SU1226641A1 - Voltage-to-time interval converter - Google Patents

Abstract

The invention relates to electrical measuring technique and can be used in data conversion and processing devices. The purpose of the invention is to improve the accuracy and simplify the converter. The device contains integrators 1 and 5, analyzer 2 characters, switchable source 3 of reference voltages, electronic key 4, comparison unit 6, reset unit 7, clock pulse generator 8, triggers 9 and 10, input 11 and output 12 buses. Achieving this goal is facilitated by connecting the input bus of the converter to the input of the integrator 5. 2 Il. S (Luo 05 O5 Figure 1

Description

The invention relates to electrical measuring equipment and can be used in data conversion and processing devices.

The purpose of the invention is to improve the accuracy and simplify the converter.

FIG. 1 shows the flow chart of the proposed converter; in fig. 2 - time diagrams of the following signals: a - measured voltage; b - clock pulses in - signals at the inputs of block 6; g - signal at the output of the trigger 9; d - at the first input of source 3; e - at the output of key 4; W - at the output of the trigger 10.

The converter contains the first integrator 1, the analyzer 2 characters, the switchable source of the reference voltage 3, the electronic switch 4, the second integrator 5, the comparison unit 6, the reset unit 7, the clock pulse generator 8, the first 9 and the second 10 trigger, input bus 11, output twine 12.

In the converter, the integrator 1, the analyzer 2, the character, the switching source 3 of the reference voltages and the electronic switch 4, as well as the second integrator 5 and the comparison unit 6 are connected in series, the output of the integrator 1, the reset unit 7, is connected to the second input the output of which is connected to the control input of the second integrator 5, a generator of 8 clock pulses, the first 9 and second 10 flip-flops with a counting input, the first inputs of the flip-flops are connected to the output of the generator 8 and the second input of the source 3, and the second to the outputs of bl 7. The output of the second integrator 5 is connected to the input bus 11 of the converter and to the first input of the first integrator 1. The input of the unit 7 is connected to the output of the second trigger 10. The control input of the key 4 is connected to the output of the first trigger 9 and the output bus 12 of the converter, and the output - with the second input of the first integrator 1.

The converter works in the following way.

At time ti, a pulse arrives from the output of the generator 8 and sets the triggers 9 and 10 to the state in which the key 4 connects the negative reference voltage -UQ to the second input of the integrator 1 and the block 7 turns off. After that, the voltage at the output of the integrator 1 increases linearly with the speed

Up-ux

t where Ux is the measured voltage;

t is the integrator time constant

I and 5,

and the voltage at the output of the integrator 5 decreases linearly with the speed UX / T.

0

five

0

five

0

0

At time t2, the voltages at the outputs of integrators 1 and 5 are equal, and block 6 is activated, which in turn triggers triggers 9 and 10. Trigger 9 switches off reference voltage -Uo from the second input of integrator 1 by means of key 4 The trigger 10 includes a block 7 reset. As a result, the output voltage of the integrator 1 starts to decrease linearly with the speed Ux / r, and the voltage of the zero level is set at the output of the integrator 5. At time 1: C the clocking pulse again triggers the trigger 9 and 10, and then the cycle repeats.

When changing the sign of the input voltage, for example, at the instant of time t4, the voltage at the output of the integrator 5 starts the linear Uo + Ux but increases with speed, at the moment

time ts reaches zero level, and then linearly increases at the same speed. At time ts, analyzer 2 is triggered, thus preparing the operation of the switched source 3. With the arrival of the next clock pulse, triggers 9 and 10 and the source 3, the output of which appears voltage of the opposite sign is 4-LJ o. Then the cycle repeats.

Claims (1)

Invention Formula A voltage to time converter containing a first integrator, a first integrator, a sign analyzer and a source of reference voltages, a second integrator and a comparison unit connected in series with the input bus of the converter; the output of the first integrator, the reset unit, whose output is connected to the control unit, are connected to the second input input of the second integrator, the electronic key, the signal input of which is connected to the output of the source of reference voltages, and the output to the second input of the first integrator, the generation op clock pulses and two flip-flops, the first inputs of which are connected to the output of the clock generator and the second input of the source of reference voltages, and the second to the output of the comparator, the output of the first flip-flop connected to the output bus of the electronic key, and The output of the flip-flop trigger is connected to the input of the reset unit, characterized in that, in order to increase the accuracy and simplify the converter, the input bus of the converter in it is connected to the input of the second terminal. , rf Ftth r Well N n f