JPS6419928A - Dc power feeder - Google Patents

Abstract

PURPOSE:To allow DC power to be supplied to multiple equipment without pulse transformers, by supplying DC power through an amplification circuit of high impedance viewed from a control signal of the common line. CONSTITUTION:The DC power from a battery 3a is supplied to a common line 2 through choke coils 5 and 6, an emitter and a collector of a transistor 4a. In this case, the output impedance of an amplification circuit 4 is extremely high, as the output signal is taken from the collector of the transistor 4a. The amplification circuit 4 is of high impedance viewed from the control signal of the line 2, as the contact points of collector of transistor 4a and a choke coil 15 are connected to the line 2. The amplification circuit 4 constitutes a return amplification circuit for the control signal as the control signal components leaking through the transistor 4a will generate on both ends of the choke coil 6 and the load connected to the line 2 will be the load of the transistor 4a.