Constant power output method, circuit and aerosol generating device

Abstract

This invention provides a constant power output method, circuit, and aerosol generating device. The constant power output method includes acquiring a first load voltage of the heating element of the aerosol generating device under a first preset condition, and calculating a first digital signal of the heating element under the first preset condition based on the first load voltage, wherein the first digital signal corresponds to the resistance of the heating element; acquiring a second load voltage of the heating element of the aerosol generating device under a second preset condition, and calculating a second digital signal of the heating element under the second preset condition based on the second load voltage, wherein the second digital signal corresponds to the voltage of the heating element; calculating a first control signal based on the first and second digital signals, and driving the switching module of the aerosol generating device to conduct through the first control signal. This invention can achieve constant power output and improve the user's suction experience.

Description

Technical Field

[0001] This invention relates to the field of aerosol technology, specifically to a constant power output method, circuit, and aerosol generating device. Background Technology

[0002] Aerosol generators work by heating an internal heating element to atomize e-liquid and produce an aerosol for the user to inhale. With the development of aerosol generators, they have evolved from on / off type to constant voltage output type. Constant voltage output type aerosol generators sample the load; when the output voltage across the load changes, they adjust the duty cycle of the PWM signal to keep the output voltage across the load constant.

[0003] However, when the battery voltage of the aerosol generator changes, even if current constant-voltage output aerosol generators can maintain a constant output voltage, their output power will change, thus affecting the user's vaping experience. Aerosol generators work by heating an internal heating element to atomize e-liquid and produce an aerosol for the user to inhale. With the development of aerosol generators, they have evolved from on / off aerosol generators to constant-voltage output aerosol generators. Constant-voltage output aerosol generators sample the load; when the output voltage across the load changes, they adjust the duty cycle of the PWM signal to keep the output voltage across the load constant. Summary of the Invention

[0004] This invention provides a constant power output method, circuit, and aerosol generating device, aiming to solve the problem that current aerosol generating devices cannot achieve constant power output.

[0005] In a first aspect, the present invention provides a constant power output method applied to an aerosol generating device, the method comprising:

[0006] The first load voltage of the heating element of the aerosol generating device under a first preset condition is obtained, and the first digital signal of the heating element under the first preset condition is calculated based on the first load voltage, wherein the first digital signal corresponds to the resistance of the heating element;

[0007] The second load voltage of the heating element of the aerosol generating device under the second preset condition is obtained, and the second digital signal of the heating element under the second preset condition is calculated based on the second load voltage, wherein the second digital signal corresponds to the magnitude of the voltage of the heating element;

[0008] A first control signal is calculated based on the first digital signal and the second digital signal, and the switching module of the aerosol generating device is turned on by the first control signal.

[0009] Secondly, the present invention provides a constant power output circuit applied to an aerosol generating device. The constant power output circuit includes a resistance detection module, a voltage detection module, a calculation module, and a drive module. The input terminal of the resistance detection module is connected to the heating element of the aerosol generating device, and is used to provide a first preset condition for the heating element, and calculate a first digital signal based on a first load voltage across the heating element under the first preset condition, wherein the first digital signal corresponds to the resistance of the heating element. The input terminal of the voltage detection module is connected to the heating element, and is used to calculate a second digital signal based on a second load voltage across the heating element under a second preset condition, wherein the second digital signal corresponds to the voltage of the heating element. One input terminal of the calculation module is connected to the output terminal of the resistance detection module, and the other input terminal of the calculation module is connected to the output terminal of the voltage detection module, and is used to generate a drive signal based on the first digital signal and the second digital signal. The input terminal of the drive module is connected to the output terminal of the calculation module, and the output terminal of the drive module is connected to the switching module of the aerosol generating device, and is used to drive the switching module to conduct according to the drive signal.

[0010] Further, the resistance detection module includes a current generation circuit, an integration module, a first comparator, a first adder, and a first control signal generation circuit; one input terminal of the integration module is connected to a first voltage source to receive a first reference voltage provided by the first voltage source, and the output terminal of the integration module is connected to the input terminal of the first comparator; the input terminal of the current generation circuit is connected to a second voltage source to receive a second reference voltage provided by the second voltage source, and the output terminal of the current generation circuit is connected to the other input terminal of the integration module and the heating element, respectively, to provide the first preset condition for the heating element; the output terminal of the first comparator is connected to the input terminal of the first adder, and the output terminal of the first adder is connected to the input terminal of the first control signal generation circuit and the arithmetic module, respectively; the output terminal of the first control signal generation circuit is connected to the integration module.

