CN211983798U

CN211983798U - Dedicated MEMS pneumatic sensor of electron cigarette

Info

Publication number: CN211983798U
Application number: CN201922200961.8U
Authority: CN
Inventors: 崔明
Original assignee: Dongguan Yejia Electronic Technology Co ltd
Current assignee: Dongguan Yejia Electronic Technology Co ltd
Priority date: 2019-12-10
Filing date: 2019-12-10
Publication date: 2020-11-24
Anticipated expiration: 2029-12-10

Abstract

The utility model discloses a dedicated MEMS pneumatic sensor of electron cigarette, which comprises a circuit board, be close to its right side on the circuit board on the last silicon-based sensor of last surface electrical property fixedly connected with, be close to its left last surface electrical property fixedly connected with ASIC bare chip one on the circuit board, the last surface electrical property fixedly connected with ASIC bare chip two that is close to the rear side of ASIC bare chip one on the circuit board, the circumference surface of circuit board all has annular mounting substrate through scraping tin cream welding, annular mounting substrate's upper surface is through scraping tin cream fixedly connected with protection piece, be close to its left lower surface on the circuit board and seted up the venthole. The utility model discloses an above-mentioned isotructure's cooperation has solved current electron cigarette product and has mostly been the electret sensor, but the electret sensor is bulky, and inconvenient SMT and uniformity are poor, and interference killing feature and sensitivity are unstable simultaneously, have brought inconvenient problem for the normal use of electron cigarette.

Description

Dedicated MEMS pneumatic sensor of electron cigarette

Technical Field

The utility model relates to an electron cigarette technical field specifically is a dedicated MEMS pneumatic sensor of electron cigarette.

Background

The electron cigarette is the device that is changed liquid tobacco tar into vaporific aerosol and is inhaled by the person of suction, the electron cigarette that has sold in the market now mainly adopts the electrical heating mode to heat the atomizing with liquid tobacco tar and be vaporific aerosol, along with the continuous development of people's life demand, because the electron cigarette does not have tar in the traditional cigarette, other harmful components such as suspended particles, more and more people select to use the electron cigarette to replace traditional cigarette, some people still use the electron cigarette to quit smoking, the electron cigarette sensor that has now on the market all is the structure that adopts the electret, the principle: the sensor enters a sensor type through air flow, the inner membrane is deformed, the distance between the vibrating membrane and the substrate can be changed along with vibration, the capacitance between the substrates can be changed, a changed charge quantity Q is obtained according to Q C V, the change value of the charge quantity is processed and judged through an ASIC chip, and finally output control of the atomizer is finished. Because most of the existing electronic cigarette products are electret sensors, the electret sensors are large in size, inconvenient in SMT and poor in consistency, and meanwhile, the anti-interference capacity and the sensitivity are unstable, so that inconvenience is brought to normal use of the electronic cigarette, and improvement is needed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a dedicated MEMS pneumatic sensor of electron cigarette, possess this MEMS small and high temperature resistant, make things convenient for SMT, and through the setting of PMOS chip, make ASIC bare chip one provide PUMP operating voltage for silicon-based sensor, the PMOS chip is according to the inside PMOS output of state control of silicon-based sensor, and the PMOS output start-up condition of PMOS chip inside is-100 Pa to-400 Pa's negative pressure condition, thereby MEMS sensor's interference killing feature has been improved, make the MEMS sensor can be stable carry out the advantage of work, the problem of proposing in the background art has been solved.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a dedicated MEMS pneumatic sensor of electron cigarette, includes the circuit board, its characterized in that: the upper surface of the circuit board close to the right side of the circuit board is electrically and fixedly connected with a silicon-based sensor, the upper surface of the circuit board close to the left side of the circuit board is electrically and fixedly connected with an ASIC bare chip I, the upper surface of the circuit board close to the rear side of the ASIC bare chip I is electrically and fixedly connected with an ASIC bare chip II, the circumferential surface of the circuit board is welded with an annular mounting substrate through tin scraping paste, the upper surface of the annular mounting substrate is fixedly connected with a protective piece through the tin scraping paste, the lower surface of the circuit board close to the left side of the circuit board is provided with an air outlet, the circuit board is also electrically provided with an MCU (micro control unit), the MCU is electrically integrated with a protective circuit, a detection circuit, a Pmos drive circuit, charge management, a state lamp assembly, a negative pressure detection unit and a PUM, the capacitance variation is electrically connected to the negative voltage detection unit, and the Pmos driving circuit is electrically connected to the Pmos.

