WO2020181518A1 - Segmented heating temperature control system and electronic cigarette - Google Patents

Abstract

A segmented heating temperature control system and an electronic cigarette, wherein the system comprises: a power supply module (110), which is used to power the system; a multi-segmented heating element (120), which is used to separate multiple mutually independent heating areas, and enable one or more heating areas to simultaneously emit heat to locally heat the smokeable material in the electronic cigarette; and a plurality of temperature control circuits (130), each of which is used to independently monitor the heating temperature of one heating area; a path management module (140), which is used to control the multi-segmented heating element (120) to heat the local position of the smokeable material; and a central control module (150), which is used to send a control signal to the path management module (140) and each temperature control circuit (130) according to a preset segmented heating strategy, and control each temperature control circuit to continuously monitor the heating temperature of each heating area until each heating area reaches a target temperature.

Description

Sectional heating type temperature control system and electronic cigarette Technical field

The invention relates to the field of electronic technology, in particular to a segmented heating type temperature control system and an electronic cigarette.

Background technique

E-cigarettes are electronic products that imitate cigarettes and have the same appearance, smoke, taste and feel as cigarettes. Tobacco-type electronic cigarettes heat and bake tobacco at a constant temperature to evaporate smoke for users to smoke. The temperature control technology of electronic cigarettes largely determines the quality of electronic cigarettes.

technical problem

In the traditional electronic cigarette temperature control method, for the heating temperature control, whether it is in the form of sheet heating, rod heating, tubular heating, etc., it is an overall heating type temperature control technology regardless of area, but it uses an arealess temperature control technology. The overall heating type electronic cigarette temperature control technology makes the entire cartridge heated together. Although this type of technology achieves constant temperature heating and baking of the entire tobacco during the entire tobacco heating process, there is also a ratio of the amount of smoke in the early stage of the heating process. The amount of smoke in the later period is large, which makes the smoking taste worse in the later period, that is, the user's smoking taste is reduced due to the inaccurate temperature control; at the same time, the overall heating type electronic cigarette temperature control technology still has certain limitations in use, that is, it cannot be adapted Diversified cigarettes, such as long cigarettes, when heating the long cigarettes as a whole, because the entire tobacco is heated simultaneously, the heating temperature cannot be adjusted at any time according to the actual situation of the local position of the tobacco, that is, when the temperature is too high, it is easy to make the long cigarettes Scorched to produce burnt smell, and the amount of smoke is inconsistent.

That is to say, in the related technical solutions, the control of the heating temperature of the heated electronic cigarette has problems such as insufficient control accuracy and the uniformity of the amount of baking smoke.

Technical solutions

Based on this, in order to solve the problems of insufficient control accuracy and the baking uniformity of the smokeable material in the control of the heating temperature in the traditional electronic cigarette temperature control technology, a segmented heating temperature control system is proposed.

A segmented heating type temperature control system, including:

Power module, used to supply power to the system;

A multi-stage heating element is used to separate a plurality of independent heating areas, and make one or more of the heating areas emit heat at the same time to locally heat the smokable materials in the electronic cigarette;

A plurality of temperature control circuits, each of the temperature control circuits is electrically connected to each section of the multi-stage heating element, and each of the temperature control circuits is used to independently monitor the heating temperature of a heating zone;

The path management module is electrically connected to the power supply module and the temperature control circuit, and is used to control the multi-stage heating element to heat the local position of the suckable material;

The central control module is electrically connected to each of the temperature control circuits and the path management module, and is used to send control signals to the path management module and each of the temperature control circuits according to a preset segmented heating strategy to control each of the temperature control circuits. The temperature control circuit continuously monitors the heating temperature of each heating zone until each heating zone reaches the target temperature.

Optionally, in one of the embodiments, the path management module includes multiple groups of independent path control circuits, and the path control circuit includes a signal input terminal, a first switch unit, a first resistor, and a second resistor; The signal input terminal is grounded through the first resistor, while the signal input terminal, the second resistor, and the first switch unit are electrically connected in sequence; the power module is electrically connected to the first switch unit, and the central control module is connected to the signal through the second resistor. The input terminal is electrically connected, and the central control module controls the on-off of the first switch unit by sending a control signal to the signal input terminal.

