Control method and device of electric heating appliance, controller and electric heating appliance

Abstract

The application relates to a control method and device of an electric heating appliance, a controller and the electric heating appliance. A first pulse width modulation signal capable of ensuring stable on-off control of a first switch module is determined and is loaded on a control end of the first switch module to ensure stable on-off control of the first switch module in a state of independent work. Then, a target work parameter of a load is acquired to determine a duty cycle at which a second switch module needs to work to ensure stable work of the load according to the target work parameter. Based on the first pulse width modulation signal and the second pulse width modulation signal determined in the foregoing, a target pulse width modulation signal meeting the stable on-off control of the first switch module and the output power requirement of the second switch module can be determined, and the target pulse width modulation signal is output to the control end of the first switch module to enable the load to work according to the target work parameter.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of operation control of electric heating appliances, and in particular to a control method and device of an electric heating appliance, a controller, an electric heating appliance, a computer storage medium and a computer program product. BACKGROUND

[0002] At present, in the fields of medical treatment, beauty and the like, electric heating appliances such as electronic atomization devices have been widely used because of good aerosol absorption effect generated by the electric heating appliances.

[0003] However, the applicant found in the use process that the electric heating appliances in the prior art are prone to temperature control failure problems such as dry burning or slow heating speed, thereby causing bad user experience. SUMMARY

[0004] Therefore, it is necessary to provide a control method and device of an electric heating appliance, a controller, an electric heating appliance, a computer storage medium and a computer program product, which can accurately control the electric heating appliance to work according to target working parameters.

[0005] In a first aspect, the present application provides a control method of an electric heating appliance, the electric heating appliance comprising a first switching module, a second switching module and a load, a control end of the first switching module being used for inputting a target pulse width modulation signal, an output end of the first switching module being connected with a control end of the second switching module, an input end of the second switching module being used for inputting a power supply voltage, an output end of the second switching module being connected with the load, and an output signal of the first switching module being used for controlling the second switching module to be in a conduction state or an off state.

[0006] The control method of the electric heating appliance comprises the following steps.

[0007] A first pulse width modulation signal is determined; the first pulse width modulation signal is a signal loaded on the control end of the first switching module in a state where the first switching module works independently, so as to drive the first switching module to reliably switch on and off.

[0008] A target working parameter of the load is obtained.

[0009] According to the target working parameter, a second pulse width modulation signal is determined; the second pulse width modulation signal is a signal loaded on the control end of the second switching module to drive the second switching module to be in a conduction state or an off state, so as to make the load work according to the target working parameter.

[0010] According to the first pulse width modulation signal and the second pulse width modulation signal, a target pulse width modulation signal is determined and outputted, so as to make the load work according to the target working parameter.

[0011] The frequency of the first pulse width modulation signal is greater than the frequency of the second pulse width modulation signal.

[0012] In one of the embodiments, the first switch module comprises a first switch tube and a frequency selection network circuit; an input end of the frequency selection network circuit is used to access the target pulse width modulation signal, an output end of the frequency selection network circuit is connected to an input end of the first switch tube, and an output end of the first switch tube is connected to a control end of the second switch module;

[0013] The step of determining the first pulse width modulation signal comprises:

[0014] Obtaining parameters of the frequency selection network circuit;

[0015] According to the parameters of the frequency selection network circuit, the first pulse width modulation signal matched with the frequency selection network circuit is determined.

[0016] In one of the embodiments, according to the first pulse width modulation signal and the second pulse width modulation signal, the target pulse width modulation signal is determined and outputted, which comprises:

[0017] The first pulse width modulation signal and the second pulse width modulation signal are subjected to AND operation, and the target pulse width modulation signal is determined and outputted.

[0018] In one of the embodiments, the target working parameter comprises a target temperature, and according to the target working parameter, the second pulse width modulation signal is determined, which comprises:

[0019] Obtaining an actual temperature of the load;

[0020] According to a difference between the actual temperature and the target temperature, the second pulse width modulation signal is determined.

[0021] In one of the embodiments, according to the difference between the actual temperature and the target temperature, the second pulse width modulation signal is determined, which comprises:

[0022] If the actual temperature is less than the target temperature, then according to the difference between the target temperature and the actual temperature, the duty cycle of the current second pulse width modulation signal is increased to update the second pulse width modulation signal; and / or,

[0023] If the actual temperature is greater than the target temperature, then according to the difference between the actual temperature and the target temperature, the duty cycle of the current second pulse width modulation signal is decreased to update the second pulse width modulation signal;

[0024] The increasing degree is in positive correlation with the difference between the target temperature and the actual temperature;

[0025] The decreasing degree is in positive correlation with the difference between the actual temperature and the target temperature.

[0026] In one of the embodiments, the actual temperature of the load is obtained, which comprises:

[0027] Obtaining a resistance of the load;

[0028] According to the resistance of the load, the actual temperature of the load is determined.

[0029] In a second aspect, a control device of an electric heating appliance is provided, the electric heating appliance comprising a first switching module, a second switching module and a load, a control terminal of the first switching module being configured to receive a target pulse width modulation signal, an output terminal of the first switching module being connected to a control terminal of the second switching module, an input terminal of the second switching module being configured to receive a supply voltage, an output terminal of the second switching module being connected to the load, and an output signal of the first switching module being configured to control the second switching module to be in a conducting state or an off state.

[0030] The control device of the electric heating appliance comprises:

[0031] a first pulse width modulation signal determination module configured to determine a first pulse width modulation signal, the first pulse width modulation signal being a signal loaded on the control terminal of the first switching module in a state in which the first switching module works independently, so as to drive the first switching module to reliably switch between on and off;

[0032] a target working parameter module configured to obtain a target working parameter of the load;

[0033] a second pulse width modulation signal determination module configured to determine a second pulse width modulation signal according to the target working parameter, the second pulse width modulation signal being a signal loaded on the control terminal of the second switching module to drive the second switching module to be in the conducting state or the off state, so as to enable the load to work according to the target working parameter;

[0034] a target pulse width modulation signal determination module configured to determine and output a target pulse width modulation signal according to the first pulse width modulation signal and the second pulse width modulation signal, so as to enable the load to work according to the target working parameter;

[0035] In the present embodiment, the frequency of the first pulse width modulation signal is greater than the frequency of the second pulse width modulation signal.

[0036] In a third aspect, a controller is provided, comprising a memory and a processor, the memory storing a computer program, and the processor implementing the steps of the control method of the electric heating appliance when executing the computer program.

