Heating control circuit and aerosol generating device

Abstract

The utility model relates to the technical field of aerosol generation, and particularly discloses a heating control circuit and an aerosol generation device. Comprising a plurality of heating body units; one end of each positive end control switch is electrically connected to the positive end of the power supply circuit, and the other end of each positive end control switch is electrically connected with at least one heating body unit; one end of each negative end control switch is grounded, and the other end of each negative end control switch is electrically connected with at least one heating body unit, so that each heating body unit is connected between the corresponding positive end control switch and the corresponding negative end control switch; and the controller is electrically connected with the plurality of positive end control switches and the plurality of negative end control switches, and is configured to selectively control the at least one positive end control switch and the at least one negative end control switch to be switched on at the same time, so that the target heating body unit between the selected positive end control switch and the selected negative end control switch is started to work. Therefore, the control of more than two heating element units can be realized.

Description

Technical Field

[0001] This application relates to the field of aerosol generation technology, and in particular to a heating control circuit and an aerosol generation device. Background Technology

[0002] To meet the requirements of aerosol generating devices for explosive force and smoke volume, existing aerosol generating devices generally have two or more heating element units. Therefore, how to control two or more heating element units is particularly important. Utility Model Content

[0003] This application provides a heating control circuit and an aerosol generating device, which can control two or more heating element units.

[0004] One technical solution adopted in this application is: providing a heating control circuit, including:

[0005] Multiple heating element units;

[0006] Multiple positive terminal control switches, one end of each positive terminal control switch is electrically connected to the positive terminal of the power supply circuit, and the other end is electrically connected to at least one of the heating element units;

[0007] Multiple negative control switches are provided, each with one end grounded and the other end electrically connected to at least one heating element unit, such that each heating element unit is connected between a corresponding positive control switch and a corresponding negative control switch; and

[0008] The controller, which is electrically connected to a plurality of the positive control switches and a plurality of the negative control switches respectively, is configured to selectively control at least one of the positive control switches and at least one of the negative control switches to be turned on simultaneously, so that the target heating element unit located between the selected positive control switch and the negative control switch starts to work.

[0009] Optionally, it also includes a data acquisition switch circuit, one end of which is electrically connected to the positive terminal of the power supply circuit, and the other end is electrically connected to at least one of the heating element units; the controller is further configured to control the data acquisition switch circuit and the negative terminal control switch corresponding to the target heating element unit to be turned on simultaneously, thereby enabling the detection of the resistance value of the target heating element unit.

[0010] Optionally, the acquisition switch circuit and the positive terminal control switch are not simultaneously turned on;

[0011] Alternatively, the acquisition switch circuit and the positive terminal control switch may be switched on alternately under the control of the controller.

[0012] Optionally, the plurality of heating element units include a heating branch formed by at least two heating element units connected in series, and the negative terminal control switch and the positive terminal control switch are alternately connected between the plurality of heating element units.

[0013] Optionally, the heating element unit includes at least two heating elements connected in parallel; multiple heating element units are distributed in at least two different locations.

[0014] Optionally, the acquisition switch circuit includes:

[0015] A data acquisition switch, one end of which is electrically connected to the positive terminal of the power supply circuit;

[0016] A sampling resistor is electrically connected between the other end of the acquisition switch and at least one of the heating element units. A first sampling node and a second sampling node are respectively provided at both ends of the sampling resistor. Both the first sampling node and the second sampling node are electrically connected to the controller, so that the controller is also configured to calculate the resistance value of the target heating element unit based on the voltage of the first sampling node and the second sampling node when the acquisition switch circuit and the negative terminal control switch corresponding to the target heating element unit are simultaneously turned on.

[0017] Optionally, each of the heating element units has two heating element sampling nodes at both ends, and two adjacent heating element units share one heating element sampling node;

[0018] When the second sampling node is located between the first heating element unit and the first negative terminal control switch, the second sampling node serves as one of the heating element sampling nodes of the first heating element unit;

[0019] The heating element sampling nodes are all electrically connected to the controller, which is further configured to detect the resistance value of the target heating element unit based on the voltage of the first sampling node, the voltage of the second sampling node, and the voltages of the two heating element sampling nodes respectively set at both ends of the target heating element unit.

