CN210929647U

CN210929647U - Electronic cigarette chip with automatic closed-loop control output voltage

Info

Publication number: CN210929647U
Application number: CN201921605485.1U
Authority: CN
Inventors: 林光榕; 郑贤彬; 张夕勇
Original assignee: Shenzhen Happy Vaping Technology Ltd
Current assignee: Huizhou Happy Vaping Technology Ltd
Priority date: 2019-09-25
Filing date: 2019-09-25
Publication date: 2020-07-07
Anticipated expiration: 2029-09-25

Abstract

The utility model discloses an electronic cigarette chip with automatic closed-loop control output voltage, this chip is including built-in MCU module, full-bridge boost-buck module, output voltage feedback circuit module, inside power module, unit module and a plurality of signal end are put to fortune, VOUT signal end is used for to the heating element output voltage of electronic cigarette, output voltage feedback circuit module feeds back the output voltage of VOUT signal end to built-in MCU module, fortune is put the resistance that unit module is used for detecting the heating element of electronic cigarette and is sent built-in MCU module to fortune, built-in MCU module carries out high accuracy operation and automatic control full-bridge boost-buck module so that export adjustable accurate voltage through VOUT signal end according to the set signal of outside chip, the feedback signal of output voltage feedback circuit module; the beneficial effects of the utility model are that, can realize closed loop automatic control's accurate voltage output or constant power output to realize the stability of the atomizing volume and the stability of smoking taste among the electron cigarette smoking process.

Description

Electronic cigarette chip with automatic closed-loop control output voltage

Technical Field

The utility model relates to an electron cigarette technical field, more specifically the utility model relates to an electron cigarette chip with automatic closed-loop control output voltage.

Background

The existing atomization electronic cigarette generally atomizes the cigarette liquid through the heating of the atomizer to generate smoke for smokers to use, and because the cigarette liquid of the electronic cigarette does not contain cigarette tar, the harm of the cigarette tar to the bodies of people is avoided, so that the electronic cigarette gradually replaces cigarettes to be widely used.

The power of the existing electronic cigarette is from an internal battery, when the electronic cigarette is just started to be used, the output voltage of the battery is too high, the smoke amount is too large during smoking, the electric quantity of the battery is gradually reduced from high to bottom along with the increase of the service time of the electronic cigarette, the output voltage of the battery is also continuously reduced, and the smoke amount is greatly reduced due to too low later-stage voltage. Meanwhile, the resistance value of the heating resistor of the electronic cigarette atomized liquid may change along with the change of the atomization temperature, so that the working power of the heating resistor also changes continuously, and the amount of the emitted smoke is also very unstable in different stages of battery power consumption and different heating temperatures when a user smokes. Therefore, a circuit capable of performing voltage step-up and step-down control is needed to achieve stable output of the power voltage, and meanwhile, the output voltage needs to be adjusted in real time according to the resistance value change of the heating resistor, so that the output power is stable to keep constant smoke amount.

The existing electronic cigarette generally adopts PWM pulse width modulation to output voltage to a heating element, the amplitude and the frequency of the output voltage are changed by adjusting a duty ratio, but when the battery voltage is lower than the required output voltage, the required output voltage cannot be achieved. The full-bridge boost-buck circuit applied to other fields has a complex structure and a large volume, is not beneficial to being installed and used in a tight space of an electronic cigarette, does not have a circuit for accurately controlling output voltage and outputting stable power, and has unstable performance and high manufacturing cost.

The existing electronic cigarette chip only has the current path for controlling the heating wire through a switching tube or only has the constant voltage output control, but cannot adjust the voltage output to realize the constancy of the power, so the actual requirement cannot be met.

Disclosure of Invention

An object of the utility model is to provide an electron cigarette chip with automatic closed-loop control output voltage for overcoming the not enough of above-mentioned technique, this electron cigarette chip with automatic closed-loop control output voltage realizes exporting accurate adjustable voltage and the invariable power of output through automatic closed-loop control.

