Heating wire power control method, heating wire power control circuit and electronic cigarette

Abstract

The present invention provides a heating wire power control method, a heating wire power control circuit, and an electronic cigarette, and relates to the technical field of smoking utensils. The heating wire power control method of the present invention includes S1: obtaining the driving voltage of the heating wire and the battery power supply voltage; S2: comparing the driving voltage of the heating wire and the battery power supply voltage; S3: selecting the driving voltage mode; S4: obtaining the duty cycle of the pulse width modulation signal; S5: controlling the driving voltage output of the heating wire. The heating wire power control circuit of the present invention includes a first pulse width modulation signal detection module, a second pulse width modulation signal receiving module, a driving voltage output module, and a driving voltage control module. The electronic cigarette of the present invention includes the aforementioned heating wire power control circuit. The heating wire power control circuit, the heating wire power control method, and the electronic cigarette of the present invention can solve the technical problems in the prior art that the driving voltage output mode for driving the heating wire is single and the battery cannot match the target output voltage.

Description

Technical Field

[0001] The present invention belongs to the technical field of smoking articles, and in particular relates to a heating wire power control method, a heating wire power control circuit and an electronic cigarette. Background Art

[0002] An electronic cigarette consists of two parts: a cigarette holder and a cigarette cartridge. The cigarette cartridge includes an atomizer. The heating wire in the atomizer generates heat when energized. The heat generated by the heating wire is used to atomize the oil in the cigarette cartridge to form smoke. The smoke flows through the flue provided in the cigarette cartridge to the smoking port of the cigarette holder for the user to inhale. In order to fully atomize the oil, the power of the heating wire needs to be accurately controlled. Since the existing technology has a single driving voltage output mode for driving the heating wire, and the target output voltage required by the battery and the heating wire in the power control process during actual use of the electronic cigarette does not match, the output voltage of the heating wire cannot reach the ideal target voltage value, resulting in the oil not being well atomized, which seriously affects the taste of the electronic cigarette. Summary of the Invention

[0003] In view of this, the present invention provides a heating wire power control method, a heating wire power control circuit and an electronic cigarette to solve the technical problems in the prior art that the driving voltage output mode for driving the heating wire is single and the battery cannot match the target output voltage.

[0004] In order to solve the above problems, the technical solution adopted by the present invention is:

[0005] In a first aspect, the present invention provides a method for controlling heating wire power, comprising the following steps:

[0006] S1: Get the driving voltage of the heating wire and the battery supply voltage;

[0007] S2: Compare the driving voltage of the heating wire and the battery supply voltage to obtain a first comparison result;

[0008] S3: Selecting a driving voltage mode according to the first comparison result;

[0009] S4: Obtain the duty cycle of the pulse width modulation signal;

[0010] S5: Control the driving voltage output of the heating wire according to the duty cycle of the pulse width modulation signal and the selected driving voltage mode.

[0011] Preferably, the driving voltage mode includes a buck output mode, a boost output mode, and an equal-sum complementary output mode. The output voltage of the buck output mode is less than the supply voltage of the battery. The output voltage of the boost output mode is greater than the supply voltage of the battery. The output voltage of the equal-sum complementary output mode is within the range of [Vbat - V1, Vbat + V2]. S5 controls the driving voltage output of the heating wire according to the duty cycle of the pulse width modulation signal and the selected driving voltage mode, including:

[0012] S510: Obtain the target driving voltage of the heating wire;

[0013] S520: Determine the duty cycle of the pulse width modulation signal according to the target driving voltage of the heating wire;

[0014] S530: Obtain the actual driving voltage of the heating wire;

[0015] S540: Adjust the duty cycle of the pulse width modulation signal according to the actual driving voltage and the target driving voltage of the heating wire;

[0016] S550: Control the driving voltage output of the heating wire according to the adjusted duty cycle of the pulse width modulation signal.

[0017] Preferably, let the battery voltage be Vbat, the driving voltage of the heating wire be VOUT in volts (V), the first voltage threshold be V1, and the second voltage threshold be V2. S3 selects the driving voltage mode according to the first comparison result, including:

[0018] When VOUT < Vbat - V1, select the buck output mode for the driving voltage;

[0019] When Vbat - V1 ≤ VOUT ≤ Vbat + V2, select the equal-sum complementary output mode for the driving voltage;

[0020] When VOUT > Vbat + V2, select the boost output mode for the driving voltage.

[0021] Preferably, when the driving voltage mode is the buck output mode, the pulse width modulation signal includes a first pulse width modulation signal. S5 controls the driving voltage output of the heating wire according to the duty cycle of the pulse width modulation signal and the selected driving voltage mode, including:

[0022] S511: Determine the first charging time for the battery to charge the energy storage element and the first discharging time for the energy storage element to discharge according to the duty cycle of the first pulse width modulation signal;

[0023] S512: Control the battery to charge the energy storage element according to the first charging time;

[0024] S513: Controlling the energy storage element to supply power to the heating wire alone according to the first discharge time;

[0025] S514: Repeat steps S512 to S513.

[0026] Preferably, when the driving voltage mode is a boost output mode, the pulse width modulation signal includes a second pulse width modulation signal, wherein S5 controls the driving voltage output of the heating wire according to the duty cycle of the pulse width modulation signal and the selected driving voltage mode, including:

[0027] S521: Determine a second charging time for the battery to charge the energy storage element and a second discharging time for the energy storage element to discharge according to the duty cycle of the second pulse width modulation signal;

[0028] S522: Controlling the battery to charge the energy storage element according to the second charging time;

[0029] S523: Controlling the battery and the energy storage element to simultaneously supply power to the heating wire according to the second discharge time;

[0030] S524: Repeat steps S522 to S523.

