Design Of Variable Frequency Power Supply Based On SOPC

From the last several decades of the 20th century, the technology of micro-electronics developed so rapidly that the previous electrical system formed by many separated chips can be integrated on one chip, forming SOC (System on Chip). The SOC can make different functions together, such as signal sampling and processing, input and output, and so on. Nowadays, the design of electrical system is changing from PCB level to ASIC or FPGA, which is called SOPC(System on Programmable Chip). The SOPC design, based on IP Core, uses hardware description language as main method and EDA tools as associated method.In the traditional power system, the control part depends on analog signal. Although micro-processors are often used in inverted power module, the main function of micro-processors only include producing sine wave, controlling the on and off state, protecting and displaying because of its speed, so the inverter ,which is the core of inverted power still needs analog circuit to fulfill, resulting high cost ,low precision and low flexibility.This project is based on SOPC system, using the FPGA(Cyclone II) made by Altera Corporation as the main controller. The functions of SPWM, UART, LCD are developed by the hardware description language Verilog HDL. The Nios II core uses C programming language. These new methods make the whole system more flexible and more effective.The various-frequency power is controller by digital signal, so has the strength of high precision and better stableness. The frequency ranges from 20.0Hz to 100.0Hz, with the precision of 0.1Hz. The amplitude ranges from 10% to 100%, with the precision of 1%. According to actual test, the system is reliable.