The Design Of The Front-Stage Circuit Of The High-Voltage Generator Of The Ray Source

Because X-ray can penetrate the characteristics of objects,it is widely used in industrial flaw detectors and other equipment.The electrons emitted by the radio tube need huge energy to reach the anode metal target and generate rays during the impact.The energy is provided by the high voltage generator connected to the radiation source.The high voltage generator adjusts the input signal to a certain extent,making it a stable and controllable signal for the use of the radiation source.A certain type of radiation source needs a high voltage generator which can output0-30 k V.In the design of high voltage generator,not only the performance should be considered,but also it needs to have high stability.In this paper,the basic structure of the high-voltage generator is preliminarily determined according to the use requirements of the ray source.It is mainly divided into two parts : the pre-stage circuit and the post-stage circuit.In this paper,the pre-stage circuit is designed.The front stage circuit consists of the first stage Boost PFC circuit and the second stage phase-shifted full bridge circuit.Boost PFC is used to realize wide range input,improve power factor at 85 V-250 V AC input and output390 V DC.Phase-shifted full-bridge is used to stabilize the voltage at 300 V DC state.In the design of Boost PFC circuit and phase-shifted full-bridge circuit,the matching circuit structure is selected as the circuit model according to the required function of the circuit,and the circuit is calculated according to the relevant parameters.UCC28180 and UCC28950 are selected as the main chips of the circuit.After the perfect circuit structure,the data analysis software is used for circuit simulation to optimize the stability of the circuit.Taking the theoretical analysis as the cornerstone of the experiment,the simulation process is verified.The key is to build a platform for experiment and obtain the expected results.Finally,the high voltage generator is connected to the radiation source to further verify the feasibility of the theory.