CN209841231U - Temperature detection circuit - Google Patents
Temperature detection circuit Download PDFInfo
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- CN209841231U CN209841231U CN201920923053.9U CN201920923053U CN209841231U CN 209841231 U CN209841231 U CN 209841231U CN 201920923053 U CN201920923053 U CN 201920923053U CN 209841231 U CN209841231 U CN 209841231U
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Abstract
The application provides a temperature detection circuit, includes: one end of the thermistor is connected with a power supply; one end of the first voltage division circuit is connected with the other end of the thermistor, and the other end of the first voltage division circuit is grounded; the second voltage division circuit is connected with the first voltage division circuit in parallel, and is connected with a control switch which is used for controlling the on-off of the second voltage division circuit; the main control chip comprises a sampling end and an output end, the sampling end is connected with the other end of the thermistor, and the output end is connected with the control end of the control switch; the main control chip is used for determining the temperature value detected by the thermistor according to the signal collected by the sampling end, so that the temperature detection range is enlarged, and the temperature detection precision is improved.
Description
Technical Field
The application relates to the field of circuits, in particular to a temperature detection circuit.
Background
In the prior art, a thermistor and a divider resistor are generally connected in series to detect temperature, the resistance value of the thermistor is reversely calculated by detecting the voltage value on the thermistor or the divider resistor, and then the temperature of the thermistor is determined according to the corresponding relationship between the resistance value of the thermistor and the temperature.
Therefore, it is an urgent problem to be solved in the art to expand the temperature detection range while ensuring the temperature detection accuracy.
SUMMERY OF THE UTILITY MODEL
The application provides a temperature detection circuit for enlarge temperature detection range under the condition of guaranteeing temperature detection precision.
In order to solve the above-mentioned problems, as an aspect of the present application, there is provided a temperature detection circuit including:
one end of the thermistor is connected with a power supply;
one end of the first voltage division circuit is connected with the other end of the thermistor, and the other end of the first voltage division circuit is grounded;
the second voltage division circuit is connected with the first voltage division circuit in parallel, and is connected with a control switch which is used for controlling the on-off of the second voltage division circuit;
the main control chip comprises a sampling end and an output end, the sampling end is connected with the other end of the thermistor, and the output end is connected with the control end of the control switch; the main control chip is used for determining the temperature value detected by the thermistor according to the signal collected by the sampling end and controlling the on-off of the second voltage division circuit according to the temperature value.
Optionally, the first voltage dividing circuit includes a first resistor, one end of the first resistor is connected to the other end of the thermistor, and the other end of the first resistor is grounded.
Optionally, the first voltage dividing circuit further includes: at least one first coupling capacitor;
one end of the first coupling capacitor is connected with the other end of the thermistor, and the other end of the first coupling capacitor is grounded.
Optionally, the method further includes: at least one second coupling capacitor;
one end of the second coupling capacitor is connected with the power supply, and the other end of the second coupling capacitor is grounded.
Optionally, a second resistor is connected between the sampling end and the other end of the thermistor.
Optionally, the method includes: and one end of the third resistor is connected between the second resistor and the sampling end, and the other end of the third resistor is grounded.
Optionally, the method further includes:
and the voltage follower is connected between the second resistor and the other end of the thermistor, the in-phase end of the voltage follower is connected with the other end of the thermistor, the output end of the voltage follower is connected with the second resistor, and the out-phase end of the voltage follower is connected with the output end of the voltage follower.
Optionally, the second voltage dividing circuit includes: a fourth resistor;
one end of the fourth resistor is connected with the other end of the thermistor, the other end of the fourth resistor is connected with the first end of the control switch, and the second end of the control switch is grounded;
or the first end of the control switch is connected with the other end of the thermistor, the second end of the control switch is connected with one end of the fourth resistor, and the other end of the fourth resistor is grounded.
Optionally, a fifth resistor is connected between the output end and the control end of the control switch.
Optionally, the control switch is a triode, an MOS transistor or a relay.
The application provides a temperature detection circuit, the second divider circuit is connected or cut off when thermistor's resistance and first divider circuit's equivalent resistance differ greatly for parallelly connected first divider circuit and second divider circuit's total resistance is close with thermistor's resistance, after thermistor's resistance changes like this, the voltage value that the sampling end gathered can take place obvious change, thereby temperature detection range has been increased, temperature detection precision has been improved, the interference killing feature has been improved through the voltage follower.
