WO2022239343A1 - Circuit unit for aerosol generation device, and aerosol generation device - Google Patents

Abstract

A circuit unit of an aerosol generation device according to the present invention comprises: a heater connector to which a heater that consumes power supplied from a power supply and heats an aerosol source is connected; a controller that includes a first communication terminal and a second communication terminal for serial communications and controls the supply of power to the heater from the power supply; a first IC that is separate from the controller and that includes a third communication terminal for serial communications; a second IC that is separate from the controller and the first IC and that includes a fourth communication terminal for serial communications; a first communication line that connects the first communication terminal and the third communication terminal; a second communication line that connects the second communication terminal and the fourth communication terminal; a first substrate; and a second substrate that is separate from the first substrate and that is distanced from the first substrate, wherein the controller and the first IC are mounted on the first substrate, and the second IC is mounted on the second substrate.

Description

Circuit unit of aerosol generator and aerosol generator

The present invention relates to a circuit unit of an aerosol generator and an aerosol generator.

Electronic cigarettes and heat-not-burn cigarettes are known as devices that generate aerosol by heating an aerosol source. E-cigarettes produce an aerosol by atomizing a liquid that is an aerosol source. On the other hand, heat-not-burn cigarettes generate an aerosol by heating a stick, which is an aerosol source, without burning it. Hereinafter, electronic cigarettes and heat-not-burn cigarettes are collectively referred to as "aerosol generators." It should be noted that unless otherwise specified, the term "aerosol generator" includes nebulizers, electronic cigarettes, and heat-not-burn cigarettes that do not contain tobacco-derived ingredients in the aerosol source.

Japanese Patent Publication No. 2019-526889 Japanese Patent Application Publication No. 2019-511909 U.S. Patent Application Publication No. 2020/0000146

Today's aerosol generators may have multiple ICs as they become more sophisticated. Serial communication is adopted for communication between a plurality of ICs. On the other hand, as the number of ICs connected by serial communication increases, the wiring pattern on the board becomes more complicated and denser. As a result, costs and heat generation increase, and communication busyness may also increase.

An object of the present invention is to provide an aerosol generator and its circuit unit with improved mounting of electrical components on a substrate for serial communication.

A first feature includes a heater connector connected to a heater that consumes power supplied from a power supply to heat an aerosol source, and a first communication terminal and a second communication terminal for serial communication, A controller that controls power supply to the heater and the controller are separate entities, and a first IC including a third communication terminal for serial communication, the controller and the first IC are separate entities, and a second IC including a fourth communication terminal for serial communication, a first communication line connecting the first communication terminal and the third communication terminal, and the second communication terminal and the fourth communication terminal. a second communication line to be connected, a first substrate, and a second substrate separate from the first substrate and separated from the first substrate, wherein the controller and the first IC are: A circuit unit of an aerosol generator mounted on the first substrate and the second IC mounted on the second substrate.
A second feature is the circuit unit according to the first feature, wherein the communication protocol used in the first communication line is the same as the communication protocol used in the second communication line.
A third feature is the circuit unit according to the first feature, wherein the communication protocol used in the first communication line is I2C or SPI.
A fourth feature is the circuit unit according to the second or third feature, wherein the second board is a board adjacent to the first board, and the communication protocol used in the second communication line is I2C. or SPI.
A fifth feature is the circuit unit according to the second or third feature, wherein the a third substrate; and a third communication line connecting a sixth communication terminal of the first substrate and a seventh communication terminal of the third substrate, wherein the third substrate is closer to the second substrate than the second substrate. is separated from the first substrate, and the communication protocol used in the third communication line is UART.
A sixth feature is the circuit unit according to any one of the second to fifth features, wherein the communication frequency on the second communication line is higher than the communication frequency on the first communication line, and the communication frequency on the first communication line is higher than that on the first communication line. The communication protocol used on the communication line is I2C.
A seventh feature is the circuit unit according to any one of the second to fifth features, wherein the number of ICs connected to the controller via the first communication line is equal to the number of ICs connected to the second communication line. and the communication protocol used on the first communication line is I2C.
An eighth feature is the circuit unit according to any one of the first to seventh features, wherein the controller, the first IC, and the second IC are separated from each other, and a circuit unit for serial communication is provided. A third IC including a fifth communication terminal is further provided, the first communication line connects the first communication terminal and the fifth communication terminal, and the third IC is mounted on the first substrate.
A ninth feature is the circuit unit according to the eighth feature, wherein the controller communicates with the first IC when a first condition is satisfied, and a second condition different from the first condition is satisfied, it is configured to communicate with the third IC.
A tenth feature is the circuit unit according to the eighth feature, wherein the controller operates in any one of a plurality of modes, and the controller operates in one of a plurality of modes, and the controller operates in the first IC and the third IC in the plurality of modes. includes a mode of communicating only with the third IC.
An eleventh feature is the circuit unit according to any one of the first to tenth features, wherein the number of ICs connected to the controller via the first communication line is equal to the second communication line. more than the number of ICs connected to the controller via .
A twelfth feature is the circuit unit according to the eleventh feature, wherein the IC connected to the controller via the second communication line is only the second IC.
A thirteenth feature is the circuit unit according to the twelfth feature, wherein the second IC is a fuel gauge IC that acquires information on the power supply.
A fourteenth feature is the circuit unit according to the first feature, wherein a communication protocol used in the first communication line is different from a communication protocol used in the second communication line.
A fifteenth feature includes a heater connector to which a heater that consumes power supplied from a power source and heats the aerosol source is connected, and a first communication terminal and a second communication terminal for serial communication. A controller that controls power supply to the heater and the controller are separate entities, and a first IC including a third communication terminal for serial communication, the controller and the first IC are separate entities, and a second IC including a fourth communication terminal for serial communication, a first communication line connecting the first communication terminal and the third communication terminal, and the second communication terminal and the fourth communication terminal. a second communication line to be connected, a first substrate, and a second substrate separate from the first substrate and separated from the first substrate, wherein the controller and the first IC are: The aerosol generating device is mounted on the first substrate, and the second IC is mounted on the second substrate.

According to the first feature, complication and high density of wiring can be suppressed, and the cost of the aerosol generator can be reduced.
According to the second feature, complication and high density of wiring can be suppressed, and the cost of the aerosol generator can be reduced.
According to the third feature, the MCU can communicate with the IC frequently and without delay, and the aerosol generator can be made highly functional.
According to the fourth feature, the cost of the aerosol generator can be reduced by suppressing the complexity and density of the wiring, and the MCU can communicate with the IC frequently and without delay, thereby improving the functionality of the aerosol generator. realizable.
According to the fifth feature, by adopting a protocol according to the distance between substrates, it is possible to reduce the cost of the aerosol generating device and achieve high functionality of the aerosol generating device.
According to the sixth feature, the cost of the aerosol generating device can be reduced and the functionality of the aerosol generating device can be improved by I2C communication, which can simplify wiring due to the small number of terminals used for communication.
According to the seventh feature, the cost of the aerosol generator can be reduced and the functionality of the aerosol generator can be improved by means of I2C communication in which the number of first communication terminals of the controller does not change even if the number of connected ICs increases. can be realized.
According to the eighth feature, the controller does not need to have a dedicated communication terminal for communicating with the third IC. , it is possible to achieve high functionality of the aerosol generator.
According to the ninth feature, since the communication timings of the plurality of ICs sharing the first communication line do not overlap, a decrease in communication speed can be suppressed.
According to the tenth feature, the communication modes of the plurality of ICs sharing the first communication line are different, so it is possible to suppress a decrease in communication speed and realize high functionality of the aerosol generating device.
According to the eleventh feature, since the frequency of communication with the ICs connected to the second communication line can be improved, the accuracy of control using information from the ICs connected to the second communication line can be improved.
According to the twelfth feature, since the frequency of communication with the second IC can be improved without restriction, the accuracy of control using information of the second IC connected to the second communication line can be improved.
According to the thirteenth feature, the latest information on the power supply can be easily obtained from the fuel gauge IC, so the safety of the aerosol generating device can be improved.
According to the fourteenth feature, the communication speed and accuracy of communication with the IC can be improved by communication using an appropriate protocol according to the characteristics and mounting method of the IC.
According to the fifteenth feature, complication and high density of wiring are suppressed, and the cost of the aerosol generator can be reduced.

