Abstract
The switching harmonics generated by the on-off and off of the switching tube of the chopper-controlled magnet power supply will affect the control accuracy of the magnet power supply for the particle beam current. The switching harmonics are mainly concentrated near the switching frequency and its sideband. In order to effectively suppress the switching frequency and sideband harmonics, three passive filters are studied. The three passive filters are based on BUCK buck circuit, and the harmonic bypass effect of switching frequency and sideband frequency is achieved by low-pass filtering and series resonance, thereby reducing the amplitude of load current ripple. The simulation results show that the designed three passive filters have good suppression effects on the switching frequency and sideband harmonics.
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