CN110220537A - A kind of detection circuit applied to piezoresistive transducer - Google Patents
A kind of detection circuit applied to piezoresistive transducer Download PDFInfo
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- CN110220537A CN110220537A CN201910505351.0A CN201910505351A CN110220537A CN 110220537 A CN110220537 A CN 110220537A CN 201910505351 A CN201910505351 A CN 201910505351A CN 110220537 A CN110220537 A CN 110220537A
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- 238000001514 detection method Methods 0.000 title claims abstract description 20
- 238000012360 testing method Methods 0.000 claims abstract description 16
- 239000003990 capacitor Substances 0.000 claims description 53
- 230000005611 electricity Effects 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims 1
- 230000000087 stabilizing effect Effects 0.000 claims 1
- 230000009466 transformation Effects 0.000 claims 1
- 238000012545 processing Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 241000272470 Circus Species 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000008447 perception Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000004209 hair Anatomy 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/16—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying resistance
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The invention discloses a kind of detection circuits applied to piezoresistive transducer, including sequentially connected direct current regulation circuit, bleeder circuit, differential amplifier circuit and zeroing circuit, the bleeder circuit includes the first branch and second branch being mutually in parallel, the first branch is connected in series by the first reference resistance and series side, the second branch is connected in series by the second reference resistance and third reference resistance, between first reference resistance and series side, and between second reference resistance and third reference resistance, lead line accesses the differential amplifier circuit respectively, the potential difference under zero input is eliminated using zeroing circuit, in combination with direct current regulation circuit to the detection smooth processing of electric current further progress, so that more stable to the testing result of piezoresistive transducer and accurate, the equipment cost of circuit is also reduced simultaneously, stablize Property is higher.
Description
Technical field
The present invention relates to a kind of detection circuit of facing sensing device, especially a kind of detection applied to piezoresistive transducer
Circuit.
Background technique
Piezoresistive transducer is by experiencing the variation of external physical quantity so as to cause some performance hairs of sensor itself
Variation has been given birth to, and these variations will be exported in a manner of electric signal by conversion elements.Currently, traditional test means are to pass through favour
The potential difference at stone bridge test piezoresistive transducer both ends reflects extraneous test environmental change, and this test method can band
Carry out biggish experimental error, most of detected electric signals all show many unstable factors, and there are many interference
Extremely strong common-mode signal brings very big error to experimental result.
Summary of the invention
To solve the above problems, the present invention provides a kind of detection circuit applied to piezoresistive transducer, it is different from tradition
Wheatstone bridge test mode, be based on direct current regulation circuit and zeroing circuit, more stable and accurate measurement knot can be brought
Fruit, while also reducing circuit arrangement cost.
Technical solution used by the present invention solves the problems, such as it is:
A kind of detection circuit applied to piezoresistive transducer, including direct current regulation circuit, bleeder circuit, differential amplification electricity
Road and zeroing circuit, the bleeder circuit include the first branch and second branch, the first branch and second branch it is in parallel after
Ground connection, the first branch include the first reference resistance and the series side for accessing sensor to be measured, and described first with reference to electricity
Resistance and series side series connection, the second branch include the second reference resistance and third reference resistance, second reference resistance and
The series connection of third reference resistance, the output end of the direct current regulation circuit connect the bleeder circuit, first reference resistance with
Between series side and between second reference resistance and third reference resistance, lead line accesses the difference and puts respectively
The output end of big circuit, the zeroing circuit connects the differential amplifier circuit, the output end conduct of the differential amplifier circuit
Testing result output end.
Further, the direct current regulation circuit includes transformer, rectification circuit, filter circuit and voltage regulator circuit, the change
Depressor, rectification circuit, filter circuit and voltage regulator circuit are sequentially connected, and the voltage regulator circuit connects the bleeder circuit, the change
The input terminal of depressor connects electric main, and the output end of the transformer connects two exchange ends of the rectification circuit.Pass through
Electric main is transformed into direct current and carries out smooth shaping by the direct current regulation circuit, keeps circuit more steady in the detection process
It is fixed.
Further, the model NLT-PQ-4-10 of the transformer, the model 1B4B42 of the rectification circuit.NLT-
PQ-4-10 is Mutual Inductance Coupling transformer, and 1B4B42 is single phase bridge type rectifier circu.
