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NTC thermistor linear sampling circuit based on current mirror

A thermistor and linear sampling technology, which is applied in the direction of directly heat-sensitive electrical/magnetic element thermometers, measuring heat, and using electrical devices, can solve the problems of inaccurate temperature detection and inability to accurately obtain resistance values, etc. Improve the accuracy of temperature sampling and achieve the effect of linearly collecting temperature

Pending Publication Date: 2020-04-28
CHANGZHOU XINGYU AUTOMOTIVE LIGHTING SYST
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Problems solved by technology

Since the resistance value of the NTC thermistor (negative temperature coefficient thermistor) decreases with the increase of temperature, the sampling voltage and the resistance value of the NTC thermistor have a nonlinear relationship, and the current NTC thermistor cannot be accurately obtained from the sampling voltage. resistance value, resulting in inaccurate temperature detection

Method used

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  • NTC thermistor linear sampling circuit based on current mirror
  • NTC thermistor linear sampling circuit based on current mirror
  • NTC thermistor linear sampling circuit based on current mirror

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0016] The present invention proposes a kind of NTC thermistor linear sampling circuit based on current mirror, such as figure 1 As shown, it includes a reference current generating circuit, a positive polarity current mirror, a negative polarity current mirror and an NTC sampling resistor R3. The reference current generating circuit generates a reference current Iref, which is copied once by the negative polarity current mirror and then copied by the positive polarity current mirror. At this time, the output current Iout of the sampling terminal is equal to the reference current Iref, and the sampling terminal samples the voltage at both ends of the NTC thermistor R3 and outputs the voltage Vout, since the output current Iout of the sampling terminal has been determined by the reference current generating circuit at the front end , the output current I...

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Abstract

The invention discloses an NTC thermistor linear sampling circuit based on a current mirror and belongs to the field of hardware circuit design. The circuit comprises a reference current generation circuit, two basic current mirrors and an NTC sampling resistor R3. The reference current generation circuit generates reference current Iref; the reference current Iref is copied to a sampling end through the two basic current mirrors; at the moment, an output current Iout of the sampling end is equal to the reference current Iref; the sampling end samples the voltage at two ends of an NTC thermistor R3 and outputs the voltage Vout, the resistance value of the NTC thermistor R3 is obtained, then the current temperature is obtained according to the relation between the resistance value of the NTC thermistor R3 and the temperature, and therefore, the linear sampling of the temperature is achieved. The sampling voltage and the resistance value of the NTC thermistor are in a linear relation, and compared with a traditional voltage division circuit, the temperature sampling accuracy is improved.

Description

technical field [0001] The invention belongs to the field of hardware circuit design, in particular to an NTC thermistor linear sampling circuit based on a current mirror. Background technique [0002] At present, the traditional NTC (Negative Temperature Coefficient) thermistor sampling circuit is composed of an ordinary resistor and an NTC thermistor in series, that is, the above-mentioned ordinary resistor and the NTC thermistor form a voltage divider circuit, which is carried out at both ends of the NTC thermistor. voltage sampling. Since the resistance value of the NTC thermistor (negative temperature coefficient thermistor) decreases with the increase of temperature, the sampling voltage and the resistance value of the NTC thermistor have a nonlinear relationship, and the current NTC thermistor cannot be accurately obtained from the sampling voltage. resistance value, resulting in inaccurate temperature detection. Contents of the invention [0003] In order to solv...

Claims

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Application Information

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IPC IPC(8): G01K7/25
CPCG01K7/25
Inventor 柴正王越徐宝奇姚肖勇
Owner CHANGZHOU XINGYU AUTOMOTIVE LIGHTING SYST
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