CN109392206B - Heating control method, heating control device and cooking appliance - Google Patents
Heating control method, heating control device and cooking appliance Download PDFInfo
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- CN109392206B CN109392206B CN201710671509.2A CN201710671509A CN109392206B CN 109392206 B CN109392206 B CN 109392206B CN 201710671509 A CN201710671509 A CN 201710671509A CN 109392206 B CN109392206 B CN 109392206B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
- H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
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Abstract
The invention provides a heating control method, a heating control device and a cooking appliance, wherein the heating control method comprises the following steps: after a heating instruction with a specified power value is obtained, an input analog voltage signal is detected; and determining a target duty ratio corresponding to any analog voltage signal under the specified power value according to the corresponding relation between the analog voltage signal and the target duty ratio under any specified power value. According to the technical scheme, the power stability is ensured without monitoring the voltage and the current in real time, so that the hardware structure of the heating control circuit is simplified, the cost is reduced, and the reliability of power control is improved.
Description
Technical Field
The invention relates to the technical field of heating control, in particular to a heating control method, a heating control device and a cooking appliance.
Background
In the related art, based on the development of IH (Induction Heating) technology, a variety of HI cooking appliances, such as an IH electric cooker, an IH Induction cooker, an HI electric kettle, an IH pressure cooker, etc., are produced, and in order to achieve constant power Heating, a voltage signal and a current signal need to be collected at the same time for real-time adjustment, specifically, a current sampling module and a voltage sampling module need to be arranged in a Heating control circuit, which at least includes the following technical defects:
(1) the hardware structure of the heating control circuit is complex, and the manufacturing cost is improved;
(2) not only does it require real-time calculation of the product of the current signal and the voltage signal to determine the real-time power, but the time synchronization characteristics of the current signal and the voltage signal are highly required, which may affect the reliability of the constant power heating process if they are out of synchronization.
Disclosure of Invention
The invention is based on at least one of the above technical problems, and provides a new heating control scheme, which adjusts the target duty ratio in real time through the corresponding relation between the analog voltage signal and the target duty ratio under any specified power value to ensure constant power heating, simplifies the hardware structure of the heating control circuit, and particularly does not need to be provided with a current sampling module, thereby reducing the manufacturing cost, and in addition, does not need to ensure the time synchronization between the voltage signal and the current signal, and improves the reliability of the heating control scheme.
In order to achieve the above object, a first aspect of the present invention provides a heating control method, including: after a heating instruction with a specified power value is obtained, an input analog voltage signal is detected; and determining a target duty ratio corresponding to any analog voltage signal under the specified power value according to the corresponding relation between the analog voltage signal and the target duty ratio under any specified power value.
In the technical scheme, the heating instruction carries a specified power value, the target duty ratio is adjusted in real time according to the input analog voltage signal through the corresponding relation between the analog voltage signal and the target duty ratio under any specified power value, and then the current signal does not need to be acquired, so that a corresponding current acquisition module does not need to be arranged, wherein the duty ratio refers to the duty ratio of PWM (Pulse Width Modulation), and the power stability is ensured without monitoring the voltage and the current in real time, so that the hardware structure of the heating control circuit is simplified, the cost is reduced, and the reliability of power control is improved.
When the corresponding relation is established, a power meter is arranged at the load input end of the heating control circuit, the power meter can directly read the real-time power value, namely after the specified power value is determined, after any analog voltage signal is obtained, the duty ratio is adjusted until the real-time power value of the power meter is equal to the specified power value, namely each specified power value corresponds to one group of corresponding relation tables, and each corresponding relation table comprises the one-to-one corresponding relation between the analog voltage signal and the target duty ratio.
In addition, as will be understood by those skilled in the art, the heating instruction includes at least one specified power value, and the duty ratio is positively correlated with the power value, the duty ratio is usually an on-off switch as a pulse control switch that controls the operating time (i.e., the effective heating time period) of the heating control circuit, and the pulse control switch may be a thyristor, a relay, or the like.
