CN106817780B - Temperature control circuit and electric heating equipment - Google Patents
Temperature control circuit and electric heating equipment Download PDFInfo
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- CN106817780B CN106817780B CN201710034824.4A CN201710034824A CN106817780B CN 106817780 B CN106817780 B CN 106817780B CN 201710034824 A CN201710034824 A CN 201710034824A CN 106817780 B CN106817780 B CN 106817780B
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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
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0227—Applications
- H05B1/023—Industrial applications
- H05B1/0244—Heating of fluids
Abstract
The invention discloses a temperature control circuit and electric heating equipment, wherein the electric heating equipment comprises an inner container, the inner container is provided with a cavity, the temperature control circuit is used for the electric heating equipment, the temperature control circuit comprises an electric heating element, a controllable silicon device, a detection module and a control module, the electric heating element is arranged at the bottom of the inner container, the controllable silicon device is connected with the electric heating element in series, the detection module is used for detecting the actual temperature of the cavity, and the control module is used for judging the relation between the actual temperature of the cavity and the target temperature so that the controllable silicon device controls the electric heating element to be closed or the controllable silicon device adjusts the heating power of the electric heating element. In the temperature control circuit of the embodiment of the invention, the control module can utilize the silicon controlled rectifier device to adjust the heating power of the electric heating element, thus realizing stepless adjustment of the actual temperature of the chamber, further avoiding the phenomenon of heating overtemperature of the electric heating element and ensuring the service life of the electric heating element.
Description
Technical Field
The invention relates to the technical field of electric heating, in particular to a temperature control circuit and electric heating equipment.
Background
In the electric heating equipment of the related art, the heating wire is generally used as an electric heating element to heat water, and when the heating wire is arranged at the bottom of an evaporation tray of the electric heating equipment, the electric heating wire is easy to distribute unevenly, so that the heating of the electric heating element is uneven, the phenomenon of local overheating is easy to occur, the phenomenon of over-temperature heating of the electric heating element is easy to occur, and the service life of the electric heating element is influenced.
Disclosure of Invention
The present invention has been made to solve at least one of the problems occurring in the related art. Therefore, the present invention needs to provide a temperature control circuit and an electric heating device.
The temperature control circuit is used for electric heating equipment, the electric heating equipment comprises an inner container, a cavity is formed in the inner container, the temperature control circuit comprises an electric heating element, a controllable silicon device, a detection module and a control module, the electric heating element is arranged at the bottom of the inner container, the controllable silicon device is connected with the electric heating element in series, the detection module is used for detecting the actual temperature of the cavity, and the control module is used for judging the relation between the actual temperature of the cavity and the target temperature so that the controllable silicon device controls the electric heating element to be closed or the controllable silicon device adjusts the heating power of the electric heating element.
In the temperature control circuit of the embodiment of the invention, the control module can utilize the silicon controlled rectifier device to adjust the heating power of the electric heating element, thus realizing stepless adjustment of the actual temperature of the chamber, further avoiding the phenomenon of heating overtemperature of the electric heating element and ensuring the service life of the electric heating element.
In one embodiment, the temperature control circuit includes a resistor coupled between one end of the electrical heating element and the output of the control module.
In one embodiment, the temperature control circuit includes an input component, the input component is configured to receive a user instruction, the control module is configured to set the target temperature, an allowable temperature deviation value, and a preset heating time according to the user instruction, when an absolute value of a difference between the target temperature and the actual temperature is greater than the allowable temperature deviation value, the control module is configured to enable the thyristor device to control the electric heating element to heat with a first heating power, when the absolute value of the difference between the target temperature and the actual temperature is less than or equal to the allowable temperature deviation value, the control module is configured to enable the thyristor device to control the electric heating element to heat with a second heating power, the second heating power is less than the first heating power, and when an operating time of the electric heating element is greater than or equal to the preset heating time, the control module is used for enabling the silicon controlled rectifier device to control the electric heating element to be closed.
In one embodiment, the detection module includes a temperature sensor, the temperature control circuit includes an amplifying/filtering circuit and an analog-to-digital conversion circuit, the amplifying/filtering circuit is configured to amplify and filter a temperature electrical signal output by the temperature sensor, the analog-to-digital conversion circuit is configured to digitize the amplified and filtered temperature electrical signal, and the control module is configured to obtain the digitized temperature electrical signal to obtain an actual temperature of the chamber.
