IEPE sensor conditioning circuit and acceleration acquisition device with same

Abstract

The utility model discloses an IEPE sensor conditioning circuit and an acceleration acquisition device with the same. The IEPE sensor conditioning circuit comprises a constant current source circuit, a sensor interface circuit and a signal scaling circuit, the constant current source circuit is electrically connected with the input end of the signal scaling circuit through the sensor interface circuit, the sensor interface circuit is further electrically connected with the IEPE sensor, and the output end of the signal scaling circuit is electrically connected with an external signal receiving end. On one hand, the constant current source circuit is used for supplying power to the IEPE sensor, and stable and continuous current supply is provided; on the other hand, the signal scaling circuit is used for scaling the acceleration signal collected by the IEPE sensor, so that the output acceleration signal meets the collection input requirement, and noise interference is reduced; more stable and higher-quality acceleration data acquisition can be realized, and the whole conditioning circuit is simple in structure and low in hardware cost.

Description

Technical Field

[0001] The utility model relates to the technical field of acceleration acquisition, in particular to an IEPE sensor conditioning circuit and an acceleration acquisition device having the same. Background Art

[0002] IEPE (Integrated Electronics Piezo-Electric) sensor, that is, integrated circuit type piezoelectric sensor, has a built-in charge amplifier or voltage amplifier. IEPE sensor consists of a pressure point element (such as ceramic piezoelectric crystal or vinyl) and an integrated circuit. When acceleration acts on the piezoelectric element, the piezoelectric element will generate a charge proportional to the acceleration, which is then converted into a voltage signal output by the built-in amplifier, thereby realizing the acquisition of acceleration signals.

[0003] When the IEPE sensor is working, since the amount of electricity generated by the IEPE sensor is usually small and easily affected by noise interference, a constant current source is often configured. By configuring a constant current source, the sensor can obtain a stable and continuous current supply, improve signal quality, and reduce temporary interference. The performance of the constant current source will directly affect the data quality of the acceleration signal acquisition, so it is necessary to use a low-noise constant current source or perform signal conditioning based on the constant current source to obtain more stable and higher-quality acceleration data. However, the current IEPE sensor conditioning device rarely performs signal conditioning based on a constant current source, and the conditioning circuit structure is complex and the cost is high. Utility Model Content

[0004] In view of this, the utility model provides an IEPE sensor conditioning circuit and an acceleration acquisition device having the same, so as to solve the problem that the existing IEPE sensor conditioning devices rarely perform signal conditioning based on a constant current source, and the conditioning circuit structure is complex and the cost is high.

[0005] The utility model provides an IEPE sensor conditioning circuit, including a constant current source circuit, a sensor interface circuit and a signal scaling circuit;

[0006] The constant current source circuit is electrically connected to the input end of the signal scaling circuit through the sensor interface circuit, the sensor interface circuit is also electrically connected to the IEPE sensor, and the output end of the signal scaling circuit is electrically connected to an external signal receiving end.

[0007] Optionally, the constant current source circuit includes a driving chip U1, a first resistor R1, a second resistor R2, a second capacitor C2, a third capacitor C3, a fourth capacitor C4 and a fifth capacitor C5;

[0008] The power supply pin and PWM control pin of the driving chip U1 are both electrically connected to the 19.8V power supply end, and the ground pin of the driving chip U1 is grounded; the first end of the second capacitor C2, the first end of the third capacitor C3 and the first end of the fourth capacitor C4 are all connected to the common connection end between the power supply pin of the driving chip U1 and the 19.8V power supply end, and the second end of the second capacitor C2, the second end of the third capacitor C3 and the second end of the fourth capacitor C4 are all grounded; the first end of the first resistor R1 is connected to the common connection end between the power supply pin of the driving chip U1 and the 19.8V power supply end, and the second end of the first resistor R1 is electrically connected to the input pin of the driving chip U1; the first end of the second resistor R2 is connected to the common connection end between the second end of the first resistor R1 and the input pin of the driving chip U1, and the second end of the second resistor R2 is electrically connected to the output pin of the driving chip U1; the output pin of the driving chip U1 is also grounded through the fifth capacitor C5, and the output pin of the driving chip U1 is also electrically connected to the sensor interface circuit.

[0009] Optionally, the driver chip U1 is specifically a TPS92612 driver chip.

