Design of Current Ripple Measurement System for Highly Stabilized Magnet Power Supply

Water-cooled resistive high-field magnets require a high power supply with an extremely high current stability, and a low current ripple and noise. Because of the extremely low current ripple and the high electromagnetic interference environment generated by high-power switching devices, the traditional measurement methods can not measure the current ripple of the highly stabilized power supply. In this paper, a new current ripple measurement method and system are designed. The system uses the peak-up coil to measure the magnetic field ripple, uses digital filters, digital integrators and software programs to calculate and process the output signal of the peak-up coil, and then obtains the current ripple waveform and spectrum analysis data, which solves the problem that the current ripple of the highly stabilized magnet power supply cannot be directly measured.