[0037] In a fourth aspect, an electric heating appliance is provided, comprising:

[0038] a first switching module, a control terminal of the first switching module being configured to receive a target pulse width modulation signal;

[0039] a second switching module, a control terminal of the second switching module being connected to an output terminal of the first switching module, an input terminal of the second switching module being configured to receive a supply voltage, and the second switching module being configured to be in a conducting state or an off state under the action of an output signal of the first switching module;

[0040] a load, an output end of the second switch module is connected to the load;

[0041] a controller, an output end of the controller is connected to a control end of the first switch module, and the controller is configured to execute the steps of the control method.

[0042] In one of the embodiments, the controller comprises:

[0043] a sampling circuit, an input end of the sampling circuit is connected to the load;

[0044] a calculation module, an input end of the calculation module is connected to an output end of the sampling circuit, and an output end of the calculation module is connected to the control end of the first switch module, the calculation module is configured to determine the actual temperature of the load according to an output signal of the sampling circuit, and the calculation module is further configured to execute the steps of the control method.

[0045] In one of the embodiments, the first switch module comprises:

[0046] a frequency selection network circuit, an input end of the frequency selection network circuit is connected to an output end of the controller;

[0047] a first switch tube, a control end of the first switch tube is connected to an output end of the frequency selection network circuit, and an output end of the first switch tube is connected to a control end of the second switch module.

[0048] In one of the embodiments, the second switch module comprises:

[0049] a second switch tube, a control end of the second switch tube is connected to an output end of the first switch module, an input end of the second switch tube is configured to be connected to a power supply voltage, and an output end of the second switch tube is connected to the load.

[0050] In a fifth aspect, a computer readable storage medium is provided, and the computer readable storage medium stores a computer program, and the computer program is executed by a processor to implement the steps of the control method.

[0051] The above-mentioned control method, device, controller, electric heating appliance, computer storage medium, and computer program product for an electric heating appliance determine a first pulse-width modulation signal capable of ensuring stable on-off control of the first switch module, which is applied to the control terminal of the first switch module to ensure stable on-off control of the first switch module in a single operating state. Then, by obtaining the target operating parameters of the load, it is determined at what duty cycle the second switch module needs to operate in order for the load to operate according to the target operating parameters to ensure stable operation according to the target operating parameters. Based on the first and second pulse-width modulation signals determined in the previous sequence, a target pulse-width modulation signal that simultaneously satisfies the stable on-off control requirements of the first switch module and the output power requirements of the second switch module can be determined. This target pulse-width modulation signal is then output to the control terminal of the first switch module to ensure that the load operates according to the target operating parameters. To prevent the first switch module from maintaining stable on-off control, the frequency of the determined second pulse-width modulation signal is less than the frequency of the first pulse-width modulation signal. Based on this control implementation, combined with the stable on-off control requirements of the switch module and the power supply requirements of the load, a target pulse width modulation signal that can meet both is determined, avoiding problems such as load overheating or even dry burning, as well as slow heating speed caused by failure of the switch module during the on-off control process, thereby improving the reliability of the working control of the electric heating appliance. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 This is a diagram of an application environment of a method for controlling an electric heating appliance in one embodiment;

[0053] Figure 2 1 is a flow chart of a method for controlling an electric heating appliance in one embodiment;

[0054] Figure 3 FIG1 is a flow chart of a step of determining a first pulse width modulation signal in one embodiment;

[0055] Figures 4a-4c For example Figure 1 Schematic diagram of waveforms of the first pulse width modulation signal, the second pulse width modulation signal and the target pulse width modulation signal determined in the control method of the electric heating appliance under the structure shown;

[0056] Figure 5 FIG1 is a flow chart of a step of determining a second pulse width modulation signal according to target operating parameters in one embodiment;

[0057] Figure 6 FIG1 is a flow chart of a step of determining a second pulse width modulation signal according to a difference between an actual temperature and a target temperature in one embodiment;

[0058] Figure 7 A schematic flow chart of the step of obtaining the actual temperature of a load in one embodiment;

[0059] Figure 8 is a structural block diagram of a control device for an electric heating appliance in one embodiment;

[0060] Figure 9 is a diagram of the internal structure of a controller in one embodiment;

[0061] Figure 10 Schematic diagram of the circuit structure of an electric heating appliance in one embodiment. DETAILED DESCRIPTION

[0062] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0063] The control method provided in the embodiment of the present application can be applied to Figure 1 In the application environment shown, capacitor C1 in the first switch module 102 performs AC conduction and DC isolation, diodes D1 and D2 control the current flow direction, and an integrating circuit consisting of resistors R1, R2, and capacitor C2 integrates the input target pulse width modulation signal. When the base voltage of the first switch tube Q1 reaches the conduction condition, Q1 is turned on, and the collector of Q1 outputs current, which is transmitted to the gate of the second switch tube Q2 through resistor R3 in the second switch module 104. The source of Q2 is connected to the power supply voltage VCC_BAT, and the drain of Q2 is connected to the load 106 that needs power. When the conduction condition of Q2 is met, Q2 is turned on, and the power supply voltage VCC_BAT is applied to the load (for example, a heating component) through resistor R4 to power the load.

[0064] By adjusting the frequency of the input target pulse-width modulation signal, the conduction variation of Q1 and the duration of Q2's conduction and shutdown can be changed, thereby changing the load's operating power and achieving precise control of the load power, so that the load operates at the desired power. Furthermore, by determining a first pulse-width modulation signal (PWM signal) that meets the conduction requirements of Q1 when the first switch module 102 is operating alone, and then determining a second pulse-width modulation signal (PWM signal) to be applied by the second switch module 104 based on the heating power required by the heating component, a combination of the two can further determine a PWM signal that meets the requirements of Q1 and Q2, which is ultimately applied to the input terminal of capacitor C1. This allows the load to be precisely controlled to operate according to target operating parameters while stably controlling the on-off of each switch tube. This can avoid load overload or slow operating power increase caused by failure in switch on-off control. For example, when the load is a heating component, this can prevent the heating component from drying out or rising too slowly.

[0065] The control method provided by the embodiments of the present application can be applied to an aerosol generating device. Based on the heating requirement, the heating power of the heating assembly can be quickly adjusted to meet the requirement, so that the heating assembly quickly reaches the target temperature. Based on the control method, the problem of dry burning of the heating assembly caused by the out-of-control of the first switch module (the first switch tube Q1) and the second switch module (the second switch tube Q2) can be avoided.

