Device and procedure for current measurement with temperature-based frequency response correction in an analog signal path
AssigneeInfineon Technologies AG
InventorsEdwin Mario Motz, Francesco Polo
Life of this patent
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Abstract
The present disclosure relates to a current sensor, including a magnetic-field sensor for measuring a magnetic field induced by an electrical current; an output connection for providing an amplified measurement signal from the magnetic-field sensor, the magnetic-field sensor and the output connection being connected by an analog signal path having at least one amplifier, the analog signal path having a frequency response; a temperature sensor for measuring a temperature; and a compensation circuit which is coupled to the analog signal path and is configured to correct the frequency response of the analog signal path based on the temperature.
Claims18
A current sensor, comprising:
- a magnetic-field sensor configured to measure a magnetic field induced by an electrical current;
- an output connection configured to provide an amplified measurement signal from the magnetic-field sensor,
- the magnetic-field sensor and the output connection being connected by an analog signal path having at least one amplifier, the analog signal path having a frequency response;
- a temperature sensor configured to measure a temperature;
- and
- a compensation circuit which is coupled to the analog signal path and is configured to compensate for temperature-dependent eddy current effects in the frequency response of the analog signal path based on the temperature.
A current sensor, comprising:
- a magnetic-field sensor configured to measure a magnetic field induced by an electrical current;
- an output connection configured to provide an amplified measurement signal from the magnetic-field sensor,
- the magnetic-field sensor and the output connection being connected by an analog signal path having at least one amplifier, the analog signal path having a frequency response;
- a temperature sensor configured to measure a temperature;
- and
- a compensation circuit which is coupled to the analog signal path and is configured to correct the frequency response of the analog signal path based on the temperature
- wherein the analog signal path comprises a first amplifier and a second amplifier, the compensation circuit being connected between the first amplifier and the second amplifier,
- wherein the first amplifier comprises:
- a non-inverting output and an inverting output;
- wherein the second amplifier comprises:
- a non-inverting input and an inverting input;
- and
- wherein the compensation circuit comprises:
- a first resistor-capacitor (RC) element which is coupled between the non-inverting output of the first amplifier and the inverting input of the second amplifier, wherein the first RC element includes at least one of:
- a resistor configured to be adjusted based on the temperature, or
- a capacitor configured to be adjusted based on the temperature, and
- a second RC element which is coupled between the inverting output of the first amplifier and the non-inverting input of the second amplifier, wherein the second RC element includes at least one of:
- a resistor configured to be adjusted based on the temperature, or
- a capacitor configured to be adjusted based on the temperature.
A method for current measurement, comprising:
- using a magnetic-field sensor to measure a magnetic field induced by an electrical current;
- providing an amplified measurement signal from the magnetic-field sensor at an output connection,
- the magnetic-field sensor and the output connection being connected by an analog signal path having at least one amplifier,
- the analog signal path having a frequency response;
- measuring a temperature as a measured temperature;
- and
- correcting the frequency response of the analog signal path based on the measured temperature to compensate for temperature-dependent eddy current effects in the frequency response of the analog signal path.
Dependencies are inferred from the claim text.