CN215986135U - A2B triaxial vibration sensor assembly - Google Patents

Abstract

The utility model discloses an A2B triaxial vibration sensor assembly, which comprises a plurality of triaxial acceleration sensors and an A2B digital processing chip, wherein the triaxial acceleration sensors are in communication connection with the A2B digital processing chip, and each triaxial acceleration sensor at least comprises a vibration signal pickup module for picking up vibration signals, a vibration signal conversion module for converting the picked vibration signals into electric signals and a signal emission module for emitting the converted electric signals to the A2B digital processing chip. The vibration signal obtained by the utility model has wide frequency response range and low cost, and the I2S digital interface of the triaxial acceleration sensor can be directly matched with the A2B digital processing chip, so that the intermediate vibration signal analog-to-digital conversion link is reduced, the interference resistance can be effectively realized in a vibration signal transmission loop, the attenuation of the vibration signal is reduced, and the vibration signal measurement accuracy can be effectively improved.

Description

A2B triaxial vibration sensor assembly

Technical Field

The utility model relates to the technical field of A2B triaxial vibration sensors, in particular to an A2B triaxial vibration sensor assembly.

Background

With the development of automobile technology, people rely on household automobiles, the requirements on the use environment of the automobiles are higher and higher, and a quiet driving space is more and more urgent. The mature active noise reduction ANC & RNC noise reduction technical algorithm is widely popularized and applied to noise reduction products. The car microphone picks up the space noise to make ANC noise reduction, generally adopts A2B box to pick up the vibration signal of the vibration noise that tire and road surface produced, and feeds back this vibration signal to A2B bus chip in A2B box, and A2B bus chip carries out noise reduction to the vibration signal processing.

The A2B box on the market at present adopts the A2B bus chip of ADI company to carry on ADI's digital accelerometer ADXL317 to pick up the audio signal, the effective frequency response range that this kind of mode obtained is little, and is with high costs, and need carry out module conversion to the vibration signal in the vibration signal transmission process between A2B bus chip and the digital accelerometer ADXL317, receive the interference easily in the vibration signal transmission return circuit, and lead to the vibration signal decay, has influenced the accuracy that the vibration signal measured.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an A2B triaxial vibration sensor assembly, which has the advantages that the obtained vibration signal frequency response range is wide, the cost is low, an I2S digital interface of a triaxial acceleration sensor can be directly matched with an A2B digital processing chip, the intermediate vibration signal analog-to-digital conversion link is reduced, the interference resistance can be effectively realized in a vibration signal transmission loop, the attenuation of a vibration signal is reduced, the vibration signal measurement accuracy can be effectively improved, and the problems brought forward by the technical background are solved.

In order to achieve the purpose, the utility model provides the following technical scheme: A2B triaxial vibration sensor assembly comprises a triaxial acceleration sensor and an A2B digital processing chip, wherein the triaxial acceleration sensor is provided with a plurality of sensors, the triaxial acceleration sensors are in communication connection with the A2B digital processing chip and are used for picking up vibration signals of three axial directions of an automobile, each triaxial acceleration sensor at least comprises a vibration signal picking module for picking up the vibration signals, a vibration signal conversion module for converting the picked vibration signals into electric signals and a signal transmitting module for transmitting the converted electric signals to the A2B digital processing chip, the A2B digital processing chip is used for receiving the electric signals sent by the triaxial acceleration sensor and encoding the electric signals into an A2B signal protocol, and the A2B digital processing chip is also connected with an A2B signal receiving circuit for receiving the A2B signal protocol and an A2B signal transmitting circuit for transmitting the A2B signal protocol to A2B signal receiver of the upper stage An electrical circuit.

Preferably, the type of the three-axis acceleration sensor is AIS25BATR, the measuring range of the three-axis acceleration sensor is +/-3.85 g or +/-7.7 g, and the sum of the picked acceleration frequency is 1HZ-2.4 Khz.

Preferably, the model of the A2B digital processing chip is AD2428WCCSZ, and the A2B digital processing chip is electrically connected with peripheral circuits and a power supply circuit.

