CN217466075U

CN217466075U - Constant-power type air pressure sensing device

Info

Publication number: CN217466075U
Application number: CN202220226248.XU
Authority: CN
Inventors: 周卫; 刘善进
Original assignee: Changsha Dawei Semiconductor Co ltd
Current assignee: Changsha Dawei Semiconductor Co ltd
Priority date: 2022-01-25
Filing date: 2022-01-25
Publication date: 2022-09-20
Anticipated expiration: 2032-01-25

Abstract

The utility model discloses a constant power type pressure sensing device, its constant power output, small and high temperature resistant, the interference killing feature is strong, and stability is good, the uniformity is good, and the area carries the ability reinforce. The utility model comprises a circuit board and a shell covering the circuit board, wherein the circuit board is arranged at the opening of the shell, and the shell and the circuit board form a covered holding space; the inner surface of the circuit board facing the shell is provided with an air pressure sensor, an ASIC chip and a filter capacitor C1, wherein the ASIC chip comprises a decoder, and the input end of the decoder is connected with the output pin of the air pressure sensor; the decoder of the ASIC chip processes and analyzes the received capacitance value change of the air pressure sensor, the capacitance value change is output to the A/D converter after passing through the signal amplifier, and finally the signal is transmitted to the controller by the A/D converter; the output end of the driver is connected with a load. The utility model is waterproof and oilproof, and has high sensitivity and good stability; the product is convenient to miniaturize and integrate.

Description

Constant-power type air pressure sensing device

Technical Field

The utility model relates to a sensor field, in particular to be applied to the relevant constant power output type atmospheric pressure sensing device such as electron cigarette instrument or equipment, electron chewing gum, breathing machine, portable medical atomization equipment of negative pressure sensing device.

Background

With the increasing maturity of semiconductor manufacturing technology, the mems developed on the basis of the above technology has the advantages of small size, low power consumption and stable performance, which is one of the mainstream of the modern high-tech development. The encapsulation of microelectromechanical components has different functions, and the encapsulation protects the components from mechanical and chemical environmental influences. Furthermore, the type of enclosure or housing determines how the assembly is installed and switched on at the place of use.

Most of the electronic cigarette sensors in the existing market adopt electret structures, when the sensors enter the sensors through airflow, the internal diaphragm deforms, the distance between the vibrating diaphragm and the substrate changes along with vibration, the capacitance between the substrates changes, the change value of the charge quantity is judged through processing, and finally the output control of the atomizer is finished.

The existing electronic cigarette sensor has the following defects: the volume is large, the SMT is not suitable, the production efficiency is low, the consistency is poor, the temperature resistance is not high, the production reject ratio is high, and the sensitivity is unstable.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a constant power type pressure sensing device, its constant power output, small and high temperature resistant is suitable for SMT, and the interference killing feature is strong, and stability is good, the uniformity is good, and the area carries the ability reinforce.

The utility model discloses specific technical scheme as follows:

a constant-power air pressure sensing device comprises a circuit board and a shell covering the circuit board, wherein the circuit board is arranged at an opening of the shell, and the shell and the circuit board form a covered accommodating space; the inner surface of the circuit board facing the shell is provided with an air pressure sensor, an ASIC chip and a filter capacitor C1, the air pressure sensor, the ASIC chip and the filter capacitor C1 are electrically connected with a power supply positive VDD, and the power supply positive VDD is grounded after passing through the filter capacitor C1; the output pin of the ASIC chip is connected with a load RL;

the ASIC chip comprises a decoder, and the input end of the decoder is connected with the output pin of the air pressure sensor; the decoder of the ASIC chip processes and analyzes the received capacitance value change of the air pressure sensor, the capacitance value change is output to the A/D converter after passing through the signal amplifier, and finally the signal is transmitted to the controller by the A/D converter;

the controller is connected with the driver; the output end of the driver is connected with a load RL; the driver controls the load RL according to the electric signal of the controller;

the ASIC chip also comprises a constant current and constant voltage manager, wherein the input end of the constant current and constant voltage manager is connected with a power supply positive VDD, the output end of the constant current and constant voltage manager is electrically connected with the controller and the driver, and an inductor L1 is connected between the constant current and constant voltage manager and the power supply positive VDD in parallel.

