CN112504499A - Temperature detection circuit, control method and gas stove - Google Patents
Temperature detection circuit, control method and gas stove Download PDFInfo
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- CN112504499A CN112504499A CN202011383546.1A CN202011383546A CN112504499A CN 112504499 A CN112504499 A CN 112504499A CN 202011383546 A CN202011383546 A CN 202011383546A CN 112504499 A CN112504499 A CN 112504499A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C3/00—Stoves or ranges for gaseous fuels
- F24C3/12—Arrangement or mounting of control or safety devices
- F24C3/126—Arrangement or mounting of control or safety devices on ranges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
- G01K15/005—Calibration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
- G01K7/24—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor in a specially-adapted circuit, e.g. bridge circuit
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- Nonlinear Science (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention discloses a temperature detection circuit, a control method and a gas stove, comprising the following steps: a thermistor; the voltage division adjusting unit is connected with the thermistor to form a voltage division circuit; the processing module is connected with the voltage division circuit to acquire a voltage division detection signal, and the processing module is connected with the control end of the voltage division adjusting unit to adjust the resistance value of the voltage division adjusting unit according to the voltage division detection signal. The thermistor and the voltage division adjusting unit form a voltage division circuit, the processing module acquires a voltage division detection signal output by the voltage division circuit, and when the voltage division detection signal exceeds a preset threshold value, namely the thermistor is in a high-temperature state, the processing module controls the voltage division adjusting unit to adjust the resistance value, so that the voltage difference between the thermistor and the voltage division adjusting unit is reduced, and even if the resistance value of the thermistor changes slightly, the voltage value or the current value of the voltage division detection signal can be obviously changed, and the effect of improving the detection accuracy is achieved.
Description
Technical Field
The invention relates to the field of temperature detection circuits, in particular to a temperature detection circuit, a control method and a gas stove.
Background
At present, a temperature detection circuit is generally arranged on equipment such as a gas stove and the like to detect the temperature during heating, so that the dry burning condition is avoided, and the safety is improved. In the prior art, a temperature detection circuit generally adopts a thermistor as a temperature measuring device.
However, since the temperature difference between the normal temperature state and the heated high temperature state is large, the resistance of the thermistor also changes greatly, for example, the resistance of the thermistor is about 200k ohm to 310k ohm when the normal temperature state is about 25 ℃, and the resistance of the thermistor is changed to dozens of ohm to hundreds of ohm when the high temperature state is about 220 ℃ to 300 ℃, and the resistance of the thermistor changes little when the temperature changes under the high temperature state, so that the change of the detection voltage or current is also small, and the accurate value of the temperature change is not easy to know, i.e. the detection precision is low.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a temperature detection circuit which can improve the accuracy of temperature detection when the thermistor is in a high-temperature state.
The invention also provides a control method which can improve the temperature detection accuracy of the thermistor in a high-temperature state.
The invention also provides the gas stove, which can accurately detect the temperature value during combustion.
A temperature detection circuit according to an embodiment of a first aspect of the present invention includes: a thermistor; the voltage division adjusting unit is connected with the thermistor to form a voltage division circuit; the processing module is connected with the voltage division circuit to acquire a voltage division detection signal, and the processing module is connected with the control end of the voltage division adjusting unit to adjust the resistance value of the voltage division adjusting unit according to the voltage division detection signal.
The temperature detection circuit according to the embodiment of the invention has at least the following beneficial effects: the thermistor and the voltage division adjusting unit form a voltage division circuit, the processing module acquires a voltage division detection signal output by the voltage division circuit, and when the voltage division detection signal exceeds a preset threshold value, namely the thermistor is in a high-temperature state, the processing module controls the voltage division adjusting unit to adjust the resistance value, so that the voltage difference between the thermistor and the voltage division adjusting unit is reduced, and even if the resistance value of the thermistor changes slightly, the voltage value or the current value of the voltage division detection signal can be obviously changed, and the effect of improving the detection accuracy is achieved.
According to some embodiments of the present invention, the processing module includes a temperature calculating unit and a control unit, the temperature calculating unit is respectively connected to the voltage dividing circuit and the control unit, and the control unit is connected to a control end of the voltage dividing adjusting unit.
