Electronic cigarette

Abstract

The embodiment of the utility model relates to the field of electronic cigarettes, in particular to an electronic cigarette which comprises an atomization assembly, a battery and a circuit board, the atomization assembly comprises a heating piece, a first contact and a second contact, the heating piece is connected between the first contact and the second contact, and the circuit board comprises a load detection circuit. The load detection circuit comprises a switch circuit, a key circuit and a control circuit, the switch circuit connects or disconnects the electric connection between the battery and the first contact, and the key circuit is used for responding to the key pressing operation and outputting a key signal; the control circuit is used for responding to a key signal output by the key circuit to control the switch circuit so as to detect whether the battery, the first contact, the heating piece and the second contact form a loop or not. Therefore, whether the heating element is open or not can be detected without connecting a resistor in series to a power supply loop of the battery, the power consumption of the battery can be reduced, the endurance time of the electronic cigarette can be prolonged, and the battery is prevented from being damaged when the battery is continuously discharged to 0 volt.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of electronic cigarettes, and specifically to an electronic cigarette. Background Art

[0002] Electronic cigarettes are electronic products that imitate cigarettes. In electronic cigarettes, the heating element is one of the core components. The core function of the heating element is to heat and effectively atomize the tobacco oil. The basic principle is to use the battery to supply power to the heating element as a load. The heating element heats up and the tobacco oil and its dissolved substances around the heating element evaporate to form smoke, so that smokers can achieve the effect of puffing out smoke.

[0003] When the electronic cigarette is working, it is generally necessary to detect whether there is a load in the battery power supply circuit or whether the load is damaged to ensure that the electronic cigarette can be used normally. At present, load detection usually involves connecting a large resistance in series in the battery power supply circuit, and detecting whether there is a load in the power supply circuit by detecting the voltage between the large resistance and the load. However, when there is a load in the power supply circuit, the large resistance is also a load in the power supply circuit. Therefore, the large resistance will continue to consume the battery power, reducing the battery life of the electronic cigarette, and even easily reducing the battery voltage to 0 volts and damaging the battery. Utility Model Content

[0004] One purpose of the embodiments of the present application is to provide an electronic cigarette to solve the technical problem of high power consumption in traditional load detection methods.

[0005] The present application embodiment provides an electronic cigarette, comprising:

[0006] An atomizing assembly, the atomizing assembly comprising a heating element, a first contact point and a second contact point, the heating element being connected between the first contact point and the second contact point;

[0007] Batteries; and

[0008] A circuit board, the circuit board comprising a load detection circuit, the load detection circuit comprising:

[0009] a switch circuit, electrically connected to the battery and the first contact respectively, the switch circuit being used to switch on or off the electrical connection between the battery and the first contact;

[0010] A key circuit, used for responding to a key pressing operation and outputting a key signal;

[0011] The control circuit is electrically connected to the battery, the switch circuit, the key circuit and the second contact respectively, and is used to control the switch circuit in response to the key signal to detect whether the battery, the first contact, the heating element and the second contact form a loop.

[0012] Optionally, the control circuit includes:

[0013] A first voltage sampling circuit is electrically connected to the battery, the switch circuit and the second contact respectively;

[0014] The controller is electrically connected to the first voltage sampling circuit, the switch circuit and the key circuit respectively.

[0015] Optionally, the first voltage sampling circuit includes a first resistor and a first capacitor;

[0016] One end of the first resistor is electrically connected to the battery and the switch circuit respectively, the other end of the first resistor is electrically connected to one end of the first capacitor, and the other end of the first capacitor is electrically connected to the second contact.

[0017] Optionally, the switch circuit includes:

[0018] A switch tube, comprising a first end, a second end and a control end, wherein the first end of the switch tube is electrically connected to the battery at the nodes respectively, the second end of the switch tube is electrically connected to the first contact, and the control end of the switch tube is electrically connected to the control circuit;

[0019] The pull-up circuit is electrically connected to the battery, the switch tube, the control end of the switch tube and the control circuit respectively.

[0020] Optionally, the switch tube includes a PNP transistor;

[0021] The emitter of the PNP transistor is the first end of the switch tube, the collector of the PNP transistor is the second end of the switch tube, and the base of the PNP transistor is the control end of the switch tube.