Preferably, the peripheral circuit is composed of a capacitor C8, a capacitor C9, a capacitor C19, a capacitor C20, a capacitor C21, an inductor L8, an inductor L10 and a schottky diode, wherein one end of the capacitor C8 and the capacitor C9 is connected to the connection terminal CN200, the other end of the capacitor C8 and the capacitor C9 is connected to the A2B signal receiving circuit, the capacitor C8 and the capacitor C9 isolate direct current on the A2B signal receiving circuit from an A2B signal, the capacitor C19 and the capacitor C20 isolate direct current on the A2B signal transmitting circuit from an A2B signal, the inductor L8 and the inductor L10 are used for separating direct current on the power supply circuit, the capacitor C21 performs high frequency filtering on the direct current separated from the power supply circuit, and the schottky diode supplies the direct current after the high frequency filtering to a pin No. 30 of the A2B digital processing chip.

Preferably, the power supply circuit is composed of an inductor L1, an inductor L3, a capacitor C11 and a field effect transistor Q1, wherein one end of the inductor L1 and one end of the inductor L3 are connected to a power supply through a connection terminal CN200, the other end of the inductor L1 and the other end of the inductor L3 are connected to the A2B signal receiving circuit, and the field effect transistor Q1 controls on and off of the power supply.

Preferably, the A2B signal receiving circuit is composed of an inductor L2, an inductor L4, an inductor L5, a capacitor C4, a capacitor C6, a capacitor C15, a capacitor C18, a capacitor C31, a capacitor C10, a resistor R5, and a resistor R7, wherein one end of the inductor L4 and one end of the inductor L5 are connected to the inductor L2, the other end of the inductor L4 are connected to pins 23 and 22 of the A2B digital processing chip, the capacitor C4, the capacitor C6, and the capacitor C10 are connected in series, the capacitor C15 and the capacitor C18 are connected in parallel, one end of the capacitor C31 is grounded, the other end of the capacitor C31 is connected to the inductor L2, the inductor L5, and the capacitor C18, and the resistor R5 and the resistor R7 are connected to the inductor L2.

Preferably, the A2B signal transmitting circuit is composed of an inductor L6, an inductor L7, an inductor L9, a capacitor C23, a capacitor C24, a capacitor C25, a capacitor C26, a capacitor C34, a capacitor C35, a resistor R11 and a resistor R14, wherein one end of the inductor L6 and one end of the inductor L7 are connected to the inductor L9, the other end of the inductor L6 and the other end of the inductor L7 are connected to pins No. 18 and 19 of the A2B digital processing chip respectively, the capacitor C23 and the capacitor C34 are connected in parallel, two ends of the capacitor C23 and the capacitor C34 are connected to the inductor L6 and the inductor L7, the capacitor C24, the capacitor C25, the capacitor C26 and the capacitor C35 are connected in series, and the resistor R11 and the resistor R14 are connected in series and then connected to the inductor L9.

Preferably, the electrical signal is a TDM signal in I2S format.

Preferably, the A2B signal receiver is connected with the A2B digital processing chip in a communication way through a twisted pair.

Compared with the prior art, the utility model has the following beneficial effects:

1. the utility model provides an A2B triaxial vibration sensor assembly, which comprises a triaxial acceleration sensor and an A2B digital processing chip, wherein the model of the triaxial acceleration sensor is AIS25BATR, the model of the A2B digital processing chip is AD2428WCCSZ, and an I2S digital interface of the triaxial acceleration sensor can be directly matched with the A2B digital processing chip, so that intermediate vibration signal analog-to-digital conversion links are reduced, interference resistance can be effectively realized in a vibration signal transmission loop, vibration signal attenuation can be reduced, and the accuracy of vibration signal measurement can be effectively improved.

2. The triaxial acceleration sensor at least comprises a vibration signal pickup module, a vibration signal conversion module and a signal emission module, wherein the vibration signal pickup module is used for picking up vibration signals, the vibration signal conversion module is used for converting the picked-up vibration signals into TDM data in an I2S format, the signal emission module transmits the converted TDM data to an A2B digital processing chip for data processing and analysis, and compared with a traditional digital accelerometer ADXL317, the triaxial acceleration sensor has the advantages of wide frequency response range of the obtained vibration signals, low cost and high popularization and application value.

