RU217706U1 - Multichannel high voltage power supply for photomultiplier tubes - Google Patents

Abstract

The utility model relates to the field of nuclear-physical measurements. The technical result consists in providing a multi-channel high voltage source for building multi-channel power supply systems for photomultiplier tubes. The device contains a case, on the front panel of which there are four high-voltage output connectors of high-voltage single-channel modules and connected to each channel of the high-voltage single-channel module, a high-voltage indication LED, a power supply presence LED, power off/on switches that provide a separate connected supply voltage, indication for each channel and the presence of high voltage at the output connectors. At the same time, four high-voltage single-channel modules connected to high-voltage output connectors, galvanic isolation elements, driver microcircuits that implement the physical level of the CAN interface, an overvoltage protection element for the CAN interface, voltage converters that generate voltages for supplying high-voltage single-channel modules and elements of the CAN interface are installed inside the hull. All this is done on the base board of the 3U Eurostandard construct on the standard Euromechanics construct 4HP wide and 3U high with a standard DIN41612M-64ABR connector of the Euromechanics construct and is protected by a switching board. At the same time, the galvanic isolation elements are bidirectionally connected to the channels of high-voltage single-channel modules and to driver microcircuits that implement the physical level of the CAN interface, which, in turn, are bidirectionally connected to the standard DIN41612M-64ABR connector of the Euromechanics design, designed to connect a multi-channel HV voltage source to a standard design. , and the standard DIN41612M-64ABR connector of the Euromechanics design is connected to voltage converters that generate voltages for powering high-voltage single-channel modules and CAN interface elements. 5 ill.

Description

The utility model relates to the field of nuclear measurements, instruments and equipment and can be used as a multi-channel high voltage source for powering photomultiplier tubes (PMT), (hereinafter BB source), refers to devices for building scientific and technical systems of multi-channel HE sources.

At present, the role of the use of devices that detect photons in industry, energy and transport is growing. First of all, these are nuclear technologies in industry and atomic energy, a sphere where Russia holds a leading position.

Currently, programs for the development of nuclear energy are being implemented on the basis of small nuclear power plants of the RITM-200 and RITM-400 types. It is planned to build and commission nuclear power facilities in hard-to-reach areas of the Far North. A fleet of nuclear icebreakers and floating nuclear power plants is being actively built. In this regard, photodetectors and detectors of ionizing radiation are increasingly being used, which are subject to increased requirements for reliability and high stability of operation (10 years or more of trouble-free operation). The operation of these devices is based on the use of highly stable, highly reliable high voltage sources of the order of 1500 V ... 3000 V, delivering current up to 1000 μA. At the same time, such sources should have an extremely low level of pulsations, on which the sensitivity and resolution of photodetectors, with which the intensity of ionizing radiation is estimated, largely depend.

Along with the above, scientific mega installations are being created in Russia. Targeted capital investments in nuclear physics are on the rise. The national project "Science" is being implemented in the Russian Federation - the creation of a network of research centers, sources of synchronous radiation, thermonuclear fusion facilities, neutron research reactors, the Nika mega project in Dubna, the creation of the International Center for Neutron Research near St. Petersburg and other

In the implementation of all the above national projects, photon detection devices are needed, and for them - high-voltage voltage sources.

The solution of the task (measurement of one photon) is achieved by creating high-voltage voltage sources with an extremely low noise level and high stability. Most of the photodetectors are built on the PMT - for their operation, high-voltage voltage sources from 700 V to 3000 V are required.

The relevance of the development of original Russian high-voltage multichannel sources corresponds to the "Strategy for the development of the electronic industry of the Russian Federation for the period up to 2030".

VV sources will ensure the implementation of R&D on the development of modern vacuum devices, optoelectronics, photonics, quantum electronics and piezotechnics.

In a number of applications, a significant number of simultaneously operating PMTs are required. Thus, in the JUNO mega project (China, Russia), about 20,000 PMTs are required to register antineutrinos. This implies the widespread use of standard inexpensive design solutions with the possibility of manufacturing such explosive sources in Russia.

At present, multichannel high-voltage power supply systems for PMTs are known, the closest technical solution to the claimed utility model is the device of the leading company in this field (CAEN A7236 - 12/24/32 Channel 3.5 kV, 1.5/0.15 mA (4W) Common Floating Return Dual Range Boards - CAEN - Tools for Discovery Found on the Internet on 12/01/2022 at: https://www.caen.it/products/a7236/). The PMT multichannel high-voltage power supply system has 12/24/32 independently controlled high-voltage channels, the output voltage is 3.5 kV. Dual current range: high power: 1.5mA (current monitor resolution 5nA); high resolution: 150 µA (current monitor resolution 500 pA). Available in both positive and negative polarity. Radial 52-pin or coaxial SHV connectors, common floating return common to all channels. Has low pulsation. Under/over voltage alert, over current and over voltage protection, blocking logic to turn on the unit and a software tool for easy channel management. The disadvantage of these devices is the excessive cost and complexity of the design, specific constructs that are not produced in Russia, which makes their use in the Russian Federation difficult.