In the above technical solution, preferably, before acquiring the heating instruction with the specified power value, the method further includes: under any specified power value, acquiring an analog voltage signal to be tested; when an analog voltage signal to be tested is input, the duty ratio is controlled to be increased from zero to a target duty ratio so that the detected output power value is equal to the specified power value.
In the technical scheme, under any specified power value, the duty ratio is controlled to be increased from zero to a target duty ratio according to an analog voltage signal to be tested, so that the detected output power value is equal to the specified power value, the corresponding relation between the analog voltage signal and the target duty ratio is directly established without collecting a current signal, and the reliability of the heating control scheme is improved.
In the above technical solution, preferably, the heating control method further includes: converting an analog voltage signal to be tested into a corresponding digital voltage signal; storing a first corresponding relation between an analog voltage signal to be tested and a digital voltage signal and a second corresponding relation between the digital voltage signal and a target duty ratio, wherein the corresponding relations comprise the first corresponding relation and the second corresponding relation under any specified power value.
In the technical scheme, because the pulse modulation signal (output according to the target duty ratio) is generally generated by a controller such as a single chip microcomputer, a microprocessor or an embedded device, a first corresponding relation between the analog voltage signal and the digital voltage signal needs to be established first, a second corresponding relation between the digital voltage signal and the target duty ratio needs to be established continuously, the digital voltage signal is used as an input signal which can be identified by the controller, and the reliability of the heating control scheme is further improved due to low interference noise of the digital voltage signal.
The specific correspondence is shown in Table 1, wherein n is greater than or equal to 0 and u is1～u1+nFor analogue voltage signals, digital voltage signals U1～U1+nFor corresponding digital voltage signals, X1～X1+nFor corresponding target occupationSpace ratio, the three are in one-to-one correspondence.
Table 1 assignment of power values P1The first corresponding relation and the second corresponding relation are merged
| Analog voltage signal u (V) | Digital voltage signal U (V) | Target duty cycle X |
| u1 | U1 | X1 |
| u1+1 | U1+1 | X1+1 |
| u1+2 | U1+2 | X1+2 |
| ….. | ….. | ….. |
| u1+n | U1+n | X1+n |
In the foregoing technical solution, preferably, determining a target duty ratio corresponding to any analog voltage signal at any specified power value according to a corresponding relationship between the analog voltage signal at any specified power value and the target duty ratio includes: determining a digital voltage signal corresponding to the input analog voltage signal according to the first corresponding relation; and determining a target duty ratio corresponding to the input analog voltage signal according to the digital voltage signal and the second corresponding relation.
In the technical scheme, the indirect corresponding relation between the analog voltage signal and the target duty ratio is established through the digital analog signal, and the response speed is high and the reliability is high.
In the above technical solution, preferably, before acquiring the heating instruction with the specified power value, the method further includes: presetting an analog voltage signal range corresponding to any specified power value, wherein the input analog voltage signal belongs to the analog voltage signal range.
In the technical scheme, the safety of the heating control scheme is further improved by presetting the analog voltage signal range corresponding to any specified power value, specifically, if the input analog voltage signal belongs to the analog voltage signal range, the corresponding target duty ratio can be determined according to the corresponding relation, and if the input analog voltage signal does not belong to the analog voltage signal range, the output target duty ratio can be zero, that is, the heating control process is stopped, so as to reduce the hardware damage of the heating control circuit caused by voltage fluctuation.
According to an embodiment of the second aspect of the present invention, there is provided a heating control apparatus including: the receiving unit is used for detecting an input analog voltage signal after acquiring a heating instruction with a specified power value; and the determining unit is used for determining a target duty ratio corresponding to any analog voltage signal under the specified power value according to the corresponding relation between the analog voltage signal under any specified power value and the target duty ratio.
In the technical scheme, the heating instruction carries a specified power value, the target duty ratio is adjusted in real time according to the input analog voltage signal through the corresponding relation between the analog voltage signal and the target duty ratio under any specified power value, and then the current signal does not need to be acquired, so that a corresponding current acquisition module does not need to be arranged, wherein the duty ratio refers to the duty ratio of PWM (Pulse Width Modulation), and the power stability is ensured without monitoring the voltage and the current in real time, so that the hardware structure of the heating control circuit is simplified, the cost is reduced, and the reliability of power control is improved.
