Heating body control device and method and atomization device

Abstract

The invention relates to a heating element control device and method and an atomization device, the heating element control device comprises a controller, a switch module and a load access end, the input end of the switch module is used for accessing a power supply, the output end is connected with the load access end, and the control end is connected with the controller; the load access end is used for accessing a heating element or a standard resistor, and the controller is used for controlling the on-off state of the switch module, sampling the resistance value of the heating element based on the sampling resistor when the load access end is accessed to the heating element, and controlling the working state of the heating element based on the resistance value of the heating element. The sampling resistor is an equivalent resistor between the input end and the output end of the switch module. Therefore, resistance sampling and heating control of the heating element can be realized based on one switch module, the circuit structure is simplified, the cost is reduced, the circuit utilization rate is improved, and the working performance of the heating element control device is improved.

Description

Technical Field

[0001] This application relates to the technical field of atomization devices, and particularly to a heating element control device, method, and atomization device. Background Art

[0002] An atomization device is a device that generates atomized aerosol for users. The atomization device includes a heating element, and by energizing the heating element, the heating element operates to generate heat. When there is an aerosol matrix in the atomization device, the heated heating element can heat the aerosol matrix, causing the temperature of the aerosol matrix to rise. After reaching the boiling point, it is atomized to form an aerosol.

[0003] However, in traditional atomization devices, there are at least two switching circuits. One of them forms a sampling path with a sampling resistor to sample the resistance of the heating element, and the other is used to control the heating of the heating element. However, this structure is relatively complex, the cost is relatively high, and the working time of the sampling path is short, resulting in a large waste of output capacity, leading to poor working performance of traditional atomization devices. Summary of the Invention

[0004] Based on this, in view of the above problems, it is necessary to provide a heating element control device, method, and atomization device with a simple structure and good working performance.

[0005] A heating element control device includes: a controller, a switching module, and a load access terminal. The input terminal of the switching module is used to access a power supply, the output terminal is connected to the load access terminal, and the control terminal is connected to the controller; the load access terminal is used to access a heating element or a standard resistor.

[0006] The controller is used to control the on / off state of the switching module, and when the load access terminal accesses the heating element, sample the resistance value of the heating element based on the sampling resistor, and control the working state of the heating element based on the resistance value of the heating element; the sampling resistor is the equivalent resistance between the input terminal and the output terminal of the switching module.

[0007] In one embodiment, the switching module includes a switching tube, a first resistor, and a second resistor. The control terminal of the switching tube is connected to the controller through the first resistor. The first end of the switching tube is used to access the power supply, the second end of the switching tube is connected to the load access terminal, the first end of the second resistor is connected to the first end of the switching tube, and the second end is connected to the common terminal of the control terminal of the switching tube and the first resistor.

[0008] In one embodiment, the load access terminal includes a first access terminal and a second access terminal. The first access terminal is connected to the output terminal of the switching module, the second access terminal is grounded, and the first access terminal and the second access terminal are used to respectively connect the two ends of the heating element or the two ends of the standard resistor.

[0009] A heating element control method, implemented based on the above-mentioned heating element control device, the method comprising:

[0010] Obtain the resistance value of the heating element;

[0011] Control the working state of the switch module according to the resistance value of the heating element, so that the power of the heating element is maintained within an allowable range.

[0012] In one embodiment, the obtaining the resistance value of the heating element includes:

[0013] Obtain the sampling resistor of the heating element control device;

[0014] Determine the resistance value of the heating element according to the sampling resistor.

[0015] In one embodiment, the obtaining the sampling resistor of the heating element control device includes:

[0016] When a standard resistor is connected to the load access end, obtain the sampling voltage; the sampling voltage is the voltage at the common end of the switch module and the load access end;

[0017] Obtain the sampling resistor according to the sampling voltage and the standard resistor.

[0018] In one embodiment, the determining the resistance value of the heating element according to the sampling resistor includes:

[0019] When a heating element is connected to the load access end, control the switch module to conduct, and obtain the divided voltage; the divided voltage is the voltage at the common end of the switch module and the load access end;

[0020] Determine the resistance value of the heating element according to the power supply voltage connected to the switch module, the divided voltage and the sampling resistor.

[0021] In one embodiment, the controlling the working state of the switch module according to the resistance value of the heating element, so that the power of the heating element is maintained within an allowable range, includes:

[0022] Obtain the working power of the heating element according to the resistance value of the heating element;

[0023] Control the working state of the switch module according to the difference value between the working power and the target power, so that the power of the heating element is maintained within an allowable range.

