CN216748569U - Circuit for improving temperature detection precision, temperature detection circuit and air conditioner - Google Patents
Circuit for improving temperature detection precision, temperature detection circuit and air conditioner Download PDFInfo
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- CN216748569U CN216748569U CN202123324320.7U CN202123324320U CN216748569U CN 216748569 U CN216748569 U CN 216748569U CN 202123324320 U CN202123324320 U CN 202123324320U CN 216748569 U CN216748569 U CN 216748569U
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Abstract
The utility model discloses a circuit for improving temperature detection precision, a temperature detection circuit and an air conditioner, wherein the circuit for improving the temperature detection precision comprises: the switch controller is connected with the constant current source of the temperature detection circuit and the control system, is connected with the current provided by the constant current source, and works according to the control signal of the control system; the first resistor and the second resistor are respectively connected with the switch controller and the control system; the switch controller controls the conduction of the first resistor or the second resistor according to a control signal of the control system, changes the current provided by the constant current source, enables the control system to obtain different AD temperature sampling values aiming at the load respectively based on different currents, and corrects the AD temperature sampling values obtained by the control system under the current provided by the constant current source according to the different AD temperature sampling values. In the scheme, the sampling data are calibrated, so that the temperature error caused by environmental interference is reduced, the problem of load misoperation caused by the temperature error is avoided, and the data accuracy is improved.
Description
Technical Field
The utility model relates to the technical field of air conditioner control, in particular to a circuit for improving temperature detection precision, a temperature detection circuit and an air conditioner.
Background
In the existing central air-conditioning control system, the temperature of the motor winding in the air-conditioning unit is detected by a detection circuit composed of a constant current source and an operational amplifier circuit, and corresponding load control is performed according to the detected temperature value, wherein the constant current source can provide a constant current by using a PT100 circuit, for example, and the operational amplifier circuit can amplify the constant current by a corresponding multiple.
Under the normal condition, when the environment does not have the interference, the temperature value that the main chip gathered is exactly the actual load temperature value, but in the practical application scene, except being the actual temperature value of load in the temperature value of gathering, still including the environmental interference in the inside however, sometimes because of receiving the environmental interference in the temperature detect process, make the temperature value of gathering have certain deviation easily, when disturbing great, will influence the temperature value accuracy of being worth, thereby the temperature value that appears gathering is not actual temperature value, finally lead to the load to act because of the temperature value false alarm.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is as follows: the problem of load misoperation caused by inaccurate collected motor winding temperature due to environmental interference in the prior art is solved.
In order to solve the above technical problem, the present invention provides a circuit for improving temperature detection accuracy, including:
the switch controller is connected with a constant current source of the temperature detection circuit and the control system, is accessed with the current provided by the constant current source, and works according to the control signal of the control system;
the first resistor and the second resistor are respectively connected with the switch controller and the control system;
the switch controller controls the conduction of the first resistor or the second resistor according to a control signal of the control system, so that the current provided by the constant current source is changed, the control system obtains different AD temperature sampling values aiming at a load respectively based on different currents, and the AD temperature sampling values obtained by the control system under the current provided by the constant current source are corrected according to the different AD temperature sampling values.
Optionally, the switch controller comprises a single pole double throw switch.
Optionally, a ratio of the second resistance to the first resistance is greater than 1 and not greater than 2.
In order to solve the above technical problem, the present invention provides a temperature detection circuit, including:
the circuit for improving the temperature detection precision;
a constant current source including a temperature sensor, the switch controller being connected to the temperature sensor;
and the control system is connected with the switch controller, the first resistor, the second resistor and the constant current source and is used for obtaining an AD temperature sampling value under the current provided by the constant current source, controlling the conduction of the first resistor or the second resistor so as to change the current provided by the constant current source, further respectively obtaining different AD temperature sampling values aiming at the load based on different currents, and correcting the AD temperature sampling value obtained under the current provided by the constant current source according to the different AD temperature sampling values.
Optionally, the method further comprises:
and the operational amplifier circuit is connected with the constant current source, the control system, the first resistor and the second resistor, is used for amplifying the voltage of the constant current source and the voltage formed when the first resistor or the second resistor is conducted by preset times, and inputs the amplified voltage into the control system so that the control system obtains a corresponding AD temperature sampling value.