Furthermore, the silicon-based sensor is bound and connected with the first ASIC bare chip and the second ASIC bare chip through gold wires, and the second ASIC bare chip is a PMOS chip.

Furthermore, the bottom of the circuit board is fixedly connected with two pins.

Further, the surface cover of ASIC bare chip is equipped with the black glue protective sheath, the lower surface of black glue protective sheath passes through resin and glues fixed connection on the circuit board.

Furthermore, the protection piece is a metal shell, the bottom end of the metal shell is welded on the upper surface of the annular mounting substrate through tin scraping paste, and an air inlet hole is formed in the upper surface, close to the left side of the metal shell, of the metal shell.

Furthermore, the inner wall fixedly connected with filter screen of inlet port, and the filter screen is the active carbon filter screen.

Compared with the prior art, the beneficial effects of the utility model are as follows:

one, the utility model discloses a setting of programmability main control chip for ASIC bare chip provides PUMP operating voltage for silicon-based sensor, and main control chip is according to the inside PMOS output of state control of silicon-based sensor, and the inside PMOS output start condition of main control chip can be handed the adjustment according to self demand by the user, thereby improve the compatibility of electron cigarette equipment, also improved MEMS sensor's interference killing feature, make what MEMS sensor can be stable carry out work, the output of MEMS sensor has been increased simultaneously.

Two, the utility model discloses a cooperation of silica-based sensor and ASIC bare chip can constitute MEMS pneumatic sensor, utilizes MEMS technique to make atomizing chip can show and reduce atomizer weight, volume and improve the integrated level, and in addition, the MEMS technique is favorable to realizing mass, the standardized production of electron smog spinning disk atomiser to reduce the product quality differentiation defect that causes because of having the non-standardized manufacturing link in the current electron smog spinning disk atomiser manufacturing process, can reduce manufacturing cost simultaneously by a wide margin.

Drawings

Fig. 1 is a front view of the structure of the present invention;

fig. 2 is a top view of the circuit board of the present invention;

fig. 3 is a front sectional view of the present invention.

Fig. 4 is a schematic diagram of the MEMS chip function block of the electronic cigarette of the present invention.

Fig. 5 is a schematic view of the negative pressure value detection of the present invention.

In the figure: the circuit board is 1, the silicon-based sensor is 2, the ASIC bare chip I is 3, the ASIC bare chip II is 4, the annular mounting substrate is 5, the protecting piece is 6, the air outlet is 7, the pin is 8, the black glue protective sleeve is 9, the metal shell is 10, the air inlet is 11, the filter screen is 12, the MCU is 13, the protecting circuit is 14, the detecting circuit is 15, the Pmos driving circuit is 16, the charging management is 17, the status lamp assembly is 18, the negative pressure detecting unit is 19, the PUMP is 20, the MEMS sensor is 21, the capacitance variation is 22, and the Pmos is 23.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1 to 3, the present invention provides a technical solution: the utility model provides a dedicated MEMS pneumatic sensor of electron cigarette, includes circuit board 1, and the upper surface electricity fixedly connected with silica-based sensor 2 of being close to its right side on the circuit board 1.

The bottom fixedly connected with pin 8 of circuit board 1, the quantity of pin 8 is two, through the setting of two pin 8 for be convenient for peg graft MEMS sensor on electron.

