Improvements relating to electrical circuit arrangements utilising ferromagnetic cores

摘要

824,190. Circuits employing multi-stable magnetic elements. GENERAL ELECTRIC CO. June 1, 1956 [June 1, 1955], No. 17010/56. Class 40 (9). [Also in Group XIX] A counting circuit with automatic reset comprises a ferromagnetic core 10 having a winding 12 in series with a resistor 21 and a winding 14 in series with a capacitor 24 connected in parallel across terminals 17 and 18 to which pulses are applied. The voltage and time duration of the pulses is such that a given number of pulses is required to take the core from a given initial stable state to saturation. While the core is being moved towards saturation only a small voltage is developed across resistor 21 and an analysis of the circuit is given to show that, by suitable choice of components and in particular by making the number of turns of winding 12 less than the number of turns of winding 14, this small voltage need not produce an output across condenser 24 following the end of an input pulse. When the core is saturated, a pulse generates a voltage across resistor 21 sufficient to charge condenser 24 which discharges on termination of the pulse and is such as to reset the core to its initial stable state. The initial stable state may be reverse saturation and may be set by means of a D.C. source 27 used to charge the condenser 24. The circuit may be cascade connected with the output taken from across resistance 21 or capacity 24. The output may be taken from a third winding on the core 10 connected to energize a resistance in series with a rectifier. To prevent voltage being fed back to the pulse source when the core 10 is reset a rectifier may be included in the lead 11.