CN212030772U - Temperature measurement circuit and cooking device - Google Patents
Temperature measurement circuit and cooking device Download PDFInfo
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- CN212030772U CN212030772U CN202020780864.0U CN202020780864U CN212030772U CN 212030772 U CN212030772 U CN 212030772U CN 202020780864 U CN202020780864 U CN 202020780864U CN 212030772 U CN212030772 U CN 212030772U
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Abstract
The application discloses temperature measurement circuit and culinary art device, temperature measurement circuit includes: the temperature measuring unit is connected with a power supply and an excitation power supply at the input end, is used for inputting a power supply signal and an excitation signal, and is excited by the excitation signal to generate a temperature measuring signal when the excitation signal is smaller than an excitation threshold value; when the excitation signal is smaller than the excitation threshold value, the power supply signal is in a zero-crossing range, and the zero-crossing range takes a zero-crossing point as a center; the input end of the trigger unit is connected with the power supply and/or the excitation power supply, and is used for inputting a power supply signal and/or an excitation signal and generating a trigger signal based on the power supply signal and/or the excitation signal; and the input end of the processing unit is connected with the output end of the trigger unit, and the starting time for acquiring the temperature measurement signal is determined according to the trigger signal and corresponds to the zero-crossing point. By utilizing the temperature measuring circuit, temperature measuring signals can be collected at accurate excitation time points.
Description
Technical Field
The application relates to the field of household appliances, in particular to a temperature measuring circuit and a cooking device.
Background
Electromagnetic heating cookers such as induction cookers, electric rice cookers, electric pressure cookers and the like are novel cookers which utilize the electromagnetic induction heating principle to carry out eddy current heating on cookers, have the advantages of high thermal efficiency, convenient use, no gas combustion pollution, safety, sanitation and the like, and are very suitable for modern families.
At present, indirect temperature measurement can be carried out on a cookware through a temperature measurement system of an electromagnetic heating cooker, the temperature measurement system needs to collect temperature measurement signals to measure the temperature, and the collection time of the temperature measurement signals is inaccurate, so that inaccurate temperature measurement is easily caused.
SUMMERY OF THE UTILITY MODEL
The application provides a temperature measurement circuit and culinary art device to solve the inaccurate problem of temperature measurement time.
In order to solve the above technical problem, the present application provides a temperature measurement circuit, the temperature measurement circuit includes: the temperature measuring unit is connected with a power supply and an excitation power supply at the input end, is used for inputting a power supply signal and an excitation signal, and is excited by the excitation signal to generate a temperature measuring signal when the excitation signal is smaller than an excitation threshold value; when the excitation signal is smaller than an excitation threshold value, the power supply signal is in a zero-crossing range, and the zero-crossing range takes a zero-crossing point as a center; the input end of the trigger unit is connected with the power supply and/or the excitation power supply, and is used for inputting the power supply signal and/or the excitation signal and generating a trigger signal based on the power supply signal and/or the excitation signal; and the input end of the processing unit is connected with the output end of the trigger unit, and the starting time for acquiring the temperature measurement signal is determined according to the trigger signal, wherein the starting time corresponds to the zero-crossing point.
The trigger unit comprises a zero-crossing circuit, the zero-crossing circuit is connected between the power supply and the processing unit and used for inputting the power supply signal, the zero-crossing circuit comprises a double-edge interrupt comparator, and a zero-crossing signal output by the double-edge interrupt comparator is used as the trigger signal; the zero-crossing signal is a square wave signal; the input end of the processing unit is connected with the output end of the double-edge interrupt comparator so as to acquire the lower edge interrupt time of the previous square wave and the upper edge interrupt time of the next square wave in the zero-crossing signal, and the starting time is determined based on the upper edge interrupt time and the lower edge interrupt time.
The processing unit takes the intermediate time between the upper edge interrupt time and the lower edge interrupt time as the time of a zero crossing point, and takes the time of delaying the time of the zero crossing point by a first time as the starting time.
The trigger unit comprises a comparator, wherein a first input end of the comparator is connected with an excitation power supply and used for inputting an excitation signal, a second input end of the comparator is connected with a threshold power supply and used for inputting the excitation threshold, an output end of the comparator is connected with an input end of the processing unit, and a comparison signal is output as the trigger signal; the comparison signal is a square wave signal, wherein the square wave indicates that the excitation signal is smaller than the excitation threshold; the processing unit takes the interruption time of the upper edge of the square wave in the comparison signal as the starting time.
