Research On A High Frequency AC Stable Power Supply With APFC Circuit

We research a high frequency AC stable power supply contains APFC in this task.First of all, we emphatically analyze the constitution of this power supply, and analyze the main circuit of the first stage rectifier, discuss the typical circuit of the normal power supply. But for the low power ones, using the diodes rectifier added DC/DC circuit to change the output voltage and improve the input power factor is a good way. So this task adopts this circuit and then gives it in de follow discussion. Second, the inverter is the most important part in this power supply. In this task we adopt the three-phase bridge circuit, we can use fewer components and also the corresponding the driver circuit can be designed simply. So it is widely used in the three-phase inverter. For the power MOSFET, the driver circuit is very important. The better driver circuit can eliminate the disturbance; avoid the switch being on when it is no the time; reduce the switching time and switching wastage, prove the switch frequency. At last, we analyze the importance of the carious protection circuit for the power supply.This paper analyze the fundamental principle of the APFC circuit,and give out the circuit sketch map under the control mode with serial inductance current. We divide the APFC circuit into two parts, main power circuit and control circuit, and then analyze them respectively. After get the parameter of the model, we do some simulation in the MATLAB/Simulink, and get the conclusion.In recent years the researches for high performance PWM inverter are taken more attention, and various waveform correction techniques have been proposed. And this paper emphatically analyzes the inverter with voltage and current dual-loop control based on pole-assignment. First of all, we establish the continuous mathematical models of a single-phase PWM inverter. Then we give out the block diagram of the single phase inverter's main circuit. We analyze the design method of the inverter with single loop PID controller based on pole-assignment, following we do the simulation to approve it. At last, we discuss the inverter with voltage and current dual-loop control based on pole-assignment. From the simulation we can see that using this control method can obviously improve the dynamic performance of the inverter, and also can improve has good performance with non-linear load.