The Research And Design Of LCC Soft Switching Resonant Based On TMS32OF2812

As the process of industrialization and the improving of modernization, thedevelopment of electronic power is increasing rapidly. And the application of newtechnology also puts forward higher requirement to the electronic equipment. Under thisdevelopment trend, the requirements for power and frequency of switching powersupply are gradually improved. This paper focused on the research of LCC resonantconverter based on TMS320F2812.The LCC resonant converter studied in this paper can achieve soft switching, sothat can reduce switching loss and noise. Soft switching has various advantages, such ashigh frequency, high efficiency, low loss, small stress, light weight and small volume.Therefore, the resonant converter is the development direction of high performancepower supply. In addition, the digital control for main circuit of power supply can berealized by using TMS320F2812, which can improve the accuracy and stability of theoutput voltage. Control algorithm is realized by software, which is simple andconvenient for choosing control functions according to different demands.Firstly, this paper discusses the working process and principle of the LCC resonantconverter, establishes a steady state model and equivalent circuit of the converter, thendesigns the parameters of each resonant component combined with system target.Secondly, it establishes a small signal model of LCC resonant converter. Through theSaber simulation study, the paper designs the control circuit based on the small signalmode, so that can achieve closed-loop control of the system. Thirdly, the DSP system isdesigned based on TMS320F2812, such as choosing the peripheral circuits, powerdevices and drive chip, generating the PWM wave and realizing dead-timecompensation. Finally, this paper designs a prototype according to the requirements oftechnical indicators, and analyzes the main waveforms to verify the system byexperiment. The results achieve soft switch of switching tube and verify the rationalityof parameter design method in this paper, the converter switching losses is reduced andefficiency is improved. Therefore the research of LCC resonant converter has certainpractical value and realistic significance to the development of high frequency, smallvolume and digitized switch power supply.