CN107015080A - Detection means for filter capacitor in PLC module - Google Patents
Detection means for filter capacitor in PLC module Download PDFInfo
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- CN107015080A CN107015080A CN201710236940.4A CN201710236940A CN107015080A CN 107015080 A CN107015080 A CN 107015080A CN 201710236940 A CN201710236940 A CN 201710236940A CN 107015080 A CN107015080 A CN 107015080A
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
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Abstract
This disclosure relates to which a kind of be used for the detection means of filter capacitor in PLC module.The detection means includes：Interface is detected, is connected for the port with the PLC module, the filter capacitor is accessed into the detection means；Signal amplification circuit, is connected with the detection interface, for the voltage signal of the detection interface input to be amplified；Detecting circuit, is connected with the signal amplification circuit, for the voltage signal after amplification to be carried out into detection；Output circuit, is connected with the detecting circuit, has a fluctuation for the voltage signal after detection, and the amplitude of fluctuation is when being more than predetermined voltage threshold, output alarm signal.So, PLC module need not be disassembled from system, disassembled also without by filter capacitor from PLC module, detection means can directly be connected with the port of PLC module and be detected, this saves detection time, workload is reduced, and avoids the damage of the element caused by dismounting.
Description
Technical field
This disclosure relates to PLC control fields, in particular it relates to which a kind of be used for the detection means of filter capacitor in PLC module.
Background technology
At present, programmable logic controller (PLC) (Programmable is used in the control system of many manufacturing enterprises in large quantities
Logic Controller, PLC) module (far module) is controlled.Because long-term work is under high temperature, vibration environment, PLC
Aging, hydraulic performance decline can occur for the subelement in module, so that can stop line failure.Wherein, PLC module breaks down
Filter capacitor (most of be electrochemical capacitor) hydraulic performance decline often in PLC module internal insulation power supply or the reason for damage.
Performance that can be periodically to the filter capacitor in PLC module insulating power supply is detected, ensures the normal operation of PLC module.
Filter capacitor in the insulating power supply of PLC module mainly includes power filtering capacitor and communication filter capacitor.To PLC
The detection of filter capacitor in the insulating power supply of module, traditional way is to disassemble PLC module from production line, then will
Internal filter capacitor is disassembled from PLC module, is detected with RLC tables or digital electric bridge.
The content of the invention
The purpose of the disclosure is to provide a kind of simple efficient, detection means for filter capacitor in PLC module.
To achieve these goals, the disclosure provides a kind of detection means for filter capacitor in PLC module.The inspection
Surveying device includes：Interface is detected, is connected for the port with the PLC module, the filter capacitor access detection is filled
Put；Signal amplification circuit, is connected with the detection interface, for the voltage signal of the detection interface input to be put
Greatly；Detecting circuit, is connected with the signal amplification circuit, for the voltage signal after amplification to be carried out into detection；Output circuit, with
The detecting circuit connection, has fluctuation for the voltage signal after detection, and the amplitude of fluctuation is more than predetermined voltage threshold
When, output alarm signal.
Alternatively, the detection means also includes power circuit, and the power circuit includes first voltage converter, opened
Pass, fuse, the first voltage converter include input, output end and earth terminal, wherein, the positive pole of the power circuit
Input connects one end of the switch by the fuse, another termination first voltage converter of the switch it is defeated
Enter end, the output end of the first voltage converter is the cathode output end of the power circuit, the negative pole of the power circuit
The earth terminal difference ground wire of input and the first voltage converter.
Alternatively, the detection means also include power indicating circuit, the power indicating circuit include the 9th resistance and
First light emitting diode, the positive pole that the anode of first light emitting diode connects the power circuit by the 9th resistance is defeated
Go out end, the minus earth line of first light emitting diode.
Alternatively, the filter capacitor includes power filtering capacitor, and the detection interface includes the first detection interface and the
One resistance, the positive pole of the first detection interface is connected by the first resistor with the cathode output end of the power circuit,
And be connected with the signal amplification circuit, the negative pole ground wire of the first detection interface.
