The Research On Key Technologies Of Power Module Circuits And Assembly Process Optimization

Power supply module refers to the power supply device which can be directly installed on the circuit board.It is a module or equipment that supplies power for other digital or analog loads such as ASIC,field programmable gate array,microprocessor and digital signal processor.In view of the advantages of power module,it is widely used in equipment switching,telecommunications,photoelectric transmission and routers and other fields.High frequency,high reliability,low consumption,low noise,anti-interference and modularization are the development trends of switching power supply.To achieve these goals,we need to achieve some key technologies.In the process of realizing these key technologies,we will encounter various problems.In view of these problems,the following work has been done: Firstly,this paper discusses the research background,purpose and significance of this paper in combination with the development of power module XXX72X,and summarizes the research content of this paper.With the rapid development of electronic technology,the power and current requirements of various electronic devices in the market are becoming higher and higher.It has become a trend to develop power modules with high power density and high performance.The market share of power module is increasing,both from the economic point of view and from the point of view of national defense analysis,power module has a very important impact.At present,in the DC/DC converter research,the performance of the best master circuit technology and patents are controlled in the United States,Japan,Europe technology developed countries.Domestic manufacturers of DC/DC converters mainly use the main control circuits produced in these countries to produce their own converters.Even if is the research institute which the homemade main control circuit,also mostly USES the reverse design method to imitate the foreign control chip.Design and develop the main control circuit with independent intellectual property rights,and take these main control circuits as the core,the production of independent property rights converter should be the development goal of domestic DC/DC converter.The advantages of module switching power supply in usage mode,development cycle,working performance and application field are explained.This paper summarizes the development of domestic and foreign power modules in core technology,points out the gap between domestic and foreign power modules,and points out the development direction of domestic power modules.In addition,the paper introduces the rich experience and main products of power module development and production of power module 47 of CLP group.Finally,it is pointed out that the circuit topology,the optimized circuit structure,the reasonable magnetic core structure,the power inductor with magnetic core,the perfect production process,the packaging material quality is the key technologies to achieve the best performance of the converter.Secondly,this paper has introduced the theory of power supply,this paper expounds the working principle of the whole power supply module,points out that the circuit topology optimization design of circuit structure,the reasonable structure of magnetic core,with a core power inductors,perfect production process,packaging material quality and test specifications of special test system is to make the performance of the converter to achieve the best condition of several key technologies.Main design idea of core components,focus on the design of the function modules of main control chip,the design method of main control chip,and each function module in detail the theoretical simulation analysis,the simulation data is given,the flow sheet verify that the master control chip can meet the design requirements of the power supply module,realize fully customized control of core chip.Finally,the surface mounting technology and its technological process are introduced in detail.Considering the assembling stress existing in the assembling process,several measures are proposed to eliminate pin stress,thermal capacity stress and mechanical assembly stress.Four processes of SMT assembling,including printing process,patching process,reflow welding process and filling process,are optimized to improve the assembly efficiency and process quality.Comparing the efficiency data before and after optimization,the results show that the printing process,mounting process and filling process have been greatly improved.The results show that the measures in this paper are effective and feasible.The causes of Manhattan phenomenon are summarized.Lower preheating temperature and shorter preheating time during preheating period,pad size,solder paste thickness,patch offset and component weight are all possible causes of Manhattan phenomenon.Then the physical basis of Manhattan phenomenon is explored in theory.In view of Manhattan phenomenon,this chapter focuses on heat capacity,component end heat capacity and printing welding.Three aspects of paste volume difference put forward measures to prevent or reduce the probability of Manhattan phenomenon.Finally,based on the theory and practical methods,this chapter carries out case analysis on the power module of XXX72X model about Manhattan phenomenon,finds out the way to solve Manhattan phenomenon,and implements it in the work,and achieves good results,and in other related work.Application.The technical difficulties in the design of XXX72X power supply module are analyzed.The main points are to ensure both advanced performance and mature technology in the optimization process,and to consider that the closed-loop control loop of power supply module must be fully stable and reliable.In view of these difficulties,the corresponding solutions are put forward,such as based on a large number of technical data,making full comparison,giving priority to several of them,debugging and testing these power modules,and finally determining one of them.In addition,through theoretical analysis,the power module circuit is designed,and then through a large number of experiments,the circuit design and parameters are optimized and adjusted.A stable closed loop is obtained.The research results of this paper have theoretical guiding significance and practical reference significance for the design of power module.