CN212210958U - Accelerometer output signal conditioning circuit - Google Patents
Accelerometer output signal conditioning circuit Download PDFInfo
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- CN212210958U CN212210958U CN202020740259.0U CN202020740259U CN212210958U CN 212210958 U CN212210958 U CN 212210958U CN 202020740259 U CN202020740259 U CN 202020740259U CN 212210958 U CN212210958 U CN 212210958U
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- 230000003750 conditioning effect Effects 0.000 title claims abstract description 60
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 7
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
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- 238000012986 modification Methods 0.000 description 1
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- 238000011056 performance test Methods 0.000 description 1
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- 238000005476 soldering Methods 0.000 description 1
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Abstract
The utility model relates to an accelerometer output signal conditioning circuit, including the circuit board, be equipped with signal conditioning circuit, signal input module, signal output module, internal input module and external output module on the circuit board, signal input module and the one end of internal input module are connected, the other end of internal input module and the one end of signal conditioning circuit are connected, the other end of signal conditioning circuit and one end of external output module are connected, the other end of external output module and signal output module are connected; the signal conditioning circuit comprises a power supply filtering module, a square wave conditioning module and a current conversion module. The utility model removes the high-frequency noise of the surrounding environment equipment coupled with the accelerometer output square wave through the square wave conditioning module, thereby improving the testing precision; through the current conversion module, weak current is converted into voltage output which can be tested conventionally, the testing precision of the multimeter with low digit can be met, and therefore the cost of testing equipment is reduced.
Description
Technical Field
The utility model relates to an accelerometer output signal technical field specifically is an accelerometer output signal conditioning circuit.
Background
An accelerometer output signal comprises a power supply, a ground, two standard square waves and one current, wherein the two standard square waves are accelerometer sensitive signals and are symmetrically output. The current output is a temperature signal of the accelerometer, and the power supply and the ground are power supply modules of the accelerometer.
When the accelerometer normally works or is produced, an output signal of the accelerometer needs to be externally connected, when the accelerometer works in a long distance or in a strong interference environment, data jitter can occur in the output of the accelerometer, for example, when high and low temperature cycle performance test is performed or the accelerometer to be tested is installed in certain equipment, the output signal of the accelerometer of a product to be tested can generate signal interference when reaching the testing equipment, interference signals are coupled into the accelerometer, abnormal jumping points can be generated by the signals, and the normal work of the accelerometer is influenced. In addition, when the accelerometer is actually used, due to the limitation of the installation position of the accelerometer, the output data of the accelerometer can be read only at a longer distance, and at the moment, the output of the accelerometer is easy to fluctuate, so that the work is abnormal.
The temperature current output of the accelerometer is weak in order to reduce power consumption, the current is weak generally, the precision resolution ratio needs to reach nanoampere, at the moment, the current test gear of a general 6-bit half-multimeter is only 10mA at the minimum, 1 nanoampere cannot be distinguished during direct test, and the temperature is the test basis of the accelerometer, so that the performance is reduced. In addition, a digital multimeter of higher accuracy can be used for the temperature current test, but the cost of the test equipment is increased.
In conclusion, an accelerometer output signal can not be directly provided to test equipment for use, signal conditioning needs to be performed at an accelerometer base output position, and the problems that square wave interference and low current precision may occur in signals are avoided.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an accelerometer output signal conditioning circuit to solve the problem among the prior art.
In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides an accelerometer output signal conditioning circuit, includes the circuit board, be equipped with signal conditioning circuit, signal input module, signal output module on the circuit board, to input module and outer output module, signal input module and the one end of inputting module are connected, the other end and the one end of signal conditioning circuit of inputting module are connected, signal conditioning circuit's the other end with connect output module one end outward, outer other end and the signal output module of connecting output module.
The signal conditioning circuit comprises a power supply filtering module, a square wave conditioning module and a current conversion module, wherein the power supply filtering module, the square wave conditioning module and the current conversion module are connected in parallel;
the power supply filtering module, the square wave conditioning module and the current conversion module are all composed of high-precision resistors and capacitors;
the signal conditioning circuit adopts a conventional FR4 material as a base material, and the lead adopts a copper-based lead layer and a surface gold immersion or gold plating process.
Preferably, the signal conditioning circuit adopts an upper layer of wiring and a lower layer of wiring, adopts a standard 6Pin connector externally, and adopts a point contact mode internally.
Preferably, the power supply filtering module is arranged at the position closest to the internal input contact, and two-stage filtering is adopted.