[0022] Optionally, the pull-up circuit includes a second resistor;

[0023] One end of the second resistor is electrically connected to the battery and the first end of the switch tube respectively, and the other end of the second resistor is electrically connected to the control end of the switch tube and the control circuit respectively.

[0024] Optionally, the circuit board further includes an alarm circuit;

[0025] The alarm circuit is electrically connected to the control circuit.

[0026] Optionally, the alarm circuit includes a third resistor and an LED lamp;

[0027] One end of the third resistor is electrically connected to the control circuit, and the other end of the third resistor is electrically connected to the LED lamp.

[0028] Optionally, a charging circuit is also included;

[0029] The charging circuit is electrically connected to the battery and the control circuit respectively.

[0030] Optionally, the charging circuit includes:

[0031] Charging port;

[0032] A filter circuit, electrically connected to the charging interface;

[0033] A second voltage sampling circuit is electrically connected to the charging interface and the control circuit respectively;

[0034] The voltage conversion circuit is electrically connected to the charging interface and the battery respectively.

[0035] The electronic cigarette provided in the embodiment of the present application includes an atomization component, a battery and a circuit board, the atomization component includes a heating element, a first contact and a second contact, the heating element is connected between the first contact and the second contact, the circuit board includes a load detection circuit, the load detection circuit includes a switch circuit, a key circuit and a control circuit, the switch circuit is electrically connected to the battery and the first contact respectively, the switch circuit is used to conduct or disconnect the electrical connection between the battery and the first contact, the key circuit is used to respond to the key pressing operation and output the key signal, the control circuit is electrically connected to the battery, the switch circuit, the key circuit and the second contact respectively, and is used to respond to the key signal to control the switch circuit to detect whether the battery, the first contact, the heating element and the second contact form a loop. Therefore, the present embodiment can detect whether the battery, the first contact, the heating element and the second contact form a loop by controlling the switch circuit connected between the battery and the first contact, and can detect whether the heating element is open without connecting a resistor in series in the power supply circuit of the battery, which is beneficial to reducing the power consumption of the battery, thereby improving the battery life of the electronic cigarette and avoiding the battery from being continuously discharged until it is put into 0 volts and damaging the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0037] Figure 1 A schematic diagram of the structure of an electronic cigarette provided in an embodiment of the present application;

[0038] Figure 2 A schematic diagram of the structure of an electronic cigarette provided by another embodiment of the present application;

[0039] Figure 3A schematic diagram of the structure of an electronic cigarette provided in yet another embodiment of the present application;

[0040] Figure 4 A schematic diagram of the structure of an electronic cigarette provided in yet another embodiment of the present application;

[0041] Figure 5 It is a schematic diagram of the circuit structure of an electronic cigarette provided in an embodiment of the present application. DETAILED DESCRIPTION

[0042] In order to facilitate the understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "connected" to another element, it can be directly connected to the other element, or there can be one or more intermediate elements therebetween. In addition, the terms "first", "second", etc. are used only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0043] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0044] The present application embodiment provides an electronic cigarette. Figure 1 The electronic cigarette 100 includes an atomizer assembly 10 , a battery 20 and a circuit board 30 .

[0045] like Figure 1 As shown, the atomizer assembly 10 includes a smoke oil tank 11 , an atomizer chamber 12 and a nozzle assembly 13 .

[0046] The oil tank 11 is arranged on the top of the electronic cigarette 100 as a container for storing oil. The oil tank 11 is cylindrical, and the cross-sectional shape can be any shape such as circular, elliptical, rectangular, etc. The oil tank 11 can be made of any material, such as various types of plastics or metals. Oil, also known as electronic cigarette liquid, is the electronic atomization liquid used with the electronic cigarette 100. The main components of the oil are edible or medical grade propylene glycol (also known as glycerin), 1,2-propylene glycol (generally not 1,3-propylene glycol) and polyethylene glycol, as well as tobacco flavors.

