CN213336542U - Temperature sensing device - Google Patents
Temperature sensing device Download PDFInfo
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- CN213336542U CN213336542U CN202021907805.1U CN202021907805U CN213336542U CN 213336542 U CN213336542 U CN 213336542U CN 202021907805 U CN202021907805 U CN 202021907805U CN 213336542 U CN213336542 U CN 213336542U
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Abstract
The utility model discloses a temperature sensing device, at first two bleeder circuit have in this application, differential amplifier can do the difference with two bleeder circuit's sampling voltage, because the electric wire line resistance among two bleeder circuit under the normal condition is more close, consequently can offset the voltage value that the line resistance divides in two bleeder circuit after doing the difference, do the poor result and also the voltage value that the resistance variation volume that thermistor produced along with the temperature value change of target point corresponds, and do not contain the voltage value that the line resistance corresponds, consequently, through the temperature value of calculating after enlargiing it more accurate.
Description
Technical Field
The utility model relates to a temperature measurement field especially relates to a temperature sensing device.
Background
In the prior art, a voltage dividing circuit composed of a common resistor with a fixed resistance and a thermistor is usually adopted to detect the temperature of a target point, the thermistor can be arranged close to the target point, the voltage value of the middle point of the two resistors of the voltage dividing circuit is sampled, then the actual resistance value of the thermistor is calculated according to the voltage value and the resistance value of the fixed resistor, then the temperature value of the target point corresponding to the actual resistance value is determined according to the corresponding relation between the resistance value of the thermistor and the temperature, but the actual resistance value is only the resistance value of the thermistor in an ideal state, under the real condition, the actual resistance value additionally comprises a wire resistor of an electric wire used for connecting the thermistor, namely the determined actual resistance value is not the actual resistance value of the thermistor, so that the temperature value determined according to the corresponding relation between the resistance value of the thermistor and the temperature is not accurate enough, the accuracy of temperature detection is poor.
Therefore, how to provide a solution to the above technical problem is a problem that needs to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a temperature sensing device has eliminated the line resistance and has detected the influence to the temperature, has improved the accuracy that the temperature detected.
In order to solve the technical problem, the utility model provides a temperature sensing device, include:
the voltage stabilizing power supply is respectively connected with the first voltage dividing circuit and the second voltage dividing circuit and is used for simultaneously providing voltage with a stable value for the first voltage dividing circuit and the second voltage dividing circuit;
the first voltage division circuit including a first fixed resistor and a thermistor;
the second voltage division circuit including a second fixed resistance and a third fixed resistance;
and the differential amplification circuit is used for differentiating and amplifying the voltage values of the two intermediate points of the first voltage division circuit and the second voltage division circuit so as to calculate the temperature value of the target point where the thermistor is located through the differential amplification circuit.
Preferably, the thermistor is a three-wire thermistor;
the positive pole of constant voltage power supply respectively with the first end of first fixed resistor and the first end of second fixed resistor is connected, the second end of first fixed resistor with thermistor's first end is connected, the second end of second fixed resistor with the first end of third fixed resistor is connected, thermistor's second end respectively with the second end of third fixed resistor and constant voltage power supply's negative pole is connected.
Preferably, the first fixed resistor and the second fixed resistor have the same resistance, and the third fixed resistor has the same resistance as the thermistor at the standard temperature.
Preferably, the temperature sensing device further comprises:
the first end is connected with the output end of the differential amplification circuit, the second end is used for being connected with a voltage clamping circuit of the processor, and the voltage clamping circuit is used for clamping the voltage value output by the differential amplifier within a preset value so as to prevent the processor at the rear end from being damaged.
Preferably, the voltage clamp circuit comprises a first diode, a second diode and a clamp power supply;
the anode of the first diode is grounded, the cathode of the first diode and the anode of the second diode are used as the first end and the second end of the voltage clamping resistor, and the cathode of the second diode is connected with the clamping power supply.
Preferably, the temperature sensing device further comprises:
and the low-pass filter is used for filtering high-frequency interference suffered by electric energy in the circuit, and the first end of the low-pass filter is connected with the output end of the differential amplification circuit, and the second end of the low-pass filter is connected with the first end of the voltage clamping circuit.
