SU960848A1 - Device for determination of voltage modulus sum - Google Patents

Description

(5) DEVICE FOR DETERMINING THE VALUE OF VOLTAGE MODULES

one

The invention relates to computing and information-measuring equipment and can be used in systems for monitoring the parameters of the modes of electric power networks to determine the sum of the modules of electrical energy. signals.

The amplitude voltage pulse selector is known, which contains threshold elements, an OR element with dynamic inputs, a level distributor, an NOT element, and a time delay element of signal 1,

A disadvantage of this device is its narrow functionality (applicability only for decoding the amplitude value of incoming voltage pulses at the device input).

Closest to the present invention is a static voltage amplitude analyzer containing an amplitude selector, OR elements with dynamic inputs, a trigger, a one-shot, And elements, and trigger pulse counters 2.

A disadvantage of the known device is its considerable complexity.

The aim of the invention is to simplify the device.

Claims (2)

The goal is achieved by the fact that the device for determining the sum of voltage modules containing an analog-digital converter, one novibrator, a pulse counter, D-triggers, elements EXCLUSIVE OR, AND-NO, NOT, and the outputs of the analog-digital converter are respectively connected with the first inputs of the D-flip-flops and the first inputs of the EXCLUSIVE OR elements, the second inputs of the D-flip-flops are connected to the output of the element NOT, the second inputs of the elements EXCLUSIVE OR are connected respectively to the outputs of the D-triggers, and the outputs cops XOR. connected to the inputs of the NAND element, the output of which is connected to the input of a single-to-vibrator, the output of which is connected to the inputs of the pulse counter and the element NOT, the input of the device is the input of the analog-to-digital converter. Figure 1 shows a schematic of the device for determining the sum of voltage modules; in fig. 2 is a graph illustrating the operation of the device. The device contains an analog-to-digital converter (ADC) 1, D-flip-flops 2, the elements EXCLUSIVE OR 3, the elements AND-NOT 4, the one-shot 5, the element NOT 6 and the counter 7 pulses. The device works as follows. The analog value of the voltage applied to the input of the A / D converter 1 is converted into binary numbers at its outputs. AT . The device uses an A / D converter 1 of the parallel principle of operation, the sequential change of the code on the outputs of which occurs only after the input voltage changes to the reference of the least significant bit 4U. In static mode, the number available at the outputs of ADC 1 is in a memory device made on D-flip-flops 2. For example, at time t (Fig. 2) the output of ADC 1 has the number 0000. This% e number is stored in D - triggers 2, on the inverse outputs of which it is represented as 1111. Consequently, the inputs of each of the elements EXCLUSIVE OR 3 are given different signals. At the outputs of all the elements EXCEPTIVE OR 3, there is a single voltage, and at the output of the element AND NOT C - zero. In the course of its change, the voltage under investigation U stops the boundary of the first discharge (point 1, Fig. 2), which leads to the operation of the A / D converter 1: at its outputs, the number 0001 appears. Since the same single signals are applied to the inputs of the EXCLUSIVE OR element 3 of the first discharge, a zero voltage appears at its output, and the output of the AND –HE element k is equal to one. This voltage triggers a single-oscillator 5, at the output of which a single pulse appears, counted by a pulse counter 7. After the end of the one-shot 5 pulse, the D-triggers 2 write down the number 0001 on the leading edge of the voltage from the output of the NOT 6 element, resulting in 84 resulting in the output voltage of all the EXCLUSIVE OR elements becoming single again and the NAND element becoming zero. A similar operation is repeated at all points of the transition by the investigated voltage across the boundaries of the ADC bits 1 (points 2, 3, 4, etc., Fig. 2). At the end of the measurement, which lasts time T, the total change in voltage W N-li is determined, (1) de W is the total change (variation) of the voltage; . N - the contents of the counter 7 pulse, ow; and is the value of the least significant bit. The technical and economic efficiency of the invention lies in its structural simplicity and, consequently, higher reliability. For the implementation of the proposed device, it is required almost 5 times less than for the known, most expensive elements - integral circuits. Apparatus of the Invention A device for determining the sum of voltage modules, comprising an analog-digital converter, a one-shot, a pulse counter, characterized in that, in order to simplify the device, D-triggers are inserted into it, the elements EXCLUSIVE OR, AND-NO, NOT, and the outputs the analog-digital converter is respectively connected to the first inputs of the D-flip-flops and the first inputs of the EXCLUSIVE OR elements, the second inputs of the D-flip-flops are connected to the output of the NOT element, the second inputs of the EXCLUSIVE OR elements are connected respectively to the outputs of the D-flip-flops, and the outputs of the EXPLUSIVE OR elements are connected to the inputs of the NAND element, the output of which is connected to the input of the one-oscillator, the output of which is connected to the inputs of the pulse counter and the element, the device input is the input of the analog-digital converter. Sources of information taken into account during the examination 1. USSR author's certificate f 600725, cl. H 03 K 13/175. 1975. 2. USSR author's certificate according to the application N 27 2920 / 18-21, cl. G 01 R 23/16, 1979 (prototype). Fig, 1 one one 1