The trigger unit comprises a triode, the base electrode of the triode is connected with the power supply and inputs the power supply signal, the emitter electrode of the triode is connected with the excitation power supply and inputs the excitation signal, and the collector electrode of the triode is connected with the input end of the processing unit and outputs the trigger signal; the trigger signal is a square wave signal, wherein the square wave represents that the power supply signal is smaller than the excitation signal; the processing unit takes the interruption time of the upper edge of the square wave in the trigger signal as the starting time.
And the processing unit further takes the time after the upper edge interruption time is delayed by a second time as the starting time.
And the processing unit determines that the end time of acquiring the temperature measurement signal is the time after the start time is delayed by a third time.
Wherein the third time is 10 us-2 ms.
Wherein the excitation signal is between 5V and 50V.
In order to solve the technical problem, the application provides a cooking device, the cooking device includes above-mentioned temperature measurement circuit.
The temperature measuring circuit comprises a temperature measuring unit, a triggering unit and a processing unit, wherein the temperature measuring unit is powered by a power supply signal and is excited by an excitation signal to measure temperature, the excitation signal and the power supply signal have a certain relation, namely when the excitation signal is smaller than an excitation threshold value and the temperature measuring unit is excited, the power supply signal is in a zero-crossing range; the time equivalent to the time of generating the temperature measurement signal, namely the acquisition time can be obtained by the power supply signal and the excitation signal, and the power supply signal and the excitation signal are inconvenient to detect; therefore, the trigger unit is used for generating a trigger signal based on the power supply signal and/or the excitation signal, and the trigger signal is detected by the processing unit, so that the acquisition starting moment of the temperature measurement signal is determined. This application is through setting up the trigger unit to make temperature measurement signal detection time more accurate, then the temperature measurement result also can be more accurate.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic structural diagram of a temperature measuring circuit according to a first embodiment of the present application;
FIG. 2 is a schematic diagram of the relationship between the power supply signal and the excitation signal in the first embodiment of the thermometry circuit of FIG. 1;
FIG. 3 is a schematic structural diagram of a second embodiment of a temperature measuring circuit according to the present application;
FIG. 4 is a schematic diagram of the relationship between the supply signal and the zero crossing signal in the second embodiment of the temperature sensing circuit of FIG. 3;
FIG. 5 is a schematic diagram of a portion of a third embodiment of a temperature measuring circuit according to the present application;
FIG. 6 is a schematic diagram of a comparison signal in the third embodiment of the thermometry circuit of FIG. 5;
FIG. 7 is a schematic diagram of a portion of a fourth embodiment of a temperature measuring circuit according to the present application;
FIG. 8 is a schematic diagram of a trigger signal in a fourth embodiment of the thermometry circuit of FIG. 7;
fig. 9 is a schematic structural diagram of an embodiment of a cooking device according to the present application.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present application, the following describes a temperature measuring circuit and a cooking device provided in the present application in further detail with reference to the accompanying drawings and the detailed description.
Referring to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of a first embodiment of a temperature measuring circuit of the present application, and fig. 2 is a schematic relationship diagram of a power supply signal and an excitation signal in the first embodiment of the temperature measuring circuit shown in fig. 1. The temperature measuring circuit 100 of the first embodiment of the present application includes a temperature measuring unit 11, a trigger unit 12, and a processing unit 13.
The input end of the temperature measuring unit 11 is connected with a power supply and an excitation power supply to input a power supply signal VAC and an excitation signal VSS, and the power supply signal VAC and the excitation signal VSS are used for being excited by the excitation signal VSS to generate a temperature measuring signal VAB when the excitation signal VSS is smaller than an excitation threshold value VSS 1; when the excitation signal VSS is smaller than the excitation threshold VSS1, the power supply signal VAC is within a zero-crossing range W centered at a zero-crossing point Z.
The power supply signal VAC realizes power supply of the whole circuit, in this embodiment, the power supply signal VAC is 220V commercial power alternating current, and the temperature measurement circuit 100 may include an operating time period, such as a heating time period, and a temperature measurement time period. In order to avoid influencing normal operation, the temperature measurement time period is selected within a zero-crossing range W of the power supply signal VAC, the zero-crossing range W takes a zero-crossing point Z as a center, that is, when the power supply signal is small and has no influence on the working effect, for example, when the power supply signal is small and basically has no effect on the heating effect, temperature measurement is performed, and the corresponding temperature measurement unit 11 also generates a temperature measurement signal VAB in the temperature measurement time period.
