CN101126745A - Method and system for open loop and short circuit failure diagnosis for nitrogen phosphorus detector - Google Patents
Method and system for open loop and short circuit failure diagnosis for nitrogen phosphorus detector Download PDFInfo
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- CN101126745A CN101126745A CNA2006101112067A CN200610111206A CN101126745A CN 101126745 A CN101126745 A CN 101126745A CN A2006101112067 A CNA2006101112067 A CN A2006101112067A CN 200610111206 A CN200610111206 A CN 200610111206A CN 101126745 A CN101126745 A CN 101126745A
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Abstract
The utility model discloses an automatic diagnosing method and system used for a nitrogen-phosphorus detector bead open and short circuit fault. The nitrogen-phosphorus detector comprises a bead power supply circuit which supplies power for the bead with a transformer. The fault diagnosing method comprises the steps for measuring the output voltage of the bead power supply circuit and the current in the transformer primary winding, and the steps for judging whether the output voltage is lower than a first voltage threshold value or higher than a second voltage threshold value. If the output voltage is higher than the second voltage threshold value, then whether the current is lower than the first current threshold value is further judged, if yes, open fault is reported; if the output voltage is lower than the first voltage threshold value, then whether the current is higher than the second current threshold value is further judged, if yes, short circuit fault is reported. The first voltage threshold value is lower than the second voltage threshold value and the first current threshold value is lower than the second current threshold value.
Description
Technical field
Relate generally to gas chromatography detector of the present invention relates in particular to the method and system that open fault and the short trouble of pearl in the nitrogen phosphorous detector are diagnosed.
Background technology
Nitrogen phosphorous detector (NPD) is a kind of gas chromatography detector of ionization type, and it has very high selectivity and sensitivity for the organic principle that comprises nitrogen (N) and/or phosphorus (P).Nitrogen phosphorous detector is widely used in aspects such as environmental monitoring, food security inspection, industrial hygiene, pharmacy application and toxicology.
NPD is a kind of dynamo-electric chemical system of complexity, and its core component is the pearl (bead) of being made by the glass of the alkalinous metal that comprises rubidium or caesium etc. usually.During work, there is small quantity of hydrogen (H
2) and the environment of air under, by electrical heating method (for example passing through electric resistance heater) pearl is heated to 600～800 ℃, on pearl, to form catalytically active surface.When introducing contained the sample of nitrogen (N) or phosphorus (P), having an effect and produce negative ion in the surface of nitrogen phosphate material and pearl, and moves under electric field action, thereby produce signal.
Fig. 1 shows the structure diagram as the NPD of a gas chromatograph part.In Fig. 1, only schematically illustrated requisite part concerning principle of the present invention being described and using, main contents of the present invention have been desalinated on ground in order to avoid a presumptuous guest usurps the role of the host.
As shown in Figure 1, the gas chromatograph mainboard links to each other with NPD circuit board 102 by signalling channel 106 with firmware 101.Gas chromatograph mainboard and firmware 101 comprise the master microprocessor (not shown), it controls the operation of each master/subsystem, shows the heating and cooling of control furnace temperature program such as user interface, with the PC compunication, control operation of each detecting device that comprises NPD or the like.Signalling channel 106 is the passages that are used for transmission signals between gas chromatograph mainboard and firmware 101 and NPD circuit board 102, and it for example can be low-voltage differential signal (LVDS) passage.
NPD circuit board 102 comprises and is used for pearl feed circuit 104 that pearl 103 is powered, and links to each other with electrometer 105 that the current signal that is used for transmitting from pearl 103 converts voltage signal to.Well known to a person skilled in the art to be, also may comprise multiple assembly and circuit in addition on gas chromatograph mainboard and firmware 101 and the NPD circuit board 102, though in Fig. 1 the position and the annexation of also not shown for simplicity's sake these assemblies and circuit.In addition, though among Fig. 1 and not shown, the voltage signal that electrometer 105 can be converted to it offers gas chromatograph mainboard and firmware 101 to carry out signal Processing and demonstration.
