An All-Solid-State Rectangular Current Pulse Generator Based on Coupling Inductor

To explore the application of pulsed current in biomedicine, an all-solid-state rectangular pulse current generator (RCPG) is proposed. The RCPG uses a field programmable gate array (FPGA) as the control system and a solid-state semiconductor switching metal–oxide–semiconductor field-effect transistor (MOSFET) as the control switch. The RCPG is modular in design, with each module consisting of a diode, a switch, and a coupled inductor. Each inductor of the RCPG is coupled to each other, increasing the energy storage density of the system. When the switch is on, the inductors are charged in series. And when the switch is off, the inductors are discharged in parallel to the load. The energy on the inductor can be superimposed on the load in the form of a current. Through simulation, the principle of RCPG topology and its feasibility is verified. Finally, a five-stage RCPG miniaturized prototype was developed. The experiments show that the RCPG can be adjusted by adjusting the inductor parameters to meet different load requirements, such as biomedical. In addition, the number of modules can be increased to achieve higher current output.