[0020] Optionally, when the first heating element unit is electrically connected between the second sampling node and the first negative terminal control switch, the second sampling node serves as the heating element sampling node of the first heating element unit.

[0021] Each of the remaining heating element units has two heating element sampling nodes at both ends, and two adjacent heating element units share one heating element sampling node;

[0022] The heating element sampling nodes are all electrically connected to the controller, which is further configured to detect the resistance value of the target heating element unit based on the voltage of the first sampling node, the voltage of the second sampling node, and the voltage of the heating element sampling node corresponding to the target heating element unit.

[0023] Optionally, the power supply circuit includes at least two batteries connected in parallel or in series.

[0024] Another technical solution adopted in this application is to provide an aerosol generating device, including a heating control circuit as described in any embodiment of this application.

[0025] In this embodiment, each positive control switch is electrically connected to the positive terminal of the power supply circuit at one end and to at least one heating element unit at the other end. Similarly, each negative control switch is grounded at one end and electrically connected to at least one heating element unit at the other end. This ensures that each heating element unit is connected between its corresponding positive and negative control switches. The controller is electrically connected to multiple positive and negative control switches and configured to selectively control at least one positive and at least one negative control switch to be simultaneously turned on, thereby activating the target heating element unit located between the selected positive and negative control switches. Through this method, this embodiment achieves control over two or more heating element units. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of a heating control circuit provided in an embodiment of this application;

[0028] Figure 2 This is a schematic diagram of another heating control circuit provided in an embodiment of this application;

[0029] Figure 3 This is a schematic diagram of a heating control circuit provided in an embodiment of this application, which includes two positive terminal control switches, four heating element units, and three negative terminal control switches.

[0030] Figure 4 yes Figure 3 The circuit diagram of the heating control circuit shown is shown.

[0031] Figure 5This is a schematic diagram of another heating control circuit provided in this application embodiment, including two positive terminal control switches, four heating element units, and three negative terminal control switches;

[0032] Figure 6 yes Figure 5 The circuit diagram of the heating control circuit shown is shown.

[0033] Figure 7 This is a schematic diagram of the arrangement of four heating element units provided in an embodiment of this application;

[0034] Figure 8 This is a schematic diagram of another arrangement of four heating element units provided in an embodiment of this application;

[0035] Figure 9 This is a schematic diagram of an aerosol generating device provided in an embodiment of this application. Detailed Implementation

[0036] To facilitate understanding of this application, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as "locked" to another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this specification are for illustrative purposes only.

[0037] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0038] Please see Figure 1 This is a heating control circuit provided in an embodiment of this application. For example... Figure 1 As shown, the heating control circuit 100 includes multiple heating element units 11, multiple positive terminal control switches 12, multiple negative terminal control switches 13, and a controller 14.

[0039] The heating element unit 11 includes at least two heating elements connected in parallel. These heating elements can be heating wires, ceramic cores, stainless steel heating sheets, thick-film resistors, etc. By including at least two heating elements in parallel in the heating element unit 11, the resistance of the heating element unit 11 is reduced, thereby generating more heat per unit time.

[0040] The heating element unit 11 can be a central heating method or a peripheral heating method. The heating element unit 11 can also heat the aerosol generation matrix to generate aerosols through one or more of the following methods: heat conduction, electromagnetic induction, chemical change, infrared heating, resonance, photoelectric conversion, and photothermal conversion.

[0041] In some embodiments, the multiple heating elements 11 are distributed at least in two different locations. By dispersing the multiple heating elements 11, the problem of excessively high temperature in a certain area due to concentrated heating by multiple heating elements 11, which could cause the aerosol generation matrix in that area to burn, can be effectively avoided. At the same time, uniform heating of the aerosol generation matrix can be achieved, improving the heating effect.