When the corresponding relation is established, a power meter is arranged at the load input end of the heating control circuit, the power meter can directly read the real-time power value, namely after the specified power value is determined, after any analog voltage signal is obtained, the duty ratio is adjusted until the real-time power value of the power meter is equal to the specified power value, namely each specified power value corresponds to one group of corresponding relation tables, and each corresponding relation table comprises the one-to-one corresponding relation between the analog voltage signal and the target duty ratio.
In addition, as will be understood by those skilled in the art, the heating instruction includes at least one specified power value, and the duty ratio is positively correlated with the power value, the duty ratio is usually an on-off switch as a pulse control switch that controls the operating time (i.e., the effective heating time period) of the heating control circuit, and the pulse control switch may be a thyristor, a relay, or the like.
In the foregoing technical solution, preferably, the receiving unit is further configured to: under any specified power value, acquiring an analog voltage signal to be tested; the heating control device further includes: and the control unit is used for controlling the duty ratio to be increased from zero to a target duty ratio when the analog voltage signal to be tested is input so as to enable the detected output power value to be equal to the specified power value.
In the technical scheme, under any specified power value, the duty ratio is controlled to be increased from zero to a target duty ratio according to an analog voltage signal to be tested, so that the detected output power value is equal to the specified power value, the corresponding relation between the analog voltage signal and the target duty ratio is directly established without collecting a current signal, and the reliability of the heating control scheme is improved.
In the above technical solution, preferably, the heating control device further includes: the analog-to-digital conversion unit is used for converting the analog voltage signal to be tested into a corresponding digital voltage signal; the storage unit is used for storing a first corresponding relation between an analog voltage signal to be tested and a digital voltage signal and a second corresponding relation between the digital voltage signal and a target duty ratio, wherein the corresponding relations comprise the first corresponding relation and the second corresponding relation under any specified power value.
In the technical scheme, because the pulse modulation signal (output according to the target duty ratio) is generally generated by a controller such as a single chip microcomputer, a microprocessor or an embedded device, a first corresponding relation between the analog voltage signal and the digital voltage signal needs to be established first, a second corresponding relation between the digital voltage signal and the target duty ratio needs to be established continuously, the digital voltage signal is used as an input signal which can be identified by the controller, and the reliability of the heating control scheme is further improved due to low interference noise of the digital voltage signal.
The specific correspondence is shown in Table 1, wherein n is greater than or equal to 0 and u is1～u1+nFor analogue voltage signals, digital voltage signals U1～U1+nFor corresponding digital voltage signals, X1～X1+nThe three are in one-to-one correspondence relationship for corresponding target duty ratios.
In the foregoing technical solution, preferably, the determining unit is further configured to: determining a digital voltage signal corresponding to the input analog voltage signal according to the first corresponding relation; the determination unit is further configured to: and determining a target duty ratio corresponding to the input analog voltage signal according to the digital voltage signal and the second corresponding relation.
In the technical scheme, the indirect corresponding relation between the analog voltage signal and the target duty ratio is established through the digital analog signal, and the response speed is high and the reliability is high.
In the above technical solution, preferably, the heating control device further includes: the preset unit is used for presetting an analog voltage signal range corresponding to any specified power value, wherein the input analog voltage signal belongs to the analog voltage signal range.
In the technical scheme, the safety of the heating control scheme is further improved by presetting the analog voltage signal range corresponding to any specified power value, specifically, if the input analog voltage signal belongs to the analog voltage signal range, the corresponding target duty ratio can be determined according to the corresponding relation, and if the input analog voltage signal does not belong to the analog voltage signal range, the output target duty ratio can be zero, that is, the heating control process is stopped, so as to reduce the hardware damage of the heating control circuit caused by voltage fluctuation.
According to an embodiment of the third aspect of the present invention, there is provided a cooking appliance including: a heating assembly; the output end of the heating control device is connected to the load input end of the heating assembly, and the input end of the heating control device is connected to the input end of the analog voltage signal.
