Digital module with temperature compensating function and temperature compensating method thereof

Abstract

The invention discloses a temperature compensating method of a digital module with a temperature compensating function. The digital module comprises a one-chip microcomputer interface circuit, and a temperature measurement and reference voltage circuit connecting with the one-chip microcomputer interface circuit. An interface of the temperature measurement and reference voltage circuit is in external connection with a digital temperature sensor. The temperature compensating method includes a zero temperature compensating method and a sensitivity temperature compensating method, and is characterized in that the zero compensation adopts a point-slope form formula: AD compensation dosage=K(TX-T Fsign)+AD Z; the sensitivity compensation adopts the formula: N<output>=N<actual measurement>-((N<actual measurement>-N<datum point>)*K<per Kg>+K<datum point>*(T<actual measurement>-T<datum point>).

Description

technical field [0001] The invention relates to a digital module, especially a digital module with a temperature compensation function, and also relates to a method for temperature compensation of the digital module. Background technique [0002] The load cell is a device that converts the quality signal into a measurable electrical signal output. Due to the influence of various internal influencing factors and external environmental conditions, its output characteristics will greatly deviate from the ideal output characteristics. In order to improve the weighing To improve the comprehensive performance index of the heavy sensor, various compensation measures must be taken. [0003] The load cell has 6 major compensations, which are zero point compensation, zero point temperature compensation, sensitivity compensation, sensitivity temperature compensation, nonlinear compensation and input resistance standardization adjustment. The traditional compensation method requires mo...

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Problems solved by technology

The traditional compensation method requires more than ten components, all of which are manually tested and welded. This method not only complicates the structure of the sensor, but also generally requires testing at multiple temperatures such as -10°C, 20°C and 40°C. Alternating test, the test time is generally 22 hours per piece, of which the temperature rise and fall of the load cell and the heat preservation time are about 19 hours, due to the long auxiliary time of heat balance, the whole test time is long, not only the energy consumption is large, but also Low production efficiency

[0004] The above is an analog load cell. At present, there is a digital load cell, which adds a digital module on the basis of the load cell, and converts the analog voltage signal into a digital signal for transmission. The digital sensor can use software to realize non-linearity. Compensation and input resistance standardization adjustment, but other compensations still need to be implemented in an analog way, and there are still problems such as the above-mentioned analog load cell

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