CN206469877U - The differential type dipmeter that a kind of a reference source is powered - Google Patents
The differential type dipmeter that a kind of a reference source is powered Download PDFInfo
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- CN206469877U CN206469877U CN201621431522.8U CN201621431522U CN206469877U CN 206469877 U CN206469877 U CN 206469877U CN 201621431522 U CN201621431522 U CN 201621431522U CN 206469877 U CN206469877 U CN 206469877U
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Abstract
The utility model discloses the differential type dipmeter that a kind of a reference source is powered, including MEMS obliquity sensors chip, A/D converter, voltage-reference, MCU, RS485 interface, digital power module, MEMS obliquity sensors chip connects A/D converter, A/D converter connects MCU, MCU connection RS485 interfaces and digital power module, MEMS obliquity sensors chip and A/D converter are all connected with voltage-reference；The quantity of the MEMS obliquity sensors chip is two panels, and two panels MEMS obliquity sensor chips are reversibly mounted on pcb board.The utility model is that MEMS obliquity sensors chip and A/D converter are powered simultaneously using voltage-reference, while being greatly reduced inclination data using the MEMS obliquity sensors chip composition difference output of two panels same specification model receives extraneous power-supply fluctuation and the influence of temperature.
Description
Technical field
The utility model is related to the differential type dipmeter that a kind of a reference source is powered, and belongs to field of civil engineering, applied to knot
Structure safety and Health monitors industry.
Background technology
Current dipmeter typically realizes inclination measurement using the obliquity sensor chip of MEMS principles, but MEMS inclination angles are passed
The output and the power supply of MEMS obliquity sensors of sensor have direct relation, if the power supply of MEMS obliquity sensors is because of the external world
Disturbance or temperature change produce fluctuation, will directly affect inclined measurement accuracy.
The power supply of current MEMS obliquity sensors is powered by linear voltage regulator, but for the survey of civil structure
Amount, high to data required precision, small voltage pulsation can all bring the error in measurement to influence, and conventional linear voltage regulator
Output accuracy, drift, line regulation can not all meet system requirements.Being powered simultaneously only with a reference source, it is outer to eliminate
Portion's common mode disturbances, easily produce influence by extraneous such as power frequency component common mode disturbances on the accuracy of inclination data.
Utility model content
The purpose of this utility model is to solve to influence DATA REASONING because of unstable caused by power supply or temperature fluctuation
The problem of precision, and eliminate external common-mode interference so that reach power-supply fluctuation, external common-mode interference, temperature change environment
In it is high-precision to dipmeter survey data require.
The utility model is realized by following technical proposals.The differential type dipmeter that a kind of a reference source is powered, including
MEMS obliquity sensors chip, A/D converter, voltage-reference, MCU, RS485 interface, digital power module, MEMS inclination angles are passed
Sensor chip connects A/D converter, A/D converter connection MCU, MCU connection RS485 interfaces and digital power module, and MEMS inclines
Angle transducer chip and A/D converter are all connected with voltage-reference.
Further preferably, the quantity of the MEMS obliquity sensors chip is two panels, two panels MEMS obliquity sensor chips
It is reversibly mounted on pcb board.
Output and its power supply of the utility model for MEMS obliquity sensor chips have direct relation, use
Low noise, high accuracy and the low excursion with temperature of the ADR43x series of ADI companies, High-current output type a reference source supply for sensor
Electricity, greatly reducing MEMS obliquity sensors chip because of unstable caused by power supply or temperature fluctuation influences DATA REASONING
Precision.Simultaneously using the MEMS obliquity sensor chips of two panels identical parameters, reversely install, by single MEMS obliquity sensors core
The Single-end output of piece is combined into the difference output of two MEMS obliquity sensor chips, so as to reach in power-supply fluctuation, outside altogether
Mould is disturbed, high-precision to inclination measurement data in the environment of temperature change to require purpose.
