Hall sensor apparatus with temperature measurement function and current sensor apparatus with the same function
A Hall sensor apparatus with a temperature measurement function and a current sensor apparatus with the same function are provided, and the temperature measurement function for measuring a temperature of a Hall sensor is implementable on the Hall sensor instead of an application specific integrated circuit (ASIC) that is a controller for driving the Hall sensor or a current sensor and the ASIC is installable far away from the Hall sensor, and thus a rise in temperature of the ASIC is preventable such that a stable measurement of the Hall sensor or the current sensor and stable driving control thereof is allowable.
1. A Hall sensor apparatus with a temperature measurement function, comprising: a Hall device configured to output a Hall voltage due to Hall effect; a static current source configured to apply a static current to an input terminal of the Hall device; an input voltage measurer configured to measure an input voltage according to the static current applied to the input terminal of the Hall device by the static current source; an output voltage measurer configured to measure the Hall voltage that is an output voltage output from an output terminal of the Hall device; and a controller including a temperature calculator configured to calculate a temperature using the input voltage measured by the input voltage measurer, and a corrector configured to calculate a measured current from the output voltage measured by the output voltage measurer and correct the measured current according to the temperature calculated by the temperature calculator, wherein the temperature calculator calculates resistance from the static current applied to the input terminal of the Hall device and the input voltage measured by the input voltage measurer, and retrieves a temperature value against the calculated resistance from a lookup table.
2. The Hall sensor apparatus of claim 1 , wherein the corrector retrieves a current correction value against the temperature calculated by the temperature calculator from a lookup table, and reflects the current correction value against the temperature on the measured current to correct the measured current.
3. The Hall sensor apparatus of claim 1 , wherein the controller further includes:
a pair of analog-to-digital (A/D) converters configured to convert an analog input voltage measured by the input voltage measurer and an analog output voltage measured by the output voltage measurer into digital values; and
a pair of variable amplifiers configured to vary gains according to rated input ranges of the pair of A/D converters.
4. The Hall sensor apparatus of claim 1 , further comprising an analog output unit configured to directly output an analog output voltage measured by the output voltage measurer to the outside for emergency use.
5. The Hall sensor apparatus of claim 1 , wherein the static current source includes an n-gain current mirror circuit which allows a magnitude of an output static current to be adjusted by a predetermined gain.
6. The Hall sensor apparatus of claim 5 , wherein the controller further includes a driving current controller configured to adjust and control the magnitude of the output static current of the static current source.
7. A current sensor apparatus with a temperature measurement function, comprising: a yoke of which both end surfaces facing each other form a gap; a Hall device installed in the gap formed by the yoke and configured to output a Hall voltage due to Hall effect; a static current source configured to apply a static current to an input terminal of the Hall device; an input voltage measurer configured to measure an input voltage according to the static current applied to the input terminal of the Hall device by the static current source; an output voltage measurer configured to measure the Hall voltage that is an output voltage output from an output terminal of the Hall device; and a controller including a temperature calculator configured to calculate a temperature using the input voltage measured by the input voltage measurer, and a corrector configured to calculate a measured current from the output voltage measured by the output voltage measurer and correct the measured current according to the temperature calculated by the temperature calculator, wherein the temperature calculator calculates resistance from the static current applied to the input terminal of the Hall device and the input voltage measured by the input voltage measurer, and retrieves a temperature value against the calculated resistance from a lookup table.
8. The current sensor apparatus of claim 7 , wherein the corrector retrieves a current correction value against the temperature calculated by the temperature calculator from a lookup table, and reflects the current correction value against the temperature on the measured current to correct the measured current.
9. The current sensor apparatus of claim 7 , wherein the controller further includes:
a pair of analog-to-digital (A/D) converters configured to convert an analog input voltage measured by the input voltage measurer and an analog output voltage measured by the output voltage measurer into digital values; and
a pair of variable amplifiers configured to vary gains according to rated input ranges of the pair of A/D converters.
10. The current sensor apparatus of claim 7 , further comprising an analog output unit configured to directly output an analog output voltage measured by the output voltage measurer to the outside for emergency use.
11. The current sensor apparatus of claim 7 , wherein the static current source includes an n-gain current mirror circuit which allows a magnitude of an output static current to be adjusted by a predetermined gain.
12. The current sensor apparatus of claim 11 , wherein the controller further includes a driving current controller configured to adjust and control the magnitude of the output static current of the static current source.