Load detection circuit and aerosol-generating device

Abstract

The embodiment of the utility model discloses a load detection circuit and an aerosol generation device. The load detection circuit comprises a power supply; the controller is connected with the power supply and is provided with a first pin, a second pin and a third pin; the load is provided with a first end and a second end, the first end is electrically connected with the first pin and the second pin, and the second end is connected with a reference ground; the switching element is electrically connected between the power supply and the load, and the switching element is electrically connected with the third pin to receive a control signal sent by the controller, so that the controller controls the switching element to be switched on or switched off; wherein the first pin is used for providing a first voltage for the load, and the second pin is used for collecting a voltage value of the first end. By means of the mode, load detection can be achieved only through the switch element and the controller, additional electronic components do not need to be added, and the manufacturing cost of the electronic equipment can be reduced.

Description

[Technical field]

[0001] The embodiments of the present application relate to the field of hardware circuit technology, and in particular to a load detection circuit and an aerosol generating device. [Background technology]

[0002] Electronic devices usually need to detect the load to confirm whether the load is normal. If the load is normal, the controller of the electronic device controls the supply of power to the load; if the load is abnormal, the controller of the electronic device controls the suspension of supply of power to the load, thereby protecting the load. At present, the cost of such detection circuits is relatively high, which leads to a high overall manufacturing cost of electronic devices. [Summary of the invention]

[0003] The embodiment of the present application provides a load detection circuit, which can realize load detection at a relatively low cost.

[0004] A load detection circuit, comprising:

[0005] power supply;

[0006] A controller connected to the power supply and having a first pin, a second pin and a third pin;

[0007] A load having a first end and a second end, wherein the first end is electrically connected to the first pin and the second pin respectively, and the second end is connected to a reference ground;

[0008] a switch element, electrically connected between the power source and the load, wherein the switch element is electrically connected to the third pin to receive a control signal sent by the controller, so that the controller controls the switch element to be turned on or off;

[0009] The first pin is used to provide a first voltage to the load, and the second pin is used to collect a voltage value of the first end.

[0010] In one embodiment, the load detection circuit further includes a first resistor, one end of the first resistor is electrically connected to the first pin, and the other end of the first resistor is electrically connected to the first end of the load;

[0011] In one embodiment, the load detection circuit further includes a second resistor, one end of the second resistor is electrically connected to the second pin, and the other end of the second resistor is electrically connected to the output end of the switch element.

[0012] In one embodiment, the resistance of the first resistor is smaller than the resistance of the second resistor.

[0013] In one embodiment, the controller further includes a fourth pin electrically connected to the first pin, the fourth pin is a voltage sampling pin, and the fourth pin is used to collect a voltage value output by the first pin.

[0014] In one embodiment, the controller further includes a fifth pin electrically connected to the first end, and the fifth pin is used to provide a second voltage to the load.

[0015] In one embodiment, the switch element comprises a PMOS tube, a source of the PMOS tube is electrically connected to the power supply voltage, a drain is electrically connected to the first end of the load, and a gate is electrically connected to the third pin of the controller.

[0016] In one embodiment, the load detection circuit further includes a third resistor, one end of the third resistor is electrically connected to the power supply, and the other end of the third resistor is electrically connected to the gate.

[0017] In one embodiment, the third resistor has a resistance of 2000 ohms to 10000 ohms.

[0018] In one embodiment, the second pin comprises an ADC voltage sampling pin.

[0019] The present application also provides an aerosol generating device, including:

[0020] a chamber for containing an aerosolizable matrix material;

[0021] The load detection circuit described in the above embodiment;

[0022] Wherein, the load is a heating element, and the heating element is used to heat the matrix material to generate aerosol.