Drawings
Fig. 1 is a composition diagram of a temperature detection circuit in an embodiment of the present application.
Reference numbers in the figures: 1. a thermistor; 2. a first voltage dividing circuit; 21. a first resistor; 22. a first coupling capacitor; 3. a second voltage dividing circuit; 31. a control switch; 32. a fourth resistor; 4. a main control chip; 41. a sampling end; 42. an output end; 5. a second coupling capacitor; 6. a second resistor; 7. a third resistor; 8. a voltage follower; 9. a fifth resistor; and a third coupling capacitor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the prior art, the resistance of thermistor surpasses the recommended resistance range, and when the resistance of thermistor was too big or undersize, the influence of thermistor's resistance change to circuit partial pressure obviously reduced, leads to the temperature detection precision to reduce by a wide margin, in order to solve above-mentioned problem, the application provides a temperature detection circuit, as shown in fig. 1, temperature detection circuit includes: the thermistor comprises a thermistor 1, wherein one end of the thermistor 1 is connected with a power supply; the resistance of the thermistor 1 changes with the temperature, and in the present application, the resistance of the thermistor 1 may increase with the temperature, or may decrease with the temperature. A first voltage dividing circuit 2, one end of the first voltage dividing circuit 2 is connected with the other end of the thermistor 1, and the other end of the first voltage dividing circuit 2 is grounded; the first voltage divider circuit 2 is used to divide the voltage of the thermistor 1, and if the first voltage divider circuit is not provided, the resistance of the thermistor 1 is constant as the voltage of the power supply, where the power supply can be a constant voltage power supply.
The second voltage division circuit 3 is connected in parallel with the first voltage division circuit 2, a control switch 31 is connected to the second voltage division circuit 3, and the control switch 31 is used for controlling the on-off of the second voltage division circuit 3; that is, the second voltage dividing circuit 3 is connected or disconnected according to specific needs, and the second voltage dividing circuit is connected in parallel with the first voltage dividing circuit, so that the total resistance value of the first voltage dividing circuit and the second voltage dividing circuit is reduced when the first voltage dividing circuit and the second voltage dividing circuit are connected, and the voltage division on the thermistor is increased.
The main control chip 4 comprises a sampling end 41 and an output end 42, the sampling end 41 is connected with the other end of the thermistor 1, and the output end 42 is connected with the control end of the control switch 31; the main control chip 4 is configured to determine a temperature value detected by the thermistor 1 according to a signal collected by the sampling terminal 41, and control the on/off of the second voltage division circuit 3 according to the temperature value. Specifically, the left sampling terminal 41 and the right sampling terminal 41 in fig. 1 are the same port.
Specifically, the sampling terminal 41 and the output terminal 42 are I/O ports on the main control chip 4, the signal collected by the sampling terminal 41 is a voltage value obtained by subtracting the voltage division of the thermistor from the power voltage, that is, the potential of the other end of the thermistor 1 with respect to the ground, the voltage value collected by the sampling terminal changes with the temperature, taking the thermistor 1 as a resistor whose resistance value decreases with the temperature increase as an example, a temperature threshold is preset, the voltage value collected by the sampling terminal under the temperature threshold is a voltage threshold, if the upper limit of the detected temperature of the thermistor 1 needs to be increased, the second voltage division circuit 3 is normally kept disconnected, only the first voltage division circuit 2 works, and at this time, the voltage U collected by the sampling terminal is equal to (V) U (VCC/(R1+R6))*R1In which V isccIs the supply voltage, R1Is the equivalent resistance, R, of the first voltage divider circuit6For the resistance value of the thermistor 1, when the voltage value acquired by the sampling end is smaller than the voltage threshold, the second voltage division circuit is kept disconnected, and when the voltage value acquired by the sampling end 41 is larger than the voltage threshold, it is indicated that the resistance value of the thermistor 1 is already low, and at this time, the influence of the resistance value change of the thermistor 1 on the voltage value acquired by the sampling end 41 is small, so that the sensitivity is reduced, therefore, the main control chip 4 outputs a control signal to the control switch 31 through the output end 42, so that the second voltage division circuit 3 is connected, at this time, the first voltage division circuit 2 and the second voltage division circuit 3 are connected in parallel, so that the resistance value of the thermistor 1 is relatively lowerThe ratio of the total resistance of the circuit is increased, and the voltage U detected by the sampling terminal 31 is equal to VCC*(R1*R4/(R1+R4))/(R6+(R1*R4/(R1+R4) In which R) is present in the formula (I))4The equivalent resistance of the second voltage division circuit is reduced after the first voltage division circuit 2 and the second voltage division circuit 3 are connected in parallel, so that the resistance value change of the thermistor 1 can cause obvious change of a sampling end, and the detection range of the temperature detection circuit is expanded under the condition that the detection precision is not reduced and the setting is improved. Preferably, the equivalent resistance of the second voltage divider circuit is equal to or differs by less than 10% from the resistance of the thermistor at the temperature threshold. By adding the second voltage division circuit 3, the detection range of the thermistor is different under the condition that the second voltage division circuit 3 is connected and disconnected, so that the detection range of the thermistor is expanded.
