CN112214053B - Automatic temperature control circuit and method for cigarette heating device - Google Patents
Automatic temperature control circuit and method for cigarette heating device Download PDFInfo
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- CN112214053B CN112214053B CN202011032781.4A CN202011032781A CN112214053B CN 112214053 B CN112214053 B CN 112214053B CN 202011032781 A CN202011032781 A CN 202011032781A CN 112214053 B CN112214053 B CN 112214053B
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- G05D23/19—Control of temperature characterised by the use of electric means
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Abstract
The invention relates to an automatic temperature control circuit and a method for a cigarette heating device, wherein the cigarette heating device comprises a heating element, and the automatic temperature control circuit comprises: the control module is used for controlling the voltage output to the heating element and issuing a switching control instruction to the switching module according to the temperature information of the heating element; and the switching module is used for switching the preheating mode and the constant temperature mode of the heating element according to a switching control instruction given by the control module. According to the automatic temperature control circuit and the method, the working voltage of the heating element in the preheating mode is increased, so that the heating element in the cigarette heating device can quickly reach the target temperature, the smoking waiting time of a user is shortened, the preheating time in the early stage of smoking is reduced, the circuit design is simple, and the cost is saved.
Description
Technical Field
The invention relates to the technical field of electronic cigarettes, in particular to an automatic temperature control circuit and method for a cigarette heating device.
Background
With the growing severity of the global smoking control environment and the growing concern of consumers on health, tobacco products are being developed towards diversification and smokelessness. The heating cigarette is a novel tobacco product which utilizes a heat source to heat a smoking substrate without burning, and is characterized in that the release amount of harmful ingredients is low, the smoking experience similar to that of tobacco ignition is provided for a consumer, heating auxiliary smoking needs to be carried out by means of a heating device, and therefore the heating device is an important component of the heating cigarette.
The temperature control technology is the core of the cigarette heating device, at present, the constant control technology of the heating temperature is mature industrially, but the device for heating the non-burning cigarettes has the characteristics of miniaturization and precise structure, and is difficult to realize by using a common industrial heating control method. In the existing electronic cigarette temperature control technology, the problems of long preheating time in the early stage of smoking and complex circuit design exist.
Disclosure of Invention
The invention aims to solve the problems of long preheating time in the early stage of smoking and complicated circuit design in the existing electronic cigarette temperature control technology, and provides an automatic temperature control circuit and method for a cigarette heating device.
In order to solve the first technical problem provided by the invention, namely the problem of long preheating time in the early stage of smoking, the invention provides the following technical scheme:
an automatic temperature control circuit of a cigarette heating device, the cigarette heating device comprising a heating element, comprising:
the control module is used for controlling the voltage output to the heating element and issuing a switching control instruction to the switching module according to the temperature information of the heating element;
and the switching module is used for switching the preheating mode and the constant temperature mode of the heating element according to a switching control instruction given by the control module.
In the scheme, firstly, the control module controls the power supply module to output a first voltage to the heating element, so that the heating element enters a preheating mode, when the working temperature value of the heating element is greater than a preset temperature threshold value, the control module controls the switching module to switch the preheating mode into a constant temperature mode, the power supply module outputs a second voltage to the heating element, so that the heating element is switched from the preheating mode into the constant temperature mode, and the first voltage is greater than the second voltage. The working voltage of the cigarette heating device in the preheating mode is increased, so that the temperature of the heating element in the cigarette heating device rapidly reaches the temperature threshold, and the smoking waiting time of a user is shortened.
Furthermore, in order to better solve the problem of monitoring the working temperature of the heating element, the automatic temperature control circuit further comprises a temperature measurement module and a comparison module;
the temperature measuring module is used for detecting the working temperature value of the heating element in real time and feeding the detected working temperature value back to the control module for recording;
the comparison module is used for acquiring the working temperature value of the heating element detected by the temperature measurement module, and comparing the working temperature value with a preset temperature threshold value, so as to send a switching strategy to the control module;
the switching strategy comprises the following steps:
when the working temperature value of the heating element is smaller than a preset temperature threshold value, a strategy for keeping the heating element in a preheating mode is sent to the control module;
and when the working temperature value of the heating element is greater than the preset temperature threshold value, sending a strategy for switching the preheating mode of the heating element into the constant temperature mode to the control module.