[0010] Optionally, the sensor interface circuit includes a third resistor R3, a fifth resistor R5 and a connector P1 with 2 pins;

[0011] Pin No. 1 and Pin No. 2 of the connector P1 are electrically connected to the IEPE sensor, Pin No. 2 of the connector P1 is grounded, Pin No. 1 of the connector P1 is also electrically connected to the output end of the constant current source circuit, and Pin No. 1 of the connector P1 is also electrically connected to the input end of the signal scaling circuit through the third resistor R3; the first end of the fifth resistor R5 is connected to the common connection end between Pin No. 1 of the connector P1 and the third resistor R3, and the second end of the fifth resistor R5 is grounded.

[0012] Optionally, the signal scaling circuit includes an operational amplifier U2A, a first capacitor C1, a fourth resistor R4, a sixth resistor R6, a seventh resistor R7 and an eighth resistor R8;

[0013] The positive power pin of the operational amplifier U2A is electrically connected to the 19.8V power supply end, the first end of the first capacitor C1 is connected to the common connection end between the positive power pin of the operational amplifier U2A and the 19.8V power supply end, and the second end of the first capacitor C1 is grounded; the negative power pin of the operational amplifier U2A is grounded; the positive input pin of the operational amplifier U2A is electrically connected to the third resistor R3, the inverting input pin of the operational amplifier U2A is grounded through the seventh resistor R7, and the inverting input pin of the operational amplifier U2A is also electrically connected to the output pin of the operational amplifier U2A through the eighth resistor R8; the output pin of the operational amplifier U2A is also electrically connected to the signal receiving end through the fourth resistor R4, the first end of the sixth resistor R6 is connected to the common connection end between the second end of the fourth resistor R4 and the signal receiving end, and the second end of the sixth resistor R6 is grounded.

[0014] Optionally, it also includes an AD signal acquisition circuit;

[0015] The signal scaling circuit is electrically connected to the signal receiving end through the AD signal acquisition circuit.

[0016] Optionally, a power supply circuit is also included;

[0017] The power supply circuit is electrically connected to both the constant current source circuit and the signal scaling circuit.

[0018] In addition, the utility model also provides an acceleration acquisition device, including an IEPE sensor, a signal receiving end and the aforementioned IEPE sensor conditioning circuit;

[0019] The IEPE sensor and the signal receiving end are both electrically connected to the IEPE sensor conditioning circuit.

[0020] Optionally, the signal receiving end includes any one of an MCU processor, a DSP processor and an FPGA processor.

[0021] The beneficial effects of the utility model are as follows: since the sensor interface circuit is electrically connected to the IEPE sensor, the constant current source circuit is electrically connected to the signal scaling circuit through the sensor interface circuit. On the one hand, the constant current source circuit can be used to power the IEPE sensor to provide a stable and continuous current supply; on the other hand, the signal scaling circuit can be used to scale the acceleration signal collected by the IEPE sensor, so that the output acceleration signal meets the collection input requirements and reduces noise interference; the output end of the signal scaling circuit is electrically connected to the signal receiving end, so that the signal obtained after scaling can be sent to the signal receiving end, which is convenient for the signal receiving end to process and analyze the acceleration signal and realize the collection of the acceleration signal;

[0022] The IEPE sensor conditioning circuit and the acceleration acquisition device having the same of the utility model perform signal conditioning based on a constant current source, and can realize more stable and higher quality acceleration data acquisition. The entire conditioning circuit has a simple structure and low hardware cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings, which are schematic and should not be construed as limiting the present invention in any way. In the accompanying drawings:

[0024] Figure 1 The structure diagram of an IEPE sensor conditioning circuit in the first embodiment of the utility model is shown;

[0025] Figure 2 The design diagram of the constant current source circuit, the sensor interface circuit and the signal scaling circuit in the first embodiment of the utility model is shown;

[0026] Figure 3 The structure diagram of an IEPE sensor conditioning circuit in the first embodiment of the utility model is shown;

[0027] Figure 4 The structure diagram of the acceleration acquisition device in the second embodiment of the present utility model is shown. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0029] Embodiment 1

[0030] like Figure 1 As shown, an IEPE sensor conditioning circuit includes a constant current source circuit, a sensor interface circuit and a signal scaling circuit;

[0031] The constant current source circuit is electrically connected to the input end of the signal scaling circuit through the sensor interface circuit, the sensor interface circuit is also electrically connected to the IEPE sensor, and the output end of the signal scaling circuit is electrically connected to an external signal receiving end.

