| 摘要 |
1,128,777. Non-linear circuits. SOC. GENERALE DE CONSTRUCTIONS ELECTRIQUES ET MECANIQUES (ALSTHOM). 29 Nov., 1965 [27 Nov., 1964], No. 50595/65. Heading G4G. In a circuit (Fig. 5) producing a voltage signal representing the deviation between a varying current and a threshold current, an image current i proportional to a variable current I flows between terminals 1, 2 in series with a resistor 16 and the emitter/collector circuit of transistor 17 in parallel with resistor 18, across which a voltage u appears representing the deviation, between current i and threshold current i 0 set by polarization voltage 21 applied between the emitter and base of the transistor; which is saturated to short-circuit resistor 18 for i#i 0 , and to present a shunting resistance across this resistor for i > i 0 which increases with the varying current until the transistor blocks, so that for increasing values of i, the resultant values of u are defined by straight lines OA, AB, and BC (Fig. 6); the slope of AB being defined by resistor 18. The energization current may be derived by rectification and smoothing of single - phase A.C. (Fig. 7, not shown) or of 3-phase A.C. through current transformers whose saturation causes curvature of 3C (Figs. 8, 9, not shown).
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