Further, in some embodiments, the signals of the air pressure sensor are transmitted to a decoder and then to an A/D converter through a signal amplifier; the input end of the A/D converter is connected with the signal amplifier, the A/D converter is connected with the controller after converting the A/D converter into a digital signal, and the controller realizes the instruction and control of the driver; the output end of the controller is connected with a load RL after passing through the driver;

the controller is communicated with the units such as the decoder, the signal amplifier, the constant current and constant voltage manager and the A/D converter, and detects, adjusts and controls the units and enables the units to work stably.

Further, in some embodiments, the output pin of the air pressure sensor is connected to pin 1 of the ASIC chip, and pin 1 of the ASIC chip is an input terminal of the decoder;

the ASIC chip pin 3 is connected with a positive power VDD, and the ASIC chip pin 3 is connected with a constant current and constant voltage manager; the pin 4 of the ASIC chip is connected with a constant current and constant voltage manager, the input end of the constant current and constant voltage manager is connected with an inductor L1 through the pin 4, and the other end of the inductor L1 is connected with a positive power supply VDD;

an ASIC chip pin 5 is the output end of the controller, and the ASIC chip pin 5 is connected with an LED indicator light;

the ASIC chip pin 6 is the output end of the driver, and the ASIC chip pin 6 is connected with a load RL; ASIC chip pin 2 is grounded.

Further, in some embodiments, the pin 1 at the input end of the decoder of the ASIC chip is connected to the output pin of the air pressure sensor through a gold wire;

the filter capacitor C1 is fixed on the circuit board by solder paste through SMT.

Further, in some embodiments, a first air vent communicated with the air pressure sensor is formed at the bottom end of the air pressure sensor on the circuit board; one side of the shell, which is far away from the circuit board, is provided with one or more second air guide holes, and the first air guide holes and the second air guide holes are arranged in a staggered manner; the first air guide hole is communicated with the air pressure sensor after penetrating through the circuit board.

Further, in some embodiments, an encapsulation adhesive is disposed outside the ASIC chip, and the encapsulation adhesive completely covers and encapsulates the ASIC chip on the circuit board;

the outer side of one side of the shell, which is far away from the circuit board, is provided with a waterproof net for preventing dust from permeating, and the waterproof net covers the second air guide hole completely; a circle of closed protective and reinforcing silica gel is arranged on the periphery of the contact end of the air pressure sensor and the circuit board, and a circle of solder paste arranged on the circuit board through the outer edge is fixed at an opening at the bottom end of the shell by adopting an SMT paster.

Further, in some embodiments, the output end of the constant current and constant voltage manager is electrically connected with each unit in the ASIC chip, and the unit in the ASIC chip comprises a decoder, a signal amplifier, a controller, a driver and an a/D converter.

The utility model can output constant power, has high temperature resistance of not less than 260 ℃, has high SMT process welding efficiency and yield, and is suitable for large-scale mass production; the water-proof and oil-proof sensor can prevent liquid (oil or water) from dropping to send signals by mistake, and has high sensitivity and good stability; the product is convenient to miniaturize and integrate, and the design of the product scheme is flexible.

Drawings

Fig. 1 is a schematic diagram of an embodiment of the present invention;

fig. 2 is a schematic circuit diagram of an embodiment of the present invention;

fig. 3 is a schematic structural diagram of an embodiment of the present invention;

fig. 4 is a schematic block diagram of an embodiment of the present invention.

The labels in the figure are:

the device comprises a shell 11, silica gel 12, solder paste 13, a first air vent 14, an air pressure sensor 15, a waterproof net 16, an encapsulating glue 17, a second air vent 18, a circuit board 19, an ASIC chip 20, a decoder 22, a signal amplifier 23, a controller 24, a constant current and constant voltage manager 25, a driver 26, an A/D converter 27 and a gold wire 31.