[0011] Furthermore, the integration module includes a first integration circuit and a second integration circuit; the input terminal of the first integration circuit is connected to the current generation circuit, and the output terminal of the first integration circuit is connected to the first comparator; the input terminal of the second integration circuit is connected to the second voltage source, and the output terminal of the second integration circuit is connected to the first comparator, and both the first integration circuit and the second integration circuit are also connected to the first control signal generation circuit.

[0012] Furthermore, the current generation circuit includes a first operational amplifier, a first switching transistor, a second switching transistor, and a first resistor; one input terminal of the first operational amplifier is connected to the first voltage source, the other input terminal of the first operational amplifier is grounded through the first resistor, and the output terminal of the first operational amplifier is connected to the controlled terminals of the first switching transistor and the second switching transistor, respectively; the first terminal of the first switching transistor is connected to the first terminal of the second switching transistor, the second terminal of the first switching transistor is connected to the first resistor, and the second terminal of the second switching transistor is connected to the heating element and the integrating module, respectively.

[0013] Furthermore, the voltage detection module includes a sampling circuit, a third integrating circuit, a fourth integrating circuit, a second comparator, a second adder, and a second control signal generation circuit; the input terminal of the sampling circuit is connected to the heating element, the output terminal of the sampling circuit is connected to the input terminal of the third integrating circuit, and the output terminal of the third integrating circuit is connected to the second comparator; the input terminal of the fourth integrating circuit is connected to the third voltage source, and the output terminal of the fourth integrating circuit is connected to the second comparator; the output terminal of the second comparator is connected to the input terminal of the second adder, and the output terminal of the second adder is connected to both the input terminal of the second control signal generation circuit and the input terminal of the arithmetic module; the output terminal of the second control signal generation circuit is connected to both the third integrating circuit and the fourth integrating circuit.

[0014] Furthermore, the arithmetic module includes a multiplication circuit and a drive signal generation circuit; the input terminal of the multiplication circuit is connected to the resistance detection module and the voltage detection module respectively, the output terminal of the multiplication circuit is connected to the input terminal of the drive signal generation circuit, and the output terminal of the drive signal generation circuit is connected to the drive module.

[0015] Thirdly, the present invention provides an aerosol generating device, the aerosol generating device comprising the constant power output circuit described in any of the above claims.

[0016] The constant power output method disclosed in this invention includes: acquiring a first load voltage of the heating element of the aerosol generating device under a first preset condition, and calculating a first digital signal of the heating element under the first preset condition based on the first load voltage, wherein the first digital signal corresponds to the resistance of the heating element; acquiring a second load voltage of the heating element of the aerosol generating device under a second preset condition, and calculating a second digital signal of the heating element under the second preset condition based on the second load voltage, wherein the second digital signal corresponds to the voltage of the heating element; calculating a first control signal based on the first digital signal and the second digital signal, and driving the switching module of the aerosol generating device to conduct through the first control signal; the aerosol generating device disclosed in this invention includes a constant power output circuit, which includes a resistance detection module, a voltage detection module, a calculation module, and a driving module. The resistance detection module can acquire the first load voltage of the heating element under the first preset condition and obtain the corresponding first digital signal. The voltage detection module can acquire the second load voltage of the heating element under the second preset condition and obtain the corresponding second digital signal. The calculation module obtains a driving signal based on the first digital signal and the second digital signal. The driving module drives the switching module based on the driving signal to achieve constant power output. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a flowchart of a constant power output method provided in an embodiment of the present invention;

[0019] Figure 2 This is a block diagram of a constant power output circuit provided in an embodiment of the present invention;

[0020] Figure 3 This is a block diagram of a resistance detection module provided in an embodiment of the present invention;

[0021] Figure 4 This is a circuit diagram of a current generation circuit provided in an embodiment of the present invention;

[0022] Figure 5 This is a block diagram of a voltage detection module provided in an embodiment of the present invention;

[0023] Figure 6 This is a block diagram of a computing module provided in an embodiment of the present invention. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] It should be understood that, when used in this specification and the appended claims, the terms “comprising” and “including” indicate the presence of the described features, integrals, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, operations, elements, components and / or collections thereof.

