High-power power supply device for gamma-ray irradiation test

Abstract

The invention discloses a high-power power supply device for a gamma-ray irradiation test, and belongs to the technical field of radiation resistance of aerospace components. The power supply device comprises an input EMI unit, a power conversion unit, an output switch control interface circuit, an output filtering unit, an acquisition protection unit, a power supply box body, a communication control unit and a fan, has radiation resistance and can directly supply power to a tested device in a radiation source. Meanwhile, through circuit design, the number of power supply channels and the power supply capacity of the system are increased on the basis of reducing line loss.

Description

Technical Field

[0001] This invention relates to a high-power power supply device for gamma-ray irradiation testing, belonging to the field of radiation protection technology for aerospace components. Background Technology

[0002] In recent years, numerous complex, high-power devices such as FPGAs and CPUs have been used in aerospace applications, necessitating ground-based total dose (TND) testing to determine their resistance to total dose radiation. Currently, TND testing primarily uses gamma rays generated by cobalt sources to simulate the total dose effect. The test devices are typically irradiated while powered on, requiring a power supply during the test. Because gamma ray irradiation causes significant damage to components, existing power supplies lack radiation resistance, preventing direct placement within the irradiation chamber. Power must be supplied to the device outside the irradiation chamber via cables tens of meters long. This long current transmission distance results in significant line losses, failing to reach the required voltage for device operation, necessitating repeated adjustments to meet test requirements and impacting efficiency. Furthermore, FPGAs and CPUs require numerous power supply channels and high single-channel current, which ordinary power supplies often lack. Multiple power supplies must be carried to the test site, causing inconvenience. Additionally, traditional DC power supplies have relatively outdated control methods, typically requiring manual adjustment via knobs or switches, lacking the convenient touch and remote control features of modern electronic devices. Therefore, it is necessary to design a device with multiple power supply channels, large power supply current, certain radiation resistance, convenient operation, and the ability to directly supply power to the device under test within the radiation source. Summary of the Invention

[0003] The technical problem solved by this invention is to overcome the shortcomings of the prior art and propose a high-power power supply device for gamma-ray irradiation tests. This device has radiation resistance capabilities and can directly supply power to the device under test within the radiation source. While reducing line losses, it expands the number of power supply channels and power supply capacity of the system, thereby improving the efficiency of the test.

[0004] The technical solution of this invention is:

[0005] A high-power power supply device for gamma-ray irradiation testing is located within the gamma-ray irradiation range and includes an input EMI unit, a power conversion unit, an output switch control interface circuit, an output filter unit, a data acquisition and protection unit, a power supply enclosure, a communication control unit, and a fan.

[0006] The input EMI unit is connected to the bus and is used to suppress bus noise and reflected interference generated on the bus when the power supply device is working.

[0007] The power conversion unit is equipped with multiple DC / DC converters to convert the voltage signal output from the input EMI unit into multiple voltage signals of different amplitudes.

[0008] The output switch control interface circuit remotely controls the power on / off of each output voltage signal of the power conversion unit by receiving the power on / off command sent by the communication control unit.

[0009] The output filtering unit performs noise reduction processing on each voltage signal output by the power conversion unit to supply power to the device under test.

[0010] The acquisition and protection unit acquires the signal output by the output filtering unit to perform voltage and current acquisition and overvoltage and overcurrent protection.

[0011] The three structural surfaces of the power supply enclosure facing the radiation source are fitted with lead plates. The interior of the enclosure contains an input EMI unit, a power conversion unit, an output switch control interface circuit, an output filter unit, a data acquisition and protection unit, a communication control unit, and a fan.

[0012] The communication control unit outputs power-on / off commands to control the power conversion unit's DC / DC converters.

[0013] The fan is powered by a voltage signal output from the input EMI unit.

[0014] Furthermore, the three structural surfaces of the power supply enclosure facing the radiation source are fitted with lead plates, the thickness of which is not less than 4mm, to reduce the radiation dose reaching the inside of the power supply enclosure.

[0015] Furthermore, the input EMI unit includes three input filtering modules: the first-stage input filtering module consists of common-mode and differential-mode filtering elements to suppress bus differential-mode and common-mode noise; the second-stage input filtering module consists of differential-mode filtering elements to suppress secondary input filtering generated by the power conversion unit; and the third-stage input filtering module consists of common-mode and differential-mode filtering elements to suppress cooling fan power supply input filtering.

[0016] Furthermore, the DC / DC converter has radiation resistance capability and is selected from the LDCD / (20-50) series DC / DC converter.

[0017] Furthermore, the power supply enclosure adopts a modular and plug-in design, with an internal design of one BUS baseboard and four plug-in boards. The four plug-in boards include three power supply boards and one communication control board. The input EMI unit, power conversion unit, output switch control interface circuit, and output filter unit are distributed on the three power supply boards, while the communication control unit is located on the communication control board.

