| 摘要 |
<p>1326523 Automatic voltage control SOC D'OPTIQUE PRECISION ELECTRONIQUE ET MECANIQUE 8 Jan 1971 [8 Jan 1970] 985/71 Heading G3R [Also in Division H2] A stabilized D.C. voltage is provided by a rectifier 14 supplied by one secondary winding 12 of a transformer 25 whose other secondary winding 13 supplies another rectifier 15 and potentiometer 19 to obtain a voltage proportional to that of the rectifier 14, which voltage is compared with a reference voltage to obtain an error signal for adjusting the amplitude of the A.C. supply to the primary winding 11 of the transformer 25. This supply comprises an oscillator 5 whose sinusoidal output voltage is modulated by a variable gain device 26 controlled by an integrating amplifier 24, which receives the error signal obtained by summing the voltage from potentiometer 19 with the voltage from a potentiometer 22 supplied from a reference voltage source 23, preferably constituted by a Zener diode placed in a constant-temperature enclosure. The device 26 comprises resistors 6, 8 and field-effect transistors 7, 9 whose resistance is controlled by the output of amplifier 24. The transistors 7, 9 may be replaced by triode valves. Device 26 may be combined with the following amplifier 10 if the latter is of the variable-gain type. In the described embodiment the output of rectifier 14 is combined, across a load resistor 18, with the output of a high voltage generator 1 supplying an electron-gun cathode 4, so that the combined high voltage supply to the biasing grid 3 of the gun is controlled by control of the low voltage supply provided by rectifier 14. The windings 12, 13, rectifiers 14, 15, filters 16, 17 and loads 18, 19 may be identical pairs or pairs related by a predetermined ratio.</p> |