It is a figure which observes the front side of an aerosol generation apparatus from diagonally upper direction. It is a figure which observes the front side of an aerosol generation apparatus from the diagonally downward direction. It is a figure which observes the upper surface of the aerosol generator which removed the shutter. It is a figure which observes a main body housing from the front from which the external panel was removed. It is a figure explaining the structural example in an external case which appears by removing an internal panel. FIG. 4 is a diagram for explaining an appearance example of a circuit unit incorporated in an external case; 4 is a diagram illustrating a configuration example of the front side of the MCU substrate used in Embodiment 1; FIG. 4 is a diagram for explaining a configuration example of the back side of the MCU board used in Embodiment 1; FIG. FIG. 2 is a diagram for explaining circuit elements appearing on a power supply line and voltages appearing between the circuit elements; 3 is a diagram illustrating an internal configuration example of a charging IC used in Embodiment 1; FIG. FIG. 4 is a diagram illustrating a power supply path of a charging IC operating in a charging mode; BUS voltage V It is a diagram for explaining a power supply path of a charging IC operating in a power supply mode by _USB . FIG. 4 is a diagram for explaining power supply paths of a charging IC operating in a power supply mode using a _USB voltage _VUSB and a battery voltage VBAT; FIG. 4 is a diagram illustrating a power supply path of a charging IC operating in a power supply mode based on a battery voltage _VBAT ; FIG. 4 is a diagram for explaining a power supply path of a charging IC operating in a power supply mode with an OTG function for battery voltage _VBAT ; FIG. 3 is a diagram illustrating a configuration example of the front side of a USB connector board used in Embodiment 1; 4 is a diagram illustrating a configuration example of the rear surface side of the USB connector board used in Embodiment 1; FIG. It is a figure explaining the function of fuel gauge IC. 3 is a diagram for explaining a configuration example of a Bluetooth substrate and a Hall IC substrate used in Embodiment 1; FIG. FIG. 4 is a diagram illustrating an example of a communication protocol employed by circuit units; It is a figure explaining the image of I2C communication. FIG. 3 is a diagram for explaining operation modes prepared in the aerosol generating device used in Embodiment 1 and transition conditions between the operation modes. 4 is a chart for explaining the content of communication for each operation mode according to Embodiment 1. FIG. It is a figure explaining communication in charge mode M1. FIG. 11 is a chart for explaining the content of communication for each operation mode according to the second embodiment; FIG. FIG. 11 is a chart for explaining the content of communication for each operation mode in Embodiment 3; FIG. 1 is a diagram for explaining a connection form of SPI communication, which is one form of serial communication; FIG. FIG. 2 is a diagram illustrating an example of an external configuration of an aerosol generating device compatible with electronic cigarettes;

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each drawing, the same parts are indicated by the same reference numerals.

<Embodiment 1>
<External configuration example of aerosol generator>
First, an example of the external configuration of the aerosol generator 1 used in Embodiment 1 will be described. The aerosol generator 1 used in Embodiment 1 is a form of heated cigarette.
FIG. 1A is a view of the front side of the aerosol generating device 1 observed obliquely from above.
FIG. 1B is a view of the front side of the aerosol generating device 1 observed obliquely from below.
FIG. 1C is a diagram for observing the upper surface of the aerosol generator 1 with the shutter 30 removed.
FIG. 1D is a front view of the body housing 20 with the external panel 10 removed.

The aerosol generator 1 used in Embodiment 1 has a size that allows a user to hold it with one hand.
The aerosol generator 1 has a body housing 20, an external panel 10 attached to the front of the body housing 20, and a shutter 30 arranged on the upper surface of the body housing 20 and slidable along the upper surface. .
The external panel 10 is a member that can be attached to and detached from the body housing 20 . A user attaches and detaches the external panel 10 in the first embodiment.

The external panel 10 is provided with an information window 10A. The information window 10A is provided at a position facing the light emitting element provided on the body housing 20 side. In the case of Embodiment 1, an LED (=Light Emitting Diode) 302 (see FIG. 2B) is used as the light emitting element.
The information window 10A in Embodiment 1 is made of a material that transmits light. However, the information window 10A may be a hole penetrating from the front surface to the back surface. The lighting and blinking of the light-emitting elements represent the state of the aerosol generating device 1 . Lighting and blinking of the light emitting element may be controlled by the MCU 101, which will be described later.
The external panel 10 serves not only as decoration but also as a buffer for heat emitted from the body housing 20 .

The external panel 10 deforms when the user presses a position below the information window 10A with a fingertip. When the external panel 10 is depressed by pressing with a fingertip, a push button 23 provided on the main body housing 20 can be pressed.

A type C USB (=Universal Serial Bus) connector 21 is provided on the bottom side of the body housing 20 . Note that the shape and type of the USB connector 21 are examples. In other words, the USB connector 21 may be a USB other than type C. In the case of Embodiment 1, the USB connector 21 is exclusively used for charging the battery 50 (see FIG. 2A) built in the body housing 20 .
Further, an insertion hole 22 is provided on the upper surface of the body housing 20, into which a stick as an aerosol source is inserted into the paper tube. The stick has a substantially cylindrical appearance wrapped in a paper tube. The insertion hole 22 is exposed when the shutter 30 is opened and is hidden when the shutter 30 is closed.
In the case of Embodiment 1, the opening of insertion hole 22 is substantially circular. The diameter of the opening is such that a substantially cylindrical stick can be inserted. In other words, the diameter of the stick is such that it can be inserted into the insertion hole 22 .

A magnet is attached inside the shutter 30 . The opening/closing of the shutter 30 is detected by a Hall IC 401 (see FIG. 2B) provided on the body housing 20 side.
The Hall IC 401 is also called a magnetic sensor, and is composed of a Hall element, an operational amplifier, and the like. A Hall element is an element that outputs a voltage corresponding to the strength of the magnetic field of a magnet.
The body housing 20 is composed of an inner panel 20A and an outer case 20B. In the case of Embodiment 1, the inner panel 20A is screwed to the outer case 20B.

A push button 23 is arranged substantially in the center of the inner panel 20A. As described above, push button 23 is operated by deformation of external panel 10 . Through the operation of the push button 23, the tactile switch 301 (see FIG. 2B) on the side of the outer case 20B located behind the push button 23 is operated.
The push button 23 is used, for example, to turn on/off the power of the device main body, heat the heater, and perform Bluetooth pairing. If the push button 23 is pressed for a long time (for example, if it is pressed for 5 seconds or more) with the external panel 10 removed, the reset function is activated. In addition, in the case of Embodiment 1, BLE (=Bluetooth Low Energy) is used as Bluetooth.
Note that the push button 23 may be omitted by exposing the tactile switch 301 from substantially the center of the internal panel 20A. In this case, the deformation of the external panel 10 is transmitted directly to the tactile switch 301. FIG.

A translucent component 24 that transmits light is exposed at a position corresponding to the information window 10A of the external panel 10 on the internal panel 20A. The translucent component 24 is arranged at a position covering the surface of the LED 302 .
Magnets 25 used for attaching the external panel 10 are provided on the upper and lower parts of the internal panel 20A. The magnet 25 is provided at a position facing the magnet on the external panel 10 side. By these magnets, the outer panel 10 is detachably attached to the inner panel 20A.
In the case of Embodiment 1, the magnet 25 is fixed to the chassis 500 (see FIG. 2A) inside the outer case 20B and exposed through the opening of the inner panel 20A. As an alternative to the first embodiment, magnets 25 may be fixed to inner panel 20A.

<Example of internal configuration of aerosol generator>
FIG. 2A is a diagram illustrating a configuration example inside the outer case 20B that appears when the inner panel 20A (see FIG. 1D) is removed.
FIG. 2B is a diagram illustrating an appearance example of the circuit unit 1000 built in the outer case 20B. In Embodiment 1, a circuit unit 1000 is a portion obtained by removing the battery 50, the chassis 500, and the heater of the heating unit 40 from the external case 20B.

In the external case 20B in Embodiment 1, there are a heating unit 40, a battery 50, an MCU (=Micro Control Unit) board 100, a USB connector board 200, an LED and Bluetooth (registered trademark) board 300, A Hall IC substrate 400, a vibrator 60, and a chassis 500 to which these members are attached are provided. That is, four separate substrates are provided in the outer case 20B. The four substrates are spaced apart from each other.

The heating unit 40 is a unit that heats the tobacco stick inserted into the insertion hole 22 (see FIG. 1C). The insertion hole 22 is defined as a space surrounded by the inner wall of the cylindrical container 22A.
The container 22A used in Embodiment 1 has a bottom. However, a bottomless container 22A may also be used.
In the case of the container 22A used in Embodiment 1, a flat portion is prepared on its side wall. In other words, a flat portion is provided in the cross section when the container 22A is cut along a plane perpendicular to the axis of the container 22A.

The flat portion compresses and deforms the side surface of the tobacco stick inserted into the opening of the insertion hole 22 (see FIG. 1C) to improve heating efficiency. The cross-sectional shape may be substantially circular, substantially elliptical, or substantially polygonal. Further, the cross-sectional shape may be the same from the opening side to the bottom surface, or may vary from the opening side to the bottom surface.

The container 22A is preferably made of metal with high thermal conductivity. In the case of Embodiment 1, the container 22A is made of stainless steel, for example.
A film-like heater is arranged around the outer periphery of the container 22A to cover the outer peripheral surface. The heater generates heat by consuming power supplied from the battery 50 . When the heater generates heat, the stick is heated from the outer periphery and an aerosol is generated.

