| In recent years,with the rapid development of global electronic information industry, DC-DC switching converter is widely used in the areas of the national defense and civilian electronic industry.With the development of semiconductor manufacturing process , the portable , high-integrated and low power electronic products get more and more widely used, which brings higher demands on power module. A DC-DC converter with smaller size, lower power consumption and higher performance is needed to provide power supply for portable equipments.Therefore,the research on DC-DC switching converter has important practical significance. Meanwhile,compared with the traditional analog methods,digital control method greatly improves the flexibility and reliability of power converter, and provides the ability to monitor, process and adapt to system conditions. The performance of digital control converter is no more determined by massive discrete components' parameters, but determined by digital control software and control algorithm, which means the decrease of cost and volume of power converter, and it can realize more complex algorithms. Digital DC-DC converter can adapt to the requirements of electronic equipment well in different conditions. So, the research on digital DC-DC converter also becomes important.Modeling analysis of DC-DC converter is the key step to study,analyze and design the topologic structures and controlling method.This paper also introduces the model and analysis of analog and digital DC-DC Buck switching converter. In this paper,the modeling and analysis of DC-DC switching converter is introduced,which is helpful to improve the performance of switching power supply and improve the design efficiency.An improved compensation algorithm applied in DC-DC converter is proposed in this paper. The proposition of the algorithm is based on changing the relative value of saw tooth signal adaptively according to the value of output voltage,making the ramp signal moving up and down, thus making duty cycle varies from 0 to 100% rapidly.Based on this theory, the paper enhances transient response by changing compensation function adaptively, which achieves simpler circuit structure and lower power consumption. This algorithm can be used to improve the compensation circuit of analog DC-DC converter, at the same time, it can be used in the digital DC-DC switching converter PID control algorithm to achieve better transient response speed.Through the simulation of analog and digital DC-DC converter by Matlab shows that the transient response time is reduced by ten times by this algorithm. |
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