Drawings

FIG. 1 is a schematic block diagram of the present invention;

FIG. 2 is a schematic circuit diagram of a three-axis acceleration sensor of the present invention;

FIG. 3 is a schematic circuit diagram of the A2B digital processing chip of the present invention.

The reference numerals and names in the figures are as follows:

1. a three-axis acceleration sensor; 11. a vibration signal pickup module; 12. a vibration signal conversion module; 13. a signal transmitting module; 2. A2B digital processing chip; 21. A2B signal receiving circuit; 22. A2B signal transmitting circuit; 23. a peripheral circuit; 24. a power supply circuit; 3. A2B signal receiver; 4. a twisted pair.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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, an embodiment of the present invention: an A2B triaxial vibration sensor assembly comprises a triaxial acceleration sensor 1 and an A2B digital processing chip 2, wherein the triaxial acceleration sensor 1 is provided with a plurality of triaxial acceleration sensors 1, the plurality of triaxial acceleration sensors 1 are all in communication connection with the A2B digital processing chip 2, and the plurality of triaxial acceleration sensors 1 are all used for picking up vibration signals of three axial directions of an automobile, each triaxial acceleration sensor 1 at least comprises a vibration signal picking module 11 for picking up vibration signals, a vibration signal conversion module 12 for converting the picked-up vibration signals into electric signals, and a signal emission module 13 for emitting the converted electric signals to the A2B digital processing chip 2, the electric signals are TDM signals in an I2S format, the A2B digital processing chip 2 is used for receiving the electric signals sent by the triaxial acceleration sensor 1 and encoding the electric signals into an A2B signal protocol, the A2B digital processing chip 2 is also connected with an A2B signal receiving circuit 21 for receiving an A2B signal protocol and an A2B signal transmitting circuit 22 for transmitting the A2B signal protocol to a previous A2B signal receiver 3, the A2B signal receiver 3 is in communication connection with the A2B digital processing chip 2 through a twisted pair 4, and the A2B digital processing chip 2 is also electrically connected with a peripheral circuit 23 and a power supply circuit 24.

Referring to fig. 2, the IC1 in the drawing is the three-axis acceleration sensor 1, which is of the type AIS25BATR, the measurement range of the three-axis acceleration sensor 1 of the type is ± 3.85g or ± 7.7g, the sum of the picked-up acceleration frequency amounts is 1HZ to 2.4Khz, the error of the vibration signal pickup in the frequency range is ± 3DBFS, the sensitivity is ± 11.71DBFS/g, compared with the conventional digital accelerometer ADXL317, the obtained vibration signal frequency response range is wide and the cost is low, the IC1 has 14 pins in common, among which, the pins 3, 4, 5 and 7 are I2S signal pins, which are connected to the pins 8, 10, 11 and 14 of the digital processing chip 2 A2B, respectively, and the pins 1 and 2 of the IC1 are control pins, which are connected to the pins 4 and 5 of the digital processing chip 2 A2B through the resistor R6 and the resistor R10, respectively.

Referring to fig. 3, U1 in the figure is the above A2B digital processing chip 2, the model of the A2B digital processing chip 2 is AD2428WCCSZ, the A2B digital processing chip 2 of the model can receive and transmit TDM signals, and can receive A2B signals sent by the next stage A2B signal receiver 3 through pin No. 22 and pin No. 23, and transmit A2B signals to the previous stage A2B signal receiver 3 through pin No. 18 and pin No. 19.

Referring to fig. 3 again, the A2B signal receiving circuit 21 in the figure is composed of an inductor L2, an inductor L4, an inductor L5, a capacitor C4, a capacitor C6, a capacitor C15, a capacitor C18, a capacitor C31, a capacitor C10, a resistor R5, and a resistor R7, wherein one end of the inductor L4 and the inductor L5 is connected to the inductor L2, the other end of the inductor L5 is connected to pins 23 and 22 of the A2B digital processing chip 2, the capacitor C4, the capacitor C6, and the capacitor C10 are connected in series, the capacitor C15 and the capacitor C18 are connected in parallel, one end of the capacitor C31 is grounded, the other end of the capacitor C31 is connected to the inductor L2, the inductor L5, and the capacitor C18, and the resistor R5 and the resistor R7 are connected to the inductor L2.

