SU1160445A1 - Pulse-position square-law function generator - Google Patents

Abstract

TIME-PULSE SQUARE CONVERTER containing a smoothing link, the output of which is the output of the converter, three large-scale resistors smoothing capacitor, two switches, a phase inverter and a pulse-width modulator, information and reference inputs of which are average. the information input of the converter and the output of the negative polarity reference voltage source, the output of the positive polarity reference voltage source is connected through the first large-scale resistor, two switches and the second large-scale resistor to the first output of the third large-scale resistor, the common output of the first and the second switch is connected via a smoothing capacitor to the zero-potential bus, the output of the pulse-width modulator is connected to the control input the first key and through the phase inverter to the control input (L of the second, characterized in that, in order to increase accuracy, a fourth large-scale resistor is introduced in it, the first and second terminals of which are connected respectively to the information input of the converter and the input of the smoothing link, the second output The third scale resistor is connected to the output Oi of the positive-voltage reference source. 4 4 SP

Description

The invention relates to computer technology and may be used as a functional unit in information and measurement systems in computer control complexes. The time-pulse quadratic converter is known, which contains a sawtooth generator, a comparator, a clock-resistance generator and a clock generator: STI: One less link Sone the rest of this device is low accuracy due to the dependence of the conversion result on the slope of the saw voltage and low reliability. The closest in technical essence to the proposed is a time-pulse quadratic converter containing a smoothing link, the output of which is the output of the converter, three large-scale resistors, a smoothing capacitor, two keys, a phase-inverter and a pulse-width pulse modulator, information and reference inputs of which are connected respectively to the information input of the converter and the output of the source of the reference voltage of negative polarity, the output of the source of the reference voltage of the positive field p Spikes through serially connected first scale resistor, two keys and a second scale resistor are connected to the input of the smoothing link and to the first output of the third scale resistor, communities of the first and second keys through a smoothing capacitor connected to the zero potential bus, output pulse width modulator connected to the control input of the first key and through a phase-inverter to the control input of the second key 2. A disadvantage of the known device is the low conversion accuracy. The purpose of the invention is to increase accuracy. This goal is achieved by the fact that in a time-square pulse converter containing a smoothing element whose output is the output of a converter, three large-scale resistors, a smoothing capacitor, two switches, a phase inverter, and a pulse-width modulator. the information and reference inputs of which are connected respectively to the information input of the converter and the output of the source of the reference voltage of negative polarity, the output of the source of the reference voltage of positive polarity through a series-connected first resistor, two switches and a second large-scale resistor are connected to the input of the smoothing link and to the first output of the third scale resistor, the common output of the first and second keys is connected via a smoothing capacitor to the zero-potential bus, the output of the pulse-width modulator is connected to the control input of the first key and through the phase inverter to the control input of the second key, the fourth scale resistor is inputted, the first and second terminals of which are connected to the information input of the converter and the second output of the third scale a resistor is connected to the output of a positive polarity reference voltage source. The drawing shows a functional diagram of the proposed device. The time-square pulse converter contains smoothing link 1, smoothing capacitor 2, two switches 3 and 4, four large-scale resistors 5-8, phase inverter 9, negative polarity source 10, negative polarity reference source 11 No. 1 pulse modulator 12. The time-pulse quadratic converter operates as follows. The input voltage using a pulse-width modulator of torus 12 is linearly converted to a relative duration of 0. Thus, the average value the conductivity of the chain of series-connected first scale resistor, two keys and the second scale resistor is equal to 006, (.1-6}. i, i. output voltage U2 is equal to .e ..,, where Gj and G are the conductivities of the third and fourth scaled f5 resistors, $ to 54 Based on the correspondence of the expression (3) to the expression, - О51в95х (1-к1 R; (xH0.00004y-f0 . 1.70 to V approximating a magnitude dependence with a reduced error f not higher than 0.01% in the range of X from 0 to 1, select the values of the conductivity of the third and fourth scale resistors, which provide a logarithmic transformation of the input voltage. The advantage of the proposed device is the high conversion accuracy resulting from the principle of averaging the width-modulated parameters.

B

17

I

F

12

eight

tft

h-o

Claims (1)

TIME-PULSE QUADRATIC CONVERTER containing a smoothing link, the output of which is the output of the converter, three scale resistors, a smoothing capacitor, two keys, a phase inverter and a pulse-width modulator, the information and reference inputs of which are connected respectively to. the information input of the converter and the output of the voltage source of negative polarity, the output of the voltage source of positive polarity through a series-connected first scale resistor, two keys and a second scale resistor connected to the input of the smoothing link and to the first output of the third scale resistor, the common output of the first and second keys through the smoothing capacitor is connected to the bus of zero potential, the output of the pulse-width modulator is connected to the control input of the first second key and through a phase inverter - to the control input of the second key, characterized in that, in order to increase accuracy, a fourth scale resistor is inserted into it, the first and second outputs of which are connected respectively to the information input of the converter and the input of the smoothing link, the second output of the third scale a resistor is connected to the output of a positive polarity reference voltage source. > 1 1 160445 2.