Study On Digital Natural Sampling SPWM Generator Based On FPGA

Because power electronic equipments can produce notable economic performance, it has been applied in many fields. In order to meet power energy's transformation control of different applied situation, the controller of power electronics equip must be versatile and flexible.The controller based Single Chip Micyoco and tiny controller gradually cannot meet the needs to power electronic equipments, because they have so many inherent weaknesses such as weak flexibility, low precision and anti-disturb etc. But Field Programmable Gate Array (FPGA) has the advantage of high-integration, better real-time and short period etc. With the rapid development of FPGA currently, analog control technique will gradually be substituted by digital control technique in the field of controlling power electronic equipments.Pulse-Width Modulation (PWM) technique is an important part of power electronic technique, and sinusoidal PWM (SPWM) technique is most wide applied which can enhance power electronic equipment's performance. Firstly, the principle of SPWM technique is introduced and the digitization of natural sampling based SPWM is discussed. Then the process in realizing the function of digital natural sampling pulse generation based SPWM and the auxiliary pulse proceeding by FPGA is pressed in detail. All of the modules of pulse generator are designed by VHDL and compiled and synthesized and implemented and simulated by ISE6.2 software. The simulating outputs reveal that the circuits designed in this paper are fitful for the requirement of the functions we need. The operating frequency and the dead area time and minimum on and off time can be modulated by different requirements, and the designation of the pulse generating module based SPWM and auxiliary pulse proceeding module as IP cores can be transplanted. Finally the controlling function of pulse generator achieved by DSP is introduced, thelink of pulse generator and controller is simple and each can work respectively. Simulation and test prove all module's validity.