Alternatively, the filter capacitor includes communication filter capacitor, and the detection interface includes the second detection interface, described
The positive pole of second detection interface is connected with the signal amplification circuit, the negative pole ground wire of the second detection interface.
Alternatively, the signal amplification circuit includes the first operational amplifier, the second operational amplifier, second voltage conversion
Device, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the first electric capacity,
Two electric capacity, the 3rd electric capacity and the 4th electric capacity, the second voltage converter include input, output end and earth terminal, described the
Six resistance are variable resistor.
Wherein, the output end of the input termination first voltage converter of the second voltage converter, and pass through institute
The first capacity earth line is stated, the output end of the second voltage converter passes through the 4th capacity earth line, first fortune
The second resistance and second electric capacity that the inverting input of calculation amplifier passes sequentially through series connection connect the detection interface, or
The 3rd resistor and the 3rd electric capacity that person passes sequentially through series connection connect the detection interface, first operational amplifier
Homophase input terminates the output end of the second voltage converter, and passes through the 4th capacity earth line, first computing
The output end of amplifier connects a fixing end of the 6th resistance by the 5th resistance, the 6th resistance another
The inverting input of fixed termination second operational amplifier, the output end of first operational amplifier passes through the described 4th
Resistance connects the inverting input of first operational amplifier, and the output end of second operational amplifier passes through the described 7th electricity
Resistance connects the inverting input of second operational amplifier, and connects by the 7th resistance slip of the 6th resistance
End, the homophase input of second operational amplifier terminates the output end of the second voltage converter, and passes through the described 8th
The cathode power supply end difference of resistance eutral grounding line, the cathode power supply end of first operational amplifier and second operational amplifier
Connect the cathode output end of the power circuit, the negative electricity source of first operational amplifier and second operational amplifier
Negative electricity source difference ground wire, the output end of second operational amplifier exports for the positive pole of the signal amplification circuit
End, the output end of second operational amplifier is the cathode output end of the signal amplification circuit.
Alternatively, the detecting circuit includes diode and the 5th electric capacity, wherein, the anode of the diode connects the letter
The cathode output end of number amplifying circuit, the negative electrode of the diode connects one end of the 5th electric capacity, the 5th electric capacity it is another
The cathode output end of the one termination signal amplification circuit, the two ends of the 5th electric capacity are the output end of the detecting circuit.
Alternatively, the output circuit includes：Drive module, the voltage signal for being exported in the detecting circuit has ripple
It is dynamic, and the amplitude of fluctuation is when being more than the predetermined voltage threshold, generates drive signal；Output module, with the drive module
Connection, for exporting the alarm signal according to the drive signal.
Alternatively, the drive module includes photoelectrical coupler, the tenth resistance, the 11st resistance, the 12nd resistance, the 6th
Electric capacity and triode, wherein, the electrode input end of the photoelectrical coupler connects the detecting circuit by the tenth resistance
Cathode output end, the negative input of the photoelectrical coupler connects the cathode output end of the detecting circuit, and passes through described
Six capacity earth lines, the cathode output end of the photoelectrical coupler connects the cathode output end of the power circuit, the photoelectricity coupling
The cathode output end of clutch connects the base stage of the triode by the 11st resistance, and the base stage of the triode passes through described
12nd resistance eutral grounding line, the grounded emitter line of the triode, the extremely described drive module of current collection of the triode
Output end.
Alternatively, the output module includes audio output submodule and/or luminous output sub-module, the audio output
Submodule includes the 13rd resistance, the 7th electric capacity and buzzer, wherein, one after the 7th electric capacity and buzzer parallel connection
End connects the cathode output end of the power circuit, the output end of another termination drive module by the 13rd resistance；
The luminous output sub-module includes the 14th resistance and the second light emitting diode, and the anode of second light emitting diode passes through
14th resistance connects the cathode output end of the power circuit, and the negative electrode of second light emitting diode connects the driving mould
The output end of block.