Furthermore, for better realizing that the working temperature of the heating element in the preheating mode is higher than that in the constant temperature mode, the switching module is connected with the driving module, and when the switching module receives a switching control instruction for switching the heating element from the preheating mode to the constant temperature mode, which is issued by the control module, the driving module outputs the corresponding PWM square wave in the constant temperature mode to the switching module.
When the heating element is in a preheating mode, the driving module does not work, and the heating element directly receives a first voltage output by the power supply module, namely a direct-current voltage; when the heating element is in the constant temperature mode, the driving module outputs the PWM square wave, the power supply module outputs a second voltage according to the waveform of the PWM square wave, and the second voltage output by synthesizing the waveform of the PWM square wave is smaller than the first voltage due to the fact that the PWM square wave has high voltage and low voltage.
In order to solve the second technical problem proposed by the present invention, i.e. the problem of complicated circuit design, the present invention provides the following technical solutions:
the switching module comprises a resistor R3, a resistor R4, a triode Q1, a freewheeling diode D2, a relay K1, a relay K2 and a triode Q2, an I/O output end of the control module is connected with one end of the resistor R3, the other end of the resistor R3 is connected with a base of a triode Q1 and one end of the resistor R4 respectively, an emitter of the triode Q1 and the other end of the resistor R4 are grounded, a collector of the triode Q1 is connected with an anode of the freewheeling diode D2, the freewheeling diode D2, the relay K1 and the relay K2 are connected in parallel, the other end of the relay K1 is connected with a base and a collector of a triode Q2 respectively, and the other end of the relay K2 is connected with a base of a triode Q2 and the driving module respectively.
The driving module comprises a resistor R1, a resistor R2, a capacitor C1, a capacitor C2 and an NE555 timer, wherein a DIS pin of the NE555 timer is respectively connected with one end of a resistor R1 and one end of a resistor R2, the other end of a resistor R2 is respectively connected with one end of a capacitor C1, a THR pin and a TRI pin of the NE555 timer, a CON pin of the NE555 timer is connected with one end of a capacitor C2, the other end of the capacitor C1, the other end of the capacitor C2 and a GND pin of the NE555 timer are all grounded, and an OUT pin of the NE555 timer is respectively connected with the other end of the relay K2 and a base of the triode Q2.
In the scheme, the number of used circuit components is small, the circuit principle is simple, and the purpose of the invention can be achieved by simply connecting common components.
The power supply module is used for outputting a first voltage or a second voltage to the heating element according to the control of the control module.
Based on the automatic temperature control method, the invention also provides an automatic temperature control method of the cigarette heating device, which comprises the following steps:
starting the cigarette heating device, and controlling the power supply module to output a first voltage to the heating element by the control module so that the heating element enters a preheating mode;
the temperature measurement module detects the working temperature value of the heating element in real time, and judges the working temperature value and the temperature threshold value, so that a switching strategy is sent, and the heating element is switched from a preheating mode to a constant temperature mode.
Furthermore, the step of starting the cigarette heating device and controlling the power module to output the first voltage to the heating element by the control module so that the heating element enters the preheating mode includes:
closing the switch S1A, starting the cigarette heating device, the I/O output end of the control module outputs low level to the switching module, a triode Q1 and a freewheeling diode D2 in the switching module are cut off, a normally open contact of a relay K1 is closed, a normally closed contact of the relay K2 is opened, the driving module does not work, a power supply module outputs first voltage to a triode Q2 through a closed switch S1A, the triode Q2 is switched on, and the heating element enters a preheating mode.
