CN210638713U - Sensor temperature compensation circuit - Google Patents
Sensor temperature compensation circuit Download PDFInfo
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- CN210638713U CN210638713U CN201920861023.XU CN201920861023U CN210638713U CN 210638713 U CN210638713 U CN 210638713U CN 201920861023 U CN201920861023 U CN 201920861023U CN 210638713 U CN210638713 U CN 210638713U
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Abstract
The utility model provides a sensor temperature compensation circuit, which comprises a sensor to be compensated, an input signal amplification sub-circuit, a temperature conversion sub-circuit, a multiplication proportion sub-circuit and an addition sub-circuit, wherein the output end of the sensor to be compensated is electrically connected with the input ends of the input signal amplification sub-circuit and the multiplication proportion sub-circuit respectively; the output end of the input signal amplifying sub-circuit is electrically connected with the first input end of the adding sub-circuit; the output end of the temperature conversion sub-circuit is electrically connected with the input end of the multiplication proportion sub-circuit, and the output end of the multiplication proportion sub-circuit is also electrically connected with the second input end of the addition sub-circuit; the input signal amplification sub-circuit amplifies the output signal of the sensor to be compensated in proportion; the temperature conversion sub-circuit converts the detected temperature into a voltage signal; the multiplication ratio example circuit outputs temperature compensation quantity according to the input of the sensor to be compensated and the temperature conversion sub-circuit; and the output signal of the sensor to be compensated is accumulated with the temperature compensation amount through the addition sub-circuit.
Description
Technical Field
The utility model relates to a sensor field especially relates to a sensor temperature compensation circuit.
Background
The sensor can sensitively sense the change of factors such as magnetic field, current, pressure, temperature and light intensity in the environment, so as to generate a voltage or current signal for subsequent detection and analysis, and the sensor is widely applied to various measurement scenes. The sensitivity of the sensor is greatly influenced by temperature change, so that the overall performance and the measurement precision of the sensor are deviated, and the sensor cannot play a due role.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a can carry out temperature compensation, improve its sensitivity's sensor temperature compensation circuit to the sensor.
The technical scheme of the utility model is realized like this: a sensor temperature compensation circuit comprises a sensor (1) to be compensated, an input signal amplification sub-circuit (2), a temperature conversion sub-circuit (3), a multiplication ratio example circuit (4) and an addition sub-circuit (5), wherein the output end of the sensor (1) to be compensated is electrically connected with the input ends of the input signal amplification sub-circuit (2) and the multiplication ratio sub-circuit (4) respectively; the output end of the input signal amplifying sub-circuit (2) is electrically connected with the first input end of the adding sub-circuit (5); the output end of the temperature conversion sub-circuit (3) is electrically connected with the input end of the multiplication proportion sub-circuit (4), and the output end of the multiplication proportion example circuit (4) is also electrically connected with the second input end of the addition sub-circuit (5); the input signal amplification sub-circuit (2) is used for carrying out proportional amplification on an output signal of the sensor (1) to be compensated; the temperature conversion sub-circuit (3) converts the detected temperature into a voltage signal; the multiplication ratio example circuit (4) outputs a temperature compensation quantity according to the input of the sensor (1) to be compensated and the temperature conversion sub-circuit (3); the output signal of the sensor (1) to be compensated is accumulated with the temperature compensation quantity through an addition sub-circuit (5).
On the basis of the above technical solution, preferably, the input signal amplifying sub-circuit (2) includes an operational amplifier a1, the output terminal of the sensor (1) to be compensated is electrically connected to one end of a resistor R2, the other end of the resistor R2 is electrically connected to the inverting input terminal of the operational amplifier a1, and the inverting input terminal of the operational amplifier a1 is grounded; a resistor R1 is arranged between the output end and the reverse input section of the transport amplifier A1 in parallel; the output end of the operational amplifier A1 is electrically connected with the first input end of the adder sub-circuit (5).