Further, the filter circuit includes the second capacitor and third capacitor, and second capacitor and third capacitor are in parallel
Two DC terminals of the rectification circuit are accessed afterwards.The fluctuation in direct current is filtered using the characteristic of capacitor, is obtained
Purer direct current.
Further, the voltage regulator circuit includes voltage-stablizer, first resistor, second resistance, 3rd resistor, first capacitor and electricity
Hold, the input terminal of the voltage-stablizer is connect with the filter circuit, the end common, first resistor and the third electricity of the voltage-stablizer
Resistance is sequentially connected in series, and the output end of the second resistance and the capacitor series connection access voltage-stablizer, the first capacitor also accesses institute
State the output end of voltage-stablizer.Voltage-stablizer to voltage carry out shaping, keep testing result more acurrate, obtained waveform diagram more close to
The changing rule of piezoresistive transducer.
Further, the first resistor is 1K Ω, and the second resistance is 60 Ω, and the 3rd resistor is 20 Ω, described
First capacitor is 1uF, and second capacitor is 470uf, and the third capacitor is 100uf, and the capacitor is 100nF.
Further, the first resistor is 5K Ω, and the second resistance is 47 Ω, and the 3rd resistor is 60 Ω, described
First capacitor is 47uF, and second capacitor is 47uf, and the third capacitor is 200uf, and the capacitor is 47nF.
The embodiment of the present invention at least has the following beneficial effects: that the present invention eliminates the electricity under zero input using zeroing circuit
Potential difference, in combination with direct current regulation circuit to the detection smooth processing of electric current further progress, so that the inspection to piezoresistive transducer
It is more stable and accurate to survey result, access detecting instrument is not needed in another aspect circuit, is excluded certainly from supply source voltage source
The interference of body circuit, while the equipment cost of circuit is also reduced, stability is higher.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is the circuit module connection figure of the embodiment of the present invention；
Fig. 2 is the circuit diagram of the direct current regulation circuit of the embodiment of the present invention；
Fig. 3 is that perception extraneous test environmental change output resistance variation in sensor both ends is directly tested under conventional method
Waveform diagram；
Fig. 4 is that the embodiment of the present invention is detected exported waveform diagram to piezoresistive transducer.
Specific embodiment
This part will be described in specific embodiments of the present invention, and the preferred embodiments of the invention is shown in the accompanying drawings, attached
The effect of figure be with figure remark additionally book word segment description, enable a person to intuitively, visually understand of the invention
Each technical characteristic and overall technical architecture, but it should not be understood as limiting the scope of the invention.
In the description of the present invention, it is to be understood that, be related to orientation description, for example, above and below, front, rear, left and right etc.
The orientation or positional relationship of instruction is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of the description present invention and letter
Change description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific orientation construct and
Operation, therefore be not considered as limiting the invention.
In the description of the present invention, several to be meant that one or more, it is multiple to be meant that two or more, be greater than,
Be less than, more than etc. be interpreted as not including this number, it is above, following, within etc. be interpreted as including this number.If there is being described to first,
Second is only intended to for the purpose of distinguishing technical characteristic, is not understood to indicate or imply relative importance or implicitly indicates institute
The quantity of the technical characteristic of instruction or the precedence relationship for implicitly indicating indicated technical characteristic.
In description of the invention, unless otherwise restricted clearly, the words such as setting, installation, connection be shall be understood in a broad sense, institute
Above-mentioned word in the present invention specific can rationally be determined with the particular content of combination technology scheme by belonging to technical field technical staff
Meaning.
Referring to Fig.1, the first embodiment of the present invention provides a kind of detection circuit applied to piezoresistive transducer, including
Direct current regulation circuit, bleeder circuit, differential amplifier circuit and zeroing circuit, the bleeder circuit include the first branch and second
Road is grounded after the first branch and second branch are in parallel, the first branch include the first reference resistance and for access to
Survey sensor series side, first reference resistance and series side series connection, the second branch include the second reference resistance and
Third reference resistance, second reference resistance and the series connection of third reference resistance, the output end connection of the direct current regulation circuit
The bleeder circuit, between first reference resistance and series side and second reference resistance and third reference resistance
Between, lead line accesses the differential amplifier circuit respectively, and the output end of the zeroing circuit connects the differential amplification electricity
Road, the output end of the differential amplifier circuit is as testing result output end.When measuring piezoresistive transducer, by biography to be measured
Sensor accesses the series side, and sensor to be measured is made to connect with the first reference resistance, then carries out pressure behaviour to sensor to be measured
Make, such as pressing is primary at regular intervals, can obtain in the output end of differential amplifier circuit and cell pressure to be measured is followed to become
The testing result of change.In general, the output of differential amplifier circuit terminates oscillograph, facilitates observation waveform and obtains testing number
According to.