The technical scheme of the utility model is realized like this, an electron cigarette chip with automatic closed-loop control output voltage, including built-in MCU module, full-bridge buck-boost module, output voltage feedback circuit module, inside power module, operational amplifier unit module and a plurality of signal end, full-bridge buck-boost module includes four N channel MOS pipes and four PWM drive logic circuit, built-in MCU module connects and controls four PWM drive logic circuit, four PWM drive logic circuit connect and control four N channel MOS pipes respectively, wherein first PWM drive logic circuit still connects BOOT1 signal end and SW1 signal end, fourth PWM drive logic circuit still connects BOOT2 signal end and SW2 signal end, first N channel MOS pipe is connected with second N channel MOS pipe electricity, fourth N channel MOS pipe is connected with third N channel MOS pipe electricity, first N channel MOS pipe still is connected with outside input voltage end VIN signal end promptly, the fourth N-channel MOS tube is further connected with a VOUT signal end, the VOUT signal end is used for outputting voltage to a heating element of the electronic cigarette, the second PWM driving logic circuit, the second N-channel MOS tube, the third N-channel MOS tube and the third PWM driving logic circuit are respectively provided with a port and connected with a PGND grounding end, the output voltage of the VOUT signal end is fed back to the built-in MCU module by the output voltage feedback circuit module, the input voltage of the VIN signal end is boosted by the internal power supply module and then supplied to the four PWM driving logic circuits, the operational amplifier unit module is used for detecting the resistance value of the heating element, generating a differential analog signal through operational amplifier and transmitting the differential analog signal to the built-in MCU module, the built-in MCU module generates a resistance value signal through operation and transmits the resistance value signal to an external chip, and the built-in MCU module performs high-precision operation and automatically controls the full-bridge voltage boosting and boosting according to a setting signal of the external chip and the module is used for outputting adjustable accurate voltage through the VOUT signal end.

Preferably, the external chip further comprises a VDD power supply signal terminal, a GND ground signal terminal, a SDA data communication signal terminal, an SCL communication clock signal terminal, and an EN enable signal terminal, which are connected to the built-in MCU module, the SDA data communication signal terminal is used for interactive data communication between an external chip and the built-in MCU module, a set signal of the external chip includes a set value signal of an output voltage, which is transmitted to the built-in MCU module through the SDA data communication signal terminal and the SCL communication clock signal terminal, the EN enable signal terminal is used for inputting an activation signal to activate the built-in MCU module, and the built-in MCU module is in a sleep state before being activated so that an output voltage value of the VOUT signal terminal is zero.

Preferably, the set value signal of the output voltage is generated by an external chip according to the resistance signal.

Preferably, the built-in MCU module includes a PID controller, and the PID controller can perform proportional, integral and differential control on the full-bridge buck-boost module to output an adjustable accurate voltage.

Preferably, the MCU module includes an AD/a conversion unit, the AD/a conversion unit can convert an analog signal into a digital signal to realize high-precision control, and the number of the AD/a conversion unit is 12 or more.

Preferably, the input circuit further comprises an IN + signal end and an IN-signal end, wherein the IN + signal end and the IN-signal end are connected with the operational amplifier unit module, the IN + signal end is used for being connected with a VOUT signal end, the IN-signal end is used for being connected with one end of the heating element, and a resistor is further connected between the IN + signal end and the IN-signal end IN series.

Preferably, an inductor is further connected in series between the SW1 signal terminal and the SW2 signal terminal, a first capacitor is connected in series between the SW1 signal terminal and the BOOT1 signal terminal, and a second capacitor is connected in series between the SW2 signal terminal and the BOOT2 signal terminal.

Preferably, the input voltage range of the VIN signal end is 2.5V to 12V, and the output voltage range of the VOUT signal end is 0V to 18V.

Preferably, the protection circuit also comprises an internal circuit protection module, wherein the internal circuit protection module is electrically connected with the built-in MCU module and is used for overvoltage, undervoltage, overcurrent and overtemperature protection of the internal circuit of the chip.

