An energy-saving pulsed magnetic field generator with multi-stage adjustable magnetic field change rate

The pulsed magnetic field generator can be used in transcranial magnetic stimulation and tumour therapy, etc. In order to further optimize the output performance of the conventional pulsed magnetic field generator, this paper proposes an energy-saving pulsed magnetic field generator based on Marx, the energy efficient pulse source (EEPS) with an energy-feedback circuit structure, which can be used to achieve the recovery of the energy at the load end by means of commutation, to be conducive to the energy-saving of the system and a high-frequency-heavy output. In addition, the magnetic field change rate of the generator output can be flexibly adjusted through the cascade of discharge modules combined with the control of the switch on-time sequence of each level to achieve the adjustment of the output waveform. the adjustment of the pulsed magnetic field duration and the operating frequency can be achieved through the switch on-time and the switching frequency. In order to analyse the output performance of the generator and the energy recovery efficiency of the system, we constructed a two-stage EEPS platform and selected a multi-turn solenoid coil, which is commonly used in biomedical applications, to carry out the study. we tested the topology’s ability to regulate the rate of change of the magnetic field by outputting pulsed magnetic fields in the form of triangular waveforms and exponential waveforms, and achieved a maximum of four levels of adjustability of the rate of change of the magnetic field, as well as the generation of pulsed magnetic field of amplitude as high as 1 T in the target location. magnetic field at the target location. The energy saving rate and self-loss rate of the system were measured based on the triangular wave output mode, and we found that the energy recovery efficiency of the system gradually increased with the increase of current. Therefore, the EEPS shows great potential for application in areas such as magnetic piercing and transcranial magnetic stimulation.