Stepless temperature control method, system and device thereof

Abstract

A stepless temperature control method and system and device thereof. The stepless temperature control method comprises the following steps: S100: analyzing the temperature of air flowing in an air frying cavity of an air fryer detected in real time to obtain the temperature change of the air flowing in the air frying cavity; S200: modulating the parameters of a stepless control signal according to a preset target temperature and the temperature change of the air; and S300: responding to the modulated stepless control signal, steplessly adjusting the heating power of an air heating device of the air fryer so that the temperature of the air flowing in the air frying cavity is maintained within the upper limit and the lower limit of the preset target temperature.

Description

Technical Field

[0001] The present invention relates to the technical field of air frying, and more specifically to a stepless temperature control method and a system and equipment thereof. Background Art

[0002] As a machine that can use hot air to "fry", the air fryer mainly uses hot air to replace the hot oil in the original frying pan to heat the items (such as French fries, vegetables, meat or fish, etc.), and removes the moisture on the surface of the items through the hot air to achieve the frying effect. Since the air fryer can not only greatly eliminate the grease in the items, but also maintain many required qualities of fried items (such as the appearance and taste of fried food), the air fryer has attracted more and more attention and love from users, and has great commercial value.

[0003] Existing air fryers usually include a shell, an electric heater and a fan arranged in the shell, a frying basket that can be placed in the shell, and a controller for controlling the electric heater and the fan. When the frying basket containing the items to be fried is placed in the shell, the fan can blow the air heated by the electric heater into the frying basket to air fry the items to be fried. At the same time, the controller can control the opening and closing of the electric heater according to the detected temperature of the air in the shell, so that the temperature of the air in the shell is kept within a certain range. For example, when it is detected that the air temperature in the shell is greater than a predetermined temperature, the controller will control the electric heater to turn off so that the electric heater stops running (i.e., does not consume electric power), so that the air temperature in the shell drops rapidly; and when it is detected that the air temperature in the shell is less than the predetermined temperature, the controller controls the electric heater to turn on so that the electric heater resumes running (i.e., runs at full power), so that the air temperature in the shell rises.

[0004] However, due to the heating characteristics of the electric heater and the above control method, the air temperature in the existing air fryer will be extremely unstable. On the one hand, if the rated power of the electric heater is high, the thermal inertia of the electric heater is also large. In this way, when the air in the shell is heated to a predetermined temperature, even if the controller controls the electric heater to be turned off, the air temperature in the shell will continue to rise and be significantly higher than the predetermined temperature under the action of thermal inertia; on the other hand, if the rated power of the electric heater is low, there will be a problem of too slow heating speed. In particular, after the electric heater is turned off to stop running for a period of time, since the electric heater does not consume electric power and does not generate heat, and the fan accelerates heat dissipation by blowing air flow or exhaust, the air temperature in the shell will drop rapidly again to be significantly lower than the predetermined temperature. In this way, when the existing air fryer is actually used, the range of up and down fluctuations of the air temperature in the shell is large, which seriously affects the air frying effect of the existing air fryer, such as the appearance and taste of the fried food are poor. Summary of the invention

[0005] An advantage of the present invention is that it provides a stepless temperature control method and system and equipment thereof, which can reduce the temperature fluctuation range of the air in the air fryer and help improve the air frying effect of the air fryer.

[0006] Another advantage of the present invention is to provide a stepless temperature control method and its system and equipment. In one embodiment of the present invention, the stepless temperature control method can control the heating power of the air heating device of the air fryer through pulse waves so as to accurately control the air temperature in the air fryer.

[0007] Another advantage of the present invention is that it provides a stepless temperature control method and its system and equipment. In one embodiment of the present invention, the stepless temperature control method can control the air heating device to frequently switch between a high-power working state and a low-power working state through the high level and low level of the pulse wave, thereby accurately controlling the heating power of the air heating device.

[0008] Another advantage of the present invention is to provide a stepless temperature control method and its system and equipment, wherein, in one embodiment of the present invention, the stepless temperature control method can continuously adjust the heating power of the air heating device by modulating the duty cycle and / or phase of the pulse wave so as to steplessly adjust the air temperature in the air fryer.

[0009] Another advantage of the present invention is that it provides a stepless temperature control method and its system and equipment. In one embodiment of the present invention, the stepless temperature control method can adjust the heating power of the air heating device by changing the effective working voltage or effective working current of the electric heater so as to achieve the desired stepless temperature control effect.

[0010] Another advantage of the present invention is that it provides a stepless temperature control method and its system and equipment. In one embodiment of the present invention, the stepless temperature control method can adjust the heating power of the air heating device by changing the flow rate of the hot fluid in the fluid heat exchanger to achieve a better stepless temperature control effect.

[0011] Another advantage of the present invention is to provide a stepless temperature control method and system and equipment thereof. In one embodiment of the present invention, the air fryer can provide a dry and low-temperature environment for the fan motor, which helps to extend the service life of the fan.

[0012] Another advantage of the present invention is that it provides a stepless temperature control method and system and equipment thereof. In one embodiment of the present invention, the oil stains in the air fryer can be easily removed, which helps to ensure the safety and hygiene of the air fryer.

[0013] Another object of the present invention is to provide a stepless temperature control method and system and device, wherein, in order to achieve the above object, no complex structure or algorithm is required in the present invention. Therefore, the present invention successfully and effectively provides a solution, not only providing a simple stepless temperature control method and system and device, but also increasing the practicality and reliability of the stepless temperature control method and system and device.

[0014] In order to achieve at least one of the above-mentioned invention objects or other objects and advantages, the present invention provides a stepless temperature control method, comprising the steps of:

[0015] S100: analyzing the temperature of air flowing in an air frying cavity of an air fryer detected in real time to obtain a temperature change of the air flowing in the air frying cavity;

[0016] S200: modulating a parameter of a stepless control signal according to a preset target temperature and the temperature change of the air; and

[0017] S300: In response to the modulated stepless control signal, the heating power of an air heating device of the air fryer is steplessly adjusted so that the temperature of the air flowing in the air frying cavity is maintained within the upper limit and the lower limit of the preset target temperature.

[0018] According to an embodiment of the present invention, the stepless control signal is a pulse wave, and the parameter of the stepless control signal includes a duty cycle and / or a phase of the pulse wave.

[0019] According to an embodiment of the present invention, step S300 includes the following steps:

[0020] In response to the high level of the pulse wave, controlling the air heating device to be in a high power working state to generate more heating heat; and

[0021] In response to the low level of the pulse wave, the air heating device is controlled to be in a low-power working state to generate less heating heat.

[0022] According to an embodiment of the present invention, step S200 includes the following steps:

[0023] In response to the current temperature of the air rising to a first temperature threshold between the upper limit and the lower limit of the preset target temperature, reducing the duty cycle of the pulse wave so that the heating power of the air heating device can be steplessly reduced; and

[0024] In response to the current temperature of the air dropping to a second temperature threshold between the upper limit and the lower limit of the preset target temperature, the duty cycle of the pulse wave is increased so that the heating power of the air heating device can be increased steplessly.

[0025] According to an embodiment of the present invention, step S200 includes the following steps:

[0026] In response to the current temperature of the air rising to a first temperature threshold between the upper limit and the lower limit of the preset target temperature, reversely adjusting the phase of the pulse wave so that the heating power of the air heating device can be steplessly reduced; and

[0027] In response to the current temperature of the air dropping to a second temperature threshold between the upper limit and the lower limit of the preset target temperature, the phase of the pulse wave is positively adjusted so that the heating power of the air heating device can be increased steplessly.

[0028] According to one embodiment of the present invention, in step S300: when the air heating device is implemented as an electric heater, and the electric heater includes an electric heating element and a switching device which are arranged in series in a power supply circuit, in response to the high level of the pulse wave, the power supply circuit is instantly turned on by the switching device, so that the current working voltage of the electric heating element is equal to the real-time voltage applied to the electric heating element by the power supply circuit, so that the electric heater is in the high-power working state; and in response to the low level of the pulse wave, the power supply circuit is instantly disconnected by the switching device, so that the current working voltage of the electric heating element is equal to zero, so that the electric heater is in the low-power working state.

[0029] According to an embodiment of the present invention, the switching device is implemented as a solid-state relay.

[0030] According to one embodiment of the present invention, in step S300: when the air heating device is implemented as an electric heater, and the electric heater includes an electric heating element and an adjustable resistor which are arranged in series in the power supply circuit, in response to the high level of the pulse wave, the resistance value of the adjustable resistor is reduced to increase the current operating voltage of the electric heating element, so that the electric heater is in the high-power operating state; in response to the low level of the pulse wave, the resistance value of the adjustable resistor is increased to reduce the current operating voltage of the electric heating element, so that the electric heater is in the low-power operating state.