[0031] Preferably, when the driving voltage mode is an equal and complementary output mode, the pulse width modulation signal includes a first pulse width modulation signal and a second pulse width modulation signal, and the sum of the duty cycle of the first pulse width modulation signal and the duty cycle of the second pulse width modulation signal is 1, wherein S5 controls the driving voltage output of the heating wire according to the duty cycle of the pulse width modulation signal and the selected driving voltage mode, including:

[0032] S531: Determine a third charging time for the battery to charge the energy storage element and a third discharging time for the energy storage element according to the duty cycle of the first pulse width modulation signal, and determine a fourth charging time for the battery to charge the energy storage element and a fourth discharging time for the energy storage element according to the duty cycle of the second pulse width modulation signal;

[0033] S532: Controlling the battery to charge the energy storage element according to the third charging time;

[0034] S533: Controlling the energy storage element to supply power to the heating wire alone according to the third discharge time;

[0035] S534: Controlling the battery to charge the energy storage element according to the fourth charging time;

[0036] S535: Controlling the battery and the energy storage element to simultaneously supply power to the heating wire according to the fourth discharge time;

[0037] S536: Repeat S532 to S536.

[0038] In a second aspect, the present invention provides a heating wire power control circuit, comprising:

[0039] A first pulse width modulation signal detection module, configured to receive a first pulse width modulation signal;

[0040] A second pulse width modulation signal receiving module, configured to receive a second pulse width modulation signal;

[0041] Driving voltage output module, used to output the voltage to drive the heating wire;

[0042] A driving voltage control module, configured to control the magnitude of the voltage output by the driving voltage output module according to the first pulse width modulation signal and the second pulse width modulation signal;

[0043] The driving voltage control module includes a buck output control module, a complementary output control module, a boost output control module and a mode switching circuit. The mode switching circuit is used to switch between the buck output control module, the complementary output control module and the boost output control module according to the actual output driving voltage.

[0044] The driving voltage output module includes a battery power supply and an energy storage element, and the step-down output control module includes a first switch module and a second switch module. The first switch module is used to connect or disconnect the connection between the battery power supply and the energy storage element according to a first pulse width modulation signal, and the second switch module is used to connect or disconnect the connection between the battery power supply and the common ground terminal according to the first pulse width modulation signal.

[0045] Preferably, the driving voltage output module includes a battery power supply and an energy storage element, the boost output control module includes a third switch module and a fourth switch module, one end of the energy storage element is connected to the positive pole of the battery power supply, and the other end is connected to the third switch module and the fourth switch module, the third switch module is used to connect or disconnect the connection between the energy storage element and the common ground according to the second pulse width modulation signal, and the fourth switch module is used to connect or disconnect the connection between the energy storage element and the heating wire according to the second pulse width modulation signal.

[0046] Preferably, the driving voltage output module includes a battery power supply and an energy storage element, and the complementary output control module includes a first switch module, a second switch module, a third switch module and a fourth switch module. One end of the energy storage element is connected to the power battery through the first switch module, and the other end is connected to the heating wire through the fourth switch module. One end of the second switch module is connected to the end of the energy storage element connected to the first switch module, and the other end is connected to the common ground end. One end of the third switch module is connected to the end of the energy storage element connected to the fourth switch module, and the other end is connected to the common ground end.

[0047] In a third aspect, the present invention further provides an electronic cigarette, comprising the heating wire power control circuit according to the second aspect.

[0048] Beneficial Effects: The heating wire power control method of the present invention flexibly selects the driving mode of the driving voltage according to the relationship between the target driving voltage of the heating wire and the battery voltage, and accurately controls the power of the heating wire in combination with the duty cycle of the pulse width modulation signal so that the power of the heating wire can always meet the needs of the optimal atomization effect. The heating wire power control circuit of the present invention utilizes a mode switching circuit to switch between three control modules: a buck output control module, a complementary output control module, and a boost output control module, according to the relationship between the target driving voltage of the heating wire and the battery voltage. The buck output control module, the complementary output control module, and the boost output control module are used to control the voltage output of the heating wire in different situations, so that the power of the heating wire can always meet the needs of the optimal atomization effect. Since the electronic cigarette of the present invention adopts the aforementioned heating wire power control circuit, the electronic cigarette of the present invention can also ensure that the power of the heating wire can always meet the needs of the optimal atomization effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 This is a flow chart of a heating wire power control method according to embodiment 1 of the present invention;

[0050] Figure 2 This is a flowchart of the step-down output mode of Example 1 of the present invention;

[0051] Figure 3 This is a flowchart of the boost output mode of Example 1 of the present invention;

[0052] Figure 4 This is a workflow diagram of the equal and complementary output mode of Example 2 of the present invention;

[0053] Figure 5 This is a structural block diagram of a heating wire power control circuit according to embodiment 2 of the present invention;

[0054] Figure 6 This is a structural block diagram of a step-down output control module according to embodiment 2 of the present invention;

[0055] Figure 7 This is a structural block diagram of a boost output control module according to embodiment 2 of the present invention;

[0056] Figure 8 This is a structural block diagram of a complementary output control module according to embodiment 2 of the present invention;

[0057] Figure 9 This is a circuit schematic diagram of a heating wire power control circuit according to embodiment 3 of the present invention. DETAILED DESCRIPTION

[0058] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0059] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, the elements defined by the statement "including..." do not exclude the existence of additional identical elements in the process, method, article or device including the said elements. If there is no conflict, the embodiments of the present invention and the various features in the embodiments can be combined with each other, and all are within the protection scope of the present invention.