In the technical scheme, the heating instruction carries the designated power value, the target duty ratio is adjusted in real time according to the input analog voltage signal through the corresponding relation between the analog voltage signal and the target duty ratio under any designated power value, and then the current signal does not need to be acquired.
In the above technical solution, preferably, the heating assembly of the cooking appliance includes an electromagnetic heating coil.
Advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 shows a schematic flow diagram of a heating control method according to an embodiment of the invention;
FIG. 2 shows a schematic block diagram of a heating control apparatus according to an embodiment of the present invention;
fig. 3 shows a schematic block diagram of a cooking appliance according to an embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Fig. 1 shows a schematic flow diagram of a heating control method according to an embodiment of the invention.
As shown in fig. 1, a heating control method according to an embodiment of the present invention includes: step S102, after a heating instruction with a specified power value is obtained, an input analog voltage signal is detected; step S104, according to the corresponding relation between the analog voltage signal and the target duty ratio under any specified power value, determining a target duty ratio corresponding to any analog voltage signal under the specified power value.
In the technical scheme, a heating instruction carries a specified power value, the target duty ratio is adjusted in real time according to an input analog voltage signal through the corresponding relation between the analog voltage signal and the target duty ratio under any specified power value, and further the current signal does not need to be acquired, so that a corresponding current acquisition module does not need to be arranged, wherein the duty ratio refers to a PWM (Pulse Width Modulation) duty ratio, and the voltage and the current do not need to be monitored in real time to ensure the power stability, thereby not only simplifying the hardware structure of the heating control circuit and reducing the cost, but also improving the reliability of power control, wherein when the corresponding relation is established, a power meter is arranged at the load input end of the heating control circuit, the power meter can directly read the real-time power value, namely after the specified power value is determined, after any analog voltage signal is acquired, and adjusting the duty ratio until the real-time power value of the power meter is equal to the specified power value, namely each specified power value corresponds to a group of corresponding relation tables, and each corresponding relation table comprises a one-to-one corresponding relation between the analog voltage signal and the target duty ratio.
In addition, as will be understood by those skilled in the art, the heating instruction includes at least one specified power value, and the duty ratio is positively correlated with the power value, the duty ratio is usually an on-off switch as a pulse control switch that controls the operating time (i.e., the effective heating time period) of the heating control circuit, and the pulse control switch may be a thyristor, a relay, or the like.
In the above technical solution, preferably, before acquiring the heating instruction with the specified power value, the method further includes: under any specified power value, acquiring an analog voltage signal to be tested; when an analog voltage signal to be tested is input, the duty ratio is controlled to be increased from zero to a target duty ratio so that the detected output power value is equal to the specified power value.
In the technical scheme, under any specified power value, the duty ratio is controlled to be increased from zero to a target duty ratio according to an analog voltage signal to be tested, so that the detected output power value is equal to the specified power value, the corresponding relation between the analog voltage signal and the target duty ratio is directly established without collecting a current signal, and the reliability of the heating control scheme is improved.
In the above technical solution, preferably, the heating control method further includes: converting an analog voltage signal to be tested into a corresponding digital voltage signal; storing a first corresponding relation between an analog voltage signal to be tested and a digital voltage signal and a second corresponding relation between the digital voltage signal and a target duty ratio, wherein the corresponding relations comprise the first corresponding relation and the second corresponding relation under any specified power value.
In the technical scheme, because the pulse modulation signal (output according to the target duty ratio) is generally generated by a controller such as a single chip microcomputer, a microprocessor or an embedded device, a first corresponding relation between the analog voltage signal and the digital voltage signal needs to be established first, a second corresponding relation between the digital voltage signal and the target duty ratio needs to be established continuously, the digital voltage signal is used as an input signal which can be identified by the controller, and the reliability of the heating control scheme is further improved due to low interference noise of the digital voltage signal.
In the foregoing technical solution, preferably, determining a target duty ratio corresponding to any analog voltage signal at any specified power value according to a corresponding relationship between the analog voltage signal at any specified power value and the target duty ratio includes: determining a digital voltage signal corresponding to the input analog voltage signal according to the first corresponding relation; and determining a target duty ratio corresponding to the input analog voltage signal according to the digital voltage signal and the second corresponding relation.
