CN1595085A - Indicating device for detecting resistance type pressure sensing element with current mode - Google Patents
Indicating device for detecting resistance type pressure sensing element with current mode Download PDFInfo
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- CN1595085A CN1595085A CN 03158452 CN03158452A CN1595085A CN 1595085 A CN1595085 A CN 1595085A CN 03158452 CN03158452 CN 03158452 CN 03158452 A CN03158452 A CN 03158452A CN 1595085 A CN1595085 A CN 1595085A
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Abstract
It is a indicate apparatus for current mode resistance measurement pressure sensitive parts, which comprises current source, multiple groups of resistance, multiplexer, differential signal detector, amplifier, compensation and mock or digital transducer. It is to use the current source to provide current to one selected group of resistance by the multiplexer to generate a reference voltage and responds to the differential voltage changing with changes of the resistance to the differential signal detector. It uses the output of the compensation signal detector and finally translate the signals after amplifying and compensation of the amplifier into digit value through mock or digital transducer and submits to a micro processor and makes the differential voltage serve as pressure sensitive base.
Description
Technical field
The present invention relates to a kind of indicating device, particularly a kind of indicating device that detects the resistance-type pressure sensor with current-mode with resistance-type pressure sensor.
Background technology
Pressure sensor has been widely used on notebook computer and other electronic products.For example, pressure sensor is applied to the indicating device of notebook computer, can replace mouse function, uses finger to bestow pressure and has on the indicating device of pressure sensor, can be controlled in the pressure of direction up and down, with moving of corresponding mouse cursor.And pressure sensor can be divided into resistance-type and condenser type.Existing technology focuses on voltage divider principle and detects the resistance-type pressure sensor, or with current detecting capacitive pressure sensing element.
Fig. 1 is the synoptic diagram of resistance-type pressure sensor, it places resistance R X+, RX-, RY+ and RY-on the different azimuth under the pressure panels 10, response finger is bestowed pressure in pressure panels 10, makes be stressed influence and being out of shape of resistance R X+, RX-, RY+ and RY-, causes its resistance value to change.Fig. 2 is the synoptic diagram of the stressed coordinate of resistance-type pressure sensor.The direction of pressure sensor being bestowed pressure is decided to be X-axis, Y-axis and Z axle.According to the direction of X-axis and Y-axis, place resistance R X+, RX-, RY+ and RY-respectively, to detect the numerical value of bestowing pressure at X-axis, Y-axis and Z axle.When the pressure of bestowing the X+ direction during in pressure sensor, resistance R X+ resistance value increases and the RX-resistance value reduces; When the pressure of bestowing the Z-direction during in pressure sensor, the resistance value of resistance R X+, RX-, RY+ and RY-increases simultaneously.
The indicating device of this type mainly is divided into the indicating device of four-wire type and six line formulas at present, designs with voltage divider principle.Fig. 3 is the circuit diagram of the indicating device 20 of known four-wire type.Reference resistance 22 is connected between pressure sensor 23 and the power supply Vs, and pressure sensor 23 comprises resistance R X+, RX-, RY+ and RY-, and resistance R X+ and RY+ one end connect reference resistance 22, the end ground connection of resistance R X-and RY-.The resistance value of resistance R X+, RX-, RY+ and RY-must equate, therefore must compensate with precision resistance.The input end 24a of operational amplifier 24 is connected between resistance R X+ and the RX-, and the input end 26a of operational amplifier 26 is connected between resistance R Y+ and the RY-, and the input end 28a of operational amplifier 28 is connected between resistance R X+ and the RY+.Operational amplifier 24,26 and 28 input end 24b, 26b and 28b connect reference voltage Vdac through resistance 30 and 32 voltage after partial, with by the different magnitude of voltage of reference voltage Vdac input, to detect the force value of X-axis, Y-axis and Z axle.Resistance 34 serial connection electric capacity 36 backs are in parallel with resistance 32, and electric capacity 36 is connected between the drain electrode and source electrode of transistor 38, the grid connection control signal of transistor 38.To detect X-axis is example, and reference voltage Vdac input voltage value makes operational amplifier 24 actions, detects the dividing potential drop result of resistance R X+ and RX-.When beginning to detect X-axis pressure, counter (not shown) Reset Status and transistor 38 open circuits, this moment, the input end 24b voltage of operational amplifier 24 rose with electric capacity 36 chargings, when operational amplifier 24 transitions, stop the counting of counter, its numerical value is the force value of detection on X-direction.In like manner, can be by identical detection mode detection Y-axis and the force value on the Z-direction.