[0060] Embodiment 1:

[0061] As Figure 1 shown, the present invention provides a method for controlling the power of a heating wire, including the following steps:

[0062] S1: Obtain the driving voltage of the heating wire and the battery supply voltage;

[0063] During specific implementation, the driving voltage of the heating wire can be detected in real time. The battery supply voltage can be determined according to the actual battery specifications used.

[0064] S2: Compare the magnitudes of the driving voltage of the heating wire and the battery supply voltage to obtain a first comparison result;

[0065] In this embodiment, according to the magnitude relationship between the driving voltage and the battery supply voltage, the first comparison result is divided into three cases. Let the battery voltage be Vbat, the driving voltage of the heating wire be VOUT, with the unit of V, the first threshold voltage be V1, and the second threshold voltage be V2. The first case is when VOUT < Vbat - V1, the second case is when Vbat - V1 ≤ VOUT ≤ Vbat + V2, and the third case is when VOUT > Vbat + V2.

[0066] S3: Select a driving voltage mode according to the first comparison result;

[0067] The driving voltage mode includes three modes, namely buck output mode, boost output mode and equal-sum complementary output mode. The output voltage of the buck output mode is less than the supply voltage of the battery. The output voltage of the boost output mode is greater than the average supply voltage of the battery. The output voltage of the equal-sum complementary output mode is within the range of [Vbat - V1, Vbat + V2].

[0068] Selecting the driving voltage mode according to the first comparison result is specifically as follows:

[0069] When VOUT < Vbat - V1, the selected driving voltage mode is the buck output mode;

[0070] When Vbat - V1 ≤ VOUT ≤ Vbat + V2, the selected driving voltage mode is the equal-sum complementary output mode. The equal-sum complementary output mode means that the sum of the duty cycles of the first pulse width modulation signal and the second pulse width modulation signal is 1. Due to the internal resistance of devices such as field effect transistors, voltage loss will occur. Therefore, when the supply voltage of the battery changes near the target voltage, simply using the boost mode or the buck mode will result in low control accuracy of the heating voltage and the actual output voltage cannot meet the requirements of the target voltage. For this reason, the equal-sum complementary output mode is adopted in this embodiment to improve the control accuracy, so that when the supply voltage of the battery changes near the target voltage, the actual output voltage can also meet the requirements between the target output voltages.

[0071] In this embodiment, based on the target output voltage, the supply voltage of the battery is divided into three intervals, and different modes are used in different intervals to control the voltage output, so that the output voltage is always consistent with the target output voltage that meets the power regulation.

[0072] When VOUT > Vbat + V2, the selected driving voltage mode is the boost output mode;

[0073] S4: Obtain the duty cycle of the pulse width modulation signal;

[0074] The duty cycle of the pulse width modulation signal includes the duty cycle of the first pulse width modulation signal and the duty cycle of the second pulse width modulation signal.

[0075] S5: Control the driving voltage output of the heating wire according to the duty cycle of the pulse width modulation signal and the selected driving voltage mode.

[0076] In order to improve the control accuracy of the driving voltage of the heating wire, in this embodiment, S5, controlling the driving voltage output of the heating wire according to the duty cycle of the pulse width modulation signal and the selected driving voltage mode includes:

[0077] S510: Obtain the target driving voltage of the heating wire;

[0078] S520: Determine the duty cycle of the pulse width modulation signal according to the target driving voltage of the heating wire;

[0079] S530: Obtaining the actual driving voltage of the heating wire;

[0080] S540: Adjusting the duty cycle of the pulse width modulation signal according to the actual driving voltage and the target driving voltage of the heating wire;

[0081] S550: Control the driving voltage output of the heating wire according to the adjusted duty cycle of the pulse width modulation signal.

[0082] Since there are three driving voltage modes, the control of the driving voltage of the heating wire under the three driving voltage modes is explained below respectively:

[0083] like Figure 2 As shown, when the driving voltage mode is the step-down output mode, the pulse width modulation signal includes a first pulse width modulation signal, wherein S5 controls the driving voltage output of the heating wire according to the duty cycle of the pulse width modulation signal and the selected driving voltage mode, including:

[0084] S511: Determining a first charging time for the battery to charge the energy storage element and a first discharging time for the energy storage element to discharge according to the duty cycle of the first pulse width modulation signal;

[0085] In this step, the step-down output control module determines the first charging time for the battery to charge the energy storage element and the first discharging time for the energy storage element to discharge according to the duty cycle of the first pulse width modulation signal.

[0086] S512: Controlling the battery to charge the energy storage element according to the first charging time;

[0087] In this step, the step-down output control module controls the battery to charge the energy storage element according to the first charging time.

[0088] S513: Controlling the energy storage element to supply power to the heating wire alone according to the first discharge time;

[0089] In this step, the step-down output control module controls the energy storage element to supply power to the heating wire alone according to the first discharge time;

[0090] S514: Repeat steps S512 to S513.

[0091] S512 and S513 constitute a complete control cycle, and the buck output control module repeatedly performs S512 and S513 to make the average output voltage of the buck output mode less than the battery supply voltage, and controls the power of the heating wire through the duty cycle of the first pulse width modulation signal.

