The superconducting outsert of the 40 T hybrid-magnet in High Magnetic Field Laboratory(HMFL)of Chinese Academy of Sciences(CAS)requires a highly stabilized power supply.In this paper,two kinds of power supply design are briefly presented and both advantages and disadvantages are analyzed.In order to overcome the drawbacks of switching power supply,a series regulated active filter is adopted and a new design is proposed which ensures cooperative relationship between the feedback control loops of the switching converter and the series regulated active filter.Besides,unlike the traditional switching power supply,which can generate positive voltage only,this new design can also generate negative voltage which is needed in the quench protection for the superconducting magnet.In order to demonstrate the effectiveness of the methodology,a low-power prototype has been accomplished.The simulation and experiment results show that the power supply achieves high precision under the combined action of two feedback control loops.The peak-to-peak amplitude of the output ripple voltage of the prototype is 0.063%,while the peak-to-peak amplitude of the output ripple current is 120 ppm.
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