DC switch
AssigneeSiemens Aktiengesellschaft
InventorsKarsten Handt, Stefan Hänsel
Life of this patent
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Abstract
Various embodiments include a DC switch for disconnecting a DC line. The switch may include: a power semiconductor switch arranged in a current path of the DC line; a first sensor for measuring the input and output voltages; a second sensor for measuring the current flowing through the DC line; and a controller for the power semiconductor switch. The control device is configured to: switch on the DC switch for a first time period; determine the input voltage present; determine the output voltage present at the end of the first time period; determine the current intensity present at the end of the first time period; and determine an inductance and/or capacitance from the determined values.
Claims14
A DC switch for disconnecting a DC line, the switch comprising:
- a power semiconductor switch arranged in a current path of the DC line;
- a first sensor for measuring the input and output voltages;
- a second sensor for measuring the current flowing through the DC line;
- a controller for the power semiconductor switch, the controller configured to:
- switch on the DC switch for a first time period;
- determine the input voltage present;
- determine the output voltage present at the end of the first time period;
- determine the current intensity present at the end of the first time period;
- determine an inductance and/or capacitance from the determined values;
- and
- compare the determined current intensity with a threshold value and, on the basis of the result of the comparison, determine once again the inductance present using a second time period instead of the first time period, wherein the second time period is longer than the first time period.
A DC switch for disconnecting a DC line, the switch comprising:
- a power semiconductor switch arranged in a current path of the DC line;
- a first sensor for measuring the input and output voltages;
- a second sensor for measuring the current flowing through the DC line;
- a controller for the power semiconductor switch, the control device configured to:
- switch on the DC switch for a first time period;
- determine the input voltage present;
- determine the output voltage present at the end of the first time period;
- determine the current intensity present at the end of the first time period;
- and
- determine an inductance and/or capacitance from the determined values,
- wherein the controller repeatedly carries out the determination of the inductance present and ascertains an averaged inductance.
A DC switch for disconnecting a DC line, the switch comprising:
- a power semiconductor switch arranged in a current path of the DC line;
- a first sensor for measuring the input and output voltages;
- a second sensor for measuring the current flowing through the DC line;
- a controller for the power semiconductor switch, the control device configured to:
- switch on the DC switch for a first time period;
- determine the input voltage present;
- determine the output voltage present at the end of the first time period;
- determine the current intensity present at the end of the first time period;
- and
- determine an inductance and/or capacitance from the determined values;
- ascertain a duration for the current intensity to fall to zero after the switching into the disconnected state and to take into account when ascertaining the capacitance present on the load side.
Dependencies are inferred from the claim text.