Patent GB-882230-A (GB)
Title: A pulse-responsive control circuit
IPC: H03K3/45
Filed: 1957-11-29
Abstract: 882,230. Circuits employing bi-stable magrietic and dielectric elements. NIPPON TELEGRAPH & TELEPHONE PUBLIC CORPORATION. Nov. 29, 1957 [Nov. 30, 1956 ; Dec. 4, 1956], No. 37352/57. Class 40 (9). Saturable capacitors having rectangular hysteresis characteristics are connected in series with windings on magnetic cores to terminals P, Q and R, and positive pulses are applied alternately from P to R and from R to Q. In the arrangements shown in Figs. 2 and 3, the magnetic cores M have either rectangular hysteresis characteristics or have characteristics of the form shown in Fig. 1b In the latter case the cores are biased to h and present high or low reactance depending on their quiescent state K or H, the two quiescent states effectively corresponding to the discrete remanent states of cores with rectangular hysteresis characteristics. In the remaining embodiments, transformers having conventional cores are employed. Trigger pairs. In one arrangement, Fig. 2, biased or remanent cores M1, M2 are connected by windings and circuits α1, α2, B1 B2 to saturable capacitors C1, C2. Both capacitors are initially polarized in the same upward direction while the cores are in opposite quiescent states. In operation, a positive current pulse applied to terminal P passes through the circuit α1 associated with the low reactance core M1 and reverses the polarization of C1. The next positive pulse is applied to terminal R and passes through circuit B1 to terminal Q, thereby restoring the polarization of C1 to its initial direction and changing over the quiescent states of both M1 and M2. The next pair of pulses then act in circuits α2, B2 on capacitor C2 and so on. A second embodiment is described, Fig. 4, in which M1, M2 are transformers, the secondary windings of which are connected to saturable capacitors T1, T2. In this arrangement all the capacitors C1, C2, T1 are initially polarized upwards, while capacitor T2 is polarized downwards and so establishes a high impedance state in the primary winding of core M2 to a pulse from P to R. Operation is the same as for Fig. 2. A further embodiment is also described, Fig. 6, in which the capacitors C1 C2 are replaced by transformers L1, L2 having secondary windings connected to saturable capacitors #1, #2. Ring circuits. It is stated that these circuits may be used for scanning, storage or calculation purposes. As shown in Fig. 3, saturable capacitors C1, D1, C2, D2, C3, D3 are connected to terminals P, Q and R by way of windings on cores M1, M2, M3 having two discrete operating states. All the capacitors are initially polarized upwards, while of the cores only M1 has a polarization state which permits a pulse from P to pass to R. This pulse reverses the polarization of both C1 and D1. The next pulse is applied from R to Q and restores C1, D1 and at the same time reverses the states of M1 and M2. The next pulse from P now passes through windings on core M2 as this core alone is in a state such as to present a low impedance. Capacitors C2, D2 reverse and are subsequently restored when a pulse from R passes through them to Q. The states of M2, M3 are then reversed so that the next P pulse acts on C3, D3 and so on. In an alternative arrangement, Figs. 5, transformers M1, M2, M3 each have a saturable capacitor T1, T2, T3 connected in the secondary circuit, while saturable capacitors C1, C2, C3 are shunted by the divided windings of inductors N1, N2, N3. Initially all the capacitors excepting T2 and T3 are polarized upwards so that a low impedance path from terminal P is available only through a winding on M1 The first pulse from P to R reverses T1 and C1 the inductor N1 providing a high impedance across the capacitor C1. The next pulse is from R to Q, and since the divided windings of inductor N1 provide a low impedance path to a winding on M2, capacitor C1 is restored to its initial state and T2 reversed. A winding on M2 next provides a low impedance path to a pulse from P, and T2, C2 are reversed, the operation continuing so as to step along an upward polarization state in the order T3, T1 T2 . . . and so on each time pulses are applied to P and R. It is stated that only one condenser T may be initially polarized downwards, in which case two of the condensers Cl, C2, C3 are affected by each pulse.