推挽正激式高频环节逆变器研究(3)

推挽正激式高频环节逆变器研究

ABSTRACT

The inverter has smaller and lighter transformer and filter with high frequency switching，but high frequency switching brings high switching loss and EMI．The inverter with high frequency pulse DC link can reduce switching loss and EMI by soft switching，but it doesn't increase complexity of the circuit topology．

A high frequency link Push Pull Forward(PPF) type inverter is proposed in this paper，which have the advantages of the Push-Pull DC converter and the high pulse DC link inverter．Comparing with several other control methods，SPWM control method can simplify design of filter circuit，reduce the bulk of filter in the high frequency link Push Pull Forward type inverter．It also reduces numbers of power MOSFET switching，then reduces switching loss and improves efficiency of the inverter．Comparing a high frequency link Push Pull Forward type inverter of hystersis current control，a high frequency link Push Pull Forward type inverter of SPWM control can reduce harmonic voltage and simply filter design．Thus there are many advantages in the high frequency link Push Pull Forward type inverter with SPWM control method，as the inverter can support bigger inputting current and has lower switching cost and smaller filter．

The technique of designing the inverter is offered after analyzing principle of the inverter in this paper．Using the given technique of design and the SPWM control method，the theory analysis about the inverter is proved correct．The experimental results show that the inverter have advantages of lower switching cost and smaller filter．

Key Words：Inverter，High Frequency Link，SPWM，Push Pull Forward，Soft

Switching

II

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