Preferably, the square wave conditioning module performs filtering processing by using a low-pass filter.
Preferably, the square wave conditioning module is formed by connecting an R1 resistor and a C1 capacitor in series.
Preferably, the current conversion module is formed by connecting an R2 resistor and a C2 capacitor in parallel.
The utility model discloses possess following beneficial effect at least:
1. the utility model removes the high-frequency noise of the surrounding environment equipment coupled with the accelerometer output square wave through the square wave conditioning module, thereby improving the testing precision;
2. the utility model converts weak current into voltage output which can be tested conventionally through the current conversion module, and can meet the testing precision of the universal meter with low digit, thereby reducing the cost of testing equipment;
3. the utility model discloses, adopt heavy gold or gilding technology to internal input, design the pad on signal conditioning circuit, after accelerometer stitch terminal surface or spring pin terminal surface contact, produce certain pretightning force, this kind of connected mode has avoided traditional accelerometer to be connected with the circuit board and has needed soldering transition connector mode, and the connector can take place small displacement at the vibration in-process, reduces the signal stability, the utility model discloses the scheme can improve the reliability of connecting.
Drawings
FIG. 1 is a block diagram schematically illustrating the structure of the present invention;
fig. 2 is a block diagram schematically illustrating the structure of the signal conditioning circuit according to the present invention;
fig. 3 is a schematic structural diagram of the square wave conditioning module of the present invention;
fig. 4 is a schematic structural diagram of the medium current conversion module of the present invention.
In the reference symbols: 10. a circuit board; 11. a signal input module; 12. an intra-pair input module; 13. a signal conditioning circuit; 131. a power supply filtering module; 132. a square wave conditioning module; 1321. r1 resistance; 1322. a C1 capacitance; 133. a current conversion module; 1331. r2 resistance; 1332. a C2 capacitance; 14. an external unified output module; 15. and a signal output module.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Examples
Referring to fig. 1-4, the present invention provides a technical solution: an accelerometer output signal conditioning circuit comprises a circuit board 10, wherein a signal conditioning circuit 13, a signal input module 11, a signal output module 15, an internal input module 12 and an external output module are arranged on the circuit board 10, the signal input module 11 is connected with one end of the internal input module 12, the other end of the internal input module 12 is connected with one end of the signal conditioning circuit 13, the other end of the signal conditioning circuit 13 is connected with one end of an external unified output module 14, and the other end of the external unified output module 14 is connected with the signal output module 15; the signal conditioning circuit 13 comprises a power supply filtering module 131, a square wave conditioning module 132 and a current conversion module 133, wherein the power supply filtering module 131, the square wave conditioning module 132 and the current conversion module 133 are connected in parallel; the power supply filtering module 131, the square wave conditioning module 132 and the current conversion module 133 are all composed of high-precision resistors and capacitors; the signal conditioning circuit 13 adopts a conventional FR4 material as a base material, a copper-based lead layer is adopted as a lead, and a gold immersion or gold plating process is carried out on the surface of the lead;
the signal conditioning circuit 13 adopts upper and lower layers of wiring, adopts a standard 6Pin connector externally, and adopts a point contact mode internally. The signal flow sequence is that the signal enters through the internal input contact point, the internal input contact point is a surface pad, the pad is in contact with the end face of a pin of the accelerometer or the end face of a transition spring pin, the signal is stably led into the signal conditioning circuit through the pretightening force, the signal is dispersed after entering the signal conditioning circuit 13, a power ground is laid on the upper layer and the lower layer of the circuit in a through mode, a plurality of contact points are generated through a plurality of through holes to form preliminary signal isolation, a filter capacitor is placed at the nearest position of the internal input contact point through power supply, and the 4.7uF and 10nF capacitors adopt two-stage filtering to ensure that high-frequency noise of.
Square wave conditioning module 132, during accelerometer square wave signal output, because the electromagnetic interference of equipment on every side, high frequency noise is advanced in the square wave internal coupling, the utility model discloses a low pass filter carries out filtering, through the test, between accelerometer square wave output frequency range 30KHz to 40KHz, high frequency noise is more than 10MHz, this adopts 56 omega resistance, 15pF electric capacity series connection, as the mode of fig. 3, low frequency square wave signal flows through the order, pass through resistance R1 behind the square wave input, then direct output square wave signal, because electric capacity is the off-state for the frequency below the off-frequency point, after high frequency signal process resistance R1, because electric capacity does not end high frequency signal, high frequency signal keeps apart through C1 inflow stratum, thereby square wave output's accuracy has been guaranteed. Regarding the selection principle of cut-off frequency, the cut-off frequency point is ensured to be larger than 10 times and the effective frequency, in addition, the resistor R1 cannot be selected to be too large, the signal passing through the resistor R1 can be attenuated, especially when the amplitude of the detected signal needs to be considered.
