CN109358259A - A kind of system and method judging capacitance sensor working condition - Google Patents
A kind of system and method judging capacitance sensor working condition Download PDFInfo
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- CN109358259A CN109358259A CN201811169147.8A CN201811169147A CN109358259A CN 109358259 A CN109358259 A CN 109358259A CN 201811169147 A CN201811169147 A CN 201811169147A CN 109358259 A CN109358259 A CN 109358259A
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/64—Testing of capacitors
Abstract
The present invention relates to decision circuitry fields, more particularly to a kind of system and method for judging capacitance sensor working condition, system includes the capacitive sensing module of the capacitance signal issued for sensitive capacitance sensors, and connect capacitive sensing module and the oscillation module for generating oscillator signal, it further include current detection module, I/O conversion module, division module and judgment module, oscillation module traffic load electric current is to current detection module, load current is converted to output electric current by current detection module, I/O conversion module is converted to output voltage for electric current is exported, division module divides reference voltage at least one branch pressure voltage, and according to output voltage and branch pressure voltage output level, judgment module is according to the working condition of electrical level judging capacitance sensor.Electric current is exported by detection, and compares the size of output voltage and branch pressure voltage, so that the working condition of accurate judgement capacitance sensor, avoids the movement for executing mistake in laser cutting.
Description
Technical field
The present invention relates to decision circuitry fields, and in particular to it is a kind of judge capacitance sensor working condition system and side
Method.
Background technique
In laser cutting, capacitance sensor is an important component, and routine is installed on the lower part of cutting head, is used for
Distance of the induction nozzle to workpiece to be cut.
In cutting process, it is extremely important to obtain working condition locating for capacitance sensor.Traditionally, judge capacitance sensing
The method of device working condition is to issue frequency signal relevant to capacitance by oscillating circuit, then, height-regulating device judgement frequency
The size of rate value then judges nozzle impingement workpiece to be cut when frequency values are less than certain value, issues alarm signal and reminds operation
Personnel；When height-regulating device does not detect frequency signal, then judge that cable breaks, issues alarm signal and remind operator.
This method depends on the stability of oscillating circuit, if exception occurs in oscillating circuit, the frequency signal generated also will appear different
Often, lead to the movement that height-regulating device judges incorrectly and execution is wrong, cutting head can knock workpiece to be cut when serious, cause entirety
The damage of device.
Summary of the invention
The technical problem to be solved in the present invention is that in view of the above drawbacks of the prior art, providing a kind of judgement capacitor biography
The system and method for sense device working state solve the problems, such as to be unable to judge accurately capacitance sensor working condition.
To solve this technical problem, the present invention provides a kind of system for judging capacitance sensor working condition, the system
Capacitive sensing module including the capacitance signal issued for sensitive capacitance sensors, and connect capacitive sensing module and be used for
Generate the oscillation module of oscillator signal, it is characterised in that: the system also includes current detection module, I/O conversion module, partial pressures
Module and judgment module, the oscillation module traffic load electric current to current detection module, the current detection module will load
Electric current is converted to output electric current IOUT, the I/O conversion module will output electric current IOUTBe converted to output voltage VOUT, the partial pressure
Module is by reference voltage VCCPartial pressure is at least one branch pressure voltage V, and according to output voltage VOUTWith branch pressure voltage V output level,
The judgment module is according to the working condition of electrical level judging capacitance sensor.