In normal operation, above-mentioned voltage signal indicate the nitrogen phosphorus composition existence whether and the size of amount.But,, when for example open circuit appears in the line between pearl 103 self or pearl 103 and the pearl feed circuit 104, just can not produce signal output if fault has taken place.Serious situation is when pearl self or line short circuit more, if the untimely safeguard measure of taking just is easy to burn pearl even circuit board.Therefore, the pearl of NPD is opened a way and short circuit diagnosis is necessary.
The pearl open circuit and the short circuit diagnostic method of prior art mainly contain manual diagnosis and automatic diagnosis two classes.Manually diagnosis is to use the instrument of multimeter and so on directly circuit to be tested by the technician who accepted special training, and its efficient, cost and convenience are all unsatisfactory.
Automatic diagnosis method normally adds current detection circuit in pearl feed circuit 104, and detected signal is offered the gas chromatograph mainboard and firmware 101 is handled, thereby realizes real-time diagnosis and monitoring.
Fig. 2 is a kind of structure diagram that has the pearl feed circuit 104 of current measurement circuit of the prior art.As shown in Figure 2, be in series with current sense resistor 206, when electric current flows through pearl 103, produce voltage drop V_CSR at current sense resistor 206 two ends at the output terminal of pearl feed circuit.Differential amplifier circuit 207 amplifies the voltage V_CSR at current sense resistor 206 two ends, and will be sent to the gas chromatograph mainboard by the signal that amplification obtains and firmware 101 is handled.Miscellaneous part shown in Fig. 2 will be described in conjunction with Fig. 3 hereinafter.
There are the following problems for automatic diagnosis method shown in Figure 2.At first, the resistance of pearl 103 is very little usually, and for example in the 6890NPD of Agilent, bead resistance approximately is 0.6～0.9 Ω.Voltage and power consumption that the current sense resistor 206 of therefore, connecting with pearl 103 can change on the pearl are distributed.Because pearl is very complicated parts, therefore any voltage or change of power consumption all can influence its chemical reaction state, and this is a problem of can not ignore.
And the primary side of the transformer 203 of pearl feed circuit 104 is earth-free, therefore must use the voltage V_CSR at 207 pairs of current sense resistor 206 two ends of differential amplifier circuit to amplify.The affiliation that adds of differential amplifier circuit 207 significantly improves the complicacy and the cost of design.
Summary of the invention
A technical scheme of the present invention provides a kind of method that open fault and the short trouble of nitrogen phosphorous detector pearl are diagnosed of being used for, described nitrogen phosphorous detector comprises and is used for by the pearl feed circuit of a transformer to described pearl power supply, described method for diagnosing faults comprises the output voltage of measuring the pearl feed circuit and the step of the electric current in the primary winding, and judges whether described output voltage is lower than first voltage threshold or is higher than the step of second voltage threshold.If described output voltage is higher than described second voltage threshold, then further judge whether described electric current is lower than first current threshold, if then report open fault; And if described output voltage is lower than described first voltage threshold, judge then whether described electric current is higher than second current threshold, if then report short trouble.Described first voltage threshold is lower than described second voltage threshold, and described first current threshold is lower than described second current threshold.
Another technical scheme of the present invention provides a kind of system that open fault and the short trouble of nitrogen phosphorous detector pearl are diagnosed of being used for, described nitrogen phosphorous detector comprises and is used for by the pearl feed circuit of a transformer to described pearl power supply, described fault diagnosis system is characterised in that and comprises with lower member: be coupled with the current detecting unit of the electric current in the detection of primary winding with the elementary winding of described transformer, with the output signal amplification of described current detecting unit and the amplifying unit of output, and be used for having judged whether to take place the open fault of pearl or the automatic diagnostic device of short trouble according to the output signal of described amplifying unit.
Description of drawings
Read following embodiment in conjunction with the accompanying drawings, present invention will become more fully understood and purpose, feature and advantage, in the accompanying drawings:
Fig. 1 shows the structure diagram of nitrogen phosphorous detector (NPD).