In one embodiment, the control module comprises a PID control module for controlling a conduction angle of the thyristor device based on a fuzzy PID algorithm with a difference between an actual temperature of the chamber and the target temperature as a first input amount and a rate of change of the difference as a second input amount, so that the thyristor device controls a heating power of the electric heating element and controls the electric heating element to be turned off.
In one embodiment, the temperature control circuit includes a photo coupler coupled between the output of the control module and the thyristor.
In one embodiment, the electrical heating element is a rare earth thick film element.
An electric heating device of an embodiment of the invention comprises a temperature control circuit as described in any of the above embodiments.
In the electric heating equipment of the embodiment of the invention, the control module can utilize the silicon controlled rectifier device to adjust the heating power of the electric heating element, thus realizing stepless adjustment of the actual temperature of the chamber, further avoiding the phenomenon of heating overtemperature of the electric heating element and ensuring the service life of the electric heating element.
In one embodiment, the electrical heating device comprises a steam generating system comprising an evaporation pan disposed at the bottom of the chamber, the electrical heating element being disposed on an outer bottom surface of the evaporation pan.
In one embodiment, the electrical heating apparatus comprises a display screen, and the temperature control circuit is configured to cause the display screen to display the target temperature and the actual temperature of the chamber.
Additional aspects and advantages of embodiments of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a block diagram of a temperature control circuit according to an embodiment of the present invention.
Fig. 2 is a partial circuit schematic diagram of a temperature control circuit according to an embodiment of the present invention.
FIG. 3 is a block diagram of a control module of the temperature control circuit according to an embodiment of the present invention.
Fig. 4 is a flowchart illustrating a heating control method of the temperature control circuit according to the embodiment of the present invention.
Fig. 5 is a schematic structural diagram of an electric heating element of a temperature control circuit according to an embodiment of the present invention.
Fig. 6 is a schematic perspective view of an electric heating apparatus according to an embodiment of the present invention.
Fig. 7 is another perspective view schematically showing an electric heating apparatus according to an embodiment of the present invention.
Description of the main element symbols:
an electric heating device 100;
the temperature control circuit 10, the electrothermal element 11, the resistor 111, the substrate 112, the heat conducting layer 113, the heating circuit layer 114, the first resistor circuit 115, the second resistor circuit 116, the thyristor 12, the detection module 13, the control module 14, the PID control module 141, the fuzzy inference module 142, the PID controller 143, the input component 15, the amplification/filtering circuit 16, the analog-to-digital conversion circuit 161, the photocoupler 17, and the power supply 18;
the steam generating system comprises an inner container 20, a chamber 21, a steam generating system 30, an evaporation tray 31, a water pump 32, a water tank 33 and a display screen 40.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. 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, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present invention, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. Either mechanically or electrically. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1 to 7, a temperature control circuit 10 according to an embodiment of the present invention is used for an electric heating apparatus 100. The electric heating apparatus 100 includes an inner container 20. The inner container 20 is opened with a chamber 21. The temperature control circuit 10 comprises an electric heating element 11, a silicon controlled device 12, a detection module 13 and a control module 14. The electric heating element 11 is arranged at the bottom of the inner container 20. The thyristor device 12 is connected in series with the electrical heating element 11. The detection module 13 is used for detecting the actual temperature t2 of the chamber 21. The control module 13 is used for determining the relation between the actual temperature t2 of the chamber 21 and the target temperature t1 so as to enable the thyristor device 12 to control the electric heating element 11 to be closed, or enable the thyristor device 12 to adjust the heating power of the electric heating element 11.
In the temperature control circuit 10 according to the embodiment of the present invention, the control module 14 can adjust the heating power of the electric heating element 11 by using the silicon controlled device 12, so as to achieve stepless adjustment of the actual temperature t2 of the chamber 21, further avoid the phenomenon of heating over-temperature of the electric heating element 11, and ensure the service life of the electric heating element 11.
In the present example, thyristor device 30 is a triac device. Thus, the control is more accurate.
In one embodiment, temperature control circuit 10 includes a resistor 111. The resistor 111 is connected between one end of the electric heating element 11 and the output end of the control module 14.
