Power regulator for use with line signal repeaters which are remotely powered
First Claim
1. In a transmission system in which operating power is fed over the transmission cable pair to line signal repeaters, a power regulator used in conjunction with a line signal repeater, which comprises:
- an input circuit including first and second terminals connected to receive line current including a DC power feed current component and an induced longitudinal current component;
an output circuit including third and fourth terminals, said output circuit when coupled to said repeater supplying load current thereto, said fourth terminal being common with said second terminal;
impedance means, having an input terminal connected to said first terminal and an output terminal connected to said third terminal, for receiving said line current from said first terminal and for delivering said load current to said third terminal;
a fifth terminal;
energy storage means connected across said fourth and fifth terminals;
rectifying means connected across said first and fifth terminals, said rectifying means being conductive when the line current exceeds the load requirements of the line signal repeater and being non-conductive otherwise, said rectifying means thereby providing excess line current to charge said energy storage device;
shunt voltage regulating means connected between said fourth terminal and said third terminal, said shunt voltage regulating means being responsive to said line current for producing a constant voltage across said third and fourth terminals so long as said line current exceeds a predetermined minimum, and causing said constant voltage to decrease when said line current falls below said minimum, said shunt voltage regulating means also providing a reference voltage at a reference voltage terminal;
biasing means connected between said third and fourth terminals for providing first and second voltages at first and second bias voltage terminals, respectively, said bias voltages varying in response to variations in amplitude of the line current;
control means responsive to said reference voltage and said first bias voltage, for controlling the period of and rate of energy discharge from said energy storage means to said output circuit, whereby the energy in said energy storage means supplements a power feed current when the line current falls below said predetermined minimum; and
shunt current regulating means responsive to said reference voltage and to said second bias voltage, for controlling the amplitude of the current passed through said output terminals.
8 Assignments
0 Petitions
Accused Products
Abstract
Operating power for line signal repeaters is fed over a transmission cable pair (signal line) which is susceptible to lightning strikes and, thus, to longitudinally induced currents in the DC power feed circuit. A symmetrical non-linear power regulator is connected between the signal line and the line signal repeater, and includes a high current shunt regulator which bypasses excessive induced currents. By so doing the adverse effects of these induced currents on the operation of the line signal repeater is minimized. A shunt voltage regulator provides the line repeater with a constant operating voltage when the line current (DC line power feed current plus induced currents) is greater than the minimum required bias current. When the potential at input terminals of the power regulator exceeds a predetermined value, a portion of the excess current is conducted through a blocking diode to charge an energy storage device. But, when the DC line power feed current and the induced current oppose each other the energy stored in the energy storage device is used to supplement the power feed current to just maintain the required repeater voltage, until the potential decreases below the operating voltage.
37 Citations
5 Claims
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1. In a transmission system in which operating power is fed over the transmission cable pair to line signal repeaters, a power regulator used in conjunction with a line signal repeater, which comprises:
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an input circuit including first and second terminals connected to receive line current including a DC power feed current component and an induced longitudinal current component; an output circuit including third and fourth terminals, said output circuit when coupled to said repeater supplying load current thereto, said fourth terminal being common with said second terminal; impedance means, having an input terminal connected to said first terminal and an output terminal connected to said third terminal, for receiving said line current from said first terminal and for delivering said load current to said third terminal; a fifth terminal; energy storage means connected across said fourth and fifth terminals; rectifying means connected across said first and fifth terminals, said rectifying means being conductive when the line current exceeds the load requirements of the line signal repeater and being non-conductive otherwise, said rectifying means thereby providing excess line current to charge said energy storage device; shunt voltage regulating means connected between said fourth terminal and said third terminal, said shunt voltage regulating means being responsive to said line current for producing a constant voltage across said third and fourth terminals so long as said line current exceeds a predetermined minimum, and causing said constant voltage to decrease when said line current falls below said minimum, said shunt voltage regulating means also providing a reference voltage at a reference voltage terminal; biasing means connected between said third and fourth terminals for providing first and second voltages at first and second bias voltage terminals, respectively, said bias voltages varying in response to variations in amplitude of the line current; control means responsive to said reference voltage and said first bias voltage, for controlling the period of and rate of energy discharge from said energy storage means to said output circuit, whereby the energy in said energy storage means supplements a power feed current when the line current falls below said predetermined minimum; and shunt current regulating means responsive to said reference voltage and to said second bias voltage, for controlling the amplitude of the current passed through said output terminals. - View Dependent Claims (2, 3, 4, 5)
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Specification