Research And Realization Of Control For Boost Converter

In the latest years, with the rapid development of power electronic technology, the switching power supply which constructed by DC/DC converter has been applied in every field deeply. Some applications where exist the large signal disturbance demand a high quality of output waveform. In order to resist the large signal disturbance, the research of control scheme for the switching converter becoming a hotspot in the power electric technology field.Based on classical single or double feedback loop theory, the traditional analog controller is hard to guarantee the nonlinear DC/DC converter running with an ideal control performance in case of the large signal disturbance occurs. Comparing with the analog controller, digital controller can be easily realized the complicated nonlinear control strategy which could essentially improve the DC/DC converter controller performance. At present, the maturation of DSP hardware technology make it possible to realize digital controller for DC/DC converter, herewith, in power electronic study field, the study of nonlinear control strategy for DC/DC converter become very pop.Takeing non-ideal CCM Boost convert as research object in this paper, above all, based on the essential quality of switch power converter, which is time-varying and nonlinear, this paper apply the discrete analytics to construct model. Then, the steady state characteristic and the power loss caused by parasitical parameters of non-ideal elements are analysised theoreticly. The primary controller adopts feedforward control strategy based on the principle of power balance. In order to improve the instantaneous performance of large signal, the inductor current error regulatory strategy and output voltage PID regulatory strategy are introduced to the final controller. The simulation results indicate that the controller above presented can make the converter achieve both excellent dynamic and ideal steady characteristics when the large signal disturbance occurs.Finally, takeing DSP2812 as controller platform, the arithmetic of controller is realized by C language programme, and the hardware circuit and controller are linked to test the Closed-loop system. The results show that the controller achieves the desired control effect, and certificates the feasibility of this method.