[0023] The load detection circuit provided in the above embodiment electrically connects the load to the first pin and the second pin of the controller respectively, and electrically connects the load to the power supply through the switch element. The controller determines whether the voltage across the load is in a normal state based on the voltage collected by the second pin. If it is in a normal state, the switch element is controlled to be in an on state; if the load is in an abnormal state, the switch element is controlled to be in an off state, thereby preventing the load from working in an abnormal state, thereby protecting the load. In addition, the load detection circuit provided in the above embodiment can realize load detection only through the switch element and the controller, without adding additional electronic components, which can reduce the manufacturing cost of the electronic equipment.

Brief Description of the Drawings

[0024] One or more embodiments are exemplarily described by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and the figures in the drawings do not constitute proportional limitations unless otherwise stated.

[0025] Figure 1 A schematic diagram of the structure of a load detection circuit provided in one embodiment of the present application;

[0026] Figure 2 A schematic diagram of the structure of a load detection circuit provided in one embodiment of the present application;

[0027] Figure 3 A schematic diagram of the structure of a load detection circuit provided in one embodiment of the present application;

[0028] Figure 4 A schematic diagram of the structure of a load detection circuit provided in one embodiment of the present application;

[0029] Figure 5 A schematic diagram of the structure of a load detection circuit provided in one embodiment of the present application;

[0030] Figure 6 A schematic diagram of the structure of a load detection circuit provided in one embodiment of the present application;

[0031] Figure 7 A schematic structural diagram of an aerosol generating device provided in one embodiment of the present application. [Specific implementation method]

[0032] In order to facilitate the understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" / "fixed to" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween. The terms "upper", "lower", "left", "right", "inside", "outside" and similar expressions used in this specification are for illustrative purposes only.

[0033] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0034] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0035] In the embodiments of the present application, the "installation" includes fixing or restricting a component or device to a specific position or place by welding, screwing, clamping, bonding, etc. The component or device can remain stationary at the specific position or place or move within a limited range. After the component or device is fixed or restricted to a specific position or place, it may or may not be disassembled, and there is no limitation in the embodiments of the present application.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0037] An embodiment of the present application provides a load detection circuit, such as Figure 1 As shown, the load detection circuit is applied to an electronic device, and the load detection circuit includes a controller 10, a load 20 and a switch element 30. The load 20 and the switch element 30 are both electrically connected to the controller. The controller serves as a control center of the electronic device and is used to control the electronic device to perform corresponding functions.

[0038] The controller can be a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), a single chip microcomputer, an ARM (Acorn RISC Machine) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination of these components. In addition, the controller can also be any conventional processor, controller, microcontroller or state machine. The controller can also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in combination with a DSP, and / or any other such configuration.

[0039] Please continue reading Figure 1The load detection circuit includes a controller 10, a load 20 and a switch element 30. The controller 10 is provided with a first pin 11, a second pin 12 and a third pin 13. The load 20 has a first end 21 and a second end 22. The first pin 11 and the second pin 12 are both electrically connected to the first end 21 of the load 20. The second end 22 of the load 20 is electrically connected to the reference ground. The switch element 30 is electrically connected between the power supply and the load 30. The switch element 30 is electrically connected to the third pin 13 to receive a control signal sent by the controller. The control signal makes the switch element 30 in a conducting state or a cut-off state. Among them, the first pin 11 is used to input a first voltage to the load 20. The load 20 is turned on under the action of the first voltage. The second pin 12 is a voltage adopting pin, which is used to collect the voltage on the first end 21 of the load 20. Since the second end of the load 20 is electrically connected to the reference ground, the voltage collected on the second pin 12 is the voltage at both ends of the load 20.

[0040] It should be noted that the power supply can be the voltage across the battery cell of the electronic device, or the voltage of other nodes in the circuit of the electronic device, and the power supply is electrically connected to the power supply pin VCC of the controller 10 through the resistor 70, thereby providing power to the controller 10. The load detection circuit also includes a capacitor 80, one end of the capacitor 80 is electrically connected to the power supply pin VCC, and the other end is electrically connected to the reference ground, so as to filter the power supply voltage so as to stably supply power to the controller 10.

