The reliability of online monitoring equipment has a high demand on the performance of power supply. To improve the power supply performance of the drawout power

we designed a set of TA power supply based on the passive components. In order to solve the problem that the TA power supply is difficult to consider high efficiency and saturation simultaneously

nanocrystal line alloys with high permeability were selected as core materials. Based on theoretical analysis and simulation study

the influences of turns number and load impedance on power acquisition efficiency were studied.Meanwhile

current discharge circuit made of Schottky diodes were applied in the power supply to suppress core saturation. The rectifier bridge and DC-DC module were used to stabilize and smooth the DC output voltage. The reasonable power source device was designed through electromagnetic-thermal coupling calculation and test. The proposed power supply can offer more than 1.5 W power while the current value of line is within range of 17 A to 1 100 A.