CN114642352A - Non-contact measuring device and method for household appliance, appliance and medium - Google Patents

Non-contact measuring device and method for household appliance, appliance and medium Download PDF

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Publication number
CN114642352A
CN114642352A CN202011497247.0A CN202011497247A CN114642352A CN 114642352 A CN114642352 A CN 114642352A CN 202011497247 A CN202011497247 A CN 202011497247A CN 114642352 A CN114642352 A CN 114642352A
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China
Prior art keywords
unit
excitation
signal
mutual inductance
thermistor
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CN202011497247.0A
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Chinese (zh)
Inventor
马志海
王云峰
江德勇
雷俊
许智波
刘志才
刘传兰
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Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
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Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
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Priority to CN202011497247.0A priority Critical patent/CN114642352A/en
Publication of CN114642352A publication Critical patent/CN114642352A/en
Pending legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J27/00—Cooking-vessels
    • A47J27/08—Pressure-cookers; Lids or locking devices specially adapted therefor
    • A47J27/0802—Control mechanisms for pressure-cookers
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J27/00—Cooking-vessels
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J27/00—Cooking-vessels
    • A47J27/08—Pressure-cookers; Lids or locking devices specially adapted therefor
    • A47J27/086—Pressure-cookers; Lids or locking devices specially adapted therefor with built-in heating means
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J36/00—Parts, details or accessories of cooking-vessels
    • A47J36/32—Time-controlled igniting mechanisms or alarm devices
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J37/00—Baking; Roasting; Grilling; Frying
    • A47J37/10—Frying pans, e.g. frying pans with integrated lids or basting devices
    • A47J37/105—Frying pans, e.g. frying pans with integrated lids or basting devices electrically heated
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
    • G01B7/023—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring distance between sensor and object
    • 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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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Cookers (AREA)

Abstract

The invention discloses a non-contact measuring device and method for a household appliance, the appliance and a medium. The measuring device comprises a first excitation unit, a first feedback unit, a second excitation unit and a second feedback unit. The first excitation unit is used for generating a first excitation signal, and the first feedback unit is used for generating first mutual inductance with the first excitation unit under the action of the first excitation signal; the first feedback unit is provided with a thermistor, and the first mutual inductance is changed along with the resistance value change of the thermistor. The signal detection unit is used for detecting a first electric signal used for measuring first mutual inductance on the first excitation unit. The result generation unit may be operable to determine a temperature of an environment in which the thermistor is located based on the first electrical signal. The invention has the outstanding advantages of simple product structure, stronger reliability, low cost, good parameter measurement effect, simple processing technique, easy maintenance when the product has a fault after long-term use and the like, has wider application range and can be applied to the detection of the relevant parameters of various household appliances.

Description

Non-contact measuring device and method for household appliance, appliance and medium
Technical Field
The invention relates to the technical field of household appliances, in particular to a non-contact measuring device and method for household appliances, an appliance and a medium.
Background
With the continuous development and use of intelligent home appliances, various sensors for measuring parameters of home appliance devices are widely used. For example, a temperature sensor for detecting the temperature in the pressure cooker, an electro-optical distance measuring sensor for detecting the distance between the pan body and the pan cover of the electric baking pan, and the like. However, the integration degree of the sensor is often high, and the sensor can hardly be maintained when damaged and generally only can be replaced by a new product. Moreover, the cost of the sensor product is relatively high, which undoubtedly increases the cost of the household appliance. In addition, different types of sensors are often purchased separately, design parameters, structural dimensions, implementation principles and the like of different sensors are generally different, and the design difficulty of the household appliance is obviously increased while the sensors are equipped, so that the product cost of the household appliance is further increased.
Disclosure of Invention
The invention mainly aims to provide a non-contact measuring device and method for a household appliance, the appliance and a medium, and aims to solve at least one problem that a sensor equipped in the existing household appliance is high in cost and difficult to maintain, and the design difficulty of the household appliance is increased by multiple sensors.