[0031] According to one embodiment of the present invention, in step S300: when the air heating device is implemented as an electric heater, and the electric heater includes an electric heating element and an adjustable resistor arranged in parallel in the power supply circuit, in response to the high level of the pulse wave, the resistance value of the adjustable resistor is increased to increase the current working current of the electric heating element, so that the electric heater is in the high-power working state; in response to the low level of the pulse wave, the resistance value of the adjustable resistor is decreased to reduce the current working current of the electric heating element, so that the electric heater is in the low-power working state.

[0032] According to one embodiment of the present invention, in step S300: when the air heating device is implemented as a fluid heat exchanger, and the fluid heat exchanger includes a fluid heat exchange element and a flow control device arranged in a heating pipeline, in response to the high level of the pulse wave, the flow rate of the hot fluid provided to the fluid heat exchange element via the heating pipeline is increased by the flow control device, so that the fluid heat exchanger is in the high-power working state; in response to the low level of the pulse wave, the flow rate of the hot fluid provided to the fluid heat exchange element via the heating pipeline is reduced by the flow control device, so that the fluid heat exchange device is in the low-power working state.

[0033] According to an example of the present invention, the present invention further provides a stepless temperature control system, wherein the stepless temperature control system is applicable to an air fryer, and the air fryer comprises an air frying cavity, an air circulation device for driving air to circulate in the air frying cavity, and an air heating device for heating the air circulated in the air frying cavity, wherein the stepless temperature control system for the air fryer comprises:

[0034] a temperature analysis module, used to analyze the temperature of the air flowing in the air frying cavity detected in real time to obtain the temperature change of the air flowing in the air frying cavity;

[0035] a signal modulation module, used for modulating the parameters of a stepless control signal according to a preset target temperature and the temperature change of the air; and

[0036] A power regulating module is used to steplessly regulate the heating power of the air heating device in response to the modulated stepless control signal, so that the temperature of the air flowing in the air frying cavity is maintained within the upper limit and the lower limit of the preset target temperature.

[0037] According to an embodiment of the present invention, the stepless control signal is a pulse wave, and the parameter of the stepless control signal includes a duty cycle and / or a phase of the pulse wave.

[0038] According to one embodiment of the present invention, the power regulation module is further used to: in response to the high level of the pulse wave, control the air heating device to be in a high-power working state to generate more heating heat; and in response to the low level of the pulse wave, control the air heating device to be in a low-power working state to generate less heating heat.

[0039] According to one embodiment of the present invention, the signal modulation module includes a duty cycle adjustment module, wherein the duty cycle adjustment module is used to: in response to the current temperature of the air rising to a first temperature threshold between the upper limit and the lower limit of the preset target temperature, reduce the duty cycle of the pulse wave so that the heating power of the air heating device can be steplessly reduced; and in response to the current temperature of the air decreasing to a second temperature threshold between the upper limit and the lower limit of the preset target temperature, increase the duty cycle of the pulse wave so that the heating power of the air heating device can be steplessly increased.

[0040] According to one embodiment of the present invention, the signal modulation module includes a phase adjustment module, wherein the phase adjustment module is used to: in response to the current temperature of the air rising to a first temperature threshold between the upper limit and the lower limit of the preset target temperature, reversely adjust the phase of the pulse wave so that the heating power of the air heating device can be steplessly reduced; and in response to the current temperature of the air decreasing to a second temperature threshold between the upper limit and the lower limit of the preset target temperature, forwardly adjust the phase of the pulse wave so that the heating power of the air heating device can be steplessly increased.

[0041] According to one embodiment of the present invention, when the air heating device is implemented as an electric heater, and the electric heater includes an electric heating element and a switching device which are arranged in series in a power supply circuit, the power regulation module is further used to: in response to the high level of the pulse wave, instantly turn on the power supply circuit through the switching device, so that the current working voltage of the electric heating element is equal to the real-time voltage applied to the electric heating element through the power supply circuit, so that the electric heater is in the high-power working state; and in response to the low level of the pulse wave, instantly disconnect the power supply circuit through the switching device, so that the current working voltage of the electric heating element is equal to zero, so that the electric heater is in the low-power working state.

[0042] According to one embodiment of the present invention, when the air heating device is implemented as an electric heater, and the electric heater includes an electric heating element and an adjustable resistor arranged in series in the power supply circuit, the power regulation module is further used to: in response to the high level of the pulse wave, reduce the resistance value of the adjustable resistor to increase the current operating voltage of the electric heating element so that the electric heater is in the high-power operating state; in response to the low level of the pulse wave, increase the resistance value of the adjustable resistor to reduce the current operating voltage of the electric heating element so that the electric heater is in the low-power operating state.

[0043] According to one embodiment of the present invention, when the air heating device is implemented as an electric heater, and the electric heater includes an electric heating element and an adjustable resistor arranged in parallel in the power supply circuit, the power regulation module is further used to: in response to the high level of the pulse wave, increase the resistance value of the adjustable resistor to increase the current operating current of the electric heating element, so that the electric heater is in the high-power operating state; in response to the low level of the pulse wave, decrease the resistance value of the adjustable resistor to reduce the current operating current of the electric heating element, so that the electric heater is in the low-power operating state.

[0044] According to one embodiment of the present invention, when the air heating device is implemented as a fluid heat exchanger, and the fluid heat exchanger includes a fluid heat exchange element and a flow control device arranged in a heating pipeline, the power regulation module is further used to: in response to the high level of the pulse wave, increase the flow rate of the hot fluid provided to the fluid heat exchange element via the heating pipeline through the flow control device, so that the fluid heat exchanger is in the high-power working state; in response to the low level of the pulse wave, reduce the flow rate of the hot fluid provided to the fluid heat exchange element via the heating pipeline through the flow control device, so that the fluid heat exchange device is in the low-power working state.

[0045] According to an example of the present invention, the present invention further provides an electronic device, comprising:

[0046] a processor for executing program instructions; and

[0047] a memory, wherein the memory is configured to store program instructions executable by the processor to implement a stepless temperature control method, wherein the stepless temperature control method comprises the steps of:

[0048] S100: analyzing the temperature of air flowing in an air frying cavity of an air fryer detected in real time to obtain a temperature change of the air flowing in the air frying cavity;

[0049] S200: modulating a parameter of a stepless control signal according to a preset target temperature and the temperature change of the air; and

[0050] S300: In response to the modulated stepless control signal, the heating power of an air heating device of the air fryer is steplessly adjusted so that the temperature of the air flowing in the air frying cavity is maintained within the upper limit and the lower limit of the preset target temperature.

[0051] Further objects and advantages of the present invention will be fully apparent from an understanding of the following description and the accompanying drawings.

[0052] These and other objects, features and advantages of the present invention will be more fully understood from the following detailed description, accompanying drawings and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 4 is a flow chart of a stepless temperature control method according to an embodiment of the present invention.

[0054] Figure 2 An example of a stepless control signal in the stepless temperature control method according to the above embodiment of the present invention is shown.

[0055] Figure 3 A schematic diagram of a temperature fluctuation curve in the stepless temperature control method according to the above embodiment of the present invention is shown.

[0056] Figure 4 A schematic flow chart of the power regulation step in the stepless temperature control method according to the above embodiment of the present invention is shown.

[0057] Figure 5 A schematic flow chart of the signal modulation step in the stepless temperature control method according to the above embodiment of the present invention is shown.

[0058] Figure 6 A first example of the stepless temperature control method according to the above embodiment of the present invention is shown.

[0059] Figure 7A schematic diagram showing the change of duty cycle in the stepless temperature control method according to the first example of the present invention is shown.

[0060] Figure 8 A second example of the stepless temperature control method according to the above embodiment of the present invention is shown.

[0061] Fig. 9 A third example of the stepless temperature control method according to the above embodiment of the present invention is shown.

[0062] Fig.10 A first variant implementation of the stepless temperature control method according to the above embodiment of the present invention is shown.

[0063] Fig.11 A schematic diagram showing phase changes in the stepless temperature control method according to the above-mentioned variant embodiment of the present invention is shown.

[0064] Fig.12 A second variant implementation of the stepless temperature control method according to the above embodiment of the present invention is shown.

[0065] Fig.13 A first example of the stepless temperature control method according to the second variant embodiment of the present invention is shown.

[0066] Fig.14 A second example of the stepless temperature control method according to the second variant embodiment of the present invention is shown.

[0067] Fig.15 A third example of the stepless temperature control method according to the second variant embodiment of the present invention is shown.

[0068] Fig.16 is a schematic block diagram of a stepless temperature control system according to an embodiment of the present invention.

[0069] Fig.17 A block diagram of an electronic device according to an embodiment of the present invention is shown.

[0070] Fig.18 Schematic diagram of a block diagram of an air frying device according to an embodiment of the present invention.

[0071] Fig.19 A three-dimensional schematic diagram of the air frying device according to the above embodiment of the present invention is shown.

[0072] Fig. 20 A cross-sectional schematic diagram of the air frying device according to the above embodiment of the present invention is shown.