Thus, the resistor 111 protects the thyristor 12 and the electric heating element 11, and prevents the thyristor 12 and the electric heating element 11 from being burnt out due to an excessive effective value of the current of the temperature control circuit 10. In the present example, the temperature control circuit 10 is powered by a power supply 18.
In one embodiment, temperature control circuit 10 includes an input assembly 15. The input component 15 is used to receive user instructions. The control module 14 is used for setting the target temperature t1, the allowable temperature deviation value e1 and the heating preset time m1 according to the user command. When the absolute value of the difference e2 between the target temperature t1 and the actual temperature t2 is greater than the allowable temperature deviation value e 1. The control module 14 is configured to enable the thyristor device 12 to control the electric heating element 11 to heat at the first heating power. When the absolute value of the difference e2 between the target temperature t1 and the actual temperature t2 is less than or equal to the allowable temperature deviation value e1, the control module 14 is configured to enable the thyristor device 12 to control the electric heating element 11 to heat at the second heating power. The second heating power is less than the first heating power. When the working time of the electric heating element 11 is greater than or equal to the preset heating time m1, the control module 14 is used for enabling the thyristor device 12 to control the electric heating element 11 to be switched off.
In this way, the user can set the heating preset time m1 and the target temperature t1 according to specific situations, which improves the operability of the operation of the temperature control circuit 10.
Specifically, when the difference e2 between the target temperature t1 and the actual temperature t2 is large, the control module 14 is configured to enable the thyristor device 12 to control the electric heating element 11 to heat with a large first heating power, so that the reduction of the difference e2 between the actual temperature t2 and the target temperature t1 can be realized in a fast time. Similarly, when the difference e2 between the actual temperature t2 in the chamber 21 and the target temperature t1 is small, the control module 14 is configured to enable the thyristor device 12 to control the electric heating element 11 to heat at the second heating power, so as to prevent the actual temperature t2 from exceeding the target temperature t1 and ensure the heating stability of the electric heating element 11. The reliability of the operation of the temperature control circuit 10 is thus also improved.
In the present example, the input assembly 15 includes a key (not shown) connected to the temperature control circuit 10. The input unit 15 receives a user instruction through a key.
In one embodiment, the detection module 13 includes a temperature sensor. The temperature control circuit 10 includes an amplifying/filtering circuit 16 and an analog-to-digital conversion circuit 161. The amplifying/filtering circuit 16 is used for amplifying and filtering the temperature electric signal output by the temperature sensor. The analog-to-digital conversion circuit 161 is used for digitizing the amplified and filtered temperature electrical signal. The control module 14 is used for acquiring the digitized temperature electric signal to obtain the actual temperature t2 of the chamber 21.
Therefore, the temperature electric signal can be enhanced, and the interference can be eliminated so as to ensure the accuracy of signal transmission.
In one embodiment, the control module 14 includes a PID control module 141. The PID control module 141 is configured to use the difference e2 between the actual temperature t2 of the chamber 21 and the target temperature t1 as a first input quantity and the change rate ec of the difference e2 as a second input quantity, and control the conduction angle of the thyristor device 12 based on the fuzzy PID algorithm, so that the thyristor device 12 controls the heating power of the electric heating element 11 and controls the electric heating element 11 to be turned off.
In this way, the temperature control circuit 10 realizes automatic control of the effective value of the current of the electric heating element 11 through the PID control module 141 to realize automatic adjustment control of the heating power of the electric heating element 11, and meanwhile, the setting of the first input quantity and the second input quantity can ensure the accuracy of controlling the conduction angle of the thyristor device 12 based on the fuzzy PID algorithm.
Specifically, when the difference e2 between the actual temperature t2 and the target temperature t1 in the chamber 21 is large, the PID control module 141 takes the difference e2 and the change rate ec of the difference e2 as input quantities, and after the fuzzy PID algorithm operation, the conduction angle of the thyristor 12 can be adjusted to control the electric heating element 11 to increase the heating power properly, so that the difference e2 between the actual temperature t2 and the target temperature t1 can be reduced in a fast time. Similarly, when the difference e2 between the actual temperature t2 of the chamber 21 and the target temperature t1 is small, the PID control module 141 takes the difference e2 and the change rate ec of the difference e2 as input quantities, and after the fuzzy PID algorithm operation, the conduction angle of the thyristor 12 can be adjusted to control the electric heating element 11 to reduce the heating power properly, so as to prevent the actual temperature t2 from exceeding the target temperature t1, and ensure the heating stability of the electric heating element 11. This improves the reliability of the operation of the temperature control circuit 10.