Preferably, the low-pass filter includes a fourth fixed resistor and a capacitor;
the first end of the fourth fixed resistor is connected with the output end of the differential amplification circuit, the second end of the fourth fixed resistor is respectively connected with the first end of the capacitor and the first end of the voltage clamping circuit, and the second end of the capacitor is grounded.
Preferably, the differential amplifying circuit is a differential operational amplifier.
The utility model provides a temperature sensing device, at first two bleeder circuit have in this application, differential amplifier can do the difference with two bleeder circuit's sampling voltage, because the electric wire line resistance among two bleeder circuit under the normal condition is more close, consequently can offset the voltage value that the line resistance divides in two bleeder circuit after doing the difference, do the poor result and also the voltage value that the resistance variation volume that thermistor produced along with the temperature value change of target point corresponds, and do not contain the voltage value that the line resistance corresponds, consequently, it is more accurate through the temperature value of calculating after enlargiing it.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required in the prior art and the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a temperature sensing device provided by the present invention;
fig. 2 is a schematic structural diagram of a three-wire thermistor provided by the present invention;
fig. 3 is a schematic structural diagram of another temperature sensing device provided by the present invention;
fig. 4 is a schematic structural diagram of a bridge circuit according to the present invention.
Detailed Description
The core of the utility model is to provide a temperature sensing device, eliminated the line resistance to the influence that the temperature detected, improved the accuracy that the temperature detected.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a temperature sensing device according to the present invention, the temperature sensing device includes:
a voltage stabilizing power supply 1 connected to the first voltage dividing circuit 2 and the second voltage dividing circuit 3, respectively, for simultaneously supplying a voltage of a stable value to the first voltage dividing circuit 2 and the second voltage dividing circuit 3;
a first voltage dividing circuit 2 including a first fixed resistor R9 and a thermistor R0;
a second voltage dividing circuit 3 including a second fixed resistor R6 and a third fixed resistor R7;
and the differential amplifier circuit 4, of which the first input end is connected with the middle point of the first voltage divider circuit 2 and the second input end is connected with the middle point of the second voltage divider circuit 3, is used for differentiating and amplifying the voltage values of the two middle points of the first voltage divider circuit 2 and the second voltage divider circuit 3 so as to calculate the temperature value of the target point where the thermistor R0 is located through the differential amplifier circuit.
In particular, in view of the technical problems in the background art, the embodiment of the present invention provides two voltage dividing circuits, wherein the two voltage dividing circuits can provide one path of sampling voltage, and the sampling voltage provided by the second voltage dividing circuit 3 can be considered as a standard voltage, because the value thereof depends only on the resistance ratio of the second fixed resistor R6 and the third fixed resistor R7, and the resistance ratio of the second fixed resistor R6 and the third fixed resistor R7 is inconvenient, for the first voltage dividing circuit 2, because the thermistor R0 is disposed on the target point, the resistance of the thermistor R0 changes along with the change of the temperature of the target point, so the resistance ratio of the thermistor R0 and the first fixed resistor R9 also changes, and the voltage value of the sampling voltage of the corresponding first voltage dividing circuit 2 also changes.
Specifically, on the basis of the above paragraphs, it should be noted that, in the general case where two voltage dividing circuits are provided, the specification and the length of the wires are similar, and therefore, the wire resistances in the two voltage dividing circuits are substantially equal, so that the sampling voltages of the two voltage dividing circuits are respectively (the voltage obtained by dividing the thermistor R0 and the wire resistance together) and (the voltage obtained by dividing the third fixed resistor R7 and the wire resistance together), the difference between the two sampling voltages obtained by the differential amplifying circuit 4 is equivalent to obtaining the difference between the voltage obtained by dividing the thermistor R0 and the voltage obtained by dividing the third fixed resistor R7, wherein the wire resistance is cancelled out, the obtained result of the difference can actually reflect the actual resistance value of the thermistor R0, the principle is very simple, for example, assuming that the voltage value of the thermistor R0 and the voltage value of the voltage obtained by dividing the third fixed resistor R7 are equal at 0 ℃, in this case, the difference result is zero, and when the difference result is a that is not equal to zero, a is actually a voltage value corresponding to the resistance value variation of the thermistor R0 with respect to the resistance value corresponding to 0 ℃, a voltage value obtained by adding a to the resistance value of the thermistor R0 at 0 ℃ is a voltage value obtained by dividing the current resistance value of the thermistor R0, then the current resistance value of the thermistor R0 can be determined according to the current voltage value of the thermistor R0 and the resistance value of the first fixed resistor R9, and finally the actual temperature value corresponding to the current resistance value can be determined through the correspondence table between the resistance value of the thermistor R0 and the temperature value.