[0073] Fig.21A schematic diagram of an explosion of the air frying device according to the above embodiment of the present invention is shown. DETAILED DESCRIPTION

[0074] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0075] In the present invention, the term "one" in the claims and the specification should be understood as "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple. Unless it is clearly indicated in the disclosure of the present invention that the number of the element is only one, the term "one" cannot be understood as unique or single, and the term "one" cannot be understood as a limitation on the quantity.

[0076] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0077] At present, the existing air fryer usually uses a switch such as a mechanical relay to control the electric heater in an open circuit and a closed circuit, so that the electric heater has only two working states: zero power and full power. Since the electric heater in the full power working state can generate a large amount of new heat to quickly increase the temperature in the existing air fryer, and the electric heater in the zero power working state does not generate new heat to quickly reduce the temperature in the existing air fryer, the temperature in the existing air fryer will have a large fluctuation range due to the jumping back and forth switching of the electric heater between the zero power working state and the full power working state, so that the air frying effect of the existing air fryer is seriously affected, such as the appearance and taste of the fried food are poor.

[0078] In order to reduce the fluctuation range of the temperature in the existing air fryer, an existing temperature control scheme is to set a plurality of electric heaters with different heating powers in the existing air fryer, and selectively control some or all of the electric heaters to enter the full-power working state according to the temperature control needs, so as to reduce the variation range of the overall heating power, thereby reducing the fluctuation range of the temperature in the existing air fryer, which helps to reduce the impact on the air frying effect of the existing air fryer. However, this temperature control scheme will not only greatly increase the structural complexity and manufacturing difficulty of the air fryer, but also the existing air fryer can only be provided with a small number of electric heaters due to the limitation of its own spatial structure, resulting in the overall heating power in the existing air fryer still jumping switching, which cannot significantly reduce the temperature fluctuation range in the existing air fryer, and it is difficult to meet the high standard requirements of the excellent air frying effect on the constant temperature.

[0079] In fact, in order to obtain excellent air frying effect, the air flowing in the air fryer needs to maintain a constant temperature as much as possible, that is, the smaller the temperature fluctuation of the air flowing in the air fryer, the better. In order to achieve this effect, the present invention provides a stepless temperature control method and its system and equipment, which can steplessly adjust the overall heating power in the air fryer according to the temperature change of the air flowing in the air fryer to minimize the temperature fluctuation of the air flowing in the air fryer, thereby improving the air frying effect of the air fryer on the items to be fried. It can be understood that the items to be fried mentioned in the present invention can be foods such as French fries, vegetables, meat or fish, etc., or inedible industrial products, etc., and the present invention is not limited to this.

[0080] Schematic method

[0081] Reference to the attached drawings of the specification Figures 1 to 7 As shown, a stepless temperature control method according to an embodiment of the present invention is illustrated. The stepless temperature control method is applicable to controlling an air fryer 1, and the air fryer 1 may generally include an air frying cavity 10 for accommodating items to be fried, an air circulation device 20 for driving air to circulate in the air frying cavity 10, and an air heating device 30 for heating the air flowing in the air frying cavity 10. In this way, after the items to be fried are placed in the air frying cavity 10, the air heated by the air heating device 30 will contact the items to be fried under the drive of the air circulation device 20 to complete the air frying process of the items to be fried.

[0082] It is to be understood that although the present invention is Figures 1 to 7The air fryer 1 shown is used as an example to illustrate the advantages and features of the stepless temperature control method of the present invention, but the specific structure of the air fryer 1 is only an example and does not constitute a limitation on the stepless temperature control method of the present invention. For example, in other examples of the present invention, the specific structure of the air fryer 1 can also be implemented as other types of structures as long as the desired air frying effect can be achieved.

[0083] Specifically, Figure 1 and Figure 3 As shown, the stepless temperature control method of the above embodiment of the present invention may include the following steps:

[0084] S100: analyzing the temperature of the air flowing in the air frying cavity 10 of the air fryer 1 detected in real time to obtain the temperature change of the air flowing in the air frying cavity 10;

[0085] S200: modulating parameters of a stepless control signal according to a preset target temperature and the temperature change of the air; and

[0086] S300: In response to the modulated stepless control signal, the heating power of the air heating device 30 of the air fryer 1 is steplessly adjusted so that the temperature of the air flowing in the air frying cavity 10 is maintained within the upper and lower limits of the preset target temperature.

[0087] It is worth noting that the stepless temperature control method of the present invention can steplessly adjust the heating power of the air heating device 30 through the stepless control signal, so that the air heating device 30 can work at any required heating power between zero power and full power. In other words, the stepless temperature control method of the present invention can continuously adjust the heating power of the air heating device 30, unlike the existing temperature control scheme that can only adjust the heating power of the electric heater in a jumpy manner, thereby ensuring that the stepless temperature control method of the present invention can minimize the temperature fluctuation amplitude of the air flowing in the air frying cavity 10 of the air fryer 1.

[0088] Preferably, the stepless control signal of the present invention can be implemented as a pulse wave, wherein the parameters of the stepless control signal can include but are not limited to the duty cycle of the pulse wave. It is understandable that the pulse wave can be implemented as but is not limited to a rectangular wave, a sawtooth wave, a triangle wave, a peak wave or a step wave, etc. For ease of description, the rectangular wave is used as an example for explanation below. In addition, Figure 2 As shown, the duty cycle of the pulse wave refers to the ratio between the pulse width (ie, the time t0 corresponding to the high level of the pulse wave within a pulse period T) and the pulse period T, that is, t0 / T.

[0089] More preferably, the pulse frequency of the stepless control signal of the present invention may be above 50 Hz, which means that the state switching frequency of the air heating device 30 is also above 50 Hz (i.e., the air heating device 30 switches states at least once within 20 ms), so as to improve the adjustment accuracy of the heating power of the air heating device 30. Of course, in other examples of the present invention, the pulse frequency of the stepless control signal may also be less than 50 Hz, which will not be elaborated in the present invention.

[0090] It is worth noting that according to the above embodiments of the present invention, Figure 4 As shown, the step S300 of the stepless temperature control method may include the following steps:

[0091] S310: In response to the high level of the pulse wave, controlling the air heating device 30 to be in a high power working state to generate more heating heat; and

[0092] S320: In response to the low level of the pulse wave, the air heating device 30 is controlled to be in a low power working state to generate less heating heat.

[0093] It is worth noting that when the duty cycle of the pulse wave is increased, the pulse time of the pulse wave becomes longer, so that the time that the air heating device 30 is in a high-power working state within one pulse cycle is extended, and the time in the low-power working state is shortened, so the heating power of the air heating device 30 is increased; correspondingly, when the duty cycle of the pulse wave is decreased, the pulse time of the pulse wave becomes shorter, so that the time that the air heating device 30 is in a high-power working state within one pulse cycle is shortened, and the time in the low-power working state is extended, so the heating power of the air heating device 30 is reduced.

[0094] In the above-mentioned embodiments of the present invention, Figure 5 As shown, the step S200 of the stepless temperature control method may include the following steps:

[0095] S210: in response to the current temperature of the air rising to a first temperature threshold between the upper limit and the lower limit of the preset target temperature, reducing the duty cycle of the pulse wave so that the heating power of the air heating device 30 of the air fryer 1 can be steplessly reduced; and

[0096] S220: In response to the current temperature of the air dropping to a second temperature threshold between the upper limit and the lower limit of the preset target temperature, the duty cycle of the pulse wave is increased so that the heating power of the air heating device 30 of the air fryer 1 can be steplessly increased.

[0097] It is worth noting that, since the duty cycle of the pulse wave can be precisely fine-tuned, the time that the air heating device 30 is in a high-power working state within a pulse cycle can be slightly changed, so the stepless temperature control method of the present invention can steplessly adjust the heating power of the air heating device 30 to minimize the temperature fluctuation amplitude of the air flowing in the air frying cavity 10 of the air fryer 1. In other words, when the current temperature of the air rises to the first temperature threshold, the heating power of the air heating device 30 can be reduced by reducing the duty cycle of the pulse wave, and the air temperature in the air frying cavity 10 of the air fryer 1 will also decrease accordingly; and when the current temperature of the air decreases to the second temperature threshold, the heating power of the air heating device 30 can be increased by increasing the duty cycle of the pulse wave, and the air temperature in the air frying cavity 10 of the air fryer 1 will also increase accordingly.

[0098] Preferably, both the first temperature threshold and the second temperature threshold can be implemented as the preset target temperature, so as to further reduce the upper limit and the lower limit of the preset target temperature. Of course, in other examples of the present invention, the first temperature threshold can also be any temperature between the preset target temperature and the upper limit of the preset target temperature; the second temperature threshold can also be any temperature between the lower limit of the preset target temperature and the preset target temperature, which will not be described in detail in the present invention.

