Electronic – Switching high voltage with consistent risetime

compliancehigh frequencyhigh voltageswitches

I'm trying to design an IEC61000-4-4 compliant EFT generator for in-house use, which is based on following schematic: basic schematic

I've been able to determine all values for all components, And I've been able to generate a wave which meets the specifications

rise time 5ns +- 30%;
duration time (to 50%) = 50ns +- 30%;
Vpeak = 1000V +- 10%

I've accomplished this using 4 avalanche transistors in series, with base and emitter connected, and the last transistor triggered with a 1:1 transformer:
enter image description here

The problem with this method is that I cannot vary the voltage from 0V to 4kV, as the avalanche circuit only works for a certain voltage range.

As I would like to make the output voltage variable from 0v to 4kV, I am looking for another way to implement the switch. It needs to switch within 5ns.

If anyone has an idea on how to do this, thanks in advance.

Best Answer

You might want to examine the following publication, LOW COST IEC61000-4-4 COMPATIBLE PULSE GENERATOR, which has some practical elements.

enter image description here

The developed switch stack uses four STP4N150 power MOSFETs.

EDIT: some theory behind the switch design can be found here.

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