Field emission self-focusing pulsed X-ray generator with integrated high-voltage power supply

A technology of generating device and high-voltage power supply, which is applied in X-ray tubes, X-ray tube electrodes, X-ray tube components, etc., can solve problems such as poor focusing performance, poor reliability, and complicated circuits, and improve safety and reliability. performance, size and weight reduction, and high boosting efficiency

Active Publication Date: 2020-01-10
姚智伟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention mainly aims at the problems of the above-mentioned field emission X-ray tube with complex structure, complicated circuit, poor reliability, poor focusing performance and short life of carbon nanotubes, and provides a small-sized, medium-low power X-ray generating device

Method used

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  • Field emission self-focusing pulsed X-ray generator with integrated high-voltage power supply
  • Field emission self-focusing pulsed X-ray generator with integrated high-voltage power supply
  • Field emission self-focusing pulsed X-ray generator with integrated high-voltage power supply

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Embodiment 1

[0040] The schematic circuit diagram and structure section diagram of Embodiment 1 are shown in figure 2 with image 3middle. The components in this embodiment include a low-voltage power supply and control circuit 201, a glass vacuum chamber 202, an anode 203 of the X-ray generating part, a cathode 204 of the X-ray generating part based on field emission, a transformer primary coil 211, a transformer secondary coil 212, a circle A cylindrical transformer core 213 , a rectifier diode 214 and a coupling capacitor 215 .

[0041] The whole device is powered by a low-voltage DC power supply of 12 to 24 volts or a battery, and the low-voltage power supply and the control circuit 201 generate a high-frequency signal equal to the resonant frequency of the transformer, which is 72 kHz in this embodiment. Inside the low-voltage power supply and control circuit 201, the high-frequency signal passes through the H-shaped full-bridge circuit composed of semiconductor field effect transi...

Embodiment 2

[0047] Embodiment 2 adopts the same overall structure as Embodiment 1.

[0048] In this embodiment, the rectifier diode 214 and coupling capacitor 215 in Embodiment 1 are replaced by a voltage multiplication coupling circuit 520 (shown in Figure 5 ). The voltage doubling circuit can multiply the output voltage value of the high-voltage generator, and can increase the energy of X-rays to more than 100 kV for applications requiring higher energy.

[0049] In this embodiment, the anode 203 of the X-ray generation part in Embodiment 1 is formed by the anode 614 of the pointed X-ray generation part (shown in Image 6 ). The tapered anode can better focus the electron beam, resulting in a smaller focal spot and improving image resolution.

[0050] In this embodiment, the cylindrical transformer core 213 in Embodiment 1 is replaced by a pot-shaped transformer core 613 (shown in Image 6 and Figure 7 ). The pot-shaped magnetic core can reduce magnetic flux leakage and improve ...

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Abstract

The invention relates to a field emission self-focusing pulsed X-ray generating device integrated with a high-voltage power supply. The field emission self-focusing pulsed X-ray generating device is composed of an X-ray generating part and a high voltage generator, and connection relations of the X-ray generating part and the high voltage generator are as follows: a positive pole of the high voltage generator is connected with an anode of the X-ray generating part, and a negative pole of the high voltage generator is connected with a cathode of the X-ray generating part; the X-ray generating part adopts a diode structure based on a carbon nanotube field emission device and comprises a cathode of the X-ray generating part and an anode of the X-ray generating part; the carbon nanotube fieldemission device is taken as the cathode of the X-ray generating part; the high voltage generator comprises a control circuit, a transformer and a high voltage coupling circuit; the high voltage generator is powered up by an external low voltage direct current power supply; the transformer adopts a high-turns-ratio boosting transformer; a primary coil of the transformer is connected with a controlcircuit, and a secondary coil of the transformer is connected with the cathode of the X-ray generating part and the anode of the X-ray generating part by virtue of a coupling circuit; and the couplingcircuit is composed of a rectifier diode and a coupling capacitor.

Description

【Technical field】 [0001] The invention relates to a field emission self-focusing pulsed X-ray generating device integrated with a high-voltage power supply, which is applied in technical fields such as vacuum electronic equipment, X-rays, electron guns, computerized tomography, and nondestructive testing. 【Background technique】 [0002] X-rays are produced by bombarding high-atomic-weight metal targets with high-velocity electrons. A typical X-ray tube includes a metal anode target, a cathode electron source, and a high voltage power supply. Conventional X-ray tubes use a thermally emitting tungsten filament cathode to generate the electron beam. Due to the relatively slow heating and cooling process of the tungsten wire, traditional X-ray tubes cannot achieve high-speed switching. The structure of an X-ray tube using a hot cathode is shown in the attached Figure 1A shown. The X-ray anode 113 in the hot cathode X-ray tube and the hot cathode 114 of the X-ray generating p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J35/04H01J35/14H01J35/24
CPCH01J35/04H01J35/14H01J35/24
Inventor 孙泳海姚智伟
Owner 姚智伟
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