[0024] In one embodiment, the switch module includes a switching tube, and the controlling the working state of the switch module according to the difference value between the working power and the target power, so that the power of the heating element is maintained within an allowable range, includes:

[0025] Adjust the duty cycle of the control signal of the switching tube according to the difference value between the working power and the target power, so that the power of the heating element is maintained within an allowable range.

[0026] An atomizing device includes a heating element and a heating element control device as described above.

[0027] For the above-mentioned heating element control device, method and atomizing device, the heating element control device includes a controller, a switching module and a load access terminal. The input terminal of the switching module is used to access the power supply, the output terminal is connected to the load access terminal, and the control terminal is connected to the controller; the load access terminal is used to access the heating element or a standard resistor. The controller is used to control the on-off state of the switching module, and when the heating element is connected to the load access terminal, sample the resistance value of the heating element based on the sampling resistor, and control the working state of the heating element based on the resistance value of the heating element. The sampling resistor is the equivalent resistance between the input terminal and the output terminal of the switching module. Based on this, when the heating element is connected to the load access terminal, the resistance value of the heating element can be sampled according to the sampling resistor, and the working state of the heating element can also be controlled, so that the resistance sampling and heating control of the heating element can be realized based on one switching module, simplifying the circuit structure, reducing the cost, improving the circuit utilization rate, and thus improving the working performance of the heating element control device. Description of the Drawings

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0029] Figure 1 It is a schematic block diagram of the structure of a heating element control device in an embodiment;

[0030] Figure 2 It is a schematic detailed structure diagram of a heating element control device in an embodiment;

[0031] Figure 3 It is a schematic flowchart of a heating element control method in an embodiment;

[0032] Figure 4 It is a schematic flowchart of the step of obtaining the resistance value of the heating element in an embodiment;

[0033] Figure 5 It is a schematic flowchart of the step of obtaining the sampling resistor of the heating element control device in an embodiment;

[0034] Figure 6 It is a schematic flowchart of the step of determining the resistance value of the heating element according to the sampling resistor in an embodiment;

[0035] Figure 7 It is a schematic flow chart of the steps for controlling the working state of the switch module according to the resistance value of the heating element in an embodiment. Detailed implementation manners

[0036] To facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant drawings. Embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided so that the disclosure of the present application is more thorough and comprehensive.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0038] It can be understood that the terms "first", "second", etc. used in this application can be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first resistor can be called a second resistor, and similarly, a second resistor can be called a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0039] It can be understood that "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if there is an electrical signal or data transfer between the connected circuits, modules, units, etc.

[0040] It can be understood that "at least one" means one or more, and "a plurality" means two or more. "At least part of an element" means part or all of the element.

[0041] As used herein, the singular forms "a", "an" and "the" may also include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprises / include" or "has" etc. specify the presence of the stated features, wholes, steps, operations, components, parts or combinations thereof, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the related listed items.

[0042] An embodiment of the present application provides a heating element control device, which can be applied in an atomizing device, connected to a heating element, and used to control the heating element. Among them, the heating element is used to heat the aerosol matrix to atomize it and generate aerosol for users. The type of the heating element is not limited. For example, it can be a heating wire or a heating tube, etc., as long as the corresponding function can be achieved.

[0043] In one embodiment, as Figure 1 shown, the heating element control device includes a controller 100, a switch module 200, and a load access terminal 300. The input terminal of the switch module 200 is used to access the power supply, the output terminal is connected to the load access terminal 300, and the control terminal is connected to the controller 100; the load access terminal 300 is used to access the heating element or a standard resistor. The controller 100 is used to control the on / off state of the switch module 200, and when the heating element is connected to the load access terminal 300, sample the resistance value of the heating element based on the sampling resistor, and control the working state of the heating element based on the resistance value of the heating element; the sampling resistor is the equivalent resistance between the input terminal and the output terminal of the switch module 200. Based on this, when the heating element is connected to the load access terminal 300, the resistance value of the heating element can be sampled according to the sampling resistor, and the working state of the heating element can also be controlled based on the resistance value of the heating element, so that the resistance sampling and heating control of the heating element can be realized based on one switch module 200, which simplifies the circuit structure, reduces the cost, improves the circuit utilization rate, and thus improves the working performance of the heating element control device.

