Roentgen discovered X-ray in 1895, which laid the foundation of medical imaging. X-ray tube has experienced three stages: ion X-ray tube and electron X-ray tube. With the development of power electronics technology and microcomputer technology, X-ray machines are developing in the direction of high performance and low cost. The high voltage generating circuit is changed from the traditional power frequency (50Hz) to the intermediate frequency (400~20KHz). 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, reducing 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 40 KHz, the instantaneous power is1600 W, the output tube voltage is adjustable in the range of 50 ~ 100 kV, the output tube current is adjustable in the range of 3 ~ 8 Ma, and the power factor is not lower than 0.92. 125). The high-frequency inverter power supply of this machine adopts advanced IGBT switching devices and high-frequency resonant inverter technology to output DC tube voltage and tube current efficiently and reliably, and the anode high voltage is stable. The microprocessor is used to control the tube current and the tube voltage. Perfect protection measures, with over-input voltage, over-tube current and over-power protection. Can self-diagnose the connection status of each part of the system and display the status. Friendly man-machine interface, using large Chinese characters or English LCD display. More. ...
1895 discovered x-rays, which laid the foundation of medical imaging. X-ray machine has experienced ion X-ray tube, electron X-ray tube and rotating anode X-ray tube. With the development of power electronics technology and microcomputer technology, the development direction of X-ray machine is high performance and low cost. The high-voltage generator handles overclocking (400-20KHz) and high-frequency (above 20KHz). The volume of the high-voltage generator is ...
Table of Contents: Pages 3-8 of the Table of Contents
Page 8- 10 of the abstract
Abstract Page 10- 12
Chapter 1 Introduction Page 13-22
? Overview page 13- 14
? Development of x-ray machine 14- 15 pages
? Modern X-ray machine 15- 19
? Features of the medium and high frequency X-ray machine 15- 16 pages
? Comparison between intermediate and high frequency X-ray machines and power frequency X-ray machines 16- 19
? The research task of this topic-the development of high-frequency dental X-ray machine 19-20 pages.
? Topic Introduction Page 20-22
? Subject Source and Research Objectives Page 20
? Key problems to be solved Page 20
? Research Scheme and Feasibility Analysis 20-2 1 page
? The characteristics and innovations of this topic. Page 2 1-22
Chapter 2 X-ray principle, pages 22-26.
? Generation of X-rays Page 22
? The radiant energy spectrum of X-rays Page 22-24
? The nature of X-rays Page 24-25
? Basic principles of X-ray imaging Page 25-26
Chapter III X-ray Machine Structure Page 26-37
? X-ray tube Page 26-29
? Structure of X-ray tube Page 26-27
? X-ray tube' specifications' page 27
? Basic characteristics of X-ray tube Page 27-29
? X-ray tube focus Page 29-35
? Actual Focus and Effective Focus Page 29-30
? Influence of focus size on image quality Page 30-3 1
? Experiment on the influence of focus size on image resolution 3 1-35 pages
? Structural principle of traditional X-ray machine (power frequency X-ray machine) 35-36 pages
? Circuit characteristics of power frequency X-ray machine and medium and high frequency X-ray machine: 36-37 pages
Chapter 4 Prototype Development 37-5 1 page
? Design of high frequency dental X-ray machine
? Variable-frequency drive pp. 37-39.
? Adjustment of output power and voltage of high frequency power supply 39-40 pages