Fig. 4 is the circuit diagram of the indicating device 40 of known six line formulas, reference resistance 42 is connected between pressure sensor 43 and the power supply ZM, pressure sensor 43 comprises resistance R X+, RX-, RY+ and RY-, resistance R X-connects resistance R X+, RY-and RY+, power supply XP, XM, YP and YM connect resistance R X+, RX-, RY+ and RY-respectively, the resistance value of resistance R X+, RX-, RY+ and RY-must equate, therefore must compensate with precision resistance.The input end 44a of operational amplifier 44 is connected between resistance R X+ and the RX-, and another input end 44b connects reference voltage Vdac through resistance 46 and 48 voltage after partial, to provide a level by reference voltage Vdac.Reference voltage Vdac is the voltage through over-compensation, and utilizes voltage divider principle to detect the force value of X-axis, Y-axis and Z axle.To detect X-axis is example, and power supply ZM, YP and YM do not give any current potential, and power supply XP provide noble potential, and power supply XM provide zero potential, makes the input end 44a of operational amplifier 44 be (XP+XM)/2 at the current potential that is not stressed.And X-axis is under the influence that is stressed, resistance R X+ and RX-change thereupon, the indicating device 40 of six line formulas is promptly judged the applied pressure value at the dividing potential drop ratio, via the voltage amplification of operational amplifier 44 with dividing potential drop, by D/A 50 partial pressure value is converted to digital value again.In like manner, when detecting Y-axis pressure, power supply ZM, XP and XM do not give any current potential, and power supply YP provide noble potential, and power supply YM provide zero potential, make the input end 44a of operational amplifier 44 be (YP+YM)/2 at the current potential that is not stressed; When detecting the Z axial pressure, power supply YP and YM do not give any current potential, and power supply ZM provide noble potential, and power supply XP and XM provide zero potential, make the input end 44a of operational amplifier 44 be (XP+ZM)/2 at the current potential that is not stressed.
In the indicating device of this quasi-tradition, its pressure sensor is with voltage divider principle detected pressures value, therefore, in the indicating device of four-wire type or six line formulas, the employed reference resistance of pressure sensor must be a precision resistance, and each detection resistance R X+, RX-, RY+ and RY-must equate that still meeting produces drift on the manufacture craft of resistance, usually need the additional strings connecting resistance to compensate, the resistance value of resistance R X+, RX-, RY+ and RY-is equated.Therefore, a kind of new indicating device becomes that we are desired.
Summary of the invention
Fundamental purpose of the present invention is to propose a kind of indicating device with current-mode detection resistance-type pressure sensor, and the resistance of this pressure sensor need not use precision resistance, to reduce cost.
According to the present invention, a kind of indicating device with current-mode detection resistance-type pressure sensor comprises the current source supply of current; Many group electrical response pressurizeds and change resistance value, these many group resistance are optionally connected this electric current, produce a reference voltage when pressurized not, produce a differential voltage when pressurized; Differential signal detector detects this differential voltage and produces differential signal; And analog/digital converter is changed this differential signal and is become a digital signal.
Description of drawings
For those of ordinary skills, from the following conjunction with figs. that is described in detail, the present invention can more clearly be understood, and its above-mentioned and other purpose and advantage will become more obvious, wherein:
Fig. 1 is the synoptic diagram of resistance-type pressure sensor;
Fig. 2 is the synoptic diagram of the stressed coordinate of resistance-type pressure sensor;
Fig. 3 is the circuit diagram of the indicating device of known four-wire type;
Fig. 4 is the circuit diagram of the indicating device of known six line formulas;
Fig. 5 is a system block diagrams of the present invention;
Fig. 6 is the present invention detects the indicating device of resistance-type pressure sensor with current-mode a functional block diagram;
Fig. 7 shows the inside composition of differential signal detector 66;
Fig. 8 is the equivalent electrical circuit that the present invention detects the force value of X-direction; And
Fig. 9 is the DC level synoptic diagram that the present invention detects resistance terminal voltage.
