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Intelligent innovative power supply for superconducting coils
Dr. Andreas Kade
Compact, powerful power supply with 4-quadrant converter
The aim of the R&D project is the development of an intelligent innovative power supply as a 4-quadrant controller and energy storage device, which consists of a communicating system between quench protection and current flow control at the superconductor. The development shall be characterized by safety, compactness, accuracy, user friendliness, good price-performance ratio and modularity. The combination of cryogenic and warm electronics will provide significant advantages.
The functional model developed and constructed for this purpose has the following parameters and properties:
- 4-quadrant power supply with ± 25 V and ± 14 kA
- Constant voltage quench protection system
- Cryogenic switch (cryogenic)
- Energy storage system
The components for the energy storage system consists of individual cells with a capacity of 3000 F and a voltage of 2.7 V. 51 modules are connected in parallel, each with 10 individual cells, to form a capacitor bank. This results in a capacity of 15,300 F and a voltage of 25 V. A 3 kA, 30 V device serves as power supply, which has already been successfully tested on a cryogenic power supply.
In the next step, the configured capacitor modules for the energy storage and the boards of the 4-quadrant controller, see Figure 1, were combined in three switch cabinets, see Figure 2. The completed switch cabinet is shown in Figure 3. First results were presented at the 16th Cryogenics in October 2021.
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Modified Almen-Wieland wear testing machine
Influenced melting point of water by magnetic field
Controlled sub-cooling of products in freezing processes
Investigation of materials
Investigations regarding the compatibility of materials with refrigerants, oils and heat transfer fluids