Research On DSP Based Digital Control For Power Supply

The development of microprocessor provides a new method for switching mode power supply control - digital control. Digital control has many advantages such as repeatability, durability, adaptability and so on. This thesis focuses on the study, implementation and improvement of a DSP based digital controller.This thesis mainly includes three parts, which are described in detail in chapter 2, chapter 3, and chapter 4 respectively.Chapter 2 introduces the development of DSP chips. There are two kinds of DSP chip used in this thesis - Motorola's DSP56F8323 and TI's TMS320LF2407A. The hardware design of these two DSP chips is described in this chapter and the performance of these two DSP chips is compared at the end of this chapter.Chapter 3 focuses on the digital control of Power Factor Corrector (PFC). First, the damages of low power factor and the importance of PFC are presented. Secondly, the main parts of the hardware are designed and selected. Last, the control-to-output transfer function of Boost PFC converter is found. The parameters of digital adjuster are calculated. Simulink and experiment results prove the correction of the design.Chapter 4 focuses on the theory of Voltage Space Vector Pulse Width Modulation (SVPWM) and its control strategy. A fast space vector modulation algorithm for 3-level 3-phase converter is also described in this chapter. Simulink results prove the correction of the control strategy.