[0092] like Figure 3As shown, when the driving voltage mode is the boost output mode, the pulse width modulation signal includes a second pulse width modulation signal, wherein S5 controls the driving voltage output of the heating wire according to the duty cycle of the pulse width modulation signal and the selected driving voltage mode, including:

[0093] In this step, S521: determining a second charging time for the battery to charge the energy storage element and a second discharging time for the energy storage element to discharge according to the duty cycle of the second pulse width modulation signal;

[0094] In this step, the boost output control module determines a second charging time for the battery to charge the energy storage element and a second discharging time for the energy storage element to discharge according to the duty cycle of the second pulse width modulation signal.

[0095] S522: Controlling the battery to charge the energy storage element according to the second charging time;

[0096] In this step, the boost output control module controls the battery to charge the energy storage element according to the second charging time;

[0097] S523: Controlling the battery and the energy storage element to simultaneously supply power to the heating wire according to the second discharge time;

[0098] In this step, the boost output control module controls the battery and the energy storage element to simultaneously supply power to the heating wire according to the second discharge time.

[0099] S524: Repeat steps S522 to S523.

[0100] S522 and S523 constitute a complete control cycle, and the boost output control module repeatedly performs S522 and S523 to make the average output voltage of the boost output mode greater than the battery supply voltage, and controls the power of the heating wire through the duty cycle of the first pulse width modulation signal.

[0101] like Figure 4 As shown, when the driving voltage mode is the equal and complementary output mode, the pulse width modulation signal includes a first pulse width modulation signal and a second pulse width modulation signal, and the sum of the duty cycle of the first pulse width modulation signal and the duty cycle of the second pulse width modulation signal is 1, wherein S5 controls the driving voltage output of the heating wire according to the duty cycle of the pulse width modulation signal and the selected driving voltage mode, including:

[0102] S531: Determine a third charging time for the battery to charge the energy storage element and a third discharging time for the energy storage element according to the duty cycle of the first pulse width modulation signal, and determine a fourth charging time for the battery to charge the energy storage element and a fourth discharging time for the energy storage element according to the duty cycle of the second pulse width modulation signal;

[0103] In this step, the complementary output control module determines the third charging time for the battery to charge the energy storage element and the third discharging time for the energy storage element to discharge according to the duty cycle of the first pulse width modulation signal, and determines the fourth charging time for the battery to charge the energy storage element and the fourth discharging time for the energy storage element to discharge according to the duty cycle of the second pulse width modulation signal.

[0104] S532: Controlling the battery to charge the energy storage element according to the third charging time;

[0105] In this step, the complementary output control module controls the battery to charge the energy storage element according to the third charging time.

[0106] S533: Controlling the energy storage element to supply power to the heating wire alone according to the third discharge time;

[0107] In this step, the complementary output control module controls the energy storage element to supply power to the heating wire alone according to the third discharge time.

[0108] S534: Controlling the battery to charge the energy storage element according to the fourth charging time;

[0109] In this step, the complementary output control module controls the battery to charge the energy storage element according to the fourth charging time.

[0110] S535: Controlling the battery and the energy storage element to simultaneously supply power to the heating wire according to the fourth discharge time;

[0111] In this step, the complementary output control module controls the battery and the energy storage element to simultaneously power the heating wire according to the fourth discharge time.

[0112] S536: Repeat S532 to S536.

[0113] S532 to S536 constitute a complete control cycle, and the complementary output control module repeatedly performs steps 2 to 5, and controls the power of the heating wire through the duty ratio of the first pulse width modulation signal and the second pulse width modulation signal.

[0114] The heating wire power control method of this embodiment flexibly selects the driving mode of the driving voltage according to the relationship between the target driving voltage of the heating wire and the battery voltage, and accurately controls the power of the heating wire in combination with the duty cycle of the pulse width modulation signal so that the power of the heating wire can always meet the needs of the optimal atomization effect.

[0115] Example 2

[0116] like Figure 5 As shown, the present invention also provides a heating wire power control circuit, comprising:

[0117] A first pulse width modulation signal detection module, configured to receive a first pulse width modulation signal;

[0118] A second pulse width modulation signal receiving module, configured to receive a second pulse width modulation signal;

[0119] A driving voltage output module, configured to output a voltage for driving a heating wire;

[0120] A driving voltage control module, configured to control the magnitude of the voltage output by the driving voltage output module according to a first pulse width modulation signal and a second pulse width modulation signal;

[0121] The driving voltage control module includes a buck output control module, a complementary output control module, a boost output control module, and a mode switching circuit. The mode switching circuit is configured to use the control module for the driving voltage output module to switch among three control modules, namely the buck output control module, the complementary output control module, and the boost output control module, according to the magnitude of the actually output driving voltage.

[0122] The heating wire power control circuit of this embodiment can select a control mode matching the actually output driving voltage according to the magnitude of the actually output driving voltage.

[0123] Specifically, when the battery voltage is greater than the actually output driving voltage, assuming the battery voltage is Vbat, the driving voltage of the heating wire is VOUT, the first voltage threshold is V1, and the first voltage threshold is V2.

[0124] Then when VOUT < Vbat - V1, the heating wire power control circuit operates in the buck control mode. At this time, the output voltage of the driving voltage output module is controlled to be lower than the supply voltage of the battery, so that the driving voltage output by the driving voltage output module matches the actual voltage;

[0125] When VOUT > Vbat + V2, the heating wire power control circuit operates in the boost control mode. At this time, the driving voltage of the heating wire output by the driving voltage output module is controlled to be higher than the supply voltage of the battery, so that the driving voltage output by the driving voltage output module matches the actual voltage;

[0126] When Vbat - V1 ≤ VOUT ≤ Vbat + V2, the driving voltage output module is controlled to operate in the complementary output mode. At this time, the output voltage of the driving voltage output module is within the range of [Vbat - V1, Vbat + V2], so that the driving voltage output by the driving voltage output module matches the actual voltage.