[0044] Specifically, the switch module 200 plays a role in controlling the on / off of the circuit. The input terminal of the switch module 200 is used to access the power supply, and the output terminal of the switch module 200 is connected to the load access terminal 300. When the switch module 200 is turned on, the electric energy of the power supply connected to the input terminal of the switch module 200 can be transmitted to the load access terminal 300 through the switch module 200, forming a path with the load access terminal 300, and the device connected to the load access terminal 300 can be put into use. When the switch module 200 is turned off, the electric energy of the power supply connected to the input terminal of the switch module 200 cannot be transmitted to the load access terminal 300, and the device connected to the load access terminal 300 does not work.

[0045] The on / off state of the switch module 200 is controlled by the controller 100. Specifically, the controller 100 is connected to the control terminal of the switch module 200, and can control the on / off state of the switch module 200 by sending different levels to the control terminal of the switch module 200. The type of the controller 100 is not limited. For example, it can be an MCU or a single-chip microcomputer, etc., as long as the corresponding function can be achieved.

[0046] The load access terminal 300 is used to access a heating element or a standard resistor. The standard resistor is a resistor with a known resistance value, for example, it can be a 1Ω nominal resistor. The sampling resistor is the equivalent resistance between the input terminal and the output terminal of the switch module 200. Specifically, the sampling resistor can be obtained according to the structure of the heating element control device when the load access terminal 300 accesses the standard resistor. Generally, the sampling resistor includes the device internal resistance of the switch module and the line impedance on the current path where the switch module 200 is located, such as the impedance of the line between the input terminal and the output terminal of the switch module 200, and the line impedance includes wire impedance and solder joint impedance, etc. Therefore, after the structure of the heating element control device is determined, the sampling resistor can be determined based on the structure of the heating element control device. In this embodiment, the sampling resistor includes the line impedance between the power supply and the switch module 200, the device internal resistance of the switch module 200, and the line impedance between the switch module 200 and the load access terminal.

[0047] When the load access terminal 300 accesses the standard resistor, if the controller 100 controls the switch module 200 to conduct, a path is formed between the power supply and the standard resistor. The controller 100 can sample the voltage on the path, and thus obtain the sampling resistor according to the sampled voltage. Exemplarily, the controller 100 is connected to the common terminal of the switch module 200 and the load access terminal 300. When the switch module 200 conducts, the resistors on the path include the internal resistance of the switch module 200, the line impedance on the path, the solder joint impedance, etc., and also include the standard resistor. The sampling resistor is equivalently regarded as including the internal resistance of the switch module 200, the line impedance on the path, the solder joint impedance, etc. Thus, according to the standard resistor, the voltage at the common terminal of the switch module 200 and the load access terminal 300, and the known power supply voltage, using the voltage division principle, the value of the sampling resistor can be obtained. Taking the end of the standard resistor far from the switch module 200 grounded as an example, the voltage division formula is shown in Equation (1):

[0048] (U - U 采 ) / U 采 = (Rm + Rx) / R 标 (1)

[0049] Wherein, U is the power supply voltage, U 采 is the voltage at the common terminal of the switch module 200 and the load access terminal 300, Rm + Rx is the sampling resistor, and R 标 is the standard resistor.

[0050] After obtaining the sampling resistor, the sampling resistor can be stored, for example, stored in the controller 100. When subsequent control of the heating element connected to the heating element control device is required, it can be directly called, which is convenient to use.

[0051] In addition, the load access terminal 300 can also be connected to a heating element. When the load access terminal 300 is connected to the heating element, the heating element control device can not only perform resistance sampling on the heating element, but also control the heating of the heating element. Specifically, when the heating element control device performs resistance sampling on the heating element: before the heating element starts heating, after the controller 100 controls the switch module 200 to conduct, a path is formed among the power supply, the switch module 200, and the heating element. The controller 100 measures the voltage Ur of the heating element and combines it with the power supply voltage U. Through the voltage division formula: (U - Ur) / Ur = (Rm + Rx) / R, the resistance value R of the heating element can be obtained as R = Ur×(Rm + Rx) / (U - Ur). Here, Rm + Rx is the sampling resistance.

[0052] When the heating element control device controls the heating of the heating element, it can control the on / off state and on / off time of the switch module 200 through the controller 100, etc., to control the working power of the heating element, and further control the heating duration and heat generation amount of the heating element. It can also control the temperature of the heating element, thereby realizing the temperature control of the heating element.

