RU2744936C1 - Controlled high-stable voltage source with arbitrary-shaped signal generator function with isolated output - Google Patents

Abstract

FIELD: measurement technology.

SUBSTANCE: invention is intended for measurement and research. For this purpose, proposed is device of controlled high-stable voltage source with function of generator of signals of arbitrary shape with isolated output under high-voltage voltage, coming from separate low-noise precision power supply channel, which is made in form of control device connected to internal generator of arbitrary shape signals through optical communication channel, and output of internal generator of signals of arbitrary shape is connected to input of high-voltage amplifier with isolated output, at that, voltage is supplied to high-voltage amplifier and generator of arbitrary shape from galvanically isolated high-voltage converter of supply voltage, and voltage to supply unit is supplied to control device and galvanically isolated high-voltage converter of supply voltage. Communication of control device with external devices is provided through RS-485, USB connectors and synchronization input connector.

EFFECT: technical result is increase in amplitude of output signal of arbitrary shape by 2–3 orders and level of potential of high-voltage isolated output by 2 orders.

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Description

The inventive device is an adjustable high-stability voltage source with the function of an arbitrary waveform generator with an isolated output refers to voltage sources with a set function of changing the output signal relative to the isolated output under high-voltage voltage coming from a low-noise precision power channel. The device is intended for carrying out measurements and research in various fields of science and industry, in particular, for supplying power to analytical systems in analytical instrumentation and experimental physics with voltages varying in time according to specified laws.

To implement the power supply circuit of the analytical part of the device or the installation from a regulated high-stability voltage source with the ability to generate arbitrary waveforms with an isolated output, as a rule, two solutions are used. First, a power amplifier is used with the required amplitude of the output signals, the shape of which is set from a multifunctional signal generator with the ability to generate signals of a complex and arbitrary type. In this case, it is possible to use the isolated output of the generator, which makes it possible to set signals relative to the level potential of the isolated output. The second is the use of directly modern multifunctional generators based on digital technologies that generate signals of complex and arbitrary shapes. These generators may have an isolated output.

Known [1] high-voltage linear differential amplifier, the input of which is supplied with positive and negative control (amplified) voltages or from a built-in generator that generates sinusoidal, triangular and rectangular pulses of adjustable amplitude and frequency. The device has two linear amplifiers (inverting and non-inverting) operating in the range of 0.4-3.0 kV, with the help of which a paraphase output signal is obtained, which creates an amplitude doubling effect at the output. The disadvantages of such a device include: the absence of an isolated output, which makes it impossible to receive signals relative to the potential level of the isolated output in a wide range of values, the absence of a synchronization channel to receive signals that differ from the forms provided by the built-in generator.

Device [2] single-channel amplifier generates signals in the range from - 200V to +200V. The waveform can be set from an external signal generator. The frequency range of the amplifier output signal is 500 kHz. The disadvantages of such a device include: the absence of an isolated output, which makes it impossible to receive signals relative to the potential level of the isolated output in a wide range of its values, not a wide range of signals at the amplifier output, lack of a synchronization channel, an external signal generator is required.

The absence of an isolated output and the use of a third-party arbitrary waveform generator is a common disadvantage for such amplifiers [3-6] differing only in the range of output voltages and frequencies of the output signal.

As an adjustable high-stability voltage source with the function of an arbitrary waveform generator, we can consider devices [7, 8], which are essentially signal generators implemented on the basis of digital technologies that generate signals of complex and arbitrary shapes. The device [7] is characterized by a signal amplitude of up to 20 V and the absence of galvanic isolation of the signal circuits ground from the ground bus (isolated output), and the device [8] is characterized by an even lower output signal amplitude, but has a signal offset mode relative to the ground potential by -5 + 5 B. Both devices can generate a constant stable signal, but no more than 20 V and 10 V, respectively.

The device of an adjustable voltage source with the function of an arbitrary waveform generator with an isolated output [9] is the closest known, selected as a prototype. In this device containing a control board, an arbitrary waveform generator, a synchronization channel, an amplifier, an isolated output. The device under consideration, built on the basis of digital technologies, is a modern multifunctional generator that allows obtaining output signals of a given shape, in particular, a stable constant voltage. The presence of an isolated output makes it possible to generate signals relative to the output potential. Significant disadvantages of this device are the very low amplitude of the output signal (up to 10 V) and the small potential of the isolated output (42 V maximum).