[0127] After the working mode of the driving voltage of the heating wire is determined, the control circuit controls the driving voltage of the heating wire by means of pulse width modulation according to the corresponding control mode, thereby controlling the power of the heating wire. For this, a first pulse width modulation signal detection module and a second pulse width modulation signal receiving module are provided in this embodiment, which are respectively configured to receive a first pulse width modulation signal and receive a second pulse width modulation signal.

[0128] Because the mode switching circuit is based on the actual output drive voltage, this embodiment provides a drive voltage detection module to detect the actual output drive voltage. Because the drive voltage detected by the drive voltage detection module is an analog quantity, this embodiment provides a first analog-to-digital conversion module to convert the analog quantity of the drive voltage detected by the drive voltage detection module into a corresponding digital signal, and transmit the digital signal to the mode switching circuit. The mode switching circuit selects the control mode for controlling the heating wire drive voltage based on the digital signal corresponding to the drive voltage.

[0129] Specifically, the output voltage detection module includes a voltage dividing module for dividing the driving voltage, and the voltage dividing module includes a ninth resistor R9 and a tenth resistor R10 connected in series between the driving voltage output terminal and the common ground terminal, one end of the ninth resistor R9 is connected to the driving voltage output terminal, and the other end is connected to the tenth resistor R10 and the input terminal of the first analog-to-digital conversion module.

[0130] The ninth resistor R9 and the tenth resistor R10 are connected in series to divide the heating wire drive voltage. To improve the accuracy of voltage detection, the heating wire drive voltage detection module also includes a first filtering module, which is connected in parallel with the tenth resistor R10. Specifically, the first filtering module is a forty-third capacitor C43 connected in parallel across the tenth resistor R10. This provides filtering and decoupling, stabilizing the voltage across the tenth resistor R10.

[0131] Among them, the driving voltage output module includes a power supply and an energy storage element, wherein the battery can power the energy storage element so that the energy storage element stores a certain amount of electrical energy. Then, according to the control mode of the heating wire driving voltage, the energy storage element can power the heating wire alone or together with the battery.

[0132] like Figure 6 As shown, the buck output control module includes a controller, a first switch module and a second switch module, wherein the first switch module is used to connect or disconnect the connection between the battery power supply and the energy storage element according to a first pulse width modulation signal, and the second switch module is used to connect or disconnect the connection between the battery power supply and the common ground terminal according to the first pulse width modulation signal.

[0133] When the mode switching circuit switches the heating wire voltage driving voltage control module to the buck output control module, the heating wire power control circuit operates in the buck output control mode. The control process of this mode is as follows:

[0134] In the first step, the step-down output control module determines a first charging time for the battery to charge the energy storage element and a first discharging time for the energy storage element to discharge according to the duty cycle of the first pulse width modulation signal;

[0135] In the second step, the step-down output control module controls the battery to charge the energy storage element according to the first charging time;

[0136] In the third step, the step-down output control module controls the energy storage element to supply power to the heating wire alone according to the first discharge time;

[0137] The second and third steps constitute a complete control cycle. The buck output control module repeatedly performs the second and third steps to make the average output voltage of the buck output mode less than the battery supply voltage, and controls the power of the heating wire through the duty cycle of the first pulse width modulation signal.

[0138] In the second step, the first switch module is in a closed state, and the second switch module is in an open state. This state lasts for a first charging time, so that the battery charges the energy storage element and provides electrical energy to the heating wire. The time for charging the energy storage element is the first charging time.

[0139] In the third step, the first switch module is in the open state, and the second switch module is in the closed state. This state lasts for the first discharge time. At this time, only the energy storage element provides electrical energy to the heating wire by discharging, and the discharge time of the energy storage element is the first discharge time.

[0140] like Figure 7 As shown, in this embodiment, the boost output control module includes a controller, a third switch module and a fourth switch module. One end of the energy storage element is connected to the positive pole of the battery power supply, and the other end is connected to the third switch module and the fourth switch module. The controller is used to control the third switch module to connect or cut off the connection between the energy storage element and the common ground according to the second pulse width modulation signal, and to control the fourth switch module to connect or cut off the connection between the energy storage element and the heating wire according to the second pulse width modulation signal.

[0141] When the mode switching circuit switches the heating wire voltage driving voltage control module to the boost output control module, the heating wire power control circuit operates in the boost output control mode. The control process of this mode is as follows:

[0142] In the first step, the boost output control module determines a second charging time for the battery to charge the energy storage element and a second discharging time for the energy storage element to discharge according to the duty cycle of the second pulse width modulation signal;

[0143] In the second step, the boost output control module controls the battery to charge the energy storage element according to the second charging time;

[0144] In the third step, the boost output control module controls the battery and the energy storage element to simultaneously supply power to the heating wire according to the second discharge time;

[0145] The second and third steps constitute a complete control cycle. The boost output control module repeatedly performs the second and third steps to make the average output voltage of the boost output mode greater than the battery supply voltage, and controls the power of the heating wire through the duty cycle of the first pulse width modulation signal.

[0146] In the second step, the third switch module is in a closed state, and the fourth switch module is in an open state, and this state lasts for a second charging time.