[0026] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0027] Furthermore, the directional terms used in this invention, such as "up," "down," "front," "back," "left," "right," "inner," "outer," and "side," are merely for reference to the accompanying drawings and the product's usage state. Therefore, the directional terms used are for illustrating and understanding this invention, and not for limiting it. Additionally, in the accompanying drawings, structures that are similar or identical are indicated by the same reference numerals.

[0028] See Figure 1 The constant power output method provided by this invention is used to control an aerosol generating device. It can be integrated into the control chip of the aerosol generating device to achieve constant power output, thereby improving the user experience. Figure 1 As shown, the constant power output method includes steps S110-S130.

[0029] S110, obtain the first load voltage of the heating element of the aerosol generating device under the first preset condition, and calculate the first digital signal of the heating element under the first preset condition based on the first load voltage, wherein the first digital signal corresponds to the resistance of the heating element.

[0030] In this embodiment of the invention, the heating element may be a heating wire used to heat the atomizing module of the aerosol generating device, thereby atomizing the e-liquid in the atomizing module to generate an aerosol for the user to inhale. In addition to the heating element for heating and the atomizing module for atomization, the aerosol generating device may also include a switching circuit for controlling the on and off states of the heating element. The switching circuit may include switching elements, such as transistors, MOSFETs, relays, etc.

[0031] The first preset condition can be to provide a fixed current to the heating element through a current generating circuit, and detect the voltage across the heating element under the fixed current to obtain a first load voltage. After obtaining the first load voltage, the first load voltage is integrated to obtain a first digital signal. The obtained first digital signal is used to reflect the resistance of the heating element under the first preset condition.

[0032] S120, acquire the second load voltage of the heating element of the aerosol generating device under the second preset condition, and calculate the second digital signal of the heating element under the second preset condition based on the second load voltage, wherein the second digital signal corresponds to the magnitude of the voltage of the heating element.

[0033] In this embodiment of the invention, the second preset condition may refer to the switch module of the aerosol generating device being in a conducting state, and the second load voltage across the heating element being acquired in this state. The second load voltage is then integrated to obtain a second digital signal, which is used to reflect the voltage magnitude of the heating element under the second preset condition.

[0034] S130, a first control signal is calculated based on the first digital signal and the second digital signal, and the switching module of the aerosol generating device is turned on by the first control signal.

[0035] In this embodiment of the invention, the first digital signal is related to the resistance of the heating element under a first preset condition, and the second digital signal is related to the voltage of the heating element under a second preset condition. The first control signal obtained from the first digital signal and the second digital signal is used to control the switching module to turn on. The first control signal can be a PWM signal, the duty cycle of which is related to the first digital signal and the second digital signal.

[0036] In some embodiments, such as this embodiment, step S110 may include the following steps:

[0037] A first reference voltage is obtained, and the first reference voltage and the first load voltage are integrated respectively to obtain a first integrated signal and a second integrated signal, wherein the first integrated signal corresponds to the first reference voltage and the second integrated signal corresponds to the first load voltage.

[0038] The first digital signal is calculated based on the first integral signal and the second integral signal.

[0039] In this embodiment of the invention, the first reference voltage can be provided by a voltage source, and the first load voltage is the voltage across the heating element under a first preset condition. An integrating circuit can then be used to integrate the first reference voltage and the first load voltage to obtain a first integrated signal and a second integrated signal, respectively. The first and second integrated signals are then input to a comparator, which compares them and outputs the corresponding result to an adder. Finally, the adder outputs a first digital signal.

[0040] In some embodiments, such as this embodiment, step S120 may include the following steps:

[0041] A second reference voltage is obtained, and the second reference voltage and the second load voltage are integrated respectively to obtain a third integral signal and a fourth integral signal, wherein the third integral signal corresponds to the second reference voltage and the fourth integral signal corresponds to the second load voltage;

[0042] The second digital signal is calculated based on the third integral signal and the fourth integral signal.

[0043] In this embodiment of the invention, the second reference voltage can also be provided by a voltage source. The second reference voltage and the second load voltage are integrated by an integrating circuit to obtain a third integrated signal and a fourth integrated signal. The third integrated signal and the fourth integrated signal are then input to a comparator. After comparison by the comparator, the output signal is sent to an adder. Finally, the adder outputs the second digital signal.

[0044] The following description is based on the constant power output circuit and constant power output method provided by the present invention.