[0053] The structure of the switch module 200 is not unique, as long as it can achieve the functions of the above embodiments. In one embodiment, as Figure 2 shown, the switch module 200 includes a switching transistor Q1, a first resistor R1, and a second resistor R2. The control terminal of the switching transistor Q1 is connected to the controller 100 through the first resistor R1. The first end of the switching transistor Q1 serves as the input terminal of the switch module 200 for connecting to the power supply. The second end of the switching transistor Q1 serves as the output terminal of the switch module 200 and is connected to the load access terminal 300. The first end of the second resistor R2 is connected to the first end of the switching transistor Q1, and the second end is connected to the common terminal of the control terminal of the switching transistor Q1 and the first resistor R1. Correspondingly, the sampling resistance includes the internal resistance Rm of the switching transistor Q1 and the compensation resistor Rx. Here, the compensation resistor Rx includes the line resistance between the switching transistor Q1 and the power supply connection line other than the internal resistance Rm of the switching transistor Q1, and the compensation resistor Rx also includes the line resistance of the connection line between the switching transistor Q1 and the load access terminal.

[0054] Among them, the control end of the switching transistor Q1 serves as the control end of the switching module 200 and is connected to the controller 100. The first end of the switching transistor Q1 serves as the input end of the switching module 200 and is used to connect to the power supply. The second end of the switching transistor Q1 serves as the output end of the switching module 200 and is connected to the load access end 300. The type of the switching transistor Q1 is not limited. Exemplarily, the switching transistor Q1 can be a MOS transistor. Correspondingly, when the control end of the switching transistor Q1 is the gate of the MOS transistor and the first end of the switching transistor Q1 is the source of the MOS transistor, the second end of the switching transistor Q1 is the drain of the MOS transistor; when the first end of the switching transistor Q1 is the drain of the MOS transistor, the second end of the switching transistor Q1 is the source of the MOS transistor. Alternatively, the switching transistor Q1 can also be a triode. Correspondingly, when the control end of the switching transistor Q1 is the base of the triode and the first end of the switching transistor Q1 is the emitter of the triode, the second end of the switching transistor Q1 is the collector of the triode; when the first end of the switching transistor Q1 is the collector of the triode, the second end of the switching transistor Q1 is the emitter of the triode.

[0055] One end of the first resistor R1 is connected to the controller 100, and the other end is connected to the control end of the switching transistor Q1. The control end of the switching transistor Q1 is connected to the controller 100 through the first resistor R1. The first resistor R1 can play a role in limiting the magnitude of the driving current and prevent the device from being damaged due to excessive current. The first end of the second resistor R2 is connected to the first end of the switching transistor Q1, and the second end is connected to the common end of the control end of the switching transistor Q1 and the first resistor R1. The second resistor R2 can be regarded as the pull-up resistor of the switching transistor Q1 to ensure the normal turn-on and turn-off of the switching transistor Q1. It can be understood that in other embodiments, the switching module 200 can also be of other structures as long as those skilled in the art think it can be implemented.

[0056] In this embodiment, the switching module 200 includes a switching transistor Q1, a first resistor R1, and a second resistor R2. The control end of the switching transistor Q1 is connected to the controller 100 through the first resistor R1. The first end of the switching transistor Q1 is used to connect to the power supply. The second end of the switching transistor Q1 is connected to the load access end 300. The first end of the second resistor R2 is connected to the first end of the switching transistor Q1, and the second end is connected to the common end of the control end of the switching transistor Q1 and the first resistor R1. The switching transistor Q1 is controlled by the controller 100 and plays a role in controlling the conduction or disconnection of the branch where it is located. The first resistor R1 and the second resistor R2 can ensure the normal and stable operation of the switching transistor Q1.

[0057] In one embodiment, as Figure 2 shown, the load access end 300 includes a first access end H+ and a second access end H-. The first access end H+ is connected to the output end of the switching module 200, and the second access end H- is grounded. The first access end H+ and the second access end H- are used to connect to both ends of the heating element or both ends of the standard resistor respectively.

[0058] Specifically, the first access terminal H+ and the second access terminal H- are in a floating state when no device is connected. When the first access terminal H+ and the second access terminal H- are respectively connected to both ends of the heating element, if the switch module 200 is turned on, the power supply voltage passes through the switch module 200, the first access terminal H+, the heating element, and the second access terminal H- to ground in sequence, and the heating element is connected in series in the heating element control device. Similarly, when the first access terminal H+ and the second access terminal H- are respectively connected to both ends of the standard resistor, if the switch module 200 is turned on, the power supply voltage passes through the switch module 200, the first access terminal H+, the standard resistor, and the second access terminal H- to ground in sequence, and the standard resistor is connected in series in the heating element control device.