In the technical scheme, the indirect corresponding relation between the analog voltage signal and the target duty ratio is established through the digital analog signal, and the response speed is high and the reliability is high.
In the above technical solution, preferably, before acquiring the heating instruction with the specified power value, the method further includes: presetting an analog voltage signal range corresponding to any specified power value, wherein the input analog voltage signal belongs to the analog voltage signal range.
In the technical scheme, the safety of the heating control scheme is further improved by presetting the analog voltage signal range corresponding to any specified power value, specifically, if the input analog voltage signal belongs to the analog voltage signal range, the corresponding target duty ratio can be determined according to the corresponding relation, and if the input analog voltage signal does not belong to the analog voltage signal range, the output target duty ratio can be zero, that is, the heating control process is stopped, so as to reduce the hardware damage of the heating control circuit caused by voltage fluctuation.
Fig. 2 shows a schematic block diagram of a heating control device according to an embodiment of the invention.
As shown in fig. 2, a heating control apparatus 200 according to an embodiment of the present invention includes: a receiving unit 202, configured to detect an input analog voltage signal after acquiring a heating instruction with a specified power value; the determining unit 204 is configured to determine a target duty ratio corresponding to any analog voltage signal at any specified power value according to a corresponding relationship between the analog voltage signal at any specified power value and the target duty ratio.
In the technical scheme, the heating instruction carries the designated power value, the target duty ratio is adjusted in real time according to the input analog voltage signal through the corresponding relation between the analog voltage signal and the target duty ratio under any designated power value, and then the current signal does not need to be acquired, so that a corresponding current acquisition module does not need to be arranged, wherein the duty ratio means that the power stability is ensured without monitoring the voltage and the current in real time, the hardware structure of the heating control circuit is simplified, the cost is reduced, and the reliability of power control is improved.
When the corresponding relation is established, a power meter is arranged at the load input end of the heating control circuit, the power meter can directly read the real-time power value, namely after the specified power value is determined, after any analog voltage signal is obtained, the duty ratio is adjusted until the real-time power value of the power meter is equal to the specified power value, namely each specified power value corresponds to one group of corresponding relation tables, and each corresponding relation table comprises the one-to-one corresponding relation between the analog voltage signal and the target duty ratio.
In addition, as will be understood by those skilled in the art, the heating instruction includes at least one specified power value, and the duty ratio is positively correlated with the power value, the duty ratio is usually an on-off switch as a pulse control switch that controls the operating time (i.e., the effective heating time period) of the heating control circuit, and the pulse control switch may be a thyristor, a relay, or the like. In the above technical solution, preferably, the receiving unit 202 is further configured to: under any specified power value, acquiring an analog voltage signal to be tested; the heating control device 200 further includes: and the control unit 206 is configured to control the duty ratio to increase the target duty ratio from zero when the analog voltage signal to be tested is input, so that the detected output power value is equal to the specified power value.
In the technical scheme, under any specified power value, the duty ratio is controlled to be increased from zero to a target duty ratio according to an analog voltage signal to be tested, so that the detected output power value is equal to the specified power value, the corresponding relation between the analog voltage signal and the target duty ratio is directly established without collecting a current signal, and the reliability of the heating control scheme is improved.
In the above technical solution, preferably, the heating control device 200 further includes: an analog-to-digital conversion unit 208 for converting the analog voltage signal to be tested into a corresponding digital voltage signal; the storage unit 210 is configured to store a first corresponding relationship between an analog voltage signal to be tested and a digital voltage signal, and a second corresponding relationship between the digital voltage signal and a target duty ratio, where the corresponding relationships include the first corresponding relationship and the second corresponding relationship at any specified power value.
In the technical scheme, because the pulse modulation signal (output according to the target duty ratio) is generally generated by a controller such as a single chip microcomputer, a microprocessor or an embedded device, a first corresponding relationship between the analog voltage signal and the digital voltage signal needs to be established first, and a second corresponding relationship between the digital voltage signal and the target duty ratio needs to be established continuously. The digital voltage signal is used as an input signal which can be recognized by the controller, and the reliability of the heating control scheme is further improved due to low interference noise of the digital voltage signal.