Referring to fig. 3 again, in the diagram, the A2B signal transmitting circuit 22 is composed of an inductor L6, an inductor L7, an inductor L9, a capacitor C23, a capacitor C24, a capacitor C25, a capacitor C26, a capacitor C34, a capacitor C35, a resistor R11 and a resistor R14, wherein one end of the inductor L6 and one end of the inductor L6 are connected to the inductor L6, the other end of the inductor L6 are connected to pins 18 and 19 of the A2 6 digital processing chip 2, the capacitor C6 and the capacitor C6 are connected in parallel, two ends of the capacitor C6 and the capacitor C6 are connected to the inductor L6 and the inductor L6, the capacitor C6 and the capacitor C6 are connected in series, and the resistor R6 is connected to the inductor L6 after being connected in series.

Referring to fig. 3 again, the peripheral circuit 23 in the figure is composed of a capacitor C8, a capacitor C9, a capacitor C19, a capacitor C20, a capacitor C21, an inductor L8, an inductor L10, and a schottky diode, wherein one end of the capacitor C8 and the capacitor C9 is connected to the connection terminal CN200, the other end of the capacitor C8 and the capacitor C9 is connected to the A2B signal receiving circuit 21, the capacitor C8 and the capacitor C9 isolate direct current in the A2B signal receiving circuit 21 from an A2B signal, the capacitor C19 and the capacitor C20 isolate direct current in the A2B signal transmitting circuit 22 from an A2B signal, the inductor L8 and the inductor L10 are used for separating direct current in the power supply circuit 24, the capacitor C21 high-frequency filters direct current separated from the power supply circuit 24, and the schottky diode supplies the high-frequency filtered direct current to a 30 pin of the A2B digital processing chip 2.

Referring to fig. 3 again, the power supply circuit 24 in the figure is composed of an inductor L1, an inductor L3, a capacitor C11, and a fet Q1, wherein one end of the inductor L1 and one end of the inductor L3 are connected to the power supply through a connection terminal CN200, the other end of the inductor L1 is connected to the A2B signal receiving circuit 21, and the fet Q1 controls the power supply to be turned on or off.

In summary, the A2B triaxial vibration sensor assembly in the present invention is composed of a triaxial acceleration sensor 1 and A2B digital processing chip 2, wherein the model adopted by the triaxial acceleration sensor 1 is AIS25BATR, the model adopted by the A2B digital processing chip 2 is AD2428WCCSZ, and the I2S digital interface of the triaxial acceleration sensor 1 can be directly matched with the A2B digital processing chip 2, so as to reduce the intermediate vibration signal analog-to-digital conversion link, effectively resist interference in a vibration signal transmission loop, reduce the attenuation of vibration signals, and effectively improve the accuracy of vibration signal measurement.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (9)

1. An A2B triaxial vibration sensor assembly characterized in that: the automobile three-axis acceleration sensor comprises a three-axis acceleration sensor (1) and an A2B digital processing chip (2), wherein the three-axis acceleration sensor (1) is provided with a plurality of three-axis acceleration sensors (1), the three-axis acceleration sensors (1) are in communication connection with the A2B digital processing chip (2), the three-axis acceleration sensors (1) are used for picking up vibration signals of three axial directions of an automobile, each three-axis acceleration sensor (1) at least comprises a vibration signal picking module (11) for picking up the vibration signals, a vibration signal conversion module (12) for converting the picked-up vibration signals into electric signals and a signal transmitting module (13) for transmitting the converted electric signals to the A2B digital processing chip (2), the A2B digital processing chip (2) is used for receiving the electric signals sent by the three-axis acceleration sensor (1) and encoding the electric signals into an A2B signal protocol, the A2B digital processing chip (2) is also connected with an A2B signal receiving circuit (21) for receiving an A2B signal protocol and an A2B signal transmitting circuit (22) for transmitting the A2B signal protocol to a previous A2B signal receiver (3).