The detection means provided by above-mentioned technical proposal, is directly connected with the port of PLC module, can be by filter to be measured
In ripple electric capacity access detection means, and by the fluctuation signal of the electric circuit inspection voltage in detection means, in such manner, it is possible to directly from
The performance of filter capacitor is examined on filter effect.When the detection means that the disclosure is provided detects the filter capacitor in PLC module, no
Need to disassemble PLC module from system, it is not required that disassemble filter capacitor from PLC module, detection means
It can directly be connected and be detected with the port of PLC module, this saves detection time, reduce workload, and keep away
The damage of the element caused by dismounting is exempted from.
Other feature and advantage of the disclosure will be described in detail in subsequent embodiment part.
Brief description of the drawings
Accompanying drawing is, for providing further understanding of the disclosure, and to constitute a part for specification, with following tool
Body embodiment is used to explain the disclosure together, but does not constitute limitation of this disclosure.In the accompanying drawings：
Fig. 1 is the structured flowchart for the detection means that an exemplary embodiment is provided；
Fig. 2 is the schematic diagram for the PLC module interior power supply circuit that an exemplary embodiment is provided；
Fig. 3 is the circuit diagram for the detection means that an exemplary embodiment is provided.
Embodiment
It is described in detail below in conjunction with accompanying drawing embodiment of this disclosure.It should be appreciated that this place is retouched
The embodiment stated is merely to illustrate and explained the disclosure, is not limited to the disclosure.
From the above mentioned, detection at present for the filter capacitor performance in the insulating power supply of PLC module, is typically by PLC
Module is dismantled from production line, then filter capacitor to be measured inside PLC module is dismantled, and is detected with RLC tables or digital electric bridge.This
The detection method existence time length of sample, the problem of workload is big.It is old largely doing internal capacitance using the manufacturing enterprise of PLC module
It is highly difficult thing to change comprehensive examination.And it is costly, the normal operation of production line can be influenceed.
Filter capacitor in the insulating power supply of PLC module mainly includes power filtering capacitor and communication filter capacitor.This two
As long as individual filter capacitor has a damage, whole PLC module all can not normal work.Especially the latter damages, and can cause whole
Communication network is alarmed, and causes PLC system to be paralysed, and trouble point confirmation is extremely difficult.The detection means that the disclosure is provided can
The performance of the filter capacitor in its insulating power supply is detected by being connected directly to the port of PLC module, it is not necessary to dismantle PLC moulds
Block and filter capacitor, it is described in detail below.
The disclosure provides a kind of detection means for filter capacitor in PLC module, and Fig. 1 is that an exemplary embodiment is provided
Detection means structured flowchart.As shown in figure 1, the detection means 10 can include detection interface 11, signal amplification circuit
12nd, detecting circuit 13 and output circuit 14.
Wherein, detection interface 11 is used to be connected with the port of PLC module, and filter capacitor is accessed into detection means 10.Signal
Amplifying circuit 12 is connected with detection interface 11, for will detect that the voltage signal inputted at interface 11 is amplified.Detecting circuit
13 are connected with signal amplification circuit 12, for the voltage signal after amplification to be carried out into detection.Output circuit 14 and detecting circuit 13
Connection, has a fluctuation for the voltage signal after detection, and the amplitude of fluctuation is when being more than predetermined voltage threshold, exports alarm signal
Number.