[0099] In particular, when the air fryer 1 is just started, the air temperature in the air frying cavity 10 of the air fryer 1 is usually low (i.e., much lower than the preset target temperature). At this time, the air temperature in the air frying cavity 10 needs to be quickly increased to the preset target temperature to improve the air frying efficiency. Therefore, the air heating device 30 of the air fryer 1 usually works at full power first. After the air fryer 1 completes the air frying process, the air temperature in the air frying cavity 10 of the air fryer 1 is usually still high (i.e., much higher than normal temperature). At this time, the air temperature in the air frying cavity 10 needs to be quickly reduced so as to take out the fried items as soon as possible. Therefore, the air heating device 30 of the air fryer 1 usually works at zero power at the end.

[0100] According to the above embodiments of the present invention, Figure 6 As shown, the air heating device 30 of the air fryer 1 can be, but is not limited to, implemented as an electric heater 31 disposed in the air frying cavity 10 , wherein the electric heater 31 is used to convert electrical energy into thermal energy to heat the air in the air frying cavity 10 .

[0101] For example, in the first example of the present invention, Figure 6 As shown, the electric heater 31 may include a power supply circuit 311 for connecting to a power source E, an electric heating element 312 arranged in the power supply circuit 311, and a switching device 313 arranged in the power supply circuit 311, wherein the switching device 313 and the electric heating element 312 are connected in series to the power supply circuit 311, and are used to respond to the stepless control signal to instantly turn on or off the power supply circuit 311 to switch the real-time heating value of the electric heating element 312.

[0102] It is worth noting that the electric heating element 312 of the electric heater 31 is usually implemented as an electric heating tube or electric heating wire, etc., and the heating power of the electric heater 31 is usually positively correlated with the effective working voltage or effective working current of the electric heating element 312 of the electric heater 31, that is, the greater the effective working voltage or effective working current of the electric heating element 312, the greater the heating power of the electric heater 31, and vice versa. It can be understood that the effective working voltage or the effective working current of the electric heating element 312 can be implemented as the average working voltage or average working current of the electric heating element 312 in one pulse cycle.

[0103] Exemplarily, in the step S310 of the stepless temperature control method of the first example of the present invention:

[0104] In response to the high level of the pulse wave, the power supply circuit 311 of the electric heater 31 is instantly turned on through the switching device 313 of the electric heater 31, so that the current working voltage of the electric heating element 312 of the electric heater 31 is equal to the real-time voltage applied to the electric heating element 312 through the power supply circuit 311, so that the electric heater 31 is in the high-power working state.

[0105] In the step S320 of the stepless temperature control method of the first example of the present invention:

[0106] In response to the low level of the pulse wave, the power supply circuit 311 of the electric heater 31 is instantly disconnected through the switch device 313 of the electric heater 31, so that the current working voltage of the electric heating element 312 of the electric heater 31 is equal to zero, so as to be in the low-power working state.

[0107] Preferably, the switch device 313 of the electric heater 31 of the present invention is implemented as a solid-state relay 3131, so as to directly drive a large current load (such as the electric heating element 312) through the tiny stepless control signal. It is understandable that although the traditional mechanical relay can also control the conduction or disconnection of the output circuit, there will be a huge transient current at the moment of conduction or disconnection, which will cause the traditional mechanical relay to generate electric sparks at the moment of conduction or disconnection, thereby damaging the life of the relay and posing a huge safety hazard. In addition, the action time of the traditional mechanical relay is relatively long, which is completely unable to meet the requirements of the stepless temperature control method of the present invention for high-frequency switching or instant switching.

[0108] For example, Figure 7 As shown, taking the case where the power source E provides 50 Hz alternating current and the stepless control signal is a pulse wave with a frequency of 100 Hz as an example, when the duty cycle of the stepless control signal is 1 / 2, the effective working voltage of the electric heater 31 is equal to half of the effective voltage of the power source E; when the duty cycle of the stepless control signal is adjusted to be less than 1 / 2, the effective working voltage of the electric heater 31 is reduced accordingly to be less than half of the effective voltage of the power source E, so that the heating power of the electric heater 31 is reduced; when the duty cycle of the stepless control signal is adjusted to be greater than 1 / 2, the effective working voltage of the electric heater 31 is increased accordingly to be greater than half of the effective voltage of the power source E, so that the heating power of the electric heater 31 is increased.

[0109] It is worth noting that in the second example of the present invention, Figure 8 As shown, the switch device 313 in the electric heater 31 can also be replaced by an adjustable resistor 314, wherein the adjustable resistor 314 and the electric heating element 312 are connected in series to the power supply circuit 311, so as to change the effective working voltage of the electric heating element 312 by adjusting the resistance value of the adjustable resistor 314, thereby achieving the purpose of accurately regulating the heating power of the electric heater 31. It can be understood that in the second example of the present invention, the power source E is preferably implemented as a constant voltage power source to ensure that the voltage of the electric heating element 312 is accurately changed by adjusting the resistance value of the adjustable resistor 314.

[0110] Exemplarily, in the step S310 of the stepless temperature control method of the second example of the present invention:

[0111] In response to the high level of the pulse wave, the resistance value of the adjustable resistor 314 is reduced to increase the current working voltage of the electric heating element 312 of the electric heater 31 so that the electric heater 31 is in the high-power working state.

[0112] In the step S320 of the stepless temperature control method of the second example of the present invention:

[0113] In response to the low level of the pulse wave, the resistance value of the adjustable resistor 314 is increased to reduce the current working voltage of the electric heating element 312 of the electric heater 31 so that the electric heater 31 is in the low-power working state.

[0114] Furthermore, in the third example of the present invention, as Fig. 9 As shown, the power supply E is implemented as a constant current power supply, and the adjustable resistor 314 and the electric heating element 312 are connected in parallel to the power supply circuit 311, so as to change the effective working current of the electric heating element 312 by adjusting the resistance value of the adjustable resistor 314, thereby achieving the purpose of accurately regulating the heating power of the electric heater 31.

[0115] Exemplarily, in the step S310 of the stepless temperature control method of the third example of the present invention:

[0116] In response to the high level of the pulse wave, the resistance value of the adjustable resistor 314 is increased to increase the current working current of the electric heating element 312 of the electric heater 31, so that the heating power of the electric heater 31 is increased to be in the high-power working state.

[0117] In the step S320 of the stepless temperature control method of the third example of the present invention:

[0118] In response to the low level of the pulse wave, the resistance value of the adjustable resistor 314 is reduced to reduce the current working current of the electric heating element 312 of the electric heater 31, so that the heating power of the electric heater 31 is reduced to be in the low-power working state.

[0119] It is worth mentioning that Fig.10 and Fig.11 The first variant implementation of the stepless temperature control method according to the above embodiment of the present invention is shown, wherein the parameter of the stepless control signal may include, but is not limited to, the phase of the pulse wave. It can be understood that the phase of the pulse wave refers to the ratio of the starting time difference of the high level of the pulse wave to the pulse period.

[0120] Specifically, Fig.10 As shown, in the above first variant implementation of the present invention, the step S200 of the stepless temperature control method may include the following steps:

[0121] S210': in response to the current temperature of the air rising to a first temperature threshold between the upper limit and the lower limit of the preset target temperature, reversely adjusting the phase of the pulse wave so that the heating power of the air heating device 30 of the air fryer 1 can be steplessly reduced; and

[0122] S220': In response to the current temperature of the air dropping to a second temperature threshold between the upper limit and the lower limit of the preset target temperature, the phase of the pulse wave is positively adjusted so that the heating power of the air heating device 30 of the air fryer 1 can be steplessly increased.

[0123] It is worth noting that since the phase of the pulse wave can be precisely fine-tuned, the real-time working voltage of the air heating device 30 in a high-power working state can change slightly, thereby changing the effective working voltage of the air heating device 30 within a pulse cycle. Therefore, the stepless temperature control method of the present invention can steplessly adjust the heating power of the air heating device 30 by regulating the phase of the pulse wave, so as to minimize the temperature fluctuation amplitude of the air flowing in the air frying cavity 10 of the air fryer 1.

[0124] For example, Fig.11 As shown, taking the case where the power source E provides 50HZ AC power and the stepless control signal is a pulse wave with a frequency of 100HZ and a duty cycle of 1 / 2 as an example, when the phase of the stepless control signal is 0°, the effective working voltage of the electric heater 31 is equal to half of the effective voltage of the power source E; when the phase of the stepless control signal is reversely adjusted to be less than 0°, the effective working voltage of the electric heater 31 decreases to be less than half of the effective voltage of the power source E, so that the heating power of the electric heater 31 decreases; when the duty cycle of the stepless control signal is forwardly adjusted to be greater than 0°, the effective working voltage of the electric heater 31 increases to be greater than half of the effective voltage of the power source E, so that the heating power of the electric heater 31 increases. Preferably, the phase of the stepless control signal is adjusted between -45° and 45° to ensure that the effective working voltage of the electric heater 31 is positively correlated with the phase of the stepless control signal.

[0125] It is worth mentioning that Fig.12 and Fig.13A second variant implementation of the stepless temperature control method according to the above embodiment of the present invention is shown, wherein the air heating device 30 can also be implemented as, but not limited to, a fluid heat exchanger 32 disposed in the air frying cavity 10, wherein the fluid heat exchanger 32 is used to transfer the heat energy of the hot fluid to the air in the air frying cavity 10 to heat the air in the air frying cavity 10.

