CN215686643U - Cooking utensil - Google Patents
Cooking utensil Download PDFInfo
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- CN215686643U CN215686643U CN202120662427.3U CN202120662427U CN215686643U CN 215686643 U CN215686643 U CN 215686643U CN 202120662427 U CN202120662427 U CN 202120662427U CN 215686643 U CN215686643 U CN 215686643U
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- acquisition circuit
- temperature range
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Abstract
The utility model discloses a cooking appliance, comprising: the cooker comprises a cooker body, an inner pot, a cover body, a heating device and a temperature detection circuit, wherein the temperature detection circuit comprises a thermistor, a first voltage acquisition circuit, a second voltage acquisition circuit and an MCU (microprogrammed control unit), the first voltage acquisition circuit and the second voltage acquisition circuit are connected to one end of the thermistor in parallel, and the other end of the thermistor is used for being connected with the anode of a power supply; the other end of the first voltage acquisition circuit is connected with a first enabling end of the MCU, and the other end of the second voltage acquisition circuit is connected with a second enabling end of the MCU; the first voltage acquisition circuit is used for detecting the voltage value in a first preset temperature range, the second voltage acquisition circuit is used for detecting the voltage value in a second preset temperature range, and the first preset temperature range is different from the second preset temperature range. Although only one thermistor is arranged, the temperature measurement accuracy of different temperature sections (high and low temperature sections) can be ensured by controlling the first and second voltage acquisition circuits.
Description
Technical Field
The utility model relates to the field of cooking appliances, in particular to a cooking appliance.
Background
The temperature sensor and the detection circuit of the current kitchen electrical appliance, such as an electric stewpot, an electric cooker and the like, can sense temperature accurately within 160 ℃, and the temperature measurement accuracy is relatively poor within the temperature range exceeding 160 ℃. Therefore, for a cooking appliance with a cooking function in a high temperature section (for example, the temperature requirement is between 160 and 240 ℃) such as baking and frying, the temperature measurement by using the conventional common sensor and the detection circuit is poor in precision in the high temperature section, and cannot be accurately controlled, and at this time, a sensor and a hardware circuit suitable for the high temperature section are required to be added, so that the structural design of the circuit board of the cooking appliance is limited and the cost is increased.
The present application therefore proposes an improved cooking appliance to at least partially solve the above mentioned problems.
SUMMERY OF THE UTILITY MODEL
In the summary section a series of concepts in a simplified form is introduced, which will be described in further detail in the detailed description section. The inventive content of the present invention is not intended to define key features or essential features of the claimed solution, nor is it intended to be used to limit the scope of the claimed solution.
In order to at least partially solve the above problems, the present invention provides a cooking appliance including: a pot body; the inner pot is arranged in the pot body; the cover body can cover the cooker body, and when the cover body covers the cooker body, a cooking space is formed between the cover body and the inner pot; the heating device is used for heating the inner pot; and a temperature detection circuit; the temperature detection circuit comprises a thermistor, a first voltage acquisition circuit, a second voltage acquisition circuit and an MCU (microprogrammed control unit), wherein the first voltage acquisition circuit and the second voltage acquisition circuit are connected to one end of the thermistor in parallel, and the other end of the thermistor is used for being connected with the anode of a power supply; the other end of the first voltage acquisition circuit is connected with a first enabling end of the MCU, and the other end of the second voltage acquisition circuit is connected with a second enabling end of the MCU; the first voltage acquisition circuit is used for detecting the voltage value in a first preset temperature range, the second voltage acquisition circuit is used for detecting the voltage value in a second preset temperature range, and the first preset temperature range is different from the second preset temperature range.
According to the cooking utensil of the utility model, the temperature detection circuit is only provided with one thermistor and is provided with a first voltage acquisition circuit and a second voltage acquisition circuit, wherein the first voltage acquisition circuit is used for detecting the voltage value in a first preset temperature range, the second voltage acquisition circuit is used for detecting the voltage value in a second preset temperature range, and the first preset temperature range is different from the second preset temperature range; the MCU ensures the temperature measurement precision of different temperature sections (high and low temperature sections) by enabling the first enabling end and the second enabling end not to be high level or low level at the same time during normal work.