Fig. 2 is a kind of structure diagram that has the pearl feed circuit of current measurement circuit of the prior art.
Fig. 3 is the structure diagram of the pearl feed circuit that have current measurement circuit of the embodiment of the invention.
Fig. 4 is the pearl open circuit of the embodiment of the invention and the process flow diagram of short circuit automatic diagnosis method.
Embodiment
For the ease of understanding the present invention better, some embodiment of the present invention will be described below.But should be realized that, these embodiment just can embody the concrete example of spirit of the present invention, it is exemplary but not exhaustive, and those skilled in the art is under the instruction of these embodiment, be easy to the following specific embodiment that provides is made alternative, distortion and improved, so the present invention is not limited to following specific embodiment.In addition, in this manual, some known structure, parts, feature, method are not elaborated, main contents of the present invention have been desalinated on ground in order to avoid a presumptuous guest usurps the role of the host.In the accompanying drawings, unless specialize, identical or similar label is represented identical or similar parts.
Fig. 3 shows the structure diagram of the pearl feed circuit 104 that have current measurement circuit of one embodiment of the invention.Below with reference to Fig. 3, each building block and the principle of work of pearl feed circuit 104 are carried out brief description.
The setting value BV_SET of pearl voltage is input in the pearl feed circuit 104 by an input end of operational amplification circuit 201, and another input end of operational amplification circuit 201 receives the pearl voltage feedback signal BV_FEEDBACK of self-feedback ciucuit 205.The output terminal of operational amplification circuit 201 is connected to PWM module 202, and PWM module 202 provides the voltage of the elementary winding 211 that outputs to transformer 203.PWM module 202 changes the dutycycle of the pwm signal of its output according to the output signal of operational amplification circuit 201, thereby changes the pearl voltage BV of pearl feed circuit 104 via transformer 203.
The voltage of exporting from the secondary winding 212 of transformer 203 carries out just having obtained pearl voltage BV after the filtering through power supply output filter circuit 204, and pearl voltage BV provides the operating voltage to pearl 103.On the other hand, pearl voltage BV also is provided for feedback circuit 205.Feedback circuit 205 generates pearl voltage feedback signal BV_FEEDBACK and is entered into operational amplification circuit 201 according to the value of pearl voltage BV again, and the design of this feedback control loop makes pearl feed circuit 104 value of pearl voltage BV can be adjusted to the value of BV_SET defined.
As shown in Figure 3, current detecting unit 301 links to each other with the elementary winding 211 of transformer 203, with the electric current that flows through in the detection of primary winding 211.The signal that current detecting unit 301 obtains detection offers amplifying unit 302 and amplifies, and the signal BI after will amplifying then offers unshowned automatic diagnostic device.In one embodiment, automatic diagnostic device is arranged in the middle of the firmware of gas chromatograph mainboard and firmware 101.
In one embodiment, current detecting unit 301 is made of the current sense resistor that is connected in series with elementary winding 211.In this embodiment, because the primary side of transformer 203 is a ground connection, therefore only the voltage of the unearthed side of current sense resistor need be offered amplifying unit 302 as the output signal of current detecting unit 301.Like this, because the input signal of amplifying unit 302 is to earth signal rather than differential signal, so its circuit design can be simplified greatly than differential amplifier circuit.In one embodiment, amplifying unit 302 is made of a single-valve amplification circuit.
Fig. 4 shows the pearl open circuit of one embodiment of the invention and the process flow diagram of short circuit automatic diagnosis method.In this automatic diagnosis method, utilize the output signal BI of amplifying unit shown in Figure 3 302 and the pearl voltage BV that is input in the feedback circuit 205 to judge whether to have taken place open circuit or short trouble.The value of signal BI is directly proportional with electric current in the elementary winding 211.Though there is nonlinear relationship in the electric current between primary winding and the secondary winding, so signal BI is directly proportional with the electric current that flows through in the pearl 103; But under the certain situation of circuit structure and each assembly model, the variation tendency of signal BI and pearl electric current is certain.In the embodiment shown in fig. 4, the value of signal BI is big more, show that the pearl electric current is big more, and the value of signal BI is more little, shows that the pearl electric current is more little.