[0126] Specifically, the fluid heat exchanger 32 may include a heating pipeline 321 for connecting to a heat source Q, a fluid heat exchange element 322 arranged on the heating pipeline 321, and a flow control device 323 arranged on the heating pipeline 321, wherein the heat source Q is used to provide a hot fluid, and the flow control device 323 is used to adjust the flow rate of the hot fluid transported to the fluid heat exchange element 322 via the heating pipeline 321 in response to the stepless control signal, so as to steplessly adjust the heating power of the fluid heat exchanger 32.

[0127] It is worth noting that the fluid heat exchange element 322 of the fluid heat exchanger 32 is usually implemented as a coil, etc., and the heating power of the fluid heat exchanger 32 is usually positively correlated with the fluid flow rate in the fluid heat exchange element 322 (i.e., the flow rate of the hot fluid transported via the heating pipeline 321), that is, the greater the flow rate of the hot fluid transported via the heating pipeline 321, the greater the heating power of the fluid heat exchanger 32, and vice versa. It can be understood that the hot fluid provided by the heat source Q of the present invention can be, but is not limited to, implemented as high-temperature gas or high-temperature liquid, etc.

[0128] More specifically, if Fig.12 As shown, the step S300 of the stepless temperature control method of the second variant embodiment of the present invention may further include the following steps:

[0129] S310': in response to the high level of the stepless control signal, the flow rate of the hot fluid delivered to the fluid heat exchange element 322 via the heat supply pipeline 321 is increased by the flow control device 323, so that the fluid heat exchanger 32 is in the high power working state; and

[0130] S320': In response to the low level of the stepless control signal, the flow control device 323 reduces the flow of the hot fluid delivered to the fluid heat exchange element 322 via the heat supply pipeline 321, so that the fluid heat exchanger 32 is in the low power working state.

[0131] For example, Fig.13A first example of the stepless temperature control method according to the above-mentioned second variant embodiment of the present invention is shown, wherein the flow control device 323 can be implemented as an opening and closing valve 3231, wherein the opening and closing valve 3231 and the fluid heat exchange element 322 are connected in series to the heating pipeline 321, and are used to respond to the stepless control signal to instantly open and close the heating pipeline 321 to switch the real-time flow of the hot fluid transported to the fluid heat exchange element 322 via the heating pipeline 321.

[0132] Preferably, in the first example of the stepless temperature control method according to the second variant embodiment of the present invention:

[0133] In response to the high level of the pulse wave, the heat supply pipeline 321 of the fluid heat exchanger 32 is instantly opened through the on-off valve 3231, so that the current flow rate of the hot fluid flowing through the fluid heat exchange element 322 is equal to the real-time flow rate of the hot fluid transported through the heat supply pipeline 321, so that the fluid heat exchanger 32 is in the high-power working state; and

[0134] In response to the low level of the pulse wave, the heating pipeline 321 is instantly closed through the opening and closing valve 3231, so that the current flow rate of the hot fluid in the fluid heat exchange element 322 of the fluid heat exchanger 32 is equal to zero, so that the fluid heat exchanger 32 is in the low-power working state.

[0135] It is worth noting that since the hot fluid provided by the heat source Q usually flows in the heat supply pipeline 321 under the action of a pump, the total flow rate of the hot fluid flowing in the heat supply pipeline 321 is usually constant. Therefore, in order to change the flow rate of the hot fluid flowing through the fluid heat exchange element 322, the heat supply pipeline 321 of the fluid heat exchanger 32 usually includes a main pipeline 3211 and a bypass pipeline 3212 for setting the fluid heat exchange element 322, and the opening and closing valve 3231 and the fluid heat exchange element 322 are connected in series to the main pipeline 3211 of the heat supply pipeline 321, and are used to respond to the stepless control signal to instantly open and close the main pipeline 3211 of the heat supply pipeline 321 to switch the flow rate of the hot fluid flowing through the fluid heat exchange element 322 (that is, the flow rate of the hot fluid transported via the main pipeline 3211).

[0136] Specifically, attached Fig.14A second example of the stepless temperature control method according to the second variant embodiment of the present invention is shown, wherein the opening and closing valve 3231 can also be arranged in the bypass pipeline 3212 of the heating pipeline 321, and is used to respond to the stepless control signal to instantly open and close the bypass pipeline 3212 of the heating pipeline 321 to switch the real-time flow rate of the hot fluid flowing through the fluid heat exchange element 322 (i.e., the flow rate of the hot fluid transported via the main pipeline 3211).

[0137] Preferably, in the second example of the stepless temperature control method according to the second variant embodiment of the present invention:

[0138] In response to the high level of the pulse wave, the bypass pipeline 3212 of the heat supply pipeline 321 of the fluid heat exchanger 32 is instantly closed through the on-off valve 3231 to increase the real-time flow rate of the hot fluid flowing through the fluid heat exchange element 322, so that the fluid heat exchanger 32 is in the high-power working state; and

[0139] In response to the low level of the pulse wave, the bypass pipe 3212 of the heating pipe 321 is instantly opened through the opening and closing valve 3231 to reduce the real-time flow rate of the hot fluid flowing through the fluid heat exchange element 322, so that the fluid heat exchanger 32 is in the low-power working state.

[0140] It is worth noting that in other examples of the present invention, the flow control device 323 in the fluid heat exchanger 32 can also be implemented as a non-opening and closing valve such as a variable valve, so as to adjust the real-time flow of the hot fluid flowing through the fluid heat exchange element 322 by changing its own valve opening, and the heating power of the fluid heat exchanger 32 can still be adjusted steplessly.

[0141] For example, Fig.15 A third example of the stepless temperature control method according to the second variant embodiment of the present invention is shown, wherein the flow control device 323 can be implemented as a variable valve 3232, wherein the variable valve 3232 and the fluid heat exchange element 322 are connected in series to the heating pipeline 321, and is used to respond to the stepless control signal to instantly change the valve opening of the variable valve 3232 to switch the real-time flow rate of the hot fluid delivered to the fluid heat exchange element 322 via the heating pipeline 321.

[0142] Preferably, in the third example of the stepless temperature control method according to the second variant embodiment of the present invention:

[0143] In response to the high level of the pulse wave, the valve opening of the variable valve 3232 is instantly increased to increase the real-time flow rate of the hot fluid flowing through the fluid heat exchange element 322, so that the fluid heat exchanger 32 is in the high-power working state; and

[0144] In response to the low level of the pulse wave, the valve opening of the variable valve 3232 is instantly reduced to reduce the real-time flow rate of the hot fluid flowing through the fluid heat exchange element 322, so that the fluid heat exchanger 32 is in the low-power working state.

[0145] Schematic system

[0146] Reference to the attached drawings of the specification Figures 6 to 16 As shown, a stepless temperature control system according to an embodiment of the present invention is illustrated, wherein the stepless temperature control system 40 is applicable to an air fryer 1, and the air fryer 1 includes an air frying cavity 10, an air circulation device 20 for driving air to circulate in the air frying cavity 10, and an air heating device 30 for heating the air circulated in the air frying cavity 10.

[0147] Specifically, Fig.16 As shown, the stepless temperature control system 40 includes a temperature analysis module 41, a signal modulation module 42 and a power regulation module 43 which are communicatively connected to each other, wherein the temperature analysis module 41 is used to analyze the temperature of the air flowing in the air frying cavity 10 detected in real time to obtain the temperature change of the air flowing in the air frying cavity 10; wherein the signal modulation module 42 is used to modulate the parameters of a stepless control signal according to a preset target temperature and the temperature change of the air; wherein the power regulation module 43 is used to respond to the modulated stepless control signal and steplessly adjust the heating power of the air heating device 30 so that the temperature of the air flowing in the air frying cavity 10 is maintained within the upper limit and lower limit of the preset target temperature.

[0148] It is worth noting that the continuously variable control signal is preferably implemented as a pulse wave, and the parameter of the continuously variable control signal includes a duty cycle and / or a phase of the pulse wave.

[0149] In one example of the present invention, the power regulation module 43 can be further used to: in response to the high level of the pulse wave, control the air heating device 30 to be in a high-power working state to generate more heating heat; and in response to the low level of the pulse wave, control the air heating device 30 to be in a low-power working state to generate less heating heat.

[0150] In one example of the present invention, Fig.16As shown, the signal modulation module 42 may include a duty cycle adjustment module 421, wherein the duty cycle adjustment module 421 is used to: in response to the current temperature of the air rising to a first temperature threshold between the upper limit and the lower limit of the preset target temperature, reduce the duty cycle of the pulse wave so that the heating power of the air heating device can be steplessly reduced; and in response to the current temperature of the air decreasing to a second temperature threshold between the upper limit and the lower limit of the preset target temperature, increase the duty cycle of the pulse wave so that the heating power of the air heating device can be steplessly increased.

