Electromagnets in low-field portable MRI systems offer significant advantages due to their adjustable field strength and superior portability. Nonetheless, the development of the main field amplifier for such systems remains an area with scant research. This digest presents a pulsed magnet system designed for low-field portable MRI applications. Preliminary experiments of the prototype demonstrate the generation of consistent main magnetic field pulses of 27.44 mT by ramping the coil current to 26.5 A within 50 μs.