Wherein, preferred version is: the current detection module includes sampling resistor RSENSE, with sampling resistor RSENSEConnection
Input resistance RIN, with input resistance RINThe operational amplifier of connection, and the MOS being connect with the output end of operational amplifier
Pipe, the normal phase input end and inverting input terminal of the operational amplifier are separately connected sampling resistor RSENSEBoth ends, the output
The formula of electric current is
Wherein, preferred version is: the I/O conversion module includes the output resistance R connecting with current detection moduleOUT, institute
The formula for stating output voltage is
Wherein, preferred version is: the division module includes reference voltage VCC, first partial pressure submodule, second partial pressure son
Module, resistance R1, resistance R5 and resistance R8, the first partial pressure submodule, the second partial pressure submodule, resistance R1, resistance R5 and
Resistance R8 with reference voltage VCCConnection, described first divides submodule for reference voltage VCCPartial pressure is the first partial pressure V1, described
Second divides submodule for reference voltage VCCPartial pressure is the second partial pressure V2。
Wherein, preferred version is: the first partial pressure submodule includes the first integrated comparator and the integrated ratio of connection first
Compared with the first level I_TEST1 of the output end of device, the second partial pressure submodule includes the second integrated comparator and connection second
The second electrical level I_TEST2 of the output end of integrated comparator, the normal phase input end connection resistance R1 of first integrated comparator,
Resistance R5, resistance R8 and reference voltage VCC, inverting input terminal connection output voltage VOUTIt is defeated with the positive of the second integrated comparator
Enter end, the normal phase input end of second integrated comparator is also connected with output voltage VOUT, inverting input terminal connection resistance R1,
Resistance R5, resistance R8 and reference voltage VCC, it is described first partial pressure formula beDescribed second
The formula of partial pressure is
Wherein, preferred version is: the division module receives output voltage VOUTV is divided with first respectively afterwards1With second
Divide V2It compares, the working condition includes side impact state, normal power supply state and cable broken string state；Work as output voltage
VOUTGreater than the first partial pressure V1When, the first level I_TEST1 is low level, and the second electrical level I_TEST2 is high level,
The judgment module judges the working condition of capacitance sensor for side impact state；As output voltage VOUTLess than the first partial pressure V1And
Greater than the second partial pressure V2When, the first level I_TEST1 and second electrical level I_TEST2 are high level, the judgment module
Judge the working condition of capacitance sensor for normal power supply state；As output voltage VOUTLess than the second partial pressure V2When, described first
Level I_TEST1 is high level, and the second electrical level I_TEST2 is low level, and the judgment module judges capacitance sensor
Working condition is cable broken string state.
Wherein, preferred version is: the first partial pressure submodule further includes connecting with the output end of the first integrated comparator
Pull-up resistor R2, and the 3.3V voltage connecting with pull-up resistor R2, the second partial pressure submodule further includes and the second collection
At the pull-up resistor R6 that the output end of comparator connects, and the 3.3V voltage being connect with pull-up resistor R6.
Wherein, preferred version is: the system also includes the frequencies for connecting and be used to detect frequency signal with oscillation module
Detection module.
The present invention also provides a kind of methods for judging capacitance sensor working condition, and system as described above is for realizing institute
Method is stated, the described method comprises the following steps:
The capacitance signal that capacitive sensing module sensitive capacitance sensors issue, and capacitance signal is transferred to oscillation module；
Oscillation module generates oscillator signal, and load current is transferred to current detection module；
Load current is converted to output electric current I by current detection moduleOUTAnd detect output electric current IOUTSize, and will output
Electric current is transferred to I/O conversion module；
I/O conversion module will export electric current IOUTBe converted to output voltage VOUT, and by output voltage VOUTIt is transferred to partial pressure mould
Block；
Division module is by reference voltage VCCPartial pressure is at least one branch pressure voltage V, and according to output voltage VOUTWith partial pressure electricity
V output level is pressed, and level is transferred to judgment module；
Judgment module is according to the working condition of electrical level judging capacitance sensor.
The beneficial effects of the present invention are compared with prior art, the present invention is by designing a kind of judgement capacitance sensor
The system and method for working condition export electric current by detection, and compare the size of output voltage and branch pressure voltage, thus
The working condition of accurate judgement capacitance sensor avoids the movement that mistake is executed in laser cutting.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is the structural block diagram of present system；
Fig. 2 is the circuit diagram of current detection module of the present invention；
Fig. 3 is the circuit diagram of current detection module of the present invention, I/O conversion module and division module；
Fig. 4 is the structural block diagram of frequency detection module of the present invention；
Fig. 5 is the flow diagram of the method for the present invention.