To achieve the above technical objects, one or more embodiments of the present invention can provide a non-contact measuring device for a home appliance, which includes, but is not limited to, a first exciting unit, a first feedback unit, a second exciting unit, and a second feedback unit. The first excitation unit is used for generating a first excitation signal. The first feedback unit is used for generating first mutual inductance with the first excitation unit under the action of the first excitation signal; the first feedback unit is provided with a thermistor, and the first mutual inductance is changed along with the change of the resistance value of the thermistor. The signal detection unit is used for detecting a first electric signal which is arranged on the first excitation unit and used for measuring the first mutual inductance. The result generating unit is used for determining the temperature of the environment where the thermistor is located according to the first electric signal.
Based on the technical scheme, the non-contact temperature measuring device can replace a conventional temperature sensor, has the outstanding advantages of very simple structure, low cost, easiness in maintenance and the like, and well solves at least one problem in the prior art.
Further, the non-contact measuring device may further include a second exciting unit and a second feedback unit. The second excitation unit is used for generating a second excitation signal. The second feedback unit is used for generating second mutual inductance with the second excitation unit under the action of a second excitation signal; the second feedback unit and the second excitation unit have a distance to be measured, and the distance to be measured is in negative correlation with the second mutual inductance. The signal detection unit is further used for detecting a second electric signal used for measuring the second mutual inductance on the second excitation unit, and the result generation unit is further used for determining the distance to be measured according to the second electric signal.
Based on the improved technical scheme, the invention can provide the non-contact measuring device with the dual functions of temperature measurement and distance measurement. The device accessible signal detection unit detects second signal of telecommunication or first signal of telecommunication, detects based on the signal of telecommunication and confirms temperature measurement or range finding result, and then has realized temperature measurement function or range finding function.
Further, the second excitation unit shares an inverter and a resonance capacitor connected in series with the inverter with the first excitation unit. The inverter is configured to generate an ac signal that is used to form the first excitation signal or the second excitation signal.
Based on the improved technical scheme, the device volume and the number of devices are greatly reduced by the shared inverter and the shared resonance capacitor. The invention innovatively realizes the functions of temperature measurement and distance measurement based on similar principles, greatly reduces the cost of the measuring device used by the household appliance, is beneficial to the overall design of household appliance products, and has the advantages of convenient maintenance and the like; in addition, the shared signal detection unit also helps to reduce the volume occupied by the device of the present invention.
Further, the first excitation unit comprises a first inductor and a first state switching module connected in series with the inverter; the first state switching module is used for controlling whether the first excitation unit generates a first excitation signal or not, and the first inductor is used for sending out the first excitation signal. The second excitation unit comprises a second inductor and a second state switching module which are connected with the inverter in series; the second state switching module is used for controlling whether the second excitation unit generates a second excitation signal or not, and the second inductor is used for sending out the second excitation signal.
Further, the first inductor and the second inductor are located on the same plane.
Further, the first electrical signal is a voltage signal or a current signal, and the second electrical signal is a voltage signal or a current signal.
To achieve the above technical object, the present invention can also provide a household appliance including the non-contact measuring device according to any one of the embodiments of the present invention.
Further, the household appliance comprises at least one of an electric baking pan, a pressure cooker and an electric cooker.
To achieve the above technical objects, one or more embodiments of the present invention can also provide a non-contact measuring method for a home appliance, which may include, but is not limited to, at least one of the following steps.
Detecting a first electric signal used for measuring first mutual inductance on the first excitation unit; the first excitation unit is used for generating first mutual inductance with the first feedback unit, the first feedback unit is provided with a thermistor, and the first mutual inductance is changed along with the change of the resistance value of the thermistor.
And determining the temperature of the environment where the thermistor is located according to the first electric signal.
Further, before the detecting the first electrical signal for measuring the first mutual inductance on the first excitation unit, the method may further include:
detecting a second electric signal used for measuring second mutual inductance on a second excitation unit; the second excitation unit is used for generating second mutual inductance with the second feedback unit, a distance to be measured is arranged between the second feedback unit and the second excitation unit, and the distance to be measured and the second mutual inductance are in negative correlation.
Determining the distance to be measured from the second electrical signal.
To achieve the above technical objects, the present invention can also provide a computer storage medium having computer-readable instructions stored thereon, which, when executed by one or more processors, cause the one or more processors to perform a non-contact measurement method in any embodiment of the present invention.
The invention has the beneficial effects that:
the invention can replace the temperature sensor and the distance sensor of household appliances in the market, innovatively integrates the temperature measuring device and the distance measuring device together, realizes the functions of distance measurement and temperature measurement, and simultaneously can greatly simplify the structural design of the product and reduce the product cost. The invention can also reduce the household appliance space occupied by the sensing equipment, reduce the difficulty of the designer for equipping the household appliance with the sensor, and further reduce the input cost of the household appliance.