The upper surface of the circuit board 1 close to the left side of the circuit board is electrically and fixedly connected with an ASIC bare chip I3, the upper surface of the circuit board 1 close to the rear side of the ASIC bare chip I3 is electrically and fixedly connected with an ASIC bare chip II 4, and the silicon-based sensor 2 and the ASIC bare chip I3 are matched to form an MEMS pneumatic sensor, so that the weight and the volume of an atomizer can be obviously reduced and the integration level can be improved by manufacturing an atomization chip by utilizing the MEMS technology, in addition, the MEMS technology is favorable for realizing batch and standardized production of the electronic aerosolizer, thereby reducing the product quality difference defect caused by non-standardized manufacturing links in the manufacturing process of the existing electronic aerosolizer, and simultaneously greatly reducing the production cost, and the manufacturing process of the MEMS sensor comprises the steps of firstly drawing silica gel on capacitors and resistors, then bonding the sensors, bonding the ASIC bare chips and the amplifiers, then welding wires, and secondly dispensing, then, packaging is carried out, solder paste is drawn after packaging is finished, then shell pasting is carried out, laser lettering is carried out, finally cutting and packaging are carried out, and the circuit board 1 is stored in a warehouse, the MCU micro control unit 13 is further electrically provided with the MCU micro control unit 13, the MCU micro control unit 13 is electrically integrated with the protection circuit 14, the detection circuit 15, the Pmos drive circuit 16, the charging management 17, the status lamp assembly 18, the negative pressure detection unit 19 and the PUMP20, the PUMP20 is electrically connected with the MEMS sensor 21, the MEMS sensor 21 is electrically connected with the capacitance variation 22, the capacitance variation 22 is electrically connected to the negative pressure detection unit 19, and the Pmos drive circuit 16 is electrically connected with the Pmos 23.

Furthermore, the silicon-based sensor 2, the ASIC bare chip I3 and the ASIC bare chip II 4 are all connected in a binding mode through gold wires, the ASIC bare chip II 4 is a programmable main control chip, the ASIC bare chip I3 is enabled to provide PUMP working voltage for the silicon-based sensor 2 through the arrangement of the main control chip, the main control chip controls the output of an internal PMOS according to the state of the silicon-based sensor, and the starting condition of the PMOS output inside the main control chip is customizable, so that the anti-interference capability of the MEMS sensor is improved, the MEMS sensor can stably work, and meanwhile the output power of the MEMS sensor is increased.

Further, ASIC bare chip 3's surface cover is equipped with black glue protective sheath 9, and the lower surface of black glue protective sheath 9 passes through resin and glues fixed connection on circuit board 1, and black glue protective sheath 9 has played the guard action to ASIC bare chip 3, has improved ASIC bare chip 3's life.

The circumferential surface of the circuit board 1 is welded with an annular mounting substrate 5 through tin scraping paste, the upper surface of the annular mounting substrate 5 is fixedly connected with a protection piece 6 through the tin scraping paste, and an air outlet 7 is formed in the circuit board 1 close to the lower surface of the left side of the circuit board.

Furthermore, the protection member 6 is a metal shell 10, the bottom end of the metal shell 10 is welded on the upper surface of the annular mounting substrate 5 through solder paste, an air inlet 11 is formed in the upper surface, close to the left side of the metal shell 10, external air enters from the air inlet 11, air is conveniently discharged from the air outlet 6 in the metal shell 10, air is supplied and discharged to form an air pressure difference, the PMOS output starting condition in the PMOS chip is a negative pressure condition from-100 Pa to-400 Pa, the device starts to work under the air pressure difference, and the metal shell 10 plays a role in protecting the electronic devices of the circuit board 1.

Further, the inner wall of the air inlet 11 is fixedly connected with a filter screen 12, the filter screen 12 filters the gas entering the metal shell 10, and the filter screen 12 is an activated carbon filter screen.