Optionally, in one of the embodiments, the temperature control circuit includes a temperature detection module, and the temperature detection module is respectively connected in series with the first switch unit and the multi-stage heating element to form a temperature detection loop.

Optionally, in one of the embodiments, the temperature control circuit further includes a heating control module; the heating control module includes a second switch unit, and the central control module sends a pulse width modulation signal to the second switch unit , To control the heating zone to periodically heat the corresponding local position of the smokable material.

Optionally, in one of the embodiments, the central control module is configured to analyze the segmented heating strategy when the electronic cigarette activation signal is detected to determine the heating content of each heating zone, and the heating The content includes at least: no less than one heating zone to be heated and a heating control sequence for the no less than one heating zone, so as to complete the control operation of the segmented heating strategy.

Optionally, in one of the embodiments, the process for the central control module to determine not less than one heating zone to emit heat and the heating control sequence for the not less than one heating zone includes: the central control The module simultaneously or time-sharing controls multiple heating areas to be heated to continue heating within a certain heating interval.

Optionally, in one of the embodiments, the central control module determines not less than one heating zone to emit heat and the process of heating control sequence for the not less than one heating zone includes: After the heating zone corresponding to the position of the head end of the suction material is used as the first heating zone, the heating zone is controlled to continue heating during the preheating time interval.

Optionally, in one of the embodiments, the central control module is used to sequentially determine the heating area adjacent to the heated heating area as the next heating area to be heated and to control the heating area at a certain heating interval Continuous heating inside.

Optionally, in one of the embodiments, the central control module is also used to control each heated heating zone to always keep the heating temperature of the previous adjacent heated heating zone low in their corresponding heating interval. It is the heating temperature of the heating zone.

In addition, in order to solve the technical problems of insufficient control accuracy and uniformity of the amount of baking smoke in the control of the heating temperature in the traditional electronic cigarette temperature control technology, an electronic cigarette is also proposed.

An electronic cigarette includes the temperature control system described above, and the electronic cigarette uses the temperature control system to perform segmented heating control when performing temperature control.

Beneficial effect

Implementing the embodiments of the present invention will have the following beneficial effects:

After the above-mentioned segmented heating temperature control system and electronic cigarette are adopted, the path management module makes one or more temperature control circuits obtain power under the control of the central control module, so that the heating element emits heat to the smokable materials in the electronic cigarette Heating is performed in a whole or a local position; the central control module sends a control signal to the path management module and the temperature control circuit, and controls each of the temperature control circuits to adjust each local position of the heating element to be heated to a target temperature. Through the above system, the heating temperature of each local heating position of the electronic cigarette is accurately controlled through the segmented heating control, and the accuracy of the heating temperature control of the entire electronic cigarette is improved; and the heating temperature is independently controlled without interference, so that the smokable material is heated The heating element presents different temperature regions, which improves the uniformity of baking, and further improves the user's smoking taste when using the electronic cigarette device.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

among them:

Figure 1 is a structural block diagram of an electronic cigarette temperature control system in an embodiment;

2 is an equivalent circuit diagram of a heating element composed of local heating units with a common terminal in an embodiment;

Figure 3 is an equivalent circuit diagram of a heating element composed of local heating units without a common terminal in an embodiment;

4 is a schematic diagram of a circuit composed of a single path control circuit and a corresponding temperature control circuit in an embodiment;

5 is a structural block diagram of a single path control circuit and a corresponding temperature control circuit in an embodiment;

Figure 6 is a schematic diagram of a circuit composed of a path management module and various temperature control circuits in an embodiment;

Figure 7 is a resistance-temperature graph of a multi-stage heating element in an embodiment;

FIG. 8 is a flowchart corresponding to the segmented temperature control process of the electronic cigarette in an embodiment, that is, the segmented heating strategy.

Embodiments of the invention

In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present invention. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. It can be understood that the terms "first", "second", etc. used in the present invention can be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from another element. For example, without departing from the scope of the present application, the first element may be referred to as the second element, and similarly, the second element may be referred to as the first element. Both the first element and the second element are elements, but they are not the same element.