Specific embodiment
Now in conjunction with attached drawing, elaborate to presently preferred embodiments of the present invention.
As shown in Figures 1 to 4, the present invention provides a kind of preferred implementation of system for judging capacitance sensor working condition
Example.
Specifically, with reference to Fig. 1, a kind of system judging 10 working condition of capacitance sensor, the system comprises connection electricity
Hold the capacitive sensing module 1 of sensor 10 and the capacitance signal for the sending of sensitive capacitance sensors 10, and connection capacitor sense
It answers module 1 and the oscillation module 2 for generating oscillator signal, the capacitive sensing module 1 is transmitted after sensing capacitance signal
To oscillation module 2, the oscillation module 2 generates oscillator signal, and in conjunction with capacitance signal；The system also includes current detectings
Module 3, I/O conversion module 4, division module 5 and judgment module 6, the current detection module 3 connect oscillation module 2, the I/
O conversion module 4 connects current detection module 3, and the division module 5 connects I/O conversion module 4, the connection point of judgment module 6
Capacitance signal after oscillation is converted to load current I by die block 5, the oscillation module 2LOAD, and by load current ILOADTransmission
To current detection module 3, the current detection module 3 is by load current ILOADBe converted to output electric current IOUTAnd detect output electricity
Flow IOUTSize, at this point, the current detection module 3 will export electric current IOUTIt is transferred to I/O conversion module 4, the I/O modulus of conversion
Block 4 will export electric current IOUTBe converted to output voltage VOUT, the division module 5 is by reference voltage VCCPartial pressure is at least one partial pressure
Voltage V, and according to output voltage VOUTAt least one level is exported with branch pressure voltage V, the judgment module 6 is accurate according to level
Judge the working condition of capacitance sensor 10, if capacitance sensor 10 breaks down, the judgment module 6 can detect in time
Failure and issue alarm signal remind operator come maintenance or replacement.
Further, with reference to Fig. 2, the current detection module 3 includes sampling resistor RSENSE, with sampling resistor RSENSEEven
The input resistance R connectIN, with input resistance RINThe operational amplifier of connection, and connect with the output end of operational amplifier
Metal-oxide-semiconductor, the normal phase input end and inverting input terminal of the operational amplifier are separately connected sampling resistor RSENSEBoth ends, in detail
It says, the normal phase input end of the operational amplifier connects sampling resistor RSENSECathode, the anti-phase input of the operational amplifier
End connection input resistance RINSampling resistor R is reconnected afterwardsSENSEAnode, the load current ILOADFlow through sampling resistor RSENSE
After can generate pressure drop VSENSE, the IN that is connect with operational amplifier+And IN-Point having the same, therefore, the input resistance RIN
The voltage at both ends is equal to pressure drop VSENSE, flow through input resistance RINInput current beDue to operational amplifier
Booming income impedance operator, the input current IINOutput pin, the input current I can be flowed through by metal-oxide-semiconductorINWith output electricity
Flow IOUTIt is equal, it is comprehensive it is found that the output electric current IOUTFormula be
Still further, the I/O conversion module 4 includes the output resistance connecting with current detection module 3 with reference to Fig. 2
ROUT, pass through output resistance ROUT, can will export electric current IOUTBe converted to output voltage VOUT, the output voltage VOUTFormula be
Again specifically, with reference to Fig. 3, the current detection module 3 further includes the BNC connector J1 for connecting oscillation module 2, and
The current limliting self-recovery fuse F1 connecting with the pin 1 of BNC connector J1, when short-circuit conditions occur, the current limliting self- recoverage is protected
Dangerous silk F1 is disconnected, the output of limitation output electric current；Resistance R4 is above-mentioned sampling resistor RSENSE, with processor U1LT6101 and
Resistance R3, resistance R7 collectively constitute current detection module 3 and I/O conversion module 4.When BNC connector J1 connection oscillation module 2,
