High-Tc superconducting (HTS) magnets suffer from the intrinsic problem of power loss, and are normally driven by external current sources. The cryogenic heat load incurred by the current leads which link the magnet at cryogenic temperatures and the current source at ambient temperature has been problematic, especially under high current working conditions. It complicates the cooling system, enlarges the weight and footprint of the magnet, and results in high cost.

In recent years, several HTS flux pumps have been proposed and developed. They can energize HTS magnets in a contactless manner, thus eliminating the need for current leads, opening up a way for compact and low cost HTS magnets. Although these flux pumps are successful in maintaining field in a DC magnet, the output voltage, power density, and efficiency of these devices are rather low, making them unsuitable for fast charging/discharging large magnets.

In this talk, we will show our recent progress on HTS rectifiers in Robinson. The rectifiers have high output voltage, high power density, and high efficiency. The talk will include the working principle of these devices, several realizations and performance test result, and an introduction of their potential applications.

Keywords: flux pumps, rectifiers, HTS magnets, Inductive charging