The task to be solved by the development of the claimed utility model is the creation of a compact, highly reliable precision multi-channel HV voltage source for powering the PMT, which can be produced in Russia at an affordable cost and in compact dimensions.

The technical result consists in the creation of a multi-channel highly reliable precision compact HV source for building multi-channel PMT power systems.

The technical result is achieved by creating a multi-channel high voltage source for powering photomultipliers, containing a housing, on the front panel of which there are four high-voltage output connectors of high-voltage single-channel modules and connected to each channel of the high-voltage single-channel module, a high voltage indication LED, a supply voltage presence LED, power off/on switches that provide separate connected supply voltage, indication for each channel and the presence of high voltage at the output connectors, while four high-voltage single-channel modules connected to the high voltage output connectors, galvanic isolation elements, driver chips that implement the physical layer of the CAN interface , the CAN interface protection element against surges, voltage converters that generate voltages for powering high-voltage single-channel modules and CAN interface elements are installed inside the case and all this is done on the base board of the Eurostandard 3U construct on a standard Euromechanics construct 4HP wide and 3U high with a standard DIN41612M-connector 64ABR of the Euromechanics design and is protected by a switching board, while the galvanic isolation elements are bidirectionally connected to the channels of high-voltage single-channel modules and to the driver chips that implement the physical level of the CAN interface, which, in turn, are bidirectionally connected to the standard DIN41612M-64ABR connector of the Euromechanics design, designed for connecting a multi-channel high voltage source to a standard construct, and the standard DIN41612M-64ABR connector of the Euromechanics construct is connected to voltage converters that form voltages for supplying high-voltage single-channel modules and CAN interface elements.

The essence of the utility model "Multichannel high voltage source for powering photomultiplier tubes" (hereinafter BB-source) is illustrated by drawings, which show:

in fig. 1 shows the appearance of the explosive source from the front panel. The front panel has four switches for the supply voltage of high-voltage channels (on / off), a power indicator for a high-voltage single-channel module (PWR), an indicator for the presence of a high output voltage (HV) and a protective switching board;

in fig. 2 shows the appearance of the explosive source with the protective switching board removed. The figure shows the placement of four high-voltage single-channel modules;

in fig. 3 is a drawing of an explosive source, which shows the location - on the front panel of the high voltage indication LED; supply voltage presence LED; switches for turning off / on the power supply of high-voltage channels (on / off); four high voltage output connectors; protective switching board; four high-voltage single-channel modules manufactured by Marathon LLC; a standard connector DIN41612M-64ABR of the Euromechanics design for connecting an explosive source to a standard design and a base board;

in fig. 4 shows a 32-channel high voltage source in a standard Euromechanics 3U design. This source consists of eight proposed BB sources, as well as an adapter board (optional) for interfacing the CAN interface with the USB interface of a computer for service management and control;

in fig. 5 shows the functional diagram of the explosive source.

A multichannel high voltage source for powering photomultiplier tubes (HV-source) (see Figs. 1, 2, 3, 4, 5) contains a housing, on the front panel (1) of which there are four high voltage output connectors (5) of high-voltage single-channel modules (7) and connected to each channel of the high-voltage single-channel module (7) high voltage indication LED (2), supply voltage presence LED (3), power off/on switches (on/off) (4) providing separate connected supply voltage, indication for each channel of the high-voltage single-channel module (7) and the presence of high voltage at the high-voltage output connectors (5) of the high-voltage single-channel modules (7).

In this case, four high-voltage single-channel modules (7) are connected to high-voltage output connectors (5). Bidirectionally connected to the elements of galvanic isolation (10) and through the elements of galvanic isolation (10) are bidirectionally connected to drivers (11) that implement the physical layer of the CAN interface, made in the form of chips. High-voltage single-channel modules (7) through galvanic isolation elements (10) and drivers (11), which implement the physical layer of the CAN interface, are bidirectionally connected to the protection element of the CAN interface (12), made in the form of an overvoltage protection circuit, and through the interface protection element CAN (12) are bidirectionally connected to the standard DIN41612M-64ABR Euromechanics connector (8), which, in turn, is connected to a DC-DC voltage converter (13), which generates voltage to power high-voltage single-channel modules (7) and CAN interface elements ( not shown in the figures).

Four high-voltage single-channel modules (7) connected to high-voltage output connectors (5), galvanic isolation elements (10), drivers (11) that implement the physical layer of the CAN interface, an overvoltage protection element for the CAN interface (12), DC-DC converters voltages (13) that form the voltages for powering high-voltage single-channel modules (7) and the CAN interface element are installed inside the case and all this is done on the base board (9) of the Eurostandard 3U construct on the standard Euromechanics construct 4НР wide and 3U high with a standard DIN41612M-64ABR connector constructive Euromechanics (8) (see Structures supporting basic radio-electronic means. National standards of the Russian Federation. GOST IEC 60297-3-106 2020, Moscow Standartinform, 2020. Found on the Internet on 07.12.2022 at: https://protect.gost.ru /document.aspx?control=7&id=239284) and protected by the breakout board (6).

The device works as follows.

