| 摘要 |
990,227. Automatic voltage control. SIMMS MOTOR UNITS Ltd., R. N. SHIMWELL, and E. L. ROBINSON. Aug. 8,1961 [Aug. 9, 1960], No. 27587/60. Heading G3R. [Also in Division H2] An electrical supply system comprises an alternator 11, an output rectifier 14,a switchable low resistance conducting path across the alternator output to regulate the system, and a triggered semi-conductor rectifier CR1 for switching the low resistance path, rectifier CR1 having a triggering control terminal connected to the output of the rectifier 14, which control terminal switches in the low resistance conducting path when the output of the output rectifier 14 exceeds a predetermined value. When the voltage from tapping 19 on potentiometer R1,R2,R3 exceeds a certain value, it fires rectifier CR1 to provide a low resistance path across alternator terminals 15,16 via rectifiers D5,D6 and CR1 so that the D.C. output current falls to zero for the rest of that half-cycle. In alternatives, the short-circuit current may be shared by two silicon controlled rectifiers in parallel, or by two power transistors in parallel, fixed by rectifier CR1 possibly through a transfer transistor. Zener diodes may replace the potentiometer. The function of rectifiers D5, D6 may be taken over by rectifiers D4,D1 of bridge 14. A tapped transformer may be interposed between the alternator and the main output rectifier or the alternator stator winding may be tapped. |