[0047] The atomizing chamber 12 is located below the oil bin 11. A heating element 121 is provided in the atomizing chamber 12. An oil inlet hole 14 is provided between the atomizing chamber 12 and the oil bin 11. The oil in the oil bin 11 flows into the atomizing chamber 12 through the oil inlet hole 14 and contacts the heating element 121 in the atomizing chamber 12. The heating element 121 can atomize the oil into aerosol.

[0048] The nozzle assembly 13 includes a nozzle body 131 and an inhalation cavity 132 . The nozzle body 131 is disposed at the top of the electronic cigarette 100 . When a user inhales through the nozzle body 131 , the aerosol in the atomization cavity 12 enters the nozzle body 131 through the inhalation cavity 132 and then reaches the user's oral cavity.

[0049] Please also read Figure 2 The atomizer assembly 10 further includes a first contact 15 and a second contact 16 , and the first contact 15 and the second contact 16 serve as metal contact points for connecting the heating element 121 .

[0050] The battery 20 is the power supply part of the electronic cigarette 100, and is used to supply power to the heating element 121 or other electronic components in the electronic cigarette 100. The battery 20 can be a rechargeable battery or a non-rechargeable battery. For the convenience of users, the battery 20 generally uses a rechargeable battery. The battery 20 can be any type of battery, such as a lithium-ion battery or a nickel-hydrogen battery.

[0051] The circuit board 30 is a carrier of electronic components, and mainly plays the role of supporting and connecting various electronic components. The circuit board 30 is used to realize various functions of the electronic cigarette 100, such as power regulation, mode switching, temperature control, power management, etc.

[0052] like Figure 2 As shown, the circuit board 30 includes a load detection circuit 31, and the load detection circuit 31 is used to detect whether the heating element 121 is open-circuited. It can be understood that when the heating element 121 is not open-circuited, the battery 20, the load detection circuit 31, the first contact 15, the heating element 121 and the second contact 16 can form a power supply circuit, and the battery 20 can supply power to the heating element 121 through the power supply circuit, so that the heating element 121 heats the tobacco oil and atomizes the tobacco oil into aerosol. At this time, the electronic cigarette 100 can work normally. When the heating element 121 has problems such as damage and causes an open circuit, the power supply circuit will be disconnected, and the electronic cigarette 100 fails to work normally.

[0053] See also Figure 3 The load detection circuit 31 includes a switch circuit 311 , a button circuit 312 and a control circuit 313 .

[0054] The switch circuit 311 includes a node 3 a , and the switch circuit 311 is electrically connected to the battery 20 at the node 3 a , and is also electrically connected to the first contact 15 , and is used to conduct or disconnect the electrical connection between the battery 20 and the first contact 15 .

[0055] The switch circuit 311 can operate in an on state or an off state. When the switch circuit 311 is in the on state, the battery 20 is electrically connected to the first contact 15 through the switch circuit 311. When the switch circuit 311 is in the off state, the electrical connection between the battery 20 and the first contact 15 is disconnected.

[0056] The key circuit 312 can respond to a key pressing operation and output a key signal. The key circuit 312 includes a key switch, and the key pressing operation is an operation of a user pressing the key switch. The key signal can be any type of electrical signal, such as a high level signal or a low level signal.

[0057] The control circuit 313 is electrically connected to the battery 20 at the node 3a, and is also electrically connected to the switch circuit 311, the key circuit 312 and the second contact 16 respectively. The control circuit 313 is used to control the switch circuit 311 to be in an off state in response to the key signal output by the key circuit 312, and detect the first voltage between the node 3a and the second contact 16 when the switch circuit 311 is in the off state. In addition, the control circuit 313 controls the switch circuit 311 to be in an on state, and detects the voltage between the node 3a and the second contact 16 when the switch circuit 311 is in the on state.

[0058] In this embodiment, when the switch circuit 311 is in the off state, the battery 20, the load detection circuit 31, the first contact 15, the heating element 121 and the second contact 16 do not form a power supply circuit. At this time, the first voltage between the node 3a and the second contact 16 is close to the output voltage of the battery 20. When the switch circuit 311 is in the on state, if the heating element 121 is open, the battery 20, the load detection circuit 31, the first contact 15, the heating element 121 and the second contact 16 do not form a power supply circuit. At this time, the node 3a and the second contact 16 are connected. The second voltage between points 16 is close to the output voltage of the battery 20 and also close to the first voltage. If the heating element 121 is not open, the battery 20, the load detection circuit 31, the first contact 15, the heating element 121 and the second contact 16 form a power supply circuit. At this time, the second voltage between the node 3a and the second contact 16 is less than the output voltage of the battery 20 and also less than the first voltage. Therefore, the control circuit 313 responds to the input of the first voltage and the second voltage, and compares the first voltage and the second voltage to detect whether the heating element 121 is open.