[0045] See Figures 2 to 6 , Figure 1 This is a flowchart of a constant power output method provided in an embodiment of the present invention; Figure 2 This is a block diagram of a constant power output circuit 100 provided in an embodiment of the present invention; Figure 3 This is a block diagram of a resistance detection module 10 provided in an embodiment of the present invention; Figure 4 This is a circuit diagram of a current generation circuit 11 provided in an embodiment of the present invention; Figure 5 This is a block diagram of a voltage detection module 20 provided in an embodiment of the present invention; Figure 6 This is a block diagram of the computing module 30 provided in an embodiment of the present invention. Figure 2 As shown, the constant power output circuit 100 includes a resistance detection module 10, a voltage detection module 20, a calculation module 30, and a drive module 40. The input terminal of the resistance detection module 10 is connected to the heating element 200 of the aerosol generating device, and is used to provide a first preset condition for the heating element 200, and calculate a first digital signal based on a first load voltage across the heating element 200 under the first preset condition, wherein the first digital signal corresponds to the resistance of the heating element 200. The input terminal of the voltage detection module 20 is connected to the heating element 200, and is used to calculate a first digital signal based on a first load voltage across the heating element 200 under a second preset condition. The second load voltage at both ends is used to calculate a second digital signal, wherein the second digital signal corresponds to the magnitude of the voltage of the heating element 200; one input terminal of the arithmetic module 30 is connected to the output terminal of the resistance detection module 10, and the other input terminal of the arithmetic module 30 is connected to the output terminal of the voltage detection module 20, for generating a drive signal based on the first digital signal and the second digital signal; the input terminal of the drive module 40 is connected to the output terminal of the arithmetic module 30, and the output terminal of the drive module 40 is connected to the switch module 300 of the aerosol generating device, for driving the switch module 300 to conduct according to the drive signal.

[0046] In this embodiment of the invention, the constant power output circuit 100 includes a resistance detection module 10, a voltage detection module 20, a calculation module 30, and a driving module 40. The resistance detection module 10 is connected to the heating element 200 and is used to provide a first preset condition for the heating element 200. The first preset condition may be to provide a fixed current to the heating element 200, detect a first load voltage of the heating element 200 under the fixed current, and then calculate a first digital signal based on the first load voltage. The first digital signal is used to feedback the resistance of the heating element 200.

[0047] The voltage detection module 20 is connected to the heating element 200 and is used to detect the voltage of the heating element 200 under a second preset condition to obtain a second load voltage. The second preset condition may be that the switch module 300 is in the on state. When the switch module 300 is in the on state, the voltage across the heating element 200 is detected to obtain the second load voltage, and a second digital signal is calculated based on the second load voltage.

[0048] The input terminals of the arithmetic module 30 are connected to the resistance detection module 10 and the voltage detection module 20, respectively, to receive the first digital signal and the second digital signal, generate a drive signal based on the first digital signal and the second digital signal, and then send the drive signal to the drive module 40. The drive module 40 controls the switch module 300 to conduct according to the drive signal, thereby achieving constant power output.

[0049] See Figure 3 and Figure 4 As a further embodiment, the resistance detection module 10 includes a current generation circuit 11, an integration module, a first comparator 13, a first adder 14, and a first control signal generation circuit 15; one input terminal of the integration module is connected to a first voltage source to receive a first reference voltage provided by the first voltage source, and the output terminal of the integration module is connected to the input terminal of the first comparator 13; the input terminal of the current generation circuit 11 is connected to a second voltage source to receive a second reference voltage provided by the second voltage source, and the output terminal of the current generation circuit 11 is connected to the other input terminal of the integration module and the heating element 200 to provide the first preset condition for the heating element 200; the output terminal of the first comparator 13 is connected to the input terminal of the first adder 14, and the output terminal of the first adder 14 is connected to the input terminal of the first control signal generation circuit 15 and the arithmetic module 30; the output terminal of the first control signal generation circuit 15 is connected to the integration module; further, the integration module includes a first integration circuit 121 and a second integration circuit 122; the first integration circuit 121... The input terminal of 21 is connected to the first voltage source, and the output terminal of the first integrator 121 is connected to the first comparator 13; the input terminal of the second integrator 122 is connected to the current generation circuit 11, and the output terminal of the second integrator 122 is connected to the first comparator 13. Both the first integrator 121 and the second integrator 122 are also connected to the first control signal generation circuit 15. Further, the current generation circuit 11 includes a first operational amplifier U1, a first switching transistor Q1, a second switching transistor Q2, and a first resistor R1. One input terminal of the first operational amplifier U1 is connected to the first voltage source, and the other input terminal of the first operational amplifier is grounded through the first resistor R1. The output terminal of the first operational amplifier U1 is connected to the controlled terminal of the first switching transistor Q1 and the controlled terminal of the second switching transistor Q2, respectively. The first terminal of the first switching transistor Q1 is connected to the first terminal of the second switching transistor Q2, the second terminal of the first switching transistor Q1 is connected to the first resistor R1, and the second terminal of the second switching transistor Q2 is connected to the heating element 200 and the integrator module, respectively.

