Verfahren und Anordnung zum selbsttaetigen Abgleich willkuerlich veraenderbarer Eingangswerte

摘要

1,165,584. High voltage D.C. systems. LICENTIA PATENT - VERWALTUNGS G.m.b.H. 17 Feb., 1967 [18 Feb., 1966], No. 7619/67. Heading H2F. [Also in Division G3] In an arrangement such as a high voltage D.C. transmission system including a plurality of input current sources, e.g. E 1 , E 2 , E 3 , each producing a respective output current, e.g. A 1 , A 2 , A 3 in which it is desired to maintain the sum of the output currents at a predetermined fixed value despite arbitrary variations in any one of the individual output currents, there is provided a control circuit which automatically balances the currents in the arrangement to achieve the desired object. As shown, the control circuit comprises summing networks 1, 2, 3, which receive one input from the sources E 1 , E 2 ; the outputs of the summing networks constitute the output currents A 1 , A 2 , A 3 and these outputs are also applied to an adder 4 (Fig. 6, not shown), which compares the sum of the outputs with a desired value set by a device 6; the resulting output from adder 4 is applied, over an amplifier 5 (Fig. 8, not shown), and respective adjusting impedances 7, 8, 9, as another input to the summing networks 1, 2, 3. The arrangement is such that the values added in the summing networks 1, 2, 3 to the input values E 1 , E 2 , E 3 are automatically varied in dependence upon variations in the output from the adder 4 in such a manner that the sum of the output values A 1 , A 2 , A 3 is maintained at the desired value determined by the setting of device 6. The arrangement may include a switch operable to connect the output of the device 6 additionally to any one of the summing networks 1, 2 or 3 (Fig. 2, not shown) and may also include limiting circuits associated with the outputs of the networks 1, 2, 3 (Figs. 3, 4 and 7, not shown). A superimposed closed loop control circuit may be arranged to keep one of the outputs, e.g. A 1 , at a pre-set value despite variations, in the other output values (Fig. 5, not shown).