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NTC temperature linear sampling circuit

A sampling circuit and linearization technology, used in thermometers, thermometers using electrical devices, and thermometers with electrical/magnetic components that are directly sensitive to heat, etc. The effect of parameter tuning is concise

Active Publication Date: 2019-10-15
SANJIANG UNIVERSITY
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  • Description
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  • Application Information

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Problems solved by technology

And the collected temperature is also non-linear, therefore, it is fundamentally impossible to use NTC to collect temperature

Method used

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  • NTC temperature linear sampling circuit

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Experimental program
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Embodiment 1

[0061] by figure 1 The reference diagram of the linearized sampling circuit shown is the main module, which is based on zero degrees, and collects the difference between the current temperature and zero degrees, and the measured temperature is recorded as t(R 0 ); set up a linearized sampling circuit in the same way, the R in the original module 0 change to R 50 , the module collects the difference between the current temperature and 50 degrees based on 50 degrees, and records the measured temperature as t(R 50 ).

[0062] because and Equal; and they are all expected to be equal to 25, so by adjusting the hardware circuit, their count values ​​are all equal to 25, that is, the temperature distance difference between the normal temperature of 25 degrees and the two reference points is equal to 50-25=25-0; the actual measurement when t(R 0 )+t(R 50 ) and may not be equal to 50, through the linear compensation algorithm, make up for t(R 0 ) measurement error, calculate ...

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Abstract

The invention discloses an NTC temperature linear sampling circuit, comprising a resistive voltage division circuit, a voltage comparison circuit and a trigger; the voltage comparison circuit comprises a first comparator and a second comparator; the positive input ends of the first comparator and the second comparator are jointly connected, connected with the output end of the trigger via a feedback resistor, and earthed via a capacitor; the output end of the first comparator is connected with the threshold end of the trigger, and the output end of the second comparator is connected with the triggering end of the trigger; a power supply voltage is separately connected with the reverse input end of the first comparator and the reverse input end of the second comparator after being subjectedto voltage division performed by resistive voltage division circuit. The circuit converts the resistance-temperature relation, which is a transcendental function, of the NTC into a linear relation, so that the accuracy of temperature collected by using the NTC is greatly improved; the circuit is flexible and convenient to control and concise in parameter setting.

Description

technical field [0001] The invention relates to an NTC temperature linearization sampling circuit, which belongs to the technical field of sampling circuits. Background technique [0002] At present, the usual methods for collecting temperature are: using physical thermometers, electronic thermometers, and PT linear resistance; in industry, thermocouples are also used to collect temperature changes in equipment; all methods of these temperature collections are inseparable from a common requirement: the desired collection The temperature is uniform and linear, and the temperature collected in this way helps to improve our predictability of temperature changes; at the same time, it improves the control accuracy of the temperature of various types of equipment at all levels. At present, the more commonly used linear temperature sensor DS18B20 adopts a single-bus design. Although it has high precision, due to technical protection, there is no comparable temperature collector in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K7/25
CPCG01K7/25
Inventor 王枢华花怀海
Owner SANJIANG UNIVERSITY
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