In addition, in the embodiment shown in fig. 4, the pearl electric current is very low if pearl voltage is very high, then determines to have taken place open fault; And if pearl voltage is very low but the pearl electric current is very high, then determine to have taken place short trouble.The height of voltage, electric current is determined by signal BV and BI are compared with preset threshold value respectively.
As shown in Figure 4, in step 401, diagnostic procedure begins.In step 402, judge that whether pearl voltage BV is less than the first voltage threshold BV_LOW.If pearl voltage BV then forwards step 406 to less than the first voltage threshold BV_LOW ("Yes" in the step 402); If pearl voltage BV is not less than the first voltage threshold BV_LOW ("No" in the step 402), then forward step 403 to.
In step 403, judge that whether pearl voltage BV is greater than the second voltage threshold BV_HIGH.In the present embodiment, the first voltage threshold BV_LOW is less than the second voltage threshold BV_HIGH.If pearl voltage BV then forwards step 404 to greater than the second voltage threshold BV_HIGH ("Yes" in the step 403); If pearl voltage BV is not more than the second voltage threshold BV_HIGH ("No" in the step 403), illustrate the open fault fault that yet is not short-circuited both do not take place that forward step 408 to, diagnosis finishes.
In step 404, judge whether the signal BI relevant with the pearl electric current is less than or equal to the first current threshold BI_LOW.If obtain sure judged result ("Yes" in the step 404), then open fault has taken place in explanation, reports open fault in step 405, and diagnosis finishes at step 408 place then.In one embodiment, the report to open fault is by the predetermined flag position set in the predetermined register is realized.In another embodiment, the report to open fault is to interrupt realizing by triggering in the processor on the gas chromatograph mainboard.Well known to a person skilled in the art that variety of way may be used to realize the processing of the described report open fault of step 405 among Fig. 4, and the foregoing description should not be understood as that and limits the scope of the present invention.
And if signal BI then illustrates open fault does not take place greater than the first current threshold BI_LOW ("No" in the step 404), forward step 408 to, diagnosis finishes.
Again pearl voltage BV is described less than the situation of the first voltage threshold BV_LOW ("Yes" in the step 402) below.In step 406, judge that whether signal BI is more than or equal to the second current threshold BI_HIGH.In the present embodiment, the first current threshold BI_LOW is less than the second current threshold BI_HIGH.If signal BI is more than or equal to the second current threshold BI_HIGH ("Yes" in the step 406), then short trouble has taken place in explanation, forwards step 407 report short trouble to, forwards step 408 then to, and diagnosis finishes.
And if signal BI is less than the second current threshold BI_HIGH ("No" in the step 406), illustrate the open fault fault that yet is not short-circuited both do not take place that forward step 408 to, diagnosis finishes.
In one embodiment, above-mentioned first and second voltage thresholds are set to and satisfy following relation:
0＜BV_LOW＜BV_HIGH＜BV_WORK
Wherein, BV_WORK is the normal working voltage of pearl.
As shown in Figure 4, when pearl voltage less than first voltage threshold, promptly during BV＜BV_LOW, account for voltage is in the interval of the fault that might be short-circuited; And when pearl voltage greater than second voltage threshold, promptly during BV＞BV_HIGH, account for voltage is in the interval that open fault might take place.It will be appreciated by those skilled in the art that, even above-mentioned Rule of judgment is become BV≤BV_LOW and BV 〉=BV_HIGH, can implement the present invention too, obtain identical technique effect, therefore such distortion still falls within the scope of the present invention.
On the other hand, first and second current thresholds should satisfy following relation:
0＜BI_LOW＜BI_HIGH
As shown in Figure 4, when the value of signal BI is less than or equal to first current threshold, promptly during BI≤BI_LOW, illustrate that electric current is in the interval that open fault might take place; And when the value of signal BI more than or equal to second current threshold, promptly during BI 〉=BI_HIGH, illustrate that electric current is in the interval of the fault that might be short-circuited.It will be appreciated by those skilled in the art that, even above-mentioned Rule of judgment is become BI＜BI_LOW and BI＞BI_HIGH, can implement the present invention too, obtain identical technique effect, therefore such distortion still falls within the scope of the present invention.