The heating unit 40 is connected to heater connectors 206A and 206B (see FIG. 7A) provided on the USB connector board 200 to receive power. The heating unit 40 is also provided with a thermistor 41 used to detect a puff (that is, intake air) and a thermistor 42 used to measure the temperature of the heater. The resistance values of the thermistor 41 and the thermistor 42 change greatly due to the temperature rise caused by the heat generation of the heater and the temperature drop caused by the puff.
As the thermistor 41, a PTC (=Positive Temperature Coefficient) thermistor whose resistance value increases as the temperature rises may be used, or an NTC (=Negative Temperature Coefficient) thermistor whose resistance value decreases as the temperature rises may be used. may Similarly, the thermistor 42 may be a PTC thermistor or an NTC thermistor.
A change in the resistance value of the thermistor 41 or thermistor 42 is detected by the MCU 101 (see FIG. 3A) as a voltage change.
In addition, the MCU 101 measures the temperature of the external case 20B through a separate thermistor.

The battery 50 is a power source that supplies power necessary for operating the circuit unit built in the outer case 20B. In Embodiment 1, a rechargeable lithium ion secondary battery or the like is used as the battery 50 . Power from the battery 50 is supplied to each part through a power line connected to the negative electrode 51 and the positive electrode 52 .
A thermistor 53 used for measuring the temperature of the battery 50 (hereinafter referred to as "battery temperature") is provided on the outer circumference of the battery 50. As shown in FIG. A change in the resistance value of the thermistor 53 is detected as a change in voltage by the fuel gauge IC 201 (see FIG. 7B) on the USB connector board 200 . The thermistor 53 may be a PTC thermistor or an NTC thermistor.

<Structure of MCU board 100>
FIG. 3A is a diagram illustrating a configuration example of the front side of the MCU board 100 used in the first embodiment.
FIG. 3B is a diagram illustrating a configuration example of the back side of the MCU board 100 used in the first embodiment.
The front and back surfaces in FIGS. 3A and 3B are used only in the description of the first embodiment.
The MCU board 100 is a double-sided mounting board.

The MCU board 100 is mounted with an MCU 101 that controls the overall operation of the device, an EEPROM 102 that records information regarding the use of the device, and a charging IC 103 that switches the power supply path.
The MCU 101 is a so-called controller. The operation of the MCU 101 is defined through execution of firmware and programs operating on the firmware.
The MCU 101 in Embodiment 1 uses I2C communication and UART communication, which are serial communication methods, for communication with other ICs. In the case of the first embodiment, two communication lines for I2C communication are prepared.

The first system is a communication line used by the MCU 101 for I2C communication with the EEPROM 102 and the charging IC 103 mounted on the same substrate (that is, the MCU substrate 100).
The second system is a communication line used by the MCU 101 for I2C communication with the fuel gauge IC 201 mounted on another board adjacent to the MCU board 100 (that is, the USB connector board 200).
The first system and the second system do not have electrical contacts. Therefore, the communication of the first system and the communication of the second system are independent of each other. The MCU 101 uses UART communication to communicate with the LED located farther than the USB connector board 200 when viewed from the MCU board 100 and the Bluetooth IC 303 (see FIG. 9) mounted on the Bluetooth board 300 .

The charging IC 103 is provided with a _BAT terminal for receiving the battery voltage VBAT from the battery 50 and a VBUS terminal for receiving the BUS voltage _VUSB from an external power supply.
In the case of the aerosol generator 1 according to Embodiment 1, the power supply line used for supplying the battery voltage V _BAT is branched into two systems. Charging IC 103 is connected to one power supply line. The other power supply line is connected to a fuel gauge IC 201 and a step-up DC/DC circuit 202 (see FIG. 7B) that generates voltage to be applied to the heater. In addition, the battery voltage V _BAT is also connected to the battery 50 protection IC 203 (see FIG. 7B).

A load switch 104 is mounted on the MCU board 100 to turn on or off the power line that connects the external power supply and the charging IC 103 . An external power supply is an external device connected through the USB connector 21 . External devices here include, for example, personal computers, smart phones, tablet terminals, and outlets.

The MCU board 100 is mounted with a step-up/step-down DC/DC circuit 105 that generates a 3.3V system power supply _{Vcc33_0} from the voltage _Vcc output from the charging IC 103 . The step-up/step-down DC/DC circuit 105 may step up the voltage _Vcc output from the charging IC 103 to generate the system power supply _{Vcc33_0} , or step down the voltage _Vcc output from the charging IC 103 to generate the system power supply Vcc. _{cc33_0} may be generated, or the voltage _Vcc output from the charging IC 103 may be directly output to generate the system power supply _{Vcc33_0} .
The buck-boost DC/DC circuit 105 boosts the battery voltage V _BAT when it is lower than 3.3V, and steps it down when the battery voltage V _BAT is higher than 3.3V, so that the battery voltage V _BAT reaches 3.3V. If equal, output as is.
The system power supply _{Vcc33_0} here is a primitive power supply that continues to be supplied even when the MCU 101 is not operating.

The system power supply _{Vcc33_0} is supplied through the power supply line to the power switch driver 108, the load switch 106 for stopping the system, and the flip-flop 107 that latches (stores) a value indicating whether or not the heater is in an overheating state. In other words, these circuit elements operate even when the system is stopped.
When the system stop load switch 106 is off, only the circuit elements to which the system power supply _{Vcc33_0} is supplied are in an operating state. As a result, most circuit elements including the MCU 101 stop operating.

A power switch driver 108 is mounted on the MCU board 100 . The power switch driver IC 108 is a circuit that controls the on/off of the load switch 106 .
When the power switch driver 108 detects that the push button 23 (see FIG. 1D) is pressed while the external panel 10 is removed, the power switch driver 108 controls the load switch 106 to be off.
The removal of the external panel 10 is performed by a Hall IC 304 (see FIG. 9) used to detect attachment and detachment of the external panel 10 to the main body housing 20 and a single Schmidt trigger inverter 305 (see FIG. 9) whose input is the output potential of the Hall IC 304. ).

The MCU 101 is not involved in the control of the load switch 106 by the power switch driver 108 . That is, control of the load switch 106 is executed independently of the MCU 101 .
In the present embodiment, the 3.3V system power supply supplied to each part from the ON state load switch 106 is denoted as _Vcc33 to distinguish it from the system power supply _{Vcc33_0} that continues to be supplied even when the system is stopped.

The MCU board 100 is mounted with a load switch 109 that supplies the system power supply _{VCC33_SLP} to the three thermistors described above when the shutter 30 is open.
Therefore, when the shutter 30 is closed, the three thermistors are not supplied with the system power supply V _{CC33_SLP} . The load switch 109 is supplied with the system power supply _Vcc33 of 3.3V from the load switch 106 for system stop.
The MCU board 100 is mounted with a flip-flop 110 that latches a value indicating whether the temperature of the external case 20B is abnormal. The flip-flop 110 is supplied with the system power supply _Vcc33 from the load switch 106 for stopping the system.

An operational amplifier 111 used for measuring heater resistance (heater temperature) is mounted on the MCU board 100 .
A connector 112 for the vibrator 60 is mounted on the MCU board 100 .
The MCU board 100 is mounted with connectors 113A and 113B for the thermistor 42 that measures the heater temperature. The connector 113A is for positive electrodes, and the connector 113B is for negative electrodes. Note that the wires connecting thermistor 41 to connectors 114A and 114B are omitted in FIG. 3B.
The MCU board 100 is mounted with connectors 114A and 114B for the thermistor 41 used to detect puffs (that is, inhalation). The connector 114A is for the positive electrode, and the connector 114B is for the negative electrode.

The MCU board 100 is mounted with connectors 115A and 115B for thermistors used to detect the temperature of the outer case 20B. The connector 115A is for positive electrodes, and the connector 115B is for negative electrodes.
The MCU board 100 uses a flexible board 600 on which wiring patterns used for communication with circuit elements mounted on boards other than the MCU board 100 are formed. The flexible substrate 600 also includes power traces.

FIG. 4 is a diagram for explaining circuit elements appearing on the power supply line and voltages appearing between the circuit elements.
In the case of the aerosol generator 1 according to Embodiment 1, the power supply line of the battery 50 is branched into two systems. One of the two systems is connected to the BAT terminal of the charging IC 103 , and the other system is connected to the VBAT terminal of the fuel gauge IC 201 and the VIN terminal of the boost DC/DC circuit 202 . By branching the power supply line into two systems, the large current supplied to the heater does not pass through the charging IC 103 . Therefore, the charging IC 103 does not become bulky.

The fuel gauge IC 201 operates by being supplied with the system power supply _Vcc33 , and monitors the battery voltage VBAT and the like supplied to the _BAT terminal.
A boost DC/DC circuit 202 boosts the battery voltage V _BAT to generate a boosted voltage V _boost to be applied to the heater. However, power supply to the heater is realized by ON control of a MOSFET (not shown) connected to the output terminal of the boost DC/DC circuit 202 .
Incidentally, the fuel gauge IC 201 and the step-up DC/DC circuit 202 are mounted on the USB connector board 200 .