In order to solve the technical problems of insufficient control accuracy and the uniformity of the smokeable material baking in the traditional electronic cigarette temperature control technology for the control of the heating temperature, in this embodiment, a segmented heating temperature control system is proposed. , Used to realize the segmented heating control of electronic cigarettes. As shown in Figure 1, it is a structural block diagram of the temperature control system of the electronic cigarette. The temperature control system includes a power supply module 110, a central control module 150, a path management module 140, a temperature control circuit 130 and a multi-stage heating element 120. The power module 110, the path management module 140, the temperature control circuit 130, and the multi-stage heating element 120 are electrically connected in sequence, and the central control module 150 is electrically connected to the path management module 140 and the temperature control circuit 130, respectively.

The power module 110 is used to supply power to the system. In some specific embodiments, the power module 110 may be a battery, such as a lithium battery, a nickel-cadmium battery, and a nickel-hydrogen battery.

The multi-stage heating element 120 can divide the smokable material into a plurality of independent heating areas, and make one or more of the heating areas emit heat at the same time to locally heat the smokable material in the electronic cigarette Wherein, the smokable material can be equally divided into a plurality of regions to be heated, or divided into a plurality of regions to be heated with uneven sizes according to actual needs; in some specific embodiments, each of the heating regions The equivalent circuit of is shown in Figure 2 and Figure 3, where each of the heating zones shown in Figure 2 has a signal common output terminal; further, the central control module 150 can calculate the resistance of a certain heating zone according to Ohm’s law According to the corresponding relationship between the equivalent resistance of a certain heating zone and the temperature value, the temperature value corresponding to the heating zone is obtained. Among them, as shown in Figure 4, the resistor R6 is a sampling resistor, and the resistor RL is the equivalent resistance corresponding to the heating zone. The resistor R1 is connected in series with the resistor RL to form a series loop. The current in the loop is sampled by the resistor R6 according to Ohm's law. The resistance value of the resistance RL is calculated, and the temperature corresponding to the heating area can be obtained through the correspondence table of the resistance value and the temperature of the equivalent resistance corresponding to the heating area. Specifically, the central control module 150 reads the voltage values of the resistor R6 and the resistor RL after the transistor Q2 is turned on. At this time, the central control module 150 reads the voltage value of the port OUT1 as V1 and the voltage value of the port R_DET1 V2, the current flowing through resistor R6 is: i=(V2- V1)/R6.

Thus, the resistance value of the resistor RL is calculated: RL=V1/i=R6*V1/(V2-V1).

Among them, RL is the resistance value of a certain segment resistor RL, R6 is the resistance value of the sampling resistor, V1 is the voltage value of a certain heating zone, and V2 is the voltage value of the sampling resistor.

Further, according to the corresponding table of the resistance and temperature of the heating zone, the heating temperature indicated by the resistance of a certain segment resistor RL can be obtained. Figure 7 shows the resistance-temperature curve of the heating zone in one embodiment. In this embodiment, the temperature corresponding to the current resistance of the heating zone can be obtained according to the different resistances of the heating zone. For example, when it is detected When the resistance value of the heating zone is 0.77Ω, the current temperature of the heating zone is 25℃ according to the resistance-temperature curve of the heating zone; when the resistance value of the heating zone is detected to be 0.91Ω, according to the resistance value of the heating zone The resistance-temperature curve can get the current temperature of the heating zone as 100℃; when the resistance value of the heating zone is 1.86Ω, the current temperature of the heating zone can be obtained as 600 according to the resistance-temperature curve of the heating zone ℃.

The path management module 140 is respectively electrically connected to the power supply module 110 and the temperature control circuit 130, wherein the path management module can enable different local positions of the smokable material to be heated in time sharing or at the same time, the path management module 140 It includes multiple groups of independent path control circuits. As shown in FIG. 5, it is a structural block diagram of the path control circuit in an embodiment. The path control circuit includes a signal input terminal, a first switch unit, a first resistor, and a second resistor. The signal input terminal is grounded through the first resistor, while the signal input terminal, the second resistor and the first switch unit are electrically connected in sequence; the power module 110 is electrically connected with the first switch unit, and the central control module 150 passes through the The two resistors are electrically connected to the signal input terminal, and the central control module 150 controls the on-off of the first switch unit by sending a control signal to the signal input terminal. For example, when the central control module 150 sends a high voltage signal to the signal input terminal, the first switch unit is turned on, and then controls a certain heating area to obtain power; when the central control module 150 sends a low voltage signal to the signal input terminal, the first switch unit is turned off Open, the heating zone stops working.

