Monitoring device and method for monitoring a line section using a monitoring device
First Claim
1. A monitoring device comprising:
- a first line section with a first connection point and a second connection point spaced apart from the first connection point in a direction of the line;
a control unit;
a first current sensing unit comprising;
a first current source connectable to the first connection point via a first connecting line and connectable to the second connection point via a second connecting line, the first current source being configured to output a first current;
a first switch having a control input, the first switch being inserted into the second connecting line and being configured to connect or disconnect the first current source to the second connection point; and
a first differential amplifier having a first input, a second input, and an output, the first input being connectable to the first connection point via a third connecting line, the second input being connectable to the second connection point by a fourth connecting line;
wherein the control unit is inserted between the output of the first differential amplifier and the control input of the first switch,wherein an actual current is passed through the first line section,wherein, in a first state, the first switch is closed and the first current is impressed on the first line section in addition to the first actual current, and a first voltage, determined by the amplitude of the actual current and the amplitude of the first current, is present between the first input and the second input of the first differential amplifier,wherein, in a second state, the first switch is open and a second voltage, determined exclusively by the actual current, is present between the first input and the second input of the first differential amplifier,wherein the control unit is configured to ascertain the amplitude of the actual current from the first voltage of the first state and the second voltage of the second state, andwherein the first switch is either in the first state or in the second state.
1 Assignment
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Accused Products
Abstract
A monitoring device is provided that includes a first line section with a first connection point and a second connection point spaced apart from the first connection point in the direction of the line, and with a control unit and with a first current sensing unit, having a current source. A first switch is inserted into the first connecting line and connects the first current source to the first connection point or disconnects it therefrom. In a first state the first switch is closed and the first current is impressed on the first line section and a first voltage determined by the amplitude of the actual current, and in a second state the first switch is open and a second voltage is determined, and the control unit is configured to ascertain the amplitude of the first actual current from the two voltages.
15 Citations
22 Claims
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1. A monitoring device comprising:
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a first line section with a first connection point and a second connection point spaced apart from the first connection point in a direction of the line; a control unit; a first current sensing unit comprising; a first current source connectable to the first connection point via a first connecting line and connectable to the second connection point via a second connecting line, the first current source being configured to output a first current; a first switch having a control input, the first switch being inserted into the second connecting line and being configured to connect or disconnect the first current source to the second connection point; and a first differential amplifier having a first input, a second input, and an output, the first input being connectable to the first connection point via a third connecting line, the second input being connectable to the second connection point by a fourth connecting line; wherein the control unit is inserted between the output of the first differential amplifier and the control input of the first switch, wherein an actual current is passed through the first line section, wherein, in a first state, the first switch is closed and the first current is impressed on the first line section in addition to the first actual current, and a first voltage, determined by the amplitude of the actual current and the amplitude of the first current, is present between the first input and the second input of the first differential amplifier, wherein, in a second state, the first switch is open and a second voltage, determined exclusively by the actual current, is present between the first input and the second input of the first differential amplifier, wherein the control unit is configured to ascertain the amplitude of the actual current from the first voltage of the first state and the second voltage of the second state, and wherein the first switch is either in the first state or in the second state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 17, 18, 19, 20)
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12. A monitoring device comprising:
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a first line section with a first connection point and a second connection point spaced apart from the first connection point in a direction of the line; a control unit; a first current sensing unit comprising; a first current source connectable to the first connection point via a first connecting line and connectable to the second connection point via a second connecting line, the first current source being configured to output a first current; a first switch having a control input, the first switch being inserted into the second connecting line and being configured to connect or disconnect the first current source to the second connection point; and a first differential amplifier having a first input, a second input, and an output, the first input being connectable to the first connection point via a third connecting line, the second input being connectable to the second connection point by a fourth connecting line; wherein the control unit is inserted between the output of the first differential amplifier and the control input of the first switch, wherein an actual current is passed through the first line section, wherein, in a first state, the first switch is closed and the first current is impressed on the first line section in addition to the first actual current, and a first voltage, determined by the amplitude of the actual current and the amplitude of the first current, is present between the first input and the second input of the first differential amplifier, wherein, in a second state, the first switch is open and a second voltage, determined exclusively by the actual current, is present between the first input and the second input of the first differential amplifier, wherein the control unit is configured to ascertain the amplitude of the actual current from the first voltage and the second voltage, and wherein the control unit is configured to ascertain the amplitude of the actual current via a value of the voltage in the first state and via a value of the voltage in the second state and via the amplitude of the first current.