The invention has the outstanding advantages of simple product structure, stronger reliability, low cost, good parameter measurement effect, simple processing technique, easy maintenance when the product has a fault after long-term use and the like, has wider application range and can be almost applied to the detection of various household appliances on temperature and distance parameters.
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 structures shown in the drawings without creative efforts.
Fig. 1 shows a schematic circuit configuration diagram of a temperature measuring part in a non-contact measuring device for a home appliance in some embodiments of the present invention.
Fig. 2 shows a schematic diagram of an overall circuit structure of a non-contact measuring device for a household appliance in one or more embodiments of the present invention.
Fig. 3 is a schematic diagram illustrating a position relationship between the first inductor and the second inductor in the same plane according to some embodiments of the present invention.
FIG. 4 is a schematic diagram showing a product structure in which the measuring device of at least one embodiment of the present invention is applied to an electric baking pan.
Fig. 5 shows a schematic diagram of a product structure in which the measuring device of at least one embodiment of the present invention is applied to a pressure cooker.
Fig. 6 shows a flow diagram of a contactless measurement method for a domestic appliance in one or more embodiments of the invention.
Fig. 7 shows a work flow diagram of applying the measuring method of at least one embodiment of the present invention to a home appliance.
In the figure, the position of the upper end of the main shaft,
100. a first excitation unit.
200. A first feedback unit.
300. A signal detection unit.
400. And a result generation unit.
101. A second excitation unit.
201. And a second feedback unit.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
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.
As shown in fig. 1, one or more embodiments of the present invention can specifically provide a non-contact measuring device for a household appliance, which may include, but is not limited to, a first exciting unit 100, a first feedback unit 200, a signal detecting unit 300, a result generating unit 400, and the like.
As shown in fig. 1, and may be combined with fig. 2. The first excitation unit 100 is configured to generate a first excitation signal. The first pumping unit 100 includes an inverter AC, a first capacitor, which is a resonant capacitor C11 for generating resonance in the present invention, a first inductor L11, and a first state switching module KT 1. The resonant capacitor C11, the first inductor L11 and the first state switching module KT1 are all connected in series with the inverter AC; the first inductor L11 forms a first resistor R11 when the loop is in operation. The inverter AC is specifically configured to generate an alternating current signal, forming a first excitation signal via the resonant capacitor C11. Wherein, the first state switching module KT1 is used to control whether the first excitation unit 100 generates the first excitation signal, and the first state switching module KT1 in this embodiment is a relay: the first state-switching module KT1 generates the first pumping signal when it is closed, and the first state-switching module KT1 does not generate the first pumping signal when it is open. The first inductor L11 is used to emit a first excitation signal when the first excitation signal is generated.
The first feedback unit 200 is configured to generate a first mutual inductance with the first excitation unit 100 under the action of the first excitation signal. The first feedback unit 200 includes a second capacitor C12, a first feedback inductor L12, and a thermistor R12. It can be understood that the second capacitor C12, the first feedback inductor L12 and the thermistor R12 in this embodiment are connected in series to form a loop, and the first mutual inductance varies with the resistance of the thermistor R12 in the first feedback unit 200. Of course, the present invention is not limited to the illustrated circuit configuration, and the second capacitor C12 and the first feedback inductor L12 may be connected in parallel. It is understood that the first mutual inductance may increase as the resistance of the thermistor increases, or the first mutual inductance may decrease as the resistance of the thermistor increases, because the thermistor used in the embodiments of the present invention may be a positive temperature coefficient thermistor or a negative temperature coefficient thermistor.
The signal detection unit 300 is configured to detect a first electrical signal on the first excitation unit 100 for measuring a first mutual inductance. The first electrical signal in the present invention may be a voltage signal or a current signal I11In order to simplify the circuit structure, the present invention takes voltage signal detection as an example. The signal detection unit 300 in fig. 1 includes a diode D1, a resistor R1, and a resistor R2 connected in series, and the entire signal detection unit 300 is connected in parallel with the inverter AC and the resonant capacitor C11. The resistor R1 and the resistor R2 perform a voltage dividing function, and the voltage signal between the resistor R1 and the resistor R2 is used as the first electrical signal in this embodiment.
