In order to solve the problems of long turn-off time and low charge-discharge frequency in the detection of transient e-lectromagnetic method,this paper studies the fast turn-off and fast charge-discharge technology of transient electromagnetic emission system with small loop and large inductance load.Using passive constant voltage clamp technology of high power TVS in series to re-duce turn-off time and damping absorption resistance to reduce turn-off oscillation,a high power constant voltage fast charging mode was designed,and the relationship between turn-off time and the number of TVS tubes was deduced.The simulation and experimental results show that for the 575 μH load inductor,the peak output current is 230 A,the charging time at 2 ms pulse is 72 ms,and the turn-off time at 9 TVS tubes is 152 μs.It lays a foundation for the transient electromagnetic detection system to reduce the detection blind area and improve the detection ability by multi-pulse accumulation.
维普
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