Preferably, the lower limit value of the first predetermined temperature range is higher than the upper limit value of the second predetermined temperature range.
Preferably, the first predetermined temperature range is 160 ℃ -240 ℃ and the second predetermined temperature range is 10 ℃ -159 ℃.
Preferably, the first voltage acquisition circuit comprises a first pull-down resistor, and the resistance value of the first pull-down resistor is selected between 500 Ω -4K.
It can be understood that, since the first voltage acquisition circuit is used for detecting the voltage value in the first predetermined temperature range, the resistance value of the first pull-down resistor is selected between 500 Ω -4K to adapt to the first predetermined temperature range, that is, the first pull-down resistor with the resistance value in the range enables the AD value detected by the a/D port of the MCU to change significantly with temperature change in the first predetermined temperature range of the thermistor, so that the temperature measurement accuracy in the first predetermined temperature range is high.
Preferably, a first resistance value of the thermistor corresponding to a highest temperature detection point of temperature accuracy requirements in a cooking mode of the cooking appliance in the first predetermined temperature range is obtained according to the temperature-resistance value table of the thermistor, and the resistance value of the first pull-down resistor is the first resistance value.
Therefore, the temperature measurement precision of the A/D port of the MCU can be ensured to be higher.
Preferably, the second voltage acquisition circuit comprises a second pull-down resistor, and the resistance value of the second pull-down resistor is selected from 4K to 30K.
It can be understood that, since the second voltage acquisition circuit is used for detecting the voltage value in the second predetermined temperature range, the resistance value of the second pull-down resistor is selected between 4K and 30K to adapt to the second predetermined temperature range, that is, the second pull-down resistor with the resistance value in the range enables the AD value detected by the a/D port of the MCU to change obviously with the temperature change of the thermistor in the second predetermined temperature range, so that the temperature measurement accuracy in the second predetermined temperature range is high.
Preferably, a second resistance value of the thermistor corresponding to a highest temperature detection point of temperature accuracy requirement in a cooking mode of the cooking appliance in the second predetermined temperature range is obtained according to the temperature-resistance value table of the thermistor, and the resistance value of the second pull-down resistor is the second resistance value.
Therefore, the temperature measurement precision of the A/D port of the MCU can be ensured to be higher.
Preferably, a filter circuit is arranged between the thermistor and the A/D end of the MCU.
Preferably, the filter circuit is an RC filter circuit.
Therefore, the MCU port can be protected to prevent the over-large current from flowing, and simultaneously RC filtering is formed, so that the signal detection is more stable.
Drawings
The following drawings of embodiments of the utility model are included as part of the present invention for an understanding of the utility model. The drawings illustrate embodiments of the utility model and, together with the description, serve to explain the principles of the utility model. In the drawings, there is shown in the drawings,
fig. 1 is a schematic diagram of a temperature detection circuit of a cooking appliance according to a preferred embodiment of the present invention;
fig. 2 is a flowchart of a preferred embodiment of a temperature detection method for a cooking appliance.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that embodiments of the utility model may be practiced without one or more of these specific details. In other instances, well-known features have not been described in detail so as not to obscure the embodiments of the utility model.
In the following description, a detailed structure will be presented for a thorough understanding of embodiments of the utility model. It is apparent that the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art. The following detailed description of the preferred embodiments of the utility model, however, the utility model is capable of other embodiments in addition to those detailed.
The utility model provides a cooking appliance which can be an electric cooker or other electric heating appliances. In addition, the cooking appliance may have other functions such as cooking porridge and cooking soup in addition to the function of cooking rice.