The charging IC 103 generates a voltage Vcc from the battery voltage V _BAT supplied from the battery 50 and the BUS voltage V _USB supplied from the external power supply, and supplies the voltage Vcc to the step-up/step-down DC/DC circuit 105 .
The step-up/step-down DC/DC circuit 105 generates a system power supply _{Vcc33_0} of 3.3V from the voltage Vcc, and supplies it to the load switch 106 and the like. The system power supply _{Vcc33_0} continues to be supplied even while the system is stopped (while the MCU 101 is stopped).

The load switch 106 supplies the 3.3V system power supply _Vcc33 to the MCU 101, the load switch 109, and the like only when the MCU 101 (see FIG. 3A) and the like are operated. This system power supply _Vcc33 is also supplied to the fuel gauge IC201.
The load switch 109 outputs the 3.3V system power supply V _{CC33_SLP} to the power supply line only when performing temperature measurement with three thermistors. The three thermistors here refer to the thermistor 41 used for puff detection, the thermistor 42 used for measuring the temperature of the heater, and the thermistor used for measuring the temperature of the outer case 20B.
The charging IC 103 supplies the 5V power generated from the battery voltage _VBAT as _Vcc5 to the LED 302 (see FIG. 2B). The LED 302 may be supplied with the BUS voltage _VUSB .

FIG. 5 is a diagram illustrating an internal configuration example of the charging IC 103 used in the first embodiment.
The charging IC 103 shown in FIG. 5 is provided with an I2C interface 103A, a logic circuit 103B, a gate driver 103C, a low dropout regulator (hereinafter referred to as "LDO") 103D, and four MOSFETs Q1 to Q4. there is
I2C interface 103A is used for I2C communication with MCU 101 on the same board.

A battery 50 is connected to the BAT terminal of the charging IC 103 through a power supply line. Therefore, the battery voltage V _BAT is supplied to the BAT terminal of the charging IC 103 except during charging.
A USB connector 21 is connected to the VBUS terminal of the charging IC 103 through a load switch 104 (see FIG. 4). The load switch 104 is controlled to the ON state only when the reception of the BUS voltage _VUSB , which is the external power supply, is detected, and is controlled to the OFF state when the reception of the BUS voltage _VUSB is not detected. The MCU 101 may switch the load switch 104 between the ON state and the OFF state.

The charging IC 103 supports five power feeding modes.
The five power supply modes are charging mode, power supply mode with BUS voltage _VUSB , power supply mode with both BUS voltage _VUSB and battery voltage _VBAT , power supply mode with battery voltage _VBAT , _OTG (=On -The-Go) function.

FIG. 6A is a diagram illustrating power supply paths of the charging IC 103 operating in the charging mode.
The charging mode is executed when a low level signal is applied from the MCU 101 to the CE terminal while the USB cable is connected to the USB connector 21 (see FIG. 1B).
In the charging mode, FETQ1 and Q4 are controlled to be ON, FETQ3 is controlled to be OFF, and FETQ2 is PWM (=Pulse Width Modulation) controlled. By controlling the FETs Q1 to Q4 in this manner, the charging IC 103 operates as a step-down regulator (converter).
The BUS voltage _VUSB applied to the VBUS terminal is a power supply of approximately 5V.

ON or OFF of the FETQ2 is controlled by the gate driver 103C. The switching of the gate driver 103C is performed based on the charging current and charging voltage that the logic circuit 103B acquires from terminals and wirings (not shown). The BUS voltage V _USB is stepped down to a voltage suitable for charging the battery 50 by switching the FET Q2.
The voltage _Vcc output from the SW terminal of the charging IC 103 via the inductance is re-input to the SYS terminal and then output (charged) from the BAT terminal to the battery 50 (see FIG. 2A).

FIG. 6B is a diagram illustrating a power supply path of charging IC 103 operating in a power supply mode using BUS voltage _VUSB .
This power supply mode is executed when a high level signal is applied from the MCU 101 to the CE terminal in a state in which a USB cable is connected to the USB connector 21 (see FIG. 1B) and an abnormality has occurred in the battery 50. be. The term "abnormality of the battery 50" as used herein refers to a state in which discharge of the battery 50 is prohibited due to being in an over-discharged state, a deep-discharged state, or the like.
When a high level signal is applied to the CE terminal, PWM control of FETQ2 is stopped.

In this power feeding mode, the FETs Q1 and Q2 are controlled to be on, and the FETs Q3 and Q4 are controlled to be off.
Since the FETs Q1 and Q2 are turned on and the FET Q3 is turned off, the system power supply Vcc appearing at the SW terminal becomes equal to the BUS voltage _VUSB .
Since the FET Q4 is turned off, the battery 50 is disconnected from the charging IC 103.

FIG. 6C is a diagram illustrating a power supply path of charging IC 103 operating in a power supply mode using both USB voltage V _USB and battery voltage V _BAT .
This power feeding mode is executed when a high-level signal is applied from the MCU 101 to the CE terminal in a state in which the USB cable is connected to the USB connector 21 (see FIG. 1B) and the battery 50 is normal. .
In this power supply mode, the FETs Q1 and Q4 are controlled to be on, the FET Q3 is controlled to be off, and the FET Q2 is PWM controlled.

PWM control in this power supply mode is performed so that the voltage at the SYS terminal is the same as the battery voltage V _BAT . Therefore, the buck-boost DC/DC circuit 105 (see FIG. 4) is supplied with power derived from the BUS voltage _VUSB and power derived from the battery 50 in a combined state.
In this power supply mode, the voltage of the SYS terminal and the battery voltage V _BAT are the same, so the discharge of the battery 50 is also continued.

FIG. 6D is a diagram illustrating a power supply path of charging IC 103 operating in a power supply mode based on battery voltage _VBAT .
This power feeding mode is executed when a high level signal is applied from the MCU 101 to the CE terminal while the USB cable is not connected to the USB connector 21 (see FIG. 1B).
In this power supply mode, the FET Q4 is turned on and the FETs Q1, Q2 and Q3 are turned off.

In this power supply mode, the voltage _Vcc output from the SYS terminal is equal to the voltage value of the battery voltage _VBAT . Therefore, when the voltage value of the battery voltage V _BAT drops below that at full charge, the voltage V _cc also drops.
In this feeding mode, the voltage _Vcc at the SYS terminal fluctuates.
The line between the SW terminal and the VBUS terminal is blocked by the parasitic diode of the FETQ1. Therefore, the voltage of 5V is not generated by the reverse power flow (OTG function) of the charging IC 103 .

FIG. 6E is a diagram illustrating power supply paths of the charging IC 103 operating in the power supply mode by the OTG function of the battery voltage _VBAT .
This power supply mode is executed when the MCU 101 applies a high-level signal to the CE terminal while the I2C interface 103A is instructed by the MCU 101 to use the OTG function through I2C communication.
In this power supply mode, the FETs Q1 and Q4 are controlled to be on, the FET Q2 is controlled to be off, and the FET Q3 is PWM controlled. By controlling the FETs Q1 to Q4 in this manner, the charging IC 103 operates as a boost regulator (converter).

Also in this power supply mode, the voltage _Vcc output from the SYS terminal is the same as the voltage value of the battery voltage _VBAT . Therefore, when the voltage value of the battery voltage V _BAT drops below that at full charge, the voltage V _cc also drops.
In this power feeding mode, a current flows through the GND terminal via the inductance while the FET Q3 is on-controlled. After that, when the FET Q3 is turned off, a back electromotive voltage is generated in the inductance. Due to this back electromotive force, a voltage obtained by boosting the voltage _Vcc to 5V appears at the VBUS terminal. A voltage of 5V is output to enable the use of the LED 302 (see FIG. 2B). In order for the LED 302 to emit light, the transistor must be closed inside the MCU 101 . In other words, the LED 302 is connected to ground through a transistor provided inside the MCU 101 .

As described above, in each operation mode, the case where the CE terminal of the charging IC 103 operates in negative logic has been described, but the charging IC 103 in which the CE terminal operates in positive logic may be used instead.
In this case, for example, in order to operate the charging IC 103 in the charging mode, a high level signal should be applied from the MCU 101 to the CE terminal.

<Configuration of USB connector board>
FIG. 7A is a diagram illustrating a configuration example of the front side of the USB connector board 200 used in Embodiment 1. FIG.
FIG. 7B is a diagram illustrating a configuration example of the back side of the USB connector board 200 used in the first embodiment.
The front and back surfaces in FIGS. 7A and 7B are used only in the description of the first embodiment.
The USB connector board 200 is a board that handles higher voltage than other boards.

The USB connector board 200 is also a double-sided mounting board.
A USB connector 21 is mounted on the USB connector board 200 . The USB connector 21 in this embodiment is used to receive power from an external power supply via a USB cable.
In addition, the USB connector board 200 is mounted with a fuel gauge IC 201 for collecting information on the battery 50 (see FIG. 2A) and a boost DC/DC circuit 202 .