[0042] One end of each positive control switch 12 is electrically connected to the positive terminal of the power supply circuit, and the other end is electrically connected to at least one heating element unit 11. One end of each negative control switch 13 is grounded, and the other end is electrically connected to at least one heating element unit 11, so that each heating element unit 11 is connected between the corresponding positive control switch 12 and the corresponding negative control switch 13.

[0043] The power supply circuit refers to the circuit design of the power supply section that provides power to the multiple heating element units 11. It can be an internal power supply for the heating control circuit 100, providing power not only to the multiple heating element units 11 but also serving as a power source for other electrical modules within the heating control circuit 100. Alternatively, it can be an external power supply for the heating control circuit 100, connected to it via wired or wireless connection to provide power to the multiple heating element units 11.

[0044] When the number of heating elements contained in the multiple heating element units 11 is greater than the preset number, the power supply circuit includes at least two batteries connected in parallel or in series.

[0045] Taking a power supply circuit comprising at least two batteries connected in series as an example, the supply voltage can be increased, while the stable operation of the power supply circuit is not affected when a battery fails or its voltage drops. In some embodiments, the power supply circuit further includes a battery and a boost circuit, the boost circuit being electrically connected between the battery and multiple positive terminal control switches 12 to increase the supply voltage output by the battery.

[0046] In one embodiment, both the positive terminal control switch 12 and the negative terminal control switch 13 include MOS switching transistors. It is understood that the positive terminal control switch 12 and the negative terminal control switch 13 may also employ switching devices such as field-effect transistors, thyristors, triacs, transistors, and IGBTs.

[0047] The plurality of heating element units 11 includes a heating branch formed by at least two heating element units 11 connected in series, and the negative terminal control switch 13 and the positive terminal control switch 12 are alternately connected between the plurality of heating element units 11.

[0048] In one example, multiple heating element units 11 are connected in series to form a heating branch, and the multiple heating element units 11 have a beginning end and an end end. The negative end control switch 13 and the positive end control switch 12 are alternately connected to the beginning end of the multiple heating element units 11, between two adjacent heating element units 11, and at the end of the multiple heating element units 11.

[0049] In one example, the plurality of heating element units 11 includes a heating branch formed by at least two heating element units 11 connected in series, and also includes a heating branch formed by a heating element unit 11, wherein the plurality of heating element units 11 have a head end and an end end.

[0050] A heating branch formed by a single heating element unit 11 is defined as a first heating branch. A heating branch consisting of at least two heating element units 11 connected in series is defined as a second heating branch. The first and second heating branches are connected in parallel and intersect at a connection point. Simultaneously, the end of the first heating branch furthest from the connection point is defined as the beginning of the plurality of heating element units 11, and the end of the second heating branch furthest from the connection point is defined as the end of the plurality of heating element units 11. Negative control switches 13 and positive control switches 12 are alternately connected to the beginning of the plurality of heating element units 11, between adjacent heating element units 11, and at the end of the plurality of heating element units 11. A controller 14 is electrically connected to the plurality of positive control switches 12 and the plurality of negative control switches 13, and is configured to selectively control at least one positive control switch 12 and at least one negative control switch 13 to be simultaneously turned on, causing the target heating element unit located between the selected positive control switch 12 and negative control switch 13 to start operation.

[0051] Controller 14 can be a general-purpose processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA), microcontroller, ARM (Acorn RISC Machine) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination of these components. Furthermore, controller 14 can also be any conventional processor, controller, microcontroller, or state machine. Controller 14 can also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors combined with a DSP, and / or any other such configuration.

[0052] Please see Figure 2The heating control circuit 100 also includes a data acquisition switch circuit 15, one end of which is electrically connected to the positive terminal of the power supply circuit, and the other end is electrically connected to at least one heating element unit 11. The controller 14 is also configured to control the data acquisition switch circuit 15 and the negative terminal control switch 13 corresponding to the target heating element unit to be turned on simultaneously, thereby enabling the detection of the resistance value of the target heating element unit.