The beneficial effects of the utility model are that, this electron cigarette chip with automatic closed-loop control output voltage, built-in MCU module and the output voltage feedback circuit module that have high accuracy AD have been put to the chip, and built-in MCU module inside still is equipped with the PID controller, can carry out the buck-boost regulation and realize the PID high accuracy automatic control of output voltage to full-bridge buck-boost module, built-in high accuracy fortune is put the unit simultaneously, can realize the accurate detection of heating element resistance, according to heating element's resistance, built-in MCU module can realize the adjustable voltage output of different numerical values, in order to guarantee to realize stable accurate voltage output or invariable power output, thereby realize the stability of atomizing volume and the stability of smoking taste in the smoking process; the chip is internally provided with an internal circuit protection module, so that automatic overvoltage, undervoltage, overcurrent, overtemperature and other protections can be realized; by arranging the EN enabling signal end, when the EN enabling signal end does not activate signals, the chip is in a dormant state so as to save energy and realize low power consumption; the chip also has an EMI automatic anti-interference adjusting function; in addition, the chip has high integration level, few external components, high working efficiency, small heat productivity and small chip volume, and is very easy to install in the electronic cigarette with narrow volume space.

Drawings

Fig. 1 is a diagram of an internal circuit structure of an electronic cigarette chip according to an embodiment of the present invention;

fig. 2 is a circuit connection diagram of the IN + and IN-signal terminals of the electronic cigarette chip according to the embodiment of the present invention;

fig. 3 is a circuit connection diagram of the signal terminals SW1 and SW2 of the electronic cigarette chip according to the embodiment of the present invention;

fig. 4 is a circuit connection diagram of the SW1 and the BOOT1 signal terminal of the electronic cigarette chip according to the embodiment of the present invention;

fig. 5 is a circuit connection diagram of the SW2 and the BOOT2 signal terminal of the electronic cigarette chip according to the embodiment of the present invention;

fig. 6 is a diagram of an internal circuit structure of an electronic cigarette chip according to another embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Examples

As shown in fig. 1, the utility model discloses an electron cigarette chip with automatic closed-loop control output voltage, including built-in MCU module, full-bridge buck-boost module, output voltage feedback circuit module, inside power module, fortune put unit module and a plurality of signal end, the signal end is also exactly the pin of chip, and built-in MCU module is also exactly the microcontroller operation module of the inside setting of chip. The full-bridge buck-boost module comprises four N-channel MOS tubes (N MOS tube 1, N MOS tube 2, N MOS tube 3, N MOS tube 4) and four PWM driving logic circuits (PWM driving logic circuit 1, PWM driving logic circuit 2, PWM driving logic circuit 3, PWM driving logic circuit 4), the built-in MCU module is respectively connected with and controls the four PWM driving logic circuits through four circuits of DRIVER1, DRIVER2, DRIVER3 and DRIVER4, the four PWM driving logic circuits are respectively connected with and control the four N-channel MOS tubes, wherein the first PWM driving logic circuit (PWM driving logic circuit 1) is also connected with a BOOT1 signal end and a SW1 signal end, the fourth PWM driving logic circuit (PWM driving logic circuit 4) is also connected with a BOOT2 signal end and a SW2 signal end, the first N-channel MOS tube (N MOS tube 1) is electrically connected with the second N-channel MOS tube (N MOS tube 2), and the fourth N-channel MOS tube (N MOS tube 4) is electrically connected with a third N-channel MOS tube (N MOS tube 3), the first N-channel MOS tube (N MOS tube 1) is also connected with an external input voltage end, namely a VIN signal end, the fourth N-channel MOS tube (N MOS tube 4) is also connected with an external output voltage end, namely a VOUT signal end, the VOUT signal end is used for outputting voltage to a heating element of the electronic cigarette, the heating element is a heating resistor with resistance value, a second PWM driving logic circuit (PWM driving logic circuit 2), a second N-channel MOS tube, a third N-channel MOS tube and a third PWM driving logic circuit (PWM driving logic circuit 3) are respectively provided with a port connected with a PGND grounding end, an output voltage feedback circuit module feeds the output voltage of the VOUT signal end back to the built-in MCU module, an internal power supply module supplies power to the four PWM driving logic circuits through AVCC signal ends after boosting the input voltage of the VIN signal end, and the operational amplifier unit module is used for detecting the resistance value of the heating element, the differential analog signal is generated through the operational amplifier and transmitted to the built-in MCU module, the built-in MCU module generates a resistance signal through operation and transmits the resistance signal to an external chip (or external equipment with an operation function, an external circuit and the like), the built-in MCU module performs high-precision operation according to a setting signal of the external chip, a feedback signal of the output voltage feedback circuit module automatically controls the full-bridge voltage boosting and reducing module so as to output adjustable accurate and stable voltage through a VOUT signal end, and the output voltage can be automatically adjusted according to the setting signal of the external chip and can be adjusted to linear voltages with different values.

