.dc / Dc Converter Structure Control For Dc Motor Speed Control Applications

In this article, two new sliding mode variable structure control (SMVSC) methods are applied to the most typical DC-DC switch converters, Buck converter and Boost converter. In this dissertation, we build up its mathematics modeland the electric circuit really imitate,and compare with traditional method. For explaining its function, as an example,we take Buck converter and whole bridge DC- DC converter into the d.c. motor drop voltage speed regulation control.This article presents a double sliding surface VSC ( variable structure control) method used to Buck converter. It constructs two loops controller, one sliding surface adopts the inductor current as the feedback parameter of the inner loop,and the other sliding surface adopts the capacitance voltage as the outer loop.Through the simulation and compare,we can find this control strategies is better then the single surface VSC.It can obtain more feedback information and better dynamic response,and can be maintained in spite of large input voltage,output current,and even parameter variations(robustness). And it can eliminate chattering effectively and good reduce steady-state errors.This article presents a hybrid control which consists of PI control and SMVSC used to Boost converter.When output error is bigger then threshold value, SMVSC will be selected ,otherwise PI control will be selected.This control strategies has both priorities of controllers..It can obtain more feedback information and better dynamic response,and can be maintained in spite of large input voltage,output current,and even parameter variations(robustness). And it can eliminate chattering effectively and good reduce steady-state errors.This article presents a new control method of d.c. motor drop voltage speed regulation by Buck converter and whole bridge DC- DC converter. It constructs two loops variable structure controller(VSC), one sliding surface adopts the current as the feedback parameter of the inner loop,and the other sliding surface adopts the rotational speed as the outer loop. Through the simulation and compare,we can find this control strategies can obtain smooth infinitely variable speed transmission and the risetime,the...