EHT Modulated Coil Driver with 40 kA Pulse Width at 10 ms

EHT has developed a solution for driving a 40 kA current yet maintaining a flat top for 10 ms in an electromagnetic coil. In order to minimize the ripple on the coil, the circuit pulse width modulates at 100 kHz.

Each integrated power module (IPM) was tested at 2.5 kA/IPM. High current operation is demonstrated at 100 kHz. The voltage across the switch decreases over the course of the shot due to energy being drained from the capacitor bank. Current measured with a Rogowski coil and EHT Integrator. The current graph changes shape when the pulse width is changed during the shot.