As shown in fig. 1, the utility model discloses electron cigarette chip with automatic closed-loop control output voltage still includes VDD power supply signal end, GND ground signal end, SDA data communication signal end, SCL communication clock signal end and the EN enable signal end of being connected with built-in MCU module. The device comprises a VDD power supply signal end, an SDA data communication signal end, an external chip, an SCL communication clock signal end, an EN enabling signal end, an EN enable signal end and an VOUT signal end, wherein the VDD power supply signal end is used for supplying power to a built-in MCU module, the SDA data communication signal end is used for interactive data communication between the external chip and the built-in MCU module, a set signal of the external chip comprises a set value signal of output voltage, the set value signal is transmitted into the built-in MCU module through the SDA data communication signal end and the SCL communication clock signal end, the EN enable signal end is used. The set value signal of the output voltage is generated by the operation of an external chip according to the resistance value signal, the preset power value and the like.

As shown in fig. 1, the MCU module includes a PID controller, and the PID controller can perform proportional, integral and differential control on the full-bridge buck-boost module to output an accurate voltage.

The built-in MCU module comprises an AD conversion unit, the AD conversion unit can convert an analog signal into a digital signal to realize high-precision control, and the number of the AD conversion unit is more than 12.

As shown IN fig. 1 and 2, the utility model discloses electron cigarette chip with automatic closed-loop control output voltage still includes IN + signal end and IN-signal end of being connected with the unit module is put to fortune, and IN + signal end is used for being connected with VOUT signal end, and IN-signal end is used for being connected with heating element Load one end, still concatenates a reference resistance R1 between IN + signal end and the IN-signal end. The operational amplifier unit module has a high-precision operational amplifier function, and can realize the accurate detection of the resistance value of the heating element.

As shown in fig. 3, fig. 4, fig. 5, the utility model discloses an electron cigarette chip still concatenates an inductance L1 between SW1 signal end and the SW2 signal end, and inductance L1 is used for storing the release energy, and the circuit of cooperation full-bridge buck-boost module steps up and steps down. The first capacitor C1 is connected between the SW1 signal terminal and the BOOT1 signal terminal in series, the second capacitor C2 is connected between the SW2 signal terminal and the BOOT2 signal terminal in series, and the capacitors C1 and C2 are used for EMI electromagnetic filtering and preventing electromagnetic interference. Therefore, the chip can simply realize the EMI automatic anti-interference adjusting function.