[0050] The resistance detection module 10 includes a current generation circuit 11, a first integrating circuit 121, a second integrating circuit 122, a first comparator 13, a first adder 14, and a first control signal generation circuit 15. The first integrating circuit 121 is connected to a first voltage source, the second integrating circuit 122 is connected to the current generation circuit 11, and the current generation circuit 11 is connected to a second voltage source. Under the control of the first control signal, the first reference voltage is used to generate a first integrated signal via the first integrating circuit 121. The first integrated signal is proportional to the duty cycle of the first control signal. The second reference voltage, after passing through the current generation circuit 11, generates a fixed current, which is supplied to the heating element 200 to obtain the first load voltage across the heating element 200. Under the control of the first control signal, this first load voltage is used to generate a second integrated signal via the second integrating circuit 122. The first and second integrated signals are output to the first adder 14 via the first comparator 13. The first adder 14 can be an N-bit adder. After performing addition or subtraction under the control of the first comparator 13, the first adder 14 outputs a first digital signal. The first digital signal is input to the first control signal generation circuit 15 to generate a first control signal. The generated first control signal continues to act on the first integrator circuit 121 and the second integrator circuit 122. When the loop is stable, the first integrator signal and the second integrator signal are equal, and the output of the first adder 14 is fixed.

[0051] Taking the following example: the first reference voltage provided by the first voltage source is VREF1, the second reference voltage provided by the second voltage source is VREF2, the integration coefficient of the first integrator 121 is KC_REF1, the first integration signal output by the first integrator 121 is VC_REF1, the integration coefficient of the second integrator 122 is KC_AT1, the second integration signal output by the second integrator 122 is VC_AT1, the first digital signal output by the first adder 14 is NR, and the duty cycle of the first control signal PWM1 is DR, we have:

[0052] V C_REF1 =V REF1 *D R *K C_REF1 (1)

[0053] Under the first preset condition, the first load voltage across the heating element 200 is V. AT1 Then, the second integral voltage obtained by integrating the first load voltage within the period corresponding to the first control signal PWM1 is V. C_AT1 for:

[0054] V C_AT1 =V AT1 *K C_AT1 (2)

[0055] When the loop in the resistance sensing circuit reaches a stable state, the first integrated signal and the second integrated signal are equal, i.e., V C_REF1 =V C_AT1 Let the integration coefficient K of the first integrator circuit 121 be... C_REF1 The integration coefficient K of the second integrator circuit 122 C_AT1 If they are equal, we can obtain:

[0056] V REF1 *D R *K C_REF1 =V AT1 *K C_AT1 (3)

[0057] From equation (3), we can obtain:

[0058] V REF1 *D R =V AT1 (4)

[0059] like Figure 4 As shown, one input terminal of the first operational amplifier U1 is used to receive the second reference voltage V. REF2 In one embodiment of the heating element 200, the resistor RL is... Figure 4 The circuit shown yields:

[0060] V AT1 =V REF2 / R1*M1*RL (5)

[0061] From equations (4) and (5), we can obtain:

[0062] D R =M1*(V REF2 / V REF1 )*(RL / R1) (6)

[0063] Where RL is the resistance of heating element 200, and D R M1 represents the duty cycle of the first control signal, R1 represents the resistance of the first resistor R1, and M1 and V... REF2 V REF1 Since R1 is a constant, it can be seen from equation (6) that the resistance RL of the heating element 200 is related to the duty cycle D of the first control signal. R The resistance RL of the heating element 200 is inversely proportional to the first digital signal, which is generated based on the first digital signal.