Description of reference numerals
10 pressure panels
The indicating device of 20 four-wire types
22 reference resistances
23 pressure sensors
24 operational amplifiers
The 24a input end
The 24b input end
26 operational amplifiers
The 26a input end
The 26b input end
28 operational amplifiers
The 28a input end
The 28b input end
30 resistance
32 resistance
34 resistance
36 electric capacity
38 transistors
The indicating device of 40 6 line formulas
42 reference resistances
43 pressure sensors
44 operational amplifiers
The 44a input end
The 44b input end
50 analog/digital converters
52 microcontrollers
54?SRAM
56?ROM
58 digital squares
60 indicating devices with current-mode detected pressures sensing element
61 pressure sensors
62 multiplexers
64 current sources
66 differential signal detector
6602 electric pressure converters
6604 converter
68 compensators
70 amplifiers
72 analog/digital converters
74 microcontrollers
The voltage level that 80 former resistance values are detected
82 resistance values increase the voltage level that is detected
84 resistance values reduce the voltage level that is detected
Embodiment
Fig. 5 is a system block diagrams of the present invention, native system comprises microcontroller 52, SRAM54, ROM56, digital square 58 and with the indicating device 60 of current-mode detected pressures sensing element, between the indicating device 60 of microcontroller 52, SRAM54 and ROM56 and current-mode detected pressures sensing element with digital square 58 as interface.
Fig. 6 is with the functional block diagram of the indicating device 60 of current-mode detected pressures sensing element, comprises pressure sensor 61, and it has resistance R X+, RX-, RY+ and RY-, represents X+, X-, Y+ and Y-direction respectively.Resistance R X+ two ends are X1+ and X2+, and resistance R X-two ends are X1-and X2-, and resistance R Y+ two ends are Y1+ and Y2+, and resistance R Y-two ends are Y1-and Y2-.When not bestowing pressure with finger, the resistance value of resistance R X+, RX-, RY+ and RY-is approximately equal.Multiplexer 62, its input end connects resistance R X+, RX-, RY+ and RY-, with the resistance of selecting to detect.Current source 64 connects the output of multiplexer 62, flow to selecteed resistance R X+, RX-, RY+ and RY-so that electric current I to be provided.The variation of current source 64 Control current I, with at pressure sensor 61 not during pressurized, flow through resistance R X+, RX-, RY+ and RY-of Control current I produces voltage Vs.The input end of differential signal detector 66 connects the output of multiplexer 62, to detect the terminal voltage (V1-V2) at resistance two ends, terminal voltage (V1-V2) is deducted voltage Vs to obtain differential voltage Δ V.Compensator 68 is connected the output of differential signal detector 66 with amplifier 70, to compensate respectively and to amplify differential voltage Δ V.Analog/digital converter 72 connects the output terminal of amplifier 70, is digital signal with the analog signal conversion with amplifier 70 outputs, and transfers to microcontroller 52 by digital square 58 and handle.The indicating device 60 that detects the resistance-type pressure sensor with current-mode is technical what integrate, can integrate with the control IC of capacitive touch screen.Fig. 7 shows the inside composition of differential signal detector 66, comprise electric pressure converter 6602 and converter 6604, electric pressure converter 6602 can use for example electric voltage displacement device, it is at pressure sensor 61 not during pressurized, the resistance pressure reduction of adjusting pressure sensor 61 is to voltage Vs, converter 6604 these differential electrical of conversion are pressed into a current signal, and for example can using, conduction amplifier realizes.
Fig. 8 is the equivalent electrical circuit of the present invention when detecting the force value of X-direction.Multiplexer 62 selects to connect two ends X1+ and the X2+ input of resistance R X+, and current source 64 provides electric current I, and when not bestowing pressure, the electric current I of current source 64 makes resistance R X+ produce voltage Vs, and current source 64 is produced by current mirroring circuit or other circuit.Current source 64 has multiple variation, and for example the 16*16 kind changes, its adjustable variable current I, and with at pressure sensor 61 not during pressurized, flow through resistance R X+, RX-, RY+ and RY-of Control current I produces voltage Vs.Current source 64 is by the variation of the switching plus-minus modulation electric current I of circuit, and is therefore insensitive for the manufacture craft drift of resistance R X+, RX-, RY+ and RY-, do not influence the accuracy with the indicating device 60 of current-mode detected pressures sensing element.Current source 64 is by the terminal voltage (V1-V2) of differential signal detector 66 detection resistance R X+, and with when not bestowing pressure, the modulation electric current I makes the terminal voltage (V1-V2) of resistance R X+ equal Vs, to adjust the pressure reduction of voltage V1 and V2.When bestowing pressure with finger, differential signal detector 66 detects the pressure reduction of voltage V1 and V2, the pressure reduction of voltage V1 and V2 is deducted voltage Vs obtaining differential voltage Δ V, and with amplifier 70 differential voltage Δ V is amplified.68 pairs of differential voltage Δs of compensator V does accurate compensation, because that current compensation control is not easy than voltage compensation control is affected by noise, therefore, compensator 68 is with current system control, moreover, have the circuit arrangement design and be easy to advantage.Again via simulation right/digital quantizer 72 is converted to digital signal with current value.