When the resistance of the thermistor 1 increases with the increase of the temperature, the opposite is true, and if the temperature detection upper line of the thermistor 1 is to be increased, the first voltage division circuit 2 and the second voltage division circuit 3 are connected in parallel during normal use, and when the voltage collected by the sampling end 41 is smaller than the voltage threshold value, the resistance value of the thermistor 1 is over-large, and the second voltage division circuit 3 is controlled to be disconnected. At this time, the equivalent resistance value of the first voltage division circuit is preferably equal to or has a difference of less than 10% with the resistance value of the thermistor at the temperature threshold, so that the voltage value detected by the sampling end of the thermistor along with the temperature change is increased, and the temperature detection precision is obviously improved.
According to the technical scheme, the second voltage division circuit is connected or disconnected when the difference between the resistance value of the thermistor 1 and the equivalent resistance value of the first voltage division circuit is large, so that the total resistance value of the first voltage division circuit and the second voltage division circuit which are connected in parallel is close to the resistance value of the thermistor, and the voltage value collected by the sampling end can be obviously changed after the resistance value of the thermistor is changed, so that the temperature detection range is enlarged, and the temperature detection precision is improved.
In some optional embodiments, the first voltage dividing circuit 2 includes a first resistor 21, and one end of the first resistor 21 is connected to the heat-sensitive elementThe other end of the resistor 1 is connected, and the other end of the first resistor 21 is grounded. Specifically, the first resistor 21 functions as a voltage divider for supplying the power source (V in the figure) together with the thermistorcc) Optionally, the first resistor 21 may be a variable resistor, so that the detection range and voltage value of the temperature detection circuit may be expanded.
In some optional embodiments, referring to fig. 1, the first voltage dividing circuit 2 further includes: at least one first coupling capacitor 22; one end of the first coupling capacitor 22 is connected to the other end of the thermistor 1, and the other end of the first coupling capacitor 22 is grounded. As shown in fig. 1, two first coupling capacitors 22 may be connected in parallel with each other and the first resistor 21, the first coupling capacitors 22 are used for filtering and rectifying, the capacitors are connected with ac resistor dc, and the capacitors are charged at the peak of rectification and discharged at the trough of rectification to play the role of peak load and valley load. The parallel coupling capacitor has the function of improving the capacitance value of the parallel capacitor.
In some optional embodiments, further comprising: at least one second coupling capacitor 5; one end of the second coupling capacitor 5 is connected with the power supply, and the other end of the second coupling capacitor 5 is grounded. The second coupling capacitor 5 functions as rectification and filtering.
In some optional embodiments, a second resistor 6 is connected between the sampling end 41 and the other end of the thermistor 1. The second resistor 6 is used for limiting current and preventing the sampling terminal 41 from being burnt due to overlarge current.
