SU974578A1 - Voltage effective value-to-time interval converter - Google Patents

Description

(54) CONVERTER OF ACTIVE VALUE OF VOLTAGE IN TIME INTERVAL

The proposed device relates to electrical measuring and computing techniques and can be used to create measuring instruments for an actual value of a voltage of an arbitrary shape in a wide frequency range.

A known converter of an effective voltage value into a time interval consisting of a rectifier, a comparison device, two keys, a reference voltage generator, two AND logic circuits, and a control flj trigger.

However, this transducer has low accuracy and limited frequency range.

The closest in technical essence to the present invention is the converter of the effective voltage value during the pulse following period, the block diagram of which contains a rectifier, the input of which is connected with the input source, and the output with one of the limiter inputs and the first input of the integrator, the second input which is connected to the output of the limiter, and the third to the output of the generator compensating for the voltage, comparing.

the device, whose input is connected to the integrator output, and the output to the input of the reference voltage generator, the output of the latter is connected to another input of the limiter and the input of the compensating voltage generator f2J

This converter performs simultaneous comparison of continuously incoming information.

10 on input signal with compensating voltage. To perform the converter accurately, it is necessary when changing the amplitude or shape of the input signal. (T) to change the ratio between the coefficients of the reference and compensating voltages. Since such an operation is not provided for in this converter, then, naturally, a substance arises.

conversion error.

In addition, the presence of a booster at the input, as well as the need to carry out all subsequent operations on the input voltage, limits the frequency range of the converter in question.

The purpose of the invention is to improve the accuracy and expansion of the frequency range of the transducer.

Claims (2)

30 times the voltage per time interval. . The goal is achieved by the fact that a second and third matching devices, an OR gate, a voltage to current converter, a switch and a control device are inserted into the converter containing the serially connected integrator and the first comparator device, the reference voltage generator, and the input bus is connected to the first inputs of the second and third of its comparison devices, the second inputs of which are connected to the outputs of the reference voltage generator, and the outputs via an OR gate to the control input of the CL With the first input of the control unit, the second input of which is connected to the output of the first comparison device, and the output to the control input of the reference voltage generator, the output of which is connected to the integrator input through a voltage to current converter and a switch. FIG. 1 shows a block diagram of a converter; FIG. 2 time diagrams of voltages, according to the principle of operation of the converter, the circuit contains comparing devices 1 and 2, generator 3 of the reference voltage, logic element 4 OR converter 5. voltage to current, key b, control device 7, integrator 8, comparing device 9, the output of the integrator 8 is connected to the input of the comparison device 9, the input is connected to the first inputs of the comparison device 1 and 2, the second inputs of which are connected to the outputs of the generator 3 of the reference voltage, and the outputs through a logic element 4 OR with the control input of the key 6 and the first input of the control device 7, the second input of the latter is connected to the output of the comparison device 9, and the output to the control input of the generator 3 of the reference voltage, while the input of the voltage converter 5 is connected to the output of the generator 3 of the reference voltage, and the output through the key 6 with the input of the integrator 8 .. The converter works as follows. The input voltage Uj ft nocTynaeT to the first inputs comparing device 1 and 2. The second inputs of these comparing devices are connected to a positive linearly varying voltage U (t) and a negative fUy; (t). During the time intervals with, - (fig.2a), allocated by comparing devices, the integrator 8 integrates the current); where K is the conversion factor of the voltage-to-current converter 5. Voltage U "n (Fig. 2b) the output of the integrator 8 for the time interval T, the duration of which determines; SY from the condition U c (t) | M T, |, GDV, the amplitude value Ux (t) ci tangent of the angle of voltage U . (t), will be equal and in) - “I and ,, (t) V J5igv, ux lt) -u,, (t) I at, where H 1-K / big-HtU tt) -UnJ.- t) 3H,. .g-nCUicW-UKlt) -. When the time interval T expires, a current i - kUk,;. The voltage on the integrator 8 decreases in accordance with the expression J,) - Uiilt,) - jkU |, (;) dъ The time instant corresponding to the zero voltage on the integrator 8 is fixed by the comparator device 9. Next, the entire conversion cycle is repeated. Hence the equation characterizing the operation of the converter. (Bu, (t)) at - ii uK, wat. Solving this equation for T, we get V-Kv, Vy, where Kj is the conversion factor / W. is the effective value of the input voltage. Lz of the formula shows that the time interval T, j is proportional to the effective value of the input voltage. The introduction of new nodes and connections, as well as a change in the operation algorithm, can significantly improve the accuracy of the conversion and expand the frequency range of the converter. Conversion accuracy is improved due to, firstly, the exclusion of the rectifier at the converter input, secondly, the use of the same nodes for obtaining information about the transformed input voltage parameter and for the compensation mode of the same nodes, and thirdly, the introduction of a multidirectional comparison. not- . the need for adjusting the reference voltage to changing input. The expansion of the frequency range is achieved by the fact that in all conversions related to switching and integration, a current is used that allows a significant increase in the speed of all the nodes of the preformer. The current value in this circuit can choose the outcome only from the optimal operation mode of the elements of a particular implementation and not related to the input voltage range. In addition, the input voltage is subjected to only one operation — a comparison that is as short as possible in terms of time. Claims of an Inverter Actual Voltage to a Time Interval containing a sequentially connected integrator and a first comparison device, a voltage generator, characterized in that, in order to increase the accuracy of the conversion and expand the frequency range, a second and third comparing devices, OR logic unit, voltage-to-current converter, switch and control device, with the input bus connected to the first inputs of the second and third comparing devices The second inputs of which are connected to the outputs of the reference voltage generator, and the outputs via an OR gate are connected to the control input of the key and the first input of the control device, the second input of which is connected to the output of the first comparison device, and the output to the control input of the reference generator. voltage, the output of which is through a voltage to current converter and the key is connected to the input of the integrator. . Sources of information taken into account during the examination 1. USSR author's certificate No. 213971, cl. H 03 K 13/20, 1968. 2. USSR author's certificate number 534865, cl. H 03 K 13/20, 1976, (prototype).