The result generation unit 400 is used to determine the temperature of the environment in which the thermistor R12 is located, from the first electrical signal. The result generation unit 400 of the present invention may be integrated on a controller of the home appliance, i.e., the present invention can implement the function of the result generation unit 400 through the home appliance controller.
It can be understood that, the relationship between the first electrical signal and the temperature of the environment where the thermistor R12 is located, the present invention can form the corresponding relationship between the voltage value and the temperature value into a voltage-temperature relationship table by means of product testing, and can use the voltage to calculate the relationship between the voltage value and the temperature value-the temperature relationship table is stored in the household appliance chip, and the corresponding voltage value U is detectedtdThe corresponding temperature value T can then be detected by means of a table lookup to determine the temperature of the environment in which the thermistor R12 is located. Alternatively, the invention may establish in advance a functional relationship between the voltage value and the temperature value, for example, T ═ f1(Utd). The corresponding voltage value U can be detectedtdAnd then, directly determining the temperature value T by a function calculation mode. F for different household appliances or different equipment parameters1(x) The present invention is not described in detail, which is often different.
As shown in fig. 2, the measuring apparatus with temperature measuring and ranging functions includes, but is not limited to, a first exciting unit 100, a first feedback unit 200, a second exciting unit 101, a second feedback unit 201, a signal detecting unit 300, and a result generating unit 400. The connection relationship, functions and principles among the first excitation unit 100, the first feedback unit 200, the signal detection unit 300 and the result generation unit 400 are as described above, and thus are not described in detail.
The second excitation unit 101 in the present invention is used for generating a second excitation signal. The second excitation unit 101 shown in fig. 2 shares the inverter AC and the resonant capacitor C11 with the first excitation unit 100.
The second excitation unit 101 includes an inverter AC, a resonant capacitor C11, a second inductor L21, and a second state switching module KT2 connected in series. The second state-switching module KT2 is used to control whether the second pumping unit 101 generates the second pumping signal, and the second state-switching module KT2 is also a relay. The second inductor L21 is used to emit a second excitation signal when the second state-switching module KT2 is closed. The inverter AC, which is connected in series with the resonant capacitor C11, is used to generate an alternating signal which is used to form the second excitation signal when measuring the distance or which is used to form the first excitation signal when measuring the temperature.
The second feedback unit 201 is configured to generate a second mutual inductance with the second excitation unit 101 under the action of the second excitation signal, a distance d to be measured is provided between the second feedback unit 201 and the second excitation unit 101, and the distance d to be measured and the second mutual inductance are in a negative correlation. Therefore, the larger the second mutual inductance value detected by the invention is, the smaller the distance value to be measured is; the smaller the detected second mutual inductance value is, the larger the value of the distance to be measured is; and the second mutual inductance is also detected by detection of the electrical signal.
The second feedback unit 201 includes a third capacitor C22, a second feedback inductor L22, and a resistor R22. In the invention, the third capacitor C22, the second feedback inductor L22 and the resistor R22 may be connected in series to form a loop, but the invention is not limited to the circuit structure, and the third capacitor C22 and the second feedback inductor L22 may be connected in parallel.
The signal detection unit 300 may further be configured to detect a second electrical signal on the second excitation unit 101 for measuring a second mutual inductance. The second electric signal in the invention is a voltage signal or a current signal I21. In order to simplify the circuit structure, the present invention still takes the voltage signal detection as an example. The signal detection unit 300 in fig. 2 may include a diode D1, a resistor R1, and a resistor R2 connected in series, and the entire signal detection unit 300 may be connected in parallel with the inverter AC and the resonant capacitor C11. The present embodiment may use the voltage signal between the resistor R1 and the resistor R2 as the second voltage signal.
The result generation unit 400 may also be used to determine the distance to be measured from the second electrical signal. It can be understood that, the relationship between the second electrical signal and the distance to be measured, the invention can form a relationship table by the corresponding relationship between the voltage value and the distance value in a product test mode, and store the relationship table in the household appliance chip, and when the corresponding voltage value U is detectedtdThen, the corresponding distance value d (the distance to be detected) can be detected by a table lookup manner, so as to realize the function of detecting the distance between the second excitation unit 101 and the second feedback unit 201. Alternatively, the invention may also be implemented to establish a functional relationship between the voltage value and the distance value, e.g. d ═ f2(Utd). The corresponding voltage value U can be detectedtdAnd then, directly determining the distance value d by means of function calculation. F for different household appliances or different appliance parameters2(x) The present invention is not described in detail, which is often different.
