1. The gravity detection sensor is characterized by comprising a shielding case (1), wherein a metal deformation body (2) and a circuit board (3) are arranged in the shielding case (1), the metal deformation body (2) is pasted with a Wheatstone strain gage (4) through epoxy AB glue, and the Wheatstone strain gage (4) comprises a Wheatstone bridge formed by four resistors;

the circuit board (3) is provided with a sensor power pin (5), a signal positive pin (6), a sensor grounding pin (7) and a signal negative pin (8); a first corner of the Wheatstone bridge is electrically connected with the sensor power pin (5), a second corner of the Wheatstone bridge is electrically connected with the signal positive pin (6), a third corner of the Wheatstone bridge is electrically connected with the sensor grounding pin (7), and a fourth corner of the Wheatstone bridge is electrically connected with the signal negative pin (8);

the circuit board (3) is further provided with a channel selector (9), a preamplifier (10), an analog-to-digital converter (11) and a digital filter (12), the signal positive pin (6) and the signal negative pin (8) are electrically connected with the channel selector (9), the channel selector (9) is electrically connected with the preamplifier (10), the preamplifier (10) is electrically connected with the analog-to-digital converter (11), and the analog-to-digital converter (11) is electrically connected with the digital filter (12).

2. A gravity detection sensor according to claim 1, wherein the circuit board (3) further integrates a temperature sensor (13), the temperature sensor (13) is electrically connected to the channel selector (9), the temperature sensor (13) is used for temperature compensation of the gravity detection sensor;

the circuit board (3) is provided with a temperature measurement selection pin, and the temperature measurement selection pin is electrically connected with a temperature measurement diode (14).

3. A gravity detection sensor according to claim 1, wherein the circuit board (3) further integrates a communication module (15), a digital calibrator (16) and a buffer (17), the digital filter (12) is electrically connected to the digital calibrator (16), the digital calibrator (16) is electrically connected to the buffer (17), and the buffer (17) is electrically connected to the communication module (15).

4. A gravity detection sensor according to claim 3, characterized in that the communication module (15) is adapted to intelligently monitor the pressure signal via I2C or SPI communication protocol, and the communication module (15) is adapted to control peripheral equipment via the monitored pressure signal.

5. A gravity sensing sensor according to claim 3, characterized in that the communication module (15) has a clock pin (18), a data pin (19), an address selection pin (20) and a communication selection pin (22) integrated on the circuit board (3).

6. A gravity sensing sensor according to claim 1, wherein the circuit board (3) further integrates a voltage regulator (26), the voltage regulator (26) having a power pin and a ground pin integrated on the circuit board (3).

7. A gravity sensing sensor according to claim 1, wherein the circuit board (3) further integrates a hard break comparison valve (23), the hard break comparison valve (23) is used for monitoring and comparing the pressure output variable of the wheatstone strain gage (4) to actively provide a pull-up voltage to the main control system for main system wake-up.

8. A gravity detection sensor according to claim 1, wherein the circuit board (3) further integrates an oscillator (24), the oscillator (24) being adapted to repeatedly generate a gravity electronic signal;

the circuit board (3) is further integrated with a disposable editable memory (25), and the disposable editable memory (25) is burnt with the trigger range and the trigger time of the gravity detection sensor.

9. A gravity sensing sensor according to claim 1, wherein the circuit board (3) further integrates a charge pump (21), the charge pump (21) being adapted to generate a higher pulsed voltage output with a lower input voltage.

10. The gravity detection sensor according to claim 1, wherein the metal deformation body (2) is made of copper, aluminum, steel or alloy steel.

Background

The gravity detection sensor is realized by utilizing a piezoelectric effect, a heavy object and a piezoelectric sheet in the sensor are integrated together, and the horizontal direction is calculated through the voltage generated in two orthogonal directions. The piezoelectric effect is that external force applied to the crystal by a heteropolar crystal without a symmetric center not only deforms the crystal but also changes the polarization state of the crystal, and an electric field is established in the crystal, and the phenomenon that the medium is polarized due to mechanical force action is called as positive piezoelectric effect. The method is mainly applied to intelligent switching of horizontal and vertical screens of the mobile phone; shooting the direction of the picture; gravity-sensitive games such as a balance ball, a racing game, etc.