According to some embodiments of the present invention, the voltage dividing and adjusting unit includes at least two voltage dividing members, one end of each of the voltage dividing members is connected to the thermistor and the temperature calculating unit, respectively, and the other end of at least one of the voltage dividing members is connected to the control unit.
According to some embodiments of the present invention, the voltage division adjusting unit includes two voltage division parts, the two voltage division parts are a resistor R1 and a resistor R2, the thermistor is connected to the temperature calculating unit, one end of the resistor R1 and one end of the resistor R2, the other end of the resistor R1 is connected to the control unit, and the other end of the resistor R2 is connected to ground.
According to some embodiments of the present invention, the control unit is provided with a push-pull unit, and the control unit is connected to the other end of the pressure-dividing member through the push-pull unit.
According to some embodiments of the invention, the temperature calculating unit is connected to the voltage dividing circuit through the filter unit.
According to some embodiments of the present invention, the filtering unit includes a resistor R3 and a capacitor C1, one end of the resistor R3 is connected to the thermistor and the voltage division adjusting unit, respectively, the other end of the resistor R3 is connected to the temperature calculating unit and one end of the capacitor C1, respectively, and the other end of the capacitor C1 is grounded.
According to a control method of an embodiment of a second aspect of the invention: the processing module acquires a voltage division detection signal of the voltage division circuit; when the voltage division detection signal exceeds a preset threshold value, the processing module controls the voltage division adjusting unit to adjust the resistance value so as to reduce the voltage difference between the thermistor and the voltage division adjusting unit.
The control method provided by the embodiment of the invention has at least the following beneficial effects: when the divided voltage detection signal gradually increases or gradually decreases to exceed a preset threshold value, namely the thermistor is in a high-temperature state, the processing module controls the divided voltage adjusting unit to adjust the resistance value, so that the difference value between the divided voltage value of the thermistor and the divided voltage value of the divided voltage adjusting unit is reduced, namely, the voltage difference is reduced, further, the resistance value change of the thermistor can also enable the detection voltage value and the detection current value to obviously change in the high-temperature state, and the improvement of the accuracy of temperature detection in the high-temperature state is facilitated.
According to some embodiments of the invention, after the divided voltage detection signal exceeds the preset threshold, the processing module periodically controls the divided voltage adjusting unit to adjust the magnitude of the resistance value according to a preset time.
According to a third aspect embodiment of the present invention, a gas range includes: the temperature detection circuit is arranged on the stove body.
The gas stove provided by the embodiment of the invention at least has the following beneficial effects: be provided with foretell temperature-detecting circuit on the kitchen body, temperature when thermistor can detect the external container of kitchen body heating, through when the heating, under the high temperature state promptly, the size of processing module control partial pressure regulating unit regulation resistance value, and then improve the degree of accuracy that the temperature detected, be favorable to detecting the container temperature when heating more accurately, avoid appearing the condition such as dry combustion method, prevent unexpected emergence, improve the security.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a circuit diagram of one embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, if there are first and second described only for the purpose of distinguishing technical features, it is not understood that relative importance is indicated or implied or that the number of indicated technical features or the precedence of the indicated technical features is implicitly indicated or implied.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
As shown in fig. 1, a temperature detection circuit according to an embodiment of the present invention includes: a thermistor 100; a voltage division adjusting unit 200, wherein the voltage division adjusting unit 200 is connected with the thermistor 100 to form a voltage division circuit; the processing module 300, the processing module 300 is connected to the voltage divider circuit to obtain the divided voltage detection signal, and the processing module 300 is connected to the control terminal of the divided voltage adjusting unit 200 to adjust the resistance value of the divided voltage adjusting unit 200 according to the divided voltage detection signal.
The thermistor 100 and the voltage division adjusting unit 200 form a voltage division circuit, the processing module 300 obtains a voltage division detection signal output by the voltage division circuit, when the voltage division detection signal exceeds a preset threshold value, that is, the thermistor 100 is in a high-temperature state, the processing module 300 controls the voltage division adjusting unit 200 to adjust the resistance value, the voltage difference between the thermistor 100 and the voltage division adjusting unit 200 is reduced, and even if the resistance value of the thermistor 100 changes slightly, the voltage value or the current value of the voltage division detection signal can also change obviously, so that the effect of improving the detection accuracy is achieved.
