基于TMS320F2812的LCC软开关变换器的研究与设计

发布时间：2019-07-07 06:57

【摘要】：随着工业化进程、现代化水平的不断提高，电力电子的发展也越来越迅速，新技术的应用已对电力电子设备提出更高的要求。在这样的发展趋势下，开关电源的功率和频率要求也逐步提高。本文主要对基于TMS320F2812的LCC谐振变换器进行研究。 LCC谐振型变换器可以实现开关管的软开关，降低变换器的开关噪声和开关损耗。软开关技术具有开关频率高、效率高、开关损耗小、开关应力小、体积小、重量轻等优点，是高效电源的发展方向。采用TMS320F2812实现全数字控制的开关电源，可提高输出电压的精度和稳定性。控制算法通过软件编程实现，，简单明了，在有其它需要的情况下，只需改变程序即可选择不同的控制功能。本文首先分析LCC谐振变换器的工作过程和工作原理，建立变换器的稳态模型及其等效电路，结合系统设计指标设计各个谐振器件的参数。其次，在建立LCC谐振变换器小信号模型的基础上，利用Saber仿真设计控制电路，实现系统的闭环控制。然后，利用TMS320F2812进行DSP部分的设计，包括外围电路、功率器件与驱动芯片的选取，PWM波的产生以及死区时间补偿的实现。最后按技术指标要求设计并做出样机，对系统进行实验验证，分析测试数据和主要参数的输出波形，结果实现了开关管的软开关，证实本文参数设计方法的合理性，达到减小变换器开关损耗、提高效率的目的。因此LCC谐振型变换器的研究对于开关电源的高频化、小型化、数字化发展提供了不少实用价值和指导意义。
文内图片：

图片说明：整流网络和滤
[Abstract]:With the process of industrialization and the continuous improvement of modernization level, the development of power electronics is becoming more and more rapid. The application of new technology has put forward higher requirements for power electronic equipment. Under such a development trend, the power and frequency requirements of switching power supply are also gradually improved. In this paper, the LCC resonant converter based on TMS320F2812 is studied. The LCC resonant converter can realize the soft switching of the switch tube and reduce the switching noise and switching loss of the converter. Soft switching technology has the advantages of high switching frequency, high efficiency, low switching loss, small switching stress, small volume, light weight and so on. It is the development direction of high efficiency power supply. The accuracy and stability of the output voltage can be improved by using TMS320F2812 to realize the all-digital control switching power supply. The control algorithm is realized by software programming, which is simple and clear. when there are other needs, different control functions can be selected by changing the program. In this paper, the working process and principle of LCC resonant converter are analyzed, the steady-state model and equivalent circuit of the converter are established, and the parameters of each resonant device are designed according to the system design index. Secondly, on the basis of establishing the small signal model of LCC resonant converter, the control circuit is designed by Saber simulation, and the closed-loop control of the system is realized. Then, TMS320F2812 is used to design the DSP part, including the selection of peripheral circuit, power device and driver chip, the generation of PWM wave and the realization of dead time compensation. Finally, according to the technical requirements, the prototype is designed and made, and the experimental verification of the system is carried out, and the test data and the output waveform of the main parameters are analyzed. The results show that the soft switch of the switch is realized, which proves the rationality of the parameter design method in this paper, and achieves the purpose of reducing the switching loss of the converter and improving the efficiency. Therefore, the research of LCC resonant converter provides a lot of practical value and guiding significance for the high frequency, miniaturization and digital development of switching power supply.
【学位授予单位】：南昌航空大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46

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