Furthermore, the temperature measuring module detects the working temperature value of the heating element in real time, and determines the size of the working temperature value and the temperature threshold value, so as to send a switching strategy, and the step of switching the heating element from the preheating mode to the constant temperature mode includes:
after the heating element enters a preheating mode, the temperature measuring module detects the temperature of the surface of the heating element in real time to obtain the working temperature value of the heating element, and the working temperature value is fed back to the control module to be recorded;
the comparison module acquires the working temperature value of the heating element detected by the temperature measurement module, and judges the working temperature value of the heating element and the preset temperature threshold value, so that a switching strategy is sent to the control module; the switching strategy comprises the following steps:
when the working temperature value of the heating element is smaller than a preset temperature threshold value, the comparison module sends a strategy for keeping the heating element in a preheating mode to the control module;
when the working temperature value of the heating element is larger than the preset temperature threshold value, the comparison module sends a strategy for switching the preheating mode of the heating element into the constant temperature mode to the control module, so that the heating element is switched from the preheating mode into the constant temperature mode.
Furthermore, after the step of sending the strategy of switching the heating element from the preheating mode to the constant temperature mode to the control module by the comparison module when the operating temperature value of the heating element is greater than the preset temperature threshold, the method further includes the steps of:
an I/O output end of the control module outputs high level to the switching module, a triode Q1 and a freewheeling diode D2 in the switching module are switched on, a normally closed contact of a relay K1 is disconnected, a normally open contact of a relay K2 is closed, an NE555 timer in the driving module outputs corresponding PWM square waves in a constant temperature mode to the triode Q2 according to resistance values of a resistor R1 and a resistor R2, capacitance values of a capacitor C1 and a capacitor C2, and the power supply module outputs second voltage to the heating element according to the PWM square waves, so that the heating element is switched from the preheating mode to the constant temperature mode.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the automatic temperature control circuit provided by the invention, the working voltage of the heating element in the preheating mode is increased, so that the heating element in the cigarette heating device can quickly reach the target temperature, the smoking waiting time of a user is shortened, and the preheating time in the early stage of smoking is reduced.
(2) The invention uses a small number of circuit components, has simple circuit principle, and can finish the aim of the invention by simply connecting common components.
(3) When the heating element is in a constant temperature mode, the temperature of the heating element is regulated and controlled according to the resistance characteristic of the heating element, the control precision is higher, the control process is stable and simple, and the cost is saved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a block diagram of an automatic temperature control device according to embodiment 1 of the present invention;
fig. 2 is a schematic circuit diagram of a switching module and a driving module according to embodiment 1 of the present invention;
fig. 3 is a flowchart of an automatic temperature control method according to embodiment 1 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Also, in the description of the present invention, the terms "first", "second", and the like are used for distinguishing between descriptions and not necessarily for describing a relative importance or implying any actual relationship or order between such entities or operations.
Example 1:
the embodiment describes a control process of a smoking period of an electronic cigarette, and as shown in fig. 1, provides an automatic temperature control circuit of a cigarette heating device, wherein the cigarette heating device comprises a heating element, and the automatic temperature control circuit comprises a control module, a switching module, a temperature measuring module, a comparison module, a driving module and a power supply module.
The cigarette heating device is started firstly, the switch S1A is closed, and the control module controls the power supply module to output a first voltage to the heating element through the switching module, so that the heating element enters a preheating mode. After the heating element enters the preheating mode, the temperature measuring module detects the temperature of the surface of the heating element in real time to obtain the working temperature value of the heating element, and the temperature measuring module can feed back the working temperature value of the heating element detected in real time to the control module for recording. The comparison module obtains the working temperature value of the heating element detected by the temperature measurement module, compares the working temperature value with a preset temperature threshold value, and sends a strategy for switching the preheating mode of the heating element into the constant temperature mode to the control module when the working temperature value is greater than the temperature threshold value. At the moment, the control module issues a switching control instruction to the switching module, the switching module sends a signal to the driving module, so that the driving module outputs a PWM square wave corresponding to the heating element in the constant temperature mode to the switching module, and the control module controls the power supply module to output a second voltage to the heating element through the switching module according to the PWM square wave, so that the heating element is switched from the preheating mode to the constant temperature mode.