[0059] Therefore, this embodiment controls the disconnection and conduction of the electrical connection between the battery 20 and the first contact 15, and respectively detects the voltage between the node 3a and the second contact 16 when the electrical connection between the battery 20 and the first contact 15 is disconnected, and the voltage between the node 3a and the second contact 16 when the electrical connection between the battery 20 and the first contact 15 is conducted, and detects whether the battery 20, the first contact 15, the heating element 121 and the second contact 16 form a circuit through the two voltages, thereby detecting whether the heating element 121 is open-circuited. Whether the heating element 121 is open-circuited can be detected without connecting a resistor in series with the power supply circuit of the battery 20. This can not only reduce battery power consumption, thereby facilitating the battery life of the electronic cigarette 100, and avoid the battery 20 from being damaged by continuous discharge until it reaches 0 volts, but also reduce the number of electronic components, thereby reducing costs.

[0060] In some embodiments, when the control circuit 313 detects that the heating element 121 is not open-circuited, the control switch circuit 311 is controlled to remain in an on state so that the user can use the electronic cigarette 100 normally.

[0061] In some embodiments, when the control circuit 313 detects that the heating element 121 is open-circuited, it outputs an alarm control signal so that the electronic cigarette 100 generates an alarm message to prompt the user that the heating element 121 has an open-circuit fault. The alarm control signal can be any electrical signal, such as a high-level signal or a low-level signal, and the alarm message can be any type of prompt message, such as light, sound, text, etc.

[0062] In some embodiments, Figure 3 As shown, the circuit board 30 further includes an alarm circuit 32 .

[0063] The alarm circuit 32 is electrically connected to the control circuit 313, and is used to receive an alarm control signal output by the control circuit 313 when it detects that the heating element 121 is open-circuited, and generate alarm information in response to the alarm control signal.

[0064] In some embodiments, see Figure 5 , the alarm circuit 32 includes a third resistor R3 and an LED lamp D1.

[0065] One end of the third resistor R3 is electrically connected to the control circuit 313 , and the other end of the third resistor R3 is electrically connected to the LED lamp D1 .

[0066] In this embodiment, when one end of the third resistor R3 receives a high-level signal output by the control circuit 313, the high-level signal drives the LED lamp D1 to light up through the third resistor R3; when one end of the third resistor R3 receives a low-level signal output by the control circuit 313, the LED lamp D1 is turned off.

[0067] The third resistor R3 is a current limiting resistor, which is used to limit the current flowing through the LED lamp D1 to prevent the LED lamp D1 from being damaged by a large current.

[0068] In some embodiments, the control circuit 313 outputs a switch control signal in response to a key signal output by the key circuit 312. The switch control signal is used to control the on or off of the switch circuit 311. The switch control signal can be any electrical signal, such as a low level signal or a high level signal.

[0069] In some embodiments, see Figure 4 The switch circuit 311 includes a switch tube 3111 and a pull-up circuit 3112 .

[0070] The switch tube 3111 includes a first end 4a, a second end 4b and a control end 4c. The first end 4a of the switch tube 3111 is electrically connected to the battery 20 at the node 3a, the second end 4b of the switch tube 3111 is electrically connected to the first contact 15, and the control end 4c of the switch tube 3111 is electrically connected to the control circuit 313.

[0071] The switch tube 3111 is used to respond to the switch control signal output by the control circuit 313 to be in the on state or the off state. For example, the switch tube 3111 is in the on state in response to the low level signal output by the control circuit 313, and is in the off state in response to the high level signal output by the control circuit 313. The switch tube 3111 can be any type of electronic switch tube, such as a triode, a MOS tube, an IGBT, etc.

