4.5 kV soft recovery diode with carrier stored structure

In terms of recovery performance, freewheeling high voltage diodes have two problems: low di/dt capability and the oscillation of both anode voltage and anode current. In order to prevent the oscillation, a soft recovery performance is required, but this alone is not sufficient. However, a carrier stored diode with comb-like N/sup +/ structure was thought to minimize the oscillation. This diode produced a recovery performance which was near the theoretically predicted level. Considerations for the triggering of the oscillation and the dynamic characteristics data of the comb-like N/sup +/ diode is presented.