[0066] As Figure 1 shown in the structure, under the control of a single PWM wave input to the base of Q1, for example, the determination of the PWM wave is directly according to the on-off control requirement of Q2, there is a risk that Q1 cannot be accurately turned on. In order to meet the temperature requirement, the PWM wave input to the base of Q1 needs to be adjusted multiple times to control the change frequency of the power-on and power-off of the load, and temperature testing is performed, which causes the time delay of the heating assembly and other loads to reach the target temperature, and the control precision is low. In addition, the heating assembly and other loads are also prone to dry burning and other problems, thereby causing a poor user experience.

[0067] Based on the above reasons, in one embodiment, a control method of an electric heating appliance is provided. The electric heating appliance can be an aerosol generating device or other electric heating appliances. When the electric heating appliance is an aerosol generating device, the load can be a heating assembly, and the signal output by the output end of the second switch module is loaded on the heating assembly, which can determine the heating temperature of the heating assembly. By executing the steps of the control method in the embodiment, the target pulse width modulation signal is regulated and controlled, and the heating temperature of the heating assembly can be accurately controlled to be stable at the target temperature, so as to avoid the problems of dry burning of the heating assembly or slow heating speed.

[0068] As Figure 1 shown, the electric heating appliance includes a first switch module 102, a second switch module 104, and a load 106. The control end of the first switch module 102 is used to input a target pulse width modulation signal. The output end of the first switch module 102 is connected to the control end of the second switch module 104. The input end of the second switch module 104 is used to input a power supply voltage. The output end of the second switch module 104 is connected to the load 106. The output signal of the first switch module 102 is used to control the second switch module 104 to be in a conduction state or an off state.

[0069] As Figure 2 shown, the control method of the electric heating appliance includes:

[0070] S202, determine a first pulse width modulation signal; the first pulse width modulation signal is a signal loaded on the control end of the first switch module in the state that the first switch module works independently, to drive the first switch module to reliably switch on or off. In the case that the circuit structure and device selection of the electric heating appliance are determined, the PWM waveform that the first switch module reliably switches on or off can be determined, and the PWM waveform is the first pulse width modulation signal given here.

[0071] S204, obtain a target working parameter of the load. The target working parameter is a parameter of the working state in which the user expects the load to be in. For example, the target working parameter can be a target temperature, a target power, a target current, a target voltage, etc. expected by the user.

[0072] S206, determine a second pulse width modulation signal according to the target working parameter; the second pulse width modulation signal is a signal loaded on the control end of the second switch module to drive the second switch module to switch on or off, so that the load works according to the target working parameter. In the case that other conditions are determined, the actual working parameter of the load is mainly determined by the electric signal loaded on the output end of the second switch module. By changing the duty cycle of the second pulse width modulation signal, the on and off time of the second switch module can be changed, so as to adjust the power of the electric signal loaded on the load.

[0073] S208, determine and output a target pulse width modulation signal according to the first pulse width modulation signal and the second pulse width modulation signal, so that the load works according to the target working parameter. The frequency of the first pulse width modulation signal is greater than the frequency of the second pulse width modulation signal. In the case that the frequency of the first pulse width modulation signal is less than the frequency of the second pulse width modulation signal, the first switch module cannot reliably switch on, so for the above control method, the determination of the first pulse width modulation signal and the second pulse width modulation signal, and the determination process of the target pulse width modulation signal are based on this constraint condition.

[0074] Specifically, by determining a first pulse width modulation signal capable of ensuring stable on-off control of the first switch module, the first pulse width modulation signal is used to be loaded on the control end of the first switch module to ensure stable on-off control of the first switch module in a state of independent operation of the first switch module. Then, by obtaining a target working parameter of the load, it is determined that, in order to make the load work according to the target working parameter, the second switch module needs to work at what duty ratio to ensure that the load works stably according to the target working parameter. Based on the first pulse width modulation signal and the second pulse width modulation signal determined in the foregoing, a target pulse width modulation signal that can meet the stable on-off control of the first switch module and the output power requirement of the second switch module at the same time can be determined, and the target pulse width modulation signal is output to the control end of the first switch module to make the load work according to the target working parameter. To avoid stable conduction control of the first switch module, the frequency of the determined second pulse width modulation signal is less than the frequency of the first pulse width modulation signal. Based on this control implementation, in combination with the stable on-off control requirement of the switch module and the power supply requirement of the load, a target pulse width modulation signal capable of meeting both requirements is determined, thereby avoiding problems such as over-temperature or even dry burning of the load and slow heating speed caused by failure of the on-off control process of the switch module, and improving the reliability of the working control of the electric heating appliance.

[0075] In one of the embodiments, the first switch module includes a first switch tube and a frequency selection network circuit; an input end of the frequency selection network circuit is used to access the target pulse width modulation signal, an output end of the frequency selection network circuit is connected to an input end of the first switch tube, and an output end of the first switch tube is connected to a control end of the second switch module.

[0076] The step of determining the first pulse width modulation signal includes the following steps, as shown in Figure 3

[0077] S302, parameters of the frequency selection network circuit are obtained.

[0078] S304, according to the parameters of the frequency selection network circuit, a first pulse width modulation signal with a frequency matched with the frequency selection network circuit is determined.

[0079] The pulse width modulation signal meeting the reliable conduction or turn-off of the first switch module is determined by the frequency selection network. Based on the conduction voltage and the off voltage required for the first switch module to remain conduction or turn-off, the amplitude of the first pulse width modulation signal can be determined. On this basis, in a specific frequency range, for example, under the constraint condition that the frequency of the first pulse width modulation signal is greater than the frequency of the second pulse width modulation signal, a specific frequency range of the first pulse width modulation signal is determined. In the specific frequency range, based on the parameters of the frequency selection network circuit, the reliable conduction and turn-off of the first switch module at the specific frequency are realized.

[0080] To help those skilled in the art better understand the scheme, see Figure 1 ​In the circuit structure shown, the first pulse-width modulation signal input to the control terminal of the first switch tube Q1 is determined by the frequency selection network circuit composed of C1 / D1 / D2 / R1 / R2 / C2. According to the required frequency range (which conforms to the above-mentioned magnitude relationship with the frequency of the second pulse-width modulation signal), the parameters of C1 / D1 / D2 / R1 / R2 / C2 are appropriately matched to achieve reliable transmission of the electrical signal to the second switch module within a specific frequency range, thereby stably driving the second switch module to be turned on and off.

[0081] For electric heating appliances such as aerosol generating devices, during the confirmation process of the target pulse width modulation signal of the heating component and other loads, when the frequency of the first pulse width modulation signal is not less than 5 times the frequency of the second pulse width modulation signal, stable on-off control of the two can be guaranteed.