Referring to Fig. 2, the direct current regulation circuit includes transformer T1, rectification circuit, filter circuit and voltage regulator circuit, described
Transformer T1, rectification circuit, filter circuit and voltage regulator circuit are sequentially connected, and the voltage regulator circuit connects the bleeder circuit, institute
The input terminal connection electric main of transformer T1 is stated, the output end of the transformer T1 connects two exchanges of the rectification circuit
End.The filter circuit includes that the second capacitor C2 and third capacitor C3, the second capacitor C2 and third capacitor C3 parallel connection are followed by
Enter two DC terminals of the rectification circuit.
The voltage regulator circuit includes voltage-stablizer U1, first resistor R1, second resistance R2,3rd resistor R3, first capacitor C1
It is connect with the input terminal of capacitor C4, the voltage-stablizer U1 with the filter circuit, the end common of the voltage-stablizer U1, the first electricity
Resistance R1 and 3rd resistor R3 is sequentially connected in series, the output end of the second resistance R2 and the capacitor C4 series connection access voltage-stablizer U1,
The first capacitor C1 also accesses the output end of the voltage-stablizer U1.
In the present embodiment, the model NLT-PQ-4-10 of the transformer T1, the model of the rectification circuit
1B4B42.Actually NLT-PQ-4-10 is that Mutual Inductance Coupling transformer T1,1B4B42 are single phase bridge type rectifier circu, described first
Resistance R1 is 1K Ω, and the second resistance R2 is 60 Ω, and the 3rd resistor R3 is 20 Ω, and the first capacitor C1 is 1uF, institute
Stating the second capacitor C2 is 470uf, and the third capacitor C3 is 100uf, and the capacitor C4 is 100nF, referring to Fig. 3 and Fig. 4, Fig. 3
For do not access the embodiment of the present invention piezoresistive transducer output waveform, actually directly the perception of test sensor both ends is outer
Boundary tests the registration of environmental change output resistance, i.e., traditional method is that sensing to be measured can be indicated using resistance change
The working condition of device, and Fig. 4 is the output waveform for accessing the piezoresistive transducer of the embodiment of the present invention, due to the embodiment of the present invention
Output connect oscillograph, therefore obtained voltage-vs-time relationship waveform diagram, may also indicate that out the variation of resistance value, compared
Fig. 3 and Fig. 4 can clearly be seen that the testing result after circuit of the present invention is more smooth than traditional method, and waveform is more
It is smooth, and all kinds of interference in actual conditions are filtered, obtained waveform diagram is more true and reliable.
The second embodiment of the present invention provides a kind of detection circuit applied to piezoresistive transducer, with first embodiment
Between difference be, the first resistor R1 be 5K Ω, the second resistance R2 be 47 Ω, the 3rd resistor R3 be 60
Ω, the first capacitor C1 are 47uF, and the second capacitor C2 is 47uf, and the third capacitor C3 is 200uf, the capacitor C4
For 47nF.As another embodiment, adjustment has been made in parameter, has been shown for different piezoresistive transducers, as long as adjustment
Preferable measurement result can be realized in suitable parameter.
In fact, resistance and capacitor value of the invention have certain range, the parameter area of the first resistor R1
For 1K Ω -10K Ω, the parameter area that the parameter area of the second resistance R2 is 1 Ω -100 Ω, the 3rd resistor R3 is 1
The parameter area of Ω -120 Ω, the first capacitor C1 are 1uF-100uF, and the parameter area of the second capacitor C2 is 1uF-
The parameter area of 500uF, the third capacitor C3 are 1uF-300uF, and the parameter area of the capacitor C4 is 1uF-400uF.
Two embodiments of the invention utilize zeroing circuit to eliminate the potential difference under zero input, in combination with DC voltage-stabilizing
Circuit is to the detection smooth processing of electric current further progress, so that more stable to the testing result of piezoresistive transducer and accurate,
Access detecting instrument is not needed in another aspect circuit, the interference of itself circuit is excluded from supply source voltage source, while reducing yet
The equipment cost of circuit, stability are higher.