On the basis of the above technical solution, preferably, the temperature conversion sub-circuit (3) includes a temperature sensor TMP36, an operational amplifier a2, an in-phase multiplier and a 2.7V power supply, and an output terminal of the temperature sensor TMP36 and an output terminal of the in-phase multiplier are both electrically connected to an inverting input terminal of the operational amplifier a 2; the 2.7V power supply is electrically connected with one end of the adjustable resistor R5, and the adjusting end of the adjustable resistor R5 and the output end of the operational amplifier A2 are connected in parallel at the reverse input end of the in-phase multiplier; the output end of the operational amplifier A2 is also electrically connected with the input end of the multiplication proportion sub-circuit (4).
On the basis of the technical scheme, preferably, the multiplication proportion sub-circuit (4) comprises a multiplication circuit and an attenuation circuit, and a first input end and a second input end of the multiplication circuit are respectively and electrically connected with an output end of the sensor (1) to be compensated and an output end of the temperature conversion sub-circuit (3); the output end of the multiplication circuit is electrically connected with the input end of the attenuation circuit, and the output end of the attenuation circuit is electrically connected with the second input end of the addition sub-circuit (5).
Further preferably, the multiplication circuit comprises a multiplier MC1594, and a pin 9 of the multiplier MC1594 is electrically connected with the output end of the sensor (1) to be compensated; the pin 10 of the multiplier MC1594 is electrically connected with the output end of the temperature conversion sub-circuit (3); pin 14 of multiplier MC1594 is electrically connected to the input of the attenuator circuit.
Further preferably, the multiplication circuit further comprises a pre-stage filter circuit, the pre-stage filter circuit is an RC parallel filter circuit, and the pre-stage filter circuit is connected to the pin 9 and the pin 10 of the multiplier MC1594 respectively.
Still more preferably, the attenuator circuit includes an operational amplifier A3 and an operational amplifier a4, an inverting input terminal of the operational amplifier A3 is electrically connected to the pin 14 of the multiplier MC 1594; two ends of the resistor R9 are respectively electrically connected with the inverting input end and the output end of the operational amplifier A3; the non-inverting input end of the operational amplifier A3 is connected with a grounding resistor R10 in series and then grounded; the output end of the operational amplifier A3 is electrically connected with the voltage-dividing resistor R13, the voltage-dividing resistor R13 is also electrically connected with the non-inverting input end of the operational amplifier A4, a resistor R12 is connected between the inverting input end and the output end of the operational amplifier A4 in parallel, and the output end of the operational amplifier A4 is also electrically connected with the second input end of the adder sub-circuit (5).
Based on the above technical solution, preferably, the adder sub-circuit (5) includes an operational amplifier a5, a first input terminal and a second input terminal of the adder sub-circuit (5) are both connected in parallel to an inverting input terminal of the operational amplifier a5, and a resistor R16 is further connected in parallel between the inverting input terminal of the operational amplifier a5 and the output terminal of the operational amplifier a 5.
The utility model provides a pair of sensor temperature compensation circuit for prior art, has following beneficial effect:
(1) the utility model realizes the temperature compensation of the sensor to be compensated through the closed loop temperature compensation;
(2) the input signal amplifying sub-circuit can amplify the output signal of the sensor to be compensated in proportion;
(3) the temperature conversion sub-circuit can output a voltage signal according to the change of the temperature;
(4) the multiplication proportion sub-circuit carries out analog multiplication on the output of the sensor to be compensated and the output of the temperature conversion sub-circuit to obtain feedback quantity, and then carries out output attenuation through the attenuation circuit to obtain the required feedback quantity.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a structural diagram of a sensor temperature compensation circuit according to the present invention;
fig. 2 is a wiring diagram of a sensor to be compensated and an input signal amplifying sub-circuit of the sensor temperature compensation circuit of the present invention;
fig. 3 is a wiring diagram of a temperature conversion sub-circuit of the sensor temperature compensation circuit of the present invention;
fig. 4 is a wiring diagram of a multiplication ratio sub-circuit of the sensor temperature compensation circuit of the present invention;
fig. 5 is a wiring diagram of an adder sub-circuit of the sensor temperature compensation circuit of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.
