Anomalous overvoltage oscillations in the reverse recovery of power p-i-n diodes: experiments and simulations
نویسنده
چکیده
Modern power converters frequently require snubberless operation of p-i-n diodes [1]. Due to the presence of fast-switching components, like last-generation GTOs and IGBTs, the diodes must be able to withstand, at turn-off, quick inductive switching, i.e., large, negative time derivatives of the diode current ((dID/dt)1<0) without large overvoltages, which requires a limited time derivative ((dID/dt)2) at the end of the reverse recovery transient (the so-called soft recovery) [2]. With reference to a simple inductive switching arrangement, Fig. 1 shows that the peak overvoltage measured on the diode (VPK) is:
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