[0059] In this embodiment, the load access terminal 300 includes a first access terminal H+ and a second access terminal H-. The first access terminal H+ is connected to the output terminal of the switch module 200, and the second access terminal H- is grounded. The first access terminal H+ and the second access terminal H- are used to connect to both ends of the heating element or both ends of the standard resistor respectively, so that the heating element or the standard resistor can be connected in series in the circuit, and one end of the heating element or the standard resistor is grounded. When the controller 100 samples the common terminal of the switch module 200 and the first access terminal H+, based on the voltage division principle, the sampled resistance value and the heating element resistance value can be quickly calculated according to the sampled voltage and the power supply voltage.

[0060] The above-mentioned heating element control device includes a controller, a switch module, and a load access terminal. The input terminal of the switch module is used to access the power supply, the output terminal is connected to the load access terminal, and the control terminal is connected to the controller; the load access terminal is used to access the heating element or the standard resistor. The controller is used to control the on / off state of the switch module, and when the load access terminal accesses the heating element, sample the heating element resistance value based on the sampling resistor, and control the working state of the heating element based on the heating element resistance value. The sampling resistor is the equivalent resistance between the input terminal and the output terminal of the switch module. Based on this, when the load access terminal accesses the heating element, the heating element resistance value can be sampled according to the sampling resistor, and the working state of the heating element can also be controlled, so that the resistance sampling and heating control of the heating element can be realized based on one switch module, simplifying the circuit structure, reducing the cost, improving the circuit utilization rate, and thus improving the working performance of the heating element control device.

[0061] In one embodiment, an atomizing device is further provided, which includes the heating element control device of any of the above embodiments. The heating element is connected to the heating element control device, specifically, to the load access terminal of the heating element control device. The type of the heating element is not limited, for example, it can be a heating wire or the like.

[0062] The above atomizing device includes a heating element and a heating element control device. The heating element control device includes a controller, a switch module, and a load access terminal. The input terminal of the switch module is used to connect to a power source, the output terminal is connected to the load access terminal, and the control terminal is connected to the controller. The load access terminal is used to connect to the heating element or a standard resistor. The controller is used to control the on / off state of the switch module, and when the heating element is connected to the load access terminal, sample the resistance value of the heating element based on a sampling resistor, and control the working state of the heating element based on the resistance value of the heating element. The sampling resistor is the equivalent resistance between the input terminal and the output terminal of the switch module. Based on this, when the heating element is connected to the load access terminal, the resistance value of the heating element can be sampled according to the sampling resistor, and the working state of the heating element can also be controlled, so that the resistance sampling and heating control of the heating element can be realized based on one switch module, simplifying the circuit structure, reducing the cost, improving the circuit utilization rate, and thus improving the working performance of the heating element control device.

[0063] In one embodiment, a method for controlling a heating element is provided, which is implemented based on the heating element control device of any of the above embodiments. The method for controlling a heating element can be executed by the controller in the heating element control device of any of the above embodiments. As Figure 3 shown, the method for controlling a heating element includes the following steps:

[0064] Step 302, obtain the resistance value of the heating element.

[0065] Specifically, when the heating element is connected to the load access terminal of the heating element control device, the controller can obtain the resistance value of the connected heating element, simply referred to as the resistance value of the heating element. The way to obtain the resistance value of the heating element is not unique. Exemplarily, the resistance value of the heating element can be the standard resistance value of the heating element, which can correspond to the type or model of the heating element, etc. When the heating element control device is connected to the heating element, the controller can determine the resistance value of the heating element according to the type and model of the heating element, etc. Alternatively, the resistance value of the heating element can also be manually input by the user through an interaction device. The interaction device is connected to the controller, and the controller parses the user instruction transmitted by the interaction device to obtain the resistance value of the heating element included in the user instruction. Among them, the interaction device can be a button, a display screen, a voice device, etc., which is not limited here.

[0066] Step 304, control the working state of the switch module according to the resistance value of the heating element so that the power of the heating element is maintained within an allowable range.

[0067] After obtaining the resistance value of the heating element, the controller can judge the working state of the heating element. Then, based on the working state of the heating element, control the working state of the switch module to control the power of the heating element so that the power of the heating element is maintained within an allowable range. The allowable range is the required power range, which can be a fixed value or a numerical range determined by a fixed value and an allowable error.

[0068] Specifically, the controller can adjust the power of the heating element by controlling whether the switch module is turned on, or the on-time of the switch module, etc. Exemplarily, if the power of the heating element is too large, the controller can turn off the switch module or shorten the on-time of the switch module to reduce the power-on duration of the heating element, thereby reducing the power of the heating element. If the power of the heating element is too small, the controller can turn on the switch module or extend the on-time of the switch module to extend the power-on duration of the heating element, thereby increasing the power of the heating element.