[0041] The switch element 30 has a control end 31, an input end and an output end 33. The control end 31 is electrically connected to the third pin 13 of the controller 10, the input end 32 of the switch element 30 is electrically connected to the power supply, and the output end 33 of the switch element 30 is electrically connected to the first end 21 of the load 20. When the control signal received by the control end 31 puts the switch element 30 in an on state, the power supply can provide electrical energy to the load 20 through the switch element 30, and the load 20 enters a working state; and when the control signal received by the control end 31 puts the switch element 30 in an off state, the power supply stops providing electrical energy to the load 20.

[0042] In some embodiments, the second pin 12 may be an ADC voltage sampling pin.

[0043] When the electronic device starts working, the controller receives a start signal and controls the first pin 11 to output a first voltage, which is a high level. The first voltage is applied to the first end 21 of the load 20 so that the load 20 is turned on, and the second pin 12 starts to collect the voltage value of the first end 21 of the load 20. At the same time, during the period when the first pin 11 outputs the first voltage, the controller sends a control signal to control the switch element 30 to be in a cut-off state, so that the load 20 is disconnected from the power supply.

[0044] Further, the controller compares the voltage value collected by the second pin 12 with a preset voltage threshold, which may be a threshold range, and if the voltage value collected by the second pin 12 is within the threshold range, the controller determines that the load 20 is in a normal state. If the voltage value collected by the second pin 12 is outside the threshold range, the controller determines that the load 20 is in an abnormal state.

[0045] Abnormal conditions include open circuit or short circuit of load 30. For example, the preset voltage threshold is 15-30mV. When the voltage value collected by the second pin 12 is 40mv, the controller compares the 40mv voltage value collected by the second pin 12 with the voltage threshold, and confirms that the voltage value collected by the second pin 12 is greater than the upper limit value of the voltage threshold 30mv. The controller then determines that load 20 is in an open circuit state.

[0046] When the voltage value collected by the second pin 12 is 5mv, the controller compares the 5mv voltage value collected by the second pin 12 with the voltage threshold, and confirms that the voltage value collected by the second pin 12 is less than the lower limit value of the voltage threshold 15mv, then the controller determines that the load 20 is in a short circuit state.

[0047] When the controller determines that the load 20 is in a normal state, the controller controls the first pin 11 to change from an output high level state to a high impedance state, and sends a control signal to turn the switch element 30 on. Since the first pin 11 is in a high impedance state, the circuit between the load 20 and the first pin 11 is basically open. Since the second pin 12 is used to collect voltage, the current flowing through the second pin 12 is also very small. At this time, the power supply can provide power to the load 20 through the switch element 30, and the load 20 starts to work.

[0048] When the controller determines that the load 20 is in an abnormal state, the controller can send a control signal to turn off the switch element 30, thereby preventing the load 20 from working in an abnormal state, thereby protecting the load 20. In addition, the load detection circuit provided in this embodiment can detect the load 20 before the load 20 works only through the switch element 30 and the controller 10, without adding additional electronic components, which can reduce the manufacturing cost of the electronic device.

[0049] In some embodiments, Figure 2 As shown, the load detection circuit also includes a first resistor 40, one end of the first resistor 40 is electrically connected to the first pin 11, and the other end is electrically connected to the first end 21 of the load 20. The first resistor 40 is used to limit the current flowing to the load 20 to avoid a large current flowing through the first pin 11 when the resistance of the load 20 is small, thereby damaging the controller.

[0050] In addition, by setting the first resistor 40, the state of the load 20 can also be determined by calculating the specific resistance value of the load 20. Since one end of the first resistor 40 is electrically connected to the first end 21 of the load 20, and the other end of the first resistor 40 is electrically connected to the first pin 11, and the first voltage output on the first pin 11 can be considered to be basically equal to the power supply voltage of the power supply pin VCC, the voltage drop across the first resistor 40 is the difference between the power supply voltage and the voltage collected on the second pin 12. The current flowing through the first resistor 40 can be obtained by dividing the difference by the resistance value of the first resistor 40. The current is the current flowing through the load 20, and the voltage collected by the second pin 12 is the voltage across the load 20. The resistance value of the load 20 can be obtained by dividing the voltage collected by the first pin 12 by the current flowing through the first resistor 40.