The concrete numerical value of above-mentioned voltage threshold BV_LOW and BV_HIGH and current threshold BI_LOW and BI_HIGH is relevant with the factors such as characteristic, NPD system architecture and circuit element parameter of pearl itself, can determine by the method for concrete NPD product being carried out short circuit and open circuit experiment.Particularly, the model of the system architecture of any NPD product, circuit parameter and selected pearl all is certain, can repeatedly test with simulation and the situation of the short circuit of pearl and open fault take place and record many group magnitudes of voltage and current values, then the voltage and current measured value of selected threshold when guaranteeing fault taken place be included in above-mentioned might be short-circuited or the interval of open fault within get final product.
For example, according to a specific embodiment of the present invention, the resistance of the pearl that a NPD product is adopted is 0.6～0.9 Ω, and power and the voltage of pearl when operate as normal is about 6～10W and 2.7～4.1V respectively, and its running current is about 2～4A.If use the voltage of 24V to be the power supply of primary winding, the electric current on the then elementary winding is about 0.5～1A.Well known to a person skilled in the art and be, the resistance of pearl can change along with the carrying out of chemical reaction in the testing process, even the pearl of same model, its resistance is also slightly variant with the difference of individuality, therefore above parameter can not be fixed on a certain concrete numerical value, can only obtain the numerical range of determining substantially.
In this specific embodiment, obtain following result by experiment: when being short-circuited fault, the electric current that pearl voltage is lower than 0.5V and primary winding is higher than 0.5A; And when open fault took place, the electric current that pearl voltage is higher than 2V and primary winding was lower than 0.05A.
Therefore, setting voltage threshold value BV_LOW=0.5V, BV_HIGH=2V; And when setting current threshold, the first current threshold BI_LOW is set at the corresponding BI value of electric current of the 0.05A of elementary winding when open fault takes place, the second current threshold BI_HIGH is set at and the corresponding BI value of electric current of the 0.5A of elementary winding when being short-circuited fault.That is, such threshold setting makes the voltage, the current value that record in short circuit and the open fault experiment all fall in the corresponding judgment interval.
According to instruction of the present invention, those skilled in the art can obtain above-mentioned each voltage and current threshold value by known experimental technique to NPD product arbitrarily.And those skilled in the art are appreciated that also the parameter that provides in the above specific embodiment only is an example, and given experimental technique can be applied to the threshold setting in the various NPD products.The present invention is not limited to the above specific embodiment that provides.
As mentioned below, the present invention can realize in many ways.
In one embodiment, the first and second current threshold BI_LOW and BI_HIGH are stored in the firmware or other any storeies of gas chromatograph, during processing in execution graph 4 shown in the step 404 and 406, the value of signal BI is directly compared with the threshold value of being stored.In another embodiment, set up a look-up table in advance by experiment, with the value (its reflection be exactly the current value of primary winding) of signal BI in the storage normal range of operation and the one-to-one relationship between the pearl current value.Simultaneously, set the threshold value of the range of current that is used for definite may be short-circuited fault and open fault in the mode of pearl current value.During processing in execution graph 4 shown in the step 404 and 406, find first and second current threshold BI_LOW and the BI_HIGH according to the pearl current value that sets from look-up table earlier, the value with signal BI compares again.