In the foregoing technical solution, preferably, the determining unit 204 is further configured to: determining a digital voltage signal corresponding to the input analog voltage signal according to the first corresponding relation; the determining unit 204 is further configured to: and determining a target duty ratio corresponding to the input analog voltage signal according to the digital voltage signal and the second corresponding relation.
In the technical scheme, the digital voltage signal is used as an input signal which can be recognized by the controller, and the reliability of the heating control scheme is further improved due to the low interference noise of the digital voltage signal.
In the above technical solution, preferably, the heating control device 200 further includes: the presetting unit 212 is configured to preset an analog voltage signal range corresponding to any one of the designated power values, where the input analog voltage signal belongs to the analog voltage signal range.
In the technical scheme, the safety of the heating control scheme is further improved by presetting the analog voltage signal range corresponding to any specified power value, specifically, if the input analog voltage signal belongs to the analog voltage signal range, the corresponding target duty ratio can be determined according to the corresponding relation, and if the input analog voltage signal does not belong to the analog voltage signal range, the output target duty ratio can be zero, that is, the heating control process is stopped, so as to reduce the hardware damage of the heating control circuit caused by voltage fluctuation.
Fig. 3 shows a schematic block diagram of a cooking appliance according to an embodiment of the present invention.
As shown in fig. 3, a cooking appliance 300 according to an embodiment of the present invention includes: a heating assembly 302; the output of the heating control device 200 is connected to the load input of the heating element 302, and the input of the heating control device 200 is connected to the input of the analog voltage signal.
In the technical solution, after a heating instruction with a specified power value is performed, an analog voltage signal detected and input is converted into a digital voltage signal by an a/D converter, and a duty ratio of PWM is adjusted according to an output voltage signal, so that an actually output power value reaches the specified power, a heating assembly 302 is connected to an output end of the heating control device 200, and food is heated by the heating assembly 302 at the set power value.
In the above technical solution, preferably, the heating assembly 302 of the cooking appliance 300 includes an electromagnetic heating coil.
The receiving unit 202 of the heating control apparatus 200 may be a touch panel of the cooking appliance 300 or a wireless communication receiver, the determining unit 204 may be a controller of the cooking appliance 300, such as a microprocessor, a microcontroller, a single chip microcomputer, and the like, the control unit 206 may be a pulse generator of the cooking appliance 300, the analog-to-digital conversion unit 208 may be an a/D converter of the cooking appliance 300, and the storage unit 210 and the preset unit 212 may be a memory of the cooking appliance 300.
According to an embodiment of the present invention, there is also provided a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of: after a heating instruction with a specified power value is obtained, an input analog voltage signal is detected; and determining a target duty ratio corresponding to any analog voltage signal under the specified power value according to the corresponding relation between the analog voltage signal and the target duty ratio under any specified power value.
In the technical scheme, the heating instruction carries a specified power value, the target duty ratio is adjusted in real time according to the input analog voltage signal through the corresponding relation between the analog voltage signal and the target duty ratio under any specified power value, and then the current signal does not need to be acquired, so that a corresponding current acquisition module does not need to be arranged, wherein the duty ratio refers to the duty ratio of PWM (Pulse Width Modulation), and the power stability is ensured without monitoring the voltage and the current in real time, so that the hardware structure of the heating control circuit is simplified, the cost is reduced, and the reliability of power control is improved.
When the corresponding relation is established, a power meter is arranged at the load input end of the heating control circuit, the power meter can directly read the real-time power value, namely after the specified power value is determined, after any analog voltage signal is obtained, the duty ratio is adjusted until the real-time power value of the power meter is equal to the specified power value, namely each specified power value corresponds to one group of corresponding relation tables, and each corresponding relation table comprises the one-to-one corresponding relation between the analog voltage signal and the target duty ratio.