In some optional embodiments, further comprising: and one end of the third resistor 7 is connected between the second resistor 6 and the sampling end 41, and the other end of the third resistor 7 is grounded. At this time, the second resistor 6 and the third resistor 7 will affect the voltage collected by the sampling terminal, the voltage value collected by the sampling terminal is the voltage value obtained by dividing the potential of the other end of the thermistor 1 by the second resistor 6 and the third resistor 7, and if the potential of the other end of the thermistor 1 is V, the voltage collected by the sampling terminal 41 at this time is V R2/(R2+R3) Wherein R is2Is the resistance value, R, of the third resistor 73The resistance of the second resistor 6, that is, when the second voltage dividing circuit is disconnected by the control switch 31, the voltage at the sampling terminal 41 is "U ═ VCC/(R1+R6))*R1]*[R2/(R2+R3)]In which V isccIs the supply voltage, R1Is the equivalent resistance, R, of the first voltage divider circuit6Is the resistance of the thermistor. When the control switch 31 connects the second voltage dividing circuit, U ═ VCC/(R6+(R1*R4/(R1+R4)))*(R1*R4/(R1+R4))]*[R2/(R2+R3)]Wherein R is4Is the equivalent resistance of the second voltage divider circuit. The third resistor 7 has the function that the detectable voltage ranges of different main control chips 4 are different, the voltage value collected by the sampling end is adjusted through resistor voltage division, so that the voltage value meets the normal sampling working condition of the main control chip 4, and the third resistor 7 preferably adopts an adjustable resistor. Optionally, the third resistor 7 may be connected in parallel with the third coupling capacitor 10 for filtering and rectifying.
In some optional embodiments, further comprising: and the voltage follower 8 is connected between the second resistor 6 and the other end of the thermistor 1, the in-phase end of the voltage follower 8 is connected with the other end of the thermistor 1, the output end of the voltage follower 8 is connected with the second resistor 6, and the out-of-phase end of the voltage follower 8 is connected with the output end of the voltage follower 8.
Specifically, the voltage follower 8 is prepared by an operational amplifier, and according to the property of the operational amplifier, the voltage of the in-phase end is used for being equal to the voltage of the inverting end, because the inverting end is connected with the output end, the voltage of the inverting end is the same as that of the output end, namely, the voltage of the in-phase end is the same as that of the output end, but an interference signal in a signal input by the in-phase end can be greatly reduced after passing through the operational amplifier, so that the anti-interference capability of the temperature detection circuit can be improved, thereby the transmission distance of a voltage signal is increased, and the voltage value acquired by the sampling end is prevented from obviously deviating due to the attenuation of the voltage signal.
In some optional embodiments, the second voltage division circuit 3 includes: a fourth resistor 32;
one end of the fourth resistor 32 is connected to the other end of the thermistor 1, the other end of the fourth resistor 32 is connected to the first end of the control switch 31, and the second end of the control switch 31 is grounded;
or, a first end of the control switch 31 is connected to the other end of the thermistor 1, a second end of the control switch 31 is connected to one end of the fourth resistor 32, and the other end of the fourth resistor 32 is grounded.
In some alternative embodiments, a fifth resistor 9 is connected between the output end 42 and the control end of the control switch 31. The fifth resistor 9 is used for limiting current and preventing the current from being overlarge.
Optionally, the control switch 31 is a triode, a MOS transistor, or a relay. Taking the control switch 31 as a triode as an example, specifically taking the triode as an NPN type as an example, the base of the triode is connected with the output end 42 of the main control chip 4, the collector is connected with the fourth resistor 32, and the emitter is grounded, when the second voltage division circuit 3 needs to be controlled to be connected, the control current is output through the main control chip 4, so that the collector and the emitter of the triode are conducted, the second voltage division circuit 3 is connected with the first voltage division circuit 2 in parallel to reduce the total resistance, the value of the voltage acquired by the sampling end is changed, and thus the detection temperature range of the temperature detection circuit can be improved and the detection precision can be improved.
This application still provides a evaporate roast all-in-one, including the temperature detection circuit that this application provided, under the steaming mould, thermistor need detect near 100 degrees centigrade temperature variation more accurately, and under the barbecue mode, thermistor need more accurate detection >200 ℃ temperature variation, can reach more accurate detection under the different temperature circumstances through selecting to open control switch 31. Assuming that the resistance of the thermistor decreases with the increase of temperature, a temperature threshold is set, and the temperature threshold corresponds to the resistance threshold of the thermistor, the equivalent resistance of the first voltage divider circuit can be set to be 5 times to 7 times of the resistance threshold, and the equivalent resistance of the second voltage divider circuit can be set to be 100% -50% of the resistance threshold.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A temperature sensing circuit, comprising:
the thermistor comprises a thermistor (1), wherein one end of the thermistor (1) is connected with a power supply;
a first voltage dividing circuit (2), wherein one end of the first voltage dividing circuit (2) is connected with the other end of the thermistor (1), and the other end of the first voltage dividing circuit (2) is grounded;
the second voltage division circuit (3) is connected with the first voltage division circuit (2) in parallel, a control switch (31) is connected to the second voltage division circuit (3), and the control switch (31) is used for controlling the on-off of the second voltage division circuit (3);
the main control chip (4) comprises a sampling end (41) and an output end (42), the sampling end (41) is connected with the other end of the thermistor (1), and the output end (42) is connected with the control end of the control switch (31); the main control chip (4) is used for determining a temperature value detected by the thermistor (1) according to a signal collected by the sampling end (41), and controlling the on-off of the second voltage division circuit (3) according to the temperature value.