It has electric current and flows through resistance R4, will form output voltage V in the pin 1 of processor U1LT6101OUT.The division module 5 includes
Reference voltage VCC, the first partial pressure submodule, the second partial pressure submodule, resistance R1, resistance R5 and resistance R8, the first partial pressure
Module, the second partial pressure submodule, resistance R1, resistance R5 and resistance R8 with reference voltage VCCConnection, the first partial pressure submodule
Block and the second partial pressure submodule connect output voltage VOUT, described first divides submodule for reference voltage VCCPartial pressure is first point
Press V1, described second divides submodule for reference voltage VCCPartial pressure is the second partial pressure V2。
More specifically, the first partial pressure submodule includes the first integrated comparator and the integrated ratio of connection first with reference to Fig. 3
Compared with the first level I_TEST1 of the output end of device, the second partial pressure submodule includes the second integrated comparator and connection second
The second electrical level I_TEST2 of the output end of integrated comparator, the normal phase input end connection resistance R1 of first integrated comparator,
Resistance R5, resistance R8 and reference voltage VCC, inverting input terminal connection output voltage VOUTIt is defeated with the positive of the second integrated comparator
Enter end, the normal phase input end of second integrated comparator is also connected with output voltage VOUT, inverting input terminal connection resistance R1,
Resistance R5, resistance R8 and reference voltage VCC, the first partial pressure V1Formula beDescribed
Two partial pressure V2Formula beIt can thus be seen that the first partial pressure V1Greater than second point
Press V2。
In the present embodiment, with reference to Fig. 3, the working condition includes side impact state, normal power supply state and cable broken string
State；The division module 5 receives output voltage VOUTV is divided with first respectively afterwards1With the second partial pressure V2It compares, described
One integrated comparator can compare output voltage VOUTWith the first partial pressure V1Size, second integrated comparator can compare
Output voltage VOUTWith the second partial pressure V2Size；As output voltage VOUTGreater than the first partial pressure V1When, the first level I_
TEST1 is low level, and the second electrical level I_TEST2 is high level, and by the first level I_TEST1 and second electrical level I_
The level conditions of TEST2 are sent to judgment module 6, and the judgment module 6 judges the working condition of capacitance sensor 10 for side impact
State, the capacitance sensor 10 is just in abnormal work, sideways collisions with workpiece to be cut, and the judgment module 6 is sent out
Alarm signal reminds operator out；As output voltage VOUTLess than the first partial pressure V1And it is greater than the second partial pressure V2When, described first
Level I_TEST1 and second electrical level I_TEST2 is high level, and by the first level I_TEST1's and second electrical level I_TEST2
Level conditions are sent to judgment module 6, and the judgment module 6 judges the working condition of capacitance sensor 10 for normal power supply shape
State, the capacitance sensor 10 are working normally；As output voltage VOUTLess than the second partial pressure V2When, the first level I_
TEST1 is high level, and the second electrical level I_TEST2 is low level, and by the first level I_TEST1 and second electrical level I_
The level conditions of TEST2 are sent to judgment module 6, and the judgment module 6 judges the working condition of capacitance sensor 10 for cable
Broken string state, the capacitance sensor 10 can not work, and issue alarm signal and remind operator.
Wherein, with reference to Fig. 3, the first partial pressure submodule further include connect with the output end of the first integrated comparator it is upper
Pull-up resistor R2, and the 3.3V voltage connecting with pull-up resistor R2, the pull-up resistor R2 is by the current collection of the first integrated comparator
It is extremely clamped in high level, while playing metering function；The second partial pressure submodule further includes the output with the second integrated comparator
The pull-up resistor R6 of connection, and the 3.3V voltage connecting with pull-up resistor R6 are held, the pull-up resistor R6 integrates ratio for second
It is clamped compared with the collector of device in high level, while rise metering function.
