The Research Of Three-phase Actively Clamped Resonant Rectifier Base On SiC Mosfet

Three-phase PWM rectifier,as AC to DC power conversion device,has a wide application background in industrial production,and using high switching frequency device has became the future tendency.With the development of third generation semi-band-gap material Si C,Si C MOSFET has been commercialized.The excellent high frequency characteristics of Si C MOSFET make rectifier high frequency technology become possible.And in order to reduce the switching dissipation at high frequency,this paper use the three-phase actively clamp resonant DC link Si C rectifier to implement soft switching technique.The current application research of Si C MOSFET and the development of resonant DC link converter is introduced in this paper.This paper illustrates the advantages of actively clamp resonant DC link converter.The operating principle and power dissipation model of three-phase actively clamp resonant DC link rectifier are analyzed by using physics.Based on the characteristics of the topology,the deficiencies of the existing modulation methods are analyzed,which can be improved by introducing correction of the current direction.Using the resonance parameters which calculated by Analysing the processes of the resonant to manufacture an experiment prototype of actively clamp resonant DC link rectifier.And analysed the power dissipation of actively clamp resonant DC link rectifier in various scenarios.An actively clamp resonant DC link rectifier experimental platform is designed.Using DSP+FPGA as main control chip to design the digital control system scheme and Si C MOSFET is used as power module of rectifier.DSP is used to voltage sampling and control the closed loop of voltage and current.FPGA is used to current sampling and update PWM value.A simulation model based on 5k W experimental prototype parameters is built,which is controlled by grid voltage vector.The experimental results show that the active clamp DC resonant rectifier achieves zero-voltage on-off of the full switches.According to the above experimental results,the power consumption of soft-on rectifier is compared with that of hardswitch rectifier,which proves the superior efficiency of the proposed method in energy saving.