[0018] Furthermore, a data acquisition and protection unit is installed inside the power supply box. The data acquisition and protection unit collects the voltage and current of each output of the power conversion unit. If the voltage or current exceeds the set overcurrent and overvoltage protection point, an overvoltage and overcurrent signal is generated and sent to the output switch control interface circuit. The output switch control interface circuit controls the power-off of the corresponding DC / DC converter to realize output overcurrent and overvoltage protection.

[0019] Furthermore, the overcurrent and overvoltage protection points are designed to protect against output overvoltage exceeding 1.2 times the nominal value and output overcurrent exceeding 1.1 times the nominal value.

[0020] Furthermore, an output voltage adjustment circuit is also provided and installed inside the power supply box; the output voltage adjustment circuit adjusts the output voltage value of each DC / DC converter on the power conversion unit.

[0021] Furthermore, the output filtering unit includes a common-mode filtering circuit composed of a common-mode inductor and a common-mode capacitor, and a differential-mode filtering circuit composed of a tantalum capacitor and a high-frequency ceramic capacitor connected in parallel, to reduce ripple noise in the output voltage of the power conversion unit.

[0022] Furthermore, the fan is mounted on a structural plate of the power supply box that is not fitted with a lead plate, and the box has an air duct inside to improve the device's heat dissipation efficiency.

[0023] The advantages of this invention compared to the prior art are:

[0024] (1) The power supply enclosure of the present invention has lead plates installed on three structural surfaces facing the radiation source, which can effectively reduce the radiation dose reaching the inside of the enclosure and has the ability to resist gamma-ray radiation. The key components used in the electrical device are all radiation-resistant products or radiation-insensitive products, and have the ability to resist gamma-ray radiation.

[0025] (2) The power conversion unit of the present invention can isolate and convert a 42V primary power supply to generate multiple power supply voltages, and the power output channels reach 10, which can meet the multi-channel power supply requirements of devices such as FPGA and CPU.

[0026] (3) The power supply system of the present invention has remote control and manual control modes, and the operation is more convenient and flexible.

[0027] (4) The power supply box of the present invention adopts a modular and plug-in design. It has one BUS base plate and four plug-in boards. Each board is relatively independent, the assembly process is simple, the heat distribution is relatively uniform, the air duct is reasonably designed inside the box, and the cooling fan installed on the rear panel makes the heat dissipation more effective and reasonable, and the mutual interference between components is less. Attached Figure Description

[0028] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0029] Figure 1 This is a block diagram of the high-power power supply system for gamma-ray irradiation experiments according to an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the first-stage input filter circuit of the input EMI unit in an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the two-stage input filter circuit of the input EMI unit in an embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of the three-stage input filter circuit of the input EMI unit in an embodiment of the present invention;

[0033] Figure 5 This is a schematic diagram of the chassis structure according to an embodiment of the present invention;

[0034] Figure 6 This is a schematic diagram showing the connection of a high-power power supply system for gamma-ray irradiation experiments according to an embodiment of the present invention. Detailed Implementation

[0035] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0036] This invention proposes a high-power power supply device for gamma-ray irradiation experiments, such as... Figure 1 As shown, it includes an input EMI unit, a power conversion unit, an output switch control interface circuit, an output filter unit, a data acquisition and protection unit, an output voltage adjustment circuit, a power supply enclosure, and a communication control unit.

[0037] The input EMI unit prevents bus noise from harming the power supply and reduces reflected interference from the power supply during operation. The input EMI unit circuit mainly consists of three parts. For example... Figure 2As shown, the first part is the first-stage input filter of the component. Based on the power level configuration of the subsequent circuit, the 42V bus DC / DC dedicated EMI filter LFE / (20-50)-461-500 from the 771 Institute's radiation-resistant product is selected. Its internal design mainly consists of common-mode and differential-mode filtering elements, providing good suppression of both differential-mode and common-mode noise, with an insertion loss of no less than 30dB within 2MHz. For example... Figure 3 As shown, the second part is a two-stage input filter circuit group mainly composed of differential-mode filter elements, used for secondary input filtering of each DC / DC power conversion circuit in the power conversion unit. The two-stage input filter circuit design uses capacitors and inductors to form a Π-type filter circuit, which can effectively suppress differential-mode conducted interference between the isolation bus and the secondary power conversion circuit, and also effectively suppress mutual interference between multiple secondary power conversion circuits with different configurations. For example... Figure 4 As shown, the third part is the input filter circuit, mainly composed of common-mode and differential-mode filter components, used for filtering the power supply input of the cooling fan. The common inductor is a Shenzhen Zhenhua Fu Company wire-wound chip common-mode inductor JASMF1211-701-2P, with a rated current of 8A, inductive reactance of 500Ω, DC resistance of 8mΩ, and an actual maximum application current of 200mA. The filter capacitor is a 715-6 factory model JCT41L-1812-2C1-100V-106M-Z capacitor. This capacitor features ultra-low ESR and ultra-low ESL, providing excellent noise absorption characteristics. Compared with tantalum capacitors, it allows for greater ripple current, is non-polarized, and has high reliability. The capacitor's rated voltage is 100V, and the actual rated application voltage is 42V. The fan power supply interface is designed with an inductive load suppression circuit. The 2CZ5811U silicon fast recovery diode from Jihua Semiconductor is connected in anti-parallel to the fan power supply interface and in series to the positive power supply line. The 2CZ5811U has a rated current of 3A, a reverse withstand voltage of 150V, and an actual application current of 400mA and a voltage of 42V.