Preferably, the frequency with reference to Fig. 4, the system also includes being connect with oscillation module 2 and for detecting frequency signal
Detection module 7, the frequency detection module 7 are also connect with judgment module 6, and the oscillation module 2 sends the signal after oscillation
To frequency detection module 7, the frequency detection module 7 detects the frequency values of signal, described when frequency values are less than a setting value
Judgment module 6 judges that capacitance sensor 10 collides workpiece to be cut；When frequency values are greater than a setting value, the judgment module
6 judge that capacitance sensor 10 works normally；When frequency detection module 7 does not detect frequency values, the judgment module 6 judges
Cable broken string, the capacitance sensor 10 can not work.The system combination frequency detection module 7, current detection module 3, I/O
Conversion module 4 and division module 5 can integrate progress by the level of detection output and the frequency of output, two ways
The judgement of 10 working condition of capacitance sensor, so as to improve the accuracy of judgement.
Among the above, the capacitive sensing module 1 is capacitive sensing head, can be connect with capacitance sensor 10, and electricity is received
Hold the capacitance signal of sensor 10；The oscillation module 2 is oscillating circuit；The current detection module 3 is current detecting
Circuit；The I/O conversion module 4 is I/O conversion circuit；The division module 5 is bleeder circuit；The judgment module 6
It is single-chip microcontroller, carries out the judgement operation of 10 working condition of capacitance sensor；The frequency detection module 7 is frequency detecting electricity
Road.
As shown in figure 5, the present invention also provides a kind of preferred embodiments of method for judging capacitance sensor working condition.
Specifically, with reference to Fig. 5, a method of judging capacitance sensor working condition, system as described above is for real
Existing the method, the described method comprises the following steps:
The capacitance signal that step 1, capacitive sensing module sensitive capacitance sensors issue, and capacitance signal is transferred to oscillation
Module；
Step 2, oscillation module generate oscillator signal, and load current are transferred to current detection module；
Load current is converted to output electric current I by step 3, current detection moduleOUTAnd detect output electric current IOUTSize, and
Output electric current is transferred to I/O conversion module；
Step 4, I/O conversion module will export electric current IOUTBe converted to output voltage VOUT, and by output voltage VOUTIt is transferred to
Division module；
Step 5, division module are by reference voltage VCCPartial pressure is at least one branch pressure voltage V, and according to output voltage VOUTWith
Branch pressure voltage V output level, and level is transferred to judgment module；
Step 6, judgment module are according to the working condition of electrical level judging capacitance sensor.
In conclusion the above is merely preferred embodiments of the present invention, being not intended to limit the scope of the present invention.
Any modification made all within the spirits and principles of the present invention, equivalent replacement, improve etc., it should be included in guarantor of the invention
It protects in range.
Claims (9)
1. a kind of system for judging capacitance sensor working condition, the system comprises the electricity issued for sensitive capacitance sensors
Hold the capacitive sensing module of signal, and connection capacitive sensing module and the oscillation module for generating oscillator signal, feature
Be: the system also includes current detection module, I/O conversion module, division module and judgment module, the oscillation module is passed
For transmission load electric current to current detection module, load current is converted to output electric current I by the current detection moduleOUT, the I/O
Conversion module will export electric current IOUTBe converted to output voltage VOUT, the division module is by reference voltage VCCPartial pressure is at least one
Branch pressure voltage V, and according to output voltage VOUTWith branch pressure voltage V output level, the judgment module is passed according to electrical level judging capacitor
The working condition of sensor.
