超低场磁共振车载便携梯度功率放大器设计

Magnetic Resonance Imaging (MRI) is a medical imaging diagnostic method with broad application prospects. Diagnosis provides rich imaging information. Portable MRI mobile diagnostic equipment has gradually become an important development direction in the medical field. Ultra-low-field NMR can reduce the difficulty of designing and manufacturing equipment magnet subsystems. It is small in size, light and flexible, and has shown great application potential in scientific research and clinical diagnosis. Gradient power amplifier is an indispensable part of portable magnetic resonance imaging system, and its volume and weight also need to be minimized. In this paper, a minimalist and ultra-light gradient based on "FPGA + adaptive PID" control is developed. The power amplifier has a tracking rise/fall time of about 200us, the maximum output current can reach 80A, the volume is reduced to 150mm*170mm*70mm, the size is only half the size of A4 paper, and the weight is only 1kg. The designed gradient power amplifier meets the design specifications.?????