Specifically, the port of PLC module can include power port and COM1.When detecting power filtering capacitor, inspection
The power port of PLC module can be connected to by surveying device, power filtering capacitor be accessed into detection means, it is PLC so to detect
The current fluctuation of modular power source；During detection communication filter capacitor, detection means can be connected to the COM1 (example of PLC module
Such as, the port of Profibus joints), by communication filter capacitor access detection means, it is PLC module communication power supply so to detect
Voltage pulsation.Detection interface 11 can be arranged to match with the port of PLC module, to facilitate connection.Detection means 10 connects
It is connected to behind the port of PLC module, the processing such as signal amplification, detection is carried out to the small fluctuation voltage detected, is compared, to sentence
The filter capacitor to be measured that breaks whether aging (hydraulic performance decline), and when being determined as aging, pointed out by output circuit.
By taking LG PLC module SMART I/O as an example, Fig. 2 is the PLC module internal electric source electricity that an exemplary embodiment is provided
The schematic diagram on road.As shown in Fig. 2 to detect power filtering capacitor C thereinaWhen, detection interface 11 can be connected to power supply
Positive pole (24V) interface and negative pole (0V) interface, i.e. power filtering capacitor CaTwo ends.Detect communication filter capacitor C thereinb
When, it can will detect that interface 11 is connected to 5 and 6 stitch of Profibus joints, that is, communicate filter capacitor CbTwo ends, thus
The filter capacitor to be detected has accessed detection means 10.
The electric signal of input detection device 10 is during through its processing of circuit, it is considered to which tested filter capacitor is filtered
Effect, if voltage signal has a fluctuation, and the amplitude of fluctuation is when being more than predetermined voltage threshold, can with output alarm signal,
Represent the filter capacitor hydraulic performance decline or damage.Wherein, predetermined voltage threshold can rule of thumb or experiment draw.
This way it is not necessary to which PLC module is disassembled from system, it is not required that filter capacitor is torn open from PLC module
Unload down, detection means can be detected by being directly connected with the port of PLC module, this makes it possible to directly confirm failure
Point, has saved detection time, reduces workload, and avoid the damage of the element caused by dismounting.Being used when stopping production should
Detection means carries out examination to PLC module, can avoid caused by the filter capacitor in the insulating power supply of PLC module is damaged
PLC system failure.
Power circuit can be provided with detection means, can also be with battery as power supply, so, detection means is just
The portable instrument of comparison can be made, facilitates the carrying of staff.Charging module is also provided with, battery can be given
Charging, then more enhance the convenience of detection means.
Fig. 3 is the circuit diagram for the detection means that an exemplary embodiment is provided.As shown in figure 3, detection means 10 can
With including power circuit 15.The power circuit 15 can include first voltage converter U1, switch S, fuse F.First electricity
Pressure converter U1 includes input Vin, output end vo ut and earth terminal GND.Wherein, the electrode input end Vin+ of power circuit 15
Switch S one end is connect by fuse F, S another termination first voltage converter U1 input Vin, first voltage is switched
Converter U1 output end vo ut is the cathode output end of power circuit 15.The negative input Vin- of power circuit 15 and first
Electric pressure converter U1 earth terminal GND difference ground wires.
In this embodiment, it could be arranged between the electrode input end Vin+ and negative input Vin- of power circuit 15
Powered by placing dry cell (for example, 12V).The charging being connected in parallel with dry cell is also provided with power circuit 15
Module 151.First voltage converter U1 for example could be arranged to can in the dc-dc of 12V-24V conversions, detection means 10
Powered with accessing 12V battery.
In order to indication detection device 10 power supply whether normal power supply, detection means 10 can also include power indicating circuit
16.As shown in figure 3, power indicating circuit 16 can include the 9th resistance R9 and the first light emitting diode D1.First light-emitting diodes
Pipe D1 anode connects the cathode output end of power circuit 15, the first light emitting diode D1 minus earth by the 9th resistance R9
Line.
So, when the cathode output end of power circuit 15 has electric current output, the first light emitting diode D1 lights, and work people
The power supply indicator that can just be set from tool housing of member know power supply whether normal work.