[0064] See Figure 5As a further embodiment, the voltage detection module 20 includes a sampling circuit 21, a third integrating circuit 22, a fourth integrating circuit 23, a second comparator 24, a second adder 25, and a second control signal generation circuit 26. The input terminal of the sampling circuit 21 is connected to the heating element 200, the output terminal of the sampling circuit 21 is connected to the input terminal of the third integrating circuit 22, and the output terminal of the third integrating circuit 22 is connected to the second comparator 24. The input terminal of the fourth integrating circuit 23 is connected to a third voltage source, and the output terminal of the fourth integrating circuit 23 is connected to the second comparator 24. The output terminal of the second comparator 24 is connected to the input terminal of the second adder 25, and the output terminal of the second adder 25 is connected to the input terminal of the second control signal generation circuit 26 and the input terminal of the arithmetic module 30, respectively. The output terminal of the second control signal generation circuit 26 is connected to the third integrating circuit 22 and the fourth integrating circuit 23, respectively.

[0065] The sampling circuit 21 acquires the second load voltage when the switch module 300 is in the ON position. On one hand, under the control of the second control signal, the second load voltage generates a third integral signal via the third integrator circuit 22. On the other hand, under the control of the second control signal, the third reference voltage generates a fourth integral signal via the fourth integrator circuit 23. The third and fourth integral signals are output to the second adder 25 via the second comparator 24. The second adder 25 performs addition or subtraction under the control of the second comparator 24 to generate a second digital signal. The second digital signal generates a second control signal via the second control signal generation circuit 26. The generated second control signal acts on the third integrator circuit 22 and the fourth integrator circuit 23. When the loop is stable, the third and fourth integral signals are equal.

[0066] With the second load voltage as V AT2 The sampling ratio of sampling circuit 21 is K. S The integration coefficient of the third integral signal is K. C_AT2 The third integral signal is V C_AT2 The integration coefficient of the fourth integral signal is K. C_REF3 The fourth integral signal is V C_REF3 The duty cycle of the second control signal PWM2 is D. V Taking this as an example, the third integral signal is:

[0067] V C_AT2 =Ks*V AT2 *D V *K c_AT2 (7)

[0068] The fourth integral signal is:

[0069] VC_REF3 =V REF3 *K c_REF3 (8)

[0070] When the third and fourth integral coefficients are equal, that is, K c_AT2 =K c_REF3 When the feedback loop reaches a stable state, V C_AT2 =V C_REF3 That is, the third integral signal and the fourth integral signal are equal. After simplifying equations (7) and (8), we can obtain:

[0071] Ks*V AT2 *D V =V REF3 (9)

[0072] By transforming equation (9), we can obtain:

[0073] D V =V REF3 / (Ks*V AT2 (10)

[0074] In equation (10), Ks is the sampling ratio, and V REF3 The third reference voltage is used, and both are constants, that is, V. AT2 With D V The duty cycle D of the second control signal is inversely proportional to the second digital signal, which is generated by the second digital signal. V It can be represented by a second digital signal.

[0075] The periodic equivalent power P of heating element 200 OUT For load power P OUT1 Multiply by the duty cycle D of the control signal that controls the switching module 300 to turn on. SW ,Right now:

[0076] P OUT =(V AT2 2 / RL)*D SW (11)

[0077] Substituting equations (6) and (10) into equation (11) yields:

[0078] D SW =[(P OUT *R1*Ks 2 *V REF1 ) / (M1*V REF3 2 *V REF2 )]*D R *D V 2 (12)

[0079] Let [(P) OUT *R1*Ks 2 *V REF1 ) / (M1*V REF3 2 *V REF2 [] = K, where K is the coefficient term. For ease of calculation, we can let K = 2. n If n is an integer, that is, K is a constant, then simplifying equation (12) gives:

[0080] D SW =K*D R *D V 2 (13)

[0081] The drive signal is used to control the switching on and off of the conduction module; that is, the duty cycle of the drive signal is D. SW When the duty cycle of the driving signal satisfies equation (12), we have:

[0082] P OUT =[(M1*V REF3 2 *V REF2 ) / (R1*Ks 2 *V REF1 )]*K (14)

[0083] As shown in (14), the periodic equivalent power of the heating element 200 is only related to constants such as M1, Ks, K, and R1, as well as the first reference voltage, the second reference voltage, and the third reference voltage, and is independent of the load voltage and resistance of the heating element 200. When it is necessary to adjust the output power, any parameter in equation (14) can be adjusted to change the output power.

[0084] See Figure 6 As a further embodiment, the arithmetic module 30 includes a multiplication circuit 31 and a drive signal generation circuit 32; the input terminal of the multiplication circuit 31 is connected to the resistance detection module 10 and the voltage detection module 20 respectively, the output terminal of the multiplication circuit 31 is connected to the input terminal of the drive signal generation circuit 32, and the output terminal of the drive signal generation circuit 32 is connected to the drive module 40.