[0072] In some embodiments, see Figure 5 The switch tube 3111 includes a PNP transistor Q1.

[0073] The emitter of the PNP transistor Q1 is the first end 4a of the switch tube 3111, the collector of the PNP transistor Q1 is the second end 4b of the switch tube 3111, and the base of the PNP transistor Q1 is the control end 4c of the switch tube 3111, that is, the emitter of the PNP transistor Q1 is electrically connected to the battery 20 at the node 3a, the collector of the PNP transistor Q1 is electrically connected to the first contact 15, and the base of the PNP transistor Q1 is electrically connected to the control circuit 313.

[0074] In this embodiment, when the base of the PNP transistor Q1 receives a low-level signal output by the control circuit 313, the conduction condition of the PNP transistor Q1 is met, and the PNP transistor Q1 is in the on state. When the base of the PNP transistor Q1 receives a high-level signal output by the control circuit 313, the conduction condition of the PNP transistor Q1 is not met, and the PNP transistor Q1 is in the cut-off (disconnected) state.

[0075] The pull-up circuit 3112 is electrically connected to the battery 20 and the switch tube 3111 at the node 3 a , and is also electrically connected to the control terminal 4 c of the switch tube 3111 and the control circuit 313 .

[0076] The pull-up circuit 3112 is used to clamp the uncertain signal output by the control circuit 313 to a high level signal to prevent the switch tube 3111 from being mistakenly turned on.

[0077] In some embodiments, Figure 5 As shown, the pull-up circuit 3112 includes a second resistor R2.

[0078] One end of the second resistor R2 is electrically connected to the battery 20 and the first end 4a of the switch tube 3111 at the node 3a, and the other end of the second resistor R2 is electrically connected to the control end 4c of the switch tube 3111 and the control circuit 313.

[0079] In some embodiments, see Figure 4 The control circuit 313 includes a first voltage sampling circuit 3131 and a controller 3132 .

[0080] The first voltage sampling circuit 3131 is electrically connected to the battery 20 and the switch circuit 311 at the node 3a, and is also electrically connected to the second contact 16, for sampling the voltage between the node 3a and the second contact 16, and outputting a first sampling signal. The first sampling signal is a signal for indirectly detecting the voltage between the node 3a and the second contact 16, and the voltage of the first sampling signal is usually smaller than the voltage between the node 3a and the second contact 16, and the voltage of the first sampling signal is in a preset proportional relationship with the voltage between the node 3a and the second contact 16.

[0081] In some embodiments, see Figure 5 The first voltage sampling circuit 3131 includes a first resistor R1 and a first capacitor C1.

[0082] One end of the first resistor R1 is electrically connected to the battery 20 and the switch circuit 311 at the node 3 a , the other end of the first resistor R1 is electrically connected to one end of the first capacitor C1 , and the other end of the first capacitor C1 is electrically connected to the second contact 16 .

[0083] In this embodiment, the first resistor R1 and the first capacitor C1 form an RC circuit, which divides the voltage between the node 3a and the second contact 16 and outputs it to the controller 3132 for processing. Since this sampling circuit structure does not need to use multiple resistors, it can reduce hardware costs.

[0084] The controller 3132 is electrically connected to the first voltage sampling circuit 3131 , the switch circuit 311 and the key circuit 312 respectively, and is used for responding to the sampling signal and detecting the voltage between the node 3 a and the second contact 16 .

[0085] As described above, since the voltage of the sampling signal is in a preset proportional relationship with the voltage between the node 3a and the second contact 16, the controller 3132 can convert the voltage between the node 3a and the second contact 16 by the preset proportional relationship and the voltage of the first sampling signal.

[0086] In this embodiment, the controller 3132 can be any general purpose processor, digital signal processor (DSP), application specific integrated circuit (ASIC), field programmable gate array (FPGA), single chip microcomputer, ARM (Acorn RISC Machine) or other programmable logic device, discrete gate or transistor logic, discrete hardware components or any combination of these components. In addition, the controller 3132 can also be any conventional processor, controller, microcontroller or state machine. The controller 3132 can also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors combined with a DSP and / or any other such configuration.