[0082] In one embodiment, determining and outputting a target pulse width modulation signal according to the first pulse width modulation signal and the second pulse width modulation signal includes:

[0083] An AND operation is performed on the first pulse width modulation signal and the second pulse width modulation signal to determine and output a target pulse width modulation signal.

[0084] The first pulse width modulation signal and the second pulse width modulation signal can be ANDed by using an AND logic device or software, and the result of the ANDed operation is used as the target pulse width modulation signal, such as Figures 4a-4c Based on Figure 1 Under the structure, for a certain load target working parameter, determine its Figure 4a The first pulse width modulation signal shown and Figure 4b The second pulse width modulation signal shown in FIG. 1 is obtained based on these two signals. Figure 4c The target pulse width modulation signal shown in FIG. Figure 4b During the high level period shown, the first switch tube Q1 is normally turned on, transmitting the electrical signal to the gate of the second switch tube Q2, triggering Q2 to turn on, and the supply voltage acts on the drain of Q2 through the source of Q2, loading on the load and supplying power to the load. During the continuous low level interval of the target pulse width modulation signal (corresponding to Figure 4b During the low- to medium-level time period), the first switch tube Q1 is turned off by the low level introduced to the base, disconnecting the electrical signal transmission to the control terminal of Q2. At this time, Q2 is also turned off, and the power supply voltage cannot be loaded to the load, causing the load to lose power. By loading the target pulse width modulation signal for multiple cycles, the power output by Q2 to the load can be accurately controlled. In the entire power regulation process, there is no need to worry about control failure caused by the target pulse width modulation signal not being compatible with the on / off condition lock of the first switch tube Q1 and the second switch tube Q2, and the reliability is high. It should be noted that Figure 4c The middle dotted line indicates omission, which means the waveform in the middle is consistent with the waveforms before and after.Figure 4c The waveform in the Ton period is as shown in the figure Figure 4a The waveform in the Toff period is as shown in the figure Figure 4b The waveform in the Toff period is as shown in the figure

[0085] In one embodiment, the target operating parameter includes a target temperature, and the second pulse width modulation signal is determined according to the target operating parameter, as shown in the figure Figure 5 The second pulse width modulation signal includes:

[0086] S502, an actual temperature of the load is obtained. The actual temperature of the load refers to temperature data reflecting the current heat generation of the load. The actual temperature of the load can be measured by a temperature sensor. When the load is a heat generating device, the resistance value and the temperature of the load are correlated. In this case, the temperature can also be determined based on resistance measurement. In this implementation, a temperature sensor does not need to be introduced, thereby saving cost.

[0087] S504, a second pulse width modulation signal is determined according to a difference between the actual temperature and the target temperature.

[0088] The purpose of the regulation is to stabilize the load at the target temperature, so as to heat the aerosol generating substrate and other substances at a constant temperature. The load can also be stabilized at the target temperature to provide stable heating. Based on the second pulse width modulation signal loaded in the second switch module in advance, the output power loaded on the load can be regulated by increasing or decreasing the duty cycle of the second pulse width modulation signal, thereby changing the operating temperature of the load. Therefore, the second pulse width modulation signal can be re-determined according to the difference between the actual temperature and the target temperature. Based on the second pulse width modulation signal determined in this way, the target pulse width modulation signal obtained by performing logical operation on the first pulse width modulation signal and the target pulse width modulation signal can quickly control the load to adjust to the target temperature, has high control precision, and has fast response.

[0089] In one embodiment, the second pulse width modulation signal is determined according to a difference between the actual temperature and the target temperature, as shown in the figure Figure 6 The second pulse width modulation signal includes:

[0090] S602, if the actual temperature is less than the target temperature, the duty cycle of the current second pulse width modulation signal is increased to update the second pulse width modulation signal according to a difference between the target temperature and the actual temperature; and / or,

[0091] S604, if the actual temperature is greater than the target temperature, the duty cycle of the current second pulse width modulation signal is decreased to update the second pulse width modulation signal according to a difference between the target temperature and the actual temperature; wherein the degree of increase is in a positive correlation with the difference between the target temperature and the actual temperature; and the degree of decrease is in a positive correlation with the difference between the actual temperature and the target temperature.

[0092] The greater the difference from the target temperature, the greater the amount of duty cycle adjustment required, so based on the positive correlation, in the case where the actual temperature is less than the target temperature, the amount by which the duty cycle of the current second pulse width modulation signal needs to be increased is determined according to the difference greater than 0 between the target temperature and the actual temperature, and the second pulse width modulation signal is updated based on the amount that needs to be increased, as a new second pulse width modulation signal to determine a new target pulse width modulation signal for loading on the control end of the first switch module. After the new target pulse width modulation signal is loaded on the control end of the first switch module, the second switch module can extend the time for which the second switch module is turned on according to the increased duty cycle, thereby increasing the power output by the second switch module to the load, so that the operating power of the load is increased and the temperature quickly reaches the target temperature. Similarly, for the case where the actual temperature is greater than the target temperature, a second pulse width modulation signal with a reduced duty cycle can be determined first, and then based on the updated second pulse width modulation signal, the step of determining and outputting a target pulse width modulation signal according to the first pulse width modulation signal and the second pulse width modulation signal is re-executed, i.e. this step is executed to determine a new target pulse width modulation signal after each update of the second pulse width modulation signal, to change the power of the load, so that the temperature of the load quickly stabilizes at the target temperature.

[0093] This adjustment can be continuously performed based on the target temperature and the actual temperature when the target temperature is constant. In addition, when the target temperature or other target operating parameters change, the control method provided in the embodiments of the present application can be used to control the load to quickly operate at the new target operating parameters while ensuring that the first switch module and the second switch module are stably turned on or turned off.

[0094] In one of the embodiments, the actual temperature of the load is obtained, as shown in Figure 7 , comprising:

[0095] S702, obtaining the resistance of the load;

[0096] S704, determining the actual temperature of the load according to the resistance of the load.

[0097] For loads such as heating assemblies whose resistance also increases as the temperature rises, there is a certain relationship between the resistance and the actual temperature of the load, which can be obtained in advance based on temperature and resistance test experiments. Based on this, during operation, the resistance of the load, i.e. the resistance value, can be obtained, and based on the resistance and the resistance-actual temperature relationship, the actual temperature of the load can be determined. Many electric heating appliances now have voltage and current sampling circuits, and based on this, the resistance of the load can be calculated based on the sampled voltage and current using Ohm's law. Without further adding a temperature sensor to measure the temperature, the original circuit structure can be used to reduce product costs.