2. The A2B triaxial vibration sensor assembly of claim 1, wherein: the model of the triaxial acceleration sensor (1) is AIS25BATR, the measuring range of the triaxial acceleration sensor (1) is +/-3.85 g or +/-7.7 g, and the sum of the picked acceleration frequency is 1HZ-2.4 Khz.

3. The A2B triaxial vibration sensor assembly of claim 1, wherein: the model of the A2B digital processing chip (2) is AD2428WCCSZ, and the A2B digital processing chip (2) is also electrically connected with a peripheral circuit (23) and a power supply circuit (24).

4. The A2B triaxial vibration sensor assembly of claim 3, wherein: the peripheral circuit (23) is composed of a capacitor C8, a capacitor C9, a capacitor C19, a capacitor C20, a capacitor C21, an inductor L8, an inductor L10 and a schottky diode, wherein one end of the capacitor C8 and the capacitor C9 is connected with the connection terminal CN200, the other end of the capacitor C3875 and the capacitor C9 is connected with the A2B signal receiving circuit (21), the capacitor C8 and the capacitor C9 isolate direct current on the A2B signal receiving circuit (21) from an A2B signal, the capacitor C19 and the capacitor C20 isolate direct current on the A2B signal transmitting circuit (22) from an A2B signal, the inductor L8 and the inductor L10 are used for separating direct current on the power supply circuit (24), the capacitor C21 is used for high-frequency filtering the direct current separated from the power supply circuit (24), and the schottky diode supplies the high-frequency filtered direct current to a 30 pin of the A2B digital processing chip (2).

5. The A2B triaxial vibration sensor assembly of claim 3, wherein: the power supply circuit (24) is composed of an inductor L1, an inductor L3, a capacitor C11 and a field effect transistor Q1, wherein one end of the inductor L1 and one end of the inductor L3 are connected with a power supply through a connection terminal CN200, the other end of the inductor L1 and the other end of the inductor L3 are connected with the A2B signal receiving circuit (21), and the field effect transistor Q1 controls the on and off of the power supply.

6. The A2B triaxial vibration sensor assembly of claim 1, wherein: the A2B signal receiving circuit (21) is composed of an inductor L2, an inductor L4, an inductor L5, a capacitor C4, a capacitor C6, a capacitor C15, a capacitor C18, a capacitor C31, a capacitor C10, a resistor R5 and a resistor R7, wherein one end of the inductor L4 and one end of the inductor L5 are connected with the inductor L2, the other end of the inductor L4 are respectively connected with pins 23 and 22 of the A2B digital processing chip (2), the capacitor C4, the capacitor C6 and the capacitor C10 are connected in series, the capacitor C15 and the capacitor C18 are connected in parallel, one end of the capacitor C31 is grounded, the other end of the capacitor C31 is respectively connected with the inductor L2, the inductor L5 and the capacitor C18, and the resistor R5 and the resistor R7 are respectively connected with the inductor L2.

7. The A2B triaxial vibration sensor assembly of claim 1, wherein: the A2B signal transmitting circuit (22) is composed of an inductor L6, an inductor L7, an inductor L9, a capacitor C23, a capacitor C24, a capacitor C25, a capacitor C26, a capacitor C34, a capacitor C35, a resistor R11 and a resistor R14, wherein one ends of the inductor L6 and the inductor L7 are connected with the inductor L9, the other ends of the inductor L6 and the inductor L7 are respectively connected with pins 18 and 19 of the A2B digital processing chip (2), the capacitor C23 and the capacitor C34 are connected in parallel, two ends of the capacitor C23 and the capacitor C34 are connected with the inductor L6 and the inductor L7, the capacitor C24, the capacitor C25, the capacitor C26 and the capacitor C35 are connected in series, and the resistor R11 and the resistor R14 are connected in series and then connected with the inductor L9.

8. The A2B triaxial vibration sensor assembly of claim 1, wherein: the electrical signal is a TDM signal in I2S format.

9. The A2B triaxial vibration sensor assembly of claim 1, wherein: the A2B signal receiver (3) is in communication connection with the A2B digital processing chip (2) through a twisted pair (4).

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