CN109540073A - A kind of anti-electromagnetic interference circuit of proportion expression angular displacement sensor - Google Patents
A kind of anti-electromagnetic interference circuit of proportion expression angular displacement sensor Download PDFInfo
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- CN109540073A CN109540073A CN201811329130.4A CN201811329130A CN109540073A CN 109540073 A CN109540073 A CN 109540073A CN 201811329130 A CN201811329130 A CN 201811329130A CN 109540073 A CN109540073 A CN 109540073A
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- electromagnetic interference
- measured capacitance
- displacement sensor
- angular displacement
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/22—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring angles or tapers; for testing the alignment of axes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The present invention relates to a kind of anti-electromagnetic interference circuit of proportion expression angular displacement sensor, including measured capacitance Cx, analog switch K1, K2, K4, K4, phase inverter S1A, S2A, S3A, S4A, crystal oscillator XTL1, operational amplifier D1.The characteristics of circuit is that the charge-discharge circuit of comparative example formula angular displacement sensor carries out reasonable Anti-interference Design, guarantees that parasitic capacitance and stray capacitance in circuit will not convert voltage to charge and discharge and impact.The anti-electromagnetic interference circuit principle is simple, practical, high reliablity, and the Electro Magnetic Compatibility of control system where can effectively improving it has good engineering practical value.
Description
Technical field
The invention belongs to technical field of electricity, and in particular to a kind of electromagnetism interference electricity of proportion expression angular displacement sensor
Road.
Background technique
Angular displacement sensor is widely used in the various aspects of China's modernization construction, has volume using angle displacement measurement
The features such as small, inexpensive, measurement accuracy is high.
Different types of angular displacement sensor has the characteristics that different: potentiometer type angular displacement sensor structure is simple, measurement
Range is wide, but there is contact friction, and dynamic response is poor；Grating angular displacement sensor precision is high, easily digitizes, but to environmental requirement
It is higher；Synchronizer angular displacement precision is high, easily digitizes, but circuit is more complex；Laser type angular displacement sensor precision is high, but equipment
Complexity, it is at high cost；Hall sensor angular displacement sensor structure is simple, at low cost, but precision is lower.And proportion expression displacement sensing
Device can realize differential compensation from principle, improve measurement accuracy, and body is smaller, and high reliablity, structure is simple, low in energy consumption, non-
Often it is suitable for aerospace field.
In some pairs of higher fields of control system EMC Requirements, it is desirable that the matched proportion expression angle of its control system
Displacement sensor EMC Requirements with higher.In the case, proportion expression angular displacement sensor interlock circuit is carried out
Electromagnetism interference design will become inevitable choice；Therefore effectively reliable electromagnetism interference design is one urgently to be solved
System problem.
Summary of the invention
The purpose of the present invention:
The purpose of the present invention is to propose to a kind of anti-electromagnetic interference circuit of proportion expression angular displacement sensor, comparative example formula angle positions
Capacitor charge and discharge circuit in displacement sensor carries out anti-EMC Design, avoids parasitic capacitance and stray capacitance to the shadow of circuit
It rings.
The technical scheme adopted by the invention is as follows:
A kind of anti-electromagnetic interference circuit of proportion expression angular displacement sensor, including measured capacitance Cx, analog switch K1, K2,
K4, K4, phase inverter S1A, S2A, S3A, S4A, crystal oscillator XTL1, operational amplifier D1；
Wherein, crystal oscillator XTL1 output end is sequentially connected in series with phase inverter S1A, S2A, S3A, S4A；S1A output termination mould
The control terminal of quasi- switch K1, the control terminal of S2A output termination analog switch K2, the control terminal of S3A output termination analog switch K3,
The control terminal of S4A output termination analog switch K4；The one end analog switch K1 ground connection, 2 feet of another termination measured capacitance Cx, simulation
Mono- termination power VCC of switch K2,1 foot of another termination measured capacitance Cx, analog switch K3 mono- terminate 2 feet of measured capacitance Cx,
Minus 2 foot of input of another termination operational amplifier D1, the one end analog switch K4 ground connection, 1 foot of a termination measured capacitance Cx.
It is characterized in that, the anti-electromagnetic interference circuit further includes feedback resistance Rf, feedback capacity Cf, operational amplifier D1
1 foot of output and minus 2 foot of input between parallel connection be connected to feedback capacity Cf and feedback resistance Rf, to measured capacitance Cx charge and discharge electricity output
Voltage is filtered.
It is characterized in that, the anti-electromagnetic interference circuit further includes capacitor C, minus 2 foot of the input of operational amplifier D1 and defeated
The indirect capacitor C for entering positive 3 foot, is filtered measured capacitance Cx charge and discharge output voltage.