The fuel gauge IC 201 has a VBAT terminal to which the power supply line of the battery 50 is connected. However, the fuel gauge IC 201 operates by receiving a system power supply _{Vcc 33} of 3.3 V from the load switch 106 (see FIG. 4), and receives information such as the remaining capacity of the battery 50 based on the input to the VBAT terminal. get.
FIG. 8 is a diagram for explaining the function of the fuel gauge IC 201. As shown in FIG. FIG. 8 shows a digital calculation unit 201A, a register 201B, and an I2C interface 201C as representative components of the fuel gauge IC 201. As shown in FIG. Although not shown in FIG. 8, the fuel gauge IC 201 has a terminal such as a VBAT terminal to which information of the battery 50 is input.

Digital operation unit 201A calculates remaining capacity (Ah) based on battery temperature T _BAT (°C), battery voltage V _BAT (V), and battery current I _BAT (A), and stores it in register 201B. The digital calculator 201A also calculates the full charge capacity (Ah) at the current time. Note that the battery temperature T _BAT (°C) is measured by the thermistor 53 (see FIG. 2A).

The digital calculation unit 201A has a function of calculating a state of charge (SOC) when the fully charged state at the current time is 100% and the fully discharged state is 0%. The calculated SOC is also stored in register 201B.
The digital operation unit 201A also has a function of calculating SOH (=State of Health), which is an index of the state of health and deterioration of the battery 50 . The calculated SOH is also stored in register 201B. Note that the SOH may be expressed as a ratio of the full charge capacity at the current time to the full charge capacity when new. The SOH when new is 100%. Instead of the full charge capacity, the ratio of the internal resistance of the battery 50 at the current time to the internal resistance of the battery 50 when new may be used as the SOH.
The I2C interface 201C is used for serial communication with the MCU 101 mounted on the adjacent MCU board 100 .

Returning to the description of FIGS. 7A and 7B.
In addition, a protection IC 203 for the battery 50 is mounted on the USB connector board 200 . The protection IC 203 monitors overcharging, overdischarging, and overcurrent during charging or discharging of the battery 50, and protects the battery 50 when these are detected.
Connectors 204A and 204B are mounted on the USB connector board 200 to be connected to the negative electrode 51 and the positive electrode 52 (see FIG. 2B) used to extract power from the battery 50, respectively. The connector 204A is for the positive electrode and the connector 204B is for the negative electrode.
A connector 205 for the thermistor 53 used for battery temperature measurement is also mounted on the USB connector board 200 .

Also, heater connectors 206A and 206B are mounted on the USB connector board 200 . The heater connector 206A is for the positive electrode, and the heater connector 206B is for the negative electrode.
In addition, an overvoltage protection IC is also mounted on the USB connector board 200 . An overvoltage protection IC is located between the USB connector 21 (see FIG. 1B) and the load switch 104 and is used to monitor the power supplied from the USB connector 21 . The overvoltage protection IC cuts off the electrical connection between the USB connector 21 and the load switch 104 when overcurrent and/or overvoltage is detected.

<Structure of LED and Bluetooth board and Hall IC board>
FIG. 9 is a diagram illustrating a configuration example of the LED and Bluetooth board 300 and the Hall IC board 400 used in the first embodiment.
A tactile switch 301 and an LED 302 are mounted on the LED and Bluetooth board 300 . The tactile switch 301 is used as a so-called power button. In the case of a long press operation with the external panel 10 removed, the tactile switch 301 also functions as a reset button for the MCU 101 .
The number of LEDs 302 in Embodiment 1 is eight. In FIG. 9, the LEDs 302 are arranged in a row on the LED and Bluetooth board 300 . The number of LEDs 302 and the arrangement of the LEDs and the Bluetooth board 300 can be changed arbitrarily.

A voltage _Vcc5 of 5 V is applied to the LED 302 from the charging IC 103 (see FIG. 4) or the USB connector 21 . Various information is notified to the user by a combination of light emission of the eight LEDs 302 . For example, the remaining capacity of the battery 50 is displayed. Also, for example, it is notified that a reset will be executed. Reset is executed when the push button 23 (that is, the tactile switch 301) is pressed long while the external panel 10 is removed from the main body housing 20. FIG.
Light emission of the LED 302 is PWM-controlled by the MCU 101 (see FIG. 3A).
Since the LED and Bluetooth board 300 to which the voltage _Vcc5 of 5V is applied is provided separately from the MCU board 100 and the USB connector board 200, wiring and heat do not concentrate on one board. A driver may be used to control the light emission of the LED 302 at a higher level.

In addition, a Bluetooth IC 303 is mounted on the LED and Bluetooth board 300 . The Bluetooth IC 303 executes communication with paired external devices. Pairing is performed on the condition that the tactile switch 301 is pressed while the shutter 30 is closed. The Bluetooth IC 303 is supplied with a 3.3V system power supply _Vcc33 .
UART communication is used for communication between the Bluetooth IC 303 and the MCU 101 .

The LED and Bluetooth board 300 is mounted with a Hall IC 304 used to detect attachment and detachment of the external panel 10 to the main body housing 20, and a single Schmidt trigger inverter 305 that stabilizes the output of the Hall IC 304 with hysteresis characteristics. . The Hall IC 304 and the single Schmitt trigger inverter 305 are also supplied with the 3.3V system power supply _Vcc33 . Single Schmidt trigger inverter 305 may be omitted.
A Hall IC 401 for detecting opening and closing of the shutter 30 is mounted on the Hall IC substrate 400 . The Hall IC 401 is also supplied with the 3.3V system power _Vcc33 . Hall IC substrate 400 is also connected to MCU 101 through flexible substrate 600 .

<Communication protocol>
FIG. 10 is a diagram illustrating an example of a communication protocol employed by the circuit unit 1000 (see FIG. 2B). Specifically, FIG. 10 illustrates communication protocols that the MCU 101 uses to communicate with other ICs.
MCU 101 in Embodiment 1 communicates with other ICs using a plurality of communication protocols. Specifically, I2C communication and UART communication are used.
In the case of the first embodiment, there are two communication lines corresponding to I2C communication, and one communication line corresponding to UART communication.

In the case of the first embodiment, the two communication lines corresponding to the I2C communication are a first communication line used for communication with an IC on the same substrate as the MCU 101 and a communication line used for communication with an IC on a substrate different from the MCU 101. A second communication line. There is no electrical contact between the first communication line and the second communication line. That is, the communication on the first communication line and the communication on the second communication line are independent.
One communication line corresponding to UART communication is the third communication line.
In FIG. 10, the first communication line is denoted as "I2C1" and the second communication line is denoted as "I2C2".
The first communication line is mounted on the MCU board 100 as a wiring pattern. In Embodiment 1, the MCU board 100 is also called a first board.

In the case of FIG. 10, the MCU 101 is provided with a first communication terminal 101A for the first communication line and a second communication terminal 101B for the second communication line.
MCU 101 is connected to EEPROM 102 and charging IC 103 through a first communication line.
In Embodiment 1, the charging IC 103 is also called a first IC, and the EEPROM 102 is also called a third IC.
In the case of FIG. 10, the charging IC 103 is provided with a third communication terminal 103A1 for the first communication line, and the EEPROM 102 is provided with a fifth communication terminal 102A for the first communication line.

The second communication line is included in flexible substrate 600 (see FIG. 7B) that connects MCU substrate 100 and USB connector substrate 200 .
In the case of the first embodiment, the board surface of the MCU board 100 and the board surface of the USB connector board 200 are installed substantially parallel. This relationship between the substrates can also be seen, for example, from FIGS. 2A, 2B and 3A. In other words, the USB connector board 200 is located next to the MCU board 100 .

The distance of the flexible board 600 connecting the MCU board 100 and the USB connector board 200 is shorter than the distance of the flexible board 600 connecting the MCU board 100 and the LED and Bluetooth board 300 . The distance between the MCU board 100 and the flexible board 600 connecting the LED and Bluetooth board 300 is shorter than the distance between the flexible board 600 connecting the MCU board 100 and the Hall IC board 400 . This installation relationship can be seen from FIG. 9, for example.

In Embodiment 1, the USB connector board 200 is also called a second board.
The MCU 101 is connected to the fuel gauge IC 201 through the second communication line.
In Embodiment 1, the fuel gauge IC 201 is also called a second IC.
In the case of FIG. 10, the fuel gauge IC 201 is provided with a fourth communication terminal 201A1 for the second communication line.
In Embodiment 1, the LED and Bluetooth board 300 is also called a third board.

A third communication line for UART communication is included in the flexible board 600 (see FIG. 7A) connecting the MCU board 100 and the LED and Bluetooth board 300 .
MCU 101 is connected to Bluetooth IC 303 through a third communication line.
In Embodiment 1, the Bluetooth IC 303 is also called a fourth IC.
In the case of FIG. 10, the MCU 101 is provided with a sixth communication terminal 101C for the third communication line. On the other hand, the Bluetooth IC 303 is provided with a seventh communication terminal 303A for the third communication line.

