electrical control device and method for the control of alternating currents.

摘要

935,473. Electrolytic amplifiers. OVITRON CORPORATION. Feb. 11, 1960 [Feb. 15, 1959], No. 4941/60. Class 37. [Also in Group XXXIX] An electrolytic amplifier or relay comprises a pair of electrodes 12, 13 covered with film 16, 17 of metallic oxides and an unfilmed electrode 18, all three electrodes being positioned in an electrolyte 23 containing metallic ions. The filmed electrodes act as rectifiers in opposition and offer a high impedance to an alternating voltage across them. The impedance is reduced when the unfilmed electrode 18 is made positive with respect to the other electrodes 12, 13 giving a power gain of the order of 1000 to 1. In a preferred embodiment the electrodes 12, 13 are of tantalum filmed with tantalum oxide. The electrode 18 is of platinum. The electrolyte is a saturated solution of a zinc salt such as chloride or zinc sulphate in diluted hydrochloric, sulphuric, phosphoric or acetic acid. Control circuits.-In Fig. 2, the current supplied from a transformer 30 to a load 31 is controlled by an electrolytic device. The electrodes 12, 13 are connected to rectifiers 26, 27 in a full wave rectifier circuit, the output of which feeds the control electrode 18 through a variable resistor 29. In Fig. 3, the control electrode 18 is fed by a battery through a reversing switch 37, the control circuit being isolated from the alternating current circuit by chokes 33, 34.