Temperature compensation system for Hall effect element
First Claim
1. A device for measuring the density of a magnetic flux field, comprising a Hall element for generating an output voltage as a function of a Hall element control current and the flux density of the magnetic field to which the element is exposed, said output voltage also being a function of Hall element temperature, means for measuring the temperature of said Hall element, memory means having storage locations containing Hall voltage compensation data as a function of Hall element temperature;
- means responsive to said temperature measuring means for generating a Hall temperature dependent digital signal, means for applying said temperature dependent digital signal as an address to said memory means to generate a correction voltage corresponding to the Hall element temperature, and means for combining said correction voltage with said Hall element output voltage to provide a temperature compensated output voltage.
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Abstract
In a solid state current, power or energy meter having a Hall element magnetically coupled to line current, a system for compensating the Hall voltage for its dependence on temperature comprises a read only memory (ROM) containing experimentally obtained temperature compensation data. The temperature of the Hall element is measured by a thermistor to develop a temperature dependent voltage. In one embodiment, the Hall element voltage and temperature dependent voltage are digitalized and supplied to address the ROM to generate a temperature compensated Hall voltage. In a second embodiment, the ROM is addressed by only the temperature dependent voltage to generate a correction voltage that is added to the Hall element voltage for temperature compensation.
54 Citations
18 Claims
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1. A device for measuring the density of a magnetic flux field, comprising a Hall element for generating an output voltage as a function of a Hall element control current and the flux density of the magnetic field to which the element is exposed, said output voltage also being a function of Hall element temperature, means for measuring the temperature of said Hall element, memory means having storage locations containing Hall voltage compensation data as a function of Hall element temperature;
- means responsive to said temperature measuring means for generating a Hall temperature dependent digital signal, means for applying said temperature dependent digital signal as an address to said memory means to generate a correction voltage corresponding to the Hall element temperature, and means for combining said correction voltage with said Hall element output voltage to provide a temperature compensated output voltage.
- View Dependent Claims (3, 6, 7)
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2. A device for measuring the density of a magnetic flux field, comprising a Hall element for generating an output signal as a function of a Hall element control current and the flux density of the magnetic field to which the Hall element is exposed, said output signal also being a function of Hall element temperature;
- means for measuring the temperature of said Hall element;
means responsive to said temperature measuring means for generating a Hall element temperature dependent signal;
means for digitalizing said temperature dependent signal and said Hall element output signal;
memory means having storage locations containing compensated Hall voltage data as a function of Hall element output signal and Hall element temperature; and
means for addressing said memory means with said digital Hall output and temperature dependent signals to generate a temperature compensated Hall element voltage. - View Dependent Claims (8, 9)
- means for measuring the temperature of said Hall element;
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4. A device for measuring a parameter associated with the magnetic flux generated by a line current, comprising a Hall element to be located in proximity to said line in exposure to said magnetic field, said Hall element being connected to generate a Hall voltage as a function of a Hall element control current and the magnitude of a magnetic field density of said magnetic field, said Hall voltage further being a function of temperature;
- means for measuring the temperature of said Hall element;
means responsive to said temperature measuring means for generating a temperature dependent digital signal;
memory means containing Hall voltage compensation data as a function of Hall element temperature;
means for addressing said memory means with said temperature dependent digital signal to generate therefrom a correction voltage corresponding to Hall element temperature;
means for combining said correction voltage with said Hall element voltage to provide a temperature compensated Hall voltage;
means for converting said compensated voltage to a signal corresponding to said parameter; and
means for supplying said parameter signal to an output means. - View Dependent Claims (10, 11, 12)
- means for measuring the temperature of said Hall element;
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5. A device for measuring a parameter associated with magnetic flux generated by a line current, comprising a Hall element to be located in proximity to said line in exposure to said magnetic field, said Hall element being connected to generate a Hall voltage as a function of a Hall element control current and the magnetic flux density of the magnetic field, said Hall voltage further being a function of temperature;
- means for measuring the temperature of said Hall element;
means responsive to said temperature measurement means for generating a temperature dependent digital signal;
means for converting said Hall voltage to a Hall digital signal;
memory means having storage locations containing temperature compensated Hall voltage data as a function of Hall element voltage and temperature;
means for addressing said memory means with said digital Hall and temperature dependent signals to generate a temperature compensated Hall element voltage;
means for converting said temperature compensated Hall voltage to a signal corresponding to said parameter; and
means for supplying said parameter signal to an output means.
- means for measuring the temperature of said Hall element;
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13. In a device for measuring a parameter associated with the magnetic flux generated by a line current using a Hall element connected to generate a Hall voltage as a function of a Hall element control current and of the density of said magnetic flux wherein the Hall voltage is further a function of Hall element temperature, a method of temperature compensating the Hall voltage comprising the steps of storing in storage locations of a memory means Hall voltage compensation data as a function of Hall element temperature;
- measuring Hall element temperature, and in response generating a temperature depedent voltage;
addressing said memory means with said temperature dependent voltage to generate therefrom corresponding temperature compensation data;
converting said generated temperature compensation data to a corresponding temperature compensation voltage; and
combining said temperature compensation voltage with said Hall voltage to obtain the temperature compensated Hall voltage. - View Dependent Claims (15, 16, 17, 18)
- measuring Hall element temperature, and in response generating a temperature depedent voltage;
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14. In a device for measuring a parameter associated with the magnetic flux generated by a line current using a Hall element connected to generate a Hall voltage as a function of a Hall element control current and of the density of said magnetic flux wherein the Hall voltage is further a function of Hall element temperature, a method of temperature compensating the Hall voltage comprising the steps of storing in storage locations of a memory means temperature compensated Hall voltage data as a function of Hall element voltage and temperature;
- measuring the temperature of said Hall element and in response generating a Hall element temperature dependent voltage;
digitalizing said Hall voltage and said Hall element temperature dependent voltage; and
addressing said memory means with said digitalized voltages to generate therefrom a corresponding temperature compensated Hall voltage.
- measuring the temperature of said Hall element and in response generating a Hall element temperature dependent voltage;
Specification