The development of power supply technology is the key to improve the on-line monitoring device which ensures the reliability and intelligence of power grid. In this paper, a design scheme of inductive power supply for on-line monitoring device is proposed. The AC/DC converter circuit without rectifier bridge and the black-start circuit are designed. The control module uses the backup battery to solve the problem of insufficient power supply and control strategy adopts the principle of MPPT. The validity of scheme is verified by testing the prototype. Test results shows that prototype can not only work in a wide current range of line current and load but also work at maximum power point and change the working mode following the change of load and line current.
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