[0069] In this embodiment, after obtaining the resistance value of the heating element, the working state of the switch module is controlled according to the resistance value of the heating element, so that the power of the heating element is maintained within the allowable range, thereby making the operation of the heating element more meet the requirements.

[0070] In one embodiment, as Figure 4 shown, step 302 includes step 402 and step 404.

[0071] Step 402, obtain the sampling resistor of the heating element control device.

[0072] Among them, the sampling resistor is obtained according to the structure of the heating element control device when a standard resistor is connected to the load access terminal. The standard resistor is a resistor with a known resistance value, for example, it can be a 1Ω nominal resistor. Generally, the sampling resistor includes the device internal resistance of the heating element control device and the line impedance on the current path. The line impedance includes wire impedance and solder joint impedance, etc. Therefore, after the structure of the heating element control device is determined, the sampling resistor can be determined based on the structure of the heating element control device. After obtaining the sampling resistor, it can be stored, for example, stored in the controller. When the heating element connected to the heating element control device needs to be controlled later, it can be directly called, which is convenient to use.

[0073] Step 404, determine the resistance value of the heating element according to the sampling resistor.

[0074] After the load access terminal is connected to the heating element, the resistance value of the heating element can be determined according to the sampling resistor. The method for determining the resistance value of the heating element is not unique. For example, when the power supply, the switch module, and the heating element are in the same branch, the branch current can be detected. Combining the obtained power supply voltage and the sampling resistor, based on Ohm's law, the resistance value of the heating element can be calculated.

[0075] In this embodiment, the sampling resistor of the heating element control device is obtained, and the resistance value of the heating element is determined according to the sampling resistor. The resistance value of the heating element determined thereby is the actual resistance value of the heating element. When the heating element is controlled for heating later using the resistance value of the heating element, the control accuracy can be improved.

[0076] In one embodiment, as Figure 5As shown, step 402 includes step 502 and step 504.

[0077] Step 502, when a standard resistor is connected to the load access terminal, obtain the sampling voltage.

[0078] Among them, the sampling voltage is the voltage at the common terminal of the switch module and the load access terminal. When a standard resistor is connected to the load access terminal, if the controller controls the switch module to conduct, a path is formed between the power supply and the standard resistor. The controller can sample the voltage on the path. Exemplarily, the controller is connected to the common terminal of the switch module and the load access terminal. When the switch module conducts, the controller collects the voltage at the common terminal of the switch module and the load access terminal as the sampling voltage.

[0079] Step 504, obtain the sampling resistor according to the sampling voltage and the standard resistor.

[0080] After obtaining the sampling voltage, according to the standard resistor, the sampling voltage, and the obtained power supply voltage, using the voltage division principle, the value of the sampling resistor can be obtained. Taking the case where one end of the standard resistor far from the switch module is grounded as an example, the voltage division formula is shown in Equation (1):

[0081] (U - U 采 ) / U 采 = (Rm + Rx) / R 标 (1)

[0082] Among them, U is the power supply voltage, U 采 is the sampling voltage, Rm + Rx is the sampling resistor, and R 标 is the standard resistor.

[0083] In this embodiment, when a standard resistor is connected to the load access terminal, obtain the sampling voltage, obtain the sampling resistor according to the sampling voltage and the standard resistor, and use the standard resistor to access the existing circuit structure to obtain the sampling resistor, further reducing the circuit cost.

[0084] In one embodiment, as Figure 6 shown, step 404 includes step 604 and step 606.

[0085] Step 604, when a heating element is connected to the load access terminal, control the switch module to conduct and obtain the voltage division voltage.

[0086] Among them, the voltage division voltage is the voltage at the common terminal of the switch module and the load access terminal. Before the heating element is officially started, after the controller controls the switch module to conduct, a path is formed among the power supply, the switch module, and the heating element. The controller is connected to the common terminal of the switch module and the load access terminal to obtain the voltage at the common terminal of the switch module and the load access terminal as the voltage division voltage. When one end of the heating element far from the switch module is grounded, the voltage division voltage is the heating element voltage.

[0087] Step 606: Determine the resistance value of the heating element based on the power supply voltage, divided voltage, and sampling resistor connected to the switching module.