I2C communication is capable of one-to-many communication. That is, I2C communication is a bus connection. Therefore, in the case of I2C communication, a communication destination is specified by an address.
FIG. 11 is a diagram illustrating an image of I2C communication. FIG. 11 illustrates communication between the MCU 101 and the fuel gauge IC 201 . That is, FIG. 11 shows an example of communication using the second communication line. As shown in FIG. 11, I2C communication is executed in the order of address transmission, command transmission, and data transmission. In the I2C communication shown in FIG. 11, command transmission and data transmission are in multi-byte format, but they may be in single-byte format.
The number of signal lines for both the first communication line and the second communication line corresponding to I2C communication is two, a clock line SCL for serial communication and a data line SDA for serial communication, regardless of the number of connected ICs. is. The speed of I2C communication is 0.1 to 1 Mbps. The clock line SCL is used for transmitting and receiving clock pulses and ACKs that give synchronization timing, and the data line SDA is used for transmitting and receiving the above-described addresses, commands, and data.

On the other hand, UART communication is one-to-one connection and asynchronous communication that does not use a clock.
In the case of unidirectional communication, the number of signal lines for UART communication is one, but in the case of bidirectional communication, the number of signal lines for UART communication is two. In the example of FIG. 10, three signal lines including the reset line are used.
The speed of UART communication is 0.1 to 115 kbps. That is, the speed of UART communication is slower than that of I2C communication.
However, UART communication is capable of long-distance communication. Therefore, in Embodiment 1, UART communication is used for communication between the MCU 101 and the LED and the Bluetooth board 300 where the distance of the flexible board 600 is long.

<Operating mode>
FIG. 12 is a diagram for explaining operation modes prepared in the aerosol generating device 1 used in Embodiment 1 and transition conditions between the operation modes. In the following description, transition between operation modes may also be referred to as transition mode.
The aerosol generator 1 used in the embodiment has nine operation modes. There are nine modes: charging mode M1, sleep mode M2, error mode M3, permanent error mode M4, Bluetooth pairing mode M5, active mode M6, initialization mode M7, vaping mode M8, and vaping end mode M9.
Each operation mode will be described in order below.

・Charging mode M1
The charge mode M1 is a mode in which the battery 50 is charged using the BUS voltage _VUSB .
In the charge mode M1, when the battery voltage V _BAT of the battery 50 (see FIG. 2A) is extremely low, deep discharge or over discharge may be detected.

・Sleep mode M2
Sleep mode M2 is a state in which most of the functions cannot be used except detection of the closed state of the shutter 30 (see FIG. 1A) and monitoring of the battery 50 by the fuel gauge IC201. Therefore, the sleep mode M2 consumes less power than the other modes.
However, the supply of the system power supply _{Vcc33_0} to some flip-flops is continued. As a result, the value of the flip-flop that continues to be powered is held.
The sleep mode M2 is entered in the charging mode M1 when the USB is removed or charging is completed. Conversely, the charge mode M1 is entered when the USB is connected in the sleep mode M2. In addition, sleep mode M2 can also transition to Bluetooth pairing mode M5 and active mode M6. Note that the charging mode M1 may be entered even when the USB is connected in a mode other than the sleep mode M2.

・Error mode M3
The error mode M3 is a mode for temporarily saving when a recoverable error such as abnormal temperature occurs.
When it shifts to the error mode M3, an error is notified, and the sleep mode M2 is restored after a certain period of time has passed or after a predetermined condition for canceling the error has been satisfied.
Incidentally, the error mode M3 also shifts from the charging mode M1, the active mode M6, the vaping initialization mode M7, and the vaping mode M8.

・Permanent error mode M4
The permanent error mode M4 is a mode that prohibits transition to other modes when an unrecoverable error such as deep discharge, battery life, or short circuit occurs. Also in FIG. 12, there are no arrows from the permanent error mode M4 to other modes.

・Bluetooth pairing mode M5
The Bluetooth pairing mode M5 is a mode for executing pairing with an external device by Bluetooth. Paired external devices are recorded in the whitelist. That is, they are bonded.
The Bluetooth pairing mode M5 is entered by operating the push button 23 (see FIG. 1D) while the shutter 30 is closed in the sleep mode M2.
If bonding is successful or unsuccessful in Bluetooth pairing mode M5, it transitions to sleep mode M2.

・Active mode M6
Active mode M6 is a mode in which most functions except heating are available.
The active mode M6 is entered when the shutter 30 is opened in the sleep mode M2. On the contrary, when the shutter 30 is closed in the active mode M6 or when a certain period of time elapses, the mode shifts to the sleep mode M2.

・Vaping initialization mode M7
The vaping initialization mode M7 is a mode in which initialization and the like are performed when heating the stick is started.
The initialization mode M7 is entered by operating the push button 23 in the active mode M6.
If an error occurs during initialization, the initialization mode M7 is shifted to the error mode M3.

・Vaping mode M8
Vaping mode M8 is a mode for heating tobacco sticks. The heater is energized alternately for generating heat and for obtaining the resistance value. Note that the temperature profile of the heater changes over time.
When the initial setting is completed in the initialization mode M7, the vaping mode M8 is entered. If an error occurs during vaping mode M8, the mode shifts to error mode M3.

・Vaping end mode M9
The vaping end mode M9 is a mode for executing heating end processing.
The vaping end mode M9 is entered in the vaping mode M8 when the time or the number of puffs reaches the upper limit, when the shutter 30 is closed, or when the USB is connected. When the USB is connected to shift to the vaping end mode M9, the charging mode M1 may be subsequently shifted to.
Note that when the end of heating is detected in the vaping end mode M9, the mode shifts to the active mode M6.

<Contents of communication by operation mode>
13A and 13B are charts for explaining the contents of communication for each operation mode according to the first embodiment. FIG.
FIG. 13 illustrates the contents of communication for a total of 11 modes, 9 operating modes and 2 transition modes from the sleep mode.

FIG. 13 shows communication on the three communication lines described above, that is, the first and second communication lines for I2C communication and the third communication line for UART communication.
MCU 101, EEPROM 102, and charging IC 103 are connected to the first communication line.
The MCU 101 and the fuel gauge IC 201 are connected to the second communication line.
The MCU 101 and the Bluetooth IC 303 are connected to the third communication line.

・Charging mode M1
The MCU 101 receives charging information from the charging IC 103 through the first communication line. Meanwhile, the MCU 101 transmits a command to turn off the OTG function to the charging IC 103 through the first communication line. That is, the MCU 101 instructs the charging IC 103 to stop the function of generating a voltage of 5V from the battery voltage _VBAT . This allows the LED 302 to be supplied with the BUS voltage _{V_USB} .
The MCU 101 also transmits commands to the EEPROM 102 through the first communication line. For example, the MCU 101 transmits a command to the EEPROM 102 to store the charging start date and time and the remaining battery level at that time. Also, for example, the MCU 101 transmits a command to the EEPROM 102 to store the charging end date and time and the remaining battery level at that time.

In the case of the present embodiment, the MCU 101 receives battery information from the fuel gauge IC 201 through the second communication line at intervals of one second. Note that the one-second period is an example.
FIG. 14 is a diagram illustrating communication during the charging mode M1. Note that the initial state of the processing operation shown in FIG. 14 is the sleep mode M2.
In the sleep mode M2, when the voltage input to the PA9 terminal of the MCU 101 changes to H level, the MCU 101 detects the USB connection and changes the operation mode to the charge mode M1. A voltage obtained by dividing the BUS voltage VUSB is applied to the _PA9 terminal. By connecting one end of the voltage dividing circuit to the ground, the potential of the PA9 terminal becomes equal to the ground potential when the USB is not connected.

When the charging mode M1 starts, the MCU 101 sends an OTG off command to the charging IC 103 on the same board through the first communication line (that is, the first system of I2C).
Next, the MCU 101 changes the voltage output to the PC9 terminal to H level, and turns on the load switch 104 (see FIG. 4). When the load switch 104 is turned on, the power supply of the BUS voltage _VUSB to the charging IC 103 is started.
Note that the MCU 101 may turn on the load switch 104 by setting the voltage output to the PC9 terminal to L level or indefinite. In this case, the ON terminal of the load switch 104 is supplied with a voltage obtained by dividing the BUS voltage _VUSB . That is, if the voltage output to the PC9 terminal is L level or indefinite, the ON terminal of the load switch 104 becomes H level by the voltage obtained by dividing the BUS voltage _VUSB .
However, charging of the battery 50 by the charging IC 103 does not start even if the supply of the BUS voltage _VUSB starts. Charging of the battery 50 is started when the MCU 101 notifies the charging IC 103 of a charging command. Note that the first communication line is not used for this notification.

Note that when the charging mode M1 starts, the MCU 101 transmits/receives I2C commands to/from the fuel gauge IC 201 at intervals of one second through the second communication line (that is, the second I2C system).
Communication between the MCU 101 and the fuel gauge 201 using this second communication line continues during the charging mode M1. That is, MCU 101 can concentrate on communication with fuel gauge IC 201 without being interrupted by communication with EEPROM 102 and charging IC 103 .
In other words, the MCU 101 can communicate with the EEPROM 102 and the charging IC 103 by communicating with the fuel gauge IC 201 .

