A Hall sensor temperature compensation circuit and its compensation method
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A technology of temperature compensation circuit and Hall sensor, which is applied in the field of sensors, can solve problems such as unsuitable compensation and calibration, and achieve the effects of fast response speed, low process dependence and high precision
Active Publication Date: 2022-03-08
NINGBO CRRC TIMES TRANSDUCER TECH CO LTD
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Problems solved by technology
At present, most Hall sensor chips use analog compensation technology, such as piezoresistors, etc., which can adjust the sensitivity and the offset of the output zero point with temperature, but this is often at the expense of the sensitivity and the accuracy of the output zero point.
In addition, the analog compensation technology is fixed, not suitable for compensation and calibration of production or field changes
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Embodiment 1
[0042] Such as Figure 1 to Figure 3 As shown, the present invention provides a Hall sensor temperature compensation circuit, including:
[0043] Hall sensor module, which generates analog voltage signal according to external magnetic field and current;
[0044] The analog compensation module is connected with the Hall sensing module, and is used for analog compensation to the generated analog voltage signal;
[0045] The temperature sensor module is used to obtain the current external environment temperature information;
[0046] An output module, configured to convert the analog voltage signal after analog compensation to output a digital voltage signal;
[0047] A digital compensation module, which includes a compensation calculation unit, the compensation calculation unit generates a corresponding compensation codeword according to the external environment temperature information, and the compensation codeword includes a gain codeword and a drift codeword, and then the g...
Embodiment 2
[0076] The present invention also provides a Hall sensor temperature compensation control method. According to the compensation circuit according to the first embodiment, the external temperature is measured and the Hall sensor is temperature compensated.
[0077] It should be noted that, in the present invention, descriptions involving "first", "second", "one" and so on are only for descriptive purposes, and should not be understood as indicating or implying their relative importance or implicitly indicating The number of technical characteristics. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined. The terms "connection" and "fixation" should be interpreted in a broad sense, for example, "fixation" can be a fixed connection, a detachable connection, or an integral bod...
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Abstract
The invention provides a Hall sensor temperature compensation circuit and a compensation method thereof, belonging to the technical field of sensors, including a Hall sensor module, which generates an analog voltage signal according to an external magnetic field and current; an analog compensation module, which is connected to the Hall sensor module The connection is used to perform analog compensation on the generated analog voltage signal; the digital compensation module includes a compensation calculation unit, and the compensation calculation unit obtains a compensation code word according to the external environment temperature information, and then uses the compensation code word to perform gain compensation on the analog compensation process, and Perform drift compensation for the analog-to-digital conversion process. The present invention adopts the combination of digital and analog compensation for temperature compensation, which has low dependence on the process, makes the Hall sensor have higher precision, better circuit consistency, less storage space required, and faster response speed of the output signal. And the compensation range is larger, which is convenient for design and implementation and customer application.
Description
technical field [0001] The invention belongs to the technical field of sensors, and relates to a Hall sensor, in particular to a Hall sensor temperature compensation circuit and a compensation method thereof. Background technique [0002] In the field of magnetic field sensors, a Hall sensor is a semiconductor device designed using the Hall effect. Its characteristic is that it can convert an external magnetic field signal into a voltage signal, and the magnitude of the signal is proportional to the magnitude of the external magnetic field signal. As a semiconductor device, it has obvious disadvantages, that is, the output voltage signal will drift with the change of the external environment temperature. This kind of temperature drift is not obvious at normal temperature, but the temperature drift may affect the working performance of the magnetic sensor system at high and low temperatures, so the purpose of the temperature compensation circuit is to eliminate the temperatur...
Claims
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