[0088] After that, the resistance value of the heating element can be determined according to the power supply voltage, divided voltage, and sampling resistor connected to the switching module. Taking the divided voltage as Ur, the power supply voltage as U, and the sampling resistor as Rm + Rx as an example, the resistance value R of the heating element can be calculated through the voltage division formula: (U - Ur) / Ur = (Rm + Rx) / R, and R = Ur×(Rm + Rx) / (U - Ur).

[0089] In this embodiment, when the heating element is connected to the load access end, the switching module is controlled to conduct, the divided voltage is obtained, and the resistance value of the heating element is determined according to the power supply voltage, divided voltage, and sampling resistor connected to the switching module, which is convenient for subsequent heating control of the heating element.

[0090] In one embodiment, as Figure 7 shown, step 304 includes step 704 and step 706.

[0091] Step 704: Obtain the operating power of the heating element based on the resistance value of the heating element.

[0092] After obtaining the resistance value of the heating element, since the power supply voltage is a known value or can be measured. Then, based on the corresponding relationship between resistance, voltage, and power, the operating power of the heating element can be calculated according to the resistance value of the heating element and the power supply voltage. Exemplarily, the operating power of the heating element can be calculated according to the formula P = U1² / R, where R is the resistance value of the heating element and U1 is the voltage of the heating element, which can be obtained from the power supply voltage.

[0093] Step 706: Control the operating state of the switching module according to the difference value between the operating power and the target power, so that the power of the heating element is maintained within the allowable range.

[0094] Specifically, the allowable range can be the range determined by the target power and the allowable error. The difference value can be a difference or a ratio.

[0095] If the difference value between the operating power and the target power indicates that the operating power is greater than the target power, the switching module can be controlled to turn off or the conduction time can be reduced to lower the operating power and maintain the power of the heating element within the allowable range. If the difference value between the operating power and the target power indicates that the operating power is less than the target power, the switching module can be controlled to conduct or the conduction time can be increased to increase the operating power and maintain the power of the heating element within the allowable range.

[0096] In this embodiment, after obtaining the operating power of the heating element based on its resistance value, the operating state of the switch module is controlled according to the difference value between the operating power and the target power, so that the power of the heating element is maintained within the allowable range. Thus, the switch module can be adjusted in a targeted manner, which can improve the control accuracy of the power of the heating element.

[0097] In one embodiment, the switch module includes a switching transistor, and step 706 includes: adjusting the duty cycle of the control signal of the switching transistor according to the difference value between the operating power and the target power, so that the power of the heating element is maintained within the allowable range.

[0098] When the working module includes a switching transistor, the control of the working module can be specifically achieved by adjusting the duty cycle of the control signal of the switching transistor. The control terminal of the switching transistor is turned off when receiving a high level and turned on when receiving a low level. Or it is turned off when receiving a low level and turned on when receiving a high level. Thus, by controlling the duty cycle of the control signal of the switching transistor, the conduction time of the switching transistor can be controlled, and further the operating power of the heating element can be controlled. Exemplarily, if the operating power of the heating element is 10 W and the target power is 6 W, the duty cycle of the control signal of the switching transistor can be adjusted to 60% so that the operating power of the heating element is adjusted to 6 W.

[0099] It should be understood that although the steps in the flowcharts involved in the above-described embodiments are shown in sequence according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless there is a clear indication in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-described embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily executed at the same moment, but can be executed at different moments. The execution order of these steps or stages is not necessarily sequential, but can be executed alternately or in turn with at least a part of other steps or steps or stages in other steps.

[0100] To better understand the above embodiments, the following will be explained in detail with a specific embodiment. In one embodiment, the heating element control device includes a controller (not shown in the figure), a switch module, and a load access terminal. As Figure 2 shown, the switch module includes a switching transistor Q1, a first resistor R1, and a second resistor R2. The load access terminal 300 includes a first access terminal H+ and a second access terminal H-. The control terminal of the switching transistor Q1 is connected to the HEAT PWM pin of the controller through the first resistor R1. The second terminal of the switching transistor Q2 and the load access terminal 300 are connected to the HEAT AD pin of the controller. The switching transistor is a MOS transistor.

[0101] First, use the internal resistance Rm of the switching transistor Q1 and the compensation resistor Rx (the line resistance of the connection line between the switching transistor and the power supply and load access terminals other than the switching transistor) as the sampling resistors. A 1Ω nominal resistor is connected in series in the path of the switching transistor Q1, and the sum of the resistances Rm + Rx can be measured as the sampling resistor.