In this embodiment, the temperature measurement time period is controlled by the excitation signal VSS corresponding to the power supply signal VAC, specifically, the temperature measurement unit 11 of this embodiment may be excited to generate the temperature measurement signal VAB when the excitation signal VSS is smaller than the excitation threshold VSS1, and a range where the excitation signal VSS is smaller than the excitation threshold VSS1 corresponds to the zero-crossing range W. The period of the driving signal VSS is half of the period of the power supply signal VAC, and in this embodiment, the driving signal VSS is set to 5V to 50V, and the driving signal VSS smaller than 50V does not affect the function of the power supply signal VAC.
The purpose of this embodiment is to obtain the accurate start time of collecting the temperature measurement signal, so that the temperature measurement is more accurate. As is apparent from the above description of the temperature measuring unit 11, the generation of the temperature measuring signal VAB corresponds to the zero-crossing range of the power supply signal VAC and also corresponds to the excitation signal VSS being smaller than the excitation threshold VSS1, and thus the start time of acquiring the temperature measuring signal VAB can be obtained by detecting the power supply signal VAC or the excitation signal VSS.
Since it is not easy to directly detect the power supply signal VAC or the excitation signal VSS, the trigger unit 12 is introduced in the present embodiment, and an input terminal thereof is connected to the power supply and/or the excitation power source to input the power supply signal VAC and/or the excitation signal VSS, and the trigger signal is generated based on the power supply signal VAC and/or the excitation signal VSS. The trigger unit 12 functions to convert the power supply signal VAC or the excitation signal VSS for easier measurement.
The processing unit 13 of this embodiment is connected to the trigger unit 12 to obtain a trigger signal, and determines a start time TA of acquiring the temperature measurement signal VAB according to the trigger signal, where the start time TAB corresponds to the zero crossing point Z.
In this embodiment, the trigger unit 12 is arranged, so that the acquisition time of the temperature measurement signal VAB is more accurate, and then the temperature measurement result is also more accurate.
The processing unit 13 further determines the ending time TB of collecting the temperature measurement signal VAB as the time after the starting time TA is delayed by a third time T3. The third time T3 depends on the frequency of the power supply signal VAC, which is 50Hz in this embodiment, and T3 is selected to be 10 us-2 ms.
As can be seen from the above description, the key point of this embodiment is that the trigger unit 12 converts the power supply signal VAC and/or the excitation signal VSS into a trigger signal for measurement. The specific circuit structure of the trigger unit 12 is described by the following embodiments, but is not limited to the following embodiments, and other circuit structures capable of achieving accurate time detection may be applied to the present application.
Referring to fig. 3 and 4, fig. 3 is a schematic structural diagram of a temperature measuring circuit according to a second embodiment of the present application, and fig. 4 is a schematic structural diagram of a relationship between a power supply signal and a zero crossing signal in the second embodiment of the temperature measuring circuit shown in fig. 3. The temperature measuring circuit 200 of the second embodiment of the present application has substantially the same structure as the temperature measuring circuit 100 of the first embodiment, and also includes a temperature measuring unit 21, a trigger unit 22, and a processing unit 23. The difference is mainly the trigger unit 22 and the processing unit 23.
The trigger unit 22 in this embodiment includes a ZERO-crossing circuit, in which a power supply signal VAC is input and a ZERO-crossing signal ZERO is output as a trigger signal; the ZERO-crossing signal ZERO is a square wave signal.
The comparator in the ZERO-crossing circuit is a double-edge interrupt comparator, and thus can generate a double-edge interrupt signal, so that the processing unit 23 can acquire the lower edge interrupt time a of the previous square wave and the upper edge interrupt time B of the next square wave in the ZERO-crossing signal ZERO, and determine the start time TA based on the lower edge interrupt time a and the upper edge interrupt time B. Specifically, the intermediate time between the bottom edge interrupt time a and the top edge interrupt time B is the time of the zero-crossing point Z, and the time after delaying the time of the zero-crossing point Z by the first time T1 is the start time TA.
Specifically, the trigger unit 22 includes a first comparator CMP1, a first diode D2, and a second diode D3. The first comparator CMP1 is a double-edge interrupt comparator.
The positive input end of the first comparator CMP1 is connected to the output end of the first diode D2 and the output end of the second diode D3, the input end of the first diode D2 is connected to the first electrode L of the power supply signal VAC signal source, and the input end of the second diode D3 is connected to the second electrode N of the power supply signal VAC signal source, so that the power supply signal VAC input to the positive input end of the first comparator CMP1 is a forward signal.
The negative input of the first comparator CMP1 receives a reference signal Vref, and the output outputs a ZERO crossing signal ZERO, the square wave of which indicates that the supply signal VAC is greater than the reference signal Vref. Thus, the time between the falling edge interrupt time a and the rising edge interrupt time B corresponds to the zero-crossing range W, and the time between the falling edge interrupt time a and the rising edge interrupt time B, i.e., the time representing the zero-crossing point Z, is taken.