In a specific embodiment, please continue to refer to Figure 4, the input terminal i_OUT_EN1 is used to control a certain temperature control circuit, which is grounded through the resistor R9, and the input terminal i_OUT_EN1 is also connected to the base of the transistor Q2 through the resistor R15, the transistor Q2 The collector of the transistor Q2 is connected to the power supply terminal BAT+, the emitter of the transistor Q2 is connected to one end of the sampling resistor R6, the port R_DET1 is drawn between the sampling resistor R6 and the emitter of the transistor Q2, and the other end of the sampling resistor R6 is connected to the output terminal of the temperature control circuit OUT1. Among them, the transistor Q2 is an NPN transistor. When the base of the transistor Q2 receives a high voltage, the transistor Q2 is turned on, and when the base of the transistor Q2 receives a low voltage, the transistor Q2 is turned off; it is understandable that the other In the embodiment, the first switch unit may also be a PNP transistor, a PMOS tube, an NMOS tube, a low-dropout linear regulator, a switching power supply, etc. By controlling the on-off of the path control circuit to adjust the working status of each heating zone, segmented heating can be realized. For example, the entire smokable material can be heated at the same time, and multiple local locations can be heated at the same time. Each local location is heated one by one, etc.

A plurality of temperature control circuits 130, each temperature control circuit 130 independently controls a heating area under the control of the central control module 150 to heat the local position of the smokable material and can adjust the heating temperature in real time according to the actual situation, that is, each temperature control The circuits work independently, do not affect each other, and can work in time sharing or at the same time, specifically controlled by the central control module 150. Wherein, at the same time, each of the temperature control circuits 130 is time-sharing under the control of the central control module 150 or simultaneously causes multiple heating zones to adjust their respective heating temperatures. In one of the embodiments, the temperature control circuit includes at least a temperature detection module and a heating control module; the temperature detection module is respectively connected in series with the first switch unit and the multi-stage heating element to form a temperature detection loop. The central control module 150 can send a control signal to the signal input terminal of the path control circuit to control the on-off of the first switch unit. For example, when the central control module 150 sends a high voltage signal to the signal input terminal, the first switch unit is turned on. Then the temperature detection module starts temperature detection; when the central control module 150 sends a low voltage signal to the signal input terminal, the first switch unit is turned off, and the temperature detection module stops temperature detection. The sampling resistor is used to sample the current in the loop and is used as a reference for measuring the resistance of the heating zone in the circuit. The resistance of the sampling resistor in this embodiment is smaller than the resistance of the heating zone. In other embodiments, it can also be set to The voltage in the loop is sampled through the sampling resistor. When the voltage is sampled through the sampling resistor, the resistance of the sampling resistor can be set to be greater than the resistance of the heating zone. The heating control module includes a second switch unit, and the central control module 150 can send PWM (Pulse Width) to the second switch unit. Modulation, pulse width modulation) signal to control the periodic heating of the local heating unit. Specifically, by setting the duty cycle of the PWM signal, the conduction period of the second switching unit can be set. When the second switching unit is turned on, the power output from the power supply module flows to the multi-stage heating element through the second switching unit , So that the heating zone obtains power and emits heat, that is, the heating zone is heated when the second switch unit is turned on. When the second switch unit is turned off, the heating zone stops heating. It should be noted that in this embodiment, different duty ratios of the PWM signals control different heating durations, that is, the central control module adjusts the duty ratio of the PWM signals to achieve temperature adjustment of the heating zone.