Optionally, the temperature detection circuit comprises a temperature detection circuit of an air conditioner, and the load comprises a motor winding of the air conditioner.
In order to solve the above technical problem, the present invention provides an air conditioner, including the above circuit for improving temperature detection accuracy, or including the above temperature detection circuit.
Compared with the prior art, one or more embodiments in the above scheme can have the following advantages or beneficial effects:
the circuit for improving the temperature detection precision, the temperature detection circuit and the air conditioner are applied, the switch controller is connected with the constant current source and the control system of the temperature detection circuit, is connected with the current provided by the constant current source, and works according to the control signal of the control system; the first resistor and the second resistor are respectively connected with the switch controller and the control system; the switch controller controls the conduction of the first resistor or the second resistor according to a control signal of the control system, so that the current provided by the constant current source is changed, the control system obtains different AD temperature sampling values aiming at a load respectively based on different currents, and the AD temperature sampling values obtained by the control system under the current provided by the constant current source are corrected according to the different AD temperature sampling values.
Therefore, the temperature error caused by environmental interference is reduced by calibrating the sampling data, and the problem of load misoperation caused by the temperature error is further avoided; in addition, the current is changed, so that the size of the AD sampling value is changed, the temperature error caused by the environmental interference part can be automatically filtered, the actual temperature sampling accuracy is improved, the environmental interference is reduced compared with the conventional sampling mode, and the data accuracy is improved.
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 the drawings without creative efforts.
FIG. 1 is a schematic diagram of a circuit for improving temperature detection accuracy according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an AD temperature sampling curve provided by an embodiment of the present invention;
fig. 3 is a circuit diagram of a temperature detection circuit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
In order to solve the problem of load misoperation caused by unreal acquired motor winding temperature in the prior art, the embodiment of the utility model provides a circuit for improving temperature detection precision, a temperature detection circuit and an air conditioner.
Example one
As shown in fig. 1, a schematic diagram of a circuit for improving temperature detection accuracy according to an embodiment of the present invention includes:
and the switch controller K is connected with a constant current source of the temperature detection circuit and the control system, is accessed with the current provided by the constant current source, and works according to the control signal of the control system.
In one case, the switch controller K includes a single pole double throw switch.
It should be noted that the constant current source is mainly used for providing a fixed and stable current, and the obtained voltage value is amplified by a preset multiple through the operational amplifier circuit and is sampled by the control system to obtain a corresponding AD temperature sampling value. In one embodiment, the constant current source provides a reference voltage of 2.5V through the TL431 device.
And the first resistor R1 and the second resistor R2 are respectively connected with the switch controller K and the control system.
Preferably, the ratio of the second resistance R2 to the first resistance R1 is greater than 1 and not greater than 2. For example, in one case, the first resistor R1 is 1.25 kilo-ohms and the second resistor R2 is 2.5 kilo-ohms. It should be noted that the second resistor R2 exceeds the first resistor R1, but does not exceed 2 times the resistance of the first resistor R1, and the specific values of R1 and R2 are not limited in the embodiment of the present invention.
The switch controller K controls the conduction of the first resistor R1 or the second resistor R2 according to a control signal of the control system, so that the current provided by the constant current source is changed, the control system obtains different AD temperature sampling values aiming at a load respectively based on different currents, and the AD temperature sampling values obtained by the control system under the current provided by the constant current source are corrected according to the different AD temperature sampling values.
In practical applications, the control system may be a control system including a processor such as a main control chip, and may generate a control signal for controlling the switch controller K to control the conduction of the first resistor R1 or the second resistor R2, so as to change the current provided by the constant current source, obtain different AD temperature sampling values for the load based on different currents, and correct the AD temperature sampling values obtained by the control system under the current provided by the constant current source according to the different AD temperature sampling values.
It should be noted that, when the environment has no interference, the temperature value acquired by the control system is an actual load temperature value, but in an actual application scenario, there will usually be a certain amount of environmental interference, and when the interference is large, the accuracy of the temperature value will be affected. That is, the acquired AD temperature sampling values include temperature sampling values of the environmental disturbance part in addition to the actual temperature value of the load. As shown in fig. 2, the values of a and b are the AD temperature sampling values of the environmental disturbance part.
In some cases, the circuit for detecting the increased temperature may be applied to the temperature detecting circuit shown in fig. 3, and the principle of the circuit for detecting the increased temperature will be described with reference to a specific example.