It can be understood that the parameter ranges of the first inductor L11, the first feedback inductor L12, the second inductor L21 and the second feedback inductor L22 in the present invention may all be 5uH to 100uH, the parameter ranges of the resonant capacitor C11, the second capacitor C12 and the third capacitor C22 may all be 10nF to 500nF, and the parameter range of the thermistor R12 may be 0 to 100K Ω. The frequency range of the alternating current signal generated by the inverter AC is 10KHz to 1MHz, and for example, 50KHz to 300KHz may be preferable.
It should be understood that the temperature measuring device and the distance measuring device provided by the present invention can be used separately. The invention can provide a device integrating the temperature measurement function and the distance measurement function, and can also provide a non-contact temperature measurement device or a non-contact distance measurement device independently.
As shown in fig. 3, the first inductor L11 and the second inductor L21 are located on the same plane. The first inductor L11, the first feedback inductor L12, the second inductor L21 and the second feedback inductor L22 provided by the invention can be a PCB etched coil structure, and certainly, a metal sheet structure can be used for reducing the cost.
It will be appreciated that the present invention can provide a domestic appliance including, but not limited to, a non-contact measuring device in any embodiment of the invention. Wherein the household appliances comprise at least one of electric baking pan, pressure cooker, electric cooker and other household appliances.
As shown in FIG. 4, for the electric baking pan as an example, the non-contact measuring device may include a first exciting unit and a second exciting unit disposed on the bottom plate of the electric baking pan, and a first feedback unit and a second feedback unit disposed on the cover of the electric baking pan. Specifically, the first inductor L11 and the second inductor L21 are both disposed on the bottom plate of the electric baking pan, and the first feedback inductor L12 and the second feedback inductor L22 are both disposed on the cover of the electric baking pan. The first inductor L11 and the first feedback inductor L12 are disposed opposite to each other in the vertical direction, and the second inductor L21 and the second feedback inductor L22 are disposed opposite to each other in the vertical direction. When the cover of the electric baking pan and the bottom plate of the electric baking pan are close to or far away from each other, the invention can determine the distance between the bottom plate and the cover (namely the thickness of food in the electric baking pan) and the temperature on the cover (the temperature of the upper surface of the food in the electric baking pan) by only detecting the voltage value.
As shown in fig. 5, taking a pressure cooker as an example, the non-contact measuring device may include a first exciting unit and a second exciting unit disposed on a body of the pressure cooker, and a first feedback unit and a second feedback unit disposed on a cover of the pressure cooker. Specifically, the first inductor L11 and the second inductor L21 are both disposed on the pressure cooker body, and the first feedback inductor L12 and the second feedback inductor L22 are both disposed on the pressure cooker cover. After the pressure cooker is pressurized, the pressure cooker cover drives the first feedback inductor L12 and the second feedback inductor L22 to be away from the inductor L11 and the second inductor L21 respectively.
As shown in fig. 6, and may be combined with fig. 2, the present invention can provide a non-contact measuring method for a home appliance based on the same inventive concept as the above-mentioned non-contact measuring device. The non-contact measurement method may include, but is not limited to, at least one of the following steps.
And 10, detecting a second electric signal for measuring second mutual inductance on the second excitation unit 101. The second excitation unit 101 is used for generating second mutual inductance with the second feedback unit 201, a distance to be measured is arranged between the second feedback unit 201 and the second excitation unit 101, and the distance to be measured and the second mutual inductance are in negative correlation.
And step 20, determining the distance to be measured according to the second electric signal. The distance measuring function of the invention is realized by utilizing the relationship among the second electric signal, the second mutual inductance and the distance to be measured.
Step 30, detecting a first electric signal for measuring first mutual inductance on the first excitation unit 100; the first exciting unit 100 is configured to generate a first mutual inductance with the first feedback unit 200, and the first feedback unit 200 has a thermistor R12, and the first mutual inductance varies with a resistance of the thermistor R12.