In a specific embodiment, as shown in FIG. 4, a schematic circuit diagram of the heating control module in an embodiment is included. The heating control module includes a PMOS tube U4, pins 1, 2, 3 of the PMOS tube U4, and a power module Connect, the pin 4 of the PMOS tube U4 is connected with the central control module, and the pins 5, 6, 7, 8 of the PMOS tube U4 are connected with the heating element. The PWM signal sent by the central control module is sent to the PMOS transistor U4 through pin 4 to control the on and off of the PMOS transistor U4. Optionally, when the port PWM1_OUT is at a low voltage, the PMOS transistor U4 is turned on to control the heating area; when the port PWM1_OUT is at a high voltage, the PMOS transistor U4 is turned off, that is, the temperature control circuit is controlled by the port i_OUT_EN; the port PWM_OUT is controlled The power supply path and heat the hot zone. In other embodiments, the second switch unit may also be an NMOS transistor, an NPN transistor, a PNP transistor, a low-dropout linear regulator, a switching power supply, etc., which is not limited in this embodiment.

In a specific embodiment, as shown in FIG. 6, the multiple groups of independent path control circuits in the path management module 140 are electrically connected to the temperature control circuit and the heating zone at one end, and the other end is grounded.

The central control module 150 detects the current temperature of the controlled heating zone through a certain temperature control circuit 130 and adjusts the local position of the smokeable material corresponding to the heated heating zone to the target temperature. Further, the central control module 150 controls the temperature detection module to work in the first cycle, and the heating control module to work in the second cycle, and the first cycle is smaller than the second cycle.

The central control module 150 is used to send control signals to the path management module 140 and each of the temperature control circuits 130 according to a preset segmented heating strategy, and control each of the temperature control circuits to continuously monitor the heating temperature of each heating zone to Each heating zone reaches the target temperature. Specifically, the central control module 150 is configured to analyze the segmented heating strategy when the electronic cigarette activation signal is detected to determine the heating content of each heating zone, and the heating content includes at least: One heating zone to be heated and the heating control sequence for the no less than one heating zone to complete the control operation of the segmented heating strategy. For example, the central control module 150 can control multiple heating zones at the same time or in time. The heating zone is heated continuously within a certain heating interval.

In one embodiment, the process of determining not less than one heating zone to emit heat by the central control module and the heating control sequence for the not less than one heating zone includes: After the heating zone corresponding to the head end position is used as the first heating zone, the heating zone is controlled to continue heating within the preheating time interval; secondly, the heating zone adjacent to the heated heating zone is determined as the next heating zone to be heated The heating zone and control the heating zone to continue heating within a certain heating interval; at the same time, the central control module can also control each heated heating zone to always maintain the previous adjacent heated heating within the corresponding heating interval The heating temperature of the zone is lower than the heating temperature of the heating zone.

In a specific embodiment, as shown in FIG. 8 for the segmented heating strategy control process corresponding to the segmented temperature control of the electronic cigarette, each local position of the smokable material in the electronic cigarette corresponds to the n of the multi-segment heating element one by one. Two independent heating zones, when the central control module detects the electronic cigarette start signal, the heating zone corresponding to the first end of the smokable material is taken as the first heating zone, and the heating zone is controlled to preheat Continuous high temperature heating in the time interval t1; the central control module controls the heating zone adjacent to the first heating zone to be the second heating zone within a certain heating interval t2 and makes it heat within the heating interval The temperature is higher than the heating temperature of the first heating zone, that is, the second heating zone keeps heating at high temperature, while the first heating zone keeps heating at low temperature; the central control module controls the heating interval t3 of the second heating zone. The heating zone adjacent to the second heating zone is the third heating zone and the heating temperature in this heating interval is higher than the heating temperature of the second heating zone, that is, the third heating zone keeps high temperature heating, and the The two heating zones are kept heated at low temperature; and according to the control law, the heating zone adjacent to the heated heating zone is determined as the next heating zone to be heated, and the heating zone is controlled to always maintain within its corresponding heating interval The heating temperature of the previous heated heating zone is lower than the heating temperature of the heating zone adjacent to the heating zone; until the electronic cigarette is turned off; in addition, the high temperature/low temperature heating can be set according to user preferences under normal circumstances, such as This makes the combustion temperature of the electronic cigarette reach 200~350℃ at high temperature, while the combustion temperature of the electronic cigarette is lower than 100℃ at low temperature. At the same time, each temperature control circuit can independently detect the current heating temperature of the corresponding heating zone under the control of the central control module and adjust the heating temperature of the heating zone to the target temperature through the heating control module.