The automatic open circuit of the embodiment of the invention and short trouble diagnostic method can be carried out in any time in the NPD operational process.In one embodiment, after beginning that pearl 103 applied voltage, just carry out automatic diagnosis method once shown in Figure 4 every predetermined period.When pearl was applied voltage, voltage rose gradually.Therefore, when voltage BV rises gradually since 0, and when being in 0＜BV＜BV_LOW interval, judge whether the fault that is short-circuited; When voltage BV rose to the BV_LOW≤BV that satisfies condition≤BV_HIGH, fault or open fault can not be short-circuited; And when voltage BV further rises to the BV that satisfies condition＞BV_HIGH, judge whether to take place open fault.After voltage BV reaches normal working voltage BV_WORK, no longer carry out fault diagnosis.In another embodiment, even in normal work period, also carry out automatic diagnosis method shown in Figure 4 with predetermined period.
Method for diagnosing faults of the present invention can be carried out separately or combine execution with other processing procedures among the NPD, for example can carry out method for diagnosing faults of the present invention with certain all period interval, and carry out other processing during not carrying out method for diagnosing faults.And the method for diagnosing faults shown in Fig. 4 also not necessarily will be done as a whole the execution, and for example step 403,404 and 405 is pearl open fault diagnostic methods, and step 402,406 and 407 is pearl short trouble diagnostic methods.Those skilled in the art expect variety of way easily, be used for the method for diagnosing faults of the embodiment of the invention is carried out respectively as independent pearl open fault diagnostic method and pearl short trouble diagnostic method, these modes all should be regarded as falling within the true scope of the present invention.
Above in conjunction with Fig. 4, by specific step execution sequence the open circuit and the short trouble automatic diagnosis processing procedure of one embodiment of the invention have been described, but automatic diagnosis method of the present invention is not limited to above-mentioned step execution sequence.For example, after the step 401 of diagnosis beginning, can carry out earlier and judge pearl voltage BV, when obtaining the judged result of negating, carry out again and judge that pearl voltage BV is whether less than the step 402 of threshold value BV_LOW whether greater than the step 403 of threshold value BV_HIGH.The various modifications and variations that those skilled in the art can expect according to the instruction of this instructions all should be regarded as falling within the true scope of the present invention.
Though not shown in Figure 3, the automatic diagnostic device of the embodiment of the invention (promptly carrying out the device of the part of automatic diagnosis processing procedure for example shown in Figure 4 or this automatic diagnosis processing procedure) can be realized with combining of software by various hardware, software and/or hardware.In one embodiment, automatic diagnosis processing procedure of the present invention realizes by working procedure in the master microprocessor on the gas chromatograph mainboard.In another embodiment, be useful on the NPD microprocessor of control NPD subsystem operation on the NPD circuit board, this program of operation realizes automatic diagnosis processing procedure of the present invention in this NPD microprocessor.The operation control program can alleviate the burden of gas chromatograph master microprocessor on the NPD microprocessor.Certainly, the implementation of automatic diagnostic device of the present invention and method is not limited to the foregoing description, and those skilled in the art can expect multiple alternate embodiments according to the instruction of this instructions.
To sum up, embodiments of the invention provide the method and system that a kind of short trouble and open fault that is used for the NPD pearl carries out automatic diagnosis.The technical scheme of the embodiment of the invention has mainly been brought following advantage:
First, what the present invention realized is a kind of automatic diagnostic method, each threshold value that is used to diagnose can be before dispatching from the factory by experiment method pre-determine and store (for example being stored in the middle of the firmware), and can in use carry out fault diagnosis automatically, thereby compare with manual diagnostic mode, saved the cost of aspects such as staff training, instrument outfit;
The second, the mode that current sense resistor and pearl directly are connected in series of the prior art is not adopted in current measurement of the present invention, thereby has avoided the influence to the chemical reaction performance of pearl;
The 3rd, current measurement is carried out in the primary side of transformer, can utilize the characteristic of transformer primary ground connection like this, avoids adopting design complexity, the higher differential amplifier circuit of cost, thereby makes hardware design simpler, easy and cheap.
More than the present invention is described in detail, wherein stated a lot of concrete features, but the present invention is not limited to above-mentioned specific implementations in conjunction with specific embodiment.In each specific embodiment, above-mentioned various concrete features also are not limited to described combination.All should be considered as falling within protection scope of the present invention to the substituting of the specific embodiment of the invention, distortion and improvement and equivalent thereof in any limited range that falls into appended claims.