[0038] The power conversion unit isolates the 42V primary power supply output from the input EMI unit using a radiant 42V bus thick-film LDCD / (20-50) series DC / DC converter, generating various power supply voltages required for system operation and achieving electrical isolation between input and output. All LDCD / (20-50) series DC / DC converters feature adjustable output voltage; output adjustment can be achieved by configuring appropriate external circuitry through the TRIM terminal.

[0039] The output switch control interface circuit receives ON / OFF commands from the communication control unit, enabling the host computer to remotely control the power supply voltage of each output channel of the power conversion unit. Simultaneously, the overcurrent and overvoltage protection signals (active high) of the power supply output control interface circuit control the primary side of the optocoupler, performing overcurrent and overvoltage protection for that power supply output channel through this interface. The ON / OFF commands for the output voltage are level commands: a high level for 5V power-on and a low level for power-off. One ON / OFF command is designed for each single power supply channel, and one ON / OFF command is designed for each group of positive and negative output power supplies.

[0040] The output filtering unit, in conjunction with the selected DC / DC converter's internal first-stage LC filter, uses a common-mode filter circuit composed of a common-mode inductor and a common-mode capacitor at the power output terminal, and a differential-mode filter circuit composed of a large-capacity tantalum capacitor and a high-frequency ceramic capacitor connected in parallel, to further reduce the ripple noise in the DC / DC converter's output voltage.

[0041] The data acquisition and protection unit primarily acquires and protects the voltage and current signals from each output channel. The acquisition and protection circuit, centered on an operational amplifier, conditions, monitors, and compares the voltage and current signals from each output channel. On one hand, the acquired and conditioned voltage and current signals are output to the communication control unit. On the other hand, the acquisition and protection circuit generates overvoltage and overcurrent signals based on the set overcurrent and overvoltage protection points, sending them to the output switch control interface to achieve output overcurrent and overvoltage protection. Output overvoltage is designed to protect against values ​​exceeding 1.2 times the nominal value, and output overcurrent is designed to protect against values ​​exceeding 1.1 times the nominal value.

[0042] The output voltage adjustment circuit mainly consists of a potentiometer, a resistor, and a manual switch. The potentiometer and manual switch are mounted on the front panel of the product chassis for easy operation. For voltage settings via the manual switch, the output voltage can be adjusted within a range above or below the nominal voltage value. The potentiometer adjusts the output voltage by increasing or decreasing it. The potentiometers used are the WIW3296W / 3296W series pre-adjustable glass glaze potentiometers from factories 4310 and 893. The manual switch is the KN6J-203AM toggle switch from factory 851, allowing for ±10% adjustment of each output voltage.

[0043] The power supply enclosure includes an internal modular structure and an overall device structure. The internal modular structure has a mechanical frame, and the overall device structure is designed for ease of use and incorporates gamma-ray radiation shielding. Figure 5As shown, the power supply chassis adopts a modular, plug-in design. Internally, it houses one BUS baseboard and four plug-in boards (three power boards and one communication control board). The input EMI unit, power conversion unit, output switch control interface circuit, output filter unit, data acquisition and protection unit, and output voltage adjustment circuit are distributed across the three power boards. The communication control unit is located on the communication control board. Each board is relatively independent, simplifying assembly and resulting in relatively uniform heat distribution. The chassis features a well-designed airflow system, and a cooling fan on the rear panel further enhances cooling efficiency and reduces interference between components. Three surfaces of the power supply chassis facing radiation sources are fitted with 4mm thick lead plates, effectively reducing the radiation dose reaching the interior of the chassis and providing a certain degree of radiation resistance.

[0044] The communication control unit can power on / off each output, display the collected power and current data, and calculate the output power data.