And step 40, determining the temperature of the environment where the thermistor is located according to the first electric signal. Namely, the relation between the first electric signal, the first mutual inductance, the resistance value of the thermistor and the temperature is utilized to realize the temperature measuring function of the temperature measuring device.
The invention is carried out after the distance measurement is carried outDuring temperature measurement, a plurality of voltage-temperature relation tables (or functions T ═ f) can be arranged in the household appliance chip in advance1(Utd) Different voltage-temperature dependence tables (or functions T ═ f)1(Utd) Corresponding to different distances d. That is, in step 40, a corresponding voltage-temperature relationship table (or function T ═ f) is called according to the current distance d (the distance to be measured)1(Utd) Then the voltage-temperature relationship table (or function T ═ f) is used1(Utd) As a basis for determining the temperature of the environment in which the thermistor is located.
As shown in fig. 7, the non-contact measuring method for the home appliance may be performed as follows.
After the measurement is started, the distance between the second feedback unit 201 and the second excitation unit 101, specifically, the distance between the second inductor L21 and the second feedback inductor L22, both of which are coil-shaped, is measured. Reading the stable voltage U when measuring the distancetdAnd data, determining the current distance d according to the read data, and then determining a next cooking level by a household appliance controller or a user person according to the distance d, wherein the next cooking level is adjusted in power, changed in cooking time and the like.
After the distance d to be measured is determined, the present embodiment performs temperature measurement under the condition of the distance d. Reading the stabilized voltage U againtdAnd determining a temperature T from the read data and then determining a next cooking level from the temperature T, e.g. the home appliance controller determining the next cooking level from the temperature T, or the user manually determining the next cooking level from the temperature T, the next cooking level being e.g. adjusting power, changing cooking time, etc.
After the current measurement process is completed, the present embodiment may restart the next measurement process, or directly end the measurement process without temperature measurement and distance measurement.
The present invention can also provide a computer storage medium having computer-readable instructions stored thereon that, when executed by one or more processors, cause the one or more processors to perform a method of contactless measurement in any of the embodiments of the present invention. The non-contact measurement method may include, but is not limited to, at least one of the following steps. And 10, detecting a second electric signal for measuring second mutual inductance on the second excitation unit 101. The second excitation unit 101 is used for generating second mutual inductance with the second feedback unit 201, a distance to be measured is arranged between the second feedback unit 201 and the second excitation unit 101, and the distance to be measured and the second mutual inductance are in negative correlation. And step 20, determining the distance to be measured according to the second electric signal. The distance measuring function of the invention is realized by utilizing the relationship among the second electric signal, the second mutual inductance and the distance to be measured. Step 30, detecting a first electric signal for measuring first mutual inductance on the first excitation unit 100; the first exciting unit 100 is configured to generate a first mutual inductance with the first feedback unit 200, and the first feedback unit 200 has a thermistor R12, and the first mutual inductance varies with a resistance of the thermistor R12. And step 40, determining the temperature of the environment where the thermistor is located according to the first electric signal. Namely, the relation between the first electric signal, the first mutual inductance, the resistance value of the thermistor and the temperature is utilized to realize the temperature measuring function of the temperature measuring device.
The logic and/or steps represented in the flowcharts or otherwise described herein, such as an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable storage medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable storage medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer cartridge (magnetic device), a Random Access Memory (RAM), a Read-Only Memory (ROM), an Erasable Programmable Read-Only Memory (EPROM-Only Memory, or flash Memory), an optical fiber device, and a portable Compact Disc Read-Only Memory (CDROM). Additionally, the computer-readable storage medium may even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following technologies, which are well known in the art, may be used: a discrete logic circuit having a logic Gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic Gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description herein, references to the description of the term "the present embodiment," "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., and "plurality" means at least two, such as two, three, etc., unless specifically limited otherwise.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. A non-contact measuring device for household appliances, characterized in that it comprises:
a first excitation unit for generating a first excitation signal;
the first feedback unit is used for generating first mutual inductance with the first excitation unit under the action of the first excitation signal; the first feedback unit is provided with a thermistor, and the first mutual inductance is changed along with the change of the resistance value of the thermistor;
the signal detection unit is used for detecting a first electric signal which is arranged on the first excitation unit and used for measuring the first mutual inductance;
and the result generating unit is used for determining the temperature of the environment where the thermistor is positioned according to the first electric signal.
