SU1141426A1 - Pulse-position square-law function generator - Google Patents

Abstract

TIME-PULSE SQUARE CONVERTER, containing the first and second pulse-controlled voltage dividers, the outputs of which are; . connected to the input of the smoothing link, the output of which is the output of the converter, the source of the reference voltage connected to the information input of the first impulse-controlled voltage divider, the control input of which is the input of the converter, the information input of the second pulse-controlled voltage divider connected to the conversion code: the body, the first pulse-controlled voltage divider contains a series-connected key and two large-scale resistors, the total of which through the sl alive capacitor is connected to zero potential bus, and the data and control inputs are kitsy key information, respectively, and the control inputs of the first pulse-controlled divider. voltage, the second pulse-controlled voltage divider contains the key to two large-scale resistors, the first terminals of which are combined and through a smoothing capacitor connected to the zero potential terminal, and the second output of the second large-scale resistor is the output of the second pulse-controlled voltage divider, A control input of which is connected to a control to a key input, characterized in that, in order to increase the conversion accuracy, a second voltage divider is inserted into the first pulse-control (D C key and the third scale resistor, the first and second terminals of which are connected respectively to the common terminal of the first and second scale edges of the first pulse-controlled voltage divider and to the pin, zero potential, the free terminal of the second scale resistor is connected to the key input, the output of which is the output of the first pulse-controlled voltage divider, the control inputs of the first and second keys are combined, and the third large-scale resistor is introduced into the second impulse-controlled voltage divider, the first Its output is connected to the first terminals of the first and second scale resistors, and the second output of the third scale resistor is connected via a switch to the zero potential bus, the second terminal of the first scale resistor is the information input of the second pulse-controlled voltage divider.

Description

The sixth decade relates to analog computing technology and can also be used in information-measuring technology. The dependence of the output voltage V2 of the proposed device on the relative duration of the input ShIM signal 0 and the signal constant. ka V-has the form V, -V, Qt where 0 / t P is the duration of rectangular pulses repeated with a period T; VQ is the direct voltage reference voltage. It is known a device containing an operational amplifier with a smoothing feedback circuit, in the input circuit of which there are two series-connected pulse-controlled resistors, whose common point is connected to a zero potential bus through a smoothing capacitor, and through which the source of the negative polarity is connected to the input of the operational amplifier, implemented along with the quadratic conversion operator of the relative duration of the PWM signal dneni ij. However, the device has a low accuracy of converting the input pulse-width signal by a trigonometric dependence, due to a significant methodical error when used as an approximation of a second-order polynomial. The closest in technical essence of the present invention is a time-pulse quadratic converter containing a Lervy and a second pulse-controlled voltage dividers, the outputs of which are connected to the input of a smoothing link whose output is the output of the converter, the source of Olor voltage, connected to the information input of the first pulse-controlled voltage divider, the control input of which is the converter input, the information input of the second pulse-controlled the voltage divider is connected to the output of the converter; the first pulse-connected voltage divider contains in series the connected key and two large-scale resistors, the common output of which is connected to the coolant potential bus through the smoothing capacitor, and the information and control inputs of the key are respectively, the information and control inputs of the first pulse-controlled voltage divider, the second pulse-controlled voltage divider contains a key and two large-scale ones; resistors, the first outputs of which are combined and through a smoothing capacitor are connected to a zero-potential bus, and the second output of the second large-scale resistor is the output of a pulse-controlled voltage divider, the control input of which is connected to the control input of key 2. The disadvantage of the converter: is the low accuracy of reproduction of the quadratic dependence of the output voltage on the relative duration of the input s-modulated signal. The purpose of the invention is to increase the accuracy of the conversion. The goal is achieved by the fact that during a time-square pulse converter containing first and second pulse-controlled voltage dividers, the outputs of which are connected to the input of a smoothing element whose output is the output of the converter, the reference voltage source connected to the information input of the first a pulse-controlled voltage divider, the control input of which is the converter input, the information input of the second pulse-controlled voltage divider is connected to the output in the converter, the first pulse-controlled voltage divider contains sequentially connected key and two large-scale resistors, the common output of which is connected to the zero-potential bus through a smoothing capacitor, and the information and control inputs of the key are respectively the inputs of a pulse-controlled voltage divider, the second pulse-controlled voltage divider contains a key and two large-scale resistors, the first outputs of which are combined and through smoothing the cond The sensor is connected to the zero potential bus, and the second output of the scale resistor is the output of the second pulse-controlled voltage divider, the control input of which is connected to the control input of the key, the second key and the third scale are entered into the first pulse-controlled voltage divider a resistor, the first and second terminals of which are connected respectively to the common terminal of the first and second large-scale resistors of the first pulse-controlled voltage divider and to js of zero potential, the free terminal of the second The scale resistor is connected to the key input, the output of which is the output of the first pulse-controlled voltage divider, the control inputs of the first and second keys are combined, and the third scale resistor is inserted into the second pulse-controlled voltage divider, the first view of which is connected to the first outputs of the first and second large-scale resistors, and the second output of the third large-scale resistor is connected via a switch to the zero potential bus; the second output of the first large-scale resistor is informational input om second. pulse-controlled voltage divider.

