Abstract：Compared with conventional asymmetrical half-bridge convertor topology, the 2(n+1) converter topology has decreased the number of power devices by one quarter, by which it could effectively decrease the volume of power converter and the cost. Meanwhile, 2(n+1) converter topology also has kept the advantages of asymmetrical half-bridge topology such as flexible control and high independence between phases. However, due to the shared upper switch of two phases, the 2(n+1) converter topology has some problems during the demagnetization period which appear obviously in high-speed state such as slow demagnetization speed and abnormal current rising. This paper has analyzed these problems and proposed a new control strategy of demagnetization acceleration, which could speed up the demagnetization and prevent the abnormal current rising. By superimpose PWM signals into the drive signal of the shared upper switches, this control strategy has effectively increased the terminal equivalent voltage of demagnetization phase and ensured that demagnetization phase current drops to zero before the beginning of the next cycle. A Matlab/Simulink model for a Four-Phase 8/6 SRM was established, and the effectiveness of proposed strategy was verified through simulation. At the end, the experimental platform was set up to verify the feasibility and superiority of the control strategy.
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2019, Vol. 34 