In a specific embodiment, as shown in FIG. 7 for the segmented heating strategy control process corresponding to the segmented temperature control of the electronic cigarette, each local position of the smokable material in the electronic cigarette corresponds to the n of the multi-segment heating element one by one. Two independent heating zones, when the central control module detects the electronic cigarette start signal, the heating zone corresponding to the first end of the smokable material is taken as the first heating zone, and the heating zone is controlled to preheat Continuous high-temperature heating within a time interval; the central control module controls the heating zone adjacent to the first heating zone to be the second heating zone within a certain heating interval and keeps the second heating zone heated at high temperature, and The first heating zone maintains low temperature heating; the central control module controls the heating zone adjacent to the second heating zone to be the third heating zone within the second heating interval and keeps the third heating zone High temperature heating, while the second heating zone keeps heating at a low temperature, while the first heating zone also keeps heating at a low temperature or stops heating. At this time, the low temperature heating can be the same as or lower than the temperature of the second heating zone. The temperature; and according to the control law, the heating area adjacent to the heated heating area is determined as the next heating area to be heated and the heating area is controlled to always maintain its neighboring previous one in its corresponding heating interval The heating temperature of the heated heating zone is lower than the heating temperature of the heating zone, while keeping other heated heating zones at the same low temperature (at this time, the temperature can be the same as that of the heating zone adjacent to the heating zone. The temperature remains the same or lower than the heating temperature) or stops heating, which is set by the customer; until the electronic cigarette is turned off. At the same time, each temperature control circuit can independently detect the current heating temperature of the corresponding heating zone under the control of the central control module and adjust the heating temperature of the heating zone to the target temperature through the heating control module.

In one embodiment, the central control module sends a PWM signal to the second switch unit to control the periodic heating of the local heating unit. Specifically, the central control module obtains the current duty cycle value, and calculates the target duty cycle adjustment value of the pulse width modulation signal according to the detected difference between the current temperature value of the local heating unit and the target temperature value.

A more detailed description is made as follows. The specific process of adjusting the duty cycle of the PWM signal can be determined according to the current duty cycle and the specific magnitude and sub-conditions of the current temperature value.

In a specific embodiment, in a case where the current temperature value is greater than the target temperature value and the first difference value exceeds a preset difference value threshold, the current output duty of the PWM output terminal is acquired The ratio is the buffer duty cycle value; the target duty cycle adjustment value is set to 0. That is to say, when the current duty cycle value D _N-1 ≠ 0, and the current temperature value T _N-1 > T _t + T _E (where T _t is the target temperature value, T _E is the preset difference Value threshold), set the target duty cycle adjustment value to 0, that is, clear the PWM output to 0 to reduce the temperature of the heating resistor.

After the duty cycle is 0 or the duty cycle is set to 0, in the process of determining the target duty cycle adjustment value according to the current duty cycle value, the current temperature value, and the preset target temperature value, The specific process of adjusting the PWM duty cycle is as follows: when the current duty cycle value is 0 and the obtained current temperature value is less than or equal to the target temperature value, the target duty cycle is adjusted The value is set to the buffer duty cycle value.

In other words, before clearing the PWM duty cycle to zero, the specific size of the current PWM duty cycle needs to be stored, so that when the specific value of the PWM duty cycle is set later, it can be determined that it is closer to the target temperature value. The PWM duty cycle improves the user experience. Therefore, when the duty cycle is 0, if the detected current temperature value is greater than or equal to the target temperature value, the PWM duty cycle is maintained at 0; if the detected current temperature value is less than or equal to the target temperature value , The PWM duty cycle needs to be adjusted. Therefore, the target duty cycle adjustment value is set to the buffered duty cycle value, which is the value of the stored duty cycle before the PWM duty cycle was cleared last time .

That is, when the current duty cycle value D _N-1 =0 and the current temperature value T _N-1 < T _t (where T _t is the target temperature value), the target duty cycle adjustment value D _{N is} set It is the buffered duty cycle value D ´ , that is, the PWM duty cycle is adjusted to the size corresponding to the buffered duty cycle value D ´ , so as to control the heating temperature of the electronic cigarette to be around the best target temperature.