[0032] Since the sensor interface circuit is electrically connected to the IEPE sensor, the constant current source circuit is electrically connected to the signal scaling circuit through the sensor interface circuit. On the one hand, the constant current source circuit can be used to power the IEPE sensor to provide a stable and continuous current supply; on the other hand, the signal scaling circuit can be used to scale the acceleration signal collected by the IEPE sensor so that the output acceleration signal meets the collection input requirements and reduces noise interference; the output end of the signal scaling circuit is electrically connected to the signal receiving end, so that the signal obtained after scaling can be sent to the signal receiving end, which is convenient for the signal receiving end to process and analyze the acceleration signal and realize the collection of the acceleration signal.

[0033] The IEPE sensor conditioning circuit of this embodiment performs signal conditioning based on a constant current source, which can achieve more stable and higher quality acceleration data acquisition. The entire conditioning circuit has a simple structure and low hardware cost.

[0034] It should be understood that the present invention only improves the hardware circuit structure of the IEPE sensor conditioning circuit to achieve more stable and higher quality acceleration data acquisition, simplify the structure of the entire conditioning circuit and reduce hardware costs, and does not involve computer level improvements. The computer programs involved are all conventional computer programs in the art.

[0035] Preferably, if Figure 2 As shown, the constant current source circuit includes a driving chip U1, a first resistor R1, a second resistor R2, a second capacitor C2, a third capacitor C3, a fourth capacitor C4 and a fifth capacitor C5;

[0036] The power supply pin and PWM control pin of the driving chip U1 are both electrically connected to the 19.8V power supply end, and the ground pin of the driving chip U1 is grounded; the first end of the second capacitor C2, the first end of the third capacitor C3 and the first end of the fourth capacitor C4 are all connected to the common connection end between the power supply pin of the driving chip U1 and the 19.8V power supply end, and the second end of the second capacitor C2, the second end of the third capacitor C3 and the second end of the fourth capacitor C4 are all grounded; the first end of the first resistor R1 is connected to the common connection end between the power supply pin of the driving chip U1 and the 19.8V power supply end, and the second end of the first resistor R1 is electrically connected to the input pin of the driving chip U1; the first end of the second resistor R2 is connected to the common connection end between the second end of the first resistor R1 and the input pin of the driving chip U1, and the second end of the second resistor R2 is electrically connected to the output pin of the driving chip U1; the output pin of the driving chip U1 is also grounded through the fifth capacitor C5, and the output pin of the driving chip U1 is also electrically connected to the sensor interface circuit.

[0037] The constant current source circuit of the above structure can provide a stable current output for the IEPE sensor with a simplified circuit design ( Figure 2 The constant current source circuit in the embodiment can specifically provide a constant current output of 5mA); wherein, connecting a plurality of filter capacitors (including a second capacitor C2, a third capacitor C3 and a fourth capacitor C4) in parallel between the power supply pin and the ground can effectively reduce power supply noise and ripple; connecting a filter capacitor (i.e., a fifth capacitor C5) in parallel with the output pin can further smooth the output current, thereby effectively ensuring that the IEPE sensor provides a stable and reliable current output.

[0038] In the above constant current source circuit, the driver chip U1 specifically adopts the TPS92612 driver chip, which is used to form a constant current source circuit, which has the advantages of high precision, adjustable current, wide input voltage range, brightness control, low voltage drop and low quiescent current, protection function, heat sharing, wide operating junction temperature range and a wide range of application scenarios.

[0039] Preferably, if Figure 2 As shown, the sensor interface circuit includes a third resistor R3, a fifth resistor R5 and a connector P1 with 2 pins;

[0040] Pin No. 1 and Pin No. 2 of the connector P1 are electrically connected to the IEPE sensor, Pin No. 2 of the connector P1 is grounded, Pin No. 1 of the connector P1 is also electrically connected to the output end of the constant current source circuit, and Pin No. 1 of the connector P1 is also electrically connected to the input end of the signal scaling circuit through the third resistor R3; the first end of the fifth resistor R5 is connected to the common connection end between Pin No. 1 of the connector P1 and the third resistor R3, and the second end of the fifth resistor R5 is grounded.

[0041] In the above-mentioned sensor interface circuit, the connector P1 is electrically connected to the IEPE sensor, and then the signal collected by the IEPE sensor is connected; pin 1 of the connector P1 is electrically connected to the output end of the constant current source circuit on the one hand, and is electrically connected to the input end of the signal scaling circuit through the third resistor on the other hand, that is, on the one hand, the constant current source power supply is used to supply current to the IEPE sensor, and on the other hand, the signal collected by the IEPE sensor is sent to the subsequent signal scaling circuit for scaling.

