A Novel Trigger Method for Reversely Switched Dynistor to Eliminate Residual Voltage in Submicrosecond Pulse Range

In this article, a novel trigger method for reversely switched dynistor (RSD) is proposed to eliminate the residual voltage when it switches current with submicrosecond rise time. Transient characteristics of RSD triggered by conventional reverse current pulse and proposed d
v
/d
t
voltage pulse are compared in the simulations. Under conventional trigger method, it takes tens of nanoseconds to arise regenerative feedback because of the low electric field in N base region. Besides, this time presents nonmonotonic trend as the N base thickens under the same triggering condition. Because of the electric field intensity over 10 V/
μ
m when RSD is triggered by d
v
/d
t
voltage pulse, the carriers could drift through N base region with almost saturated velocity, contributing to the occurrence of regenerative feedback within several nanoseconds. As a result, RSD could switch current pulse with submicrosecond rise time without residual voltage. As the width of N base increases, the time to arise regenerative feedback grows monotonically. The advantage of the proposed d
v
/d
t
trigger method is verified by experiments. The switching loss of RSD triggered by conventional method is three times higher than that of RSD triggered by proposed method under the same condition. With a d
v
/d
t
voltage pulse of 200 V/ns providing for RSD, it can switch current pulse with d
i
/d
t
over 5 kA/
μ
s when the rise time is 150 ns without residual voltage. The proposed trigger method could broaden the application range of RSD.