[0085] The arithmetic module 30 may include a multiplication circuit 31 and a drive signal generation circuit 32. The multiplication circuit 31 is used to perform multiplication on the first digital signal and the second digital signal and output the result to the drive signal generation circuit 32. The drive signal generation circuit 32 is used to generate a drive signal based on the drive signal.

[0086] The present invention also provides an aerosol generating device, the aerosol generating device including the constant power output circuit 100 as described in any of the above embodiments, the constant power output circuit 100 including a resistance detection module 10, a voltage detection module 20, a calculation module 30 and a drive module 40; the input terminal of the resistance detection module 10 is connected to the heating element 200 of the aerosol generating device, for providing a first preset condition to the heating element 200, and calculating a first digital signal based on a first load voltage across the heating element 200 under the first preset condition, wherein the first digital signal corresponds to the resistance of the heating element 200; the input terminal of the voltage detection module 20 is connected to the heating element 200. A 0-connection is used to calculate a second digital signal based on the second load voltage across the heating element 200 under a second preset condition, wherein the second digital signal corresponds to the magnitude of the voltage of the heating element 200; one input terminal of the arithmetic module 30 is connected to the output terminal of the resistance detection module 10, and the other input terminal of the arithmetic module 30 is connected to the output terminal of the voltage detection module 20, for generating a drive signal based on the first digital signal and the second digital signal; the input terminal of the drive module 40 is connected to the output terminal of the arithmetic module 30, and the output terminal of the drive module 40 is connected to the switch module 300 of the aerosol generating device, for driving the switch module 300 to conduct according to the drive signal.

[0087] In this embodiment of the invention, the constant power output circuit 100 includes a resistance detection module 10, a voltage detection module 20, a calculation module 30, and a driving module 40. The resistance detection module 10 is connected to the heating element 200 and is used to provide a first preset condition for the heating element 200. The first preset condition may be to provide a fixed current to the heating element 200, detect a first load voltage of the heating element 200 under the fixed current, and then calculate a first digital signal based on the first load voltage. The first digital signal is used to feedback the resistance of the heating element 200.

[0088] The voltage detection module 20 is connected to the heating element 200 and is used to detect the voltage of the heating element 200 under a second preset condition to obtain a second load voltage. The second preset condition may be that the switch module 300 is in the on state. When the switch module 300 is in the on state, the voltage across the heating element 200 is detected to obtain the second load voltage, and a second digital signal is calculated based on the second load voltage.

[0089] The input terminals of the arithmetic module 30 are connected to the resistance detection module 10 and the voltage detection module 20, respectively, to receive the first digital signal and the second digital signal, generate a drive signal based on the first digital signal and the second digital signal, and then send the drive signal to the drive module 40. The drive module 40 controls the switch module 300 to conduct according to the drive signal, thereby achieving constant power output.

[0090] The constant power output method, circuit, and aerosol generating device disclosed in this invention achieve constant power output by acquiring a first digital signal of a heating element under a first preset condition and a second digital signal under a second preset condition, generating a drive signal based on the first and second digital signals, and controlling the switching module to turn on and off through the drive signal.

[0091] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A constant power output method, characterized in that, Applied to an aerosol generating device, the method includes: The first load voltage of the heating element of the aerosol generating device under a first preset condition is obtained, and the first digital signal of the heating element under the first preset condition is calculated based on the first load voltage, wherein the first digital signal corresponds to the resistance of the heating element; The second load voltage of the heating element of the aerosol generating device under the second preset condition is obtained, and the second digital signal of the heating element under the second preset condition is calculated based on the second load voltage, wherein the second digital signal corresponds to the magnitude of the voltage of the heating element; A first control signal is calculated based on the first digital signal and the second digital signal, and the switching module of the aerosol generating device is turned on by the first control signal. The step of calculating the first digital signal of the heating element under the first preset condition based on the first load voltage includes: A first reference voltage is obtained, and the first reference voltage and the first load voltage are integrated respectively to obtain a first integrated signal and a second integrated signal, wherein the first integrated signal corresponds to the first reference voltage and the second integrated signal corresponds to the first load voltage. The first digital signal is calculated based on the first integral signal and the second integral signal; The step of calculating the second digital signal of the heating element under the second preset condition based on the second load voltage includes: A second reference voltage is obtained, and the second reference voltage and the second load voltage are integrated respectively to obtain a third integral signal and a fourth integral signal, wherein the third integral signal corresponds to the second reference voltage and the fourth integral signal corresponds to the second load voltage; The second digital signal is calculated based on the third integral signal and the fourth integral signal.