Wherein, do and enlarge the purpose after the poor in order to enlarge the too little analog quantity of numerical value to the treater can carry out recognition processing smoothly, can the final calculation obtain the temperature value, and the magnification can carry out autonomic settlement, the embodiment of the utility model provides a do not limit here.
Specifically, constant voltage power supply 1 can provide the steady voltage value, and the specific size of its magnitude of voltage can independently set for, the embodiment of the utility model provides a do not limit here.
It should be noted that, the first fixed resistor R9, the second fixed resistor R6 and the third fixed resistor R7 can all select the resistors with high precision and low temperature drift to reduce the error caused by the environmental temperature change and the resistance difference of the resistors, for example, the precise resistor with low temperature drift of 5ppm and precision of one per thousand can be selected for use, and the embodiment of the present invention is not limited herein.
The resistance temperature coefficient represents the relative change of the resistance value of the resistor when the temperature changes by 1 degree, and the ratio of the increased value of the conductor resistance to the original resistance when the temperature rises by 1 degree. The unit is ppm/DEG C. Because the resistance values of all the real resistors are not a fixed value, but change along with the change of the temperature, and only the change range is small, the small temperature drift can also cause measurement errors for precise measurement, and for the resistors, the resistors with smaller temperature coefficients are selected, and the errors introduced into the circuit are also smaller. The differential amplifier circuit 4 can also eliminate the measurement error caused by the temperature drift, and the principle is as follows:
assuming that the resistances of the first fixed resistor R9, the thermistor R0, the second fixed resistor R6, and the third fixed resistor R7 in the present application change correspondingly with the change of the temperature when the ambient temperature changes, assuming that the resistances of the first fixed resistor R9 and the second fixed resistor R6 are both 15k, the resistances of the thermistor R0 and the third fixed resistor R7 are both 1k, and the temperature coefficients of the resistors are the same, after the temperature changes, the resistances of the first fixed resistor R9 and the second fixed resistor R6 are both 15.01k, the resistances of the thermistor R0 and the third fixed resistor R7 are both 1.01k, after the voltage values of the two voltage dividing circuits are measured, the voltage values of the first voltage dividing circuit 2 are subtracted through a difference operation: VCC (R0/(R9+ R0)), voltage value of right arm: VCC (R7/(R6+ R7)), VCC is the output voltage value of the regulated power supply, the voltage values on the two voltage division circuits are subtracted, and the error caused by temperature is eliminated.
The utility model provides a temperature sensing device, at first two bleeder circuit have in this application, differential amplifier can do the difference with two bleeder circuit's sampling voltage, because the electric wire line resistance among two bleeder circuit under the normal condition is more close, consequently can offset the voltage value that the line resistance divides in two bleeder circuit after doing the difference, do the poor result also be the voltage value that resistance variation volume that thermistor R0 produced along with the temperature value change of target point corresponds, and do not contain the voltage value that the line resistance corresponds, consequently, through calculating the temperature value more accurate after enlargiing it.
For better explanation of the embodiments of the present invention, please refer to fig. 2 and fig. 4, fig. 2 is a schematic structural diagram of a three-wire thermistor provided by the present invention, and fig. 4 is a schematic structural diagram of a bridge circuit provided by the present invention, based on the above embodiments:
as a preferred embodiment, the thermistor R0 is a three-wire thermistor;
the positive pole of constant voltage power supply 1 is connected with first end of first fixed resistance R9 and the first end of second fixed resistance R6 respectively, and the second end of first fixed resistance R9 is connected with the first end of thermistor R0, and the second end of second fixed resistance R6 is connected with the first end of third fixed resistance R7, and the second end of thermistor R0 is connected with the second end of third fixed resistance R7 and the negative pole of constant voltage power supply 1 respectively.