In addition, as will be understood by those skilled in the art, the heating instruction includes at least one specified power value, and the duty ratio is positively correlated with the power value, the duty ratio is usually an on-off switch as a pulse control switch that controls the operating time (i.e., the effective heating time period) of the heating control circuit, and the pulse control switch may be a thyristor, a relay, or the like.
In the above technical solution, preferably, before acquiring the heating instruction with the specified power value, the method further includes: under any specified power value, acquiring an analog voltage signal to be tested; when an analog voltage signal to be tested is input, the duty ratio is controlled to be increased from zero to a target duty ratio so that the detected output power value is equal to the specified power value.
In the technical scheme, under any specified power value, the duty ratio is controlled to be increased from zero to a target duty ratio according to an analog voltage signal to be tested, so that the detected output power value is equal to the specified power value, the corresponding relation between the analog voltage signal and the target duty ratio is directly established without collecting a current signal, and the reliability of the heating control scheme is improved.
In the above technical solution, preferably, the heating control method further includes: converting an analog voltage signal to be tested into a corresponding digital voltage signal; storing a first corresponding relation between an analog voltage signal to be tested and a digital voltage signal and a second corresponding relation between the digital voltage signal and a target duty ratio, wherein the corresponding relations comprise the first corresponding relation and the second corresponding relation under any specified power value.
In the technical scheme, because the pulse modulation signal (output according to the target duty ratio) is generally generated by a controller such as a single chip microcomputer, a microprocessor or an embedded device, a first corresponding relation between the analog voltage signal and the digital voltage signal needs to be established first, a second corresponding relation between the digital voltage signal and the target duty ratio needs to be established continuously, the digital voltage signal is used as an input signal which can be identified by the controller, and the reliability of the heating control scheme is further improved due to low interference noise of the digital voltage signal.
In the foregoing technical solution, preferably, determining a target duty ratio corresponding to any analog voltage signal at any specified power value according to a corresponding relationship between the analog voltage signal at any specified power value and the target duty ratio includes: determining a digital voltage signal corresponding to the input analog voltage signal according to the first corresponding relation; and determining a target duty ratio corresponding to the input analog voltage signal according to the digital voltage signal and the second corresponding relation.
In the technical scheme, the indirect corresponding relation between the analog voltage signal and the target duty ratio is established through the digital analog signal, and the response speed is high and the reliability is high.
In the above technical solution, preferably, before acquiring the heating instruction with the specified power value, the method further includes: presetting an analog voltage signal range corresponding to any specified power value, wherein the input analog voltage signal belongs to the analog voltage signal range.
In the technical scheme, the safety of the heating control scheme is further improved by presetting the analog voltage signal range corresponding to any specified power value, specifically, if the input analog voltage signal belongs to the analog voltage signal range, the corresponding target duty ratio can be determined according to the corresponding relation, and if the input analog voltage signal does not belong to the analog voltage signal range, the output target duty ratio can be zero, that is, the heating control process is stopped, so as to reduce the hardware damage of the heating control circuit caused by voltage fluctuation.
The steps in the method of the embodiment of the invention can be sequentially adjusted, combined and deleted according to actual needs.
The units in the terminal of the embodiment of the invention can be merged, divided and deleted according to actual needs.
It will be understood by those skilled in the art that all or part of the steps in the methods of the embodiments described above may be implemented by hardware instructions of a program, and the program may be stored in a computer-readable storage medium, where the storage medium includes Read-Only Memory (ROM), Random Access Memory (RAM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), One-time Programmable Read-Only Memory (OTPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Compact Disc Read-Only Memory (CD-ROM), or other Memory, such as a magnetic disk, or a combination thereof, A tape memory, or any other medium readable by a computer that can be used to carry or store data.
