基于DSP的电感电流伪连续模式DC-DC变换器研究

发布时间：2018-08-26 08:23

【摘要】：直流-直流(DC-DC)开关变换器主要是利用现代电力电子技术来控制开关管的导通和关断的时间比率,从而达到直流斩波和控制输出电压的目的。脉冲宽度调制技术是一种比较经典的开关电源控制技术,利用PWM波来控制开关管,但是其电路复杂,系统抗干扰能力差。脉冲序列控制(pulse train,PT)是近年来兴起一种新型开关电源控制技术,其控制电路相对于经典PWM控制电路更加简单,系统抗干扰能力更强,当PT控制技术应用于电感电流断续工作模式(discontinuous conduction mode,DCM)DC-DC变换器时特性优良,但应用于连续工作模式(continuous conduction mode,CCM)变换器时会出现控制问题,因此PT控制变换器带负载能力不足。针对这一突出问题,本文研究一种新型的PT控制电感电流伪连续工作模式(pseudo-continuous conduction mode,PCCM)变换器,将PT控制技术与新型电路拓扑相结合,有效提高了变换器的带载能力。论文介绍了PT控制PCCM变换器的工作原理,运用MATLAB软件得出了仿真工作波形,设计了基于DSP的硬件电路,并得出了实验波形,进一步证明了相关结论。本文主要研究成果如下:(1)对PT控制PCCM模式Buck变换器的带负载能力进行理论分析。(2)运用MATLAB搭建PT控制PCCM工作模式DC-DC Buck变换器的仿真模型,观察仿真实验波形,证明理论分析的正确性。(3)根据仿真模型原理,设计基于DSP的硬件电路,并在CCStudio v3.3平台上进行软件编程部分设计。(4)利用仿真器将程序下载到DSP开发板,并将开发板与硬件电路相连接,进行硬件电路实验。(5)将硬件电路采集得到的波形与软件仿真所的波形进行对比分析并得出结论。
[Abstract]:The DC-DC (DC-DC) switching converter mainly uses modern power electronic technology to control the time ratio of switch on and off, so as to achieve the purpose of DC chopping and output voltage control. Pulse width modulation is a classical switching power supply control technology, which uses PWM wave to control the switch tube, but its circuit is complex and the anti-interference ability of the system is poor. Pulse sequence Control (pulse train,PT) is a new type of switching power supply control technology. Its control circuit is simpler than the classical PWM control circuit, and the anti-jamming ability of the system is stronger. When the PT control technique is applied to the (discontinuous conduction mode,DCM) DC-DC converter with inductance current intermittent operation, the characteristics are good, but the control problem will occur when it is applied to the (continuous conduction mode,CCM) converter in the continuous operation mode, so the PT control converter has insufficient load capacity. To solve this problem, a new type of PT controlled inductor current pseudo-continuous mode (pseudo-continuous conduction mode,PCCM) converter is studied in this paper, which combines the PT control technology with the new circuit topology and effectively improves the load capacity of the converter. The working principle of PCCM converter controlled by PT is introduced in this paper. The simulation work waveform is obtained by using MATLAB software, the hardware circuit based on DSP is designed, and the experimental waveform is obtained, which further proves the relevant conclusions. The main research results of this paper are as follows: (1) theoretical analysis of the load capacity of PT controlled PCCM mode Buck converter. (2) the simulation model of PCCM operating mode DC-DC Buck converter controlled by MATLAB is built by MATLAB, and the simulation experimental waveform is observed. The correctness of the theoretical analysis is proved. (3) according to the principle of simulation model, the hardware circuit based on DSP is designed, and the part of software programming is designed on the platform of CCStudio v3.3. (4) the program is downloaded to the DSP development board by using simulator. The development board is connected with the hardware circuit, and the hardware circuit experiment is carried out. (5) the waveform collected by the hardware circuit is compared with the waveform of the software simulation institute and the conclusion is drawn.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM46

【共引文献】