More specifically, as shown in fig. 2, the switching module includes a resistor R3, a resistor R4, a transistor Q1, a freewheeling diode D2, a relay K1, a relay K2, and a transistor Q2, an I/O output terminal of the control module is connected to one end of the resistor R3, the other end of the resistor R3 is connected to a base of the transistor Q1 and one end of the resistor R4, an emitter of the transistor Q1 and the other end of the resistor R4 are both grounded, a collector of the transistor Q1 is connected to an anode of the freewheeling diode D2, the freewheeling diode D2, the relay K1, and the relay K2 are connected in parallel, the other end of the relay K1 is connected to a base and a collector of the transistor Q2, and the other end of the relay K2 is connected to a base of the transistor Q2 and the driving module.
The driving module comprises a resistor R1, a resistor R2, a capacitor C1, a capacitor C2 and an NE555 timer, wherein a DIS pin of the NE555 timer is respectively connected with one end of a resistor R1 and one end of a resistor R2, the other end of a resistor R2 is respectively connected with one end of a capacitor C1, a THR pin and a TRI pin of the NE555 timer, a CON pin of the NE555 timer is connected with one end of a capacitor C2, the other end of the capacitor C1, the other end of the capacitor C2 and a GND pin of the NE555 timer are all grounded, and an OUT pin of the NE555 timer is respectively connected with the other end of the relay K2 and a base of the triode Q2.
The working principle of the switching module and the driving module is as follows:
when the control module controls the power module to output the first voltage to the heating element, the I/O output end of the control module outputs a low level to the switching module, a triode Q1 in the switching module is cut off, a freewheeling diode D2 is cut off, a normally open contact of a relay K1 is closed, a normally closed contact of the relay K2 is disconnected, a driving module connected with the switching module does not work, the power module outputs the first voltage to a triode Q2 through a closed switch S1A, a triode Q2 is conducted, the heating element receives the first voltage, and the heating element enters a preheating mode to be rapidly heated.
When the working temperature value of the heating element reaches the temperature threshold value, the I/O output end of the control module outputs high level to the switching module, a triode Q1 in the switching module is conducted, a freewheeling diode D2 is conducted, a normally closed contact of a relay K1 is disconnected, a normally open contact of the relay K2 is closed, a driving module connected with the switching module starts to work, an NE555 timer in the driving module outputs PWM square waves with corresponding duty ratios to the triode Q2 according to the resistance values of a resistor R1 and a resistor R2, the capacitance values of a capacitor C1 and a capacitor C2, and the power supply module outputs second voltage to the heating element through a triode Q2 according to the waveform of the PWM square waves, so that the heating element is switched from a preheating mode to a constant temperature mode.
It should be noted that the first voltage is a voltage directly output by the power module, that is, a direct current voltage; the second voltage is the voltage output by the power module according to the PWM square wave waveform, namely the alternating current voltage. Because the waveform of the PWM square wave has high voltage and low voltage, the second voltage output by the power module is smaller than the first voltage output by the power module.
Based on the circuit, the invention also provides an automatic temperature control method of the cigarette heating device, which comprises the following steps as shown in fig. 3:
step S1: the cigarette heating device is started, and the control module controls the power supply module to output a first voltage to the heating element, so that the heating element enters a preheating mode.
The switch S1A is closed, the cigarette heating device is started, the I/O output end of the control module outputs low level to the switching module, a triode Q1 and a freewheeling diode D2 in the switching module are cut off, a normally open contact of a relay K1 is closed, a normally closed contact of the relay K2 is disconnected, the driving module does not work, a power supply module outputs a first voltage of 2.0V-4.3V to a triode Q2 through a closed switch S1A, the triode Q2 is connected, and the heating element enters a preheating mode to rapidly heat up.