As shown in fig. 1, the utility model discloses electron cigarette chip with automatic closed-loop control output voltage, its main theory of operation is, does not need this chip during operation, and EN enables the signal end and does not have the input activating signal, and built-in MCU module is out of work, and VOUT signal end does not have the output this moment, and this chip is in the dormancy state so that energy-conservation realizes the low-power consumption. When the chip needs to work, an external chip inputs an activation signal through an EN enabling signal end, a built-in MCU module starts to work, an SDA signal end carries out bidirectional data signal transmission, the built-in MCU module receives a new set value of the external chip to output voltage, a PID controller carries out time sequence control on four PWM driving logic circuits, the four PWM driving logic circuits respectively control four N-channel MOS (metal oxide semiconductor) tubes, the input voltage of a VIN signal end is regulated into output voltage, the output voltage feeds back the signal to the built-in MCU module through an output voltage feedback module, after the PID controller carries out proportional integral differential regulation, accurate output voltage is output and is output to a heating element of an electronic cigarette through a VOUT signal end, and the heating element of the electronic cigarette works under stable and adjustable voltage. The output voltage of the VOUT signal end can be adjusted accurately and stably, the output voltage can be automatically adjusted according to the setting signal of the external chip, and the output voltage can be adjusted to linear voltages with different values.

The function of accurate, stable voltage of above-mentioned chip exports can be applied to the output constant voltage, also can be according to heating element's resistance change adjustment voltage output to guarantee heating element's constant power and use.

As shown IN the figure 1, the operational amplifier unit can detect the resistance R of the heating element of the electronic cigarette through an IN + signal end and an IN-signal end, processes and converts a detected resistance R signal and then transmits the signal to the built-IN MCU module, and the built-IN MCU module transmits the signal to the external chip. When the electronic cigarette heating element works, the cigarette liquid is atomized into the smoke, and the energy conversion is needed, so the smoke quantity depends on the power of the electronic cigarette heating element, and the smoke quantity is larger when the power is larger, and vice versa. When the heating element of the electronic cigarette works at high temperature, the resistance value R may change, because the power P of the heating element is equal to U²and/R, when the resistance value R changes, if the voltage U of the resistance value R keeps unchanged, the power of the resistance value R changes, the power of the resistance value R needs to be kept unchanged in order to ensure that the smoke quantity of the heating element of the electronic cigarette keeps stable, and the output voltage U needs to be regulated so as to keep the power unchanged. Under the principle, the external chip calculates a new voltage set value U according to the resistance value R detected in real time, and inputs the new voltage set value U to the built-in MCU module through the SDA signal end, the built-in MCU module adjusts the full-bridge buck-boost module through the PID controller, a new output voltage U is output at the VOUT signal end, and the power P is kept unchanged so as to keep the smoke quantity stable.

As shown in FIG. 1, the preferred input voltage range of VIN signal terminal of the present invention is 2.5V-12V, the preferred output voltage range of VOUT signal terminal is 0V-18V, and the preferred output current is 0A-8A.

As shown in fig. 6, the utility model discloses in another embodiment of electron cigarette chip with automatic closed-loop control output voltage, still include internal circuit protection module, internal circuit protection module is connected with built-in MCU module electricity for protection such as the excessive pressure of protection chip internal circuit, under-voltage, overflow, short circuit, overtemperature prevents the damage of chip.

The chip internal component has small volume and high integration level, so that the external component is greatly reduced, the working efficiency is improved, the heat productivity is low, the chip volume is small, and the chip is very easy to install in the electronic cigarette with small volume space.

The above description is only for the preferred embodiment of the present invention, and the above specific embodiments are not intended to limit the present invention. Within the scope of the technical idea of the present invention, various modifications and alterations can be made, and any person skilled in the art can make modifications, amendments or equivalent replacements according to the above description, all belonging to the protection scope of the present invention.