[0087] When the battery 20 is a rechargeable battery, the external input voltage usually does not directly charge the battery 20. Therefore, in order to charge the battery 20, in some embodiments, refer to Figure 1 The circuit board 30 also includes a charging circuit 33, which is used to receive an input voltage and convert the input voltage into a target voltage to charge the battery 20.

[0088] In some embodiments, see Figure 4 The charging circuit 33 includes a charging interface 331 , a filter circuit 332 , a second voltage sampling circuit 333 and a voltage conversion circuit 334 .

[0089] The charging interface 331 is used to plug into the USB interface to receive input voltage. The charging interface 331 is an interface for receiving the charging voltage (input voltage) transmitted to the electronic cigarette 100 from the outside. The USB interface is an interface for transmitting the charging voltage to the electronic cigarette 100 from the outside. The input voltage is the voltage output by the USB interface. The input voltage can be various voltages such as 5V, 12V, etc.

[0090] The filter circuit 332 is electrically connected to the charging interface 331 and is used for filtering the input voltage.

[0091] In some embodiments, Figure 5 As shown, the filtering circuit 332 includes a second capacitor C2.

[0092] One end of the second capacitor C2 is electrically connected to the charging interface 331 , and the other end of the second capacitor C2 is grounded.

[0093] The second voltage sampling circuit 333 is electrically connected to the charging interface 331 and the control circuit 313 respectively, and is used to sample the input voltage and output a second sampling signal to the control circuit 313. The second sampling signal is a signal for indirectly detecting the input voltage. When the charging interface 331 receives the input voltage, the voltage of the second sampling signal is usually less than the input voltage, and the voltage of the second sampling signal is in a preset proportional relationship with the input voltage.

[0094] The control circuit 313 can respond to the second sampling signal output by the second voltage sampling circuit 333 and output a state control signal, so that the electronic cigarette 100 responds to the state control signal to generate state display information to prompt the user of the charging state of the electronic cigarette 100. The state control signal can be any electrical signal, such as a high level signal or a low level signal, and the state display information can be any type of prompt information, such as light, text, etc.

[0095] In some embodiments, Figure 5 As shown, the second voltage sampling circuit 333 includes a fourth resistor R4 and a fifth resistor R5.

[0096] One end of the fourth resistor R4 is electrically connected to the charging interface 331 , the other end of the fourth resistor R4 is electrically connected to one end of the fifth resistor R5 and the control circuit 313 , and the other end of the fifth resistor R5 is grounded.

[0097] In this embodiment, the fourth resistor R4 and the fifth resistor R5 are used to divide the input voltage and output a second sampling signal at the connection point of the fourth resistor R4 and the fifth resistor R5. The voltage Vs2 of the second sampling signal is VIN*R5 / (R4+R5), VIN is the input voltage, R4 is the resistance value of the fourth resistor R4, and R5 is the resistance value of the fifth resistor R5. The voltage Vs2 of the second sampling signal is proportional to the input voltage VIN, and the proportional relationship between the voltage Vs2 of the second sampling signal and the input voltage VIN is Vs2:VIN=R5:(R4+R5).

[0098] The voltage conversion circuit 334 is electrically connected to the charging interface 331 and the battery 20 respectively, and is used to convert the input voltage into a target voltage to charge the battery 20. The target voltage can be any suitable voltage, such as 3.7V, as long as it meets the charging requirements of the battery 20.

[0099] In some embodiments, the voltage conversion circuit 334 can perform any voltage conversion processing such as step-down or step-up on the input voltage to obtain the target power supply.

[0100] In some embodiments, Figure 5 As shown, the voltage conversion circuit 334 includes a charging chip U1, a sixth resistor R6 and a third capacitor C3.

[0101] The charging chip U1 includes a voltage input terminal VIN, a voltage output terminal BAT+, a ground terminal GND and a status indication terminal I. The voltage input terminal VIN of the charging chip U1 is connected to the charging interface 331. The status indication terminal I of the charging chip U1 is electrically connected to one end of the sixth resistor R6. The other end of the sixth resistor R6 and the ground terminal GND of the charging chip U1 are grounded. The voltage output terminal BAT+ of the charging chip U1 is electrically connected to one end of the third capacitor C3 and the battery 20 respectively. The other end of the third capacitor C3 is grounded.

