Current detecting circuit, current detecting device, and switching device
As paths for a current flowing through a conductor, a first current path through which a current flows from a first conductive portion to a second conductive portion, and a second current path through which a current flows from a third conductive portion to the second conductive portion are provided. Each of the first conductive portion, the second conductive portion, and the third conductive portion has a plate shape, a point P 1 is located on a plate surface of the first conductive portion, and a point P 2 is located on a plate surface of the second conductive portion. A current detecting circuit detects a value related to a potential difference between the points P 1 and P 2 , and outputs a voltage value corresponding to a values of a current flowing through each of the first current path and the second current path.
1. A current detecting device comprising:
a conductive plate having a first conductive portion, a second conductive portion and a third conductive portion wherein the first conductive portion is electrically connected to the third conductive portion in parallel and wherein the first conductive portion and the third conductive portion are electrically connected to the second conductive portion in series;
a potential difference detecting portion that detects a value related to a potential difference between two points located on plate surfaces of the first conductive portion and the second conductive portion, wherein the value is one of the current flowing between the two points and a voltage difference between the two points; and
a temperature detecting portion that detects a temperature value of a conductor formed by connecting the first conductive portion and the third conductive portion with the second conductive portion; and
a calculating portion that calculates the value of the current flowing through the first current path or the second current path, based on the temperature value detected by the temperature detecting portion and the voltage value output by the current detecting circuit.
2. The current detecting device according to claim 1 , comprising:
a conductive wire connected between the two points, wherein the potential difference detecting portion detects the value of a current flowing through the conductive wire.
3. The current detecting device according to claim 1 , wherein each of the first conductive portion and the third conductive portion is connected to the second conductive portion via a resistive portion having a lower conductivity than the first conductive portion, the second conductive portion, and the third conductive portion.
4. The switching device according to 1 , wherein
the switching device performs the switching by controlling activation/deactivation of a transforming portion that transforms an applied voltage and outputs the transformed voltage to the first conductive portion, and turning a switch on/off whose one end is connected to the third conductive portion.
5. The current detecting according to claim 2 , wherein each of the first conductive portion and the third conductive portion is connected to the second conductive portion via a resistive portion having a lower conductivity than the first conductive portion, the second conductive portion, and the third conductive portion.
6. A switching device comprising:
the current detecting circuit according to claim 2 ; and
a switching portion that switches a current path through which a current flows, to the first current path or the second current path, wherein
the switching portion performs the switching based on which of the first current path and the second current path a current is flowing through, and the voltage value output by the current detecting circuit.
7. A switching device comprising:
the current detecting circuit according to claim 2 ;
a switching portion that switches a current path through which a current flows, to the first current path or the second current path; and
a temperature detecting portion that detects a temperature value of a conductor formed by connecting the first conductive portion and the third conductive portion with the second conductive portion, wherein
the switching portion performs the switching based on which of the first current path and the second current path a current is flowing through, the voltage value output by the current detecting circuit, and the temperature value detected by the temperature detecting portion.
8. A current detecting device comprising:
a conductive plate having a first conductive portion, a second conductive portion and a third conductive portion wherein the first conductive portion is electrically connected to the third conductive portion in parallel and wherein the first conductive portion and the third conductive portion are electrically connected to the second conductive portion in series;
a potential difference detecting portion that detects a value related to a potential difference between two points located on plate surfaces of the first conductive portion and the second conductive portion; wherein the value is one of the current flowing between the two points and a voltage difference between the two points, wherein each of the first conductive portion and the third conductive portion is connected to the second conductive portion via a resistive portion having a lower conductivity than the first conductive portion, the second conductive portion, and the third conductive portion; and
a temperature detecting portion that detects a temperature value of the resistive portion; and
a calculating portion that calculates the value of the current flowing through the first current path or the second current path, based on the temperature value detected by the temperature detecting portion and the voltage value output by the current detecting circuit.
9. A switching device comprising:
a conductive plate having a first conductive portion, a second conductive portion and a third conductive portion wherein the first conductive portion is electrically connected to the third conductive portion in parallel and wherein the first conductive portion and the third conductive portion are electrically connected to the second conductive portion in series;
a potential difference detecting portion that detects a value related to a potential difference between two points located on plate surfaces of the first conductive portion and the second conductive portion; wherein the value is one of the current flowing between the two points and a voltage difference between the two points;
a switching portion that switches a current path through which the current flows, to the first current path or the second current path; and
a temperature detecting portion that detects a temperature value of a conductor formed by connecting the first conductive portion and the third conductive portion with the second conductive portion, wherein
the switching portion performs the switching based on which of the first current path and the second current path the current is flowing through, the voltage value output by the current detecting circuit, and the temperature value detected by the temperature detecting portion.
10. The switching device according to claim 9 , wherein the switching device performs the switching by controlling activation/deactivation of a transforming portion that transforms an applied voltage and outputs the transformed voltage to the first conductive portion, and turning a switch on/off whose one end is connected to the third conductive portion.
11. A switching device comprising:
a conductive plate having a first conductive portion, a second conductive portion and a third conductive portion wherein the first conductive portion is electrically connected to the third conductive portion in parallel and wherein the first conductive portion and the third conductive portion are electrically connected to the second conductive portion in series;
a potential difference detecting portion that detects a value related to a potential difference between two points located on plate surfaces of the first conductive portion and the second conductive portion; wherein the value is one of the current flowing between the two points and a voltage difference between the two points, wherein each of the first conductive portion and the third conductive portion is connected to the second conductive portion via a resistive portion having a lower conductivity than the first conductive portion, the second conductive portion, and the third conductive portion;
a switching portion that switches a current path, through which a current flows, to the first current path or the second current path; and
a temperature detecting portion that detects a temperature value of the resistive portion, wherein
the switching portion performs the switching based on which of the first current path and the second current path a current is flowing through, the voltage value output by the current detecting circuit, and the temperature value detected by the temperature detecting portion.
12. The switching device according to claim 11 , wherein the switching device performs the switching by controlling activation/deactivation of a transforming portion that transforms an applied voltage and outputs the transformed voltage to the first conductive portion, and turning a switch on/off whose one end is connected to the third conductive portion.