СПОСОБ ФУНКЦИОНИРОВАНИЯ ЭЛЕКТРОННОГО ВЕНТЕЛЯ

摘要

The current applied by driver 12 to charge or discharge the gate of an IGBT is adapted from cycle to cycle in dependence on the response of the IGBT measured at a predetermined instant in each cycle. The unit 16 may measure gate-emitter voltage, collector-emitter voltage, collector current or a derivative. The gate drive is incremented or decremented in each cycle until the switching speed lies within a desired band. Obtaining an optimum switching speed reduces switching losses and prevents shoot-through current. The gate current in distinct phases of the charge or discharge cycle can be adapted independently (figures 3 and 4).