[0102] The sixth resistor R6 is a current limiting resistor, which is used to prevent the chip from being damaged by excessive current. The third capacitor C3 is used for energy storage and filtering to achieve stable charging of the battery 20.

[0103] In some embodiments, the model of the charging chip U1 is 4054B, which is a complete single-cell lithium-ion battery constant current / constant voltage linear charging chip.

[0104] Finally, it should be noted that the present application can be implemented in many different forms and is not limited to the embodiments described in this specification. These embodiments are not intended to be additional limitations on the content of the present application. The purpose of providing these implementation methods is to make the understanding of the disclosure of the present application more thorough and comprehensive. In addition, under the idea of ​​the present application, the above-mentioned technical features continue to be combined with each other, and there are many other changes in different aspects of the present application as described above, which are all considered to be within the scope of the present application specification; further, for ordinary technicians in this field, they can be improved or transformed according to the above description, and all these improvements and transformations should belong to the scope of protection of the claims attached to the present application.

Claims

1. An electronic cigarette, characterized in that: include: An atomizing assembly, the atomizing assembly comprising a heating element, a first contact point and a second contact point, the heating element being connected between the first contact point and the second contact point; Battery; as well as A circuit board, the circuit board comprising a load detection circuit, the load detection circuit comprising: a switch circuit, electrically connected to the battery and the first contact respectively, the switch circuit being used to switch on or off the electrical connection between the battery and the first contact; A key circuit, used for responding to a key pressing operation and outputting a key signal; The control circuit is electrically connected to the battery, the switch circuit, the key circuit and the second contact respectively, and is used to control the switch circuit in response to the key signal output by the key circuit to detect whether the battery, the first contact, the heating element and the second contact form a loop.

2. The electronic cigarette according to claim 1, characterized in that: The control circuit comprises: A first voltage sampling circuit is electrically connected to the battery, the switch circuit and the second contact respectively; The controller is electrically connected to the first voltage sampling circuit, the switch circuit and the key circuit respectively.

3. The electronic cigarette according to claim 2, characterized in that: The first voltage sampling circuit includes a first resistor and a first capacitor; One end of the first resistor is electrically connected to the battery and the switch circuit respectively, the other end of the first resistor is electrically connected to one end of the first capacitor, and the other end of the first capacitor is electrically connected to the second contact.

4. The electronic cigarette according to claim 1, characterized in that: The switch circuit comprises: A switch tube, comprising a first end, a second end and a control end, wherein the first end of the switch tube is electrically connected to the battery, the second end of the switch tube is electrically connected to the first contact, and the control end of the switch tube is electrically connected to the control circuit; The pull-up circuit is electrically connected to the battery, the switch tube, the control end of the switch tube and the control circuit respectively.

5. The electronic cigarette according to claim 4, characterized in that: The switch tube comprises a PNP type triode; The emitter of the PNP transistor is the first end of the switch tube, the collector of the PNP transistor is the second end of the switch tube, and the base of the PNP transistor is the control end of the switch tube.

6. The electronic cigarette according to claim 4, characterized in that: The pull-up circuit includes a second resistor; One end of the second resistor is electrically connected to the battery and the first end of the switch tube respectively, and the other end of the second resistor is electrically connected to the control end of the switch tube and the control circuit respectively.

7. The electronic cigarette according to claim 1, characterized in that: The circuit board also includes an alarm circuit; The alarm circuit is electrically connected to the control circuit.

8. The electronic cigarette according to claim 7, characterized in that: The alarm circuit includes a third resistor and an LED lamp; One end of the third resistor is electrically connected to the control circuit, and the other end of the third resistor is electrically connected to the LED lamp.

9. The electronic cigarette according to claim 1, characterized in that: Also includes a charging circuit; The charging circuit is electrically connected to the battery and the control circuit respectively.

10. The electronic cigarette according to claim 9, characterized in that: The charging circuit comprises: Charging port; A filter circuit, electrically connected to the charging interface; A second voltage sampling circuit is electrically connected to the charging interface and the control circuit respectively; The voltage conversion circuit is electrically connected to the charging interface and the battery respectively.

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