Design Of A High-Voltage And High Pulse Power Characteristic Light-Triggered Thyristor Device

As the cornerstone of modern industrial development,power electronics technology as a new subject technology,its power conversion and processing capabilities have greatly improved the intelligence of power applications,and is widely used in modern power systems.The key to the stable operation of modern power systems lies in the diversification of power electronic system functions.Power semiconductor devices,as the main electronic components of power electronic systems,play an important role in the field of power electronics.Among them,Light-Triggered Thyristor(LTT)has the advantages of high forward blocking voltage,simple light triggering component,short triggering delay,small triggering power and strong anti-electromagnetic interference capability,etc.,in the field of pulse power(Pulse Power).High-voltage direct current transmission systems are widely used.Light-triggered thyristors play an important role in pulse power,UHVDC engineering applications,etc.However,the overall technical level of domestic LTT is relatively weak.In this paper,through the study of LTT related characteristics,a LTT with a breakdown voltage of 6000 V and high pulse power characteristics is designed.The main work is as follows:(1)The development of power electronics technology and power devices,the development history of light-controlled thyristors and the research status at home and abroad are introduced.The structure,working principle,static and dynamic characteristics of light-triggered thyristors are analyzed in detail.According to the analysis,the way to improve the pulse power capability of the device is proposed,which lays a theoretical foundation for the design optimization of the newly proposed photocontrolled thyristor device.(2)The 6000 V PT-LTT structure optimization design is completed.firstly,the advantages of light triggering compared with electric triggering are compared by simulation and experiment,then the wavelength and optical power density of the light triggering parameters are simulated and analyzed,and finally the traditional structure and conduction are turned on.Analysis of transient characteristics,found the shortcomings of the traditional structure,and proposed our new design scheme for light-triggered thyristors.Determination of substrate silicon material thickness,substrate resistivity,grating and cathode length,and P+ anode,N-buffer layer,P-Well and N+ cathode regions by blocking voltage,light triggering characteristics,and dynamic current requirements,respectively.The structure parameters of the device such as junction depth and doping concentration are finally determined by simulation optimization design.(3)Junction terminal and layout packaging design.The junction termination technology suitable for the light-triggered thyristor of this design is introduced.Using these techniques,a junction termination structure which satisfies the voltage resistance requirements of the new structure light-triggered thyristor is designed.The schematic diagram of the layout is designed according to the parameters of the cell and the junction terminal.The device process manufacturing process was determined by simulation tools;a package type suitable for the light-triggered thyristor of this design was designed according to the device-related characteristics.