It is characterized in that, K1 is connected with K2, K3 and K4 are broken as charged state in charging process, measured capacitance Cx is filled
Electricity arrives VC；In discharge process, K1 and K2 are disconnected, and K3 is connected with K4, is discharged over the ground by switch K4.
Beneficial effects of the present invention:
The advantages of technical solution of the present invention, is carried out by the capacitor charge and discharge circuit in comparative example formula angular displacement sensor
Anti- EMC Design avoids the influence of parasitic capacitance and stray capacitance to circuit.Circuit of the present invention is simple, improves product electricity
Magnetic compatibility, has good engineering practical value.
Detailed description of the invention
Fig. 1 is the schematic diagram of circuit of the present invention
Specific embodiment
Present invention is further described in detail with reference to the accompanying drawings of the specification.
Referring to figure 1, a kind of anti-electromagnetic interference circuit of proportion expression angular displacement sensor, comparative example formula angular displacement pass
The capacitor charge and discharge circuit of sensor carries out electromagnetism interference design.In the circuit, CxFor measured capacitance, 1 foot of measured capacitance with
Charging/discharging voltage is connected, 2 feet ground connection.By CS1, CS2As measured capacitance C in circuitxThe parasitic capacitance abstract model at both ends, Cp1
~Cp4As analog switch each in circuit and measured capacitance CxBetween stray capacitance abstract model.In measurement CxWhen, simulation
Switch K1, K2, K4, K4 are connected and disconnect according to certain timing under the clock pulses drive control of crystal oscillator and phase inverter.
One complete charge and discharge process is divided into two steps: firstly, K1 is connected with K2, K3 and K4 are broken as charged state, it will
Measured capacitance CxIt is charged to VC.Then capacitor CxFull of charge Qx=VCCx.During the charging process, parasitic capacitance CS1And stray capacitance
Cp2, also it is charged to VCIf CN=CS1+CP2, then CS1、CP2On charging charge be QN=VCCN。CS2、CP1、CP3Both ends all connect
Ground, therefore there is no charging charge.When K1 is connected with K2, control K1 ratio K2 is first connected.K1, which is first connected, can make stray capacitance CP1
Both ends are all first grounded.After the conducting of K2 in this way, only charge to measured capacitance Cx, without to stray capacitance CP1Charging, to eliminate
CP1Influence to measured capacitance Cx.
After the completion of charging process, K1 and K2 are disconnected, and K3 is connected with K4, into discharge condition.Measured capacitance Cx and parasitism
Capacitor CS1, stray capacitance Cp2It will be discharged over the ground by switch K4, it can be seen that CS1、CP2During discharge, QNDirectly by
K4 is released to ground.Therefore, QNGenerated electric current is without measured capacitance CxWith the feedback resistance and feedback capacity R of amplifierf、Cf。
And when K3 conducting, CP3One end ground connection, the other end is by amplifier input inversion end, and void is short and is grounded, and both end voltage is identical, therefore
There is no charge injection and outflow.And measured capacitance CxOn charge QxWhen releasing, since K3 is connected, the feedback in amplifier will lead to
Resistance and feedback capacity Rf、CfUpper generation discharge current I, therefore discharge current I is only by measured capacitance CxOn charging charge QxCertainly
Determine size.The feedback resistance and feedback capacity R of amplifierf、CfInput inversion end is accessed, the input positive terminal of amplifier is to be directly grounded
's.With the empty short characteristic of amplifier, current potential is identical with reverse phase terminal potential in amplifier positive terminal, therefore it is defeated from amplifier to work as discharge current I
Outlet is through RfWhen flowing into reverse side, output voltage V is generatedf=IcRf, the VfIt is also uniquely by charging charge Qx=VCCxIt determines.
In this manner it is possible to prevent parasitic capacitance CS1, CS2, stray capacitance Cp1- Cp4Influence.K3 is controlled to be connected and disconnect prior to K4, this
Sample first establishes access before discharge current I generation, after such K4 conducting, in discharge process, does not just have charge loss.
When carrying out the design of proportion expression angular displacement sensor, reasonable electromagnetic compatibility is taken to set its capacitor charge and discharge circuit
Meter.The circuit theory is simple, and electromagnetism interference effect is good, has good engineering practical value.
