Modeling And Stability Research Of BOOST Converter System

In many types of portable electronic equipment, lithium batteries are used for power supply circuits. Input voltage of single standard lithium battery is 3.6V, and portable electronic devices are often worth more than the high-voltage requirements, such as color LCD display of mobile phone, PDA, and the lights of digital cameras. In order not to increase the number of batteries, and to meet the demands of high input voltage of portable electronic products, BOOST converter is a good option.However, the research of BOOST converter system and its'system stability in our country is confined to reverse or SPEC level, rarely from the research and design of system. The purpose of this paper is to research stability for BOOST converter from the point of view of model, improve the existing methods of stability and give simulation.In this paper, firstly, the modeling method and design specifications of control loop are introduced. Secondly, the method is used to construct the model of BOOST converter, including steady-state and small signal. Next, different control mode is proposed, and the model of voltage mode PWM control loop is constructed, also makes a detailed analysis of every part's transform function for this loop. On this basis, system stability of BOOST converter using voltage mode PWM loop is analyzed and improved method is also proposed in frequency zone. Finally, sets system parameters of BOOST converter, and simulates the proposed method. The simulation results with matlab show that this method has good stability for system loop.