Research And Design Of Single-phase Inverter Power Based On Frequency-hopping Spread Spectrum Modulation

In recent years, with the rapid development of power electronics technology, the inverter power is widely used in various industries. Meanwhile, users have higher quality requirement of output waveform, good dynamic performance and high steady state accuracy. Apart from it, the inevitable trend is that the high-powered three-phase power is transforming to the form of multiple small single-phase powers in parallel. Therefore, it has important significance and practical value in the study on single-power with performance of simple structure with good dynamic and static indication.Firstly, this paper describes the current trend on the development of inverter power. Through the analysis of single-phase inverter circuit theory, mathematical model of inverter power is established. At the same time, a detailed analysis of continuous-time state space model is carried on. Through the study on the SPWM modulation of the single-phase inverter power supply, Frequency-hopping spread spectrum modulation is proposed to improve the EMI performance of inverter. Then, based on the introduction of current commonest inverter control algorithm, multiple-loop control algorithm based on the instantaneous voltage feedback value is adopted in the paper, which has good dynamic and static indication as well as strong load adaptability. Special software Simulink is used to simulate inverter control system. Through the simulation with different load under the control algorithm and comparison of simulation results, this control algorithm proves its high-quality performance.At last, FPGA is designed as core hardware circuit,including power circuit, main control circuit, power supply circuit, and A/D circuit, which is met design requirement by analysis of study outputs.