In the present example, the difference e 2-t 1-t2, the rate of change of the difference e2
The PID control module 141 comprises a fuzzy inference module 142 and a PID controller 143, the fuzzy inference module 142 is connected to the PID controller 143, and the PID controller 143 is connected to the thyristor 12. The fuzzy inference module 142 uses the difference e2 and the change rate ec of the difference e2 as input quantities, and the PID controller 143 can also use the difference e2 and the change rate ec of the difference e2 as input quantities. Thus, the combination of the fuzzy inference module 142 and the PID controller 143 enables further optimal control to ensure the accuracy of the signal output by the PID controller 143.
In one embodiment, the temperature control circuit 10 includes a photo coupler 17. The photocoupler 17 is connected between the output terminal of the control module 141 and the thyristor 12.
In this way, the precision of control of the conduction angle of the thyristor device 12 can be improved by using the photo-coupler 17.
In one embodiment, the electrical heating element 11 is a rare earth thick film element.
In this way, the electric heating element 11 has a larger surface heat load under the condition of the same heat conducting area, and the heat conducting efficiency of the electric heating element 20 is higher, and the energy is saved more.
It should be noted that in some embodiments, the electrical heating element 11 is a rare earth thick film element, for example, the material of the rare earth thick film element includes a rare earth oxide material, for example, referring to fig. 5, in the present example, the electrical heating element 11 includes a heat conductive substrate 112, an insulating heat conductive layer 113, and a heat generating circuit layer 114. The heat conductive layer 113 connects the substrate 112 and the heat generating circuit layer 114. The heat generating circuit layer 114 includes a plurality of first resistance circuits 115 having an arc shape and a plurality of second resistance circuits 116 having a linear shape. The plurality of first resistance circuits 115 surrounds the plurality of second resistance circuits 116. The plurality of first resistance circuits 115 and the plurality of second resistance circuits 116 are disposed at intervals. The material of the heat conductive layer 113 includes a rare earth oxide material, and the material of the heat generating circuit layer 114 includes a rare earth oxide material. Thus, the resistance circuits of the heating circuit layer 114 are distributed uniformly, and the space of the heat conducting layer 113 can be fully utilized, so that the heating of the electric heating element 11 is more uniform, the phenomenon of local overheating of the electric heating element 11 can be effectively avoided, and the service life of the electric heating element 11 is ensured.
In the present example, the temperature control circuit 10 is configured to implement the following steps when controlling the operation of the electric heating apparatus 100:
the method comprises the following steps: setting a heating preset time m1, a target temperature t1 and an allowable temperature deviation value e1, and enabling the thyristor device 12 to control the electric heating element 11 to start heating and time the heating time m 2;
step two: detecting the actual temperature t2 of the chamber 21 by using a temperature sensor and judging whether the absolute value of the difference e2 between the actual temperature t2 and the target temperature t1 in the chamber 21 is less than or equal to the allowable temperature deviation value e1, if so, turning to the third step, and if not, turning to the fourth step; step three: judging whether the heating time m2 is equal to the preset heating time m1, if so, turning to the step five, and if not, turning to the step six;
step four: controlling the electric heating element 11 to continue heating by the silicon controlled device 12, and turning to the second step;
step five: the thyristor device 12 controls the electric heating element 11 to stop heating (turn off);
step six: and controlling the electric heating element 11 to continue heating by the thyristor device 12 to keep the absolute value of the difference value e2 less than or equal to the allowable temperature deviation value e1, and turning to the third step.
Therefore, the heating power of the electric heating element 11 can be adjusted by using the silicon controlled device 12, stepless adjustment of the actual temperature t2 of the chamber 21 is realized, and the problems of poor control precision and short service life of the electric heating element 11 caused by frequent opening and closing of the electric heating element 11 can be further avoided.