[0051] The controller 10 compares the resistance value with the preset resistance value. If it is within the range of the preset resistance value, it is determined that the load 20 is in a normal state, and then the controller 10 can control the supply of power to the load 20 so that the load 20 starts working. If it is outside the range of the preset resistance value, it is determined that the load 20 is in an abnormal state, and then the controller 10 stops supplying power to the load 20 to prevent the load 20 from working in an abnormal state.

[0052] For example, if the resistance of the first resistor 40 is 200 ohms, the voltage value collected by the second pin 12 is 100 mv, and the voltage value of the power supply pin VCC of the controller is 3.3 V, then the voltage across the first resistor 40 is 3.3 V minus 0.1 V, and the voltage across the first resistor 40 is 3.2 V. Therefore, according to Ohm's law, the current flowing through the first resistor 40 is 16 mA, and the current flowing through the load 20 is also 16 mA. Since the voltage value of 100 mV collected by the second pin 12 is the voltage value across the load 20, further according to Ohm's law, the resistance of the load 20 can be calculated to be 6.25 ohms. The controller compares the resistance with the preset resistance range of the load 20 to determine whether the load 20 is in a normal state. When the calculated resistance value of the load 20 is greater than the upper limit value of the preset threshold range, the controller determines that the load 20 is in an open circuit state; when the calculated resistance value of the load 20 is less than the lower limit value of the preset threshold range, the controller determines that the load 20 is in a short circuit state; when the calculated resistance value of the load 20 is within the preset threshold range, the controller determines that the load 20 is in a normal state.

[0053] And, in some embodiments, as Figure 3 As shown, the load detection circuit also includes a second resistor 50, one end of which is electrically connected to the second pin 12, and the other end is electrically connected to the output end 33 of the switch element 30, so as to prevent the induced voltage generated by the parasitic capacitance of the switch element 30 at the moment of switching on and off of the switch element 30 from damaging the controller.

[0054] In some embodiments, the resistance of the first resistor 40 is smaller than the resistance of the second resistor 50. If the resistance of the first resistor 40 is smaller, the current flowing through the load 20 will be larger, so the voltage collected by the second pin 12 will also be larger, which is convenient for the controller to judge the state of the load 20. If the second resistor 50 is larger, it can better block the induced voltage from the switch element 30 and prevent the induced voltage from damaging the controller.

[0055] In some embodiments, Figure 4 As shown, the switch element 30 includes a PMOS tube, the gate (G pole) of the PMOS tube is electrically connected to the third pin 13 of the controller 10 as a control terminal 31 to receive a control signal, the source (S pole) is electrically connected to the power supply as an input terminal 32, and the drain (D pole) is electrically connected to the first terminal 21 of the load 20 as an output terminal 33. Thus, when the controller determines that the load 20 is in a normal state, the controller controls the sending of a low-level control signal to the gate of the PMOS tube, the PMOS tube is in a conducting state under the action of the low level, the power supply provides electric energy to the load 20, and the load 20 starts to work. When the controller determines that the load 20 is in an abnormal state, the controller controls the sending of a high-level control signal to the gate of the PMOS tube, the PMOS tube is in a cut-off state under the action of the high level, thereby preventing the power supply from providing electric energy to the load 20 and preventing the load 20 from working in an abnormal state.

[0056] Further in some embodiments, Figure 5 As shown, the load detection circuit further includes a third resistor 60, one end of which is electrically connected to the power supply, and the other end of which is electrically connected to the gate of the PMOS tube, so as to provide an additional voltage to the gate of the PMOS tube to ensure that when the load 20 is in an abnormal state, the PMOS tube can be in a cut-off state. In some embodiments, the third resistor 60 has a resistance value of 2K to 10K ohms.

