CN107907269A - A kind of resistance bridge sensor diagnostics circuit - Google Patents
A kind of resistance bridge sensor diagnostics circuit Download PDFInfo
- Publication number
- CN107907269A CN107907269A CN201710895386.0A CN201710895386A CN107907269A CN 107907269 A CN107907269 A CN 107907269A CN 201710895386 A CN201710895386 A CN 201710895386A CN 107907269 A CN107907269 A CN 107907269A
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- China
- Prior art keywords
- sensor
- resistance
- resistance bridge
- rct
- bridge
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
Abstract
The invention discloses a kind of resistance bridge sensor diagnostics circuit, sensor is powered by chip internal LDO output voltages VS, Ruf, Rdf are the equivalent pressure sensitive resistance in piezoresistive electric bridge, Ruc, Rdc are the equivalent auxiliary resistance in resistance bridge, and described Ruf, Rdf and Ruc, Rdc form resistance bridge；The resistance bridge is connected to Rct, and Rct is pressure touch chip internal subsidiary resistance；And controlling switch is connected to after Rct；The diagnostic circuit is arranged on pressure touch chip internal, touch chip is diagnosed in real time to working sensor state, so as to ensure that chip can carry out effective monitoring to the working status of sensor, greatly improves the reliability of system operation.
Description
Technical field
The invention belongs to the diagnostic circuit of sensor technical field, more particularly to sensor, in pressure measuring service
Whether diagnostic sensor normally connects, and whether energy diagnostic sensor is normal.
Background technology
With the rise of the Internet of things era, smart home, wisdom health market is increasingly taken seriously, and consumer is to man-machine
Interactive interface experience requirements are higher and higher, and sensor is then part indispensable in human-computer interaction interface, its performance is to production
The user experience of product plays a crucial role.Pressure touch becomes because its is simple in structure, the advantages of advantage of lower cost and is permitted
More intellectual products realize the preferred manner of human-computer interaction, and the working status of pressure sensor directly determines production as a rule
Whether product can normally receive user instruction, so the diagnosis of working sensor state is particularly important.
Patent application 201410469434.6 discloses a kind of non-linear compensation circuit of resistance bridge type sensor, including
Resistance bridge type sensor, excitation voltage source, signal amplification circuit, in the negative of resistance bridge type sensor and electric bridge power supply
Between end, common-mode resistance is concatenated；Signal amplification circuit output terminal is mutually contacted by feedback resistance with common-mode resistance.The present invention's is excellent
Putting is：Resistance bridge type sensor is experienced the transformed signal of external information (voltage) by the present invention puts through signal amplification circuit
Greatly, and in appropriate proportions (change feedback resistance) with after common mode electric resistance partial pressure, it is achieved thereby that being incremented by output signal sensitivity
Resistance bridge output type sensor nonlinear compensation.In addition the signal amplification circuit A in circuit can use digital programmable
Amplifier, can impose digital modulation zero-bit and full scale, reduce since the precision that resistance band is replaced in debugging process is low, stablizes
Spend the influence of difference.The patent application is detected by resistance bridge type sensor and carries out nonlinear compensation, but circuit structure is answered
Miscellaneous, cost of implementation is high, and its main purpose is to be applied to nonlinear compensation, is not known for the status display of sensor.
The content of the invention
Based on this, therefore the present invention primary mesh be to provide a kind of resistance bridge sensor diagnostics circuit, the circuit energy
Enough allow pressure touch chip to carry out self diagnosis to the working status of pressure sensor effectively in real time, user is understood accurately
Ground understands the instantaneous operating conditions of sensor.
It is to provide a kind of resistance bridge sensor diagnostics circuit, which passes through in pressure another mesh of the present invention
Increase sensor detection circuit, enables touch chip to be diagnosed in real time to working sensor state inside touch chip, so that
Ensure that chip can carry out effective monitoring to the working status of sensor, greatly improve the reliability of system operation.
To achieve the above object, the technical scheme is that：
A kind of resistance bridge sensor diagnostics circuit, it is characterised in that sensor by chip internal LDO output voltages VS into
Row power supply, Ruf, Rdf are the equivalent pressure sensitive resistance in piezoresistive electric bridge, and Ruc, Rdc are equivalent auxiliary in resistance bridge
Resistance is helped, described Ruf, Rdf and Ruc, Rdc form resistance bridge；The resistance bridge is connected to Rct, and Rct is pressure touch chip
Internal subsidiary resistance；And controlling switch is connected to after Rct, the controlling switch measures controlling switch for sensor diagnostic；Institute
State diagnostic circuit and be arranged on pressure touch chip internal, touch chip is diagnosed in real time to working sensor state, from
And ensure that chip can carry out the working status of sensor effective monitoring, greatly improve the reliability of system operation.