[0053] The acquisition switch circuit 15 and the positive terminal control switch 12 are not turned on at the same time, or the acquisition switch circuit 15 and the positive terminal control switch 12 are turned on alternately under the control of the controller 14.

[0054] The resistance detection process and the start-up process of the heating element unit 11 are two independent processes. During the start-up process, at least one positive control switch 12 and at least one negative control switch 13 are simultaneously turned on. During the resistance detection process, the acquisition switch circuit 15 and the negative control switch 13 corresponding to the target heating element unit are simultaneously turned on. Therefore, the acquisition switch circuit 15 and the positive control switch 12 are not simultaneously turned on. In some embodiments, the acquisition switch circuit 15 and the positive control switch 12 are turned on alternately, that is, the resistance detection process and the start-up process of the heating element unit 11 are executed alternately, so that the controller 14 drives the target heating element unit to start operation based on the resistance value of the target heating element unit, for example, to achieve constant power heating, thereby improving the heating effect.

[0055] The acquisition switch circuit 15 includes an acquisition switch 151 and a sampling resistor 152.

[0056] One end of the data acquisition switch 151 is electrically connected to the positive terminal of the power supply circuit.

[0057] In one embodiment, the data acquisition switch 151 includes a MOS switch. It is understood that the data acquisition switch 151 may also employ switching devices such as field-effect transistors, thyristors, triacs, transistors, and IGBTs.

[0058] The resistance value of the target heating element unit can be detected by a single acquisition switch 151, which reduces the use of power devices and thus reduces product costs.

[0059] The sampling resistor 152 is electrically connected between the other end of the acquisition switch 151 and at least one heating element unit 11. The two ends of the sampling resistor 152 are respectively provided with a first sampling node a1 and a second sampling node a2. The first sampling node a1 and the second sampling node a2 are both electrically connected to the controller 14 (not shown in the figure), so that the controller 14 is also configured to calculate the resistance value of the target heating element unit based on the voltage of the first sampling node a1 and the second sampling node a2 when the control acquisition switch circuit 15 and the negative terminal control switch 13 corresponding to the target heating element unit are turned on at the same time.

[0060] The sampling resistor 152 and the target heating element unit are in the same current loop. Based on the characteristic that the loop current is equal everywhere, the resistance value of the sampling resistor 152 is known. The controller 14 can list the voltage of the first sampling node a1, the voltage of the second sampling node a2 and the resistance value of the sampling resistor 152 as one side of an equation, and then calculate the resistance value of the target heating element unit.

[0061] It is understandable that the current flowing through the sampling resistor 152 can also be calculated based on the voltage of the first sampling node a1, the voltage of the second sampling node a2, and the resistance value of the sampling resistor 152.

[0062] In one example, each heating element unit 11 has two heating element sampling nodes at both ends, and two adjacent heating element units share one heating element sampling node.

[0063] When the second sampling node a12 is located between the first heating element unit 11 and the first negative terminal control switch 13, the second sampling node a12 serves as one of the heating element sampling nodes of the first heating element unit 11.

[0064] The heating element sampling nodes are all electrically connected to the controller 14. The controller 14 is also configured to detect the resistance value of the target heating element unit based on the voltage of the first sampling node a11, the voltage of the second sampling node a12, and the voltages of the two heating element sampling nodes set at both ends of the target heating element unit.

[0065] By setting two sampling nodes at each end of each heating element unit 11, it is equivalent to each heating element unit 11 having two ADC acquisition channels. The target heating element unit includes at least two parallel heating elements, and its total resistance is relatively small, making the internal resistance of the MOS switch have a significant impact on the resistance detection. By detecting the voltage of the two sampling nodes at each end of the target heating element unit, the resistance value of the target heating element unit is detected, eliminating the influence of the internal resistance of the conducting MOS switch on the resistance detection process, thereby improving the accuracy of heating control.