After controlling the load switch 104 to the ON state, the MCU 101 writes charging start information into the EEPROM 102 through the first communication line. Specifically, the charging start date and time and the remaining battery capacity at that time are recorded. At this point, charging has not yet started.
After that, MCU 101 transmits a charging command to charging IC 103 . This charging command is executed by changing the potential of the PB3 terminal of the MCU 101 to L level. A change in potential appearing at the PB3 terminal is applied to the CE terminal (see FIG. 5) of the charging IC 103 .
When charging is started by receiving a charging command, the MCU 101 and the charging IC 103 transmit and receive I2C commands at regular time intervals (for example, x second intervals).

When the charging IC 103 notifies the MCU 101 of the completion of charging, the MCU 101 instructs the EEPROM 102 to write charging completion information. Also, the MCU 101 notifies the charging IC 103 of a charging stop command by changing the potential of the PB3 terminal to H level. A charging stop command to the charging IC 103 is executed by changing the potential of the PB3 terminal to H level.
After that, when the voltage input to the PA9 terminal changes to L level, the MCU 101 detects removal of the USB. Subsequently, the MCU 101 changes the voltage output to the PC9 terminal to the L level, and controls the load switch 104 to be off. When the load switch 104 is controlled to be in an off state, the charging IC 103 cannot be supplied with the BUS voltage _VUSB .

During charging mode M1, MCU 101 communicates with each of EEPROM 102 and charging IC 103 individually. That is, the timing at which MCU 101 and EEPROM 102 communicate does not overlap with the timing at which MCU 101 communicates with charging IC 103 . More specifically, the MCU 101 and the EEPROM 102 communicate with each other at the beginning (before charging starts) and the end (after charging is completed) in the charging mode M1. The timing for communication between the MCU 101 and the charging IC 103 is the middle period (during charging) in the charging mode M1.
Communication between the MCU 101 and the EEPROM 102, communication of the OTG off command from the MCU 101 to the charging IC 103, and communication of the completion of charging from the charging IC 103 to the MCU 101 are executed when each event occurs. In other words, communication on the first communication line is performed aperiodically.
On the other hand, communication on the second communication line is performed periodically during the charging mode M1.

As shown in FIG. 14, in charging mode M1, the timing of communication on the first communication line overlaps with the timing of communication on the second communication line.
However, as described above, since the first communication line and the second communication line are different communication lines, it is possible to execute communication on other communication lines without interfering.
Also, the second communication line is a communication line that connects the USB connector board 200 different from the MCU board 100 on which the MCU 101 is mounted. is. Therefore, it becomes possible to collect the information of the battery 50 in a cycle of one second. In other words, the communication frequency of the second communication line is higher than the communication frequency of the first communication line.
It is common technical knowledge that the I2C communication used for the second communication line is not suitable for long-distance communication across a plurality of boards. However, if UART communication or the like suitable for long-distance communication is used, the frequency of communication with the fuel gauge IC 201 decreases, making it difficult for the MCU 101 to acquire the latest state of the battery 50 . Therefore, the USB connector board 200 on which the fuel gauge IC 201 is mounted is positioned next to the MCU board 100 . As a result, high-frequency communication by I2C communication is possible even with the fuel gauge IC 201 mounted on another substrate.

Returning to the description of FIG.
In parallel with communication using these first and second communication lines, the MCU 101 communicates with the LED on which the Bluetooth IC 303 is mounted and the Bluetooth board 300 through the third communication line.
The third communication line here uses UART communication with a long communication distance as a communication protocol. Incidentally, the MCU 101 sends charging information to the Bluetooth IC 303 . This charging information can be transmitted to the paired external device.

・Sleep mode M2
MCU 101 does not communicate with EEPROM 102 , charging IC 103 , or Bluetooth IC 303 .
However, in the transition period from the active mode M6 to the sleep mode M2, the MCU 101 transmits a command to turn off the OTG function to the charging IC 103 through the first communication line. The MCU 101 also commands the Bluetooth IC 303 to sleep through the third communication line. The transition from active mode M6 to sleep mode M2 is also one of two transition modes.

On the other hand, in the transition period from the sleep mode M2 to the active mode M6, the MCU 101 transmits a command to turn on the OTG function to the charging IC 103 through the first communication line. Also, the MCU 101 instructs the Bluetooth IC 303 to start up through the third communication line.
The transition period here is an example of a first condition in which communication is performed only with the charging IC 103 as the first IC. The transition from sleep mode M2 to active mode M6 is also the other of the two transition modes.

・Error mode M3 and permanent error mode M4
The MCU 101 stores the error information in the EEPROM 102 through the first communication line.
Also, the MCU 101 receives battery information from the fuel gauge IC 201 through the second communication line at intervals of one second.
Also, the MCU 101 sends error information to the Bluetooth IC 303 through the third communication line.
The error mode M3 and the permanent error mode M4 are examples of second conditions for communicating with the EEPROM 102 as the third IC.

・Bluetooth pairing mode M5
The MCU 101 receives information on the paired terminal from the Bluetooth IC 303 through the third communication line.
After that, the MCU 101 stores the paired terminals in the EEPROM 102 through the first communication line.
Also, the MCU 101 receives battery information from the fuel gauge IC 201 through the second communication line at intervals of one second.
The Bluetooth pairing mode M5 here is also an example of the second condition for communicating with the EEPROM 102 as the third IC.

・Active mode M6
The MCU 101 receives battery information from the fuel gauge IC 201 through the second communication line at intervals of one second. Note that the MCU 101 in active mode M6 communicates only with the fuel gauge IC 201 .

・Vaping initialization mode M7
The MCU 101 stores the heating start time in the EEPROM 102 through the first communication line.
Also, the MCU 101 receives battery information from the fuel gauge IC 201 through the second communication line at intervals of one second.
The initialization mode M7 here is also an example of the second condition for communicating with the EEPROM 102 as the third IC.

・Vaping mode M8
The MCU 101 stores the puff timing in the EEPROM 102 through the first communication line. The puff timing is detected by the thermistor 41 used for puff detection.
Also, the MCU 101 receives battery information from the fuel gauge IC 201 through the second communication line at intervals of one second.
The vaping mode M8 here is also an example of the second condition for communicating with the EEPROM 102 as the third IC.

・Vaping end mode M9
The MCU 101 stores the vaping mode time in the EEPROM 102 through the first communication line. Note that the heating end time may be stored.
Also, the MCU 101 receives battery information from the fuel gauge IC 201 through the second communication line at intervals of one second.
Also, the MCU 101 sends suction information to the Bluetooth IC 303 through the third communication line.
The vaping end mode M9 here is also an example of the second condition for communicating with the EEPROM 102 as the third IC.

- Summary The circuit unit 1000 of the aerosol generating device 1 used in Embodiment 1 provides two communication lines for I2C communication between the MCU 101 and other ICs. As a result, even if the number of ICs with which the MCU 101 communicates increases, high-frequency and low-delay communication can be realized with a plurality of ICs. As a result, the control accuracy and functionality of the MCU 101 are improved.

The two communication lines here include a first communication line mounted on the MCU board 100 and a second communication line connecting the MCU board 100 and the USB connector board 200 .
Since two systems for I2C communication are provided for each substrate to be communicated with, communication lines do not concentrate on one substrate, and complication and high density of wiring patterns are suppressed. As a result, the manufacturing cost of the aerosol generator 1 can be reduced.

Further, since I2C communication is adopted for communication with the USB connector board 200 adjacent to the MCU board 100, high-speed communication between the MCU 101 and the fuel gauge IC 201 can be realized. In other words, the MCU 101 can acquire the state of the battery 50 with a short delay.
On the other hand, by adopting UART communication for communication with the LED and the Bluetooth board 300 whose communication distance is longer than that of the USB connector board 200 by the flexible board 600, reliable communication is realized even with the Bluetooth IC 303 having a long communication distance.

Also, since the MCU 101 communicates with each of the plurality of ICs sharing the first communication line at different timings, the accuracy of communication between the MCU 101 and each IC is also improved.
Note that the charging mode M1 is a mode in which the MCU 101 communicates with both the EEPROM 102 and the charging IC 103 through the first communication line.
Sleep mode M2 is a mode in which MCU 101 does not communicate with both EEPROM 102 and charging IC 103 through the first communication line. However, the MCU 101 communicates with the fuel gauge IC 201 through the second communication line.

In the sleep mode M2, the transition period from the active mode M6 and the transition period to the active mode M6 are modes in which the MCU 101 communicates only with the charging IC 103 through the first communication line.
Active mode M6 is a mode in which MCU 101 does not communicate with both EEPROM 102 and charging IC 103 through the first communication line.
The remaining operating modes, namely error mode M3, permanent error mode M4, Bluetooth pairing mode M5, initialization mode M7, vaping mode M8, and vaping end mode M9, MCU 101 communicates only with EEPROM 102 through the first communication line. mode.

