The Implementation Of High Frequency Digital-PWM Controller Based On FPGA

The control technology of power electronic devices is more and more complex with the development of power electronic technology.Switching mode power supply (SMPS) is a significant part of the power electronics,which affects the performance and volume of the electronic equipment.Higher frequency,modular construction and digitalization are the main development tendency in the field of the switching power supply.The performance of the control system depends on the performance of MCU (Micro Control Unit).Nowadays,MCU/DSPs are used as the core in control modules of digital power electronic devices,the discrete operation and control are implemented by software.In many application fields of high frequency,the speed of the controllers which are widely used at present(such as high performance single chip or DSP) can't meet the needs.Compared with MCU and DSP,the CPLD/FPGA devices possess higher speed,which can simplify the system structure,implement high speed algorithm and higher performance/price ratio.Keeping in mind of the FPGAs' advantages,this thesis applies it in power electronic control technology to meet the needs of some real-time application.A novel high-precision digital-PWM DC/DC converter's controller is designed which is implemented by a chip of the Field Programmable Gate Array(FPGA).The functions and the implementations of digital A/D converter,digital PI controller and digital PWM are introduced.Hybrid PWM method is particularly described to realize the high-resolution and high-precision digital PWM design.Simulation and actual wave for every module are carried out.The internal high performance of FPGAs and the application advantage are proved in power electronic control.