[0066] like Figure 3As shown, the heating control circuit 100 includes four heating element units 11, two positive terminal control switches 12, three negative terminal control switches 13, a controller 14, and a data acquisition switch circuit 15.

[0067] Four heating element units 11 are connected in series to form a heating branch. One end of the first negative control switch 13 is grounded, and the other end is electrically connected to the first heating element unit 11. One end of the first positive control switch 12 is electrically connected to the positive terminal of the power supply circuit (VBAT as shown in the figure), and the other end is electrically connected between the first heating element unit 11 and the second heating element unit 11. One end of the second negative control switch 13 is grounded, and the other end is electrically connected between the second heating element unit 11 and the third heating element unit 11. One end of the second positive control switch 12 is electrically connected to the positive terminal of the power supply circuit (VBAT as shown in the figure), and the other end is electrically connected between the third heating element unit 11 and the fourth heating element unit 11. One end of the third negative control switch 13 is grounded, and the other end is electrically connected to the fourth heating element unit 11.

[0068] The sampling resistor 152 has a first sampling node a11 and a second sampling node a12 at its two ends. The second sampling node a12 is located between the first heating element unit 11 and the first negative terminal control switch 13. Since the second sampling node a12 serves as one of the sampling nodes for the first heating element unit 11, the two ends of the first heating element unit 11 are respectively equipped with heating element sampling nodes a12 and a13. The two ends of the second heating element unit 11 are respectively equipped with heating element sampling nodes a13 and a14, meaning the first and second heating element units 11 share a single heating element sampling node a13. The two ends of the third heating element unit 11 are respectively equipped with heating element sampling nodes a14 and a15, meaning the second and third heating element units 11 share a single heating element sampling node a14. The fourth heating element unit 11 has a heating element sampling node a15 and a heating element sampling node a16 at its two ends, respectively. That is, the third heating element unit 11 and the fourth heating element unit 11 use one heating element sampling node a15. The first sampling node a11, the second sampling node a12, and the heating element sampling nodes a13-a16 are all electrically connected to the controller 14 (not shown in the figure).

[0069] like Figure 4As shown, the four heating element units 11 are heating wires FS1, FS2, FS3, and FS4, which are connected in series to form a heating branch. The two positive terminal control switches 12 are MOS switches S1 and S2, respectively. The three negative terminal control switches 13 are MOS switches S3, S4, and S5, respectively. The acquisition switch 151 is MOS switch S6, and the sampling resistor 152 is resistor R0. The connection relationship is shown in the figure and will not be elaborated further here.

[0070] A first sampling node a11 and a second sampling node a12 are respectively set at both ends of resistor R0; the second sampling node a12 is located between heating wire FS1 and MOS switch S3. The second sampling node a12 serves as one of the heating element sampling nodes of heating wire FS1. Therefore, the two heating element sampling nodes set at both ends of heating wire FS1 are heating element sampling node a12 and heating element sampling node a13. Heating wire FS2 shares heating element sampling node a13 with heating wire FS1. Therefore, the two heating element sampling nodes set at both ends of heating wire FS2 are heating element sampling node a13 and heating element sampling node a14. Heating wire FS3 shares heating element sampling node a14 with heating wire FS2. Therefore, the two heating element sampling nodes set at both ends of heating wire FS3 are heating element sampling node a14 and heating element sampling node a15. Heating wire FS4 shares heating element sampling node a15 with heating wire FS3. Therefore, the two heating element sampling nodes set at both ends of heating wire FS3 are heating element sampling node a15 and heating element sampling node a16.