Step S2: the temperature measurement module detects the working temperature value of the heating element in real time, and judges the working temperature value and the temperature threshold value, so that a switching strategy is sent, and the heating element is switched from a preheating mode to a constant temperature mode.
After the heating element enters a preheating mode, the temperature measuring module detects the temperature of the surface of the heating element in real time to obtain the working temperature value of the heating element, and the working temperature value is fed back to the control module to be recorded; the comparison module obtains the working temperature value of the heating element detected by the temperature measurement module, and judges the working temperature value of the heating element and the preset temperature threshold value, so that a switching strategy is sent to the control module.
The switching strategy comprises the following steps:
when the working temperature value of the heating element is smaller than a preset temperature threshold value, the comparison module sends a strategy for keeping the heating element in a preheating mode to the control module; when the working temperature value of the heating element is larger than the preset temperature threshold value, the comparison module sends a strategy for switching the preheating mode of the heating element into the constant temperature mode to the control module, so that the heating element is switched from the preheating mode into the constant temperature mode.
When the working temperature value of the heating element is greater than the preset temperature threshold value, the I/O output end of the control module outputs a high level to the switching module, a triode Q1 and a freewheeling diode D2 in the switching module are switched on, a normally closed contact of a relay K1 is disconnected, a normally open contact of the relay K2 is closed, an NE555 timer in the driving module outputs a corresponding PWM square wave in a constant temperature mode to the triode Q2 according to the resistance values of a resistor R1 and a resistor R2 and the capacitance values of a capacitor C1 and a capacitor C2, and the power supply module outputs a second voltage of 1.0V-3.7V to the heating element according to the PWM square wave, so that the heating element is switched from a preheating mode to a constant temperature mode.
The heating element keeps the constant temperature mode, and when the user smoked, there was outside air current constantly through heating cigarette device, the temperature of heating element will reduce, and the resistance of heating element also can reduce simultaneously, but because the second voltage of exporting to the heating element this moment is invariable voltage, and the electric current through the heating element can increase, so the temperature of heating element can rise back immediately, continues to keep in the constant temperature mode.
When the heating element is in a constant temperature mode, the temperature of the heating element is regulated and controlled according to the resistance characteristic of the heating element, the control precision is higher, the control process is stable and simple, and the cost is saved.
Step S3: when a smoking cycle is reached, the cigarette heating device is turned off.
A smoking period T is preset, timing is started from the start of the cigarette heating device, and after the time of one smoking period T is reached, the cigarette heating device is turned off, namely the switch S1A is turned off, and the heating element returns to the temperature at the normal temperature.
In this embodiment, the sliding resistor RL shown in fig. 2 is simulated as a heating element, and the resistance value increases with the temperature according to the characteristics of the resistor. When the heating element is set at normal temperature (25 ℃), the resistance value is set to be 33% of the resistance value at the highest temperature.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (3)
1. The utility model provides a heating cigarette device's automatic temperature control circuit, heating cigarette device includes heating element, its characterized in that: the method comprises the following steps:
the control module is used for controlling the voltage output to the heating element and issuing a switching control instruction to the switching module according to the temperature information of the heating element;
the switching module is used for switching the preheating mode and the constant temperature mode of the heating element according to a switching control instruction issued by the control module;
the switching module is connected with a driving module, and when the switching module receives a switching control instruction which is sent by the control module and used for switching the heating element from the preheating mode to the constant temperature mode, the driving module outputs a corresponding PWM square wave in the constant temperature mode to the switching module;
the temperature measuring module is used for detecting the working temperature value of the heating element in real time and feeding the detected working temperature value back to the control module for recording;