The current conversion module 133, the temperature signal output of the accelerometer adopts current output, because the current is small, the direct test has high requirements for the test digit and precision of the device, therefore, the current is generally adopted to generate voltage signal after passing through the resistor, the test device tests the voltage, in the actual use process, the noise of the test data is found to be large, therefore, the improvement scheme is shown in figure 4, when selecting the high-precision low-temperature drift resistor, a capacitor is connected in parallel at two ends of the high-precision low-temperature drift resistor, the capacitance value of the capacitor is related to the test frequency of the resistor and the data, the time constant is calculated according to the principle, the resistance value of the resistor is determined according to the range of the test device, the voltage value corresponding to the temperature output of the accelerometer in the full temperature range is in a certain range of the test device, and the range is fully utilized, the resistor follows the test environment, therefore, the temperature drift of the resistor, the temperature coefficient of resistance is a concern and is typically selected to be less than or equal to 25 ppm/deg.C, where the resistance induced error is much less than the temperature noise error of the accelerometer itself.
The basic principles and the main features of the invention and the advantages of the invention have been shown and described above, it will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, but that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention 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.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The accelerometer output signal conditioning circuit is characterized by comprising a circuit board (10), wherein the circuit board (10) is provided with a signal conditioning circuit (13), a signal input module (11), a signal output module (15), an internal input module (12) and an external output module, the signal input module (11) is connected with one end of the internal input module (12), the other end of the internal input module (12) is connected with one end of the signal conditioning circuit (13), the other end of the signal conditioning circuit (13) is connected with one end of an external unified output module (14), and the other end of the external unified output module (14) is connected with the signal output module (15);
the signal conditioning circuit (13) comprises a power supply filtering module (131), a square wave conditioning module (132) and a current conversion module (133), wherein the power supply filtering module (131), the square wave conditioning module (132) and the current conversion module (133) are connected in parallel; the power supply filtering module (131), the square wave conditioning module (132) and the current conversion module (133) are all composed of high-precision resistors and capacitors;
the signal conditioning circuit (13) adopts a conventional FR4 material as a base material, and the lead adopts a copper-based lead layer and a surface gold immersion or gold plating process.
2. The accelerometer output signal conditioning circuit of claim 1, wherein: the signal conditioning circuit (13) adopts an upper layer of wiring and a lower layer of wiring, adopts a standard 6Pin connector externally, and adopts a point contact mode internally.
3. The accelerometer output signal conditioning circuit of claim 1, wherein: the power supply filtering module (131) is arranged at the nearest position of the internal input contact and adopts two-stage filtering.
4. The accelerometer output signal conditioning circuit of claim 1, wherein: the square wave conditioning module (132) adopts a low-pass filter for filtering.
5. The accelerometer output signal conditioning circuit of claim 4, wherein: the square wave conditioning module (132) is formed by connecting an R1 resistor (1321) and a C1 capacitor (1322) in series.
6. The accelerometer output signal conditioning circuit of claim 1, wherein: the current conversion module (133) is formed by connecting an R2 resistor (1331) and a C2 capacitor (1332) in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020740259.0U CN212210958U (en) | 2020-04-30 | 2020-04-30 | Accelerometer output signal conditioning circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020740259.0U CN212210958U (en) | 2020-04-30 | 2020-04-30 | Accelerometer output signal conditioning circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212210958U true CN212210958U (en) | 2020-12-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020740259.0U Active CN212210958U (en) | 2020-04-30 | 2020-04-30 | Accelerometer output signal conditioning circuit |
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| Country | Link |
|---|---|
| CN (1) | CN212210958U (en) |
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2020
- 2020-04-30 CN CN202020740259.0U patent/CN212210958U/en active Active
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Effective date of registration: 20240621 Address after: Room 101 and 102, 1st Floor, Building 6, No. 500 Huibang Road, Qingpu District, Shanghai, 201799 Patentee after: Shanghai Jirui Xinghan Sensing Technology Co.,Ltd. Country or region after: China Address before: Room 208, area D, 2 / F, building 1, No.480 Huapu Road, Qingpu District, Shanghai 201700 Patentee before: SHANGHAI ZHAOQING SENSOR TECHNOLOGY Co.,Ltd. Country or region before: China |