| 摘要 |
<p>1,274,498. Automatic control of speed. TEIJIN Ltd. Aug. 19, 1969 [Aug. 19, 1968; Feb. 13, 1969], No.41264/69. Heading G3R. An automatic controller, e.g. regulating the speed of a D.C. motor 12, comprises an oscillator 1 (a uni-junction transistor circuit) which triggers a flip-flop 2 for producing two reference pulse signals A, B, one of which is compared at 3 with pulses Pf corresponding to a variable (motor speed) to produce a further pulse signal C which is supplied to means which produces a pulse signal H corresponding to the difference between the signal C and the other of the reference pulse signals, the signal H then being converted to a rectangular wave signal having a predetermined width at 9 which is integrated at 10 to control the variable, e.g. by an S.C.R. circuit 11. The signal H is produced from A and C by supplying A and C to set terminals of flip-flops 6, 4, which are reset by their cross-connected outputs, after differentiation at 7, 5. One of these outputs, G, is then gated by the B reference signal in an AND gate 8 to produce H. A mathematical explanation of the system is given, together with typical performance figures.</p> |