The cooking appliance according to the present embodiment may have various structures, and generally includes a pot body as an example. The pot body may be in a generally rounded rectangular parallelepiped shape, a generally cylindrical shape, or any other suitable shape. An inner pot of generally cylindrical shape or any other suitable shape is provided in the pot body. The inner pot can be freely put into the inner pot containing part of the cooker body or taken out of the inner pot containing part, so that the inner pot is convenient to clean. The inner pot is used for storing food to be cooked, such as rice, soup, etc. The top of the inner pot is provided with a top opening. The user can store food to be cooked in the inner pot through the top opening or take cooked food out of the inner pot through the top opening.
The cooker body is provided with a cover body. The shape of the cover body basically corresponds to the shape of the cooker body. For example, the cover may have a rounded rectangular parallelepiped shape. The cover body is arranged on the cooker body in an openable and closable manner and is used for covering the whole top of the cooker body or at least the inner pot of the cooker body. Specifically, in the present embodiment, the lid body may be pivotably provided above the pot body between the maximum open position and the closed position by, for example, a hinge. When the cover body is covered on the pot body, a cooking space is formed between the cover body and the pot body (specifically, the inner pot of the pot body).
In this embodiment, the cover body may include a face cover, an inner liner, and a detachable cover. The inner liner has high strength, can play a supporting role, and can be integrally provided with functional elements such as a sensing element, a pressure control element and the like, so that the structure of the cooking appliance is kept compact. The surface cover covers the outer side of the lining, protects the lining and parts arranged on the lining, and meanwhile, the cover body is attractive on the whole.
The cooking appliance of the present embodiment is also provided with a heating device. The heating device is arranged in the cooker body and can heat the inner pot at the bottom and/or the side part of the inner pot. The heating device may be an electrically heated tube or may be an induction heating device such as a solenoid coil. In the construction in which the cooking appliance comprises a detachable base, the heating means may also be provided in the base of the cooking appliance.
The cooking appliance of the present invention is further provided with a temperature detection circuit as shown in fig. 1. The temperature detection circuit may include a temperature sensor for detecting the temperature of the cooking space in real time. The temperature sensor may be a temperature probe. The temperature measuring probe can be a thermistor, such as an NTC thermistor or a PTC thermistor. The temperature detection circuit may be connected to a main control chip of the cooking appliance to feed back the sensed temperature signal to the main control chip after sensing the temperature of the cooking space, so that the main control chip can realize more accurate control of the process of cooking based on the temperature signal. In addition, the cooking appliance may further include a power supply board that supplies power to the control device and the like.
Specifically, as shown in fig. 1, the temperature detection Circuit includes a thermistor R4, a first voltage acquisition Circuit, a second voltage acquisition Circuit, and an mcu (microsoft Circuit unit).
The first voltage acquisition circuit and the second voltage acquisition circuit are connected to one end of the thermistor R4 in parallel, and the other end of the thermistor R4 is connected with the positive pole of a power supply. The other end of the first voltage acquisition circuit is connected with a first enabling end PIO1 of the MCU, and the other end of the second voltage acquisition circuit is connected with a second enabling end PIO2 of the MCU. The first voltage acquisition circuit is used for detecting the voltage value in a first preset temperature range, the second voltage acquisition circuit is used for detecting the voltage value in a second preset temperature range, and the first preset temperature range is different from the second preset temperature range.
Therefore, the MCU can ensure the temperature measurement accuracy of different temperature ranges (high and low temperature ranges) by making the first enable port PIO1 and the second enable port PIO2 not be at high level or low level at the same time during normal operation.
More specifically, the first voltage acquisition circuit includes a first pull-down resistor R1, and the second voltage acquisition circuit includes a second pull-down resistor R2. The first voltage acquisition circuit and the second voltage acquisition circuit are suitable for temperature detection in different preset temperature ranges due to different resistance values of the pull-down resistors. Specifically, the value of the first pull-down resistor R1 may be selected to be between 500 Ω -4K. A first pull-down resistance R1 selected between 500 omega-4K is preferably applied for a first predetermined temperature range of 160 c-240 c. The value of the second pull-down resistor R2 may be selected to be between 4K and 30K. A second pull-down resistance R2 selected between 4K and 30K is preferably applied for a second predetermined temperature range of 10 c to 159 c. It should be noted that the resistance ranges of 500 Ω -4K and 4K-30K are inclusive.