The utility model is using the high accuracy of reference voltage source, low drifting, ultralow line regulation, while inclining to MEMS
A/D converter of its output analog signal of angle transducer chip and measurement is powered, and is powered with the numerical portion of system
It is independent, the crosstalk of digital and analog signaling is eliminated, can be in benchmark while being powered to MEMS obliquity sensors chip and A/D converter
Measurement error can be further reduced under the low surging condition in source, because the output of MEMS obliquity sensor chips is proportional to power supply electricity
Pressure, when using identical reference voltage be MEMS obliquity sensors chip and measurement part (A/D converter) and meanwhile power supply when, because
The error that reference voltage is produced can be compensated automatically.
Simultaneously using two panels MEMS obliquity sensors chip by original single MEMS obliquity sensors chip Single-end output
The difference output of dual chip is combined into, the benefit of difference output is exactly that can resist the common mode disturbances of outside, and its principle is as follows：
V1：For the output voltage of first MEMS obliquity sensor chip；V2：For second MEMS obliquity sensor chip
Output voltage；ΔV：It is interference voltage value of the collective effect on two MEMS chips for extraneous common mode interference signal.When
When two panels MEMS obliquity sensors chip constitutes difference output, total output V=[(V1+ Δ V)-(V2+ Δ V)]/2=(V1+
V2)/2, it is possible to see, at that time with two panels MEMS obliquity sensor chips when, using differential pair output can directly suppress
Fall the interference of work mould, so as to improve the precision of measurement.
Technique effect of the present utility model：It is that MEMS obliquity sensors chip and A/D are changed simultaneously using voltage-reference
Device is powered, while being greatly reduced inclination angle using the MEMS obliquity sensors chip composition difference output of two panels same specification model
Data receive extraneous power-supply fluctuation and the influence of temperature.
Brief description of the drawings
Fig. 1 is the differential type dipmeter block diagram that a reference source is powered.
Fig. 2 is the onboard installation diagram of MEMS obliquity sensor chips.
Fig. 3 is voltage-reference to MEMS obliquity sensors and A/D converter power supply circuit schematic diagram.
Fig. 4 is MCU circuit diagrams.
Fig. 5 is digital power module diagram.
Fig. 6 is RS485 interface circuit schematic diagrames.
In figure：1 --- MEMS obliquity sensors chip, 2 --- A/D converter, 3 --- voltage-reference, 4 --- MCU,
5 --- RS485 interfaces, 6 --- digital power module, 7 --- pcb boards.
Embodiment
The utility model is further elucidated below in conjunction with the accompanying drawings.
As shown in figure 1, the differential type dipmeter that a kind of a reference source is powered, including MEMS obliquity sensors chip 1, A/D turn
Parallel operation 2, voltage-reference 3, MCU4, RS485 interface 5, digital power module 6, the connection of MEMS obliquity sensors chip 1 A/D turn
Parallel operation 2, the connection MCU4 of A/D converter 2, MCU4 connection RS485 interfaces 5 and digital power module 6, MEMS obliquity sensor chips
1 and A/D converter 2 be all connected with voltage-reference 3.
As shown in Fig. 2 using the MEMS obliquity sensors chip 1 of two panels identical parameters simultaneously, pcb board 7 is reversibly mounted on
Upper (reversely install and refer to that sensitive axes are opposite), two MEMS are combined into by the Single-end output of single MEMS obliquity sensors chip 1
The difference output of obliquity sensor chip 1, is disturbed so as to reach in power-supply fluctuation, external common-mode, right in the environment of temperature change
Inclination measurement data are high-precision to require purpose.