Referring to fig. 1, in some embodiments of the present invention, the processing module 300 includes a temperature calculating unit 310 and a control unit 320, the temperature calculating unit 310 is connected to the voltage dividing circuit and the control unit 320, respectively, and the control unit is connected to the control terminal of the voltage dividing and adjusting unit 200.
The temperature calculating unit 310 calculates a corresponding temperature value according to the acquired voltage division detection signal, and when the temperature value exceeds a preset threshold, a trigger signal is sent to the control unit 320, so that the control unit 320 controls the voltage division adjusting unit 200 to adjust the resistance value, and the control unit 320 generates a feedback signal to the temperature calculating unit 310, so that the temperature calculating unit 310 adjusts the calculating process on the basis of the resistance value change of the voltage division adjusting unit 200 to calculate the temperature value.
The temperature calculating unit 310 may be a single chip or an embedded chip, which can calculate a temperature value according to the obtained divided voltage detection signal. The control unit 320 may be a single chip or an embedded chip or other devices capable of receiving, processing, and generating signals to generate control signals to control the operation of the voltage division adjusting unit 200; the control unit 320 may also be an embodiment including a conventional comparator circuit, and when the divided voltage detection signal transmitted by the temperature calculation unit 310 exceeds a preset threshold, the comparator circuit outputs a control signal to control the divided voltage adjustment unit 200 to operate. The thermistor 100 may have a negative temperature coefficient characteristic or a positive temperature coefficient characteristic.
For more convenient understanding, the actual value is taken as an example to illustrate that the thermistor 100 has a negative temperature coefficient characteristic, the resistance of the thermistor 100 is about 100k ohms in a normal temperature state, and assuming that the resistance of the voltage division adjusting unit 200 is also 100k ohms, the divided voltage values of the two are approximately the same, the change of the resistance of the thermistor 100 can obviously change the voltage value of the detection point between the two, and the temperature calculating unit 310 can calculate the detected temperature value according to the change of the detected voltage value. In a high temperature state, the resistance of the thermistor 100 is about 100 ohms, and if the resistance of the voltage division adjusting unit 200 is still 100 kohms without changing, that is, in a conventional case, the voltage division value of the thermistor 100 is one thousandth of the voltage division value of the voltage division adjusting unit 200, and at this time, the change in the resistance of the thermistor 100 has little influence on the voltage value of the detection point between the two, and can even be ignored, so that the temperature calculating unit 310 cannot accurately calculate and identify the current temperature. Therefore, in the high temperature state, the control unit 320 controls the voltage division adjusting unit 200 to adjust the resistance value to 100 ohms so as to adjust the voltage division value of the voltage division adjusting unit 200, and reduce the voltage difference between the thermistor 100 and the voltage division adjusting unit 200, so that in the high temperature state, the change of the resistance value of the thermistor 100 can also obviously change the voltage value of the detection point, thereby improving the accuracy of temperature detection of the thermistor 100 in the high temperature state.
The foregoing is merely one embodiment of the present invention to facilitate understanding and is not intended to limit the invention thereto. The thermistor 100 can also have a positive temperature coefficient characteristic, similar to the above.
Referring to fig. 1, in some embodiments of the present invention, the voltage division adjusting unit 200 includes at least two voltage division parts 210, one end of each voltage division part 210 is connected to the thermistor 100 and the temperature calculating unit 310, respectively, and the other end of at least one voltage division part 210 is connected to the control unit 320.
The control unit 320 is connected to the other end of the voltage divider 210, and the control unit 320 can control the parallel connection between the voltage divider 210 by changing the connection state of the other end of the voltage divider 210, and further, the effect of adjusting the divided voltage value of the divided voltage adjusting unit is achieved because the equivalent resistance value of the parallel connection between the voltage divider 210 is changed. At least two voltage dividing components 210 are adopted, the number of the voltage dividing components 210 forming a voltage dividing circuit with the thermistor 100 is switched, the equivalent resistance value is changed, the effect of adjusting the voltage dividing value of the voltage dividing adjusting unit 200 is achieved, and the structure is simple and convenient to implement.