1. The working principle is as follows: when the MEMS pneumatic sensor special for the electronic cigarette is used, the MEMS pneumatic sensor is inserted on the electronic cigarette through the pin 8, the MEMS pneumatic sensor can be formed through the matching of the silicon-based sensor 2 and the ASIC bare chip I3, the atomization chip manufactured by the MEMS technology can obviously reduce the weight and the volume of the atomizer and improve the integration level, the air flow causes the deformation of a diaphragm on the MEMS sensor 21, then the capacitance value is changed, when the capacitance value is relatively increased by one sixteenth, the potential is converted through the negative pressure detection unit 19 to obtain the corresponding potential value, the chip is internally provided with the booster circuit, the output is controlled and adjusted by the PWM regulation and control means, the power output is realized, the atomization effect is unchanged from head to tail, the taste is not changed along with the increase and decrease of electric quantity, in addition, the MEMS technology is favorable for realizing the batch and standardized production of the electronic cigarette atomizer, thereby reducing the product quality differentiation defect caused by the existence of non-standardized manufacturing links in the manufacturing process of the existing electronic cigarette atomizer, meanwhile, the production cost can be greatly reduced, the ASIC bare chip 3 provides the PUMP working voltage for the silicon-based sensor 2 through the setting of the programmable main control chip, the main control chip controls the output of the internal PMOS according to the state of the silicon-based sensor, and the starting condition of the output of the PMOS in the main control chip can be freely set, so that the anti-interference capacity of the MEMS sensor is improved, the MEMS sensor can stably work, and the output power of the MEMS sensor is increased.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a dedicated MEMS pneumatic sensor of electron cigarette, includes circuit board (1), its characterized in that: be close to its upper surface electric property fixedly connected with silica-based sensor (2) on right side on circuit board (1), be close to its left upper surface electric property fixedly connected with ASIC bare chip (3) on circuit board (1), be close to the upper surface electric property fixedly connected with ASIC bare chip two (4) of the rear side of ASIC bare chip (3) on circuit board (1), the circumference surface of circuit board (1) all welds annular mounting substrate (5) through scraping tin cream, the upper surface of annular mounting substrate (5) is through scraping tin cream fixedly connected with protection piece (6), venthole (7) have been seted up near its left lower surface on circuit board (1), circuit board (1) still electrical property is provided with MCU little the control unit (13), MCU little the control unit (13) go up electrical property integrated protection circuit (14), detection circuit (15), Pmos drive circuit (16), The electronic ballast comprises a charging management unit (17), a state lamp assembly (18), a negative pressure detection unit (19) and a PUMP (20), wherein the PUMP (20) is electrically connected with an MEMS sensor (21), the MEMS sensor (21) is electrically connected with a capacitance variation (22), the capacitance variation (22) is electrically connected to the negative pressure detection unit (19), and a Pmos (23) is electrically connected to a Pmos drive circuit (16).

2. The MEMS pneumatic sensor special for the electronic cigarette according to claim 1, wherein: the silicon-based sensor (2) is connected with the ASIC bare chip I (3) and the ASIC bare chip II (4) in a binding mode through gold wires, and the ASIC bare chip II (4) is a PMOS chip.

3. The MEMS pneumatic sensor special for the electronic cigarette according to claim 1, wherein: the bottom fixedly connected with pin (8) of circuit board (1), the quantity of pin (8) is two.

4. The MEMS pneumatic sensor special for the electronic cigarette according to claim 1, wherein: the surface cover of ASIC bare chip (3) is equipped with black glue protective sheath (9), the lower surface of black glue protective sheath (9) passes through resin and glues fixed connection on circuit board (1).

5. The MEMS pneumatic sensor special for the electronic cigarette according to claim 1, wherein: the protection piece (6) is a metal shell (10), the bottom end of the metal shell (10) is welded on the upper surface of the annular mounting substrate (5) through tin scraping paste, and an air inlet hole (11) is formed in the upper surface, close to the left side of the metal shell (10), of the metal shell.

6. The MEMS pneumatic sensor special for the electronic cigarette according to claim 5, wherein: the inner wall of the air inlet hole (11) is fixedly connected with a filter screen (12), and the filter screen (12) is an activated carbon filter screen.