[0042] Preferably, if Figure 2 As shown, the signal scaling circuit includes an operational amplifier U2A, a first capacitor C1, a fourth resistor R4, a sixth resistor R6, a seventh resistor R7 and an eighth resistor R8;

[0043] The positive power pin of the operational amplifier U2A is electrically connected to the 19.8V power supply end, the first end of the first capacitor C1 is connected to the common connection end between the positive power pin of the operational amplifier U2A and the 19.8V power supply end, and the second end of the first capacitor C1 is grounded; the negative power pin of the operational amplifier U2A is grounded; the positive input pin of the operational amplifier U2A is electrically connected to the third resistor R3, the inverting input pin of the operational amplifier U2A is grounded through the seventh resistor R7, and the inverting input pin of the operational amplifier U2A is also electrically connected to the output pin of the operational amplifier U2A through the eighth resistor R8; the output pin of the operational amplifier U2A is also electrically connected to the signal receiving end through the fourth resistor R4, the first end of the sixth resistor R6 is connected to the common connection end between the second end of the fourth resistor R4 and the signal receiving end, and the second end of the sixth resistor R6 is grounded.

[0044] Through the signal scaling circuit of the above structure, different scaling ratios can be achieved by adjusting the parameters of the operational amplifier U2A, and noise interference can be suppressed while scaling. It has good noise suppression capability, flexibility and stability, and effectively ensures the output of stable and reliable signals that meet the requirements of the post-stage AD acquisition input.

[0045] In the present embodiment, the operational amplifier U2A in the signal scaling circuit specifically adopts the GS2262-SR model operational amplifier.

[0046] Specifically, Figure 3 As shown, it also includes an AD signal acquisition circuit;

[0047] The signal scaling circuit is electrically connected to the signal receiving end through the AD signal acquisition circuit.

[0048] Through the AD signal acquisition circuit, the analog-to-digital conversion of the signal output by the signal scaling circuit can be realized, which can improve the signal quality and facilitate the digital signal processing and analysis at the signal receiving end.

[0049] The AD signal acquisition circuit of this embodiment may adopt a conventionally designed AD conversion circuit, which will not be listed in detail here.

[0050] Preferably, if Figure 3 As shown, a power supply circuit is also included;

[0051] The power supply circuit is electrically connected to both the constant current source circuit and the signal scaling circuit.

[0052] Through the power supply circuit, it is convenient to provide the required working voltage for the normal operation of the constant current source circuit and the signal scaling circuit (for example Figure 2 The 19.8V supply voltage required by the constant current source circuit and the signal scaling circuit ensures the functionality of the entire conditioning circuit.

[0053] The power supply circuit of this embodiment can adopt a conventionally designed power supply circuit, and the details are not listed here.

[0054] The resistors and capacitors in the constant current source circuit, the sensor interface circuit, and the signal scaling circuit can be selected according to the actual situation. The specific specifications in this embodiment are detailed in Figure 2 As shown, no more listing is given here.

[0055] Embodiment 2

[0056] like Figure 4 As shown, an acceleration acquisition device includes an IEPE sensor, a signal receiving end and the IEPE sensor conditioning circuit of the first embodiment;

[0057] The IEPE sensor and the signal receiving end are both electrically connected to the IEPE sensor conditioning circuit.

[0058] The acceleration acquisition device can achieve more stable and higher quality acceleration data acquisition with a simpler design and lower cost, and has high application value.

[0059] In this embodiment, the signal receiving end includes any one of an MCU processor, a DSP processor and an FPGA processor.

[0060] The above-mentioned signal receiving ends can process (such as encoding) and analyze the signals output by the IEPE sensor conditioning circuit, so as to facilitate the analysis, monitoring and transmission of acceleration data in application scenarios.

[0061] The IEPE sensor conditioning circuit of this embodiment has the same structure as the IEPE sensor conditioning circuit of the first embodiment. Therefore, for details not provided in this embodiment, please refer to the first embodiment and the second embodiment. Figures 1 to 3 The detailed description will not be repeated here.