[0151] In one example of the present invention, Fig.16 As shown, the signal modulation module 42 may include a phase adjustment module 422, wherein the phase adjustment module 422 is used to: in response to the current temperature of the air rising to a first temperature threshold between the upper limit and the lower limit of the preset target temperature, reversely adjust the phase of the pulse wave so that the heating power of the air heating device can be steplessly reduced; and in response to the current temperature of the air decreasing to a second temperature threshold between the upper limit and the lower limit of the preset target temperature, forwardly adjust the phase of the pulse wave so that the heating power of the air heating device can be steplessly increased.

[0152] In one example of the present invention, Figure 6 As shown, when the air heating device 30 is implemented as an electric heater 31, and the electric heater 31 includes an electric heating element 312 and a switching device 313 which are arranged in series in a power supply circuit 311, the power regulation module 43 is further used to: in response to the high level of the pulse wave, instantly turn on the power supply circuit through the switching device 313, so that the current working voltage of the electric heating element 312 is equal to the real-time voltage applied to the electric heating element 312 through the power supply circuit 311, so that the electric heater 31 is in the high-power working state; and in response to the low level of the pulse wave, instantly disconnect the power supply circuit 311 through the switching device 313, so that the current working voltage of the electric heating element 312 is equal to zero, so that the electric heater 31 is in the low-power working state.

[0153] In one example of the present invention, Figure 8As shown, when the air heating device 30 is implemented as an electric heater 31, and the electric heater 31 includes an electric heating element 312 and an adjustable resistor 314 which are arranged in series in the power supply circuit 311, the power regulation module 43 is further used to: in response to the high level of the pulse wave, reduce the resistance value of the adjustable resistor 314 to increase the current working voltage of the electric heating element 312, so that the electric heater 31 is in the high-power working state; in response to the low level of the pulse wave, increase the resistance value of the adjustable resistor 314 to reduce the current working voltage of the electric heating element 312, so that the electric heater 31 is in the low-power working state.

[0154] In one example of the present invention, Fig. 9 As shown, when the air heating device 30 is implemented as an electric heater 31, and the electric heater 31 includes an electric heating element 312 and an adjustable resistor 314 which are arranged in parallel in the power supply circuit 311, the power regulation module 43 is further used to: in response to the high level of the pulse wave, increase the resistance value of the adjustable resistor 314 to increase the current working current of the electric heating element 312, so that the electric heater 31 is in the high-power working state; in response to the low level of the pulse wave, reduce the resistance value of the adjustable resistor 314 to reduce the current working current of the electric heating element 312, so that the electric heater 31 is in the low-power working state.

[0155] In one example of the present invention, Figures 13 to 15 As shown, when the air heating device 30 is implemented as a fluid heat exchanger 32, and the fluid heat exchanger 32 includes a fluid heat exchange element 322 and a flow control device 323 arranged in a heating pipeline 321, the power regulation module 43 is further used to: in response to the high level of the pulse wave, increase the flow rate of the hot fluid provided to the fluid heat exchange element 322 via the heating pipeline 321 through the flow control device 323, so that the fluid heat exchanger 32 is in the high-power working state; in response to the low level of the pulse wave, reduce the flow rate of the hot fluid provided to the fluid heat exchange element 322 via the heating pipeline 321 through the flow control device 323, so that the fluid heat exchange device 323 is in the low-power working state.

[0156] Schematic equipment

[0157] Below, reference Fig.17 To describe an electronic device ( Fig.17 1 shows a block diagram of an electronic device according to an embodiment of the present invention). Fig.17 As shown, the electronic device 60 includes one or more processors 61 and a memory 62 .

[0158] The processor 61 may be a central processing unit (CPU) or other forms of processing units having data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device 60 to perform desired functions.

[0159] The memory 62 may include one or more computer program products, and the computer program products may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, a random access memory (RAM) and / or a cache memory (cache), etc. The non-volatile memory may include, for example, a read-only memory (ROM), a hard disk, a flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 61 may execute the program instructions to implement the methods of the various embodiments of the present invention described above and / or other desired functions.

[0160] In one example, if Fig.17 As shown, the electronic device 60 may further include: an input device 63 and an output device 64, and these components are interconnected via a bus system and / or other forms of connection mechanisms (not shown).

[0161] For example, the input device 63 may be a camera module for collecting image data or video data, etc.

[0162] The output device 64 can output various information to the outside, including classification results, etc. The output device 64 can include, for example, a display, a speaker, a printer, a communication network and a remote output device connected thereto, and the like.

[0163] Of course, to simplify, Fig.17 Only some of the components related to the present invention in the electronic device 60 are shown, and components such as a bus, an input / output interface, etc. are omitted. In addition, according to specific application conditions, the electronic device 60 may also include any other appropriate components.

[0164] It is worth mentioning that Figures 18 to 21 As shown, an embodiment of the present invention can further provide an air frying device, wherein the air frying device can be an air fryer 1 and the above-mentioned stepless temperature control system 40, wherein the stepless temperature control system 40 is configured in the air fryer 1, and the stepless temperature control system 40 is used to minimize the temperature fluctuation amplitude of the air flowing in the air fryer 1.

[0165] Specifically, Fig.18 and Fig. 20As shown, the air fryer 1 may include an air frying cavity 10 for accommodating items to be fried, an air circulation device 20 for driving air to circulate in the air frying cavity 10, and an air heating device 30 for heating the air flowing in the air frying cavity 10. The stepless temperature control system 40 may include a temperature analysis module 41, a signal modulation module 42, and a power adjustment module 43 that are communicatively connected to each other, wherein the temperature analysis module 41 is used to analyze the temperature of the air flowing in the air frying cavity 10 detected in real time to obtain the temperature change of the air flowing in the air frying cavity 10; wherein the signal modulation module 42 is used to modulate the parameters of a stepless control signal according to a preset target temperature and the temperature change of the air; wherein the power adjustment module 43 is used to respond to the modulated stepless control signal and steplessly adjust the heating power of the air heating device 30 so that the temperature of the air flowing in the air frying cavity 10 is maintained within the upper limit and lower limit of the preset target temperature. In this way, after the fried food is placed in the air frying cavity 10, the air heated by the air heating device 30 will contact the fried food under the drive of the air circulation device 20 to complete the air frying process of the fried food. At the same time, the stepless temperature control system 40 maintains the temperature of the air flowing in the air frying cavity 10 within the upper and lower limits of the preset target temperature to improve the air frying effect of the air fryer 1 on the fried food.

[0166] More specifically, the air circulation device 20 of the air fryer 1 may be implemented as, but not limited to, a fan 21 disposed in the air frying cavity 10, wherein when the fan 21 is powered on to turn on, the fan 21 will directly fan the air to circulate in the air frying cavity 10. Of course, in other examples of the present invention, the air circulation device 20 of the air fryer 1 may also be implemented as a fan disposed outside the air frying cavity 10, and the fan is connected to the air frying cavity 10 through an air circulation pipeline, and the air can still be driven by the fan to circulate in the air frying cavity 10. It is understood that the air heating device 30 of the air fryer 1 may be implemented as, but not limited to, the above-mentioned electric heater 31 or the above-mentioned fluid heat exchanger 32, and the present invention will not repeat them.

[0167] It is worth noting that according to the above embodiments of the present invention, Figures 19 to 21As shown, the air frying cavity 10 of the air fryer 1 may include a shell 11 defining an internal cavity 110 and an air frying component 12, wherein the air frying component 12 is disposed on the shell 11, and the air frying component 12 is used to keep the object to be fried in the internal cavity 110, so that the air heated by the air heating device 30 can circulate in the internal cavity 110 of the air frying cavity 10 under the drive of the air circulation device 20 to contact the object to be fried, thereby completing the air frying process of the object to be fried.

[0168] Preferably, the air frying component 12 is detachably arranged on the housing 11, so as to conveniently take and place the item to be fried in the air frying component 12. For example, the air frying component 12 can be installed on the housing 11 by means of, but not limited to, snap fit or door lock.

[0169] More preferably, if Fig. 20 and Fig.21 As shown, the air frying component 12 includes a container 121 having at least one opening 1210, wherein the container 121 is used to hold the object to be fried, and when the container 121 is placed in the internal chamber 110 of the housing 11, the container 121 is connected to at least one of the air circulation device 20 and the air heating device 30 through the at least one opening 1210, so that the air heated by the air heating device 30 can circulate in the container 121 under the drive of the air circulation device 20 to contact the object to be fried, thereby completing the air frying process of the object to be fried. It can be understood that the container 121 can be implemented as a mesh container, such as a frying basket with mesh, etc., but is not limited to it.

[0170] Most preferably, the air frying component 12 further includes a handle 122 disposed on the container 121, wherein when the container 121 is placed in the internal chamber 110 of the shell 11, the handle 122 is exposed outside the internal chamber 110 of the shell 11 to facilitate the user to grasp it.

[0171] It is worth noting that in other examples of the present invention, the air frying component 12 can also be implemented as other types of components such as a rotary grill or a skewer grill, as long as the fried items can be kept in the internal chamber 110 of the shell 11, and the present invention will not go into details about this.