[0098] Of course, the actual temperature of the load can also be obtained by a temperature sensor, which is not described herein.

[0099] It should be understood that, although each step in the flowchart involved in each embodiment as described above is shown in sequence according to the arrow, these steps are not necessarily executed in the order indicated by the arrow. Unless otherwise specified herein, the execution of these steps is not strictly limited in sequence, and these steps can be executed in other orders. Moreover, at least part of the steps in the flowchart involved in each embodiment as described above can include multiple steps or stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily sequential, but can be alternately executed with at least part of other steps or stages or steps or stages in other steps.

[0100] Based on the same inventive concept, the embodiments of the present application also provide a control device of an electric heating appliance for implementing the control method of the electric heating appliance as described above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme described in the above method, so the specific limitations in one or more control device embodiments of the electric heating appliance provided below can refer to the limitations of the control method of the electric heating appliance described above, which will not be described herein.

[0101] In one embodiment, as shown in Figure 8 A control device of an electric heating appliance is provided, the electric heating appliance comprising a first switching module, a second switching module and a load, a control end of the first switching module being configured to receive a target pulse width modulation signal, an output end of the first switching module being connected to a control end of the second switching module, an input end of the second switching module being configured to receive a supply voltage, an output end of the second switching module being connected to the load, and an output signal of the first switching module being configured to control the second switching module to be in a conducting state or an off state.

[0102] In one embodiment, the control device of the electric heating appliance comprises:

[0103] A first pulse width modulation signal determination module 802 is configured to determine a first pulse width modulation signal, the first pulse width modulation signal being a signal loaded on the control end of the first switching module in a state in which the first switching module works independently, so as to drive the first switching module to perform reliable on-off switching.

[0104] A target working parameter module 804 is configured to obtain a target working parameter of the load.

[0105] The second pulse width modulation signal determination module 806 is configured to determine a second pulse width modulation signal according to the target working parameter; the second pulse width modulation signal is a signal loaded on a control end of the second switch module to drive the second switch module to be turned on or turned off, so that the load works according to the target working parameter.

[0106] The target pulse width modulation signal determination module 808 is configured to determine and output a target pulse width modulation signal according to the first pulse width modulation signal and the second pulse width modulation signal, so that the load works according to the target working parameter.

[0107] The frequency of the first pulse width modulation signal is greater than the frequency of the second pulse width modulation signal.

[0108] The above-mentioned terms can be referred to the descriptions in the method embodiments, which will not be repeated here.

[0109] The first pulse width modulation signal determination module 802 determines the first pulse width modulation signal and sends it to the target pulse width modulation signal determination module 806. The first pulse width modulation signal is a signal loaded on a control end of the first switch module to drive the first switch module to be reliably turned on or turned off in a state where the first switch module works independently. Then the target working parameter module 804 obtains the target working parameter of the load and sends it to the second pulse width modulation signal determination module 806. The second pulse width modulation signal determination module 806 determines the second pulse width modulation signal according to the target working parameter and sends it to the target pulse width modulation signal determination module 808. The second pulse width modulation signal is a signal loaded on a control end of the second switch module to drive the second switch module to be turned on or turned off, so that the load works according to the target working parameter. Finally, the target pulse width modulation signal determination module 808 determines and outputs the target pulse width modulation signal according to the first pulse width modulation signal and the second pulse width modulation signal, so that the load works according to the target working parameter.

[0110] In one embodiment, the first switch module includes a first switch tube and a frequency selection network circuit; an input end of the frequency selection network circuit is configured to access the target pulse width modulation signal, an output end of the frequency selection network circuit is connected to an input end of the first switch tube, and an output end of the first switch tube is connected to a control end of the second switch module.

[0111] The first pulse width modulation signal determination module 802 includes:

[0112] The frequency selection network circuit parameter acquisition unit is configured to acquire parameters of the frequency selection network circuit.

[0113] The first pulse width modulation signal calculation unit is configured to determine the first pulse width modulation signal with a frequency matched with the frequency selection network circuit according to the parameters of the frequency selection network circuit.

[0114] In one embodiment, the target pulse width modulation signal determination module 808 includes:

[0115] The target pulse width modulation signal determination unit is configured to perform an AND operation on the first pulse width modulation signal and the second pulse width modulation signal, determine a target pulse width modulation signal, and output the target pulse width modulation signal.

[0116] In one of the embodiments, the target operating parameter comprises a target temperature, and the second pulse width modulation signal determination module 806 comprises:

[0117] The actual temperature acquisition unit is configured to acquire an actual temperature of the load.

[0118] The second pulse width modulation signal determination unit is configured to determine the second pulse width modulation signal according to a difference between the actual temperature and the target temperature.

[0119] In one of the embodiments, the second pulse width modulation signal determination unit comprises a power up unit and a power down unit, and wherein:

[0120] The power up unit is configured to, when the actual temperature is less than the target temperature, increase a duty cycle of the current second pulse width modulation signal according to the difference between the target temperature and the actual temperature to update the second pulse width modulation signal; and / or,

[0121] The power down unit is configured to, when the actual temperature is greater than the target temperature, decrease the duty cycle of the current second pulse width modulation signal according to the difference between the actual temperature and the target temperature to update the second pulse width modulation signal.

[0122] The increasing degree is in a positive correlation with the difference between the target temperature and the actual temperature.

[0123] The decreasing degree is in a positive correlation with the difference between the actual temperature and the target temperature.

[0124] In one of the embodiments, the actual temperature acquisition unit comprises:

[0125] The resistance acquisition unit is configured to acquire a resistance of the load.

[0126] The temperature determination unit is configured to determine the actual temperature of the load according to the resistance of the load.

[0127] The above-mentioned modules in the control device of the electric heating appliance can be realized by software, hardware, or a combination thereof. The above-mentioned modules can be embedded in or independent of a processor in the controller in a hardware form, or stored in a memory in the controller in a software form, so as to be called and executed by the processor.

[0128] In one of the embodiments, a controller is provided, which can be a server, and an internal structure diagram of the controller can be as shown in Figure 9As shown. The controller includes a processor, a memory, and a network interface connected via a system bus. The processor of the controller is used to provide computing and control capabilities. The memory of the controller includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The database of the controller is used to store data such as a first pulse width modulation signal. The network interface of the controller is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, a control method for an electric heating appliance is implemented.