Further, the Rct has two, is connected to the both sides of resistance bridge respectively, and two of which Rct is connected to two respectively
S2, S3 sensor diagnostic measure controlling switch.
The resistance bridge is further connected with switching switch S1, S2, S3 etc., and pressure touch chip is by opening S1, S2, S3 etc.
Pass switches over, and then measures calculating by output of the AFE(analog front end) to different switch combination situation lower sensors, according to
The ADC code values of AFE(analog front end) output judge whether sensor works normally.
The present invention enables touch chip in real time to sensing by increasing sensor detection circuit in pressure touch chip internal
Device working status is diagnosed, and pressure touch chip can be allowed to be carried out effectively in real time to the working status of pressure sensor
Self diagnosis, so as to ensure that chip can carry out effective monitoring to the working status of sensor, greatly improves the reliability of system operation.
Brief description of the drawings
Fig. 1 is the circuit diagram that the present invention is implemented.
Fig. 2 is that the present invention implements measurement equivalent circuit diagram in 2P ends in Fig. 1.
Fig. 3 is that the present invention implements measurement equivalent circuit diagram in 3P ends in Fig. 1.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Shown in Fig. 1, the pressure sensor diagnostic circuit proposed by the present invention realized for the present invention is as shown in Figure 1, sensing
Device is powered by chip internal LDO output voltages VS, and Ruf, Rdf are the equivalent pressure sensitive resistance in piezoresistive electric bridge；
Ruc, Rdc are the equivalent auxiliary resistance in resistance bridge；Rct is pressure touch chip internal subsidiary resistance；S2, S3 are biography
Sensor diagnostic measurement controlling switch.Pressure touch chip by being switched over to switches such as S1, S2, S3, then by simulation before
The output to different switch combination situation lower sensors is held to measure calculating, the ADC code values exported according to AFE(analog front end) judge
Whether sensor works normally.
The sensor diagnostics circuit course of work proposed by the present invention is as follows：
Step S01：Switch S1n, S3p, S0p in Fig. 1 is made to close, other five switch off, its equivalent circuit such as Fig. 2
It is shown.
The sensor output voltage that the measurement of AFE(analog front end) Measurement channel obtains at this time is vp0.It is easy to get by Fig. 2：
Step S02：Switch S1n, S2p, S0p in Fig. 1 is made to close, other five switch off, its equivalent circuit such as Fig. 3
It is shown.
The sensor output voltage that the measurement of AFE(analog front end) Measurement channel obtains at this time is vp1.It is easy to get by Fig. 3：
In upper two formula, VS, Vp0, Vp1, Rct are known quantity, and Ruf and Rdc can be solved by simultaneous formula (1) and formula (2)
Value.
Step S03：AFE(analog front end) input channel is exchanged, repeat step S01 and step S02, can similarly solve Ruc and Rdf
Value.
So far, four resistance in sensor bridge more can be measured accurately, pass through the electricity measured to AFE(analog front end)
Pressure is judged to can determine whether that what sensor respectively held opens open circuit conditions.Illustrated below by taking one group of measurement data as an example, if mould
Intend front-end A/D C precision as 12 (in tables, italics mark for abnormal code value).
Only provide above under limited kind of combined situation as a result, more situations can be judged by similar approach.As passed
Sensor is normally in the case of connection, and AFE(analog front end) exports code value near 2048 in the case of four kinds of different switch foldings, if
There is exception in sensor connection, then exception will be occurred by exporting code value.Such as：When sensor P ends are opened a way, S2P, S0P, S1N are closed
Close, remaining disconnects corresponding output code value under on off state and abnormal (code value 1111, hence it is evident that deviate 2048) occurs.Can by upper table
Know, can be by the way that the code value measured be contrasted with normal condition, then according to the suitable threshold value of testing setup repeatedly
Each end connection status of sensor is diagnosed.
Therefore, the present invention enables touch chip real-time by increasing sensor detection circuit in pressure touch chip internal
Working sensor state is diagnosed, can allow the work shape that pressure touch chip can effectively in real time to pressure sensor
State carries out self diagnosis, so as to ensure that chip can carry out effective monitoring to the working status of sensor, greatly improves system operation
Reliability.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should all be included in the protection scope of the present invention.