[0172] According to the above embodiments of the present invention, Fig. 20As shown, the fan 21 of the air circulation device 20 generally includes a motor 211 and a fan blade assembly 212, wherein the fan blade assembly 212 is drivably disposed on the motor 211 for rotating under the drive of the motor 211 to fan the air to flow in a circulation manner in the air frying cavity 10.

[0173] It is worth noting that since the temperature of the air heated by the air heating device 30 (hereinafter referred to as hot air) is relatively high, and the hot air will take away the moisture of the fried items to form a high temperature and humid environment in the air frying cavity 10, and the motor 211 of the fan 21 working in a high temperature and humid environment will seriously affect its service life and safety performance, so in order to solve this problem, Fig. 20 As shown, the air frying chamber 10 of the air fryer 1 of the present invention may further include a partition assembly 13, wherein the partition assembly 13 is disposed in the internal chamber 110 of the housing 11 to separate the internal chamber 110 into an upper compartment 1101 and a lower compartment 1102. The motor 211 of the fan 21 is disposed in the upper compartment 1101 of the internal chamber 110, and the fan blade assembly 212 of the fan 21 may include a first fan blade 2121 located in the lower compartment 1102 of the internal chamber 110, for fanning air to flow cyclically in the lower compartment 1102 under the drive of the motor 211. At the same time, the air frying component 12 and the air heating device 30 are both placed in the lower compartment 1102 of the internal chamber 110 to form a high temperature and humid environment in the lower compartment 1102 of the internal chamber 110, so as to ensure that the air frying process of the fried item is completed while the upper compartment 1101 of the internal chamber 110 still maintains a relatively dry environment, which helps to improve the service life and safety performance of the motor 211 of the fan 21.

[0174] Preferably, the partition assembly 13 of the air frying cavity 10 may include an upper partition 131 and a lower partition 132, wherein the upper partition 131 and the lower partition 132 are arranged at intervals in the internal chamber 110 of the shell 11, so as to form a middle partition layer 1103 between the upper compartment 1101 and the lower compartment 1102 through the upper partition 131 and the lower partition 132, that is, the upper partition 131 and the lower partition 132 divide the internal chamber 110 from top to bottom into the upper compartment 1101, the middle partition layer 1103 and the lower compartment 1102, so as to prevent the heat in the lower compartment 1102 from being transferred to the upper compartment 1101 in large quantities through the middle partition layer 1103, thereby preventing the motor 211 of the fan 21 from operating in a high temperature environment.

[0175] More preferably, the fan blade assembly 212 of the fan 21 may further include a second fan blade 2122 located in the middle partition 1103 of the internal chamber 110, which is used to fan the air in the middle partition 1103 under the drive of the motor 211, so as to enhance the heat insulation effect of the middle partition 1103. It is understandable that the first fan blade 2121 and the second fan blade 2122 are both arranged on the output shaft of the motor 211, and the second fan blade 2122 is located between the first fan blade 2121 and the main body of the motor 211, that is, the first fan blade 2121 is located on the outside of the second fan blade 2122, so that the first fan blade 2121 serves as the outer fan blade of the fan 21, and the second fan blade 2122 serves as the inner fan blade of the fan 21.

[0176] It is worth noting that since the lower partition 132 of the partition assembly 13 and the lower portion of the outer shell 11 jointly form the lower compartment 1102 of the internal chamber 110, that is, the lower surface 1321 of the lower partition 132 will serve as the top wall of the lower compartment 1102, the lower surface 1321 of the lower partition 132 will inevitably contact the hot air circulating in the lower partition 132. Therefore, the oil carried in the hot air is very easy to adhere to the lower surface 1321 of the lower partition 132, which is not only difficult to be removed but also easy to breed bacteria, thereby affecting the hygiene and safety of the air frying equipment.

[0177] To solve this problem, Fig. 20 As shown, the air frying chamber 10 of the air fryer 1 of the present invention may further include a non-stick coating 14, wherein the non-stick coating 14 is disposed on the surface of the partition assembly 13, which helps to improve the hygiene of the air frying device. It is understood that the non-stick coating 14 of the present invention may be, but is not limited to, implemented as a Teflon coating or a ceramic coating, etc.

[0178] Preferably, the non-stick coating 14 is disposed on the lower surface 1321 of the lower spacer 132 of the spacer assembly 13 so as to remove oil stains attached to the lower surface 1321 of the lower spacer 132 .

[0179] More preferably, the non-stick coating 14 may also be provided on other wall surfaces of the lower compartment 1102, such as the bottom wall surface and the side wall surface of the lower compartment 1102, so as to further improve the hygiene of the air frying device.

[0180] It is worth noting that in other examples of the present invention, the non-stick coating 14 may also be provided in the air frying cavity 10, and the non-stick coating 14 is located at a position in contact with the air flowing in the internal cavity 110. In other words, the non-stick coating 14 is covered on the portion of the air frying cavity 10 in contact with the air flowing in the internal cavity 110.

[0181] It is worth mentioning that according to the above embodiments of the present invention, Fig.18 and Fig. 20 As shown, the air fryer 1 may further include a temperature sensor 50, wherein the temperature sensor 50 is disposed in the air frying cavity 10, and the temperature sensor 50 is communicatively connected to the temperature analysis module 41 of the stepless temperature control system 40, wherein the temperature sensor 50 is used to detect the temperature of the air flowing in the air frying cavity 10 in real time, and transmit the detected temperature data to the temperature analysis module 41 for analysis. It is understood that the temperature sensor 50 may be, but is not limited to, implemented as an NTC temperature sensor.

[0182] Preferably, the temperature sensor 50 is disposed in the lower compartment 1102 of the internal chamber 110 of the shell 11 and is located adjacent to the air heating device 30 so as to accurately detect the real-time temperature of the air circulating in the lower compartment 1102 .

[0183] It is worth noting that the stepless temperature control system 40 of the air frying device of the present invention can be, but is not limited to, implemented as a single-chip microcomputer or a control chip, wherein the single-chip microcomputer or the control chip is built into the air frying cavity 10 of the air fryer 1, so that the air frying device can be used as an integrated device. Of course, in other examples of the present invention, the stepless temperature control system 40 of the air frying device can also be implemented as a control terminal, wherein the control terminal is externally placed in the air fryer 1, so that the air frying device can be used as a split device. It can be understood that the control terminal is communicatively connected to the air fryer 1, and the air fryer 1 can still be steplessly temperature controlled through the control terminal to achieve a good air frying effect.

[0184] In addition, in one example of the present invention, Figure 6As shown, the air heating device 30 is implemented as an electric heater 31, wherein the electric heater 31 includes an electric heating element 312 and a switch device 313 which are arranged in series in a power supply circuit 311, and the electric heating element 312 is arranged in the air frying cavity 10, wherein the switch device 312 is communicatively connected to the power regulating module 43 of the stepless temperature control system 40, and the power regulating module 43 is further used to control the switch device 312 to instantly turn on or off the power supply circuit 311 in response to the stepless control signal, so that the electric heater 31 switches between the high-power working state and the low-power working state.

[0185] In one example of the present invention, Figure 8 and Fig. 9 As shown, the air heating device 30 is implemented as an electric heater 31, wherein the electric heater 31 includes an electric heating element 312 and an adjustable resistor 314 which are arranged in series or in parallel in the power supply circuit 311, and the electric heating element 312 is arranged in the air frying cavity 10, wherein the adjustable resistor 314 is communicatively connected to the power regulating module 43 of the stepless temperature control system 40, and the power regulating module 43 is further used to respond to the stepless control signal to instantly adjust the resistance value of the adjustable resistor 314, so that the electric heater 31 switches between the high-power working state and the low-power working state.

[0186] In one example of the present invention, Figures 13 to 15 As shown, the air heating device 30 is implemented as a fluid heat exchanger 32, wherein the fluid heat exchanger 32 includes a fluid heat exchange element 322 and a flow control device 323 arranged in a heating pipeline 321, and the fluid heat exchange element 322 is arranged in the air frying cavity 10, wherein the flow control device 323 is communicatively connected to the power adjustment module 43 of the stepless temperature control system 40, and the power adjustment module 43 is further used to respond to the stepless control signal, control the flow control device 323 to instantly adjust the flow of the hot fluid provided to the fluid heat exchange element 322 via the heating pipeline 321, so that the fluid heat exchanger 32 is switched between the high-power working state and the low-power working state.

[0187] The block diagrams of the devices, apparatuses, equipment, and systems involved in the present invention are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The word "such as" used here refers to the phrase "such as but not limited to", and can be used interchangeably with it.

[0188] It should also be noted that in the device, apparatus and method of the present invention, each component or each step can be decomposed and / or reassembled, and such decomposition and / or reassembly should be regarded as an equivalent solution of the present invention.