The HV source structurally consists of four shielded independent high-voltage single-channel modules (7), which are connected on the base board (9) to the CAN interface element. Each high-voltage single-channel module (7) implements the CAN interface (protocol CANopen profile DS401).

Thanks to the use of the CANopen protocol, each high-voltage single-channel module (7) is controlled from an external computing device. For example, industrial operator panels (HMI), a computer can be used as such devices.

In the design of the HV source, high-voltage single-channel modules (7) have a separate connected supply voltage through the power off / on switches (on / off) (4), which allows you to turn off currently unused channels of the high-voltage single-channel module (7). There is also an indication for each channel through the high voltage indication LED (2) and through the supply voltage presence LED (3), supply voltage, high voltage presence at the high voltage output connectors (5).

The high voltage output connector (5) of each channel of the high-voltage single-channel module (7) has a design that prevents accidental touching of the contact of the electrical part.

High-voltage single-channel modules (7) are the original development of Marathon LLC, they are made in a shielded case. The circuit of each high-voltage single-channel module (7) is based on a transformer solution using a high-voltage multiplier. The output voltage is adjusted by a 16-bit DAC, and the output high voltage is measured by a 24-bit ADC, which allows using digital feedback to ensure high accuracy in setting the output voltage. The output current is also measured by the 24-bit ADC.

All control and monitoring of each high-voltage single-channel module (7) is implemented autonomously. Measurement results as well as control commands are transmitted via the CANopen protocol. Power is supplied from the standard DIN41612M-64ABR connector of the Euromechanics design (8), from which DC-DC converters (13) form the necessary voltages for the operation of the HV source.

The HV source is controlled by the CAN interface element, which is connected via the standard DIN41612M-64ABR connector of Euromechanics design (8) to an external control system. The signal over the CAN interface element is bidirectional, respectively, the galvanic isolation elements (10), drivers (11) that implement the physical level of the CAN interface element, the CAN interface protection element (12) against overvoltage elements are also bidirectional (see the functional diagram of the HV source on Fig. 5).

The control signals over the CAN interface element are protected by the CAN interface protection element (12) from overvoltages, are received by drivers (11) that implement the physical level of the CAN interface element and through the galvanic isolation elements (10) are fed to high-voltage single-channel modules (7), which execute commands on CAN interface element (setting voltages, parameters). High-voltage single-channel modules (7) perform measurements and issue information about their status to the external control system via the CAN interface element through elements 10, 11, 12 and 8.

The design of the HV source is made in such a way that protection against accidental contact with high voltage circuits is provided. This is achieved due to the protective switching board (6) (see Fig. 3) of the design of the high voltage output connector.

As an example, a 32-channel high voltage source is presented in a standard Euromechanics 3U design using the claimed HV sources without special additional software (see Fig. 4). This source consists of eight available BB sources, as well as an adapter board (optional) for interfacing the CAN interface with the USB interface of a computer for service management and control.

Thus, an HV source was created, which is a 4-channel digital high-voltage source of positive or negative voltage up to 3000 V with a working code HV3000-04-pc, made in the form of a high-voltage single-channel module on the base board of the Eurostandard 3U construct on a standard Euromechanic construct 4HP wide and 3U high for building multi-channel systems of high voltage supply sources. The external view of the explosive source is shown in Fig. 1 and 2. The use of the CANopen interface makes it easy to integrate the HV source into complex multichannel systems (see Fig. 4) without developing special software.

The geometric parameters of the explosive source are shown in the drawing - FIG. 3.

The HV source is designed in two modifications - for positive or negative output high voltage. Based on the HV source, complex multi-channel systems of high-voltage sources are designed to power the PMT, in particular, in a 19-inch crate with a height of 3U of Eurostandard, 32 high-voltage channels and a CANopen-USB adapter control board originally developed by Marathon LLC (Fig. 4) for technological computer connection (service control of parameters, regulation, adjustment).

Claims (1)

A multichannel high-voltage source for powering photomultipliers, containing a housing, on the front panel of which there are four high-voltage output connectors of high-voltage single-channel modules and connected to each channel of the high-voltage single-channel module, a high-voltage indication LED, a supply voltage presence LED, power off/on switches that provide separate connected supply voltage, indication for each channel and the presence of high voltage at the output connectors, while four high-voltage single-channel modules connected to the high voltage output connectors, galvanic isolation elements, driver microcircuits that implement the physical level of the CAN interface, an overvoltage protection element for the CAN interface , voltage converters that generate voltages for powering high-voltage single-channel modules and CAN interface elements are installed inside the case and all this is done on the base board of the 3U Eurostandard construct on a standard Euromechanics construct 4HP wide and 3U high with a standard DIN41612M-64ABR connector of the Euromechanics construct and is protected by a switching board , while the galvanic isolation elements are bidirectionally connected to the channels of high-voltage single-channel modules and to driver microcircuits that implement the physical level of the CAN interface, which, in turn, are bidirectionally connected to the standard DIN41612M-64ABR connector designed by Euromechanics, designed to connect a multi-channel high voltage source to a standard constructive, moreover, the standard connector DIN41612M-64ABR constructive Euromechanics is connected to voltage converters that generate voltages for powering high-voltage single-channel modules and CAN interface elements.

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