Claims

1. An electronic cigarette chip with an automatic closed-loop control output voltage is characterized by comprising a built-in MCU module, a full-bridge buck-boost module, an output voltage feedback circuit module, an internal power supply module, an operational amplifier unit module and a plurality of signal ends, wherein the full-bridge buck-boost module comprises four N-channel MOS (metal oxide semiconductor) tubes and four PWM (pulse width modulation) driving logic circuits, the built-in MCU module is connected with and controls the four PWM driving logic circuits, the four PWM driving logic circuits are respectively connected with and control the four N-channel MOS tubes, a first PWM driving logic circuit is also connected with a BOOT1 signal end and a SW1 signal end, a fourth PWM driving logic circuit is also connected with a BOOT2 signal end and a SW2 signal end, the first N-channel MOS tube is electrically connected with a second N-channel MOS tube, the fourth N-channel MOS tube is electrically connected with a third N-channel MOS tube, the first N-channel MOS tube is also connected with an external input voltage end, namely a VIN, the fourth N-channel MOS tube is further connected with a VOUT signal end, the VOUT signal end is used for outputting voltage to a heating element of the electronic cigarette, the second PWM driving logic circuit, the second N-channel MOS tube, the third N-channel MOS tube and the third PWM driving logic circuit are respectively provided with a port to be connected with a PGND grounding end, the output voltage of the VOUT signal end is fed back to the built-in MCU module by the output voltage feedback circuit module, the input voltage of the VIN signal end is boosted by the internal power supply module and then supplied to the four PWM driving logic circuits, the operational amplification unit module is used for detecting the resistance value of the heating element, a differential analog signal is generated by operational amplification and is transmitted to the built-in MCU module, the built-in MCU module generates a resistance value signal by operation and transmits the resistance value signal to an external chip, and the built-in MCU module performs high-precision operation and automatically controls the full-bridge voltage boosting and boosting module according to a setting signal of the external chip and so as to output adjustable accurate voltage through the signal terminal of VOUT.

2. The electronic cigarette chip with the automatic closed-loop control output voltage according to claim 1, further comprising a VDD power supply signal terminal, a GND ground signal terminal, a SDA data communication signal terminal, an SCL communication clock signal terminal, and an EN enable signal terminal connected to the built-in MCU module, wherein the SDA data communication signal terminal is used for interactive data communication between an external chip and the built-in MCU module, the setting signal of the external chip comprises a setting value signal of the output voltage transmitted to the built-in MCU module through the SDA data communication signal terminal and the SCL communication clock signal terminal, the EN enable signal terminal is used for inputting an activation signal to activate the built-in MCU module, and the built-in MCU module is in a sleep state before being activated so that the output voltage value of the VOUT signal terminal is zero.

3. The electronic cigarette chip with automatic closed-loop control of output voltage according to claim 2, wherein the set value signal of the output voltage is generated by an external chip according to the resistance signal.

4. The electronic cigarette chip with the automatic closed-loop control of the output voltage according to claim 1, wherein the MCU module comprises a PID controller, and the PID controller can perform proportional, integral and differential control on the full-bridge buck-boost module to output an adjustable precise voltage.

5. The electronic cigarette chip with the automatic closed-loop control output voltage according to claim 1, wherein the built-in MCU module comprises an AD conversion unit, the AD conversion unit can convert an analog signal into a digital signal for realizing high-precision control, and the number of the AD conversion unit is more than 12.

6. The electronic cigarette chip with the automatic closed-loop control output voltage according to claim 1, further comprising an IN + signal terminal and an IN-signal terminal connected with the operational amplifier unit module, wherein the IN + signal terminal is used for being connected with a VOUT signal terminal, the IN-signal terminal is used for being connected with one end of the heating element, and a resistor is further connected IN series between the IN + signal terminal and the IN-signal terminal.

7. The electronic cigarette chip with the output voltage controlled automatically in a closed loop according to claim 1, wherein an inductor is further connected in series between the signal terminal SW1 and the signal terminal SW2, a first capacitor is connected in series between the signal terminal SW1 and the signal terminal BOOT1, and a second capacitor is connected in series between the signal terminal SW2 and the signal terminal BOOT 2.

8. The electronic cigarette chip with the automatic closed-loop control output voltage according to claim 1, wherein the input voltage range of the VIN signal terminal is 2.5V-12V, and the output voltage range of the VOUT signal terminal is 0V-18V.

9. The electronic cigarette chip with the automatic closed-loop control output voltage according to claim 1, further comprising an internal circuit protection module, wherein the internal circuit protection module is electrically connected with the built-in MCU module and is used for overvoltage, undervoltage, overcurrent and overtemperature protection of the internal circuit of the chip.