[0189] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. A stepless temperature control method, characterized in that: Includes steps: S100: analyzing the temperature of air flowing in an air frying cavity of an air fryer detected in real time to obtain a temperature change of the air flowing in the air frying cavity; S200: In response to the current temperature of the air rising to a first temperature threshold between an upper limit and a lower limit of a preset target temperature, reducing the duty cycle of the pulse wave so that the heating power of an air heating device of the air fryer can be steplessly reduced; and in response to the current temperature of the air decreasing to a second temperature threshold between the upper limit and the lower limit of the preset target temperature, increasing the duty cycle of the pulse wave so that the heating power of the air heating device can be steplessly increased; and, In response to the current temperature of the air rising to the first temperature threshold between the upper limit and the lower limit of the preset target temperature, reversely adjusting the phase of the pulse wave so that the heating power of the air heating device can be steplessly reduced; and in response to the current temperature of the air decreasing to the second temperature threshold between the upper limit and the lower limit of the preset target temperature, positively adjusting the phase of the pulse wave so that the heating power of the air heating device can be steplessly increased; S300: In response to the high level of the pulse wave, controlling the air heating device to be in a high power working state to generate more heating heat; and In response to the low level of the pulse wave, the air heating device is controlled to be in a low-power working state to generate less heating heat.

2. The stepless temperature control method according to claim 1, wherein: In step S300: when the air heating device is implemented as an electric heater, and the electric heater includes an electric heating element and a switch device which are arranged in series in a power supply circuit, in response to the high level of the pulse wave, the power supply circuit is instantly turned on through the switch device, so that the current working voltage of the electric heating element is equal to the real-time voltage applied to the electric heating element through the power supply circuit, so that the electric heater is in the high-power working state; And in response to the low level of the pulse wave, the power supply circuit is instantly disconnected through the switching device, so that the current working voltage of the electric heating element is equal to zero, so that the electric heater is in the low-power working state.

3. The stepless temperature control method according to claim 2, wherein: The switching device is implemented as a solid-state relay.

4. The stepless temperature control method according to claim 1, wherein: In the step S300: when the air heating device is implemented as an electric heater, and the electric heater includes an electric heating element and an adjustable resistor which are arranged in series in a power supply circuit, in response to the high level of the pulse wave, the resistance value of the adjustable resistor is reduced to increase the current operating voltage of the electric heating element, so that the electric heater is in the high-power operating state; in response to the low level of the pulse wave, the resistance value of the adjustable resistor is increased to reduce the current operating voltage of the electric heating element, so that the electric heater is in the low-power operating state.

5. The stepless temperature control method according to claim 1, wherein: In step S300: when the air heating device is implemented as an electric heater, and the electric heater includes an electric heating element and an adjustable resistor which are arranged in parallel in the power supply circuit, in response to the high level of the pulse wave, the resistance value of the adjustable resistor is increased to increase the current working current of the electric heating element, so that the electric heater is in the high-power working state; in response to the low level of the pulse wave, the resistance value of the adjustable resistor is decreased to reduce the current working current of the electric heating element, so that the electric heater is in the low-power working state.

6. The stepless temperature control method according to claim 1, wherein: In step S300: when the air heating device is implemented as a fluid heat exchanger, and the fluid heat exchanger includes a fluid heat exchange element and a flow control device arranged in a heating pipeline, in response to the high level of the pulse wave, the flow control device increases the flow of the hot fluid provided to the fluid heat exchange element via the heating pipeline, so that the fluid heat exchanger is in the high-power working state; in response to the low level of the pulse wave, the flow control device decreases the flow of the hot fluid provided to the fluid heat exchange element via the heating pipeline, so that the fluid heat exchange device is in the low-power working state.

7. A stepless temperature control system, wherein the stepless temperature control system is applicable to an air fryer, and the air fryer comprises an air frying cavity, an air circulation device for driving air to circulate in the air frying cavity, and an air heating device for heating the air circulated in the air frying cavity, characterized in that: The stepless temperature control system for an air fryer includes: a temperature analysis module, used to analyze the temperature of the air flowing in the air frying cavity detected in real time, so as to obtain the temperature change of the air flowing in the air frying cavity; a signal modulation module, the signal modulation module comprising a duty cycle adjustment module or a phase adjustment module, the duty cycle adjustment module being used to: in response to the current temperature of the air rising to a first temperature threshold between an upper limit and a lower limit of a preset target temperature, reduce the duty cycle of the pulse wave so that the heating power of an air heating device of the air fryer can be steplessly reduced; and in response to the current temperature of the air decreasing to a second temperature threshold between the upper limit and the lower limit of the preset target temperature, increasing the duty cycle of the pulse wave so that the heating power of the air heating device can be steplessly increased; and, The phase adjustment module is used for: in response to the current temperature of the air rising to the first temperature threshold between the upper limit and the lower limit of the preset target temperature, reversely adjusting the phase of the pulse wave so that the heating power of the air heating device can be steplessly reduced; and in response to the current temperature of the air decreasing to the second temperature threshold between the upper limit and the lower limit of the preset target temperature, positively adjusting the phase of the pulse wave so that the heating power of the air heating device can be increased steplessly; and A power regulating module is used to control the air heating device to be in a high-power working state in response to the high level of the pulse wave to generate more heating heat; and to control the air heating device to be in a low-power working state in response to the low level of the pulse wave to generate less heating heat.

8. The stepless temperature control system according to claim 7, wherein: When the air heating device is implemented as an electric heater, and the electric heater includes an electric heating element and a switch device which are arranged in series in a power supply circuit, the power regulation module is further used to: in response to the high level of the pulse wave, instantly turn on the power supply circuit through the switch device, so that the current working voltage of the electric heating element is equal to the real-time voltage applied to the electric heating element through the power supply circuit, so that the electric heater is in the high-power working state; And in response to the low level of the pulse wave, the power supply circuit is instantly disconnected through the switching device, so that the current working voltage of the electric heating element is equal to zero, so that the electric heater is in the low-power working state.

9. The stepless temperature control system according to claim 7, wherein: When the air heating device is implemented as an electric heater, and the electric heater includes an electric heating element and an adjustable resistor which are arranged in series in a power supply circuit, the power regulation module is further used to: in response to the high level of the pulse wave, reduce the resistance value of the adjustable resistor to increase the current operating voltage of the electric heating element so that the electric heater is in the high-power operating state; in response to the low level of the pulse wave, increase the resistance value of the adjustable resistor to reduce the current operating voltage of the electric heating element so that the electric heater is in the low-power operating state.

10. The stepless temperature control system according to claim 7, wherein: When the air heating device is implemented as an electric heater, and the electric heater includes an electric heating element and an adjustable resistor arranged in parallel in the power supply circuit, the power regulation module is further used to: in response to the high level of the pulse wave, increase the resistance value of the adjustable resistor to increase the current operating current of the electric heating element, so that the electric heater is in the high-power operating state; in response to the low level of the pulse wave, decrease the resistance value of the adjustable resistor to reduce the current operating current of the electric heating element, so that the electric heater is in the low-power operating state.

11. The stepless temperature control system according to claim 7, wherein: When the air heating device is implemented as a fluid heat exchanger, and the fluid heat exchanger includes a fluid heat exchange element and a flow control device arranged in a heating pipeline, the power regulation module is further used to: in response to the high level of the pulse wave, increase the flow rate of the hot fluid provided to the fluid heat exchange element via the heating pipeline through the flow control device, so that the fluid heat exchanger is in the high-power working state; in response to the low level of the pulse wave, reduce the flow rate of the hot fluid provided to the fluid heat exchange element via the heating pipeline through the flow control device, so that the fluid heat exchange device is in the low-power working state.

12. An electronic device, characterized in that include: a processor for executing program instructions; and a memory, wherein the memory is configured to store program instructions executable by the processor to implement a stepless temperature control method, wherein the stepless temperature control method comprises the steps of: S100: analyzing the temperature of air flowing in an air frying cavity of an air fryer detected in real time to obtain a temperature change of the air flowing in the air frying cavity; S200: In response to the current temperature of the air rising to a first temperature threshold between an upper limit and a lower limit of a preset target temperature, reducing the duty cycle of the pulse wave so that the heating power of an air heating device of the air fryer can be steplessly reduced; and in response to the current temperature of the air decreasing to a second temperature threshold between the upper limit and the lower limit of the preset target temperature, increasing the duty cycle of the pulse wave so that the heating power of the air heating device can be steplessly increased; and, In response to the current temperature of the air rising to the first temperature threshold between the upper limit and the lower limit of the preset target temperature, reversely adjusting the phase of the pulse wave so that the heating power of the air heating device can be steplessly reduced; and in response to the current temperature of the air decreasing to the second temperature threshold between the upper limit and the lower limit of the preset target temperature, positively adjusting the phase of the pulse wave so that the heating power of the air heating device can be steplessly increased; S300: In response to the high level of the pulse wave, controlling the air heating device to be in a high power working state to generate more heating heat; and In response to the low level of the pulse wave, the air heating device is controlled to be in a low-power working state to generate less heating heat.

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