[0129] Those skilled in the art will understand that Figure 9 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the controller to which the solution of the present application is applied. The specific controller may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0130] The present application also provides a controller comprising a memory and a processor, wherein the memory stores a computer program, wherein when the processor executes the computer program, the steps of the above-described electric heating appliance control method are implemented and the corresponding beneficial effects are achieved. The controller can be an integrated chip or an integrated circuit composed of logic devices.

[0131] The present application also provides an electric heating device, such as Figure 1 As shown, it includes: a first switch module, a second switch module, a load, and a controller. Among them, the control end of the first switch module is used to access the target pulse width modulation signal. The control end of the second switch module is connected to the output end of the first switch module, the input end of the second switch module is used to access the power supply voltage, and the second switch module is used to be in the on state or the off state under the action of the output signal of the first switch module. The load is connected to the output end of the second switch module. And the output end of the controller is connected to the control end of the first switch module, forming a circuit as shown in FIG. Figure 1 The circuit structure shown is used to execute the steps of the above control method during the operation of the controller.

[0132] The controller, by executing the above method, determines a first pulse width modulation signal capable of ensuring stable on-off control of the first switch module, thereby ensuring stable on-off control of the first switch module in a state where the first switch module works alone. Then, by obtaining a target working parameter of the load, the controller determines the duty cycle at which the second switch module needs to work in order to ensure stable working of the load according to the target working parameter. Based on the first pulse width modulation signal and the second pulse width modulation signal determined in the foregoing, a target pulse width modulation signal that meets both the stable on-off control of the first switch module and the output power requirement of the second switch module can be determined, and the controller outputs the target pulse width modulation signal to the control end of the first switch module, so that the load works according to the target working parameter.

[0133] It should be emphasized that, in addition to the specific selection examples in Figure 1 , the first switch Q1 therein can also be selected from other types of switch tubes, and the accompanying drawings are intended to help those skilled in the art understand the implementation of the scheme and do not limit the protection scope of the present application. The same applies to the selection of other specific components.

[0134] In one of the embodiments, the controller includes a sampling circuit 1002 and a computing module 128. The input end of the sampling circuit 1002 is connected with the load 106. The input end of the computing module 128 is connected with the output end of the sampling circuit 1002, and the output end is connected with the control end of the first switch module, for determining the actual temperature of the load 106 according to the output signal of the sampling circuit 1002, and further for executing the steps of the above control method.

[0135] The sampling circuit 1002 can be implemented in the circuit structure as shown in Figure 10 . In this way, no temperature sensor needs to be installed. During working, the computing module 128 in the controller 108 executes the processing procedure of the above method, calculates the resistance according to the working voltage and working current sampled by the sampling circuit 1002, and then determines the actual temperature according to the relationship between the resistance and the temperature. The controller re-determines a new second pulse width modulation signal according to the difference between the actual temperature and the target temperature, and further determines a new target pulse width modulation signal output to the control end of the first switch module, thereby achieving adjustment of the working power of the load 106 and changing the temperature thereof.

[0136] When the sampling circuit 1002 is as shown in Figure 10 , the calculation of the resistance can be implemented as follows:

[0137] The computing module outputs the target pulse width modulation signal to the first switch module 102, and under the action of the target pulse width modulation signal, the second switch module 104 works according to Figure 4bAs shown in the waveform, when the second switch module 104 is turned on or off, during the time period when the second switch module 104 is turned on, the voltage VCC_BAT of the power supply 1004 is loaded on the load 106, and the load 106 is electrically heated. The voltage sampling circuit 1022 collects the working voltage of the load 106 when it is heated, and the current sampling circuit 1042 samples the working current of the load 106 when it is heated, and transmits them to the calculation module through the corresponding voltage analog-to-digital conversion module 148 and current analog-to-digital conversion module 168 respectively. The calculation module calculates the real-time resistance of the load 106 based on Ohm's law, the working voltage and the working current, and determines the actual temperature of the load 106 according to the real-time resistance.

[0138] In one embodiment, the first switching module includes a frequency-selective network circuit and a first switching transistor. The input of the frequency-selective network circuit is connected to the output of the controller; the control terminal of the first switching transistor is connected to the output of the frequency-selective network circuit, and the output of the first switching transistor is connected to the control terminal of the second switching module. As described in the above method embodiment, the parameters of the frequency-selective network circuit are used to determine a first pulse-width modulated signal adapted to its frequency. Furthermore, when the parameters of the frequency-selective network circuit are selected, the duty cycle range and frequency of the second pulse-width modulated signal can also be determined based on the upper and lower limits of the load's operating power. Based on the frequency of the second pulse-width modulated signal, a frequency range of the first pulse-width modulated signal is determined, ensuring that the frequency of the first pulse-width modulated signal is greater than that of the second pulse-width modulated signal. Based on this specific frequency range, a frequency-selective network circuit adapted to this specific frequency range is then designed.

[0139] For example, Figure 1 Under the structure and device selection shown, when Figure 4a When the waveform uses 5kHz (the optimal operating frequency of the first switch tube Q1 under a certain selection), the capacitor C1 can be 0.1uF, the resistor R1 can be 470Ω, the resistor R2 can be 51kΩ, and the capacitor C2 can be 0.22uF, which can achieve reliable control of the circuit.

[0140] In this circuit, the larger the value of capacitor C1, the better in theory. However, due to economic considerations, a smaller value of capacitor C1 can be selected when the frequency of the first pulse width modulation signal is high. For example, when the first pulse width modulation signal is 5kHz, Figure 1 In the circuit structure shown, a capacitor in the range of 0.01uF to 1uF can be selected as C1, which can take into account both economy and stability of the on-off control of the first switch tube.

[0141] R1 / R2 / C2 constitute integral circuit, if the value of capacitor C2 is large, it will cause the large delay of the on-off action of the second switch tube Q2, if it is very large, the second switch tube Q2 cannot normally output, but if the capacitor C2 is too small, it will cause the output signal of the second switch tube Q2 to produce a large ripple, and even when the load needs to be continuously output high level signal, the output signal of the second switch tube Q2 is no longer continuous.

[0142] The frequency selection network circuit determined by the above design idea can not only ensure that the conduction of the first switch tube Q1 is completely controllable, but also ensure the accurate action of the second switch tube Q2, and the accurate output of the second switch tube Q2 realizes the waveform required by the load Figure 4b , thereby ensuring the accurate temperature control of the heat generating body and preventing the appliance from dry burning or slow heating. When applied to the control process of the electric heating appliance of the aerosol generating device, the atomization effect can be greatly optimized, and the customer experience can be improved.