[0062] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. An IEPE sensor conditioning circuit, characterized in that: It includes a constant current source circuit, a sensor interface circuit and a signal scaling circuit; The constant current source circuit is electrically connected to the input end of the signal scaling circuit through the sensor interface circuit, the sensor interface circuit is also electrically connected to the IEPE sensor, and the output end of the signal scaling circuit is electrically connected to an external signal receiving end.

2. The IEPE sensor conditioning circuit according to claim 1, characterized in that: The constant current source circuit includes a driving chip U1, a first resistor R1, a second resistor R2, a second capacitor C2, a third capacitor C3, a fourth capacitor C4 and a fifth capacitor C5; The power supply pin and PWM control pin of the driving chip U1 are both electrically connected to the 19.8V power supply end, and the ground pin of the driving chip U1 is grounded; the first end of the second capacitor C2, the first end of the third capacitor C3 and the first end of the fourth capacitor C4 are all connected to the common connection end between the power supply pin of the driving chip U1 and the 19.8V power supply end, and the second end of the second capacitor C2, the second end of the third capacitor C3 and the second end of the fourth capacitor C4 are all grounded; the first end of the first resistor R1 is connected to the common connection end between the power supply pin of the driving chip U1 and the 19.8V power supply end, and the second end of the first resistor R1 is electrically connected to the input pin of the driving chip U1; the first end of the second resistor R2 is connected to the common connection end between the second end of the first resistor R1 and the input pin of the driving chip U1, and the second end of the second resistor R2 is electrically connected to the output pin of the driving chip U1; the output pin of the driving chip U1 is also grounded through the fifth capacitor C5, and the output pin of the driving chip U1 is also electrically connected to the sensor interface circuit.

3. The IEPE sensor conditioning circuit according to claim 2, characterized in that: The driver chip U1 is specifically a TPS92612 driver chip.

4. The IEPE sensor conditioning circuit according to claim 1, characterized in that: The sensor interface circuit includes a third resistor R3, a fifth resistor R5 and a connector P1 with 2 pins; Pin No. 1 and Pin No. 2 of the connector P1 are electrically connected to the IEPE sensor, Pin No. 2 of the connector P1 is grounded, Pin No. 1 of the connector P1 is also electrically connected to the output end of the constant current source circuit, and Pin No. 1 of the connector P1 is also electrically connected to the input end of the signal scaling circuit through the third resistor R3; the first end of the fifth resistor R5 is connected to the common connection end between Pin No. 1 of the connector P1 and the third resistor R3, and the second end of the fifth resistor R5 is grounded.

5. The IEPE sensor conditioning circuit according to claim 4, characterized in that: The signal scaling circuit includes an operational amplifier U2A, a first capacitor C1, a fourth resistor R4, a sixth resistor R6, a seventh resistor R7 and an eighth resistor R8; The positive power pin of the operational amplifier U2A is electrically connected to the 19.8V power supply end, the first end of the first capacitor C1 is connected to the common connection end between the positive power pin of the operational amplifier U2A and the 19.8V power supply end, and the second end of the first capacitor C1 is grounded; the negative power pin of the operational amplifier U2A is grounded; the positive input pin of the operational amplifier U2A is electrically connected to the third resistor R3, the inverting input pin of the operational amplifier U2A is grounded through the seventh resistor R7, and the inverting input pin of the operational amplifier U2A is also electrically connected to the output pin of the operational amplifier U2A through the eighth resistor R8; the output pin of the operational amplifier U2A is also electrically connected to the signal receiving end through the fourth resistor R4, the first end of the sixth resistor R6 is connected to the common connection end between the second end of the fourth resistor R4 and the signal receiving end, and the second end of the sixth resistor R6 is grounded.

6. The IEPE sensor conditioning circuit according to claim 1, characterized in that: It also includes an AD signal acquisition circuit; The signal scaling circuit is electrically connected to the signal receiving end through the AD signal acquisition circuit.

7. The IEPE sensor conditioning circuit according to any one of claims 1 to 6, characterized in that: Also includes a power supply circuit; The power supply circuit is electrically connected to both the constant current source circuit and the signal scaling circuit.

8. An acceleration acquisition device, characterized in that: It comprises an IEPE sensor, a signal receiving end and an IEPE sensor conditioning circuit as claimed in any one of claims 1 to 7; The IEPE sensor and the signal receiving end are both electrically connected to the IEPE sensor conditioning circuit.

9. The acceleration acquisition device according to claim 8, characterized in that: The signal receiving end includes any one of an MCU processor, a DSP processor and an FPGA processor.

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