[0147] In the third step, the third switch module is in the open state, and the second switch module is in the closed state. This state lasts for the second discharge time. At this time, the energy storage element provides electrical energy to the heating wire by discharging. The discharge time of the energy storage element is the second discharge time. At the same time, the battery also provides electrical energy to the heating wire.

[0148] like Figure 8 As shown, in this embodiment, the complementary output control module includes a controller, a first switch module, a second switch module, a third switch module and a fourth switch module. One end of the energy storage element is connected to the power battery through the first switch module, and the other end is connected to the heating wire through the fourth switch module. One end of the second switch module is connected to the end of the energy storage element connected to the first switch module, and the other end is connected to the common ground end. One end of the third switch module is connected to the end of the energy storage element connected to the fourth switch module, and the other end is connected to the common ground end. The controller is used to control the switching states of the first switch module, the second switch module, the third switch module and the fourth switch module according to the first pulse width modulation signal and the second first pulse width modulation signal.

[0149] When the mode switching circuit switches the heating wire voltage driving voltage control module to the complementary output control module, the heating wire power control circuit operates in the complementary output control mode. The control process of this mode is as follows:

[0150] In the first step, the complementary output control module determines a third charging time for the battery to charge the energy storage element and a third discharging time for the energy storage element to discharge the energy storage element according to the duty cycle of the first pulse width modulation signal, and determines a fourth charging time for the battery to charge the energy storage element and a fourth discharging time for the energy storage element to discharge the energy storage element according to the duty cycle of the second pulse width modulation signal;

[0151] In the second step, the complementary output control module controls the battery to charge the energy storage element according to the third charging time;

[0152] In the third step, the complementary output control module controls the energy storage element to supply power to the heating wire alone according to the third discharge time;

[0153] In the fourth step, the complementary output control module controls the battery to charge the energy storage element according to the fourth charging time;

[0154] Step 5: The complementary output control module controls the battery and the energy storage element to simultaneously supply power to the heating wire according to the fourth discharge time;

[0155] The second to fifth steps constitute a complete control cycle, and the complementary output control module repeatedly performs the second to fifth steps and controls the power of the heating wire through the duty ratio of the first pulse width modulation signal and the second pulse width modulation signal.

[0156] In the second step, the third switch module is in a closed state, the fourth switch module is in an open state, the first switch module is in a closed state, and the second switch module is in an open state. This state lasts for a first charging time, so that the battery charges the energy storage element and provides electrical energy to the heating wire, wherein the time for charging the energy storage element is the first charging time.

[0157] In the third step, the third switch module is in a closed state, the fourth switch module is in an open state, the first switch module is in an open state, and the second switch module is in a closed state. This state lasts for the first discharge time. At this time, only the energy storage element provides electrical energy to the heating wire by discharging, and the discharge time of the energy storage element is the first discharge time.

[0158] In the fourth step, the first switch module is in a closed state, the second switch module is in an open state, the third switch module is in a closed state, and the fourth switch module is in an open state. This state lasts for a second charging time.

[0159] In the fifth step, the first switch module is in a closed state, the second switch module is in an open state, the third switch module is in an open state, and the second switch module is in a closed state. This state lasts for the second discharge time. At this time, the energy storage element provides electrical energy to the heating wire by discharging, wherein the discharge time of the energy storage element is the second discharge time, and the battery also provides electrical energy to the heating wire.

[0160] The first pulse width modulation signal and the second pulse width modulation signal are complementary pulse width modulation signals, that is, the sum of the duty cycles of the first pulse width modulation signal and the second pulse width modulation signal is 1. For example, if the duty cycle of the first pulse width modulation signal is 0.2, the corresponding duty cycle of the second pulse width modulation signal is 0.8; for example, if the duty cycle of the first pulse width modulation signal is 0.5, the corresponding duty cycle of the second pulse width modulation signal is 0.5; for example, if the duty cycle of the first pulse width modulation signal is 0.7, the corresponding duty cycle of the second pulse width modulation signal is 0.3, etc. The specific distribution of the duty cycle can be set according to the power requirements of the heating wire. As long as the sum of the duty cycles of the first pulse width modulation signal and the second pulse width modulation signal is 1, the specific values ​​of the duty cycles of the first pulse width modulation signal and the second pulse width modulation signal are not limited here.

[0161] In this embodiment, the mode switching circuit includes a first switch module, a second switch module, a third switch module, and a fourth switch module. One end of the energy storage element is connected to the power battery through the first switch module, and the other end is connected to the heating wire through the fourth switch module. One end of the second switch module is connected to the end of the energy storage element connected to the first switch module, and the other end is connected to the common ground. One end of the third switch module is connected to the end of the energy storage element connected to the fourth switch module, and the other end is connected to the common ground.

[0162] When the third switch module is normally off and the fourth switch module is normally closed, the driving voltage output module operates in a step-down mode;

[0163] At this time, the step-down output control module continuously switches the first switch module and the second switch module according to the duty cycle of the first pulse width modulation signal to control the driving voltage of the heating wire and thus control the power of the heating wire. Specifically, the first switch module is driven to be in a closed state, while the second switch module is in an open state. This state lasts for a first charging time, so that the battery charges the energy storage element and provides electrical energy to the heating wire, wherein the time for the energy storage element to charge is the first charging time. Then the first switch module is driven to be in an open state, while the second switch module is in a closed state. This state lasts for a first discharge time. At this time, only the energy storage element provides electrical energy to the heating wire by discharging, wherein the discharge time of the energy storage element is the first discharge time.