[0143] By appropriately matching the parameters of C1 / D1 / D2 / R1 / R2 / C2, the optimal working frequency of the first switch tube can be modified.

[0144] Among them, the first switch tube can be an NPN transistor as shown in Figure 1 , or a MOS tube or other types of compound MOS tubes with the same conduction and off characteristics can be used instead, and the drawings of the present application do not limit it.

[0145] In one embodiment, the second switch module includes a second switch tube. The control end of the second switch tube is connected to the output end of the first switch module, the input end of the second switch tube is used to access the power supply voltage, and the output end of the second switch tube is connected to the load.

[0146] The second switch tube can be a PMOS tube as shown in Figure 1 , and is connected according to the connection method shown in the figure. Of course, other transistors or compound field effect tubes with the same conduction and off characteristics as PMOS tubes can also be used instead. In order to improve the working stability, a resistor R3 can be connected between the output end of the first switch tube Q1 and the control end of the second switch tube Q2 as shown in Figure 1 . In order to maintain the stable work of the second switch tube Q2, a resistor R4 can be connected between the source and the gate of the second switch tube.

[0147] The embodiment of the present application also provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to realize the following steps:

[0148] S202, determine a first pulse width modulation signal; the first pulse width modulation signal is a signal loaded on a control end of the first switch module in a state that the first switch module works independently, to drive the first switch module to reliably switch on and off.

[0149] S204, obtain a target working parameter of the load. The target working parameter is a parameter of a working state in which the user expects the load to be.

[0150] S206, according to the target working parameter, determine a second pulse width modulation signal; the second pulse width modulation signal is a signal loaded on a control end of the second switch module to drive the second switch module to turn on or turn off, so that the load works according to the target working parameter.

[0151] S208, according to the first pulse width modulation signal and the second pulse width modulation signal, determine and output a target pulse width modulation signal, so that the load works according to the target working parameter.

[0152] In one embodiment, the computer program is further implemented when executed by the processor to implement the following steps:

[0153] S302, obtain a parameter of the frequency selection network circuit.

[0154] S304, according to the parameter of the frequency selection network circuit, determine a first pulse width modulation signal whose frequency matches the frequency selection network circuit.

[0155] In one embodiment, the computer program is further implemented when executed by the processor to implement the following steps:

[0156] The first pulse width modulation signal and the second pulse width modulation signal are subjected to an AND operation to determine and output the target pulse width modulation signal.

[0157] In one embodiment, the computer program is further implemented when executed by the processor to implement the following steps:

[0158] S502, obtain an actual temperature of the load. The actual temperature of the load refers to temperature data reflecting the current heat generation of the load.

[0159] S504, according to a difference between the actual temperature and a target temperature, determine a second pulse width modulation signal.

[0160] In one embodiment, the computer program is further implemented when executed by the processor to implement the following steps:

[0161] S602, if the actual temperature is less than the target temperature, according to a difference between the target temperature and the actual temperature, increase a duty cycle of the current second pulse width modulation signal to update the second pulse width modulation signal; and / or,

[0162] S604, if the actual temperature is greater than the target temperature, reducing the duty cycle of the current second pulse width modulation signal according to the difference between the actual temperature and the target temperature to update the second pulse width modulation signal;

[0163] wherein the increasing degree is positively correlated with the difference between the target temperature and the actual temperature; and the decreasing degree is positively correlated with the difference between the actual temperature and the target temperature.

[0164] In one embodiment, the computer program, when executed by the processor, further implements the following steps:

[0165] S702, obtaining the resistance of the load;

[0166] S704, determining the actual temperature of the load according to the resistance of the load.

[0167] In one embodiment, a computer program product is provided, comprising a computer program which, when executed by the processor, implements the following steps:

[0168] S202, determining a first pulse width modulation signal; the first pulse width modulation signal is a signal loaded on the control end of the first switching module to drive the first switching module to reliably switch on and off in the state that the first switching module works independently.

[0169] S204, obtaining a target working parameter of the load. The target working parameter is a parameter of the working state in which the user expects the load to be in.

[0170] S206, determining a second pulse width modulation signal according to the target working parameter; the second pulse width modulation signal is a signal loaded on the control end of the second switching module to drive the second switching module to turn on or turn off, so that the load works according to the target working parameter.

[0171] S208, determining and outputting a target pulse width modulation signal according to the first pulse width modulation signal and the second pulse width modulation signal, so that the load works according to the target working parameter.

[0172] In one embodiment, the computer program, when executed by the processor, further implements the following steps:

[0173] S302, obtaining a parameter of the frequency selection network circuit.

[0174] S304, determining a first pulse width modulation signal whose frequency matches the frequency selection network circuit according to the parameter of the frequency selection network circuit.

[0175] In one embodiment, the computer program, when executed by the processor, further implements the following steps:

[0176] performing an AND operation on the first pulse width modulation signal and the second pulse width modulation signal to determine and output the target pulse width modulation signal.

[0177] In one embodiment, the computer program, when executed by the processor, further implements the following steps:

[0178] S502, acquiring an actual temperature of the load. The actual temperature of the load refers to temperature data reflecting the current heat generation of the load.

[0179] S504, determining a second pulse width modulation signal according to a difference between the actual temperature and the target temperature.

[0180] In one embodiment, the computer program, when executed by the processor, further implements the following steps:

[0181] S602, if the actual temperature is less than the target temperature, increasing a duty cycle of the current second pulse width modulation signal to update the second pulse width modulation signal according to a difference between the target temperature and the actual temperature; and / or,

[0182] S604, if the actual temperature is greater than the target temperature, decreasing the duty cycle of the current second pulse width modulation signal to update the second pulse width modulation signal according to a difference between the target temperature and the actual temperature.

[0183] The increasing degree is in a positive correlation with the difference between the target temperature and the actual temperature, and the decreasing degree is in a positive correlation with the difference between the actual temperature and the target temperature.

[0184] In one embodiment, the computer program, when executed by the processor, further implements the following steps:

[0185] S702, acquiring an electrical resistance of the load;

[0186] S704, determining an actual temperature of the load according to the electrical resistance of the load.

[0187] It should be noted that the user information (including but not limited to user equipment information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in the present application are all information and data authorized by the user or authorized by all parties.

[0188] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium, and when the computer program is executed, the processes of the above-mentioned embodiments of the methods can be included. Any reference to memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (Read-Only Memory, ROM), magnetic tape, floppy disk, flash memory, optical storage, high-density embedded non-volatile memory, resistive memory (ReRAM), magnetoresistive random access memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric memory (Ferroelectric Random Access Memory, FRAM), phase change memory (Phase Change Memory, PCM), graphene memory, etc. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, etc. As an illustration but not limitation, RAM can be in various forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), etc. The database involved in the embodiments provided in the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a block chain, etc., without being limited thereto. The processor involved in the embodiments provided in the present application can be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., without being limited thereto.