The technical scheme of the invention is described in detail with reference to the accompanying drawings, and in consideration of the technical problems of how to simplify the heating control circuit and improve the constant power heating reliability and the like in the related art, the invention provides a new heating control scheme, the target duty ratio is adjusted in real time through the corresponding relation between the analog voltage signal and the target duty ratio under any specified power value so as to ensure constant power heating, the hardware structure of the heating control circuit is simplified, and particularly, a current sampling module is not required to be arranged, so that the manufacturing cost is reduced, in addition, the time synchronization between the voltage signal and the current signal is not required to be ensured, and the reliability of the heating control scheme is improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A heating control method, comprising:
after a heating instruction with a specified power value is obtained, an input analog voltage signal is detected;
determining a target duty ratio corresponding to any analog voltage signal under any specified power value according to the corresponding relation between the analog voltage signal and the target duty ratio under any specified power value;
before acquiring the heating instruction with the appointed power value, the method further comprises the following steps:
under any specified power value, acquiring an analog voltage signal to be tested;
further comprising:
converting the analog voltage signal to be tested into a corresponding digital voltage signal;
storing a first corresponding relation between the analog voltage signal to be tested and the digital voltage signal and a second corresponding relation between the digital voltage signal and the target duty ratio,
wherein the corresponding relationship includes the first corresponding relationship and the second corresponding relationship at any one of the designated power values.
2. The heating control method according to claim 1, before acquiring the heating instruction at the specified power value, further comprising:
and when the analog voltage signal to be tested is input, controlling the duty ratio to be increased from zero to the target duty ratio so as to enable the detected output power value to be equal to the specified power value.
3. The heating control method according to claim 1, wherein determining a target duty cycle corresponding to any one of the analog voltage signals at any specified power value according to a corresponding relationship between the analog voltage signal and the target duty cycle at the any specified power value specifically includes:
determining a digital voltage signal corresponding to the input analog voltage signal according to the first corresponding relation;
and determining a target duty ratio corresponding to the input analog voltage signal according to the digital voltage signal and the second corresponding relation.
4. The heating control method according to any one of claims 1 to 3, further comprising, before acquiring the heating instruction of the specified power value:
presetting the range of the analog voltage signal corresponding to any specified power value,
wherein the input analog voltage signal belongs to the analog voltage signal range.
5. A heating control device, comprising:
the receiving unit is used for detecting an input analog voltage signal after acquiring a heating instruction with a specified power value;
the determining unit is used for determining a target duty ratio corresponding to any analog voltage signal under any specified power value according to the corresponding relation between the analog voltage signal and the target duty ratio under any specified power value;
the receiving unit is further configured to: under any specified power value, acquiring an analog voltage signal to be tested;
further comprising:
the analog-to-digital conversion unit is used for converting the analog voltage signal to be tested into a corresponding digital voltage signal;
a storage unit for storing a first corresponding relation between the analog voltage signal to be tested and the digital voltage signal and a second corresponding relation between the digital voltage signal and the target duty ratio,
wherein the corresponding relationship includes the first corresponding relationship and the second corresponding relationship at any one of the designated power values.
6. The heating control device according to claim 5,
the heating control device further includes:
and the control unit is used for controlling the duty ratio to be increased from zero to the target duty ratio when the analog voltage signal to be tested is input so as to enable the detected output power value to be equal to the specified power value.
7. The heating control device according to claim 5,
the determination unit is further configured to: determining a digital voltage signal corresponding to the input analog voltage signal according to the first corresponding relation;
the determination unit is further configured to: and determining a target duty ratio corresponding to the input analog voltage signal according to the digital voltage signal and the second corresponding relation.
8. The heating control device according to any one of claims 5 to 7, characterized by further comprising:
a presetting unit for presetting the analog voltage signal range corresponding to any appointed power value,
wherein the input analog voltage signal belongs to the analog voltage signal range.
9. A cooking appliance, comprising:
a heating assembly;
a heating control device as claimed in any one of claims 5 to 8, an output of the heating control device being connected to a load input of the heating assembly, an input of the heating control device being connected to an input of an analogue voltage signal.
10. The cooking appliance of claim 9, comprising:
the heating assembly includes an electromagnetic heating coil.
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| CN201710671509.2A CN109392206B (en) | 2017-08-08 | 2017-08-08 | Heating control method, heating control device and cooking appliance |
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| CN103763803A (en) * | 2014-01-23 | 2014-04-30 | 美的集团股份有限公司 | Electromagnetic resonance control circuit, electromagnetic heating device and method for controlling transistor |
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