Claims (15)
1. one kind is used for method that open fault and the short trouble of nitrogen phosphorous detector pearl are diagnosed, and described nitrogen phosphorous detector comprises and is used for by the pearl feed circuit of a transformer to described pearl power supply, and described method is characterised in that:
Be lower than the predetermined current threshold value if the output voltage of described pearl feed circuit is higher than the electric current of predetermined voltage threshold and described primary winding, then diagnose out the pearl open fault has taken place.
2. one kind is used for method that open fault and the short trouble of nitrogen phosphorous detector pearl are diagnosed, and described nitrogen phosphorous detector comprises and is used for by the pearl feed circuit of a transformer to described pearl power supply, and described method is characterised in that:
Be higher than second current threshold if the output voltage of described pearl feed circuit is lower than the electric current of first voltage threshold and described primary winding, then diagnose out the pearl short trouble has taken place.
3. method for diagnosing faults as claimed in claim 2, it is characterized in that: be lower than first current threshold if the output voltage of described pearl feed circuit is higher than the electric current of second voltage threshold and described primary winding, then diagnose out the pearl open fault has taken place, wherein said first voltage threshold is lower than described second voltage threshold, and described first current threshold is lower than described second current threshold.
4. method for diagnosing faults as claimed in claim 3 is characterized in that: described second voltage threshold is lower than the normal working voltage of described pearl.
5. one kind is used for method that the open fault of nitrogen phosphorous detector pearl is diagnosed, and described nitrogen phosphorous detector comprises and is used for said method comprising the steps of by the pearl feed circuit of a transformer to described pearl power supply:
Measure the output voltage of described pearl feed circuit;
Measure the electric current in the described primary winding;
Judge whether described output voltage is higher than predetermined voltage threshold;
If described output voltage is higher than this voltage threshold, judge then whether described electric current is lower than the predetermined current threshold value;
If described electric current is lower than this current threshold, then report open fault.
6. one kind is used for method that the short trouble of nitrogen phosphorous detector pearl is diagnosed, and described nitrogen phosphorous detector comprises and is used for said method comprising the steps of by the pearl feed circuit of a transformer to described pearl power supply:
Measure the output voltage of described pearl feed circuit;
Measure the electric current in the described primary winding;
Judge whether described output voltage is lower than predetermined voltage threshold;
If described output voltage is lower than this voltage threshold, judge then whether described electric current is higher than the predetermined current threshold value;
If described electric current is higher than this current threshold, then report short trouble.
7. one kind is used for method that open fault and the short trouble of nitrogen phosphorous detector pearl are diagnosed, and described nitrogen phosphorous detector comprises and is used for said method comprising the steps of by the pearl feed circuit of a transformer to described pearl power supply:
Measure the output voltage of described pearl feed circuit;
Measure the electric current in the described primary winding;
Judge whether described output voltage is lower than first voltage threshold or is higher than second voltage threshold, and wherein said first voltage threshold is lower than described second voltage threshold;
If described output voltage is higher than described second voltage threshold, judge then whether described electric current is lower than first current threshold;
If described electric current is lower than described first current threshold, then report open fault;
If described output voltage is lower than described first voltage threshold, judge then whether described electric current is higher than second current threshold, described first current threshold is lower than described second current threshold;
If described electric current is higher than described second current threshold, then report short trouble.
8. method for diagnosing faults as claimed in claim 7 is characterized in that: described second voltage threshold is lower than the normal working voltage of described pearl.
9. one kind is used for system that open fault and the short trouble of nitrogen phosphorous detector pearl are diagnosed, described nitrogen phosphorous detector comprises and is used for by the pearl feed circuit of a transformer to described pearl power supply, and described fault diagnosis system is characterised in that and comprises with lower member:
Current detecting unit, the elementary winding of itself and described transformer is coupled, and is used for detecting the electric current of described primary winding;
Amplifying unit is used for the output signal of described current detecting unit is amplified and output; And
Automatic diagnostic device is used for having judged whether to take place according to the output signal of described amplifying unit open fault or the short trouble of pearl.
