| 摘要 |
887,653. Super-conductor circuits. INTERNATIONAL BUSINESS MACHINES CORPORATION. Dec. 18, 1958 [Dec. 23, 1957], No. 40891/58. Class 37. [Also in Group XXXIX] The control winding of a cryotron forms part of a super-conductor loop circuit. The loops are used in bi-stable circuit arrangements (see Group XXXIX) Niobium and lead control conductors may be used respectively with tantalum and tin gate conductors. In a loop 30, the control winding C3b of cryotron G3 is connected in series with the gate conductor of cryotron G5 and with a superconductor segment 34 of " soft " material which is driven resistive by a magnetic field of low intensity. A drive line 36 includes a segment 38 adjacent the segment 34. A winding C3a carries a biasing current insufficient to drive G3 resistive. A drive pulse in line 36 induces a current il in one direction round the loop until the current drives segment 34 resistive and links magnetic flux with the loop. The pulse decays slowly until 34 again becomes superconducting, the linked flux is trapped and, when the pulse ends a persistent current i2 remains in the opposite direction. The magnitude and direction of the bias current in C3a is such that the bias and the persistent current i2 together drive the cryotron G3 resistive. The current il is opposed to the bias and has no effect. If cryotron G5 is driven resistive by control winding C5, the persistent current is dissipated and G3 conducts again. Specifications 666,883, 861,280, 862,178 and 887,652 are referred to.
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