The voltage division adjusting unit 200 may also be a switching device such as a single triode or MOS transistor, and the control unit adjusts the conduction degree of the switching device to adjust the equivalent resistance value, thereby achieving the purpose of adjusting the voltage division.
Referring to fig. 1, in some embodiments of the present invention, the voltage division adjusting unit 200 includes two voltage division parts 210, the two voltage division parts 210 are a resistor R1 and a resistor R2, respectively, the thermistor 100 is connected to the temperature calculating unit 310, one end of the resistor R1, and one end of the resistor R2, respectively, the other end of the resistor R1 is connected to the control unit 320, and the other end of the resistor R2 is grounded.
The resistor R1 and the resistor R2 are simple in structure, and implementation cost is saved. When the thermistor 100 has the negative temperature coefficient characteristic, the thermistor 100 and the resistor R2 form a voltage dividing circuit at normal temperature, and the control unit 320 changes the other end of the resistor R1 to low level at high temperature, so that the resistor R1 is connected in parallel with the resistor R2 and then connected with the thermistor 100 to form a voltage dividing circuit, and since the equivalent resistance is reduced after the resistor R1 and the resistor R2 are connected in parallel, the temperature detecting accuracy at high temperature of the thermistor 100 with the negative temperature coefficient characteristic is improved.
When the thermistor 100 has the positive temperature coefficient characteristic, contrary to the above situation, the resistor R1 is connected in parallel with the resistor R2 at the normal temperature state and then forms a voltage dividing circuit with the thermistor 100, and in the high temperature state, the control unit 320 changes the other end of the resistor R1 to the high resistance state, which is equivalent to that the other end of the resistor R1 is disconnected, so that the thermistor 100 and the resistor R2 form a voltage dividing circuit, thereby adapting to the situation that the resistance value of the thermistor 100 with the positive temperature coefficient characteristic increases at the high temperature state.
Referring to fig. 1, in some embodiments of the present invention, the control unit 320 is provided with a push-pull unit 321, and the control unit 320 is connected to the other end of the voltage dividing member 210 through the push-pull unit 321.
The control unit 320 changes the connection state of the other end of the voltage divider 210 by controlling the conduction state of the upper switch tube and the lower switch tube in the push-pull unit 321, so as to control the voltage divider 210 to be connected in parallel, and the control method is simple and convenient to implement. The push-pull unit 321 may be a triode push-pull circuit, a MOS transistor push-pull circuit, or the like. When the control unit 320 is implemented by a single chip, the push-pull unit 321 may be a push-pull circuit integrated in the single chip and connected to the I/O pin, and controls the parallel connection between the voltage dividers 210 by changing the I/O pin to be in a high impedance state or outputting a low level.
Referring to fig. 1, in some embodiments of the present invention, a filtering unit 400 is further included, and the temperature calculating unit 310 is connected to the voltage dividing circuit through the filtering unit 400.
The filtering unit 400 can filter out interference signals such as spike pulses, so that the signals transmitted to the temperature calculating unit 310 are more gentle, thereby protecting the temperature calculating unit 310 from damage caused by the signals such as spike pulses and improving reliability.
Referring to fig. 1, in some embodiments of the present invention, the filtering unit 400 includes a resistor R3 and a capacitor C1, one end of the resistor R3 is connected to the thermistor 100 and the voltage division adjusting unit 200, the other end of the resistor R3 is connected to the temperature calculating unit 310 and one end of the capacitor C1, and the other end of the capacitor C1 is grounded.
The resistor R3 and the capacitor C1 form an RC filter circuit, so that the structure is simple and the implementation is convenient.
In some embodiments of the present invention, the temperature calculating unit 310 is provided with an analog-to-digital converting unit, and an input end of the analog-to-digital converting unit is connected to the voltage dividing circuit.
Because the voltage division circuit outputs an analog signal, the analog signal is converted into a digital signal through the analog-to-digital conversion unit, so that subsequent processing such as obtaining a detection temperature value through subsequent calculation is facilitated. The analog-to-digital conversion unit may be a common analog-to-digital conversion circuit, and when the temperature calculation unit 310 is a single chip microcomputer or other device, the analog-to-digital conversion unit may also be an analog-to-digital conversion module integrated in the single chip microcomputer.