the comparison module is used for acquiring the working temperature value of the heating element detected by the temperature measurement module, and comparing the working temperature value with a preset temperature threshold value so as to send a switching strategy to the control module;
the switching strategy comprises the following steps:
when the working temperature value of the heating element is smaller than a preset temperature threshold value, a strategy for keeping the heating element in a preheating mode is sent to the control module;
when the working temperature value of the heating element is larger than a preset temperature threshold value, a strategy for switching the preheating mode of the heating element into the constant temperature mode is sent to the control module;
the switching module comprises a resistor R3, a resistor R4, a triode Q1, a freewheeling diode D2, a relay K1, a relay K2 and a triode Q2, an I/O output end of the control module is connected with one end of the resistor R3, the other end of the resistor R3 is respectively connected with a base of a triode Q1 and one end of the resistor R4, an emitter of the triode Q1 and the other end of the resistor R4 are grounded, a collector of the triode Q1 is connected with an anode of the freewheeling diode D2, the freewheeling diode D2, the relay K1 and the relay K2 are connected in parallel, the other end of the relay K1 is respectively connected with a base and a collector of a triode Q2, and the other end of the relay K2 is respectively connected with a base of a triode Q2 and the driving module;
the driving module comprises a resistor R1, a resistor R2, a capacitor C1, a capacitor C2 and an NE555 timer, wherein a DIS pin of the NE555 timer is respectively connected with one end of a resistor R1 and one end of a resistor R2, the other end of a resistor R2 is respectively connected with one end of a capacitor C1, a THR pin and a TRI pin of the NE555 timer, a CON pin of the NE555 timer is connected with one end of a capacitor C2, the other end of the capacitor C1, the other end of the capacitor C2 and a GND pin of the NE555 timer are all grounded, and an OUT pin of the NE555 timer is respectively connected with the other end of the relay K2 and a base of the triode Q2.
2. The automatic temperature control circuit of a device for heating cigarettes according to claim 1, characterized in that: the power supply module is used for outputting voltage to the heating element according to the control of the control module.
3. An automatic temperature control method of a cigarette heating device is characterized in that: the method is realized based on the automatic temperature control circuit of the cigarette heating device according to claim 1, and comprises the following steps:
the switch S1A is closed, the cigarette heating device is started, the I/O output end of the control module outputs low level to the switching module, a triode Q1 and a freewheeling diode D2 in the switching module are cut off, a normally open contact of a relay K1 is closed, a normally closed contact of the relay K2 is disconnected, the driving module does not work, the power supply module outputs first voltage to a triode Q2 through a closed switch S1A, the triode Q2 is connected, and the heating element enters a preheating mode;
after the heating element enters a preheating mode, the temperature measuring module detects the temperature of the surface of the heating element in real time to obtain the working temperature value of the heating element, and the working temperature value is fed back to the control module to be recorded;
the comparison module acquires the working temperature value of the heating element detected by the temperature measurement module, and judges the working temperature value of the heating element and the preset temperature threshold value, so that a switching strategy is sent to the control module; the switching strategy comprises the following steps:
when the working temperature value of the heating element is smaller than a preset temperature threshold value, the comparison module sends a strategy for keeping the heating element in a preheating mode to the control module;
when the working temperature value of the heating element is greater than the preset temperature threshold value, the comparison module sends a strategy for switching the preheating mode into the constant temperature mode to the control module, the I/O output end of the control module outputs a high level to the switching module, a triode Q1 and a freewheeling diode D2 in the switching module are switched on, a normally closed contact of a relay K1 is disconnected, a normally open contact of the relay K2 is closed, an NE555 timer in the driving module outputs a corresponding PWM square wave in the constant temperature mode to the triode Q2 according to the resistance values of a resistor R1 and a resistor R2 and the capacitance values of a capacitor C1 and a capacitor C2, and the power supply module outputs a second voltage to the heating element according to the PWM square wave, so that the preheating mode of the heating element is switched into the constant temperature mode.
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| CN114983037A (en) * | 2022-06-17 | 2022-09-02 | 云南中烟工业有限责任公司 | Temperature control method and device for heating body in cigarette heater and heated cigarette |
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