In one embodiment, when detection means 10 can be detected to power filtering capacitor, i.e., above-mentioned filter capacitor can
With including power filtering capacitor.In this embodiment, detection interface 11 can include first detection interface (including first detection connect
The positive pole 111 and first of mouth detects the negative pole 112 of interface) and first resistor R1.The positive pole 111 of first detection interface passes through first
Resistance R1 is connected with the cathode output end of power circuit 15, and is connected with signal amplification circuit 12, the negative pole of the first detection interface
112 ground wires.The connection of first detection interface and PLC module can for example be connected by the test pencil of universal meter.It is, can
With connected respectively with the two ends of a test pencil the first detection interface positive pole 111 and PLC module cathode power supply port (for example,
24V ports in Fig. 2), the two ends of another test pencil connect the negative pole 112 of the first detection interface and the negative pole of PLC module respectively
Power port (for example, 0V ports in Fig. 2).At this moment, if the output alarm signal of output circuit 14, shows that voltage signal has
Fluctuation, and the amplitude of fluctuation is more than predetermined voltage threshold, power filtering capacitor has been damaged.
Wherein, first resistor R1 is current-limiting resistance, can prevent detection test pencil short circuit, while inputting electricity as PLC module
The sample resistance of stream, voltage pulsation is converted to by the fluctuation of PLC module input current.
When the capacity decline of power filtering capacitor, degradation or loss factor increase, it is impossible to filter out on-off circuit production
Raw current fluctuation, this current fluctuation can be showed by power input, be powered by detection means 10 to PLC module
When can detect voltage pulsation from the output end of the power circuit 15 of detection means 10.
In one embodiment, when detection means 10 can be detected to communication filter capacitor, i.e., above-mentioned filter capacitor can
With including communication filter capacitor.In this embodiment, detection interface 11 can include second detection interface (including second detection connect
The positive pole 113 and second of mouth detects the negative pole 114 of interface).The positive pole 113 of second detection interface connects with signal amplification circuit 12
Connect, the ground wire of negative pole 114 of the second detection interface.The connection of second detection interface and PLC module can for example pass through
Profibus joints and Profibus flexible cables with shielding are connected.Return to the communication filter capacitor in Fig. 2, SMART I/O
CbBoth positive and negative polarity be respectively connected to 5 and 6 stitch in its COM1 (Profibus joints).If will be to interior in SMART I/O
The communication filter capacitor C of portion's power supplybDetected, the positive pole 113 and negative pole 114 of the second detection interface can respectively be passed through
Profibus flexible cables, 5 and 6 stitch being connected in Profibus joints, in order to be connect with the Profibus in SMART I/O
Head connection.Now, if the output alarm signal of output circuit 14, the communication filtered electrical of internal electric source in SMART I/O is shown
Hold CbDamage.
As communication filter capacitor CbWhen capacity decline, degradation or loss factor increase, filtering can be caused bad, made defeated
Go out the voltage pulsation increase of power supply.When voltage pulsation reaches predetermined voltage threshold, the output alarm signal of output circuit 14.
Fig. 3 is returned to, in one embodiment, signal amplification circuit 12 can include the first operational amplifier Y1, the second computing
Amplifier Y2, second voltage converter U2, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th electricity
Hinder R6, the 7th resistance R7, the 8th resistance R8, the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3 and the 4th electric capacity C4.Second
It is variable resistor that electric pressure converter U2, which can include input Vin, output end vo ut and earth terminal GND, the 6th resistance R6,.