The trigger unit 22 of this embodiment generates a trigger signal according to the power supply signal VAC, generates a square wave in the trigger signal outside the zero-crossing range, and determines the zero-crossing point Z according to the edge terminal by detecting the edge interruption of the square wave, thereby determining the acquisition start time TA.
Referring to fig. 5 and 6, fig. 5 is a schematic diagram of a partial structure of a third embodiment of a temperature measuring circuit according to the present application, and fig. 6 is a schematic diagram of a comparison signal in the third embodiment of the temperature measuring circuit shown in fig. 5. The temperature measuring circuit of the third embodiment of the present application includes a temperature measuring unit, a triggering unit 32, and a processing unit.
The trigger unit 32 includes a second comparator CMP2, a positive input terminal of the comparator CMP2 is connected to a threshold power supply to input the driving threshold VSS1, a negative input terminal thereof inputs the driving signal VSS, an output terminal thereof outputs the comparison signal VSS _ INT as a trigger signal, and the comparison signal VSS _ INT is a square wave signal, wherein the square wave indicates that the driving signal is smaller than the driving threshold. Other comparators opposite to the second comparator CMP2 may be provided based on this principle.
The processing unit takes the interruption time of the upper edge of the square wave in the comparison signal VSS _ INT as the starting time TA.
The trigger unit 32 of the present embodiment generates a trigger signal according to the excitation signal VSS, generates a square wave when the excitation signal VSS is smaller than the excitation threshold VSS1, and determines the acquisition start time TA by detecting an edge interrupt of the square wave.
Referring to fig. 7 and 8, fig. 7 is a schematic diagram of a partial structure of a fourth embodiment of a temperature measuring circuit of the present application, and fig. 8 is a schematic diagram of a trigger signal in the fourth embodiment of the temperature measuring circuit shown in fig. 7. The temperature measuring circuit of the fourth embodiment of the present application includes a temperature measuring unit, a triggering unit 42, and a processing unit.
The trigger unit 42 includes a transistor Q1, a power supply signal VAC is input to a base of the transistor Q1, the transistor Q1 is specifically connected to a second electrode N of a signal source of the power supply signal VAC, an excitation signal VSS is input to an emitter, a trigger signal VSS _ INT is output from a collector, the trigger signal VSS _ INT is a square wave signal, and the square wave indicates that the power supply signal VAC is smaller than the excitation signal VSS.
The processing unit takes the interruption time of the upper edge of the square wave in the trigger signal as the starting time TA. Since the base of the triode Q1 is connected to only one electrode of the VAC signal source, when the power supply signal VAC crosses zero from positive to negative, a square wave appears, and when the power supply signal VAC crosses zero from negative to positive, no new square wave appears, so that the start time in the zero crossing range from negative to positive is obtained by the delay calculation, i.e., the time after the upper edge interrupt time is delayed by the second time T2 is taken as the start time TA1 by the processing unit.
In this embodiment, half-wave triggering is performed, and a half period is separated between TA1 and TA, for example, if the frequency of the power supply signal VAC is 50Hz, TA1-TA is 10ms, and similarly, T2+ T3 is 10 ms.
The trigger unit of the embodiment generates the trigger signal according to the relationship between the power supply signal VAC and the excitation signal VSS, generates the square wave when the power supply signal VAC is smaller than the excitation signal VSS, and determines the acquisition start time TA by detecting the edge interruption of the square wave.
According to the embodiment, the acquisition time of the temperature measurement signal is determined by generating the trigger signal with better detection, so that the acquisition time is more accurate, and the corresponding temperature measurement result is more accurate. In addition, the circuit structures of the above third and fourth embodiments can be connected to the circuit structure of the second embodiment.
Referring to fig. 9, fig. 9 is a schematic structural diagram of an embodiment of a cooking device according to the present application. The cooking apparatus 500 includes a temperature measuring circuit 51, wherein the temperature measuring circuit 51 has the same structure as that of any one of the above embodiments, and the specific structure thereof can be found in the above embodiments and is not described herein again.
The cooking device 500 may be an induction cooker, an electric cooker, or an electric pressure cooker, and will not be described herein.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (10)
1. A temperature measurement circuit, the temperature measurement circuit comprising:
the temperature measuring unit is connected with a power supply and an excitation power supply at the input end, is used for inputting a power supply signal and an excitation signal, and is excited by the excitation signal to generate a temperature measuring signal when the excitation signal is smaller than an excitation threshold value; when the excitation signal is smaller than an excitation threshold value, the power supply signal is in a zero-crossing range, and the zero-crossing range takes a zero-crossing point as a center;
the input end of the trigger unit is connected with the power supply and/or the excitation power supply, and is used for inputting the power supply signal and/or the excitation signal and generating a trigger signal based on the power supply signal and/or the excitation signal;
the input end of the processing unit is connected with the output end of the trigger unit, and the starting time for acquiring the temperature measuring signal is determined according to the trigger signal, wherein the starting time corresponds to the zero-crossing point.