At present, sensors for detecting mechanics on the market are generally realized by piezoelectric films, materials comprise constantan and polyurethane, mv/v signals are output, subsequent operational amplifier zero setting and linear adjustment are needed by users, the size is large, and non-professional users have great difference in the adjustment and understanding of the sensors. The use flexibility is poor, the power consumption is large, the performance can not be guaranteed, the batch production is not facilitated, and the requirement of high use precision of a user can not be met.

Disclosure of Invention

Therefore, the gravity detection sensor provided by the invention achieves the purposes of being flexible to use, saving energy, reducing power consumption, not sacrificing performance, facilitating batch production and meeting the requirement of high precision of use of a user.

In order to achieve the above purpose, the invention provides the following technical scheme: a gravity detection sensor comprises a shielding case, wherein a metal deformation body and a circuit board are arranged in the shielding case, a Wheatstone strain gauge is pasted on the metal deformation body through epoxy AB glue, and the Wheatstone strain gauge comprises a Wheatstone bridge formed by four resistors;

the circuit board is provided with a sensor power pin, a signal positive pin, a sensor grounding pin and a signal negative pin; a first corner of the Wheatstone bridge is electrically connected with the sensor power pin, a second corner of the Wheatstone bridge is electrically connected with the signal positive pin, a third corner of the Wheatstone bridge is electrically connected with the sensor grounding pin, and a fourth corner of the Wheatstone bridge is electrically connected with the signal negative pin;

the circuit board is further provided with a channel selector, a preamplifier, an analog-to-digital converter and a digital filter, the signal positive pin and the signal negative pin are electrically connected with the channel selector, the channel selector is electrically connected with the preamplifier, the preamplifier is electrically connected with the analog-to-digital converter, and the analog-to-digital converter is electrically connected with the digital filter.

As a preferable scheme of the gravity detection sensor, the circuit board is further integrated with a temperature sensor, the temperature sensor is electrically connected with the channel selector, and the temperature sensor is used for performing temperature compensation on the gravity detection sensor;

the circuit board is provided with a temperature measurement selection pin, and the temperature measurement selection pin is electrically connected with a temperature measurement diode.

As a preferable scheme of the gravity detection sensor, the circuit board is further integrated with a communication module, a digital calibrator and a buffer, the digital filter is electrically connected with the digital calibrator, the digital calibrator is electrically connected with the buffer, and the buffer is electrically connected with the communication module.

As a preferable scheme of the gravity detection sensor, the communication module controls the pressure signal to perform intelligent monitoring through an I2C or SPI communication protocol, and the communication module controls the peripheral equipment through the monitored pressure signal.

As a preferable scheme of the gravity detection sensor, the communication module has a clock pin, a data pin, an address selection pin and a communication selection pin which are integrated on a circuit board.

Preferably, the circuit board further integrates a voltage regulator having a power pin and a ground pin integrated on the circuit board.

As a preferred scheme of the gravity detection sensor, the circuit board is further integrated with a hard interrupt comparison valve, and the hard interrupt comparison valve is used for monitoring and comparing pressure output variables of the wheatstone strain gauge so as to actively provide a high-pulling voltage for the main control system to wake up the main system.

As a preferable scheme of the gravity detection sensor, the circuit board is further integrated with an oscillator, and the oscillator is used for repeatedly generating gravity electronic signals;

the circuit board is further integrated with a disposable editable memory, and the disposable editable memory is burnt with the triggering range and the triggering time of the gravity detection sensor.

As a preferred solution of the gravity detection sensor, the circuit board further integrates a charge pump for generating a higher pulse voltage output by a lower input voltage.

Preferably, the metal deformation body is made of copper, aluminum, steel or alloy steel.

The invention has the following advantages: the device is provided with a shielding cover, a metal deformation body and a circuit board are arranged in the shielding cover, the metal deformation body is pasted with a Wheatstone strain gauge through epoxy AB glue, and the Wheatstone strain gauge comprises a Wheatstone bridge formed by four resistors; the circuit board is provided with a sensor power pin, a signal positive pin, a sensor grounding pin and a signal negative pin; a first corner of the Wheatstone bridge is electrically connected with a power pin of the sensor, a second corner of the Wheatstone bridge is electrically connected with a positive signal pin, a third corner of the Wheatstone bridge is electrically connected with a grounding pin of the sensor, and a fourth corner of the Wheatstone bridge is electrically connected with a negative signal pin; the circuit board is also provided with a channel selector, a preamplifier, an analog-to-digital converter and a digital filter, wherein the signal positive pin and the signal negative pin are electrically connected with the channel selector, the channel selector is electrically connected with the preamplifier, the preamplifier is electrically connected with the analog-to-digital converter, and the analog-to-digital converter is electrically connected with the digital filter. The invention can realize the highly integrated gravity measurement of active, independent and interval subsystems, and reduce the working cycle frequency and cycle of the system set, thereby improving the use flexibility of the whole system, having good energy-saving effect and low power consumption, not sacrificing performance, being greatly convenient for the batch production of the sensor, and meeting the requirement of high use precision of users.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the present invention, and do not limit the conditions for implementing the present invention, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the functions and purposes of the present invention, should still fall within the scope of the present invention.