More than, only presently preferred embodiments of the present invention, the invention is not limited to above embodiment, as long as its with
Identical means reach technical effect of the invention, all should belong to protection scope of the present invention.
Claims (7)
1. a kind of detection circuit applied to piezoresistive transducer, it is characterised in that: including direct current regulation circuit, bleeder circuit,
Differential amplifier circuit and zeroing circuit, the bleeder circuit include the first branch and second branch, the first branch and second
It is grounded after branch circuit parallel connection, the first branch includes the first reference resistance and the series side for accessing sensor to be measured, described
First reference resistance and series side series connection, the second branch include the second reference resistance and third reference resistance, described second
Reference resistance and the series connection of third reference resistance, the output end connection bleeder circuit of the direct current regulation circuit, described first
Between reference resistance and series side and between second reference resistance and third reference resistance, lead line access respectively
The output end of the differential amplifier circuit, the zeroing circuit connects the differential amplifier circuit, the differential amplifier circuit
Output end is as testing result output end.
2. a kind of detection circuit applied to piezoresistive transducer according to claim 1, it is characterised in that: the direct current
Voltage regulator circuit includes transformer (T1), rectification circuit, filter circuit and voltage regulator circuit, the transformer (T1), rectification circuit, filter
Wave circuit and voltage regulator circuit are sequentially connected, and the voltage regulator circuit connects the bleeder circuit, the input terminal of the transformer (T1)
Electric main is connected, the output end of the transformer (T1) connects two exchange ends of the rectification circuit.
3. a kind of detection circuit applied to piezoresistive transducer according to claim 2, it is characterised in that: the transformation
The model NLT-PQ-4-10 of device (T1), the model 1B4B42 of the rectification circuit.
4. a kind of detection circuit applied to piezoresistive transducer according to claim 2, it is characterised in that: the filtering
Circuit includes the second capacitor (C2) and third capacitor (C3), accesses institute after second capacitor (C2) and third capacitor (C3) parallel connection
State two DC terminals of rectification circuit.
5. a kind of detection circuit applied to piezoresistive transducer according to claim 4, it is characterised in that: the pressure stabilizing
Circuit includes voltage-stablizer (U1), first resistor (R1), second resistance (R2), 3rd resistor (R3), first capacitor (C1) and capacitor
(C4), the input terminal of the voltage-stablizer (U1) is connect with the filter circuit, the end common of the voltage-stablizer (U1), the first electricity
Resistance (R1) and 3rd resistor (R3) are sequentially connected in series, and the second resistance (R2) and capacitor (C4) series connection access the voltage-stablizer (U1)
Output end, the first capacitor (C1) also accesses the output end of the voltage-stablizer (U1).
6. a kind of detection circuit applied to piezoresistive transducer according to claim 5, it is characterised in that: described first
Resistance (R1) is 1K Ω, and the second resistance (R2) is 60 Ω, and the 3rd resistor (R3) is 20 Ω, the first capacitor (C1)
For 1uF, second capacitor (C2) is 470uf, and the third capacitor (C3) is 100uf, and the capacitor (C4) is 100nF.