The drawing shows the functional diagram of the Converter.

The time-square pulse converter contains a smoothing link 1, two 2- and 3 pulse-controlled voltage dividers, three 4-6 scale resistors, two switches 7 and 8, and a smoothing capacitor 9 of the first pulse-controlled voltage divider, three 10 - 12 scale resistors, a switch 13 and a smoothing capacitor 14 of the second pulse-controlled voltage divider, and a reference voltage source 15.

The Converter operates as follows.

The condition of the dynamic equilibrium of the circuit is

1, H.U.)

here, 1.5 12, respectively, the average values of the currents coming from the first 2 and second pulse-controlled voltage dividers to the input of the smoothing link 1. A ground-modulated signal with a relative duration of 0 controls the average values of the conductivities of the pulse-controlled voltage dividers. Smoothing capacitors 9 and 14 provide for alternating current separation of the corresponding pulse-controlled voltage dividers. Taking into account the linear law of control of the average conductivity values of the pulse-controlled voltage dividers and assuming a potential copy of the input of the smoothing link 1, we have

 Gv02

0

(3) 1 + 29

This expression is valid when

 Gj

G Gf, where G4, G j and G are the conductivities of the scale resistors 4-6 of the first pulse-controlled voltage divider 2.

The average value of the current Ig will be

magnitude

0.5 G

I, V (4)

1 + 20

This expression is valid when G.Q

 4Gj (where

G.

C, 4I

 G G and

12

G, are, respectively, the conductivity values of the scale resistors 1012 of the pulse-controlled voltage divider 3.

Taking into account the condition of dynamic equilibrium of the scheme (2) and putting G, O, 5 G-.

which corresponds to (1).

The advantage of the proposed device in comparison with the known is the higher accuracy of the quadratic conversion of the relative duration of the input width-modulated signal into the output DC voltage.

Claims (1)

No. 296119, Kn.G06 G 7 / 22.1971 (prototype). 'TIME-PULSE QUADRATIC CONVERTER containing the first and second pulse-controlled voltage dividers, the outputs of which:. connected to the input of the smoothing link, the output of which is the output of the converter, a reference voltage source connected to the information input of the first pulse-controlled voltage divider, the control input of which is the input of the converter, the information input of the second pulse-controlled voltage divider is connected to the output of the converter, the first pulse the controlled voltage divider contains a series-connected key and two large-scale resistors, the general output of which is through a smoothing the capacitor is connected to the bus of zero potential, and the information and control inputs of the key are respectively the information and control inputs of the first pulse-controlled divider. voltage, the second pulse-controlled voltage divider contains a key and two scale resistors, the first conclusions of which are combined and connected to the zero potential bus through a smoothing capacitor, and the second output of the second scale resistor is the output of the second pulse-controlled voltage divider, the control input of which is connected to the control key input, characterized in that, in order to increase the accuracy of transform _Λ mations, the first pulse-S manageability introduced my voltage divider the second switch and third m a large-scale resistor, the first and second conclusions of which are connected respectively to the common terminal of the first and second large-scale resistors of the first pulse-controlled voltage divider and to the bus. zero potential, the free output of the second scale resistor is connected to the key input, the output of which is the output of the first pulse-controlled voltage divider, the control inputs of the first and second switches are combined, and the third scale resistor is introduced into the second pulse-controlled voltage divider, the first output of which is connected to the first the conclusions of the first and second scale resistors, and the second output of the third scale resistor through a key is connected to the zero \ potential bus, the second output of the first scale th resistor is an information input of the second pulse-controlled voltage divider.