FIG. 1 is an exploded view of a gravity sensing sensor according to an embodiment of the present invention;

fig. 2 is a schematic circuit diagram of a gravity detection sensor according to an embodiment of the present invention.

In the figure, 1, a shield case; 2. a metal deformation body; 3. a circuit board; 4. a Wheatstone strain gauge; 5. a sensor power pin; 6. a signal positive pin; 7. a sensor ground pin; 8. a signal negative pin; 9. a channel selector; 10. a preamplifier; 11. an analog-to-digital converter; 12. a digital filter; 13. a temperature sensor; 14. a temperature measuring diode; 15. a communication module; 16. a digital calibrator; 17. a buffer; 18. a clock pin; 19. a data pin; 20. an address selection pin; 21. a charge pump; 22. a communication selection pin; 23. a hard interrupt compare valve; 24. an oscillator; 25. a one-time editable memory.

Detailed Description

The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 and 2, a gravity detection sensor is provided, which includes a shielding case 1, a metal deformation body 2 and a circuit board 3 are arranged inside the shielding case 1, the metal deformation body 2 is pasted with a wheatstone strain gage 4 through epoxy AB glue, and the wheatstone strain gage 4 includes a wheatstone bridge formed by four resistors;

the circuit board 3 is provided with a sensor power pin 5, a signal positive pin 6, a sensor grounding pin 7 and a signal negative pin 8; a first corner of the wheatstone bridge is electrically connected with the sensor power pin 5, a second corner of the wheatstone bridge is electrically connected with the signal positive pin 6, a third corner of the wheatstone bridge is electrically connected with the sensor grounding pin 7, and a fourth corner of the wheatstone bridge is electrically connected with the signal negative pin 8;

the circuit board 3 is further provided with a channel selector 9, a preamplifier 10, an analog-to-digital converter 11 and a digital filter 12, the signal positive pin 6 and the signal negative pin 8 are electrically connected with the channel selector 9, the channel selector 9 is electrically connected with the preamplifier 10, the preamplifier 10 is electrically connected with the analog-to-digital converter 11, and the analog-to-digital converter 11 is electrically connected with the digital filter 12.

In this embodiment, the circuit board 3 further integrates a temperature sensor 13, the temperature sensor 13 is electrically connected to the channel selector 9, and the temperature sensor 13 is configured to perform temperature compensation on the gravity detection sensor; the circuit board 3 has a temperature measurement selection pin, which is electrically connected to a temperature measurement diode 14. The circuit board 3 is further integrated with a communication module 15, a digital calibrator 16 and a buffer 17, the digital filter 12 is electrically connected with the digital calibrator 16, the digital calibrator 16 is electrically connected with the buffer 17, and the buffer 17 is electrically connected with the communication module 15. The communication module 15 controls the pressure signal to perform intelligent monitoring through an I2C or SPI communication protocol, and the communication module 15 controls peripheral equipment through the monitored pressure signal.

In this embodiment, the communication module 15 has a clock pin 18, a data pin 19, an address selection pin 20, and a communication selection pin 22 integrated on the circuit board 3. The circuit board 3 also has integrated therein a voltage regulator 26, the voltage regulator 26 having a power pin and a ground pin integrated on the circuit board 3. The circuit board 3 is further integrated with a hard interrupt comparison valve 23, and the hard interrupt comparison valve 23 is used for monitoring and comparing the pressure output variable of the Wheatstone strain gage 4 so as to actively provide a high-voltage for the main control system to wake up the main system.

In this embodiment, the circuit board 3 further integrates an oscillator 24, and the oscillator 24 is used for repeatedly generating a gravity electronic signal; the circuit board 3 is further integrated with a one-time editable memory 25, and the one-time editable memory 25 is burned with the trigger range and the trigger time of the gravity detection sensor. The circuit board 3 also integrates a charge pump 21, the charge pump 21 being used to generate a higher pulsed voltage output from a lower input voltage.

