H - Electricity – 04 – M
Patent
H - Electricity
04
M
379/63
H04M 19/00 (2006.01)
Patent
CA 1291836
BATTERY FEED CIRCUIT ABSTRACT OF THE DISCLOSURE A battery feed circuit including a main battery feed part and its peripheral circuits provided in a line circuit of a switching system. The peripheral circuits include the following: First, a means for forming a low impedance with respect to in- phase signals, simply realized by a capacitor; second, a bias circuit able to suppress the entry of power source noise and easily switch magnitudes of bias voltages and polarities, realized by a bias voltage generating means, a buffer means, and an AC bypass capacitor; third, a battery feed current control circuit able to suppress overflow of battery feed current when the distance to the subscriber is short, which detects an overcurrent component above a predetermined value, and, in accordance with the same, changes the bias voltage; fourth, a battery feed current supervising circuit able to detect current in both the forward and reverse directions, realized by an emitter-follower pair and a voltage/current converting resistor; fifth, a circuit for detecting bidirectional battery feed currents at a high precision, which is formed by forward direction and reverse direction current detection means provided with VBE cancelling means; and sixth, an overcurrent protection circuit, which changes the voltage applied between the inputs (+, -) of a transconductance amplifier forming the main battery feed part in accordance with an excess voltage.
569416
Kinoshita Kazumi
Takato Kenji
Tojo Toshiro
Yamamoto Yuzo
Fujitsu Limited
Mcfadden Fincham
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