The objective of the invention is to increase the signal amplitude by 2-3 orders of magnitude, to increase the potential of the isolated output level by 2-3 orders of magnitude.

The problem is solved due to the fact that in the known device of an adjustable voltage source with the function of an arbitrary waveform generator with an isolated output, the control device is connected to the internal waveform generator through an optical communication channel, and the output of the internal waveform generator is connected to the input of a high-voltage amplifier with an isolated output In this case, the voltage is supplied to the amplifier and the signal waveform generator from the galvanically isolated high-voltage converter of the supply voltage, and the voltage from the power supply is supplied to the control device and the galvanically isolated high-voltage converter of the supply voltage.

The inventive device of an adjustable isolated high-voltage voltage source with the function of an arbitrary waveform generator with an isolated output is schematically shown in figure 1. The proposed device contains a power supply unit (1), the input of which is supplied with voltage U power. After the power supply unit (1), the DC power supply voltage is fed to a galvanically isolated high-voltage converter of the supply voltage (2) and a control device (3), which provides communication with external devices via the RS-485 input connector (4), RS-485 output connector (5), USB connector (6) and input connector synchronization (7). The optical communication channel (8) is connected to the signal waveform generator (9), which is part of the high-voltage isolation of the output (10), consisting of a galvanically isolated high-voltage converter of the supply voltage (2), the output (11) of which is connected to the waveform generator (9) , and the output (12) is connected to a high-voltage amplifier (13) with an isolated output (14).

The proposed device works as follows. Supply voltage U supply is fed to the input of the power supply unit (1), which converts the AC supply voltage into a DC stabilized voltage. The stabilized voltage coming out of the power supply unit (1) is supplied to: the galvanically isolated high-voltage converter of the supply voltage (2) and the control unit (3) providing communication of external devices through the connectors (4-7). From the control device (3), the control signal in digital form by means of an optical communication channel (8) enters the signal waveform generator (9), as well as the supply voltage from the galvanically isolated high-voltage converter of the supply voltage (2) is supplied to the signal waveform generator (9) at the exit (11). The waveform generator (9) generates an analog signal, which is fed through the high-voltage accelerator (13) to the isolated output (14), and from the connector (6) to the input of the control device (2). A waveform generator (8) generates an analog signal to a high voltage amplifier (9) with an isolated output (10).

The proposed technical solutions allow increasing the amplitude of the arbitrary waveform output signal by 2-3 orders of magnitude and the potential of the high-voltage isolated output level by 2 orders.

In addition, the use of high-voltage galvanic isolation between the output and supply voltages, the use of an optical communication channel with a control device significantly expands the functionality of the proposed device.

Sources of information

1.http: //www.leysop.com/m5000.htm

2.http: //www.taborelec.com/9100а

3.https://www.itrc.narl.org.tw/Research/Product/Engineering/bipolar-e.php

4.http: //www.trekinc.com/products/HV_Amp.asp

5.http: //www.advanced-energy.com/en/10HVA_20HVA_Series.html

6.http: //prist.ru/produce.php/card/meas.htm?id=-73 8268721 # t = main

7.http: //lib.chipdip.ru/393/DOC001393536.pdf

8.http: //www.platan.ru/shem/pdf/generator.pdf

9.https: //www.dipaul.ru/catalog/pribor_generator_special_form_Agilent/

Claims (1)

A device of an adjustable isolated high-voltage voltage source with the function of an arbitrary waveform generator, including a power supply, a synchronization input, a connector for an external USB communication channel, connected to a control device, which in turn is connected to a waveform generator, characterized in that it includes an input connector RS-485, RS-485 output connector connected to a control device, which is connected via an optical communication channel to a signal waveform generator, to which a galvanically isolated high-voltage converter of the supply voltage is also connected, the inputs of a high-voltage amplifier are connected to the output of the signal waveform generator and the output of a galvanically isolated high-voltage converter of the supply voltage, the output of the high-voltage amplifier is connected to the isolated output, the optical communication channel and the galvanically isolated high-voltage converter of the supply voltage provide high-voltage isolation of the output.

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