| 摘要 |
LOW TEMPERATURE COEFFICIENT SHUNT FOR CURRENT MEASUREMENT A current sensor employs a main resistor of a low temperature-coefficient material for producing a voltage drop proportional to a load current therein. A second resistor, also of a low temperaturecoefficient material, and preferably having a resistance substantially exceeding that of the main resistor, is connected in parallel with the main resistor. The current divides between the main and the second resistors according to the ratio of their resistances. An output signal, reduced at least in accordance with a ratio of resistances of the first and second resistors, is obtained from the second resistor. Resistive heating of the main resistor is reduced by using a short path length in the direction of current flow and as large an area transverse to the direction of current as possible. A current transformer may employ the second resistor as a primary to step down further the current in the output signal. |