Specifically, the present invention uses a piezoelectric film with four resistors etched with a wheatstone bridge as a first area circuit, a conditioning chip with pressure linearity, zero point, temperature compensation, hard interrupt control, and other functions as a second area circuit, and a voltage regulator 26 for simultaneously outputting an analog signal and a digital signal with an amplification function as a third area circuit.

The Wheatstone bridge signal with metal strain film is amplified and processed in multiple stages, and the output function may be used flexibly in application, and when the main system is in sleep, the intermittent power supply mode and output force signal mode in the second area are compared via internal configured threshold value to monitor and compare the pressure output variable of the pressure core in the first area to provide the main system with high voltage to wake up the main system.

Specifically, structurally, the technology of adhesive and semiconductor packaging is adopted, and preferably, when the structure of the metal deformation body 2 is designed, the accuracy of a force signal is not influenced when a user guarantees installation, and the metal deformation body 2 is designed into an inner counter bore. Through designing dual control system, can carry out function control to second district and third district in step simultaneously, reach safer effect.

The invention designs energy-saving control in the circuit, designs intermittent stable power input and intermittent output mode in the second area circuit chip, and can quickly and fully read the pressure signal and ensure the minimization of power consumption. The interior of the second area circuit can be configured with flexible active acquisition signals when the system is powered on, and the time can be selected according to application requirements.

In one embodiment of the gravity detection sensor, the circuit board 3 is designed to be electromagnetically interference-proof, and the magnetic field noise signals in the metal cover are processed, so that the influence of unclean signals on the system precision is avoided, and the application in severe environment is improved. In addition, the bottom of the circuit board 3 is perforated, the outer wall of the circuit board simultaneously keeps the wire outlet design, the wire diameter is in the range of 0.1-2mm, and the installation requirements of users from the bottom and the side face are greatly met.

With reference to fig. 2, the gravity sensor is fabricated as follows:

firstly, a Wheatstone strain gage 4 is pasted on a metal deformation body 2 (copper, aluminum, steel or alloy steel) by dripping AB epoxy glue, the deformation thickness of the metal deformation body 2 is calculated by the existing mechanical simulation software, and then the metal deformation body is integrally fixed through multiple times of high-temperature curing;

secondly, leading out the input and output pads on the strain film by a metal wire leading-out technology by using a standard ferrochrome welding method for the semi-finished product in the first step, and connecting the input and output pads with a PCBA at the bottom according to a schematic diagram;

thirdly, regularly coating glue required for fixing the metal shielding case 1 on the periphery of the bottom of the metal deformable body 2 by using spraying equipment;

fourthly, fixing the circuit board 3 with the mounted components on the first metal deformation body 2 coated with the bonding glue;

fifthly, baking the fourth semi-finished product at high temperature, and fixing the position;

and sixthly, completing the packaging of the product and carrying out performance test.

The invention is provided with a shielding case 1, a metal deformation body 2 and a circuit board 3 are arranged in the shielding case 1, the metal deformation body 2 is pasted with a Wheatstone strain gage 4 through epoxy AB glue, and the Wheatstone strain gage 4 comprises a Wheatstone bridge formed by four resistors; the circuit board 3 is provided with a sensor power pin 5, a signal positive pin 6, a sensor grounding pin 7 and a signal negative pin 8; a first corner of the Wheatstone bridge is electrically connected with a sensor power supply pin 5, a second corner of the Wheatstone bridge is electrically connected with a signal positive pin 6, a third corner of the Wheatstone bridge is electrically connected with a sensor grounding pin 7, and a fourth corner of the Wheatstone bridge is electrically connected with a signal negative pin 8; the circuit board 3 is further provided with a channel selector 9, a preamplifier 10, an analog-to-digital converter 11 and a digital filter 12, the signal positive pin 6 and the signal negative pin 8 are electrically connected with the channel selector 9, the channel selector 9 is electrically connected with the preamplifier 10, the preamplifier 10 is electrically connected with the analog-to-digital converter 11, and the analog-to-digital converter 11 is electrically connected with the digital filter 12. The invention can realize the highly integrated gravity measurement of active, independent and interval subsystems, and reduce the working cycle frequency and cycle of the system set, thereby improving the use flexibility of the whole system, having good energy-saving effect and low power consumption, not sacrificing performance, being greatly convenient for the batch production of the sensor, and meeting the requirement of high use precision of users.

Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.