| With the rapid development of power electronics technology,digital control technology is more and more widely used in power electronics systems,so colleges and universities pay more attention to the power electronics technology courses learning of students.The reform of the experimental teaching system corresponding to the power electronic technology course has been proposed by colleges and universities to strengthen the practical ability of students,and truly achieve the effect of applying what they have learned.The traditional analog control experiment platform has many disadvantages,such as complicated circuit,susceptible to interference,complicated in operation and high in cost,and it has become increasingly unable to meet the development needs of power electronics teaching.Aiming at these shortcomings,based on the needs of industry-university-research projects,a DSP-based digital power electronic experimental platform is designed in this paper.Combined with the basic knowledge of power electronic circuits,a digital control method is used to integrate all the experimental circuits into one,achieving the purpose of simple circuit,rich functions,strong anti-interference ability,and low cost,and meeting the needs of modern teaching.The main content of this article is as follows:Firstly,the paper introduces the significance of the power electronics experiment platform for the current university teaching.According to the teaching contents of the power electronics courses,the necessity of the digital power electronics platform for the modern teaching is analyzed and a multifunctional digital power electronics experiment platform is designed.Secondly,Combined with the functional requirements of the experimental platform,the hardware design of the experimental platform control system is completed.After compared with a variety of control chips,TMS320F28027 is selected as the main system controller.Then combined with the characteristics of different circuits,the concept of modular circuit design is proposed,which is used to design the main circuit,power circuit,signal conditioning circuit,drive circuit,protection circuit,the communication circuit,the PWM signal isolation and amplification circuit modules.Thirdly,according to the functions that the platform needs to realize,under the CCS6.0 development environment,the DSP program design is completed by using C language,and the PI control algorithm is added to the program to improve the dynamic performance of the system.Besides,the communication module program with the host computer is developed,and the RS232 communication mode is used to realize the communication connection with the upper computer,then a complete overall program framework is designed for the platform.Fourthly,the paper develops a complete host computer monitoring interface.According to the functions required by the users,under the Qt5.8 development environment,the upper computer human-computer interaction interface application program is designed for the system by using C++ language,and the communication connection with the lower computer is also added to the program,which can monitor the running status of the system in real time,so various status curves could be drawn in the monitoring interface according to the real-time data information of the lower computer.Finally,based on the design of the hardware part and the software part mentioned above,the development and improvement of the entire experimental platform are successfully realized in this paper,and the functions required to be completed are also verified,then the product is finally formed.The feasibility and stability of the platform design method have been fully verified by the operation of users for nearly a year. |
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