2. The temperature detection circuit according to claim 1, wherein the first voltage division circuit (2) includes a first resistor (21), one end of the first resistor (21) is connected to the other end of the thermistor (1), and the other end of the first resistor (21) is grounded.
3. The temperature detection circuit according to claim 1 or 2, wherein the first voltage division circuit (2) further comprises: at least one first coupling capacitance (22);
one end of the first coupling capacitor (22) is connected with the other end of the thermistor (1), and the other end of the first coupling capacitor (22) is grounded.
4. The temperature sensing circuit of claim 1, further comprising: at least one second coupling capacitance (5);
one end of the second coupling capacitor (5) is connected with the power supply, and the other end of the second coupling capacitor (5) is grounded.
5. The temperature detection circuit according to claim 1,
and a second resistor (6) is connected between the sampling end (41) and the other end of the thermistor (1).
6. The temperature sensing circuit of claim 5, further comprising:
and one end of the third resistor (7) is connected between the second resistor (6) and the sampling end (41), and the other end of the third resistor (7) is grounded.
7. The temperature detection circuit according to claim 5 or 6, further comprising:
the voltage follower (8) is connected between the second resistor (6) and the other end of the thermistor (1), the in-phase end of the voltage follower (8) is connected with the other end of the thermistor (1), the output end of the voltage follower (8) is connected with the second resistor (6), and the out-phase end of the voltage follower (8) is connected with the output end of the voltage follower (8).
8. The temperature detection circuit according to claim 1, wherein the second voltage division circuit (3) comprises: a fourth resistor (32);
one end of the fourth resistor (32) is connected with the other end of the thermistor (1), the other end of the fourth resistor (32) is connected with the first end of the control switch (31), and the second end of the control switch (31) is grounded;
or the first end of the control switch (31) is connected with the other end of the thermistor (1), the second end of the control switch (31) is connected with one end of the fourth resistor (32), and the other end of the fourth resistor (32) is grounded.
9. The temperature detection circuit according to claim 1,
and a fifth resistor (9) is connected between the output end (42) and the control end of the control switch (31).
10. The temperature sensing circuit of any of claims 1-2, 4-6, or 8-9, wherein the control switch is a transistor, a MOS transistor, or a relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920923053.9U CN209841231U (en) | 2019-06-18 | 2019-06-18 | Temperature detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920923053.9U CN209841231U (en) | 2019-06-18 | 2019-06-18 | Temperature detection circuit |
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| CN209841231U true CN209841231U (en) | 2019-12-24 |
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| CN201920923053.9U Active CN209841231U (en) | 2019-06-18 | 2019-06-18 | Temperature detection circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112729587A (en) * | 2020-12-15 | 2021-04-30 | 珠海格力电器股份有限公司 | Temperature detection circuit, refrigerator and temperature detection method |
| CN113220049A (en) * | 2021-07-08 | 2021-08-06 | 国开启科量子技术(北京)有限公司 | Segmented temperature control device for single-photon detector and quantum communication equipment |
-
2019
- 2019-06-18 CN CN201920923053.9U patent/CN209841231U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112729587A (en) * | 2020-12-15 | 2021-04-30 | 珠海格力电器股份有限公司 | Temperature detection circuit, refrigerator and temperature detection method |
| CN113220049A (en) * | 2021-07-08 | 2021-08-06 | 国开启科量子技术(北京)有限公司 | Segmented temperature control device for single-photon detector and quantum communication equipment |
| CN113220049B (en) * | 2021-07-08 | 2021-10-08 | 国开启科量子技术(北京)有限公司 | Segmented temperature control device for single-photon detector and quantum communication equipment |
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