SU983560A1 - Device for measuring ac voltage amplitude drops - Google Patents

Description

(5) DEVICE FOR MEASURING DIFFERENT VARIABLE VOLTAGE AMPLITUDE

one

The invention relates to electrical measuring technology and can be used in the construction of amplitude analyzers.

Apparatus for measuring the amplitude amplitude of an alternating voltage, comprising a comparison circuit, a serially connected pulse counter and a digital-to-analog converter, a serially connected Q reference frequency generator, a frequency divider and a discrete differentiator, the serially connected circuit And and the key connected in parallel to the input of the comparison circuit 5 is a peak detector and an adder, the inputs of which are connected to a switch connected to a discrete differentiator, the output of discrete differentials At the same time, the controller is connected simultaneously to the switch, the peak detector, the circuit AND and the additionally entered register, the inputs of which are connected to the outputs of the counter, and the outputs of the reference frequency generator, the digital-to-anap converter, the comparison circuit and the key are connected respectively to the control input of the key, the adder , And scheme and pulse counter f1J.

The disadvantage of these devices is their relative complexity, the presence of a digital-to-analog converter, which leads to a complication of the design, to a decrease in speed and the appearance of additional error. In addition, the devices do not allow measuring voltage drops from minimum to maximum and vice versa at the same time.

The closest technical solution to the invention is a device for measuring the amplitudes of the alternating voltage, containing two peak-detectors, a differential amplifier and a voltage level clamp C 23. However, at the output of this device the value of the measured parameter is obtained as an analog signal (eg in the case of digital processing or display, requires additional conversion. The device does not allow measuring voltage drops from a lower value to a higher one and vice versa at the same time. And since a large number of analog devices are involved in generating the output signal, this leads to an increase in the total measurement error. The purpose of the invention is to enhance the functionality and simplify the circuitry of the device. The goal is achieved by the fact that an astatic balancing system is introduced into the device for measuring the alternating voltage of the alternating voltage, which contains a recorder of extremes and an voltage level lock, while the input of the recorders of extremes and an input of a voltage level lock is connected to the input the terminals of the device, the recorder's output of the moment of occurrence of extrema is connected to the control input of the voltage level lock, and the output of the voltage level lock is connected to go system astatiches who equilibration. The drawing shows the structures on the scheme of the proposed device. The device consists of a recorder of 1 moments of occurrence of extremes, a latch of 2 levels of voltage, a system 3 of static balancing, including an operational amplifier and an integrator 5. The input of the device are the inputs of the register of moments of occurrence of extremes and a latch of voltage. The device works as follows. The measured alternating voltage is fed to the input of the recorder 1 moments of occurrence of extremes and to the input of the clamp 2 voltage levels. At the command of the output pulse of the recorder 1, when registering each extremum, the voltage at the output of latch 2 takes the value of this extremum and saves it until the next one is registered. The output of the latch is applied to the INPUT of the op amp i, covered by negative feedback with integrator 5. Amplifier k and integrator 5 are astatic balancing systems. If such a system monitors voltage fluctuations, its transient time is directly proportional to the voltage mismatch at the input of the operational amplifier k and the integrator output 5. Transient processes of the system correspond to rectangular pulses at the output of the operational amplifier k whose polarity corresponds to the direction of the jump in the input voltage, and the duration - the magnitude of this jump, and therefore, the magnitude of the differential measured voltage. This device for measuring the amplitude difference of the alternating voltage differs favorably from the one known for its simplicity of design and its functionality. A simpler structure of the device, which involves reducing the number of analog nodes in the signal conversion path, leads to a decrease in the total measurement error. In addition, to measure alternating voltage amplitudes at the same time from minimum to maximum and vice versa, two devices similar to the known devices were required, and with modern methods of digital processing and display of information at the device output, an analog-to-digital converter is required. When using the proposed device, the solution to the same problem requires only one device without the use of an analog-digital converter, since its output signal is a pulse duration that is easily converted into a digital time code by a pulse converter. Claims An apparatus for measuring alternating voltage amplitude fluctuations, comprising a recorder of extremes of moments and a voltage level lock, characterized in that, in order to expand the functionality and simplify the circuit of the device, an astatic balancing system is introduced, with the input of the moment recorder. the extremes and the voltage level clamp input are connected to the output terminals of the device, the output of the extremum moment recorder is connected to the control input of the level clamp with voltage 1i, and the voltage level clamp output is connected to the input of the static balancing system.

Sources of information taken into account in the examination

1. USSR author's certificate ff 42829Q, cl. G 01 R GE / O, 1972.

2. USSR author's certificate fP 427288, cl. G 01 R 19/0, 1972.

Claims (1)

Claim A device for measuring fluctuations in the amplitude of an alternating voltage, containing a recorder of moments of occurrence of extrema and a voltage level lock, distinguished by the fact that, in order to expand the functionality and simplify the circuit of the device, an astatic balancing system is introduced, while the moment recorder input . 5 occurrences of extrema and the input of the clamp of the voltage level are connected to the output terminals of the device, the output of the recorder of moments of occurrence of extrema is connected to the control input - _G Ν ’ 983560 6 is a house of a voltage level lock, and the output of a voltage level lock is connected to the input of the astatic balancing system.