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14. A method for monitoring a first line section using a monitoring device, the method comprising:
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providing the first line section with a first connection point and a second connection point spaced apart from the first connection point in a direction of the line; providing a control unit; and providing a first current sensing unit, the first current sensing unit comprising; a first current source connectable via a first connecting line to the first connection point and connectable via a second connecting line to the second connection point, the first current source being configured to output a first current;
a first switch having a control input, the first switch being configured to be inserted into the first connecting line and being configured to connect or disconnect the first current source to the first connection point;
a first differential amplifier with a first input, a second input, and an output, the first input being connectable to the first connection point via a third connecting line and the second input being connectable to the second connection point by a fourth connecting line;inserting the control unit between an output of a first differential amplifier and a control input of the first switch; passing an actual current through the first line section; closing, in a first state, the first switch such that the first current is impressed on the first line section in addition to the actual current and a first voltage determined by the amplitude of the actual current and the amplitude of the first current is present between the first input and the second input of the first differential amplifier; opening, in a second state, the first switch such that a second voltage determined exclusively by the first actual current is present between the first input and the second input of the first differential amplifier; and ascertaining, via the control unit, an amplitude of the first actual current from the first voltage in the first state and the second voltage in the second state, wherein the first switch is either in the first state or in the second state. - View Dependent Claims (15)
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16. A method for monitoring a first line section using a monitoring device, the method comprising:
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providing the first line section with a first connection point and a second connection point spaced apart from the first connection point in a direction of the line; providing a control unit; and providing a first current sensing unit, the first current sensing unit comprising; a first current source connectable via a first connecting line to the first connection point and connectable via a second connecting line to the second connection point, the first current source being configured to output a first current;
a first switch having a control input, the first switch being configured to be inserted into the first connecting line and being configured to connect or disconnect the first current source to the first connection point;
a first differential amplifier with a first input, a second input, and an output, the first input being connectable to the first connection point via a third connecting line and the second input being connectable to the second connection point by a fourth connecting line;inserting the control unit between an output of a first differential amplifier and a control input of the first switch; passing an actual current through the first line section; closing, in a first state, the first switch such that the first current is impressed on the first line section in addition to the actual current and a first voltage determined by the amplitude of the actual current and the amplitude of the first current is present between the first input and the second input of the first differential amplifier; opening, in a second state, the first switch such that a second voltage determined exclusively by the first actual current is present between the first input and the second input of the first differential amplifier; and ascertaining, via the control unit, an amplitude of the first actual current from the first voltage and the second voltage, wherein the amplitude of the actual current is ascertained by the control unit via a value of the voltage in the first state and via a value of the voltage in the second state and the amplitude of the first current.
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21. A monitoring device comprising:
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a first line section with a first connection point and a second connection point spaced apart from the first connection point in a direction of the line; a second line section with a third connection point spaced apart from the second connection part in the direction of the line, the second line section being connected to the first line section at the second connection point; a control unit; a first current sensing unit comprising; a first current source connectable to the first connection point via a first connecting line and connectable to the second connection point via a second connecting line, the first current source being configured to output a first current; a first switch having a control input, the first switch being inserted into the second connecting line and being configured to connect or disconnect the first current source to the second connection point; and a first differential amplifier having a first input, a second input, and an output, the first input being receiving a signal based on a voltage difference between the first connection point and the second connection point , the second input receiving a signal based on a voltage difference between the second connection point and the third connection point; wherein the control unit is inserted between the output of the first differential amplifier and the control input of the first switch, wherein an actual current is passed through the first line section, wherein, in a first state, the first switch is closed and the first current is impressed on the first line section in addition to the first actual current and a first voltage determined by the amplitude of the actual current and the amplitude of the first current is present between the first input and second input of the first differential amplifier, wherein, in a second state, the first switch is open and a second voltage determined exclusively by the actual current is present between the first input and second input of the first differential amplifier, and wherein the control unit is configured to ascertain the amplitude of the actual current from the first and second voltage.
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22. A method for monitoring a first line section using a monitoring device, the method comprising:
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providing the first line section with a first connection point and a second connection point spaced apart from the first connection point in a direction of the line; providing a second line section with a third connection point spaced apart from the second connection part in the direction of the line, the second line section being connected to the first line section at the second connection point; providing a control unit; and providing a first current sensing unit, the first current sensing unit comprising;
a first current source connectable via a first connecting line to the first connection point and connectable via a second connecting line to the second connection point, the first current source being configured to output a first current;
a first switch having a control input, the first switch being configured to be inserted into the first connecting line and being configured to connect or disconnect the first current source to the first connection point;
a first differential amplifier with a first input, a second input, and an output, the first input being receiving a signal based on a voltage difference between the first connection point and the second connection point and the second input being receiving a signal based on a voltage difference between the second connection point and the third connection point;inserting the control unit between the output of the first differential amplifier and the control input of the first switch; passing an actual current through the first line section; closing, in a first state, the first switch such that the first current is impressed on the first line section in addition to the actual current and a first voltage determined by the amplitude of the actual current and the amplitude of the first current is present between the first input and second input of the first differential amplifier; opening, in a second state, the first switch such that a second voltage determined exclusively by the first actual current is present between the first input and second input of the first differential amplifier; and ascertaining an amplitude of the first actual current from the first and second voltage via the control unit.
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Specification