Claims (3)
1. a kind of resistance bridge sensor diagnostics circuit, it is characterised in that sensor is carried out by chip internal LDO output voltages VS
Power supply, Ruf, Rdf are the equivalent pressure sensitive resistance in piezoresistive electric bridge, and Ruc, Rdc are the equivalent auxiliary in resistance bridge
Resistance, described Ruf, Rdf and Ruc, Rdc form resistance bridge；The resistance bridge is connected to Rct, and Rct is in pressure touch chip
Portion's subsidiary resistance；And controlling switch is connected to after Rct, the controlling switch measures controlling switch for sensor diagnostic；It is described
Diagnostic circuit is arranged on pressure touch chip internal.
2. resistance bridge sensor diagnostics circuit as claimed in claim 1, it is characterised in that the Rct has two, respectively
The both sides of resistance bridge are connected to, two of which Rct is connected to two S2, S3 sensor diagnostic measurement controlling switches respectively.
3. resistance bridge sensor diagnostics circuit as claimed in claim 2, it is characterised in that the resistance bridge, which is further connected with, to be cut
Switch is changed, pressure touch chip is by switching over switching switch, then by AFE(analog front end) to different switch combination situations
The output of lower sensor measures calculating, judges whether sensor works normally according to the ADC code values that AFE(analog front end) exports.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710895386.0A CN107907269A (en) | 2017-09-28 | 2017-09-28 | A kind of resistance bridge sensor diagnostics circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710895386.0A CN107907269A (en) | 2017-09-28 | 2017-09-28 | A kind of resistance bridge sensor diagnostics circuit |
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| Publication Number | Publication Date |
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| CN107907269A true CN107907269A (en) | 2018-04-13 |
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|---|---|---|---|
| CN201710895386.0A Pending CN107907269A (en) | 2017-09-28 | 2017-09-28 | A kind of resistance bridge sensor diagnostics circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111051820A (en) * | 2019-08-05 | 2020-04-21 | 深圳市汇顶科技股份有限公司 | Detection circuit, chip and detection system of bridge sensor |
| CN112254875A (en) * | 2020-10-26 | 2021-01-22 | 南通大学 | Circuit and method for judging connection state of bridge sensor |
| CN113865757A (en) * | 2021-09-16 | 2021-12-31 | 歌尔微电子股份有限公司 | Detection circuit and detection method of piezoresistive pressure sensor and electronic equipment |
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| US20050072244A1 (en) * | 2003-10-02 | 2005-04-07 | Kurtz Anthony D. | Shunt calibration for electronic pressure switches |
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| US20050072244A1 (en) * | 2003-10-02 | 2005-04-07 | Kurtz Anthony D. | Shunt calibration for electronic pressure switches |
| JP2010085190A (en) * | 2008-09-30 | 2010-04-15 | Denso Corp | Sensor apparatus and self-diagnosis method of sensor apparatus |
| CN201622109U (en) * | 2010-02-03 | 2010-11-03 | 徐州派特控制技术有限公司 | Toll-by-weight system analog signal generator |
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| 杨双龙等: "应变式多维力传感器的故障诊断方法与实现", 《电子测量与仪器学报》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111051820A (en) * | 2019-08-05 | 2020-04-21 | 深圳市汇顶科技股份有限公司 | Detection circuit, chip and detection system of bridge sensor |
| WO2021022459A1 (en) * | 2019-08-05 | 2021-02-11 | 深圳市汇顶科技股份有限公司 | Detection circuit of bridge sensor, chip and detection system |
| CN111051820B (en) * | 2019-08-05 | 2022-03-15 | 深圳市汇顶科技股份有限公司 | Detection circuit, chip and detection system of bridge sensor |
| US11686598B2 (en) | 2019-08-05 | 2023-06-27 | Shenzhen GOODIX Technology Co., Ltd. | Detection circuit of bridge sensor, chip and detection system |
| CN112254875A (en) * | 2020-10-26 | 2021-01-22 | 南通大学 | Circuit and method for judging connection state of bridge sensor |
| CN112254875B (en) * | 2020-10-26 | 2022-03-08 | 南通大学 | Circuit and method for judging connection state of bridge sensor |
| CN113865757A (en) * | 2021-09-16 | 2021-12-31 | 歌尔微电子股份有限公司 | Detection circuit and detection method of piezoresistive pressure sensor and electronic equipment |
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Application publication date: 20180413 |
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