| 摘要 |
950,459. Semi-conductor pulse generating circuits. SHORT BROS & HARLAND Ltd Aug. 30, 1960 [Oct. 15, 1959], No. 34979/59. Heading H3T. A pulse generating circuit for a multichannel control system comprises a pulse generator in respect of each channel and a synchronizing arrangement. Each pulse generator includes an input circuit 13, 14 connected to an A.C. supply, a capacitor 15 charged by current from the input circuit, and a four layer PNPN semi-conductor diode 16 connected to control the discharge of the capacitor 15 through output load RL1 and RL17, the arrangement being such that when the capacitor reaches a predetermined charge the diode 16 conducts and the capacitor discharges through the output load. Each generator includes a primary winding P in series in its discharge circuit, and a plurality of secondary windings S1, S2 equal in number to the number of channels less one are coupled to each primary winding P and also to the discharge circuits of the generators for the other channels such that current flowing in the discharge circuit of any of the generators induces in each of the other discharge circuits a voltage which assists that developed by the capacitor 15 tending to produce conduction in this circuit. Thus, when one of the capacitors discharges all the others in the rest of the channels also discharge simultaneously. The relay in each generator may be substituted by an additional secondary winding. |
