The Research Of High Power Factor Correction And Soft Switching Inverter

In recent years, with the rising of frequency and power, the traditional inverter shows some defects at two aspects, which is low power factor and high energy loss. The paper presents a novel main circuit which is composed of power factor correction and soft switching technology. It can not only improve the grid pollution but also reduce the energy loss.The paper analyzes in detail the principle, circuit structure, work process and control of the choosen circuit. Power factor correction in main circuit is used of three phase two switch PFC circuit, which is added with two switches.The structure is simple and is working in double close-loop control, which is current loop and voltage loop. It improves the power factor of the grid under control of CCM mode and provides a stable voltage for the back-end as well. Soft switching is used of resonant DC link PWM inverter which is composed of three subswitches and resonant inductance and capacitance. The paper discusses the ZVT process of inverter bridge in the point of SVPWM. The main switch is turned on under the condition of ZVS through resonance.The characteristics of circuit is easy to control and is satisfied with different kinds of PWM mode. In addition, all the switch is working under the condition of soft switching.On the basis of theoretical analysis, the paper presents simulation and experiment to improve its feasibility. Simulating is in order to improve the compatibility, stability and loading capacity. The result strongly improves the conclusion:The system is independent with each other and EMI is low. The power factor is close to 1 and THD is 10.42%. In addition, the paper also states the control chat which is controlled by DSP2407, including hardware and software. The strong ability has been proved to test with inductive loads through soft simulation. Researching on the result of the experiment, the circuit provide high power factor and the direct current generatrix voltage can be controlled. The waveforms of current and voltage are smooth and the aberrance is small. The whole system effectively reduces the harmonic pollution, energy loss and improves the efficiency as well.