US Patent 11415651 Low noise gradient amplification components for MR systems

Described herein are power components that may facilitate efficient, low noise operation of low-field MRI systems. In some embodiments, the power components may include switching power converters configured to switch in a manner that reduces or eliminates noise within a desired frequency band (e.g., the Larmor frequency band) due to harmonics of the switching frequency. For example, the desired frequency band may be positioned between adjacent integer harmonics of the switching frequency. In some embodiments, harmonic components generated by multiple switching power converters may destructively interfere with one another, reducing or eliminating the amplitude of the harmonic components of the switching frequency that reside in the desired frequency band. In some embodiments, the power components may include switching power converters configured in parallel without the need for active current balancing circuitry.