Specifically, the wire resistances corresponding to the three outgoing wires of the three-wire thermistor are substantially equal, so that the wire resistances in the first voltage division circuit 2 and the second voltage division circuit 3 can be controlled to be balanced by adopting the three-wire thermistor, and the influence of the wire resistances on temperature detection can be eliminated after difference is made.
As can be seen from fig. 4, since the lengths of the wires and the materials provided to the first voltage-dividing circuit 2 and the second voltage-dividing circuit 3 by the three-wire thermistor are the same, the formed wire resistances are substantially the same.
Of course, the thermistor R0 may be of other types besides the three-wire thermistor, and the embodiment of the present invention is not limited herein.
In a preferred embodiment, the first fixed resistor R9 and the second fixed resistor R6 have the same resistance, and the third fixed resistor R7 has the same resistance as the thermistor R0 at the standard temperature.
Specifically, in the case of the above-described scheme, the difference between the two sampled voltage values may be zero at a standard temperature (which may be 0 ℃ for example), and in this case, the ease and speed of calculation may also be improved.
Of course, in addition to the above solutions, the resistances of the first fixed resistor R9, the second fixed resistor R6, the third fixed resistor R7, and the thermistor R0 may also be other specific values, and the embodiment of the present invention is not limited herein.
For better explaining the embodiments of the present invention, please refer to fig. 3, fig. 3 is a schematic structural diagram of another temperature sensing device provided by the present invention, and as a preferred embodiment, the temperature sensing device further includes:
the first end is connected with the output end of the differential amplifying circuit 4, the second end is used for being connected with a voltage clamping circuit 5 of the processor, and the voltage clamping circuit is used for clamping the voltage value output by the differential amplifier within a preset value so as to prevent the processor at the rear end from being damaged.
Specifically, consider that the final voltage value that needs the treater to output to difference amplifier circuit 4 handles, if this voltage value takes place the sudden change because of some reasons, increases a higher voltage value suddenly, then can directly cause the damage of treater, consequently the embodiment of the utility model provides an in the embodiment of the voltage value clamp that will difference amplifier output through voltage clamp circuit 5 is in the default to prevent that it from exceeding the default and causing the damage to the treater, reduced cost of maintenance.
Wherein, the preset value can be set independently, for example can be 3.3V etc., the embodiment of the utility model provides a do not limit here.
As a preferred embodiment, the voltage clamp circuit 5 includes a first diode, a second diode, and a clamp power supply;
the anode of the first diode is grounded, the cathode of the first diode and the anode of the second diode are used as a first end and a second end of the voltage clamping resistor, and the cathode of the second diode is connected with the clamping power supply.
Specifically, the voltage clamp circuit 5 in the embodiment of the present invention includes only two diodes, which has the advantages of simple structure and low cost.
Of course, the voltage clamp circuit 5 may be of various types other than this type, and the embodiment of the present invention is not limited herein.
As a preferred embodiment, the temperature sensing device further includes:
and the low-pass filter 6 is connected with the first end of the differential amplifying circuit 4 and the second end of the differential amplifying circuit 5, and is used for filtering high-frequency interference suffered by electric energy in the circuit.
Specifically, consider that perhaps some high frequency components have been added because of some reasons in the circuit, have caused the interference to the voltage value of difference amplifier circuit 4 output itself, may reduce the accuracy that the temperature detected, consequently the embodiment of the utility model provides an in set up low pass filter 6 and carried out the filtering to the interference of high frequency part to the temperature value that obtains accurate target point can be calculated to the processor.
As a preferred embodiment, the low-pass filter 6 includes a fourth fixed resistor and a capacitor;
the first end of the fourth fixed resistor is connected with the output end of the differential amplifying circuit 4, the second end of the fourth fixed resistor is respectively connected with the first end of the capacitor and the first end of the voltage clamping circuit 5, and the second end of the capacitor is grounded.
