| 摘要 |
PURPOSE:To extract efficiently DC power and to eliminate signal distortion by connecting a constant voltage circuit to which capacitor is connected in parallel and an AC signal transmitting transformer in series between communication lines where an AC signal voltage and a DC voltage are superimposed. CONSTITUTION:The parallel control type constant voltage circuit 14 in which the primary winding 13 of the transformer 12 to transmit an AC signal and the capacitor 15 are connected in parallel is connected in series between two line terminals 10 and 11 through which an AC signal such as sound signal is superimposed on a DC voltage to supply DC power. The DC power is extracted from the said constant voltage circuit 14 and an AC transmission signal is extracted from the secondary winding 16 of the transformer 12. Since the DC resistance of the primary winding 13 of the transformer 12 and the AC resistance of the capacitor 15 are negligibly small, a loss in terms of DC or equivalent is hardly generated and the DC power is extracted efficiently, a loss in terms of AC or equivalent is hardly produced and the AC signal such as sound is transmitted without any distortion. |
