Abstract: X-ray was discovered by Roentgen in 1895, which laid the foundation for medical imaging. X-ray tube has gone through three stages: ion X-ray tube and electron X-ray tube. With the development of power electronics technology and microcomputer technology, X-ray machine is developing towards high performance and low cost. The high-voltage generating circuit has changed from the traditional power frequency (5Hz). The control circuit adopts single chip microcomputer technology, which can realize high-precision closed-loop control of tube current and voltage and accurately control exposure time. High-frequency inverter can output DC tube voltage and tube current, so as to reduce the harm of soft X-rays to human body. In this paper, a high-frequency DC dental (abbreviated) voltage generating circuit is independently developed. The frequency is 4 KHz, the instantaneous power is 16W, the output tube voltage can be adjusted in the range of 5 ~ 1 kV, the output tube current can be adjusted in the range of 3 ~ 8 Ma, the power factor is not less than .92, the overall efficiency is not less than 9%, and the bulb tube size is small. 125). The high-frequency inverter power supply of this machine adopts advanced IGBT switching device and high-frequency resonant inverter technology, and outputs DC tube voltage and tube current, with high efficiency and reliability, and the anode high voltage is stable. The microprocessor is used to control the tube current and the tube voltage. The protection measures are perfect, and it has the protection of over-input voltage, over-tube current and over (slightly) power. It can self-diagnose the connection state of each part of the system and display the state. The man-machine interface is friendly, and it is displayed in large Chinese characters or English liquid crystal ...
X-ray was discovered e (omitted) GEN IN 1895, which establishes foundation of Medical Imaging.X-ray machine experience（omitted）ase:ion X-ray tube, electron X-ray tube and rotating anode X-ray tube.with the development of power elect（omitted）nology and microcomputer technology, the development direction of X-ray machine is high performance and low cost. High voltage generator is processin（omitted）er-frequency t（omitted）requen Cy (4-2kHz) and high frequency (more than 2kHz), the bulk of high voltage generator is ...
Table of Contents: Page 3-8 of Table of Contents
Page 8-1 of Abstract
Page 1-12 of Abstract
Chapter 1 Introduction Page 13-22
. Overview page 13-14
? Development of X-ray machine Page 14-15
? Modern X-ray machine Page 15-19
? Features of the medium and high frequency X-ray machine Page 15-16
? Comparison between intermediate and high frequency X-ray machines and power frequency X-ray machines. Page 16-19
? The research task of this topic-the development of high-frequency dental X-ray machine. Page 19-2 < P >? Page 2-22 of project introduction
? Topic source and research objective, page 2
? Key problems to be solved Page 2
? Research Scheme and Feasibility Analysis Page 2-21
? The characteristics and innovations of this topic: Page 21-22
Chapter 2 X-ray Principles: Page 22-26
? Generation of x-rays, page 22
? The radiant energy spectrum of x-ray, page 22-24
? X-ray properties on page 24-25
? Basic principles of X-ray imaging Page 25-26
Chapter III Structure of X-ray Machine Page 26-37
? X-ray tube page 26-29
? Structure of X-ray tube Page 26-27
? X-ray tube's' specifications page 27
? Basic characteristics of X-ray tube Page 27-29
? The focus of X-ray tube Page 29-35
? Actual Focus and Effective Focus Page 29-3
? The influence of focus size on image quality Page 3-31
? Experiment on the influence of focus size on image resolution Page 31-35
? Structure principle of traditional X-ray machine (power frequency X-ray machine) Page 35-36
? Circuit characteristics of power frequency X-ray machine and medium-high frequency X-ray machine: Page 36-37
Chapter 4 Prototype Development Page 37-51
? Design of high-frequency dental X-ray machine Page 37-41
? Principles of Inverter Page 37-39
? Adjustment of output power and voltage of high frequency power supply Page 39-4