[0057] It should be noted that the switch element 30 may also be an NMSO tube. Alternatively, in other embodiments, the switch element 30 may also be configured as any other controllable switch, such as a relay, a triode, an insulated gate bipolar transistor (IGBT) device, an integrated gate commutated thyristor (IGCT) device, a gate turn-off thyristor (GTO) device, a silicon controlled rectifier (SCR) device, a junction gate field effect transistor (JFET) device, a MOS controlled thyristor (MCT) device, or any one of the above.

[0058] In some embodiments, to improve the measurement accuracy, such as Figure 6As shown, the load detection circuit also includes a fourth pin 14, which is a voltage sampling pin, for example, an ADC sampling pin. The fourth pin 14 is electrically connected to the first pin 11 and is used to collect the actual voltage output on the first pin 11, thereby eliminating the error caused by the internal resistance voltage divider in the first pin 11.

[0059] And, in some embodiments, please continue to see Figure 6 The load detection circuit also includes a fifth pin 15, which is used to provide a second voltage to the load 20, that is, when the switch element 30 is in the off state, the first pin 11 and the fifth pin 15 respectively provide the first voltage and the second voltage to the load, thereby increasing the current flowing through the load 20, thereby improving the measurement accuracy.

[0060] In some embodiments, the electronic device may be as follows Figure 7 The aerosol generating device 200 shown in the figure comprises a shell 210a, the shell 210a is provided with an air inlet 211a for external air to enter the aerosol generating device 200a, and an air outlet 212a for the user to inhale the aerosol, a liquid storage chamber 220a is provided in the shell 210a, the liquid storage chamber 220a is used to store liquid aerosolizable matrix material, an air guide tube 260a is longitudinally extended in the liquid storage chamber 220a, one end of the air guide tube 260a is connected to the air outlet 212a, and in order to seal the liquid storage chamber 220a, a sealing member 230a is further provided in the shell 210a, and the sealing member 230a is interference fit with the inner wall of the shell 210a to seal the liquid storage chamber 220a.

[0061] The air guide tube 260a is provided with a liquid guiding element 240a and a heating element 250a combined with the liquid guiding element 240a. The heating element 250a is the load in the above-mentioned load detection circuit. The liquid guiding element 240a partially extends into the liquid storage chamber 220a. The liquid guiding element 240a is made of a hygroscopic material, such as non-woven fabric, cotton fiber, glass fiber or porous material. The heating element 250a can be combined with the liquid guiding element 240a by printing, deposition, sintering or physical assembly, or wound on the liquid guiding element 240a, so that the aerosolizable matrix material in the liquid storage chamber 220a can be absorbed by the liquid guiding element 240a, and the liquid guiding element 240a further transfers the aerosolizable matrix material to the heating element 250a through its internal tiny gaps or microporous structures. The heating element 250a heats the matrix material to atomize it to produce an aerosol, and releases the aerosol in the air guide tube 260a.

[0062] The seal 230a is provided with an air vent 231a, which is connected to the air duct 260a. When the user inhales at the air outlet 212a, external air enters the aerosol generating device 200a through the air inlet 211a, then flows into the air vent 231aa through the internal air flow channel, and enters the air duct 260a through the air vent 231a, and finally carries the aerosol in the air duct 260a to the air vent 231a for the user to inhale.

[0063] The aerosol generating device 200a also includes a main board 290a, a battery cell 270a and an airflow sensor 280a. The main board 290a is provided with a controller of the aerosol generating device 200a. The battery cell 270a, the heating element 250a and the airflow sensor 280a are electrically connected to the controller respectively. When the user inhales at the air outlet 212a, external air enters the aerosol generating device 200a from the air inlet 211a, and then the airflow sensor 280a senses the inhaled airflow and generates a sensing signal, which is further sent to the controller, and the controller controls the battery cell 270a to provide electrical energy to the heating element 250a.