According to Fig. 8, when not bestowing pressure, provide electric current I with the indicating device 60 of current-mode detected pressures sensing element by current source 64, so that the pressure reduction of the voltage V1 at X1+ and X2+ two ends and V2 is Vs, and fixed current is at Is.When bestowing pressure, resistance R X+ response pressure produces distortion, its resistance value changes thereupon, therefore, the pressure reduction of voltage V1 and V2 changes with the resistance value of resistance R X+, indicating device 60 detects the pressure reduction of voltage V1 and V2 by differential signal detector 66, and pressure reduction is deducted voltage Vs obtains differential voltage Δ V.Because current source 64 is fixed as Is with electric current I, therefore detect the differential voltage Δ V variation delta R of resistance R X+ as can be known, principle of work of the present invention, but promptly be the variation that cooperates the detection detected pressures of above-mentioned electric current principle and resistance R X+, RX-, RY+ and RY-.The detection X-axis is the variation according to resistance R X+ and RX-, and the detection Y-axis is the variation according to resistance R Y+ and RY-, and detection Z axle is the variation according to resistance R X+, RX-, RY+ and RY-.
Fig. 9 is the DC level synoptic diagram that the present invention detects resistance terminal voltage, adjusts electric current I according to current source 64, is not stressed and when being out of shape at resistance, make voltage V1 be about 2.16V, voltage V2 is about 1.16V, according to the voltage level 80 that former resistance value detected, its pressure reduction A is V1-V2, promptly
A＝(V1-V2)＝1V (EQ-1)。When increasing at the resistance stress deformation, voltage V1 is greater than 2.16V, and voltage V2 increases the voltage level 82 that is detected less than 1.16V according to resistance value, and its pressure reduction is V1-V2, promptly
B=(V1-V2)=1V+ Δ R * I (EQ-2), wherein, Δ R represents the changes in resistance amount.When reducing at the resistance stress deformation, voltage V1 is less than 2.16V, and voltage V2 reduces the voltage level 84 that is detected greater than 1.16V according to resistance value, and its pressure reduction C is V1-V2, promptly
C=(V1-V2)=1V-Δ R * I (EQ-3), wherein, Δ R represents the changes in resistance amount.With change detected amount Δ R, and use the result of motion analysis of the present invention according to Fig. 7, can detect the direction and the strength of exerting pressure.The resistance value that action of the present invention is included in resistance R X+ increases, and the resistance value of resistance R X-reduces, and it is X+ that representative is subjected to force direction.Resistance value at resistance R X+ reduces, and the resistance value of resistance R X-increases, and it is X-that representative is subjected to force direction.Resistance value at resistance R Y+ increases, and the resistance value of resistance R Y-reduces, and it is Y+ that representative is subjected to force direction.Resistance value at resistance R Y+ reduces, and the resistance value of resistance R X-increases, and it is Y-that representative is subjected to force direction.When the resistance value of resistance R X+, RX-, RY+ and RY-increased simultaneously, it was Z-that representative is subjected to force direction.Resistance in all directions is symmetrical property resistance.
The present invention is simple with the application circuit of the indicating device of current-mode detected pressures sensing element, and owing to mainly is that therefore more known indicating device has better noise resisting ability with current system control and detection differential signal.Moreover, the present invention uses the current-mode detected pressures, need not use reference resistance and extra operational amplifier accurately, and known indicating device, be to use voltage divider principle, very responsive for the drift of resistance manufacturing process, it is a big shortcoming of known technology, and the present invention is insensitive for the drift of resistance manufacturing process with the current-mode detected pressures, and great improvement is arranged.
More than the narration done for preferred embodiment of the present invention be purpose for illustrating, and be not intended to limit the present invention the form that accurately discloses, based on above instruction or to make an amendment or change from embodiments of the invention study be possible, embodiment is for explaining orally principle of the present invention and allow those of ordinary skills utilize the present invention to select in practical application with various embodiment and narrate, and technological thought attempt of the present invention is decided by following claim and equivalence thereof.
Claims (9)
1. one kind is detected the indicating device of resistor pressure sensing element with current-mode, comprising:
Current source, supply of current;
Many group resistance, response pressurized and change resistance value, these many group resistance are optionally connected this electric current, produce a reference voltage when pressurized not, produce a differential voltage when pressurized;
Differential signal detector produces a differential signal to detect this differential voltage; And
Analog/digital converter becomes a digital signal to change this differential signal.