Specifically, in the sixth step, the thyristor device 12 controls the electric heating element 11 to continue heating to keep the absolute value of the difference value e2 less than or equal to the allowable temperature deviation value e1, and the electric heating element 11 is operated at a certain power to keep the electric heating apparatus 100 warm. And when the actual temperature t2 of the chamber 21 is lower than the set lower limit value, the temperature control circuit 10 can control the electric heating element 11 to increase the power to continue heating. So circulating, after the electric heating apparatus 100 reaches the heating preset time m1 of the work, the thyristor device 12 controls the electric heating element 11 to stop heating.
Referring to fig. 6 to 7, an electric heating apparatus 100 according to an embodiment of the present invention includes a temperature control circuit 10 according to any of the above embodiments.
In the electric heating apparatus 100 according to the embodiment of the present invention, the control module 14 may adjust the heating power of the electric heating element 11 by using the silicon controlled device 12, so as to achieve stepless adjustment of the actual temperature t2 of the chamber 21, further avoid the over-temperature heating phenomenon of the electric heating element 11, and ensure the service life of the electric heating element 11.
In the present example, the electric heating apparatus 100 is an electric steaming oven.
In one embodiment, the electric heating apparatus 100 comprises a steam generating system 30. The steam generating system 30 includes an evaporation pan 31. An evaporation pan 31 is provided at the bottom of the chamber 21. The electric heating element 11 is provided on the outer bottom surface of the evaporation pan 31.
In this way, when the electric heating element 11 is in operation, the electric heating element 11 can accelerate the vaporization of the water in the evaporation tray 31 into steam, and heat the inner container 20 to raise the temperature, and this process can be effectively controlled by the temperature control circuit 10.
In one embodiment, the electrical heating apparatus 100 includes a display screen 40. The temperature control circuit 10 is used to make the display screen 40 display the target temperature t1 and the actual temperature t2 of the chamber 21.
In this manner, the display screen 40 may improve the visibility of the operation of the temperature control circuit 10, thereby facilitating the user and improving the user experience.
In the present example, the steam generating system 30 further includes a water pump 32 and a water tank 33. The water pump 32 is connected to the water tank 33 and the evaporation pan 31. The evaporation pan 31 has a concave shape. A temperature sensor is provided in the chamber 21.
When the electric heating device 100 works, the temperature control circuit 10 can control the water pump 32 to introduce water in the water tank 33 into the evaporation tray 31, the temperature control circuit 10 controls the electric heating element 11 to generate heat, then the electric heating element 11 conducts the generated heat to the water in the evaporation tray 31 to heat the water into high-temperature steam, then the high-temperature steam is diffused in the inner container 20, so that the actual temperature t2 of the chamber 21 is gradually increased, then the temperature sensor converts the actual temperature t2 signal of the chamber 21 into a corresponding electric signal and feeds the electric signal back to the temperature control circuit 10, and then the temperature control circuit 10 controls the actual temperature t2 of the chamber 21.
When the absolute value of the difference e2 between the actual temperature t2 of the chamber 21 and the target temperature t1 is less than or equal to the allowable temperature deviation value e1, the temperature control circuit 10 controls the electric heating element 11 to operate at a certain power to keep the electric heating device 100 warm, and when the actual temperature t2 of the chamber 21 is lower than the set lower limit value, the temperature control circuit 10 can control the electric heating element 11 to increase the power to continue heating. So circulated, after the electric heating apparatus 100 reaches the heating preset time m1 of operation, the temperature control circuit 10 can control the electric heating element 11 to stop heating (turn off).
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
In the description of the present specification, reference to the description of the terms "one embodiment", "some embodiments", "an illustrative embodiment", "an example", "a specific example", or "some examples", etc., means 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, schematic representations of the above terms do not necessarily 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.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (9)
1. The utility model provides a temperature control circuit for electric heating equipment, electric heating equipment includes the inner bag, the cavity has been seted up to the inner bag, its characterized in that, temperature control circuit includes:
the electric heating element is arranged at the bottom of the inner container and is a rare earth thick film element;
the silicon controlled device is connected with the electric heating element in series;
a detection module for detecting an actual temperature of the chamber;
the control module is used for judging the relation between the actual temperature of the chamber and the target temperature so as to enable the silicon controlled device to control the electric heating element to be closed, or enable the silicon controlled device to adjust the heating power of the electric heating element;
the electric heating element comprises a heat-conducting substrate, an insulating heat-conducting layer and a heating circuit layer, wherein the heat-conducting layer is connected with the substrate and the heating circuit layer, the heating circuit layer comprises a plurality of arc-shaped first resistance circuits and a plurality of linear second resistance circuits, the first resistance circuits surround the second resistance circuits, the first resistance circuits and the second resistance circuits are arranged at intervals, the first resistance circuits are connected in parallel, the second resistance circuits are connected in parallel, and the projection area of the heating circuit layer covers the heating circuit layer.