When the control system outputs a high level, the contact 4 of the switch controller is switched on, the first resistor R1 is switched on, and at this time, the current I1 is calculated to be U/R2.5/1.25K to be 2 mA. Since the resistance value of the temperature sensor PT100 in the constant current source is fixed and is denoted as R, the voltage value of 0.002R can be calculated, and the AD temperature sampling value a1 actually sampled by the control system is obtained by amplifying the corresponding multiple by the operational amplifier circuit, please refer to the curve in fig. 2.
When the control system outputs a low level, the contact 3 of the switch controller is connected, the second resistor R2 is conducted, and at this time, the current I1 is calculated to be U/R2.5/2.5K to be 1 mA. Since the resistance value of the temperature sensor PT100 in the constant current source is fixed and recorded as R, the voltage value 0.001R can be calculated, and the AD temperature sampling value B1 actually sampled by the control system is obtained by amplifying the corresponding multiple by the operational amplifier circuit, see curve (c) in fig. 2.
The difference of the AD temperature sampling values acquired twice is 2 times under the normal condition according to the current, but if the environment has interference, the two are not in a double relation. With this, the temperature value collected by B1 can be amplified by a factor of 2. Although theoretically the AD temperature samples obtained from a1 and 2B1 are the same, in practice, the value obtained by amplifying B1 by a factor of 2 (see curve (r) in fig. 2) amplifies both the actual temperature value and the disturbed AD temperature sample synchronously, and the value of the environmental disturbance part in the value of a1 is not amplified, so B in fig. 2 is 2 a. Therefore, the Δ | a1(± 1% device variation) -2B1(± 1% device variation) | is the interference part in the environment, and therefore, when the AD temperature sampling value of the actual sampling temperature is obtained, the value of Δ is subtracted, and the finally obtained value is the actually required temperature value.
According to the circuit for improving the temperature detection precision, the sampling data are calibrated, so that the temperature error caused by environmental interference is reduced, and the problem of load misoperation caused by the temperature error is further avoided; in addition, the current is changed, so that the size of the AD sampling value is changed, the temperature error caused by the environmental interference part can be automatically filtered, the actual temperature sampling accuracy is improved, the environmental interference is reduced compared with the conventional sampling method, and the data accuracy is improved.
Example two
In order to solve the above technical problem, the present invention provides a temperature detection circuit, including:
the circuit for improving the temperature detection accuracy in the first embodiment;
a constant current source comprising a temperature sensor to which the switch controller K is connected;
and the control system is connected with the switch controller K, the first resistor R1, the second resistor R2 and the constant current source, and is used for obtaining an AD temperature sampling value under the current provided by the constant current source, controlling the conduction of the first resistor R1 or the second resistor R2 so as to change the current provided by the constant current source, further obtaining different AD temperature sampling values aiming at the load respectively based on different currents, and correcting the AD temperature sampling value obtained under the current provided by the constant current source according to the different AD temperature sampling values.
In one case, the method further comprises: and the operational amplifier circuit is connected with the constant current source, the control system, the first resistor R1 and the second resistor R2, and is used for amplifying the voltage of the constant current source and the voltage formed when the first resistor R1 or the second resistor R2 are conducted by preset times and inputting the amplified voltage into the control system so that the control system obtains a corresponding AD temperature sampling value.
In some cases, the temperature detection circuit of the present embodiment may be implemented as the circuit shown in fig. 3, the constant current source provides a reference voltage of 2.5V, the temperature sensor may be PT100, the switch controller K employs a single-pole double-throw switch, and the control system may be a control system including a processor such as a main control chip.
Optionally, the temperature detection circuit comprises a temperature detection circuit of an air conditioner, and the load comprises a motor winding of the air conditioner. The method comprises the steps that one of a first resistor and a second resistor is connected, the other resistor is disconnected, the current provided by a constant current source is changed, the AD temperature sampling values corresponding to the two resistors under the condition that the two resistors are connected respectively are obtained, and the AD temperature sampling value of the motor winding of the air conditioner is corrected by determining an environmental interference value based on the two AD temperature sampling values.
