PWMインバータの短絡電流抑制と損失評価

概要

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Because of the recent development of the high-speed self-quenching types semiconducter valve devices, the PWM inverters come to have the features of low-noise, small size and light weight. This also has brought some other serious problems.The paper firstly describes the soft gate-drive and the two-step base-drive methods which can suppress the instantaneous short-circuit-sure current by the storage carriers of the feedback diode, which has been one of the serious phenomena of the converters with high-frequency switching scheme. Secondly we consider the power dissipation caused by the high-frequency operation, based on the estimation method derived from the measurement of the switching waveform, then it has been clarified for the power dissipation how to depend on the carrier frequency and the load power-factor. Finally various gate control sequences which have been announced so far are examined from the viewpoints of the losses, and considerations are made on the frequency criterion and the efficiency improvement.
社団法人電気学会の論文