More specifically, a first resistance value of the thermistor R4 corresponding to a temperature accuracy requirement maximum temperature detection point (e.g., a preset temperature of 185 ℃) in a cooking mode of the cooking appliance in a first predetermined temperature range, e.g., 160 ℃ to 240 ℃, may also be obtained from the temperature-resistance table of the thermistor R4, and the resistance value of the first pull-down resistor R1 is the first resistance value. Similarly, a second resistance value of the thermistor R4 corresponding to a highest temperature detection point required for temperature accuracy in the cooking mode of the cooking appliance (e.g., a preset 130 ℃) in a second predetermined temperature range, e.g., 10 ℃ to 159 ℃, which is obtained from the temperature-resistance table of the thermistor R4, and the resistance value of the second pull-down resistor R2 is the second resistance value.
In one embodiment, when the temperature of the thermistor R4 is detected, the MCU sets the second enable terminal PIO2 to high level, sets the first enable terminal PIO1 to low level, the first voltage acquisition circuit is suspended, the second voltage acquisition circuit is operated, and the MCU performs temperature detection in a second predetermined temperature range. After the temperature detection in the second preset temperature range is completed, the MCU can set the second enabling end PIO2 to be at a low level and set the first enabling end to be at a high level, then the first voltage acquisition circuit works, the second voltage acquisition circuit is suspended, and the MCU completes the temperature detection in the first preset temperature range.
Since R1 and R2 are pull-down resistors, after a suitable voltage is given, R1 and thermistor R4, and R2 and thermistor R4 both form series voltage division, since the resistance values of the first pull-down resistor R1 and the second pull-down resistor R2 are preset as described above, and the resistance value of the thermistor R4 changes with temperature, and the voltage division values are different at different temperatures, the MCU first reads the voltage division value, calculates the current resistance value of the thermistor R4, converts the current resistance value into an AD value through an AD converter, and then reversely deduces the current temperature according to a temperature-AD value comparison table.
Of course, a filter circuit may be provided between the thermistor R4 and the A/D terminal of the MCU. As shown in fig. 1, the filter circuit may be an RC filter circuit composed of a third resistor R3 and a capacitor C1. Therefore, the MCU port can be protected to prevent the over-large current from flowing, and simultaneously RC filtering is formed, so that the signal detection is more stable.
In addition, the embodiment also provides a temperature detection method for the cooking appliance. Specifically, the detection method comprises the following steps:
controlling a first enabling end and a second enabling end of the MCU to be not at a high level or a low level at the same time when the MCU works normally, so that the MCU samples the situation that the thermistor R4 is in a first preset temperature range and a second preset temperature range respectively;
in the sampling process of the corresponding temperature range, sampling is carried out on the thermistor for N times to obtain N sampling values, wherein N is larger than or equal to 4, the N sampling values are respectively converted into AD values, then an average value is calculated, and the temperature of the cooking cavity of the cooking appliance is obtained according to the average value.
Specifically, as shown in fig. 2, after the temperature measurement program starts, the temperature measurement program is initialized, and the flag ad flag bit of the MCU is set as: FlagAd ═ 0; correspondingly, the PIO2 is set to be in a low level, the PIO1 is set to be in an input state, that is, temperature detection in a first preset temperature range is firstly performed, the ADC conversion module performs conversion from temperature to AD value (ADCDRH), 1 is added to the counter every time the conversion is performed, when the number of conversion times reaches preset N times (for example, 4 times), an average TempAdL of 4 AD values is obtained, and the temperature of the cooking appliance is obtained by looking up a table according to the average TempAdL. After the temperature detection in the first preset temperature range is finished, the flag bit of flagAd is turned over as follows: FlagAd is 1, whereby temperature detection of the second predetermined temperature range is performed. This enables accurate detection of the entire temperature range (high-temperature range and low-temperature range).