2. The temperature control circuit of claim 1, wherein the temperature control circuit comprises a resistor coupled between one end of the electrical heating element and an output of the control module.
3. The temperature control circuit of claim 1, wherein the temperature control circuit comprises an input device for receiving a user command, and the control module is configured to set the target temperature, the allowable temperature deviation value, and the preset heating time according to the user command;
when the absolute value of the difference value between the target temperature and the actual temperature is larger than the allowable temperature deviation value, the control module is used for enabling the silicon controlled rectifier device to control the electric heating element to heat at a first heating power;
when the absolute value of the difference value between the target temperature and the actual temperature is smaller than or equal to the allowable temperature deviation value, the control module is used for enabling the silicon controlled rectifier device to control the electric heating element to heat at a second heating power, and the second heating power is smaller than the first heating power;
and when the working time of the electric heating element is more than or equal to the heating preset time, the control module is used for enabling the silicon controlled device to control the electric heating element to be closed.
4. The temperature control circuit of claim 1, wherein the detection module comprises a temperature sensor, the temperature control circuit comprises an amplifying/filtering circuit and an analog-to-digital conversion circuit, the amplifying/filtering circuit is used for amplifying and filtering a temperature electrical signal output by the temperature sensor, the analog-to-digital conversion circuit is used for digitizing the amplified and filtered temperature electrical signal, and the control module is used for acquiring the digitized temperature electrical signal to obtain an actual temperature of the chamber.
5. The temperature control circuit of claim 3, wherein the control module comprises a PID control module for taking a difference between an actual temperature of the chamber and the target temperature as a first input quantity and a rate of change of the difference as a second input quantity, and controlling a conduction angle of the thyristor based on a fuzzy PID algorithm so that the thyristor controls the heating power of the electric heating element and controls the electric heating element to be turned off.
6. The temperature control circuit of claim 1, wherein the temperature control circuit comprises an opto-coupler coupled between the output of the control module and the thyristor device.
7. An electric heating device, characterized in that it comprises a temperature control circuit according to any one of claims 1-6.
8. An electrically heated device as claimed in claim 7 wherein said electrically heated device includes a steam generating system including an evaporation tray disposed at the bottom of said chamber, said electrical heating element being disposed on an outer bottom surface of said evaporation tray.
9. An electrical heating apparatus in accordance with claim 7, wherein said electrical heating apparatus comprises a display screen, said temperature control circuit for causing said display screen to display said target temperature and an actual temperature of said chamber.
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| CN201710034824.4A CN106817780B (en) | 2017-01-18 | 2017-01-18 | Temperature control circuit and electric heating equipment |
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| CN201710034824.4A CN106817780B (en) | 2017-01-18 | 2017-01-18 | Temperature control circuit and electric heating equipment |
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| CN107608415A (en) * | 2017-07-11 | 2018-01-19 | 湘潭大学 | A kind of electrical heating pure steam generator based on fuzzy-adaptation PID control |
| CN107713759B (en) * | 2017-11-20 | 2019-12-31 | 厦门芯阳科技股份有限公司 | Temperature control processing method for coffee machine |
| CN110215173A (en) * | 2019-05-27 | 2019-09-10 | 安徽苏立科技股份有限公司 | A kind of dish-washing machine heat-generating disc and its processing technology |
| CN115143735A (en) * | 2022-06-29 | 2022-10-04 | 厦门海辰新能源科技有限公司 | Rapid preheating and drying method, production process of lithium ion battery and lithium ion battery |
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| GB1077803A (en) * | 1965-10-11 | 1967-08-02 | Penn Controls | Improvements in or relating to feedback control systems |
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| US9006617B2 (en) * | 2007-10-01 | 2015-04-14 | Timothy Russell Mullen | Wireless electric heat trace and vibration control and monitoring system |
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