[0045] The high-power power supply device for gamma-ray irradiation experiments proposed in this invention is used for gamma-ray irradiation experiments. A connection diagram is shown below. Figure 6 As shown, the high-current DC power supply unit isolates and converts the 42V primary bus voltage into the secondary DC voltage required for the task. The output voltages of each circuit are adjusted using potentiometers. Information exchange with the measurement and control computer via a UART serial bus enables remote display and control of the high-current DC power supply unit's output voltage, as well as remote power-on / off control. The real-time output voltage, current, and power values ​​are monitored and displayed by the measurement and control computer, which can set and control overcurrent / overvoltage shutdown outputs.

[0046] The embodiments described above are merely preferred embodiments of the present invention. Ordinary variations and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-power power supply device for gamma-ray irradiation experiments, characterized in that, The power supply device is located within the gamma-ray irradiation range and includes an input EMI unit, a power conversion unit, an output switch control interface circuit, an output filter unit, a power supply enclosure, a communication control unit, and a fan. The input EMI unit is connected to the bus and is used to suppress bus noise and reflected interference generated on the bus when the power supply device is working. The power conversion unit is equipped with multiple DC / DC converters to convert the voltage signal output from the input EMI unit into multiple voltage signals of different amplitudes. The output switch control interface circuit remotely controls the power on / off of each output voltage signal of the power conversion unit by receiving the power on / off command sent by the communication control unit. The output filtering unit performs noise reduction processing on each voltage signal output by the power conversion unit to supply power to the device under test. The three structural surfaces of the power supply enclosure facing the radiation source are fitted with lead plates. The interior of the enclosure contains an input EMI unit, a power conversion unit, an output switch control interface circuit, an output filter unit, a data acquisition and protection unit, a communication control unit, and a fan. The communication control unit outputs power-on / off commands to control the power conversion unit's DC / DC converters. The fan is powered by a voltage signal output from the input EMI unit.

2. The high-power power supply device for gamma-ray irradiation experiments according to claim 1, characterized in that, The three structural surfaces of the power supply enclosure facing the radiation source are equipped with lead plates, the thickness of which is not less than 4mm, to reduce the radiation dose reaching the inside of the power supply enclosure.

3. The high-power power supply device for gamma-ray irradiation experiments according to claim 1, characterized in that, The input EMI unit includes three input filtering modules. The first-stage input filtering module consists of common-mode and differential-mode filtering elements to suppress bus differential-mode and common-mode noise. The secondary input filtering module consists of differential-mode filtering elements to suppress the secondary input filtering generated by the power conversion unit; The three-stage input filtering module consists of common-mode and differential-mode filtering components to suppress the power supply input filtering of the cooling fan.

4. A high-power power supply device for gamma-ray irradiation experiments according to claim 1, characterized in that, The DC / DC converter is radiation resistant and is selected from the LDCD / (20-50) series DC / DC converter.

5. A high-power power supply device for gamma-ray irradiation experiments according to claim 1, characterized in that, The power supply enclosure adopts a modular and plug-in design, with one BUS baseboard and four plug-in boards inside. The four plug-in boards include three power boards and one communication control board. The input EMI unit, power conversion unit, output switch control interface circuit, and output filter unit are distributed on the three power boards, and the communication control unit is located on the communication control board.

6. A high-power power supply device for gamma-ray irradiation experiments according to claim 1, characterized in that, It also has a data acquisition and protection unit installed inside the power supply box. The data acquisition and protection unit collects the voltage and current of each output of the power conversion unit. If the voltage or current exceeds the set overcurrent and overvoltage protection point, it generates an overvoltage and overcurrent signal and sends it to the output switch control interface circuit. The output switch control interface circuit controls the power-off of the corresponding DC / DC converter to realize output overcurrent and overvoltage protection.

7. A high-power power supply device for gamma-ray irradiation experiments according to claim 6, characterized in that, The overcurrent and overvoltage protection points are designed to protect against output overvoltage exceeding 1.2 times the nominal value and output overcurrent exceeding 1.1 times the nominal value.

8. A high-power power supply device for gamma-ray irradiation experiments according to claim 1, characterized in that, It also includes an output voltage adjustment circuit, which is installed inside the power supply box; the output voltage adjustment circuit adjusts the output voltage value of each DC / DC converter on the power conversion unit.

9. A high-power power supply device for gamma-ray irradiation experiments according to claim 1, characterized in that, The output filtering unit includes a common-mode filter circuit composed of a common-mode inductor and a common-mode capacitor, and a differential-mode filter circuit composed of a tantalum capacitor and a high-frequency ceramic capacitor connected in parallel, to reduce ripple noise in the output voltage of the power conversion unit.

10. A high-power power supply device for gamma-ray irradiation experiments according to claim 1, characterized in that, The fan is mounted on the structural plate of the power supply box without lead plates, and the box has air ducts inside to improve the heat dissipation efficiency of the device.

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