According to the temperature detection circuit provided by the utility model, the temperature error caused by environmental interference is reduced by calibrating the sampling data, so that the problem of load misoperation caused by the temperature error is avoided; in addition, the current is changed, so that the size of the AD sampling value is changed, the temperature error caused by the environmental interference part can be automatically filtered, the actual temperature sampling accuracy is improved, the environmental interference is reduced compared with the conventional sampling method, and the data accuracy is improved.
EXAMPLE III
In order to solve the above technical problem, the present invention provides an air conditioner, including the circuit for improving the temperature detection accuracy as described in the first embodiment, or including the temperature detection circuit as described in the second embodiment.
According to the air conditioner provided by the utility model, the circuit for improving the temperature detection precision or the temperature detection circuit can be used for calibrating the sampling data, so that the temperature error caused by environmental interference is reduced, and the problem of load misoperation caused by the temperature error is further avoided; in addition, the current is changed, so that the size of the AD sampling value is changed, the temperature error caused by the environmental interference part can be automatically filtered, the actual temperature sampling accuracy is improved, the environmental interference is reduced compared with the conventional sampling method, and the data accuracy is improved.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
It is noted that, herein, relational terms such as first and second, and the like may be 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.
It is to be understood that the terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification of the present application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should also be understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
As used in this specification and the appended claims, the term "if" may be interpreted contextually as "when", "upon" or "in response to a determination" or "in response to a detection". Similarly, the phrase "if it is determined" or "if a described condition or event is detected" may be interpreted, depending on the context, to mean "upon determining" or "in response to determining" or "upon detecting a described condition or event" or "in response to detecting a described condition or event".
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (7)
1. A circuit for improving accuracy of temperature detection, comprising:
the switch controller is connected with a constant current source of the temperature detection circuit and the control system, is accessed with the current provided by the constant current source, and works according to the control signal of the control system;
the first resistor and the second resistor are respectively connected with the switch controller and the control system;
the switch controller controls the conduction of the first resistor or the second resistor according to a control signal of the control system, so that the current provided by the constant current source is changed, the control system obtains different AD temperature sampling values aiming at a load respectively based on different currents, and the AD temperature sampling values obtained by the control system under the current provided by the constant current source are corrected according to the different AD temperature sampling values.
2. The circuit for improving temperature detection accuracy of claim 1, wherein the switch controller comprises a single pole double throw switch.
3. The circuit for improving temperature detection accuracy according to claim 1, wherein a ratio of the second resistance to the first resistance is greater than 1 and not greater than 2.
4. A temperature sensing circuit, comprising:
a circuit for improving accuracy of temperature detection according to any one of claims 1 to 3;
a constant current source including a temperature sensor, the switch controller being connected to the temperature sensor;
a control system connected to the switch controller, the first resistor, the second resistor, and the constant current source, and configured to:
obtaining an AD temperature sampling value under the current provided by the constant current source; and
and controlling the conduction of the first resistor or the second resistor so as to change the current provided by the constant current source, further obtaining different AD temperature sampling values aiming at the load respectively based on different currents, and correcting the AD temperature sampling values obtained under the current provided by the constant current source according to the different AD temperature sampling values.
5. The temperature sensing circuit of claim 4, further comprising:
and the operational amplifier circuit is connected with the constant current source, the control system, the first resistor and the second resistor, is used for amplifying the voltage of the constant current source and the voltage formed when the first resistor or the second resistor is conducted by preset times, and inputs the amplified voltage into the control system so that the control system obtains a corresponding AD temperature sampling value.
6. The temperature detection circuit according to claim 4 or 5, wherein the temperature detection circuit comprises a temperature detection circuit of an air conditioner, and the load comprises a motor winding of the air conditioner.
7. An air conditioner characterized by comprising a circuit for improving temperature detection accuracy according to any one of claims 1 to 3 or comprising a temperature detection circuit according to any one of claims 4 to 6.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123324320.7U CN216748569U (en) | 2021-12-24 | 2021-12-24 | Circuit for improving temperature detection precision, temperature detection circuit and air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123324320.7U CN216748569U (en) | 2021-12-24 | 2021-12-24 | Circuit for improving temperature detection precision, temperature detection circuit and air conditioner |
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| CN216748569U true CN216748569U (en) | 2022-06-14 |
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| CN202123324320.7U Active CN216748569U (en) | 2021-12-24 | 2021-12-24 | Circuit for improving temperature detection precision, temperature detection circuit and air conditioner |
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