[0164] When the first switch module is normally closed and the second switch module is normally open, the driving voltage control module operates in the boost mode. At this time, the boost output control module continuously switches the third switch module and the fourth switch module according to the duty cycle of the second pulse width modulation signal to control the driving voltage of the heating wire and thus control the power of the heating wire.

[0165] Specifically, the third switch module is driven to a closed state, while the fourth switch module is driven to an open state, and this state lasts for a second charging time. Then, the third switch module is driven to an open state, while the second switch module is driven to a closed state, and this state lasts for a second discharging time. At this time, the energy storage element provides electrical energy to the heating wire by discharging, wherein the discharge time of the energy storage element is the second discharging time, and the battery also provides electrical energy to the heating wire.

[0166] When the mode switching circuit is alternately in the two states of the third switch module being normally off and the fourth switch module being normally closed and the first switch module being normally closed and the second switch module being normally open, the driving voltage output module operates in the boost mode and the complementary output mode.

[0167] Specifically, first, the third switch module is driven to be in a closed state, the fourth switch module is driven to be in an open state, the first switch module is driven to be in a closed state, and the second switch module is driven to be in an open state. This state lasts for a first charging time so that the battery charges the energy storage element and provides electrical energy to the heating wire, wherein the time for charging the energy storage element is the first charging time.

[0168] Then the third switch module remains in a closed state, and the fourth switch module remains in an open state, driving the first switch module to be in an open state, while the second switch module is in a closed state. This state lasts for the first discharge time. At this time, only the energy storage element provides electrical energy to the heating wire by discharging, and the discharge time of the energy storage element is the first discharge time.

[0169] Then, the first switch module is driven to be in a closed state, the second switch module is driven to be in an open state, the third switch module is driven to be in a closed state, and the fourth switch module is driven to be in an open state. This state lasts for a second charging time.

[0170] Finally, the first switch module remains in a closed state, the second switch module remains in an open state, driving the third switch module to be in an open state, and the second switch module is in a closed state. This state lasts for a second discharge time. At this time, the energy storage element provides electrical energy to the heating wire by discharging, wherein the discharge time of the energy storage element is the second discharge time, and the battery also provides electrical energy to the heating wire.

[0171] In addition, in this embodiment, the first switch module and / or the second switch module and / or the third switch module and / or the fourth switch module are field effect transistors, the driving voltage output module includes a battery and an energy storage element, and the energy storage element is an inductor.

[0172] Example 3

[0173] like Figure 9 As shown, in this embodiment, an IC chip is used as a controller shared by the buck output control module, the complementary output control module, the boost output control module and the mode switching circuit.

[0174] The gate of the first field-effect transistor Q1 is connected to the DRVH1 pin, the gate of the second field-effect transistor Q2 is connected to the DRVL1 pin, the gate of the third field-effect transistor Q3 is connected to the DRVL1 pin, and the gate of the fourth field-effect transistor Q4 is connected to the DRVH2 pin. A forty-ninth resistor R49 is connected between the SW2 pin and the BST2 pin, and a fourth diode D4 is connected between the forty-ninth resistor R49 and the power supply. A thirty-seventh resistor R37 is connected between the SW1 pin and the BST1 pin, and a third diode D3 is connected between the thirty-seventh resistor R37 and the power supply.

[0175] Heart_EN and PowerIC_EN are the enable pins for the VCC_12V output and PWM1 / PWM2 outputs of the circuit, which can be set to be active-high.

[0176] In this embodiment, the first threshold voltage V1 = 1V, and the second threshold voltage V2 = 1V. The first and second threshold voltages can be determined according to the actual situation and are not limited here. Generally, the threshold voltage can be selected in the range of 0.8V to 3.3V.

[0177] When Vbat > VOUT + 1 (in volts), the circuit operates in the buck mode. At this time, PWM_Boost is pulled high, the fourth field-effect transistor Q4 is normally closed, and the third field-effect transistor Q3 is normally open. The duty cycle calculated by the MCU is input to the PWM_Buck pin to drive the IC chip to continuously switch the first field-effect transistor Q1 and the second field-effect transistor Q2.

[0178] When Vbat - 1 ≤ VOUT ≤ Vbat + 1 (in volts), the circuit operates in the complementary mode. At this time, complementary PWM is input to the PWM_Boos / PWM_Buck pins to drive the IC chip to continuously switch the first field-effect transistor Q1, the second field-effect transistor Q2, the third field-effect transistor Q3, and the fourth field-effect transistor Q4.

[0179] When Vbat < VOUT - 1 (in volts), the circuit operates in the boost mode. At this time, PWM_Buck is pulled high, the first field-effect transistor Q1 is normally closed, and the second field-effect transistor Q2 is normally open. The duty cycle calculated by the MCU is input to the PWM_Boost pin to drive the IC chip to continuously switch the third field-effect transistor Q3 and the fourth field-effect transistor Q4. The IC chip can use chips such as FD2204D.

[0180] Embodiment 4

[0181] The present invention also provides an electronic cigarette, which includes the heating wire power control circuit described in Embodiment 1 or 2 or 3.

[0182] The above describes in detail the heating wire power control method, heating wire power control circuit, and electronic cigarette provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification is only an implementation method of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are similarly included in the patent protection scope of the present invention. It should not be understood as limiting the present invention.