In some embodiments, the temperature calculation unit 310 and the control unit 320 may be the same device, such as a single chip, an embedded chip, or the like.
The embodiment of the second aspect of the invention is applied to the control method of the temperature detection circuit, which comprises the following steps: the processing module 300 obtains a voltage division detection signal of the voltage division circuit; when the divided voltage detection signal exceeds the preset threshold, the processing module 300 controls the divided voltage adjusting unit 200 to adjust the resistance value, so as to reduce the voltage difference between the thermistor 100 and the divided voltage adjusting unit 200.
When the thermistor 100 has a negative temperature coefficient, the resistance of the thermistor 100 gradually decreases with increasing temperature, so that the detected voltage value and current value gradually increase, and when the voltage value and the current value are greater than the preset threshold, it is determined that the thermistor 100 is in a high-temperature state. When the thermistor 100 has a positive temperature coefficient, the resistance of the thermistor 100 gradually increases with the increase of temperature, so that the detected voltage value and the detected current value gradually decrease, and when the voltage value and the current value are smaller than the preset threshold, it is determined that the thermistor 100 is in a high-temperature state. When the thermistor 100 is in a high-temperature state, the processing module 300 controls the voltage division adjusting unit 200 to adjust the resistance value, so that the difference between the voltage division value of the thermistor 100 and the voltage division value of the voltage division adjusting unit 200 is reduced, that is, the voltage difference is reduced, and further, the resistance value of the thermistor 100 changes to enable the detection voltage value and the detection current value to change obviously in the high-temperature state, which is beneficial to improving the accuracy of temperature detection in the high-temperature state.
When the thermistor 100 has a negative temperature coefficient characteristic, the resistance of the thermistor 100 is small in a high temperature state, and the equivalent resistance of the voltage division adjusting unit 200 is correspondingly reduced, thereby achieving an effect of improving the temperature detection accuracy. However, in the above case, the resistance of the whole voltage divider circuit is small, the current is large, the loss of electric energy is also large, which is not beneficial to energy saving, and when the battery is used for supplying power, the service life of the battery is short.
In view of the above problem, in some embodiments of the present invention, after the divided voltage detection signal exceeds the preset threshold, the processing module 300 periodically controls the divided voltage adjustment unit 200 to adjust the magnitude of the resistance value according to a preset time.
The processing module 300 periodically controls the voltage division adjusting unit 200 to adjust the resistance value according to a preset time, for example, the voltage division adjusting unit 200 is controlled to adjust the resistance value for 0.2 second per second. The equivalent resistance value of the voltage division adjusting unit 200 is small in 0.2 second per second, so that the effect of detecting the temperature value with high accuracy is achieved, and in addition, the equivalent resistance value of the voltage division adjusting unit 200 is large in 0.8 second, so that the loss generated by current is small. Therefore, the effect of improving the temperature detection accuracy in a high-temperature state can be realized, the effect of saving energy can be realized, and the service life of the battery can be prolonged under the condition of using the battery for power supply.
A gas range according to an embodiment of the third aspect of the present invention includes: the stove body is provided with the temperature detection circuit.
Be provided with a foretell temperature-detecting circuit on the kitchen body, thermistor 100 can detect the temperature when the kitchen body heats external container, through when heating, under the high temperature state promptly, processing module 300 control partial pressure regulating unit 200 adjusts the size of resistance value, and then improves the degree of accuracy that the temperature detected, is favorable to detecting the container temperature when heating more accurately, avoids appearing the condition such as dry combustion method, prevents unexpected emergence, improves the security.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The invention is not limited to the above embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the invention, and such equivalent modifications or substitutions are included in the scope defined by the claims of the present application.
Claims (10)
1. A temperature sensing circuit, comprising:
a thermistor (100);
the voltage division adjusting unit (200), the voltage division adjusting unit (200) and the thermistor (100) are connected to form a voltage division circuit;
the processing module (300), the processing module (300) with divide voltage circuit connection in order to obtain the partial pressure detected signal, processing module (300) with the control end of partial pressure regulating unit (200) is connected in order to adjust according to the partial pressure detected signal the resistance value of partial pressure regulating unit (200).
