A Novel Design of Multilevel Repetitive Pulse Magnetic Field System

To simulate the device condition in practical applications, the repetitive operation capability and the flexibility to adjust the pulse are required. In this paper, a RPMF system in consideration of both the coil structure and the power supply topology is proposed to better achieve above requirements. Firstly, by using Particle Swarm Optimization (PSO) and Posterior Analytic Hierarchy Process (AHP), the coil structure is optimized to trade off the equipment size and temperature rise. Moreover, this design realizes the innovation on power supply topology. Featuring with a semi-controlled bridge converter, the proposed topology allows for adjustment of the pulse amplitude, width, and interval according to test requirement, and it exploits a steepening capacitor to shorten edge time. In addition, the proposed power supply achieves capacitor energy regulation without additional charging circuit by utilizing the parasitic oscillation. A scaled down prototype has been tested to produce three typical RPMF waveforms from 10 A to 80 A with repetitive frequency from 40 Hz to 50 Hz. Experimental results show the repetitive operation ability and the adjustability of multilevel RPMF system.