2. A constant power output circuit, characterized in that, Applications in aerosol generating devices, including: A resistance detection module, the input terminal of which is connected to the heating element of the aerosol generating device, is used to provide a first preset condition for the heating element, and calculate a first digital signal based on a first load voltage across the heating element under the first preset condition, wherein the first digital signal corresponds to the resistance of the heating element. A voltage detection module, the input terminal of which is connected to the heating element, is used to calculate a second digital signal based on a second load voltage across the heating element under a second preset condition, wherein the second digital signal corresponds to the magnitude of the voltage of the heating element; An arithmetic module, one input terminal of which is connected to the output terminal of the resistance detection module, and the other input terminal of which is connected to the output terminal of the voltage detection module, is used to generate a drive signal based on the first digital signal and the second digital signal; A driving module, the input terminal of which is connected to the output terminal of the arithmetic module, and the output terminal of which is connected to the switching module of the aerosol generating device, for driving the switching module to conduct according to the driving signal.

3. The constant power output circuit as described in claim 2, characterized in that, The resistance detection module includes a current generation circuit, an integration module, a first comparator, a first adder, and a first control signal generation circuit. One input terminal of the integration module is connected to a first voltage source for receiving a first reference voltage provided by the first voltage source, and the output terminal of the integration module is connected to the input terminal of the first comparator. The input terminal of the current generation circuit is connected to the second voltage source to receive the second reference voltage provided by the second voltage source. The output terminal of the current generation circuit is connected to the other input terminal of the integration module and the heating element to provide the first preset condition for the heating element. The output of the first comparator is connected to the input of the first adder, and the output of the first adder is connected to the input of the first control signal generation circuit and the arithmetic module, respectively. The output of the first control signal generation circuit is connected to the integration module.

4. The constant power output circuit as described in claim 3, characterized in that, The integration module includes a first integration circuit and a second integration circuit; The input terminal of the first integrating circuit is connected to the first voltage source, and the output terminal of the first integrating circuit is connected to the first comparator. The input terminal of the second integrator is connected to the current generation circuit, the output terminal of the second integrator is connected to the first comparator, and both the first integrator and the second integrator are also connected to the first control signal generation circuit.

5. The constant power output circuit as described in claim 3, characterized in that, The current generation circuit includes a first operational amplifier, a first switching transistor, a second switching transistor, and a first resistor; One input terminal of the first operational amplifier is connected to the first voltage source, the other input terminal of the first operational amplifier is grounded through the first resistor, and the output terminal of the first operational amplifier is connected to the controlled terminal of the first switching transistor and the controlled terminal of the second switching transistor, respectively. The first terminal of the first switching transistor is connected to the first terminal of the second switching transistor, the second terminal of the first switching transistor is connected to the first resistor, and the second terminal of the second switching transistor is connected to the heating element and the integrating module, respectively.

6. The constant power output circuit as described in claim 2, characterized in that, The voltage detection module includes a sampling circuit, a third integrating circuit, a fourth integrating circuit, a second comparator, a second adder, and a second control signal generation circuit. The input terminal of the sampling circuit is connected to the heating element, the output terminal of the sampling circuit is connected to the input terminal of the third integrating circuit, and the output terminal of the third integrating circuit is connected to the second comparator. The input terminal of the fourth integrator is connected to the third voltage source, and the output terminal of the fourth integrator is connected to the second comparator. The output of the second comparator is connected to the input of the second adder, and the output of the second adder is connected to the input of the second control signal generation circuit and the input of the arithmetic module, respectively. The output terminal of the second control signal generation circuit is connected to the third integrator circuit and the fourth integrator circuit, respectively.

7. The constant power output circuit as described in claim 2, characterized in that, The arithmetic module includes a multiplication circuit and a drive signal generation circuit; The input terminal of the multiplication circuit is connected to the resistance detection module and the voltage detection module, respectively. The output terminal of the multiplication circuit is connected to the input terminal of the drive signal generation circuit, and the output terminal of the drive signal generation circuit is connected to the drive module.

8. An aerosol generating device, characterized in that, Includes the constant power output circuit as described in any one of claims 2-7.

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