According to the cooking utensil of the utility model, the temperature detection circuit is only provided with one thermistor and is provided with a first voltage acquisition circuit and a second voltage acquisition circuit, wherein the first voltage acquisition circuit is used for detecting the voltage value in a first preset temperature range, the second voltage acquisition circuit is used for detecting the voltage value in a second preset temperature range, and the first preset temperature range is different from the second preset temperature range; the MCU ensures the temperature measurement precision of different temperature sections (high and low temperature sections) by enabling the first enabling end and the second enabling end not to be high level or low level at the same time during normal work, and further improves the precision of a detection result by taking the average value of a plurality of sampling values corresponding to the actually detected temperature.
Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. Terms such as "component" and the like, when used herein, can refer to either a single part or a combination of parts. Terms such as "mounted," "disposed," and the like, as used herein, may refer to one component as being directly attached to another component or one component as being attached to another component through intervening components. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is otherwise inapplicable or otherwise stated in the other embodiment.
The present invention has been described in terms of the above embodiments, but it should be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the utility model to the scope of the described embodiments. It will be appreciated by those skilled in the art that many variations and modifications may be made to the teachings of the utility model, which fall within the scope of the utility model as claimed.
Claims (9)
1. A cooking appliance, characterized in that it comprises:
a pot body;
the inner pot is arranged in the pot body;
the cover body can cover the cooker body, and when the cover body covers the cooker body, a cooking space is formed between the cover body and the inner pot;
the heating device is used for heating the inner pot; and
a temperature detection circuit;
the temperature detection circuit comprises a thermistor, a first voltage acquisition circuit, a second voltage acquisition circuit and an MCU,
the first voltage acquisition circuit and the second voltage acquisition circuit are connected in parallel to one end of the thermistor, and the other end of the thermistor is used for connecting the positive pole of a power supply; the other end of the first voltage acquisition circuit is connected with a first enabling end of the MCU, and the other end of the second voltage acquisition circuit is connected with a second enabling end of the MCU; the first voltage acquisition circuit is used for detecting the voltage value in a first preset temperature range, the second voltage acquisition circuit is used for detecting the voltage value in a second preset temperature range, and the first preset temperature range is different from the second preset temperature range.
2. The cooking appliance of claim 1, wherein a lower limit of the first predetermined temperature range is higher than an upper limit of the second predetermined temperature range.
3. The cooking appliance of claim 2, wherein the first predetermined temperature range is 160 ℃ -240 ℃ and the second predetermined temperature range is 10 ℃ -159 ℃.
4. The cooking appliance of claim 2, wherein the first voltage acquisition circuit comprises a first pull-down resistor having a resistance selected between 500 Ω -4K.
5. The cooking appliance according to claim 4, wherein a first resistance value of the thermistor corresponding to a temperature accuracy requirement maximum temperature detection point in a cooking mode of the cooking appliance in the first predetermined temperature range is obtained from a temperature-resistance table of the thermistor, and the resistance value of the first pull-down resistor is the first resistance value.
6. The cooking appliance of claim 2, wherein the second voltage acquisition circuit comprises a second pull-down resistor having a resistance selected between 4K-30K.
7. The cooking appliance according to claim 6, wherein a second resistance value of the thermistor corresponding to a temperature accuracy requirement maximum temperature detection point in a cooking mode of the cooking appliance in the second predetermined temperature range is obtained from a temperature-resistance table of the thermistor, and the resistance value of the second pull-down resistor is the second resistance value.
8. The cooking appliance according to claim 1, wherein a filter circuit is provided between the thermistor and the a/D terminal of the MCU.
9. The cooking appliance of claim 8, wherein the filter circuit is an RC filter circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120662427.3U CN215686643U (en) | 2021-03-31 | 2021-03-31 | Cooking utensil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120662427.3U CN215686643U (en) | 2021-03-31 | 2021-03-31 | Cooking utensil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215686643U true CN215686643U (en) | 2022-02-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120662427.3U Active CN215686643U (en) | 2021-03-31 | 2021-03-31 | Cooking utensil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215686643U (en) |
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2021
- 2021-03-31 CN CN202120662427.3U patent/CN215686643U/en active Active
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