Specifically, the embodiment of the present invention provides a low-pass filter 6 with advantages of simple structure, low cost and long service life.
Of course, besides this type, the low-pass filter 6 may be of other types, and the embodiment of the present invention is not limited herein.
As a preferred embodiment, the differential amplifying circuit 4 is a differential operational amplifier.
Specifically, the differential operational amplifier has the advantages of small size, low cost, long service life and the like.
Through practical tests, the phenomenon that a measured value is inaccurate exists when the differential operational amplifier works under the condition of single power supply, and the differential operational amplifier can be powered by double power supplies, wherein negative voltage can be realized by adopting a charge pump.
The differential operational amplifier may be of various types, for example, the differential operational amplifier may be an AD620 in fig. 4, and may also be a model such as an LT1167, which is not limited herein.
Of course, the differential amplifier circuit 4 may be of other types besides the differential operational amplifier, and the embodiment of the present invention is not limited herein.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A temperature sensing device, comprising:
the voltage stabilizing power supply is respectively connected with the first voltage dividing circuit and the second voltage dividing circuit and is used for simultaneously providing voltage with a stable value for the first voltage dividing circuit and the second voltage dividing circuit;
the first voltage division circuit including a first fixed resistor and a thermistor;
the second voltage division circuit including a second fixed resistance and a third fixed resistance;
and the differential amplification circuit is used for differentiating and amplifying the voltage values of the two intermediate points of the first voltage division circuit and the second voltage division circuit so as to calculate the temperature value of the target point where the thermistor is located through the differential amplification circuit.
2. The temperature sensing device of claim 1, wherein the thermistor is a three wire thermistor;
the positive pole of constant voltage power supply respectively with the first end of first fixed resistor and the first end of second fixed resistor is connected, the second end of first fixed resistor with thermistor's first end is connected, the second end of second fixed resistor with the first end of third fixed resistor is connected, thermistor's second end respectively with the second end of third fixed resistor and constant voltage power supply's negative pole is connected.
3. The temperature sensing device according to claim 2, wherein the first fixed resistor and the second fixed resistor have the same resistance, and the third fixed resistor has the same resistance as the thermistor at a standard temperature.
4. The temperature sensing device of claim 3, further comprising:
the first end is connected with the output end of the differential amplification circuit, the second end is used for being connected with a voltage clamping circuit of the processor, and the voltage clamping circuit is used for clamping the voltage value output by the differential amplification circuit within a preset value so as to prevent the processor at the rear end from being damaged.
5. The temperature sensing device of claim 4, wherein the voltage clamp circuit comprises a first diode, a second diode, and a clamp power supply;
the anode of the first diode is grounded, the cathode of the first diode and the anode of the second diode are used as the first end and the second end of the voltage clamping circuit, and the cathode of the second diode is connected with the clamping power supply.
6. The temperature sensing device of claim 4, further comprising:
the low-pass filter is used for filtering high-frequency interference on electric energy in the circuit;
the first terminal of the voltage clamp circuit is connected to the output terminal of the differential amplification circuit through the low pass filter.
7. The temperature sensing device of claim 6, wherein the low pass filter comprises a fourth fixed resistor and a capacitor;
the first end of the fourth fixed resistor is connected with the output end of the differential amplification circuit, the second end of the fourth fixed resistor is respectively connected with the first end of the capacitor and the first end of the voltage clamping circuit, and the second end of the capacitor is grounded.
8. The temperature sensing device according to any one of claims 1 to 7, wherein the differential amplification circuit is a differential operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021907805.1U CN213336542U (en) | 2020-09-03 | 2020-09-03 | Temperature sensing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021907805.1U CN213336542U (en) | 2020-09-03 | 2020-09-03 | Temperature sensing device |
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| CN213336542U true CN213336542U (en) | 2021-06-01 |
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| CN202021907805.1U Active CN213336542U (en) | 2020-09-03 | 2020-09-03 | Temperature sensing device |
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