10. fault diagnosis system as claimed in claim 9, it is characterized in that: described automatic diagnostic device has also judged whether to take place open fault or the short trouble of pearl according to the output voltage of described pearl feed circuit except the output signal according to described amplifying unit.
11. fault diagnosis system as claimed in claim 10 is characterized in that: described current detecting unit and described amplifying unit all are ground connection.
12. fault diagnosis system as claimed in claim 11 is characterized in that described automatic diagnostic device comprises with lower member:
Be used to judge whether the output voltage of described pearl feed circuit is lower than the device of predetermined voltage threshold;
Be used for whether being higher than the device of predetermined current signal threshold value in the judge output signal of described amplifying unit of the situation that described output voltage is lower than described voltage threshold; And
Be used for being higher than the device of report short trouble under the situation of described current signal threshold value in described output signal.
13. fault diagnosis system as claimed in claim 11 is characterized in that described automatic diagnostic device comprises with lower member:
Be used to judge whether the output voltage of described pearl feed circuit is higher than the device of predetermined voltage threshold;
Be used for whether being lower than the device of predetermined current signal threshold value in the judge output signal of described amplifying unit of the situation that described output voltage is higher than described voltage threshold; And
Be used for being lower than the device of report open fault under the situation of described current signal threshold value in described output signal.
14. fault diagnosis system as claimed in claim 11 is characterized in that described automatic diagnostic device comprises with lower member:
Whether the output voltage that is used to judge described pearl feed circuit is lower than first voltage threshold or is higher than the device of second voltage threshold, and wherein said first voltage threshold is lower than described second voltage threshold;
Be used for whether being lower than the device of the first current signal threshold value in the judge output signal of described amplifying unit of the situation that described output voltage is higher than described second voltage threshold;
Be used for being lower than the device of report open fault under the situation of the described first current signal threshold value in described output signal;
Be used for whether being higher than the device of the second current signal threshold value in the situation that described output voltage the is lower than described first voltage threshold described output signal that judges, described first current threshold is lower than described second current threshold; And
Be used for being higher than the device of report short trouble under the situation of the described second current signal threshold value in described output signal.
15. fault diagnosis system as claimed in claim 14 is characterized in that: described second voltage threshold is lower than the normal working voltage of described pearl.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104698330A (en) * | 2013-12-09 | 2015-06-10 | 通用汽车环球科技运作有限责任公司 | Methods and apparatus for diagnosing open faults in an automotive electrical circuit |
| CN109143113A (en) * | 2018-07-24 | 2019-01-04 | 郑州云海信息技术有限公司 | A kind of method, apparatus and system monitoring PCIE outer plug-in card power supply |
| CN110676925A (en) * | 2018-07-02 | 2020-01-10 | 施耐德电气It公司 | AVR bypass relay weld detection |
-
2006
- 2006-08-15 CN CNA2006101112067A patent/CN101126745A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104698330A (en) * | 2013-12-09 | 2015-06-10 | 通用汽车环球科技运作有限责任公司 | Methods and apparatus for diagnosing open faults in an automotive electrical circuit |
| CN104698330B (en) * | 2013-12-09 | 2018-10-02 | 通用汽车环球科技运作有限责任公司 | Method and apparatus for diagnosing the disconnection failure in motor vehicle electric circuit |
| CN110676925A (en) * | 2018-07-02 | 2020-01-10 | 施耐德电气It公司 | AVR bypass relay weld detection |
| CN110676925B (en) * | 2018-07-02 | 2023-06-27 | 施耐德电气It公司 | AVR bypass relay welding detection |
| CN109143113A (en) * | 2018-07-24 | 2019-01-04 | 郑州云海信息技术有限公司 | A kind of method, apparatus and system monitoring PCIE outer plug-in card power supply |
| CN109143113B (en) * | 2018-07-24 | 2021-11-09 | 郑州云海信息技术有限公司 | Method, device and system for monitoring power supply of PCIE external plug-in card |
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