In the field of motor control, parallelled MOSFET is often used as the power output module in order to pursue the miniaturization of motor controller. Although many characteristics of MOSFET are easy to be used in parallel, the problem of overcurrent caused by the inconsistency of switching process has not been solved fundamentally. In this paper, the current state of the power device applied to the SVPWM electronic control algorithm at the moment of commutation is analyzed in detail. The problem of power device switching inconsistencies is solved under the general topology, which makes the current transition smoothly in the body-diode and forward FET circulation. After these, the parallel characteristics of non-commutation time are optimized according to the interaction characteristics of zero-vector and non-zero vector. The significant effect of the scheme is proved by the comparison of experimental waveform results and temperature rise. This scheme provides strong support for the application of parallel MOSFET in motor control field.

Parallelled MOSFETs,Freewheel diode,SVPWM,Zero voltage vector,Temperature rise characteristic