[0102] Then, before the heating element starts to work and heat up officially, the controller sets the HEAT PWM terminal to a low level. After controlling the switching transistor Q1 to open the path, a path is formed with the heating element R. The controller measures the voltage Ur of the heating element R through the HEAT AD pin. The controller can also measure the power supply voltage U on the path. Through the voltage division formula: (U - Ur) / Ur = (Rm + Rx) / R, the accurate value of R can be obtained, where R = Ur×(Rm + Rx) / (U - Ur).

[0103] Next, after the value of R is determined, since the MOS internal resistance of the switching transistor changes with the heating time, and the change in the resistance value R of the heating element is small, during the heating process, only the voltage value Ur is measured. The working power is calculated through the power formula: P = Ur×Ur / R. Then, the working power is compared with the target power, and the duty cycle of the switching transistor is adjusted according to the comparison result to ensure a constant power output.

[0104] The above heating element control device uses one MOS transistor to achieve resistance measurement and power output. Compared with using a sampling MOS transistor and a control MOS transistor simultaneously, it reduces one MOS and peripheral devices, saving costs. And it can save one IO of the controller and does not require additional control of the sampling MOS transistor, reducing the requirements for the control chip.

[0105] In the description of this specification, the descriptions referring to terms such as "some embodiments", "other embodiments", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0106] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0107] The above-described embodiments only represent several implementation manners of the present application. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A heating element control device, characterized in that, Comprising: A controller, a switch module, and a load access terminal. The input terminal of the switch module is used to access a power supply, the output terminal is connected to the load access terminal, and the control terminal is connected to the controller; The load access terminal is used to access a heating element or a standard resistor; The controller is used to control the on / off state of the switch module, and when a heating element is connected to the load access terminal, sample the resistance value of the heating element based on a sampling resistor, and control the working state of the heating element based on the resistance value of the heating element; the sampling resistor is the equivalent resistance between the input terminal and the output terminal of the switch module.

2. The heating element control device according to claim 1, wherein The switch module includes a switch tube, a first resistor, and a second resistor. The control terminal of the switch tube is connected to the controller through the first resistor. The first end of the switch tube is used to access a power supply, the second end of the switch tube is connected to the load access terminal, the first end of the second resistor is connected to the first end of the switch tube, and the second end is connected to the common terminal of the control terminal of the switch tube and the first resistor.

3. The heating element control device according to claim 1, wherein The load access terminal includes a first access terminal and a second access terminal. The first access terminal is connected to the output terminal of the switch module, the second access terminal is grounded, and the first access terminal and the second access terminal are used to respectively connect the two ends of a heating element or the two ends of a standard resistor.

4. A heating element control method, characterized in that, Implemented based on the heating element control device according to any one of claims 1-3, the method includes: Obtaining the resistance value of the heating element; Controlling the working state of the switch module according to the resistance value of the heating element so that the power of the heating element is maintained within an allowable range.

5. The heating element control method according to claim 4, wherein The obtaining the resistance value of the heating element includes: Obtaining the sampling resistor of the heating element control device; Determining the resistance value of the heating element according to the sampling resistor.

6. The heating element control method according to claim 5, wherein The obtaining the sampling resistor of the heating element control device includes: When a standard resistor is connected to the load access terminal, obtaining a sampling voltage; the sampling voltage is the voltage at the common terminal of the switch module and the load access terminal; Obtaining the sampling resistor according to the sampling voltage and the standard resistor.

7. The heating element control method according to claim 5, characterized in that The determining the resistance value of the heating element according to the sampling resistor includes: When a heating element is connected to the load access terminal, controlling the switch module to conduct, and obtaining a divided voltage; the divided voltage is the voltage at the common terminal of the switch module and the load access terminal; Determining the resistance value of the heating element according to the power supply voltage connected to the switch module, the divided voltage, and the sampling resistor.

8. The heating element control method according to claim 4, wherein The controlling the working state of the switch module according to the resistance value of the heating element so that the power of the heating element is maintained within an allowable range includes: Obtaining the working power of the heating element according to the resistance value of the heating element; Controlling the working state of the switch module according to the difference value between the working power and the target power so that the power of the heating element is maintained within an allowable range.

9. The heating element control method according to claim 8, wherein The switch module includes a switch tube. The controlling the working state of the switch module according to the difference value between the working power and the target power so that the power of the heating element is maintained within an allowable range includes: Adjusting the duty cycle of the control signal of the switch tube according to the difference value between the working power and the target power so that the power of the heating element is maintained within an allowable range.

10. An atomization device, characterized in that, Including a heating element and the heating element control device according to any one of claims 1-3.

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