2. indicating device as claimed in claim 1 more comprises multiplexer, connects to organize resistance, to select and should connect this electric current by many group resistance more.
3. indicating device as claimed in claim 1, wherein this differential signal is a current signal.
4. indicating device as claimed in claim 1, wherein this differential signal detector comprises:
Electric pressure converter, with at these many group resistance not during pressurized, adjust should the ohmically pressure reduction of many groups to this reference voltage; And
Converter is pressed into a current signal to change this differential electrical.
5. indicating device as claimed in claim 3 more comprises:
Compensator is to finely tune this reference voltage; And
Current amplifier is to amplify this current signal.
6. indicating device as claimed in claim 1, the resistance value that wherein should organize resistance approximately equal more.
7. indicating device as claimed in claim 1, the resistance value that wherein should organize resistance unequal more.
8. indicating device as claimed in claim 1 wherein should comprise symmetrical property resistance by many group resistance.
9. indicating device as claimed in claim 1 wherein should each group expression one direction of many group resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03158452 CN1280636C (en) | 2003-09-10 | 2003-09-10 | Indicating device for detecting resistance type pressure sensing element with current mode |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03158452 CN1280636C (en) | 2003-09-10 | 2003-09-10 | Indicating device for detecting resistance type pressure sensing element with current mode |
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| Publication Number | Publication Date |
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| CN1595085A true CN1595085A (en) | 2005-03-16 |
| CN1280636C CN1280636C (en) | 2006-10-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03158452 Expired - Fee Related CN1280636C (en) | 2003-09-10 | 2003-09-10 | Indicating device for detecting resistance type pressure sensing element with current mode |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101183912B (en) * | 2007-10-11 | 2012-02-01 | 电子科技大学 | Multi-way signal multiplexing device |
| CN102128699B (en) * | 2010-01-18 | 2012-02-29 | 胜华科技股份有限公司 | Sensing method for touch pressure |
| CN102637098A (en) * | 2011-02-10 | 2012-08-15 | 瑞鼎科技股份有限公司 | Touch sensing device |
| CN103674074A (en) * | 2013-11-30 | 2014-03-26 | 成都国科海博信息技术股份有限公司 | Transmitter with excellent performance |
| CN104823138A (en) * | 2013-09-10 | 2015-08-05 | 深圳纽迪瑞科技开发有限公司 | Pressure-sensitive touch screen and touch display screen and electronic device |
| CN105283743A (en) * | 2013-06-05 | 2016-01-27 | 日本写真印刷株式会社 | Pressure detection device and input device |
| CN109818621A (en) * | 2019-02-26 | 2019-05-28 | 深圳大学 | Voltage-to-digit converter and electric resistance sensor reading circuit |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI423088B (en) * | 2009-12-31 | 2014-01-11 | Wintek Corp | Method of measuring touch pressure |
-
2003
- 2003-09-10 CN CN 03158452 patent/CN1280636C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101183912B (en) * | 2007-10-11 | 2012-02-01 | 电子科技大学 | Multi-way signal multiplexing device |
| CN102128699B (en) * | 2010-01-18 | 2012-02-29 | 胜华科技股份有限公司 | Sensing method for touch pressure |
| CN102637098A (en) * | 2011-02-10 | 2012-08-15 | 瑞鼎科技股份有限公司 | Touch sensing device |
| CN102637098B (en) * | 2011-02-10 | 2015-04-01 | 瑞鼎科技股份有限公司 | Touch sensing device |
| CN105283743A (en) * | 2013-06-05 | 2016-01-27 | 日本写真印刷株式会社 | Pressure detection device and input device |
| CN104823138A (en) * | 2013-09-10 | 2015-08-05 | 深圳纽迪瑞科技开发有限公司 | Pressure-sensitive touch screen and touch display screen and electronic device |
| CN104823138B (en) * | 2013-09-10 | 2017-10-03 | 深圳纽迪瑞科技开发有限公司 | A kind of pressure inductive touch-screen and touch display screen and electronic equipment |
| CN103674074A (en) * | 2013-11-30 | 2014-03-26 | 成都国科海博信息技术股份有限公司 | Transmitter with excellent performance |
| CN109818621A (en) * | 2019-02-26 | 2019-05-28 | 深圳大学 | Voltage-to-digit converter and electric resistance sensor reading circuit |
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| Publication number | Publication date |
|---|---|
| CN1280636C (en) | 2006-10-18 |
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Granted publication date: 20061018 Termination date: 20170910 |