2. The non-contact measuring device for household appliances according to claim 1, characterized by further comprising:
a second excitation unit for generating a second excitation signal;
the second feedback unit is used for generating second mutual inductance with the second excitation unit under the action of the second excitation signal; the second feedback unit and the second excitation unit have a distance to be measured, and the distance to be measured is in negative correlation with the second mutual inductance; the signal detection unit is further used for detecting a second electric signal on the second excitation unit for measuring the second mutual inductance, and the result generation unit is further used for determining the distance to be measured according to the second electric signal.
3. The non-contact measuring device for home appliances according to claim 2,
the second excitation unit shares an inverter with the first excitation unit and a resonance capacitor connected in series with the inverter; the inverter is configured to generate an ac signal that is used to form the first excitation signal or the second excitation signal.
4. The non-contact measuring device for home appliances according to claim 3,
the first excitation unit comprises a first inductor and a first state switching module which are connected with the inverter in series; the first state switching module is used for controlling whether the first excitation unit generates a first excitation signal or not, and the first inductor is used for sending out the first excitation signal;
the second excitation unit comprises a second inductor and a second state switching module which are connected with the inverter in series; the second state switching module is used for controlling whether the second excitation unit generates a second excitation signal or not, and the second inductor is used for sending out the second excitation signal.
5. The non-contact measuring device for home appliances according to claim 4,
the first inductor and the second inductor are positioned on the same plane.
6. The non-contact measuring device for home appliances according to claim 2,
the first electric signal is a voltage signal or a current signal;
the second electrical signal is a voltage signal or a current signal.
7. A domestic appliance, characterized in that it comprises a non-contact measuring device according to any one of claims 1 to 6.
8. A non-contact measuring method for a household appliance, characterized in that it comprises:
detecting a first electric signal used for measuring first mutual inductance on the first excitation unit; the first excitation unit is used for generating first mutual inductance with the first feedback unit, the first feedback unit is provided with a thermistor, and the first mutual inductance is changed along with the change of the resistance value of the thermistor;
and determining the temperature of the environment where the thermistor is located according to the first electric signal.
9. The non-contact measuring method for home appliances according to claim 8, wherein the detecting the first electric signal for measuring the first mutual inductance on the first exciting unit further comprises:
detecting a second electric signal used for measuring second mutual inductance on a second excitation unit; the second excitation unit is used for generating second mutual inductance with a second feedback unit, a distance to be measured is arranged between the second feedback unit and the second excitation unit, and the distance to be measured and the second mutual inductance are in negative correlation;
determining the distance to be measured from the second electrical signal.
10. A computer storage medium having computer-readable instructions stored thereon, which, when executed by one or more processors, cause the one or more processors to perform the contactless measurement method of any one of claims 8 or 9.
CN202011497247.0A 2020-12-17 2020-12-17 Non-contact measuring device and method for household appliance, appliance and medium Pending CN114642352A (en)

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CN102539005A (en) * 2011-12-26 2012-07-04 浙江大学 Coupling-based non-contact temperature measurement system and coupling-based non-contact temperature measurement method
CN104154852A (en) * 2014-08-20 2014-11-19 中国科学技术大学 Conductive film thickness measurement system based on eddy current sensor and method thereof
CN104949605A (en) * 2014-03-31 2015-09-30 通用电气公司 Position detection module, position detection system and method thereof
CN111174856A (en) * 2018-11-12 2020-05-19 杭州为峰智能科技有限公司 Rotation detection device
CN111355311A (en) * 2018-12-20 2020-06-30 台达电子工业股份有限公司 Distance detection method and system for wireless power transmission device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102539005A (en) * 2011-12-26 2012-07-04 浙江大学 Coupling-based non-contact temperature measurement system and coupling-based non-contact temperature measurement method
CN104949605A (en) * 2014-03-31 2015-09-30 通用电气公司 Position detection module, position detection system and method thereof
CN104154852A (en) * 2014-08-20 2014-11-19 中国科学技术大学 Conductive film thickness measurement system based on eddy current sensor and method thereof
CN111174856A (en) * 2018-11-12 2020-05-19 杭州为峰智能科技有限公司 Rotation detection device
CN111355311A (en) * 2018-12-20 2020-06-30 台达电子工业股份有限公司 Distance detection method and system for wireless power transmission device

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