Claims (4)
1. a kind of anti-electromagnetic interference circuit of proportion expression angular displacement sensor, including measured capacitance Cx, analog switch K1, K2, K4,
K4, phase inverter S1A, S2A, S3A, S4A, crystal oscillator XTL1, operational amplifier D1；
Wherein, crystal oscillator XTL1 output end is sequentially connected in series with phase inverter S1A, S2A, S3A, S4A；S1A output termination simulation is opened
Close the control terminal of K1, the control terminal of S2A output termination analog switch K2, the control terminal of S3A output termination analog switch K3, S4A
The control terminal of output termination analog switch K4；The one end analog switch K1 ground connection, 2 feet of another termination measured capacitance Cx, simulation are opened
Mono- termination power VCC of K2,1 foot of another termination measured capacitance Cx are closed, analog switch K3 mono- terminates 2 feet of measured capacitance Cx, separately
Minus 2 foot of input of one termination operational amplifier D1, the one end analog switch K4 ground connection, 1 foot of a termination measured capacitance Cx.
2. a kind of anti-electromagnetic interference circuit of proportion expression angular displacement sensor as described in claim 1, which is characterized in that described
Anti-electromagnetic interference circuit further includes feedback resistance Rf, 1 foot of output of feedback capacity Cf, operational amplifier D1 and input minus 2 foot it
Between parallel connection be connected to feedback capacity Cf and feedback resistance Rf, measured capacitance Cx charge and discharge output voltage is filtered.
3. a kind of anti-electromagnetic interference circuit of proportion expression angular displacement sensor as claimed in claim 2, which is characterized in that described
Anti-electromagnetic interference circuit further includes capacitor C, minus 2 foot of the input of operational amplifier D1 and the indirect capacitor C for inputting positive 3 foot,
Measured capacitance Cx charge and discharge output voltage is filtered.
4. a kind of anti-electromagnetic interference circuit of proportion expression angular displacement sensor as claimed in claim 3, which is characterized in that charging
In the process, K1 is connected with K2, K3 and K4 are broken as charged state, and measured capacitance Cx is charged to VC；In discharge process, K1 and K2
It disconnects, K3 is connected with K4, is discharged over the ground by switch K4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811329130.4A CN109540073A (en) | 2018-11-09 | 2018-11-09 | A kind of anti-electromagnetic interference circuit of proportion expression angular displacement sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811329130.4A CN109540073A (en) | 2018-11-09 | 2018-11-09 | A kind of anti-electromagnetic interference circuit of proportion expression angular displacement sensor |
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| Publication Number | Publication Date |
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| CN109540073A true CN109540073A (en) | 2019-03-29 |
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| CN201811329130.4A Pending CN109540073A (en) | 2018-11-09 | 2018-11-09 | A kind of anti-electromagnetic interference circuit of proportion expression angular displacement sensor |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2504647Y (en) * | 2001-10-30 | 2002-08-07 | 杨三序 | Stray immunity portable capacitance meter adopting four-phase detection technology |
| CN1465951A (en) * | 2002-06-28 | 2004-01-07 | 中国科学院声学研究所 | Area-changing capacitance analog modulation output type angular displacement sensor |
| CN1793788A (en) * | 2005-12-28 | 2006-06-28 | 天津大学 | Digital metal floater flowmeter based on proportional electric capacity angle measuring principle |
| CN201508416U (en) * | 2009-10-29 | 2010-06-16 | 郑建民 | Antijamming capacitive sensor |
| CN207797995U (en) * | 2018-03-06 | 2018-08-31 | 四川萨密特科技发展有限公司 | A kind of angle sensor circuit based on Hall chip |
-
2018
- 2018-11-09 CN CN201811329130.4A patent/CN109540073A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2504647Y (en) * | 2001-10-30 | 2002-08-07 | 杨三序 | Stray immunity portable capacitance meter adopting four-phase detection technology |
| CN1465951A (en) * | 2002-06-28 | 2004-01-07 | 中国科学院声学研究所 | Area-changing capacitance analog modulation output type angular displacement sensor |
| CN1793788A (en) * | 2005-12-28 | 2006-06-28 | 天津大学 | Digital metal floater flowmeter based on proportional electric capacity angle measuring principle |
| CN201508416U (en) * | 2009-10-29 | 2010-06-16 | 郑建民 | Antijamming capacitive sensor |
| CN207797995U (en) * | 2018-03-06 | 2018-08-31 | 四川萨密特科技发展有限公司 | A kind of angle sensor circuit based on Hall chip |
Non-Patent Citations (2)
| Title |
|---|
| 李学清: "一种高频抗杂散电容的小电容测量电路", 《仪表技术与传感器》 * |
| 赵雪英 等: "一种小电容检测方法-充放电法", 《沈阳工业大学学报》 * |
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Application publication date: 20190329 |