Regulator for impedance balance of a transmission wire pair
View Patent ↗The present invention relates to a regulator for impedance balancing of first ( 104 ) and second wires ( 106 ) of a transmission wire pair having respective first and second impedances, the regular comprising: means ( 108 ) for determining a first signal ( 116 ) being representative of an average of square value of a first current (i 1 ) flowing through the first wire, means ( 118 ) for determining a second signal ( 126 ) being representative of the average of square value of a second current (i 2 ) flowing through the second wire, means ( 128, 130 ) for determining first and second coefficients (k 1 , k 2 ) on the basis of the first and second signals, first feedback means ( 132, 134, 136 ) for regulating the first current on the basis of the first coefficient, second feedback means ( 138, 140, 142 ) for regulating the second current on the basis of the second coefficient.
1. A regulator for impedance balancing of first ( 104 ) and second wires ( 106 ) of a transmission wire pair having respective first and second impedances, the regulator comprising:
means ( 108 ) for determining a first signal ( 116 ) being representative of an average of the square value of a first current (i 1 ) flowing through the first wire,
means ( 118 ) for determining a second signal ( 126 ) being representative of the average of the square value of a second current (i 2 ) flowing through the second wire,
means ( 128 , 130 ) for determining first and second coefficients (k 1 , k 2 ) on the basis of the first and second signals,
first feedback means ( 132 , 134 , 136 ) for regulating the first current on the basis of the first coefficient,
second feedback means ( 138 , 140 , 142 ) for regulating the second current on the basis of the second coefficient.
2. The regulator of claim 1 , the first feedback means having a first adder ( 132 ) for providing a first control signal on the basis of a voltage level of the first wire (V′e 1 ) and a voltage level of the second wire (Ve 2 ), a first multiplier ( 134 ) for multiplication of the first control signal with the first coefficient (k 1 ), and a first subtracter ( 136 ) for subtracting the multiplied first control signal, and the second feedback means having a second adder ( 138 ) for providing a second control signal on the basis of a voltage level of the first wire (Ve 1 ) and voltage level of the second wire (V′e 2 ), and a second multiplier ( 140 ) for multiplication of the second control signal with the second coefficient (k 2 ), and a second subtracter ( 142 ) for subtracting the multiplied second control signal.
3. A central office for a telephone network, the central office having first and second input impedances (PTC 1 , PTC 2 ) for coupling of first and second wires of a transmission wire pair, the first and second wires having respective first and second impedances, the central office comprising a regulator for balancing of the combined first impedance and first input impedance and the combined second impedance and second input impedance, the regulator having:
means ( 108 ) for determining a first signal ( 116 ) being representative of an average of the square value of a first current (i 1 ) flowing through the first wire,
means ( 118 ) for determining a second signal ( 126 ) being representative of the average of the square value of a second current (i 2 ) flowing through the second wire,
means ( 128 , 130 ) for determining first and second coefficients (k 1 , k 2 ) on the basis of the first and second signals,
first feedback means ( 132 , 134 , 136 ) for regulating the first current on the basis of the first coefficient,
second feedback means ( 138 , 140 , 142 ) for regulating the second current on the basis of the second coefficient.
4. The central office of claim 3 , the first feedback means having a first adder ( 132 ) for providing a first control signal on the basis of a voltage level of the first wire (V′e 1 ) and a voltage level of the second wire (Ve 2 ), a first multiplier ( 134 ) for multiplication of the first control signal with the first coefficient (k 1 ), and a first subtracter ( 136 ) for subtracting the multiplied first control signal, and the second feedback means having a second adder ( 138 ) for providing a second control signal on the basis of a voltage level of the first wire (Ve 1 ) and voltage level of the second wire (V′e 2 ), and a second multiplier ( 140 ) for multiplication of the second control signal with the second coefficient (k 2 ), and a second subtracter ( 142 ) for subtracting the multiplied second control signal.
5. A method of regulating first and second currents flowing through respective first and second wires of a telephone wire pair, the method comprising:
determining of a first signal being representative of the average of the square value of the first current and the second signal being representative of the average of the square value of the second current,
determining of first and second coefficients on the basis of the first and second signals,
regulating the first current on the basis of the first coefficient and regulating the second current on the basis of the second coefficient.
6. The method of claim 5 wherein the regulation is performed by:
determining first and second control signals on the basis of a voltage level of the first wire and voltage level of the second wire,
multiplying of the first control signal with the first coefficient and multiplying of the second control signal with the second coefficient,
subtracting of the multiplied first control signal from the first current and subtracting of the multiplied second control signal from the second current.
7. The method of claim 5 , wherein the first coefficient (k 1 ) is obtained by subtracting the second signal from the first signal and wherein the second coefficient (k 2 ) is obtained by subtracting the first signal from the second signal.