[0064] The controller of the aerosol generating device 200 controls the conduction or cutoff of the switch element 30 by outputting a PWM control signal, thereby controlling the power output to the heating element 250a, so that the power of the heating element 250a is constant each time it works. In addition, by calculating the specific resistance value of the load 20 described in the above embodiment, the specific resistance value of the heating element 250a during the working process can also be calculated. When the calculated specific resistance value exceeds the preset resistance value range by a large amount, the controller can also determine that the heating element 250a is in a dry burning state at this time. In the dry burning state, the resistance value of the heating element is large, and the dry burning state is usually caused by insufficient liquid supply of the liquid matrix on the heating element 250a.

[0065] Alternatively, in some embodiments, the aerosolizable matrix material may also be a solid matrix such as a cigarette stick, and the aerosolizable matrix material is preferably a tobacco-containing material that releases volatile compounds from the product when heated; or it may be a non-tobacco material that is suitable for electric heating and smoking after heating. It may include one or more of powder, particles, fragments, strips, or flakes of one or more of herb leaves, tobacco leaves, homogenized tobacco, and expanded tobacco; or the solid matrix may contain additional tobacco or non-tobacco volatile flavor compounds to be released when the matrix is ​​heated.

[0066] The aerosol generating device 200 is provided with a chamber for containing an aerosolizable matrix material and a heating element for heating the matrix material. The heating element heats the aerosolizable matrix material contained in the chamber, thereby causing at least a portion of the active material of the matrix material to volatilize due to the heat to generate an aerosol. The user can inhale the aerosol by puffing on the matrix material.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Under the concept of the present application, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present application as described above, which are not provided in detail for the sake of simplicity. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A load detection circuit, characterized in that: include: power supply; A controller connected to the power supply and having a first pin, a second pin and a third pin; A load having a first end and a second end, wherein the first end is electrically connected to the first pin and the second pin respectively, and the second end is connected to a reference ground; a switch element, electrically connected between the power source and the load, wherein the switch element is electrically connected to the third pin to receive a control signal sent by the controller, so that the controller controls the switch element to be turned on or off; The first pin is used to provide a first voltage to the load, and the second pin is used to collect a voltage value of the first end.

2. The load detection circuit according to claim 1, characterized in that: The load detection circuit further includes a first resistor, one end of which is electrically connected to the first pin, and the other end of which is electrically connected to the first end of the load.

3. The load detection circuit according to claim 2, characterized in that: The load detection circuit further includes a second resistor, one end of the second resistor is electrically connected to the second pin, and the other end of the second resistor is electrically connected to the output end of the switch element.

4. The load detection circuit according to claim 3, characterized in that: The resistance value of the first resistor is smaller than the resistance value of the second resistor.

5. The load detection circuit according to claim 1, characterized in that: The controller further includes a fourth pin electrically connected to the first pin, the fourth pin is a voltage sampling pin, and the fourth pin is used to collect a voltage value output by the first pin.

6. The load detection circuit according to claim 1, characterized in that: The controller further includes a fifth pin electrically connected to the first end, and the fifth pin is used to provide a second voltage to the load.

7. The load detection circuit according to claim 1, characterized in that: The switch element comprises a PMOS tube, a source of the PMOS tube is electrically connected to the power supply voltage, a drain is electrically connected to the first end of the load, and a gate is electrically connected to the third pin of the controller.

8. The load detection circuit according to claim 7, characterized in that: The load detection circuit further includes a third resistor, one end of the third resistor is electrically connected to the power supply, and the other end of the third resistor is electrically connected to the gate.

9. The load detection circuit according to claim 8, characterized in that: The third resistor has a resistance value of 2000 ohms to 10000 ohms.

10. The load detection circuit according to claim 1, characterized in that: The second pin comprises an ADC voltage sampling pin.

11. An aerosol generating device, characterized in that: include: a chamber for containing an aerosolizable matrix material; The load detection circuit according to any one of claims 1 to 10; Wherein, the load is a heating element, and the heating element is used to heat the matrix material to generate aerosol.

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