H - Electricity – 04 – M
Patent
H - Electricity
04
M
321/27
H04M 19/00 (2006.01)
Patent
CA 1175898
ABSTRACT OF THE DISCLOSURE A current supply circuit comprises a DC power feed circuit exhibiting a constant current characteristic for a power source and a constant resistance charac- teristic for a load, a first detecting circuit for detecting a load current or a load voltage, a DC-DC converter circuit inserted between the power source and the DC power feed circuit, a second detecting circuit for detecting an output voltage from the DC-DC converter circuit; and an operation circuit coupled at the input with the output of the first detecting circuit and the output of the second detecting circuit for controlling the DC-DC converter circuit by the output thereof. The DC-DC converter circuit is so controlled as to produce a voltage representative of the sum of a voltage drop across the load and a fixed voltage necessary for the operation of the DC power feed circuit.
395064
Hamazato Kazuo
Hayashi Toshio
Kitano Junjiro
Sagawa Akio
Tokunaga Michio
Gowling Lafleur Henderson Llp
Hitachi Ltd.
Nippon Telegraph & Telephone Public Corporation
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