Automatic Generation of Gate Driving Vectors for Digital Gate Drivers to Satisfy EMI Regulations

To reduce the development period of power electronics equipment to satisfy EMI regulations, an automatic generation method of gate driving vectors (AGGV) for the digital gate drivers is proposed. In the proposed AGGV, the frequency spectrum of the V CE waveform of IGBT is compared with the EMI limit and the gate driving vectors are automatically searched using a simulated annealing algorithm to meet the EMI limit and to minimize the switching loss. In the switching measurement of IGBT at 20 A and 300 V and a given EMI limit, compared with the conventional single step gate driving, the proposed digital gate driving reduces the switching loss by 22 %. An EMI reduction using the proposed digital gate driving, which cannot be achieved by the conventional single step gate driving, is also demonstrated.