Wherein, second voltage converter U2 input termination first voltage converter U1 output end, and pass through the first electricity
Hold C1 ground wires, second voltage converter U2 output end passes through the 4th electric capacity C4 ground wires.First operational amplifier Y1's is anti-
The second resistance R2 and the second electric capacity C2 that phase input passes sequentially through series connection connect the detection interface (positive pole of the first detection interface
111), or pass sequentially through series connection 3rd resistor R3 and the 3rd electric capacity C3 connect detection interface (second detection interface positive pole
113).First operational amplifier Y1 homophase input termination second voltage converter U2 output end, and pass through the 4th electric capacity C4
Ground wire.First operational amplifier Y1 output end connects a 6th resistance R6 fixing end, the 6th electricity by the 5th resistance R5
R6 the second operational amplifier Y2 of another fixation termination inverting input is hindered, the first operational amplifier Y1 output end passes through
4th resistance R4 connects the first operational amplifier Y1 inverting input.Second operational amplifier Y2 output end passes through the 7th resistance
R7 connects the second operational amplifier Y2 inverting input, and connects by the 7th resistance R7 the 6th resistance R6 sliding end.Second
Operational amplifier Y2 homophase input termination second voltage converter U2 output end, and pass through the 8th resistance R8 ground wires.The
One operational amplifier Y1 cathode power supply end and the second operational amplifier Y2 cathode power supply end are connecing power circuit 15 just respectively
Pole output end, the first operational amplifier Y1 negative electricity source and the second operational amplifier Y2 negative electricity source are grounded respectively
Line, the second operational amplifier Y2 output end is the cathode output end of signal amplification circuit 12, and the second operational amplifier Y2's is defeated
Go out cathode output end of the end for signal amplification circuit 12.
Wherein, the first operational amplifier Y1, the second electric capacity C2, the 3rd electric capacity C3, second resistance R2,3rd resistor R3 and
Four resistance R4 constitute the reverse scaling circuit of the first order, while the second electric capacity C2, second resistance R2, the 3rd electric capacity C3, the 3rd
Resistance R3 prevents low-frequency disturbance as the single order high-pass filter of input.Second operational amplifier Y2, the 5th resistance R5, the 6th
Resistance R6 and the 7th resistance R7 composition reverse scaling circuits in the second level, the 6th resistance R6's act as adjustment of sensitivity.
Second voltage converter U2 can be three terminal regulator LM7812.First operational amplifier Y1 and the second operation amplifier
Device Y2 can be LF353.First electric capacity C1 and the 4th electric capacity C4 can be electrochemical capacitor.
In one embodiment, detecting circuit 13 can include diode D and the 5th electric capacity C5.Diode D anode connects letter
The cathode output end of number amplifying circuit 12, diode D negative electrode connects the 5th electric capacity C5 one end, the 5th electric capacity C5 another termination
The cathode output end of signal amplification circuit 12, the 5th electric capacity C5 two ends are the output end of detecting circuit 13.
In one embodiment, output circuit 14 can include drive module 141 and output module 142.
Drive module 141 can be used for having fluctuation in the voltage signal that detecting circuit 13 is exported, and the amplitude of fluctuation is more than
During predetermined voltage threshold, drive signal is generated.Output module 142 is connected with drive module 141, for defeated according to drive signal
Go out alarm signal.
In the embodiment shown in fig. 3, drive module 141 can include photoelectrical coupler U3, the tenth resistance R10, the tenth
One resistance R11, the 12nd resistance R12, the 6th electric capacity C6 and triode Q.Wherein, photoelectrical coupler U3 electrode input end passes through
Tenth resistance R10 connects the cathode output end of detecting circuit 13, and photoelectrical coupler U3 negative input connects the negative of detecting circuit 13
Pole output end, and pass through the 6th electric capacity C6 ground wires.The positive pole that photoelectrical coupler U3 cathode output end connects power circuit 15 is defeated
Go out end, photoelectrical coupler U3 cathode output end connects triode Q base stage by the 11st resistance R11, and triode Q base stage is led to
Cross the 12nd resistance R12 ground wires, triode Q grounded emitter line, triode Q current collection extremely drive module 141 it is defeated
Go out end.
Wherein, photoelectrical coupler U3 for example can be PC817.Triode Q for example can be TIP41.Detecting circuit 13 is defeated
The signal gone out is transmitted to photoelectrical coupler U3, and when the amplitude of voltage pulsation is more than predetermined voltage threshold, signal passes through photoelectricity
Coupler U3 and triode Q are transmitted to output module 142.