In another optional embodiment, when the current temperature value is less than or equal to the target temperature value and the duty cycle is not 0, the central control module calculates the temperature difference between the target temperature value and the current temperature value The value is used as the first difference value, and the first difference value quantized value corresponding to the first difference value is obtained according to the preset correspondence relationship between the difference value and the quantized value, and the first difference value quantized value is between 0 and 1. And obtain the difference quantized value calculated last time as the second difference quantized value; the central control module according to the current duty cycle value and the first difference quantized value, the second difference The value quantization value determines the target duty cycle adjustment value.

Wherein, determining the target duty cycle adjustment value according to the current duty cycle value, the first difference quantized value, and the second difference quantized value is specifically:

According to the formula: D _N =D _N-1 +2E _N -E _N-1

Calculating a target duty adjustment value, wherein, D _N is the duty adjustment target value, D _N-1 to the current duty value, E _N quantization values for the first difference, E _N-1 is a second difference Value quantized value.

In other words, when the current duty cycle value is not 0, and the current temperature value is less than the target temperature value or does not exceed a certain range of the target temperature (for example, less than 5 °C greater than the target temperature value), the PWM The empty ratio is adjusted, but the adjustment range is the current duty cycle value plus twice the difference quantization value, and subtract the last difference quantization value. Among them, the difference quantized value is a quantized value between 0 and 1 based on the difference between the detected current temperature value and the target temperature value. For example, when the difference is 5°C, the The difference quantization value is set to 2%.

It should be noted that, in this embodiment, the first difference quantized value represents the difference between the detected current temperature value and the target temperature value in this adjustment (that is, the Nth adjustment) Difference quantization value; the second difference quantization value E _N-1 represents the difference between the current temperature value detected and the target temperature value in this adjustment (that is, the N-1th adjustment or the last adjustment) The difference quantized value corresponding to the value.

As mentioned earlier, the target duty cycle adjustment value can be determined according to the following formula:

.

In other words, when the current PWM duty cycle is not 0 and the current temperature of the heating resistor does not exceed a certain range of the target temperature, the adjustment range of the PWM duty cycle is added to the original PWM duty cycle. The quantized value of the temperature difference detected in this adjustment is twice the quantized value of the temperature difference detected in the last adjustment process, which is PID (proportion-integral-derivative, proportional, integral, Differential control) adjustment. When the temperature of the heating resistor exceeds a certain range of the target temperature, the PWM duty cycle is set to 0; and when the current PWM duty cycle is not 0, the specific value of the PWM duty cycle is obtained as the buffer value . After the PWM duty cycle is cleared, when the temperature of the heating resistor drops to the target temperature, the PWM duty cycle before the price is cleared is restored, and PID adjustment is restarted.

In a specific embodiment, the difference value between the current temperature value and the target temperature value, and the corresponding relationship between the quantized value of the difference value, for example, can be a linear function or a non-linear function, or a step function.

In a specific embodiment, in order to avoid the burden of frequent PWM duty cycle adjustments caused by subtle temperature differences on the electronic cigarette processor, the difference between the current temperature value and the target temperature value The corresponding relationship between, and the difference quantized value can adopt a step function. For example, use the following function definition:

Among them, E is the quantified value of the difference, which is the difference between the target temperature value and the current temperature value, namely: Δ T = T _t - T _N.

In other embodiments, the difference between the current temperature value and the target temperature value and the corresponding relationship between the quantized value of the difference may adopt any positive correlation function.

Based on the same inventive concept, the present invention also provides an electronic cigarette, including the temperature control system in the above-mentioned embodiments, and the electronic cigarette uses the temperature control system to perform segmented heating control during temperature control. Optionally, the e-cigarette may be an e-cigarette rod of a heating type e-cigarette, which can contain smokable materials such as shredded tobacco, and can heat the smokable materials for users to smoke.