Detailed Description

The following detailed description will be made with reference to the accompanying drawings and examples, so that how to implement the technical means of the present invention to solve the technical problems and achieve the technical effects can be fully understood and implemented.

The utility model discloses a constant power output type baroceptor, baroceptor 15 (micro-electromechanical sensor)'s silicon vibrating diaphragm and silicon back of the body constitute miniature condenser generally, and the during operation can change atmospheric pressure into the capacitance value change, then handles and control through ASIC chip 20, realizes "atmospheric pressure- - -capacitance value- - -constant power" conversion, exports for load RL through ASIC chip 20.

The utility model comprises a circuit board 19 and a shell 11 covering the circuit board 19, wherein the circuit board 19 is arranged at the opening of the shell 11, and the shell 11 and the circuit board 19 form a covered containing space; the inner surface of the circuit board 19 facing the housing 11 is provided with an air pressure sensor 15, an ASIC chip 20 and a filter capacitor C1, wherein the air pressure sensor 15, the ASIC chip 20 and the filter capacitor C1 are electrically connected with a positive power supply VDD.

The bottom end of the air pressure sensor 15 on the circuit board 19 is provided with a first air guide hole 14 communicated with the air pressure sensor 15; one surface of the shell 11, which is far away from the circuit board 19, is provided with one or more second air guide holes 18, and the first air guide holes 14 and the second air guide holes 18 are arranged in a staggered manner; the first air guide hole 14 is communicated with the air pressure sensor 15 after penetrating through the circuit board 19.

Further, in one embodiment, the output pin of the ASIC chip 20 is connected to a load RL.

The output pin of the air pressure sensor 15 is electrically connected with the input pin of the ASIC chip 20 through a gold wire 31, and the filter capacitor C1 is fixed on the circuit board 19 through solder paste by adopting SMT.

The ASIC chip 20 is externally provided with an encapsulating adhesive 17, and the encapsulating adhesive 17 completely covers and encapsulates the ASIC chip 20 on the circuit board 19.

The outer side of the shell 11 far away from the circuit board 19 is provided with a waterproof net 16 for preventing dust from penetrating, and the waterproof net 16 covers the second air guide hole 18 completely.

Further, in one embodiment, a ring of closed protective and reinforced silicone rubber 12 is disposed on the periphery of the contact end of the air pressure sensor 15 and the circuit board 19, and the circuit board 19 is fixed at the opening at the bottom end of the housing 11 by a ring of solder paste 13 disposed on the outer edge by using an SMT patch.

Further, in one embodiment, the ASIC chip 20 includes a decoder 22, and the decoder 22 of the ASIC chip 20 is connected to the output pin of the air pressure sensor 15 through a gold wire 31; the air pressure sensor 15 is a micro capacitor (micro electro mechanical sensor) which is composed of a silicon diaphragm and a silicon back electrode and can convert air pressure change into capacitance value change; the decoder 22 of the ASIC chip 20 processes and analyzes the received capacitance value change of the air pressure sensor 15 and converts the processed capacitance value change into an electrical signal, and the electrical signal output by the decoder 22 passes through the signal amplifier 23 and then reaches the a/D converter 27. The output end of the controller 24 of the ASIC chip 20 is connected with an LED indicator light, and the LED indicator light displays the working state of the ASIC chip 20.

The signal of the air pressure sensor 15 is transmitted to the decoder 22, then to the a/D converter 27 through the signal amplifier 23, and finally the signal is transmitted to the controller 24 by the a/D converter 27. The controller 24 is connected with the units of the decoder 22, the signal amplifier 23, the constant current and constant voltage manager 25 and the A/D converter 27, and the controller 24 detects and adjusts and controls the units and enables the units to operate stably.

The input end of a controller 24 of the ASIC chip 20 is connected with the signal amplifier 23, and the output end of the controller 24 is connected with a driver 26; the output end OUT of the driver 26 is connected with a load RL; the driver 26 turns on or off the load RL in accordance with a control signal of the controller 24.