In one embodiment, output module 142 can include audio output submodule and/or luminous output sub-module.
In the embodiment shown in fig. 3, audio output submodule can include the 13rd resistance R13, the 7th electric capacity C7 and
Buzzer U4.Wherein, one end after the 7th electric capacity C7 and buzzer U4 is in parallel connects power circuit 15 by the 13rd resistance R13
Cathode output end, the output end of another termination drive module 141.
Luminous output sub-module can include the 14th resistance R14 and the second light emitting diode D2.Second light emitting diode
D2 anode connects the cathode output end of power circuit 15 by the 14th resistance R14, and the second light emitting diode D2 negative electrode connects drive
The output end of dynamic model block 141.Can simultaneously it be pointed out by luminous and buzzing two ways in Fig. 3 embodiment.
The preferred embodiment of the disclosure is described in detail above in association with accompanying drawing, still, the disclosure is not limited to above-mentioned reality
The detail in mode is applied, in the range of the technology design of the disclosure, a variety of letters can be carried out with technical scheme of this disclosure
Monotropic type, these simple variants belong to the protection domain of the disclosure.
It is further to note that each particular technique feature described in above-mentioned embodiment, in not lance
In the case of shield, it can be combined by any suitable means.In order to avoid unnecessary repetition, the disclosure to it is various can
The combination of energy no longer separately illustrates.
In addition, can also be combined between a variety of embodiments of the disclosure, as long as it is without prejudice to originally
Disclosed thought, it should equally be considered as disclosure disclosure of that.
Claims (10)
1. a kind of be used for the detection means of filter capacitor in PLC module, it is characterised in that the detection means includes：
Interface is detected, is connected for the port with the PLC module, the filter capacitor is accessed into the detection means；
Signal amplification circuit, is connected with the detection interface, for the voltage signal of the detection interface input to be put
Greatly；
Detecting circuit, is connected with the signal amplification circuit, for the voltage signal after amplification to be carried out into detection；
Output circuit, is connected with the detecting circuit, has fluctuation for the voltage signal after detection, and the amplitude of fluctuation is more than
During predetermined voltage threshold, output alarm signal.
2. detection means according to claim 1, it is characterised in that the detection means also includes power circuit, described
Power circuit include first voltage converter, switch, fuse, the first voltage converter include input, output end and
Earth terminal, wherein, the electrode input end of the power circuit connects one end of the switch by the fuse, the switch
The input of another termination first voltage converter, the output end of the first voltage converter is the power circuit
The earth terminal difference ground wire of cathode output end, the negative input of the power circuit and the first voltage converter.
3. detection means according to claim 2, it is characterised in that the detection means also includes power indicating circuit,
The power indicating circuit includes the 9th resistance and the first light emitting diode, and the anode of first light emitting diode passes through described
9th resistance connects the cathode output end of the power circuit, the minus earth line of first light emitting diode.
4. detection means according to claim 1, it is characterised in that the filter capacitor includes power filtering capacitor, institute
Stating detection interface includes the first detection interface and first resistor, the positive pole of the first detection interface by the first resistor with
The cathode output end connection of the power circuit, and be connected with the signal amplification circuit, the negative pole of the first detection interface
Ground wire.
5. detection means according to claim 1, it is characterised in that the filter capacitor includes communication filter capacitor, institute
Stating detection interface includes the second detection interface, and the positive pole of the second detection interface is connected with the signal amplification circuit, described
The negative pole ground wire of second detection interface.