As shown in fig. 1, the utility model provides a sensor temperature compensation circuit, including waiting to compensate sensor 1, input signal amplification sub-circuit 2, temperature conversion sub-circuit 3, multiplication ratio example circuit 4 and addition sub-circuit 5. The output end of the sensor to be compensated 1 is electrically connected with the input ends of the input signal amplification sub-circuit 2 and the multiplication proportion sub-circuit 4 respectively; the output end of the input signal amplifying sub-circuit 2 is electrically connected with the first input end of the adding sub-circuit 5; the output end of the temperature conversion sub-circuit 3 is electrically connected with the input end of the multiplication ratio example circuit 4, and the output end of the multiplication ratio example circuit 4 is also electrically connected with the second input end of the addition sub-circuit 5; the input signal amplification sub-circuit 2 amplifies the output signal of the sensor 1 to be compensated in proportion; the temperature conversion sub-circuit 3 converts the detected temperature into a voltage signal; the multiplication proportion sub-circuit 4 outputs temperature compensation quantity according to the input of the sensor 1 to be compensated and the temperature conversion sub-circuit 3; the output signal of the sensor 1 to be compensated is accumulated with the temperature compensation amount by the addition sub-circuit 5. The temperature conversion sub-circuit 3 converts the current ambient temperature detected by the temperature sensor into a compensation amount. After the compensation quantity and the output of the sensor 1 to be compensated are processed by the multiplication proportion sub-circuit 4, the voltage compensation is carried out on the signal of the compensation sensor 1 amplified by the input signal amplification sub-circuit 2.
As shown in FIG. 1 in conjunction with FIG. 2, input signal amplificationThe sub-circuit 2 comprises an operational amplifier A1, the output end of the sensor 1 to be compensated is electrically connected with one end of a resistor R2, the other end of the resistor R2 is electrically connected with the reverse input end of the operational amplifier A1, and the same-direction input end of the operational amplifier A1 is grounded; a resistor R1 is arranged between the output end and the reverse input section of the transport amplifier A1 in parallel; the output terminal of the operational amplifier a1 is electrically connected to the first input terminal of the adder sub-circuit 5. The transport amplifier A1, the resistor R1 and the resistor R2 form a reverse proportion amplifying circuit, and the output voltage VO of the sensor 1 to be compensated1The magnification is R1/R2. I.e. the amplification depends on the resistance values of the resistor R1 and the resistor R2.
As shown in fig. 1 and fig. 3, the temperature conversion sub-circuit 3 includes a temperature sensor TMP36, an operational amplifier a2, an in-phase multiplier and a 2.7V power supply, wherein an output terminal of the temperature sensor TMP36 and an output terminal of the in-phase multiplier are electrically connected to an inverting input terminal of the operational amplifier a 2; the 2.7V power supply is electrically connected with one end of the adjustable resistor R5, and the adjusting end of the adjustable resistor R5 and the output end of the operational amplifier A2 are connected in parallel at the reverse input end of the in-phase multiplier; the output terminal of the operational amplifier a2 is also electrically connected to the input terminal of the multiplier-proportional sub-circuit 4. TMP36 is an analog temperature sensor from AD corporation, providing a voltage output VX that is linearly proportional to temperature in degrees Celsius1. After the voltage of a 2.7V power supply is divided by an adjustable resistor R5, VX is input2As input Vx of the non-inverting multiplier, output voltage VO of output end of operational amplifier A23As input Vy to the in-phase multiplier, which outputs VO2. In the figure, an operational amplifier a2, an in-phase multiplier, a resistor R3, and a resistor R4 constitute a division circuit, and have the following conversion relationship: i.e. i3＝VX1/R3,i4＝-VO2/R4,i3＝i4,VO3＝R4·VX1/(K·R3)·VX2. K is the proportionality coefficient of the in-phase multiplier and is more than 0.
As shown in fig. 4, the multiplication ratio example circuit 4 includes a multiplication circuit and an attenuation circuit, and a first input end and a second input end of the multiplication circuit are electrically connected with an output end of the sensor 1 to be compensated and an output end of the temperature conversion sub-circuit 3, respectively; the output end of the multiplication circuit is electrically connected with the input end of the attenuation circuit, and the output end of the attenuation circuit is electrically connected with the second input end of the addition sub-circuit 5.