<Embodiment 2>
The aerosol generator 1 (see FIG. 1A) used in Embodiment 2 differs from Embodiment 1 in part of the communication during the operation mode.
15A and 15B are charts for explaining the contents of communication for each operation mode according to the second embodiment.
The aerosol generator 1 used in the second embodiment differs from the first embodiment in that it does not communicate with the fuel gauge IC 201 through the second communication line in the error mode M3 and the permanent error mode M4.

<Embodiment 3>
The aerosol generator 1 (see FIG. 1A) used in Embodiment 3 differs from Embodiment 1 in part of the communication during the operation mode.
16A and 16B are charts for explaining the contents of communication for each operation mode according to the third embodiment.
The aerosol generator 1 used in Embodiment 3 differs from Embodiment 1 in that it communicates with the fuel gauge IC 201 through the second communication line in all operations including the sleep mode M2.

<Other embodiments>
(1) Although the embodiments of the present invention have been described above, the technical scope of the present invention is not limited to the scope described in the above-described embodiments. It is clear from the scope of claims that the technical scope of the present invention includes various modifications and improvements to the above-described embodiment.

(2) In the above-described embodiments, I2C communication is used as the communication protocol for the first communication line and the second communication line. good too.
FIG. 17 is a diagram for explaining a connection form of SPI communication, which is one form of serial communication. In the case of SPI communication, as signal lines, a clock line, a master output line, a master input line, and slave selection lines for the number of slaves are required. For example, if there is one slave, there are four signal lines, and if there are three slaves, there are six signal lines.
SPI communication is capable of communication at a speed of 1 to several Mbps, but is not suitable for long-distance communication. Therefore, SPI communication can be adopted as an alternative configuration for I2C communication.

(3) In the above-described embodiment, the MCU 101 communicates with two ICs on the same substrate. good too.
Also, although the MCU 101 communicates with one IC on the USB connector board 200 , it may communicate with a plurality of ICs on the USB connector board 200 . The same is true for communication with the LEDs and Bluetooth board 300 .

(4) In the above-described embodiment, the USB connector board 200 is the only other board that uses I2C communication for communication with the MCU 101. However, if the communication distance with the MCU board 100 is short, other boards and You may employ|adopt I2C communication for communication of this.

(5) In the above-described embodiment, the aerosol generator 1 is assumed to be a heated cigarette, but the configuration of the circuit unit 1000 described above may be applied to electronic cigarettes.
FIG. 18 is a diagram illustrating an example of the external configuration of an aerosol generating device 1A compatible with electronic cigarettes.
The aerosol generator 1A is a tool for generating flavored aerosol without combustion, and has a rod shape extending along the longitudinal direction A. As shown in FIG. The aerosol generator 1A is composed of a power supply unit 710, a first cartridge 720, and a second cartridge 730 along the longitudinal direction A. As shown in FIG.

Here, the first cartridge 720 is detachable from the power supply unit 710 . Also, the second cartridge 730 is detachable with respect to the first cartridge 720 .
In other words, the first cartridge 720 and the second cartridge 730 are each replaceable.
The power supply unit 710 corresponds to the external case 20B (see FIG. 1D) in Embodiment 1, and incorporates MCU and other circuits in addition to the battery. In other words, the power supply unit 710 incorporates a circuit corresponding to the circuit unit 1000 . Incidentally, a button 714 is provided on the side surface of the power supply unit 710 . This button 714 corresponds to the push button 23 (see FIG. 1D).

The first cartridge 720 incorporates a tank that stores liquid as an aerosol source, a wick that draws the liquid from the tank by capillary action, and a coil that heats and vaporizes the liquid held in the wick.
The first cartridge 720 is also called an atomizer. In addition, the first cartridge 720 incorporates a flavor unit that adds flavor to the aerosol.
A suction port 732 is provided in the second cartridge 730 .
Note that the appearance of the aerosol generating device 1A shown in FIG. 18 is an example.

(6) In the above-described embodiments, the aerosol generator that heats the aerosol source has been described, but application to a nebulizer that generates aerosol using ultrasonic waves or the like is also possible. In this case, an ultrasonic vibrator is used instead of the heater. In this case, the MCU is configured to be able to control the vibration of the ultrasonic transducer.
(7) In the above-described embodiments, the aerosol generator was exemplified, but the configuration of the circuit unit described above can also be applied to portable electronic devices that do not have an aerosol generation mechanism. In particular, it can be applied to portable electronic equipment containing a plurality of ICs.

DESCRIPTION OF SYMBOLS 1, 1A... Aerosol generator, 10... External panel, 10A... Information window, 20... Main body housing, Internal panels 20A, 20B... External case, 22... Insertion hole, 22A... Container, 24... Translucent component, 30... Shutter , 40... Heating unit 50... Battery 60... Vibrator 100... MCU board 101... MCU 102... EEPROM 103... Charging IC 104, 106, 109... Load switch 200... USB connector board 201... Fuel gauge IC 300 LED and Bluetooth board 303 Bluetooth IC 400 Hall IC board 500 Chassis 600 Flexible board 710 Power supply unit 720 First cartridge 730 Second cartridge 1000 … circuit unit

Claims (15)

1. a heater connector to which a heater that consumes power supplied from a power source and heats the aerosol source is connected;
   a controller including a first communication terminal and a second communication terminal for serial communication and controlling power supply from the power supply to the heater;
   a first IC that is separate from the controller and includes a third communication terminal for serial communication;
   a second IC that is separate from the controller and the first IC and that includes a fourth communication terminal for serial communication;
   a first communication line connecting the first communication terminal and the third communication terminal;
   a second communication line connecting the second communication terminal and the fourth communication terminal;
   a first substrate;
   a second substrate that is separate from the first substrate and spaced apart from the first substrate;
   has
   The controller and the first IC are mounted on the first substrate,
   The second IC is mounted on the second substrate,
   A circuit unit for an aerosol generator.
2. The communication protocol used in the first communication line is the same as the communication protocol used in the second communication line.
   A circuit unit of an aerosol generator according to claim 1.
3. The communication protocol used in the first communication line is I2C or SPI.
   A circuit unit of an aerosol generator according to claim 1.
4. the second substrate is a substrate adjacent to the first substrate;
   The communication protocol used in the second communication line is I2C or SPI.
   A circuit unit of an aerosol generator according to claim 2 or 3.
5. a third substrate separate from the first substrate and the second substrate and separated from the first substrate and the second substrate;
   a third communication line connecting a sixth communication terminal of the first substrate and a seventh communication terminal of the third substrate;
   further having
   the third substrate is spaced apart from the first substrate more than the second substrate;
   the communication protocol used in the third communication line is UART;
   A circuit unit of an aerosol generator according to claim 2 or 3.
6. the frequency of communication on the second communication line is higher than the frequency of communication on the first communication line;
   The communication protocol used on the first communication line is I2C.
   The circuit unit of the aerosol generator according to any one of claims 2-5.
7. the number of ICs connected to the controller via the first communication line is greater than the number of ICs connected to the controller via the second communication line;
   The communication protocol used on the first communication line is I2C.
   The circuit unit of the aerosol generator according to any one of claims 2-5.
8. a third IC that is separate from any of the controller, the first IC, and the second IC and that includes a fifth communication terminal for serial communication;
   The first communication line connects the first communication terminal and the fifth communication terminal,
   The third IC is mounted on the first substrate,
   A circuit unit of an aerosol generator according to any one of claims 1-7.
9. The controller is
   Communicating with the first IC when the first condition is satisfied,
   Configured to communicate with the third IC when a second condition different from the first condition is satisfied,
   A circuit unit of an aerosol generator according to claim 8.
10. the controller operates in any one of a plurality of modes;
    wherein the plurality of modes includes a mode in which the controller communicates with only the third IC out of the first IC and the third IC;
    A circuit unit of an aerosol generator according to claim 8.
11. the number of ICs connected to the controller via the first communication line is greater than the number of ICs connected to the controller via the second communication line;
    A circuit unit of an aerosol generator according to any one of claims 1-10.
12. The second IC is the only IC connected to the controller via the second communication line.
    A circuit unit of an aerosol generator according to claim 11.
13. The second IC is a fuel gauge IC that acquires information on the power supply,
    Circuit unit of an aerosol generator according to claim 12.
14. The communication protocol used in the first communication line is different from the communication protocol used in the second communication line,
    A circuit unit of an aerosol generator according to claim 1.
15. a heater connector to which a heater that consumes power supplied from a power source and heats the aerosol source is connected;
    a controller including a first communication terminal and a second communication terminal for serial communication and controlling power supply from the power supply to the heater;
    a first IC that is separate from the controller and includes a third communication terminal for serial communication;
    a second IC that is separate from the controller and the first IC and that includes a fourth communication terminal for serial communication;
    a first communication line connecting the first communication terminal and the third communication terminal;
    a second communication line connecting the second communication terminal and the fourth communication terminal;
    a first substrate;
    a second substrate separate from the first substrate and separated from the first substrate;
    has
    The controller and the first IC are mounted on the first substrate,
    The second IC is mounted on the second substrate,
    Aerosol generator.

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