The input end of the A/D converter 27 is connected with the signal amplifier 23, the output end of the A/D converter 27 is connected with the controller 24, and the controller 24 realizes the instruction and control of the driver 26.

Further, in one embodiment, the output terminal of the signal amplifier 23 is connected to the a/D converter 27, the a/D converter 27 converts the signal into a digital signal and then is connected to the controller 24, and the output terminal of the controller 24 is connected to the load RL through the driver 26.

The ASIC chip 20 further includes a constant current and constant voltage manager 25, an input terminal of the constant current and constant voltage manager 25 is connected to a positive power supply VDD, an output terminal of the constant current and constant voltage manager 25 is electrically connected to the controller 24 and the driver 26 in the ASIC chip 20, and the constant current and constant voltage manager 25 provides a constant current and constant voltage power supply to the controller 24 and the driver 26. An inductor L1 is connected in parallel between the constant current and constant voltage manager 25 and the positive power supply VDD. The positive power supply VDD is grounded through a filter capacitor C1.

Further, in one embodiment, the air pressure sensor 15 is connected to the positive power supply VDD, the output pin of the air pressure sensor 15 is connected to pin 1 of the ASIC chip 20, and pin 1 of the ASIC chip 20 is the input terminal of the decoder 22; the pin 3 of the ASIC chip 20 is connected with a positive power supply VDD, and the pin 3 of the ASIC chip 20 is connected with a constant current and constant voltage manager 25; the pin 4 of the ASIC chip 20 is connected with the constant current and constant voltage manager 25, the input end of the constant current and constant voltage manager 25 is connected with the inductor L1 through the pin 4, and the other end of the inductor L1 is connected with the positive power supply VDD.

The output end of the constant current and constant voltage manager 25 is electrically connected to each unit in the ASIC chip 20, and the units in the ASIC chip 20 include a decoder 22, a signal amplifier 23, a controller 24, a driver 26, and an a/D converter 27.

Pin 5 of ASIC chip 20 is the output of controller 24, and pin 5 of ASIC chip 20 is connected with the LED pilot lamp, and the LED pilot lamp shows the operating condition of ASIC chip 20.

The pin 6 of the ASIC chip 20 is the output end of the driver 26, and the pin 6 of the ASIC chip 20 is connected with a load RL; pin 2 of ASIC chip 20 is grounded.

The foregoing examples, while indicating only certain preferred embodiments of the invention, are given by way of illustration and description, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as limited to the embodiments shown and described, since other embodiments may be devised without departing from the basic scope thereof, and various modifications may be made by those skilled in the art, which modifications are within the scope of the principles of this invention. It should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the spirit and scope of the present invention, and these changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention, which is to be construed as being limited only by the appended claims. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A constant-power air pressure sensing device, comprising: the circuit board (19) and the shell (11) covering the circuit board, the circuit board (19) is arranged at the opening of the shell (11), and the shell (11) and the circuit board (19) form a covered accommodating space; the circuit board is characterized in that an air pressure sensor (15), an ASIC chip (20) and a filter capacitor C1 are arranged on the inner surface of the circuit board (19) facing the shell (11), the air pressure sensor (15), the ASIC chip (20) and the filter capacitor C1 are electrically connected with a positive power supply VDD, and the positive power supply VDD is grounded after passing through the filter capacitor C1; the output pin of the ASIC chip (20) is connected with a load RL;

the ASIC chip (20) comprises a decoder (22), and the input end of the decoder (22) is connected with the output pin of the air pressure sensor (15); a decoder (22) of the ASIC chip (20) processes and analyzes the received capacitance value change of the air pressure sensor (15), the processed and analyzed capacitance value change is output to an A/D converter (27) through a signal amplifier (23), and finally a signal is transmitted to a controller (24) through the A/D converter (27);

the controller (24) is connected with the driver (26); the output end of the driver (26) is connected with a load RL; the driver (26) controls the load RL according to the electric signal of the controller (24);

the ASIC chip (20) further comprises a constant current and constant voltage manager (25), the input end of the constant current and constant voltage manager (25) is connected with a power supply positive VDD, the output end of the constant current and constant voltage manager (25) is electrically connected with the controller (24) and the driver (26), and an inductor L1 is connected between the constant current and constant voltage manager (25) and the power supply positive VDD in parallel.