The multiplying circuit comprises a multiplier MC1594, and a pin 9 of the multiplier MC1594 is electrically connected with the output end of the sensor 1 to be compensated; the pin 10 of the multiplier MC1594 is electrically connected with the output end of the temperature conversion sub-circuit 3; pin 14 of multiplier MC1594 is electrically connected to the input of the attenuator circuit.
The multiplication circuit further comprises a pre-stage filter circuit which is an RC parallel filter circuit, and the pre-stage filter circuit is respectively connected with a pin 9 and a pin 10 of the multiplier MC 1594.
The attenuation circuit comprises an operational amplifier A3 and an operational amplifier A4, wherein the inverting input end of the operational amplifier A3 is electrically connected with a pin 14 of a multiplier MC 1594; two ends of the resistor R9 are respectively electrically connected with the inverting input end and the output end of the operational amplifier A3; the non-inverting input end of the operational amplifier A3 is connected with a grounding resistor R10 in series and then grounded; the output end of the operational amplifier A3 is electrically connected with the voltage-dividing resistor R13, the voltage-dividing resistor R13 is also electrically connected with the non-inverting input end of the operational amplifier a4, a resistor R12 is connected in parallel between the inverting input end and the output end of the operational amplifier a4, and the output end of the operational amplifier a4 is also electrically connected with the second input end of the adder sub-circuit 5. The multiplier MC1594 is a four-quadrant analog multiplier that combines the output of the sensor 1 to be compensated and the output voltage VO of the output of the operational amplifier A23Gain is carried out to obtain output VO4Then to VO4Attenuation and compensation are carried out, and an operational amplifier A3 and resistors R8 and R9 form an attenuation circuit; the operational amplifier A4 and the resistor R12 form a forward buffer circuit to adjust the gain of the multiplier MC1594 to obtain VO5。
As shown in fig. 5, the adder sub-circuit 5 includes an operational amplifier a5, the first input terminal and the second input terminal of the adder sub-circuit 5 are connected in parallel to the inverting input terminal of the operational amplifier a5, and a resistor R16 is connected in parallel between the inverting input terminal of the operational amplifier a5 and the output terminal of the operational amplifier a 5. The operational amplifier A5 and the resistors R15, R16 and R17 form an addition operational circuit, VOUT-R16 ·(VO5/R14+VO1/R15). Namely, the sensor output signal VOUT after temperature compensation is obtained.
The multiplier MC1594 in this embodiment may be replaced by another four-quadrant multiplier. The operational amplifiers a1, a2, A3, a4 and a5 can all adopt common operational amplifiers such as LM358 or OP 07. The sensor 1 to be compensated may be a sensor that outputs a continuous analog signal.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A sensor temperature compensation circuit, characterized by: the sensor comprises a sensor (1) to be compensated, an input signal amplification sub-circuit (2), a temperature conversion sub-circuit (3), a multiplication ratio example circuit (4) and an addition sub-circuit (5), wherein the output end of the sensor (1) to be compensated is electrically connected with the input ends of the input signal amplification sub-circuit (2) and the multiplication ratio sub-circuit (4) respectively; the output end of the input signal amplifying sub-circuit (2) is electrically connected with the first input end of the adding sub-circuit (5); the output end of the temperature conversion sub-circuit (3) is electrically connected with the input end of the multiplication proportion sub-circuit (4), and the output end of the multiplication proportion example circuit (4) is also electrically connected with the second input end of the addition sub-circuit (5); the input signal amplification sub-circuit (2) is used for carrying out proportional amplification on an output signal of the sensor (1) to be compensated; the temperature conversion sub-circuit (3) converts the detected temperature into a voltage signal; the multiplication ratio example circuit (4) outputs a temperature compensation quantity according to the input of the sensor (1) to be compensated and the temperature conversion sub-circuit (3); the output signal of the sensor (1) to be compensated is accumulated with the temperature compensation quantity through an addition sub-circuit (5).
2. A sensor temperature compensation circuit as claimed in claim 1, wherein: the input signal amplification sub-circuit (2) comprises an operational amplifier A1, the output end of the sensor (1) to be compensated is electrically connected with one end of a resistor R2, the other end of the resistor R2 is electrically connected with the reverse input end of an operational amplifier A1, and the same-direction input end of the operational amplifier A1 is grounded; a resistor R1 is arranged between the output end and the reverse input section of the transport amplifier A1 in parallel; the output end of the operational amplifier A1 is electrically connected with the first input end of the adder sub-circuit (5).