In implementation process, because the output current of general voltage-reference 3 is all smaller, admittedly need to choose a output electricity
Stream meets the voltage-reference 3 of MEMS obliquity sensors chip 1 and the current drain of A/D converter 2.Pass through type selecting, ADR435BRZ
Meet system drive requirement.When designing circuit, as shown in Figure 3, it is necessary to which the analog power input AVDD of A/D converter 2 is drawn
Pin is connected in the output of voltage-reference 3, while the power supply VDD of two MEMS obliquity sensors chips 1 also is connected to
In the output of voltage-reference 3.The input of voltage-reference 3 is powered by the linear voltage regulator of system power supply part, carries out the first order
Voltage stabilizing processing, the input stage of such a reference source can ensure certain stability.The output of linear voltage regulator passes through number again simultaneously
Word power module is powered to the RS485 drivers and MCU4 of numerical portion respectively, the analog power and numeral of such whole system
Power module isolation can just avoid interfering.A/D converter 2 can use the high resolution conversion inputted with fully differential
Device, two differential input ends of A/D converter 2 connect the single-ended analog output letter of two panels MEMS obliquity sensors chip 1 respectively
Number, MCU4 reads the differential voltage value that A/D converter 2 is transformed into by internal bus such as SPI, is disappeared after the value is removed into 2
Except the original inclination angle magnitude of voltage after common mode disturbances, passing through arcsine reduction of operation angulation angle value.
Claims (6)
1. the differential type dipmeter that a kind of a reference source is powered, including MEMS obliquity sensors chip, A/D converter, voltage reference
Source, MCU, RS485 interface, digital power module, it is characterized in that：MEMS obliquity sensors chip connects A/D converter, and A/D turns
Parallel operation connects MCU, MCU connection RS485 interfaces and digital power module, and MEMS obliquity sensors chip and A/D converter connect
Connect voltage-reference.
2. the differential type dipmeter that a reference source according to claim 1 is powered, it is characterized in that：The MEMS obliquity sensors
The quantity of chip is two panels, and two panels MEMS obliquity sensor chips are reversibly mounted on pcb board.
3. the differential type dipmeter that a reference source according to claim 2 is powered, it is characterized in that：The simulation electricity of A/D converter
Source input AVDD pins are connected in voltage-reference output, while the power supply VDD of two MEMS obliquity sensor chips
It also is connected in voltage-reference output.
4. the differential type dipmeter that a reference source according to claim 3 is powered, it is characterized in that：The input of voltage-reference by
The linear voltage regulator of system power supply part is powered, and carries out the voltage stabilizing processing of the first order；The output of linear voltage regulator passes through again simultaneously
Digital power module is powered to the RS485 drivers and MCU of numerical portion respectively.
5. the differential type dipmeter that a reference source according to claim 3 is powered, it is characterized in that：A/D converter, which is used, to be had
The high resolution converters of fully differential input.
6. the differential type dipmeter that a reference source according to claim 5 is powered, it is characterized in that：Two differences of A/D converter
Input is divided to connect the single-ended analog output signal of two panels MEMS obliquity sensor chips respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621431522.8U CN206469877U (en) | 2016-12-23 | 2016-12-23 | The differential type dipmeter that a kind of a reference source is powered |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621431522.8U CN206469877U (en) | 2016-12-23 | 2016-12-23 | The differential type dipmeter that a kind of a reference source is powered |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206469877U true CN206469877U (en) | 2017-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621431522.8U Active CN206469877U (en) | 2016-12-23 | 2016-12-23 | The differential type dipmeter that a kind of a reference source is powered |
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| CN (1) | CN206469877U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20200412325A1 (en) * | 2019-06-27 | 2020-12-31 | Aac Acoustic Technologies (Shenzhen) Co., Ltd. | Differential resonator and mems sensor |
-
2016
- 2016-12-23 CN CN201621431522.8U patent/CN206469877U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20200412325A1 (en) * | 2019-06-27 | 2020-12-31 | Aac Acoustic Technologies (Shenzhen) Co., Ltd. | Differential resonator and mems sensor |
| US11784624B2 (en) * | 2019-06-27 | 2023-10-10 | Aac Acoustic Technologies (Shenzhen) Co., Ltd. | Differential resonator and MEMS sensor |
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