[0071] Assuming the target heating element unit is heating wire FS1, the controller 14 controls the MOS switch S4 or MOS switch S5 to turn on, the voltage of the first sampling node a11 is Va11, the voltage of the second sampling node a12 is Va12, the voltage of the heating element sampling node a13 is Va13, and the resistance value of heating wire FS1 is R1, then the resistance value R1 of heating wire FS1 is calculated by the following formula: (Va12-Va11) / R0=(Va13-Va12) / R1. Similarly, assuming the target heating element unit is heating wire FS2, the controller 14 controls the MOS switch S4 or MOS switch S5 to turn on, the voltage of the first sampling node a11 is Va11, the voltage of the second sampling node a12 is Va12, the two heating element sampling nodes set at both ends of the heating wire FS2 are heating element sampling node a13 and heating element sampling node a14 respectively, the voltage of heating element sampling node a13 is Va13, the voltage of heating element sampling node a14 is Va14, and the resistance value of heating wire FS1 is R2. Then the resistance value R2 of heating wire FS2 is calculated by the following formula: (Va12-Va11) / R0=(Va14-Va13) / R2.

[0072] In one example, when the first heating element unit 11 is connected between the second sampling node a22 and the first negative terminal control switch 13, the second sampling node a22 serves as the heating element sampling node of the first heating element unit 11.

[0073] Each of the remaining heating element units 11 has two heating element sampling nodes at both ends, and two adjacent heating element units 11 share one heating element sampling node.

[0074] The heating element sampling nodes are all electrically connected to the controller 14. The controller 14 is also configured to detect the resistance value of the target heating element unit based on the voltage of the first sampling node a21, the voltage of the second sampling node a22, and the heating element sampling node corresponding to the target heating element unit.

[0075] A heating element sampling node is set in the first heating element unit 11, and two heating element sampling nodes are set at both ends of each of the remaining heating element units 11. This eliminates the influence of the internal resistance of the MOS switch transistor that is turned on during the resistance detection of the target heating element unit on the resistance detection, thereby improving the accuracy of heating control.

[0076] like Figure 5 As shown, the heating control circuit 100 includes four heating element units 11, two positive terminal control switches 12, three negative terminal control switches 13, a controller 14, and a data acquisition switch circuit 15.

[0077] Three heating element units 11 are connected in series to form one heating branch, and another heating element unit 11 forms another heating branch. The two heating branches are connected in parallel and intersect at the second sampling node a22. One end of the first negative control switch 13 is grounded, and the other end is electrically connected to the first heating element unit 11. One end of the first positive control switch 12 is electrically connected to the positive terminal of the power supply circuit (VBAT as shown in the figure), and the other end is electrically connected between the first heating element unit 11 and the second heating element unit 11. One end of the second negative control switch 13 is grounded, and the other end is electrically connected between the second heating element unit 11 and the third heating element unit 11. One end of the second positive control switch 12 is electrically connected to the positive terminal of the power supply circuit (VBAT as shown in the figure), and the other end is electrically connected between the third heating element unit 11 and the fourth heating element unit 11. One end of the third negative control switch 13 is grounded, and the other end is electrically connected to the fourth heating element unit 11.

[0078] The sampling resistor 152 has a first sampling node a21 and a second sampling node a22 at its two ends. The first heating element unit 11 is electrically connected between the second sampling node a22 and the first negative terminal control switch 13. The second sampling node a22 serves as the heating element sampling node for the first heating element unit 11. The second heating element unit 11 has heating element sampling nodes a22 and a23 at its two ends, meaning the first and second heating element units 11 share a single heating element sampling node a22. The third heating element unit 11 has heating element sampling nodes a23 and a24 at its two ends, meaning the second and third heating element units 11 share a single heating element sampling node a23. The fourth heating element unit 11 has heating element sampling nodes a24 and a25 at its two ends, meaning the third and fourth heating element units 11 share a single heating element sampling node a24. The first sampling node a21, the second sampling node a22, and the heating element sampling nodes a23-a25 are all electrically connected to the controller 14 (not shown in the figure).