2. A temperature sensing circuit according to claim 1, wherein: the processing module (300) comprises a temperature calculating unit (310) and a control unit (320), wherein the temperature calculating unit (310) is respectively connected with the voltage dividing circuit and the control unit (320), and the control unit is connected with the control end of the voltage dividing adjusting unit (200).
3. A temperature sensing circuit according to claim 2, wherein: the voltage division adjusting unit (200) comprises at least two voltage division parts (210), one end of each voltage division part (210) is respectively connected with the thermistor (100) and the temperature calculating unit (310), and the other end of at least one voltage division part (210) is connected with the control unit (320).
4. A temperature sensing circuit according to claim 3, wherein: the voltage division adjusting unit (200) comprises two voltage division parts (210), the two voltage division parts (210) are a resistor R1 and a resistor R2 respectively, the thermistor (100) is connected with the temperature calculating unit (310), one end of a resistor R1 and one end of a resistor R2 respectively, the other end of the resistor R1 is connected with the control unit (320), and the other end of the resistor R2 is grounded.
5. A temperature sensing circuit according to claim 3, wherein: the control unit (320) is provided with a push-pull unit (321), and the control unit (320) is connected with the other end of the pressure dividing piece (210) through the push-pull unit (321).
6. A temperature sensing circuit according to claim 2, wherein: the temperature control circuit further comprises a filtering unit (400), and the temperature calculating unit (310) is connected with the voltage dividing circuit through the filtering unit (400).
7. The temperature sensing circuit of claim 6, wherein: the filtering unit (400) comprises a resistor R3 and a capacitor C1, one end of the resistor R3 is connected with the thermistor (100) and the voltage division adjusting unit (200) respectively, the other end of the resistor R3 is connected with the temperature calculating unit (310) and one end of the capacitor C1 respectively, and the other end of the capacitor C1 is grounded.
8. The control method applied to the temperature detection circuit of any one of claims 1 to 7, characterized in that:
the processing module (300) acquires a voltage division detection signal of the voltage division circuit;
when the divided voltage detection signal exceeds a preset threshold value, the processing module (300) controls the divided voltage adjusting unit (200) to adjust the resistance value so as to reduce the voltage difference between the thermistor (100) and the divided voltage adjusting unit (200).
9. The control method according to claim 8, characterized in that: after the partial pressure detection signal exceeds a preset threshold value, the processing module (300) periodically controls the partial pressure adjusting unit (200) to adjust the resistance value according to a preset time.
10. Gas-cooker, its characterized in that includes: a cooktop provided with a temperature detection circuit as claimed in any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011383546.1A CN112504499A (en) | 2020-12-01 | 2020-12-01 | Temperature detection circuit, control method and gas stove |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011383546.1A CN112504499A (en) | 2020-12-01 | 2020-12-01 | Temperature detection circuit, control method and gas stove |
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| CN112504499A true CN112504499A (en) | 2021-03-16 |
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| CN202011383546.1A Pending CN112504499A (en) | 2020-12-01 | 2020-12-01 | Temperature detection circuit, control method and gas stove |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113340451A (en) * | 2021-06-28 | 2021-09-03 | 展讯通信（深圳）有限公司 | Temperature detection method and temperature detection device |
| CN113640336A (en) * | 2021-08-23 | 2021-11-12 | 广东纯米电器科技有限公司 | Boiling point detection method, device, circuit and cooking utensil |
| CN113686458A (en) * | 2021-08-31 | 2021-11-23 | 海信家电集团股份有限公司 | Temperature measurement circuit, temperature measurement equipment and temperature measurement method |
-
2020
- 2020-12-01 CN CN202011383546.1A patent/CN112504499A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113340451A (en) * | 2021-06-28 | 2021-09-03 | 展讯通信（深圳）有限公司 | Temperature detection method and temperature detection device |
| CN113640336A (en) * | 2021-08-23 | 2021-11-12 | 广东纯米电器科技有限公司 | Boiling point detection method, device, circuit and cooking utensil |
| CN113686458A (en) * | 2021-08-31 | 2021-11-23 | 海信家电集团股份有限公司 | Temperature measurement circuit, temperature measurement equipment and temperature measurement method |
| CN113686458B (en) * | 2021-08-31 | 2024-04-09 | 海信家电集团股份有限公司 | Temperature measuring circuit, temperature measuring equipment and temperature measuring method |
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