6. detection means according to claim 1, it is characterised in that the signal amplification circuit includes the first operation amplifier
Device, the second operational amplifier, second voltage converter, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th electricity
Resistance, the 7th resistance, the 8th resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity and the 4th electric capacity, the second voltage converter
Including input, output end and earth terminal, the 6th resistance is variable resistor,
Wherein, the output end of the input termination first voltage converter of the second voltage converter, and pass through described the
One capacity earth line, the output end of the second voltage converter is by the 4th capacity earth line, and first computing is put
The second resistance and second electric capacity that the inverting input of big device passes sequentially through series connection connect the detection interface, Huo Zheyi
It is secondary that the detection interface, the same phase of first operational amplifier are connect by the 3rd resistor and the 3rd electric capacity of series connection
The output end of the input termination second voltage converter, and pass through the 4th capacity earth line, first operation amplifier
The output end of device connects a fixing end of the 6th resistance by the 5th resistance, and another of the 6th resistance is fixed
The inverting input of second operational amplifier is terminated, the output end of first operational amplifier passes through the 4th resistance
The inverting input of first operational amplifier is connect, the output end of second operational amplifier is connect by the 7th resistance
The inverting input of second operational amplifier, and connect by the 7th resistance sliding end of the 6th resistance, institute
The homophase input for stating the second operational amplifier terminates the output end of the second voltage converter, and is connect by the 8th resistance
The cathode power supply end of ground wire, the cathode power supply end of first operational amplifier and second operational amplifier connects described respectively
The negative pole of the cathode output end of power circuit, the negative electricity source of first operational amplifier and second operational amplifier
Power end distinguishes ground wire, and the output end of second operational amplifier is the cathode output end of the signal amplification circuit, institute
The output end for stating the second operational amplifier is the cathode output end of the signal amplification circuit.
7. detection means according to claim 6, it is characterised in that the detecting circuit includes diode and the 5th electricity
Hold, wherein, the anode of the diode connects the cathode output end of the signal amplification circuit, and the negative electrode of the diode connects described
One end of 5th electric capacity, the cathode output end of another termination signal amplification circuit of the 5th electric capacity, the 5th electricity
The two ends of appearance are the output end of the detecting circuit.
8. detection means according to claim 1, it is characterised in that the output circuit includes：
Drive module, the voltage signal for being exported in the detecting circuit has fluctuation, and the amplitude of fluctuation is more than described make a reservation for
Voltage threshold when, generate drive signal；
Output module, is connected with the drive module, for exporting the alarm signal according to the drive signal.
9. detection means according to claim 8, it is characterised in that the drive module includes photoelectrical coupler, the tenth
Resistance, the 11st resistance, the 12nd resistance, the 6th electric capacity and triode, wherein, the electrode input end of the photoelectrical coupler leads to
The cathode output end that the tenth resistance connects the detecting circuit is crossed, the negative input of the photoelectrical coupler connects the detection
The cathode output end of circuit, and by the 6th capacity earth line, the cathode output end of the photoelectrical coupler connects the electricity
The cathode output end of source circuit, the cathode output end of the photoelectrical coupler connects the triode by the 11st resistance
Base stage, the base stage of the triode passes through the 12nd resistance eutral grounding line, the grounded emitter line of the triode, described three
The output end of the extremely described drive module of the current collection of pole pipe.
10. detection means according to claim 8, it is characterised in that the output module includes audio output submodule
And/or luminous output sub-module,
The audio output submodule includes the 13rd resistance, the 7th electric capacity and buzzer, wherein, the 7th electric capacity and described
One end after buzzer is in parallel connects the cathode output end of the power circuit by the 13rd resistance, and another termination is described to drive
The output end of dynamic model block；
The luminous output sub-module includes the 14th resistance and the second light emitting diode, the anode of second light emitting diode
The cathode output end of the power circuit is connect by the 14th resistance, the negative electrode of second light emitting diode connects the drive
The output end of dynamic model block.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111257709A (en) * | 2020-02-11 | 2020-06-09 | 邢台钢铁有限责任公司 | Method for insulation detection of 24V power line of PLC system |
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| US20100176788A1 (en) * | 2009-01-13 | 2010-07-15 | Foxnum Technology Co., Ltd. | Current detecting apparatus |
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