7. a kind of detection circuit applied to piezoresistive transducer according to claim 5, it is characterised in that: described first
Resistance (R1) is 5K Ω, and the second resistance (R2) is 47 Ω, and the 3rd resistor (R3) is 60 Ω, the first capacitor (C1)
For 47uF, second capacitor (C2) is 47uf, and the third capacitor (C3) is 200uf, and the capacitor (C4) is 47nF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910505351.0A CN110220537A (en) | 2019-06-12 | 2019-06-12 | A kind of detection circuit applied to piezoresistive transducer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910505351.0A CN110220537A (en) | 2019-06-12 | 2019-06-12 | A kind of detection circuit applied to piezoresistive transducer |
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| CN110220537A true CN110220537A (en) | 2019-09-10 |
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| CN201910505351.0A Pending CN110220537A (en) | 2019-06-12 | 2019-06-12 | A kind of detection circuit applied to piezoresistive transducer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000088891A (en) * | 1998-09-10 | 2000-03-31 | Shimadzu Corp | Bridge circuit and detector using the same |
| CN1465981A (en) * | 2002-06-29 | 2004-01-07 | 骆乃光 | Electric bridge for experiment |
| CN2657260Y (en) * | 2003-10-17 | 2004-11-17 | 王世评 | Indoor dc power supply unit |
| CN101738210A (en) * | 2008-11-14 | 2010-06-16 | 沈阳中科博微自动化技术有限公司 | Device and method for measuring resistance bridge sensor simultaneously supporting voltage excitation and current excitation |
| CN201600207U (en) * | 2009-11-03 | 2010-10-06 | 山东昌润科技有限公司 | Pressure transmitter circuit powered by single power supply |
| CN201830159U (en) * | 2010-10-11 | 2011-05-11 | 徐青春 | Adjustable direct current stabilized power supply |
| CN203775050U (en) * | 2014-03-27 | 2014-08-13 | 西安科技大学 | Adjustable DC regulated power supply with Zener diode test function |
| CN204013258U (en) * | 2014-05-15 | 2014-12-10 | 上海协度电子科技有限公司 | Double-sided screen is optimized power supply and double-sided screen system |
| CN204258266U (en) * | 2014-12-29 | 2015-04-08 | 河南玖龙塑料科技有限公司 | A kind of novel motor air inlet no-voltage protection device |
| CN205336135U (en) * | 2016-02-04 | 2016-06-22 | 山西大同大学 | Direct current voltage -stabilized source |
| CN205537689U (en) * | 2016-04-01 | 2016-08-31 | 广州红象医疗科技有限公司 | Foil gage zero setting circuit |
| CN107324195A (en) * | 2017-07-21 | 2017-11-07 | 佛山科学技术学院 | A kind of handrail elevator exigency stop system |
| CN107658663A (en) * | 2017-10-27 | 2018-02-02 | 江门市江海区华星灯饰材料有限公司 | A kind of connecting line of adjustable output voltage |
| CN210051350U (en) * | 2019-06-12 | 2020-02-11 | 五邑大学 | Detection circuit applied to piezoresistive sensor |
-
2019
- 2019-06-12 CN CN201910505351.0A patent/CN110220537A/en active Pending
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000088891A (en) * | 1998-09-10 | 2000-03-31 | Shimadzu Corp | Bridge circuit and detector using the same |
| CN1465981A (en) * | 2002-06-29 | 2004-01-07 | 骆乃光 | Electric bridge for experiment |
| CN2657260Y (en) * | 2003-10-17 | 2004-11-17 | 王世评 | Indoor dc power supply unit |
| CN101738210A (en) * | 2008-11-14 | 2010-06-16 | 沈阳中科博微自动化技术有限公司 | Device and method for measuring resistance bridge sensor simultaneously supporting voltage excitation and current excitation |
| CN201600207U (en) * | 2009-11-03 | 2010-10-06 | 山东昌润科技有限公司 | Pressure transmitter circuit powered by single power supply |
| CN201830159U (en) * | 2010-10-11 | 2011-05-11 | 徐青春 | Adjustable direct current stabilized power supply |
| CN203775050U (en) * | 2014-03-27 | 2014-08-13 | 西安科技大学 | Adjustable DC regulated power supply with Zener diode test function |
| CN204013258U (en) * | 2014-05-15 | 2014-12-10 | 上海协度电子科技有限公司 | Double-sided screen is optimized power supply and double-sided screen system |
| CN204258266U (en) * | 2014-12-29 | 2015-04-08 | 河南玖龙塑料科技有限公司 | A kind of novel motor air inlet no-voltage protection device |
| CN205336135U (en) * | 2016-02-04 | 2016-06-22 | 山西大同大学 | Direct current voltage -stabilized source |
| CN205537689U (en) * | 2016-04-01 | 2016-08-31 | 广州红象医疗科技有限公司 | Foil gage zero setting circuit |
| CN107324195A (en) * | 2017-07-21 | 2017-11-07 | 佛山科学技术学院 | A kind of handrail elevator exigency stop system |
| CN107658663A (en) * | 2017-10-27 | 2018-02-02 | 江门市江海区华星灯饰材料有限公司 | A kind of connecting line of adjustable output voltage |
| CN210051350U (en) * | 2019-06-12 | 2020-02-11 | 五邑大学 | Detection circuit applied to piezoresistive sensor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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