2. The circuit according to claim 1, wherein the trigger unit comprises a zero-crossing circuit, the zero-crossing circuit is connected between the power supply and the processing unit and is used for inputting the power supply signal, the zero-crossing circuit comprises a dual-edge interrupt comparator, and a zero-crossing signal output by the dual-edge interrupt comparator is used as the trigger signal; the zero-crossing signal is a square wave signal;
the input end of the processing unit is connected with the output end of the double-edge interrupt comparator so as to acquire the lower edge interrupt time of the previous square wave and the upper edge interrupt time of the next square wave in the zero-crossing signal, and the starting time is determined based on the upper edge interrupt time and the lower edge interrupt time.
3. The circuit according to claim 2, wherein the processing unit takes an intermediate time between a top edge interrupt time and a bottom edge interrupt time as a time of a zero-crossing point, and takes a time at which the time of the zero-crossing point is delayed by a first time as the start time.
4. The circuit of claim 1, wherein the trigger unit comprises a comparator, a first input terminal of the comparator is connected to an excitation power supply for inputting an excitation signal, a second input terminal of the comparator is connected to a threshold power supply for inputting the excitation threshold, and an output terminal of the comparator is connected to an input terminal of the processing unit for outputting a comparison signal as the trigger signal; the comparison signal is a square wave signal, wherein the square wave indicates that the excitation signal is smaller than the excitation threshold;
the processing unit takes the interruption time of the upper edge of the square wave in the comparison signal as the starting time.
5. The circuit of claim 1, wherein the trigger unit comprises a transistor, a base of the transistor is connected to the power supply and inputs the power supply signal, an emitter of the transistor is connected to the excitation power supply and inputs the excitation signal, and a collector of the transistor is connected to the input of the processing unit and outputs the trigger signal; the trigger signal is a square wave signal, wherein the square wave represents that the power supply signal is smaller than the excitation signal;
the processing unit takes the interruption time of the upper edge of the square wave in the trigger signal as the starting time.
6. The circuit of claim 5, wherein the processing unit further takes a time after the upper edge interrupt time is delayed by a second time as the start time.
7. The circuit of claim 1, wherein the processing unit determines that the ending time of the acquisition of the thermometric signal is a time delayed by a third time from the starting time.
8. The circuit of claim 7, wherein the third time is 10us to 2 ms.
9. The circuit of claim 1, wherein the stimulus signal is between 5V and 50V.
10. A cooking device, characterized in that it comprises a thermometric circuit according to any one of claims 1-9.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020780864.0U CN212030772U (en) | 2020-05-12 | 2020-05-12 | Temperature measurement circuit and cooking device |
| KR1020227036261A KR20220156053A (en) | 2020-05-12 | 2021-05-12 | Heating circuit and cooking unit |
| PCT/CN2021/093222 WO2021228116A1 (en) | 2020-05-12 | 2021-05-12 | Heating circuit and cooking apparatus |
| EP21803438.7A EP4043846A4 (en) | 2020-05-12 | 2021-05-12 | Heating circuit and cooking apparatus |
| JP2022525546A JP7400096B2 (en) | 2020-05-12 | 2021-05-12 | Heating circuit and cooking utensils |
| JP2023206292A JP2024023567A (en) | 2020-05-12 | 2023-12-06 | Heating circuit and cooking apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020780864.0U CN212030772U (en) | 2020-05-12 | 2020-05-12 | Temperature measurement circuit and cooking device |
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| Publication Number | Publication Date |
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| CN212030772U true CN212030772U (en) | 2020-11-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020780864.0U Active CN212030772U (en) | 2020-05-12 | 2020-05-12 | Temperature measurement circuit and cooking device |
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| CN (1) | CN212030772U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021228116A1 (en) * | 2020-05-12 | 2021-11-18 | 佛山市顺德区美的电热电器制造有限公司 | Heating circuit and cooking apparatus |
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- 2020-05-12 CN CN202020780864.0U patent/CN212030772U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021228116A1 (en) * | 2020-05-12 | 2021-11-18 | 佛山市顺德区美的电热电器制造有限公司 | Heating circuit and cooking apparatus |
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