[0079] like Figure 6As shown, the four heating element units 11 are heating wires FS1, FS2, FS3, and FS4. Heating wires FS2, FS3, and FS4 are connected in series to form one heating branch, and heating wire FS1 forms another heating branch. The two heating branches are connected in parallel and intersect at the second sampling node a22. The two positive terminal control switches 12 are MOS switches S1 and S2, respectively. The three negative terminal control switches 13 are MOS switches S3, S4, and S5, respectively. The acquisition switch 151 is MOS switch S6, and the sampling resistor 152 is resistor R0. The connection relationship is shown in the figure and will not be described in detail here.

[0080] A first sampling node a21 and a second sampling node a22 are respectively set at both ends of the resistor R0; the heating wire FS1 is connected between the second sampling node a22 and the MOS switch S3, and the second sampling node a22 serves as the heating element sampling node of the heating wire FS1; the heating wire FS2 shares the heating element sampling node a22 with the heating wire FS1, so the two heating element sampling nodes set at both ends of the heating wire FS2 are heating element sampling node a22 and heating element sampling node a23; the heating wire FS3 shares the heating element sampling node a23 with the heating wire FS2, so the two heating element sampling nodes set at both ends of the heating wire FS3 are heating element sampling node a23 and heating element sampling node a24; the heating wire FS4 shares the heating element sampling node a24 with the heating wire FS3, so the two heating element sampling nodes set at both ends of the heating wire FS3 are heating element sampling node a24 and heating element sampling node a25.

[0081] Assuming the target heating element unit is heating wire FS1, the controller 14 controls the MOS switch S3 to turn on, the voltage of the first sampling node a21 is Va21, the voltage of the second sampling node a22 is Va22, and the resistance value of heating wire FS1 is R1, then the resistance value R1 of heating wire FS1 is calculated by the following formula: (Va22-Va21) / R0=Va22 / R1. Similarly, assuming the target heating element unit is heating wire FS2, the controller 14 controls the MOS switch S4 or MOS switch S5 to turn on, the voltage of the first sampling node a11 is Va21, the voltage of the second sampling node a22 is Va22, the two heating element sampling nodes set at both ends of the heating wire FS2 are heating element sampling node a22 and heating element sampling node a23 respectively, the voltage of heating element sampling node a23 is Va23, and the resistance value of heating wire FS1 is R2. Then the resistance value R2 of heating wire FS2 is calculated by the following formula: (Va22-Va21) / R0=(Va23-Va22) / R2.

[0082] exist Figure 4 or Figure 6Based on this, taking heating wires FS1, FS2, FS3, and FS4, each comprising two parallel heating elements, as an example, heating wires FS1, FS2, FS3, and FS4 can be as follows: Figure 7 As shown, they can be arranged side by side, or as... Figure 8 The cross-settings are shown.

[0083] By arranging heating wires FS1, FS2, FS3 and FS4 side by side or crosswise, so that they are distributed in at least two different positions, uniform heating of the aerosol generation matrix can be achieved, thereby improving the heating effect.

[0084] The heating control circuit provided in this application embodiment is configured such that one end of each positive control switch is electrically connected to the positive terminal of the power supply circuit, and the other end is electrically connected to at least one heating element unit; one end of each negative control switch is grounded, and the other end is electrically connected to at least one heating element unit. This ensures that each heating element unit is connected between its corresponding positive and negative control switches. The controller is electrically connected to multiple positive and negative control switches and configured to selectively control at least one positive and at least one negative control switch to be simultaneously turned on, thereby activating the target heating element unit located between the selected positive and negative control switches. Through this method, this application embodiment achieves control of two or more heating element units.

[0085] Please see Figure 9 This is an aerosol generating device provided in an embodiment of this application. For example... Figure 9 As shown, the aerosol generating apparatus 200 includes a heating control circuit 100 as described in any embodiment of this application.

[0086] In one example, the aerosol generating device 200 also includes a power supply circuit electrically connected to the heating control circuit 100 for providing power to the plurality of heating element units 11.