2. system according to claim 1, it is characterised in that: the current detection module includes sampling resistor RSENSE, with
Sampling resistor RSENSEThe input resistance R of connectionIN, with input resistance RINThe operational amplifier of connection, and with operational amplifier
The metal-oxide-semiconductor of output end connection, the normal phase input end and inverting input terminal of the operational amplifier are separately connected sampling resistor RSENSE
Both ends, it is described output electric current formula be
3. system according to claim 2, it is characterised in that: the I/O conversion module includes connecting with current detection module
The output resistance R connectOUT, the formula of the output voltage is
4. system according to any one of claims 1 to 3, it is characterised in that: the division module includes reference voltage VCC,
One partial pressure submodule, the second partial pressure submodule, resistance R1, resistance R5 and resistance R8, the first partial pressure submodule, the second partial pressure
Submodule, resistance R1, resistance R5 and resistance R8 with reference voltage VCCConnection, described first divides submodule for reference voltage
VCCPartial pressure is the first partial pressure V1, described second divides submodule for reference voltage VCCPartial pressure is the second partial pressure V2。
5. system according to claim 4, it is characterised in that: the first partial pressure submodule includes the first integrated comparator
With the first level I_TEST1 of the output end of the first integrated comparator of connection, the second partial pressure submodule includes second integrated
The second electrical level I_TEST2 of the output end of the second integrated comparator of comparator and connection, the positive of first integrated comparator
Input terminal connects resistance R1, resistance R5, resistance R8 and reference voltage VCC, inverting input terminal connection output voltage VOUTWith second
The normal phase input end of the normal phase input end of integrated comparator, second integrated comparator is also connected with output voltage VOUT, reverse phase
Input terminal connects resistance R1, resistance R5, resistance R8 and reference voltage VCC, it is described first partial pressure formula beIt is described second partial pressure formula be
6. system according to claim 5, it is characterised in that: the division module receives output voltage VOUTAfter distinguish
With the first partial pressure V1With the second partial pressure V2It compares, the working condition includes side impact state, normal power supply state and cable broken string
State；As output voltage VOUTGreater than the first partial pressure V1When, the first level I_TEST1 is low level, the second electrical level I_
TEST2 is high level, and the judgment module judges the working condition of capacitance sensor for side impact state；As output voltage VOUTIt is small
V is divided in first1And it is greater than the second partial pressure V2When, the first level I_TEST1 and second electrical level I_TEST2 are high level,
The judgment module judges the working condition of capacitance sensor for normal power supply state；As output voltage VOUTLess than the second partial pressure
V2When, the first level I_TEST1 is high level, and the second electrical level I_TEST2 is low level, the judgment module judgement
The working condition of capacitance sensor is cable broken string state.
7. system according to claim 5, it is characterised in that: the first partial pressure submodule further includes and first integrates ratio
Compared with the pull-up resistor R2 that the output end of device connects, and the 3.3V voltage being connect with pull-up resistor R2, the second partial pressure submodule
Block further includes the pull-up resistor R6 connecting with the output end of the second integrated comparator, and the 3.3V electricity connecting with pull-up resistor R6
Pressure.
8. system according to claim 1, it is characterised in that: the system also includes connect with oscillation module and be used to examine
The frequency detection module of measured frequency signal.
9. a kind of method for judging capacitance sensor working condition, which is characterized in that system as described in any of the claims 1 to 8
System the described method comprises the following steps for realizing the method:
The capacitance signal that capacitive sensing module sensitive capacitance sensors issue, and capacitance signal is transferred to oscillation module；
Oscillation module generates oscillator signal, and load current is transferred to current detection module；
Load current is converted to output electric current I by current detection moduleOUTAnd detect output electric current IOUTSize, and electric current will be exported
It is transferred to I/O conversion module；
I/O conversion module will export electric current IOUTBe converted to output voltage VOUT, and by output voltage VOUTIt is transferred to division module；
Division module is by reference voltage VCCPartial pressure is at least one branch pressure voltage V, and according to output voltage VOUTWith branch pressure voltage V
Output level, and level is transferred to judgment module；
Judgment module is according to the working condition of electrical level judging capacitance sensor.
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| CN201811169147.8A CN109358259B (en) | 2018-10-08 | 2018-10-08 | System and method for judging working state of capacitive sensor |
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| CN201811169147.8A CN109358259B (en) | 2018-10-08 | 2018-10-08 | System and method for judging working state of capacitive sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111240272A (en) * | 2019-09-24 | 2020-06-05 | 浙江中自机电控制技术有限公司 | Trademark machine cutting knife ironing board controller |
| CN114383645A (en) * | 2020-10-16 | 2022-04-22 | 上海汽车集团股份有限公司 | Fault detection method of capacitive sensor in diesel engine and related equipment |
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| CN109358259B (en) | 2021-08-03 |
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