3. A sensor temperature compensation circuit as claimed in claim 1, wherein: the temperature conversion sub-circuit (3) comprises a temperature sensor TMP36, an operational amplifier A2, an in-phase multiplier and a 2.7V power supply, wherein the output end of the temperature sensor TMP36 and the output end of the in-phase multiplier are both electrically connected with the reverse input end of the operational amplifier A2; the 2.7V power supply is electrically connected with one end of the adjustable resistor R5, and the adjusting end of the adjustable resistor R5 and the output end of the operational amplifier A2 are connected in parallel at the reverse input end of the in-phase multiplier; the output end of the operational amplifier A2 is also electrically connected with the input end of the multiplication proportion sub-circuit (4).
4. A sensor temperature compensation circuit as claimed in claim 1, wherein: the multiplication proportion sub-circuit (4) comprises a multiplication circuit and an attenuation circuit, and a first input end and a second input end of the multiplication circuit are respectively and electrically connected with an output end of the sensor (1) to be compensated and an output end of the temperature conversion sub-circuit (3); the output end of the multiplication circuit is electrically connected with the input end of the attenuation circuit, and the output end of the attenuation circuit is electrically connected with the second input end of the addition sub-circuit (5).
5. A sensor temperature compensation circuit according to claim 4, wherein: the multiplying circuit comprises a multiplier MC1594, and a pin 9 of the multiplier MC1594 is electrically connected with the output end of the sensor (1) to be compensated; the pin 10 of the multiplier MC1594 is electrically connected with the output end of the temperature conversion sub-circuit (3); pin 14 of multiplier MC1594 is electrically connected to the input of the attenuator circuit.
6. A sensor temperature compensation circuit according to claim 5, wherein: the multiplication circuit further comprises a pre-stage filter circuit, the pre-stage filter circuit is an RC parallel filter circuit, and the pre-stage filter circuit is respectively connected with a pin 9 and a pin 10 of the multiplier MC 1594.
7. A sensor temperature compensation circuit according to claim 5, wherein: the attenuation circuit comprises an operational amplifier A3 and an operational amplifier A4, wherein the inverting input end of the operational amplifier A3 is electrically connected with a pin 14 of a multiplier MC 1594; two ends of the resistor R9 are respectively electrically connected with the inverting input end and the output end of the operational amplifier A3; the non-inverting input end of the operational amplifier A3 is connected with a grounding resistor R10 in series and then grounded; the output end of the operational amplifier A3 is electrically connected with the voltage-dividing resistor R13, the voltage-dividing resistor R13 is also electrically connected with the non-inverting input end of the operational amplifier A4, a resistor R12 is connected between the inverting input end and the output end of the operational amplifier A4 in parallel, and the output end of the operational amplifier A4 is also electrically connected with the second input end of the adder sub-circuit (5).
8. A sensor temperature compensation circuit as claimed in claim 1, wherein: the addition sub-circuit (5) comprises an operational amplifier A5, a first input end and a second input end of the addition sub-circuit (5) are connected in parallel to an inverting input end of an operational amplifier A5, and a resistor R16 is connected in parallel between the inverting input end of the operational amplifier A5 and the output end of the operational amplifier A5.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920861023.XU CN210638713U (en) | 2019-06-10 | 2019-06-10 | Sensor temperature compensation circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920861023.XU CN210638713U (en) | 2019-06-10 | 2019-06-10 | Sensor temperature compensation circuit |
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| CN210638713U true CN210638713U (en) | 2020-05-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110174125A (en) * | 2019-06-10 | 2019-08-27 | 武汉湖滨电器有限公司 | A kind of Sensor Temperature Compensation circuit |
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2019
- 2019-06-10 CN CN201920861023.XU patent/CN210638713U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110174125A (en) * | 2019-06-10 | 2019-08-27 | 武汉湖滨电器有限公司 | A kind of Sensor Temperature Compensation circuit |
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