Simulation and measurement of electromagnetic interference in a pulsed supply of high power laser

Conventional methods for electromagnetic compatibility (EMC) design of high power supplies are mostly based on experience. It can not insure the stability and reliability of the supply. A method was proposed to quantitatively analyse the electromagnetic interference (EMI) according to the main structure of the supply. The conductive interference of the supply was simulated and measured in a practical supply, and the ground potential difference is less than 10 V (corresponding to unit of the enclosure). The quasi- static magnetic field as well as shielding efficiency is calculated, and the magnetic field outside the supply is less than 0.16×10-4 T. The results of both calculation and measurement indicate that performance of EMC of the supply can measure up to the design criterion.