In the above-mentioned segmented heating temperature control system and electronic cigarette, the path management module enables one or more temperature control circuits to obtain power so that the heating element emits heat to heat the entire or local position of the smokable material in the electronic cigarette; The module sends control signals to the path management module and the temperature control circuit, and controls each of the temperature control circuits to adjust each local position of the heating element to be heated to a target temperature. Through the above system, the heating temperature of each local heating position of the electronic cigarette is accurately controlled through the segmented heating control, and the accuracy of the heating temperature control of the entire electronic cigarette is improved; and the heating temperature is independently controlled without interference, so that the smokable material is heated The heating element presents different temperature zones, which improves the uniformity of the baking and ensures the uniformity of the amount of smoke before and after the baking, thereby improving the user’s smoking taste in the electronic cigarette device; in addition, the above temperature control system can It is directly used in the heating control technology of long cigarettes, which solves the problem of adaptability of the similar cartridge.

The above-mentioned embodiments only express several implementation manners of this application, and their descriptions are more specific and detailed, but they should not be construed as limiting the scope of this application. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of this application, several modifications and improvements can be made, and these all fall within the protection scope of this application. Therefore, the scope of protection of the patent of this application shall be subject to the appended claims.

Claims (10)

1. A segmented heating type temperature control system is characterized in that it comprises:

   Power module, used to supply power to the system;

   A multi-stage heating element is used to separate a plurality of independent heating areas, and make one or more of the heating areas emit heat at the same time to locally heat the smokable materials in the electronic cigarette;

   A plurality of temperature control circuits, each of the temperature control circuits is electrically connected to each section of the multi-stage heating element, and each of the temperature control circuits is used to independently monitor the heating temperature of a heating zone;

   The path management module is electrically connected to the power supply module and the temperature control circuit, and is used to control the multi-stage heating element to heat the local position of the suckable material;

   The central control module is electrically connected to each of the temperature control circuits and the path management module, and is used to send control signals to the path management module and each of the temperature control circuits according to a preset segmented heating strategy to control each of the temperature control circuits. The temperature control circuit continuously monitors the heating temperature of each heating zone until each heating zone reaches the target temperature.
2. The system according to claim 1, wherein the path management module includes multiple groups of independent path control circuits, and the path control circuit includes a signal input terminal, a first switch unit, a first resistor, and a second resistor The signal input terminal is grounded through the first resistor, while the signal input terminal, the second resistor and the first switch unit are electrically connected in sequence; the power module is electrically connected with the first switch unit, and the central control module is electrically connected through the second resistor It is electrically connected to the signal input terminal, and the central control module controls the on-off of the first switch unit by sending a control signal to the signal input terminal.
3. The system according to claim 2, wherein the temperature control circuit comprises a temperature detection module, and the temperature detection module is respectively connected in series with the first switch unit and the multi-stage heating element to form a temperature detection loop .
4. The system according to claim 3, wherein the temperature control circuit further comprises a heating control module; the heating control module comprises a second switch unit, and the central control module sends a pulse width to the second switch unit The signal is modulated to control the heating zone to periodically heat the corresponding local position of the smokable material.
5. The system according to claim 2, wherein the central control module is used to analyze the segmented heating strategy when the electronic cigarette activation signal is detected to determine the heating content of each heating zone. The heating content includes at least: no less than one heating zone to be heated and a heating control sequence for the no less than one heating zone, so as to complete the control operation of the segmented heating strategy.
6. The system according to claim 5, wherein the process of determining not less than one heating zone to emit heat by the central control module and the heating control sequence for the not less than one heating zone includes: The central control module is used to simultaneously or time-sharing control multiple heating areas to be heated to continue heating within a certain heating interval.
7. The system according to claim 5, characterized in that the process of the central control module determining not less than one heating zone to emit heat and the heating control sequence for the not less than one heating zone includes: After the heating zone corresponding to the position of the first end of the suckable material is used as the first heating zone, the heating zone is controlled to continue heating during the preheating time interval.
8. The system according to claim 7, wherein the central control module is used to sequentially determine the heating zone adjacent to the heated heating zone as the next heating zone to be heated and control the heating zone at a certain Continuous heating during the heating interval.
9. The system according to claim 8, wherein the central control module is also used to control each heated heating zone to always maintain the heating of the previous adjacent heated heating zone within the corresponding heating interval. The temperature is lower than the heating temperature of the heating zone.
10. An electronic cigarette, characterized by comprising the temperature control system according to claims 1-9, the electronic cigarette adopts the temperature control system to perform segmented heating control when performing temperature control.