[0087] It should be noted that while preferred embodiments of this application are provided in the specification and accompanying drawings, this application can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are not intended to impose additional limitations on the content of this application; their purpose is to provide a more thorough and comprehensive understanding of the disclosure of this application. Furthermore, the above-described technical features can be combined with each other to form various embodiments not listed above, all of which are considered to be within the scope of this application's specification. Moreover, those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A heating control circuit, characterized in that, include: Multiple heating element units; Multiple positive terminal control switches, one end of each positive terminal control switch is electrically connected to the positive terminal of the power supply circuit, and the other end is electrically connected to at least one of the heating element units; Multiple negative terminal control switches, one end of each negative terminal control switch is grounded, and the other end is electrically connected to at least one of the heating element units, so that each heating element unit is connected between the corresponding positive terminal control switch and the corresponding negative terminal control switch; and The controller, which is electrically connected to a plurality of the positive control switches and a plurality of the negative control switches respectively, is configured to selectively control at least one of the positive control switches and at least one of the negative control switches to be turned on simultaneously, so that the target heating element unit located between the selected positive control switch and the negative control switch starts to work.

2. The heating control circuit according to claim 1, characterized in that, It also includes a data acquisition switch circuit, one end of which is electrically connected to the positive terminal of the power supply circuit, and the other end is electrically connected to at least one of the heating element units; the controller is also configured to control the data acquisition switch circuit and the negative terminal control switch corresponding to the target heating element unit to be turned on simultaneously, thereby enabling the detection of the resistance value of the target heating element unit.

3. The heating control circuit according to claim 2, characterized in that, The acquisition switch circuit and the positive terminal control switch are not simultaneously turned on; Alternatively, the acquisition switch circuit and the positive terminal control switch may be switched on alternately under the control of the controller.

4. The heating control circuit according to claim 1, 2, or 3, characterized in that, The plurality of heating element units include a heating branch formed by at least two heating element units connected in series, and the negative terminal control switch and the positive terminal control switch are alternately connected between the plurality of heating element units.

5. The heating control circuit according to claim 4, characterized in that, The heating element unit includes at least two heating elements connected in parallel; multiple heating element units are distributed in at least two different locations.

6. The heating control circuit according to claim 2 or 3, characterized in that, The data acquisition switch circuit includes: A data acquisition switch, one end of which is electrically connected to the positive terminal of the power supply circuit; A sampling resistor is electrically connected between the other end of the acquisition switch and at least one of the heating element units. A first sampling node and a second sampling node are respectively provided at both ends of the sampling resistor. Both the first sampling node and the second sampling node are electrically connected to the controller, so that the controller is also configured to calculate the resistance value of the target heating element unit based on the voltage of the first sampling node and the second sampling node when the acquisition switch circuit and the negative terminal control switch corresponding to the target heating element unit are simultaneously turned on.

7. The heating control circuit according to claim 6, characterized in that, Each of the heating element units has two heating element sampling nodes at both ends, and two adjacent heating element units share one heating element sampling node; When the second sampling node is located between the first heating element unit and the first negative terminal control switch, the second sampling node serves as one of the heating element sampling nodes of the first heating element unit; The heating element sampling nodes are all electrically connected to the controller, which is further configured to detect the resistance value of the target heating element unit based on the voltage of the first sampling node, the voltage of the second sampling node, and the voltages of the two heating element sampling nodes respectively set at both ends of the target heating element unit.

8. The heating control circuit according to claim 6, characterized in that, When the first heating element unit is electrically connected between the second sampling node and the first negative terminal control switch, the second sampling node serves as the heating element sampling node of the first heating element unit; Each of the remaining heating element units has two heating element sampling nodes at both ends, and two adjacent heating element units share one heating element sampling node; The heating element sampling nodes are all electrically connected to the controller, which is further configured to detect the resistance value of the target heating element unit based on the voltage of the first sampling node, the voltage of the second sampling node, and the voltage of the heating element sampling node corresponding to the target heating element unit.

9. The heating control circuit according to claim 1, characterized in that, The power supply circuit includes at least two batteries connected in parallel or in series.

10. An aerosol generating device, characterized in that, Includes the heating control circuit as described in any one of claims 1-9.

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