulse duration and to the first input of the adder, connected by the remaining inputs to the outputs of linear transducers of the duration of the shAtuls to their amplitude, and the output from the output m polynomial converter of the relative pulse duration. 3. Converter on PP. 1 and 2, characterized in that each linear transducer of the pulse duration into their amplitude contains a separate amplifier, half-wave rectifier and high-pass filter, the input of which is the input of a linear converter of the pulse duration to their amplitude and the output connected. through a half-wave rectifier with the input of the amplifier, the output of which is the output of the linear converter of the duration of the pulses into their beat. : Information sources, taken into account during the examination 1 1. USSR inventor's certificate 736122, cl. G 06 G 7/16, 1976. 2. The author's certificate of the USSR 665377, cl. H 02 M 5/16, 1976. 3.Smolov V.B. Functional converters of inertia L., Energoizdat, 1981, p. 2 03-204, fig. 5-26 (prototype}.