SUPERCONDUCTING KEY Russian patent published in 1995 - IPC

FIELD: cryogenic installations. SUBSTANCE: superconducting key has first current-carrying element in parallel to which protective resistor and additional control section and second current carrying element coupled in series are connected. Additional control section is linked to device for control over phase state. Superconducting key has first and second compensating amplifiers and first and second differential amplifiers. First lead of additional section is connected to first inputs of compensating amplifiers which second inputs are grounded. Second lead of additional section is connected to first lead of protective resistor. Outputs of first and second compensating amplifiers are coupled correspondingly to first input of first differential amplifier and to first input of second differential amplifier. Second lead of protective resistor, second inputs of differential amplifiers, second leads of current-carrying elements are integrated. Leads-out of differential amplifiers are connected to input of control device. EFFECT: enhanced operational efficiency and reliability. 1 dwg