Claims

1. A heating wire power control method, characterized in that: It includes the following steps: S1: Obtain the driving voltage of the heating wire and the battery supply voltage; S2: Compare the driving voltage of the heating wire and the battery supply voltage to obtain a first comparison result; S3: Select a driving voltage mode according to the first comparison result; S4: Obtain the duty cycle of the pulse width modulation signal; S5: Control the output of the driving voltage of the heating wire according to the duty cycle of the pulse width modulation signal and the selected driving voltage mode; The driving voltage mode includes a step-down output mode, a boost output mode, and an equal and complementary output mode. The output voltage of the step-down output mode is less than the battery supply voltage. The output voltage of the boost output mode is greater than the average battery supply voltage. The output voltage of the equal and complementary output mode is within the range of [Vbat - V1, Vbat + V2]. S5, controlling the output of the driving voltage of the heating wire according to the duty cycle of the pulse width modulation signal and the selected driving voltage mode includes: S510: Obtain the target driving voltage of the heating wire; S520: Determine the duty cycle of the pulse width modulation signal according to the target driving voltage of the heating wire; S530: Obtain the actual driving voltage of the heating wire; S540: Adjust the duty cycle of the pulse width modulation signal according to the actual driving voltage and the target driving voltage of the heating wire; S550: Control the output of the driving voltage of the heating wire according to the adjusted duty cycle of the pulse width modulation signal; When the driving voltage mode is the equal and complementary output mode, the pulse width modulation signal includes a first pulse width modulation signal and a second pulse width modulation signal, and the sum of the duty cycle of the first pulse width modulation signal and the duty cycle of the second pulse width modulation signal is 1; Let the battery voltage be Vbat, the driving voltage of the heating wire be VOUT, the first voltage threshold be V1, and the second voltage threshold be V2. S3 selecting the driving voltage mode according to the first comparison result includes: when VOUT < Vbat - V1, select the driving voltage mode as the step-down output mode; When Vbat - V1 ≤ VOUT ≤ Vbat + V2, select the driving voltage mode as the equal and complementary output mode; When VOUT > Vbat + V2, select the driving voltage mode as the boost output mode.

2. The heating wire power control method according to claim 1, wherein: When the driving voltage mode is the step-down output mode, the pulse width modulation signal includes a first pulse width modulation signal, and S5 controlling the output of the driving voltage of the heating wire according to the duty cycle of the pulse width modulation signal and the selected driving voltage mode includes: S511: Determine the first charging time for the battery to charge the energy storage element and the first discharging time for the energy storage element to discharge according to the duty cycle of the first pulse width modulation signal; S512: Control the battery to charge the energy storage element according to the first charging time; S513: Control the energy storage element to supply power to the heating wire alone according to the first discharging time; S514: Repeat steps S512 to S513.

3. The heating wire power control method according to claim 1, wherein: When the driving voltage mode is the boost output mode, the pulse width modulation signal includes a second pulse width modulation signal, and S5 controlling the output of the driving voltage of the heating wire according to the duty cycle of the pulse width modulation signal and the selected driving voltage mode includes: S521: Determining a second charging time for the battery to charge the energy storage element and a second discharging time for the energy storage element to discharge according to the duty cycle of the second pulse width modulation signal; S522: Controlling the battery to charge the energy storage element according to the second charging time; S523: Controlling the battery and the energy storage element to simultaneously supply power to the heating wire according to the second discharge time; S524: Repeat steps S522 to S523.

4. The heating wire power control circuit is characterized in that: The heating wire power control method according to any one of claims 1 to 3 is applied, wherein the control comprises: A driving voltage detection module is used to detect the actual output driving voltage; A first pulse width modulation signal detection module, configured to receive a first pulse width modulation signal; A second pulse width modulation signal receiving module, configured to receive a second pulse width modulation signal; Driving voltage output module, used to output the voltage to drive the heating wire; A driving voltage control module, configured to control the magnitude of the voltage output by the driving voltage output module according to the first pulse width modulation signal and the second pulse width modulation signal; The driving voltage control module includes a buck output control module, a complementary output control module, a boost output control module and a mode switching circuit. The mode switching circuit is used to switch between the buck output control module, the complementary output control module and the boost output control module according to the actual output driving voltage.

5. The heating wire power control circuit according to claim 4, characterized in that: The driving voltage output module includes a battery power supply and an energy storage element, and the step-down output control module includes a first switch module and a second switch module. The first switch module is used to connect or disconnect the connection between the battery power supply and the energy storage element according to a first pulse width modulation signal, and the second switch module is used to connect or disconnect the connection between the battery power supply and the common ground terminal according to the first pulse width modulation signal.

6. The heating wire power control circuit according to claim 4, characterized in that: The driving voltage output module includes a battery power supply and an energy storage element, and the boost output control module includes a third switch module and a fourth switch module. One end of the energy storage element is connected to the positive pole of the battery power supply, and the other end is connected to the third switch module and the fourth switch module. The third switch module is used to connect or disconnect the connection between the energy storage element and the common ground according to the second pulse width modulation signal, and the fourth switch module is used to connect or disconnect the connection between the energy storage element and the heating wire according to the second pulse width modulation signal.

7. The heating wire power control circuit according to claim 4, characterized in that: The driving voltage output module includes a battery power supply and an energy storage element, and the complementary output control module includes a first switch module, a second switch module, a third switch module and a fourth switch module. One end of the energy storage element is connected to the power battery through the first switch module, and the other end is connected to the heating wire through the fourth switch module. One end of the second switch module is connected to the end of the energy storage element connected to the first switch module, and the other end is connected to the common ground end. One end of the third switch module is connected to the end of the energy storage element connected to the fourth switch module, and the other end is connected to the common ground end.

8. An electronic cigarette, characterized in that The electronic cigarette comprises the heating wire power control circuit according to any one of claims 4 to 7.

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