2. The constant-power type air pressure sensing device according to claim 1, wherein the signal of the air pressure sensor (15) is transmitted to the decoder (22), passes through the signal amplifier (23) and then to the a/D converter (27);

the input end of the A/D converter (27) is connected with the signal amplifier (23), the A/D converter (27) is connected with the controller (24) after being converted into a digital signal, and the controller (24) realizes the instruction and control of the driver (26); the output end of the controller (24) is connected with a load RL after passing through a driver (26);

the controller (24) is communicated with the decoder (22), the signal amplifier (23), the constant current and constant voltage manager (25) and the A/D converter (27), and the controller (24) detects and adjusts and controls the units and enables the units to work stably.

3. The constant-power type air pressure sensing device according to claim 1, wherein the output pin of the air pressure sensor (15) is connected to pin 1 of the ASIC chip (20), and pin 1 of the ASIC chip (20) is the input terminal of the decoder (22);

a pin 3 of the ASIC chip (20) is connected with a positive power supply VDD, and a pin 3 of the ASIC chip (20) is connected with a constant current and constant voltage manager (25); a pin 4 of the ASIC chip (20) is connected with a constant current and constant voltage manager (25), the input end of the constant current and constant voltage manager (25) is connected with an inductor L1 through the pin 4, and the other end of the inductor L1 is connected with a power supply positive VDD;

a pin 5 of the ASIC chip (20) is an output end of the controller (24), and the pin 5 of the ASIC chip (20) is connected with an LED indicator light;

the pin 6 of the ASIC chip (20) is the output end of the driver (26), and the pin 6 of the ASIC chip (20) is connected with a load RL; pin 2 of the ASIC chip (20) is grounded.

4. The constant-power type air pressure sensing device according to claim 1, wherein the input pin 1 of the decoder (22) of the ASIC chip (20) is connected with the output pin of the air pressure sensor (15) through a gold wire (31);

the filter capacitor C1 is fixed on the circuit board (19) through solder paste by adopting SMT patch.

5. The constant-power air pressure sensing device according to claim 1, wherein a first air vent (14) communicated with the air pressure sensor (15) is formed at the bottom end of the air pressure sensor (15) on the circuit board (19); one surface of the shell (11) far away from the circuit board (19) is provided with one or more second air guide holes (18), and the first air guide holes (14) and the second air guide holes (18) are arranged in a staggered manner; the first air guide hole (14) is communicated with the air pressure sensor (15) after penetrating through the circuit board (19).

6. The constant-power air pressure sensing device according to claim 1, wherein an encapsulating adhesive (17) is disposed outside the ASIC chip (20), and the encapsulating adhesive (17) completely covers and encapsulates the ASIC chip (20) on the circuit board (19);

the outer side of one surface of the shell (11) far away from the circuit board (19) is provided with a waterproof net (16) for preventing dust from permeating, and the waterproof net (16) covers the second air guide hole (18) completely; a circle of closed protective and reinforced silica gel (12) is arranged on the periphery of the contact end of the air pressure sensor (15) and the circuit board (19), and the circuit board (19) is fixed at an opening at the bottom end of the shell (11) through a circle of solder paste (13) arranged on the outer edge by adopting an SMT patch.

7. The constant-power air pressure sensing device according to claim 1, wherein the output end of the constant-current and constant-voltage manager (25) is electrically connected with each unit in the ASIC chip (20), and the units in the ASIC chip (20) comprise a decoder (22), a signal amplifier (23), a controller (24), a driver (26) and an A/D converter (27).