[0189] Any combination of the technical features of the above embodiments can be made. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0190] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A control method of an electric heating appliance, characterized in that, The electric heating appliance comprises a first switch module, a second switch module and a load, a control end of the first switch module is used for accessing a target pulse width modulation signal, an output end of the first switch module is connected with a control end of the second switch module, an input end of the second switch module is used for accessing a power supply voltage, an output end of the second switch module is connected with the load, and an output signal of the first switch module is used for controlling the second switch module to be in a conduction state or an off state; The method comprises: determining a first pulse width modulation signal; the first pulse width modulation signal is a signal loaded on a control end of the first switch module in a state in which the first switch module independently works, so as to drive the first switch module to reliably switch on and off; obtaining a target working parameter of the load; determining a second pulse width modulation signal according to the target working parameter; the second pulse width modulation signal is a signal loaded on a control end of the second switch module to drive the second switch module to be in a conduction state or an off state, so as to enable the load to work according to the target working parameter; determining and outputting the target pulse width modulation signal according to the first pulse width modulation signal and the second pulse width modulation signal, so as to enable the load to work according to the target working parameter; wherein a frequency of the first pulse width modulation signal is greater than a frequency of the second pulse width modulation signal; the determining and outputting the target pulse width modulation signal according to the first pulse width modulation signal and the second pulse width modulation signal comprises: performing an AND operation on the first pulse width modulation signal and the second pulse width modulation signal, and determining and outputting the target pulse width modulation signal.

2. The method of claim 1, wherein, The first switch module comprises a first switch tube and a frequency selection network circuit; an input end of the frequency selection network circuit is used for accessing the target pulse width modulation signal, an output end of the frequency selection network circuit is connected with an input end of the first switch tube, and an output end of the first switch tube is connected with the control end of the second switch module; the step of determining the first pulse width modulation signal comprises: obtaining a parameter of the frequency selection network circuit; determining the first pulse width modulation signal whose frequency matches the frequency selection network circuit according to the parameter of the frequency selection network circuit.

3. The method of claim 1, wherein, The target working parameter comprises a target temperature, and the determining the second pulse width modulation signal according to the target working parameter comprises: obtaining an actual temperature of the load; determining the second pulse width modulation signal according to a difference between the actual temperature and the target temperature.

4. The method of claim 3, wherein, The determining the second pulse width modulation signal according to the difference between the actual temperature and the target temperature comprises: if the actual temperature is less than the target temperature, increasing a duty cycle of a current second pulse width modulation signal according to the difference between the target temperature and the actual temperature to update the second pulse width modulation signal; and / or if the actual temperature is greater than the target temperature, decreasing the duty cycle of the current second pulse width modulation signal according to the difference between the target temperature and the actual temperature to update the second pulse width modulation signal; wherein an increasing degree is in a positive correlation with the difference between the target temperature and the actual temperature. The degree of reduction is positively correlated with the difference between the actual temperature and the target temperature.

5. The method of claim 3, wherein, The actual temperature of the load is obtained by: Obtaining the resistance of the load; According to the resistance of the load, the actual temperature of the load is determined.

6. A control device for an electric heating appliance, characterized in that The electric heating appliance comprises a first switch module, a second switch module and a load, a control end of the first switch module is used for accessing a target pulse width modulation signal, an output end of the first switch module is connected with a control end of the second switch module, an input end of the second switch module is used for accessing a power supply voltage, and an output end of the second switch module is connected with the load. The output signal of the first switch module is used to control the second switch module to be in a conduction state or an off state. The device comprises: A first pulse width modulation signal determination module is configured to determine a first pulse width modulation signal, and load the first pulse width modulation signal on the control end of the first switch module to drive the first switch module to reliably switch on and off when the first pulse width modulation signal is in a state in which the first switch module works independently. A target working parameter module is configured to obtain a target working parameter of the load. A second pulse width modulation signal determination module is configured to determine a second pulse width modulation signal according to the target working parameter, and load the second pulse width modulation signal on the control end of the second switch module to drive the second switch module to be in a conduction state or an off state, so that the load works according to the target working parameter. A target pulse width modulation signal determination module is configured to determine and output the target pulse width modulation signal according to the first pulse width modulation signal and the second pulse width modulation signal, so that the load works according to the target working parameter. The frequency of the first pulse width modulation signal is greater than the frequency of the second pulse width modulation signal. The target pulse width modulation signal determination module comprises: A target pulse width modulation signal determination unit is configured to perform an AND operation on the first pulse width modulation signal and the second pulse width modulation signal, and determine and output the target pulse width modulation signal.

7. A controller comprising a memory and a processor, the memory storing a computer program, characterized in that, The processor executes the computer program to implement the steps of the method in any one of claims 1 to 5.

8. An electric heating appliance, characterized in that It comprises: A first switch module, a control end of which is used for accessing a target pulse width modulation signal; A second switch module, a control end of which is connected with the output end of the first switch module, and an input end of which is used for accessing a power supply voltage, so that the second switch module is in a conduction state or an off state under the action of the output signal of the first switch module; A load, which is connected with the output end of the second switch module; A controller, an output end of which is connected with the control end of the first switch module, and which is used to execute the steps of the method in any one of claims 1 to 5.

9. An electric heating appliance according to claim 8, characterised in that The controller comprises: A sampling circuit, an input end of which is connected with the load; A calculation module, an input end of which is connected with the output end of the sampling circuit, and an output end of which is connected with the control end of the first switch module, which is used to determine the actual temperature of the load according to the output signal of the sampling circuit, and is also used to execute the steps of the method in any one of claims 1 to 5.

10. An electric heating appliance according to claim 8, characterised in that The first switch module comprises: A frequency selection network circuit, an input end of which is connected with the output end of the controller; A first switch tube, a control end of which is connected to an output end of the frequency selection network circuit, and an output end of which is connected to a control end of the second switch module.

11. The electrically heated tool of claim 8 wherein, The second switch module comprises: A second switch tube, a control end of which is connected to an output end of the first switch module, an input end of which is used for connecting a power supply voltage, and an output end of which is connected to the load.

12. A computer readable storage medium having stored thereon a computer program, characterized in that, The computer program, when executed by a processor, implements the steps of the method of any one of claims 1 to 5.

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