Research And Design Of Boost Chopper Converter

Recently, with the rapid development of information industry, the further reconstruction of traditional industry, and the continuing demands of energy saving, the market of chopper power is expanding. In the further, the direction of power supply development is deem to become more intelligent,higher frequency and lighter. Therefore, research on modeling of power supply and control technique is valuable not only in economy but also in research.Firstly, the paper will present a comprehensive introduction about the development of DC-DC converter in and aboard. Because the power supply is complex power electronic equipment combined of power electronic and electronics. The traditional research method is not only exhausting a mount of human time,property and time-consuming, but also some problems can not be solved. In consequently, it is used to take simulation technique and optimize parameters before the circuit is constructed. To finish the simulation we must have the mathematical model of the circuit. Small signal modeling method has been introduce to DC-DC converter. Based on this model, the simulation circuit has been set up in PSpice environment and the simulation result is obtained. Compared with the result of the analyzed resolution, The model is verified by the result, and it paves the way for further design of the controller .Because of the higher non-linear,multiply mode of soft-switching power supply operation principle, it's always difficult to get its mathematical model. The discrete mapping method is introduced in this paper, and it can make contribution to modeling the non-linear soft-switching converter. The mathematical model of Boost ZVS MRC is established by applying this method, at the same time, the simulation results have been got, while its result is the same to the analytical simulation results.The chapter of hardware design has discussed how to design the key part of Boost converter, especially the EMI filter and the controller. Because of the high frequency of the Boost system, the higher frequency harmonious waves including the eradiate EMI can be produced by the high frequency pulse. The EMI has affect on the performance of the Boost system. The typical conductive interference (including the common-mode and different-mode) has been researched. As the transfer function of the open-loop Boost power supply is the non-minimum phase system, the two-loop control systems has been adopted after analyze the character of the system. The two loops are that the internal loop is current-loop and the external loop is voltage-loop, and current peak control mode has been adopted in the current-loop. Based on the open loop model, taking the requirement of system stability and dynamic performance into account, the system is adjusted so as to the performance of system is agreed with the requirement. Finally, a chopper converter has been constructed, and its output power can reach 100W, and its performance achieves the requirements.