CN103941136A - Signal sampling circuit resistor-capacitor component short circuit and open circuit fault diagnosis method - Google Patents
Signal sampling circuit resistor-capacitor component short circuit and open circuit fault diagnosis method Download PDFInfo
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- CN103941136A CN103941136A CN201310712851.4A CN201310712851A CN103941136A CN 103941136 A CN103941136 A CN 103941136A CN 201310712851 A CN201310712851 A CN 201310712851A CN 103941136 A CN103941136 A CN 103941136A
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Abstract
The invention discloses a signal sampling circuit resistor-capacitor component short circuit and open circuit fault diagnosis method. A DC transfer function of signal input end voltage and circuit output end voltage in the normal state of a circuit is established by the method; the short circuit and open circuit states of each component in the circuit are simulated so that DC transfer function equations of the circuit input end voltage and the circuit output end voltage under the states are obtained; concrete parameter values of each component are put into the corresponding DC transfer function equations so that a circuit fault diagnosis table is established; the signal input end voltage and the circuit output end voltage of the circuit are practically measured, and the corresponding possible fault point is searched according to the diagnosis table; and the component parameter value of the possible fault point is measured by adopting a node resistance mode, based on which short circuit or open circuit of the component of the possible fault point is judged and finally the fault point of the circuit is confirmed. Defects of conventional fault diagnosis are overcome, and the fault point of the circuit is rapidly and effectively diagnosed so that maintenance efficiency of electrical equipment is enhanced, and normal operation of the electrical equipment is guaranteed.
Description
Technical field
The present invention relates to the diagnostic method of the short circuit of a kind of signal sample circuit Resistor-Capacitor Unit and open fault.
Background technology
Along with the application and development of electronic technology; all kinds of electric-control systems are increasingly sophisticated; conventionally can comprise signal sample circuit, I/O control circuit, arithmetic processing circuit etc.; in the production run of product; due to the existence of technique/detection risk; generally all concentrate on signal sample circuit and I/O control circuit than the circuit that is easier to break down; all to adopt the method for searching for by following the clues for the traditional diagnostic method of fault; one-level one-level is reviewed; until find fault generation part, and then carry out last fault by the variation of components and parts voltage/resistance and determine.This does not have much problems for ball bearing made using, but for complicated circuit, will run into larger trouble.Circuit is more complicated, and the node of circuit is more, and the loop of combined crosswise/impact is just more, and a large amount of accumulations of information, can easily cause misjudgment or walk some detours, and even destructive malfunction phenomenon causes the follow-up corrective action of product to be difficult to carry out and puts in place.
As shown in Figure 1, temperature signal sample circuit is formed thermometric bridge and is applied power supply Vdc by resistance R 1, resistance R 2, resistance R 3 and resistance R 4, wherein resistance R 2 is temperature detecting resistance, brachium pontis two ends are connected respectively the positive-negative input end of comparison amplifier with resistance R 6 by resistance R 5, comparison amplifier output temperature signal, comparison amplifier positive input terminal is by resistance R 7 and capacitor C 2 ground connection, contact resistance R8 and capacitor C 1 between comparison amplifier negative input end and output terminal; Resistance R 2 variation with temperature resistances change, thereby the dividing potential drop at resistance R 2 two ends also changes, and becomes the input voltage vin of comparison amplifier positive input terminal, after comparison amplifier is processed, and output temperature signal.For this sample circuit, once find that temperature signal is incorrect, first measure comparison amplifier output end voltage Vout, contrast with normal voltage, if undesired, then measure comparison amplifier negative input end voltage, contrast with normal voltage, if undesired, measure again comparison amplifier positive input terminal voltage, if undesired, more whether measure voltage in Vin voltage and resistance R 4 normal, so one-level one-level is relatively reviewed down, finally finds trouble spot.Obviously so fault diagnosis wastes time and energy, and has reduced the overhaul efficiency of electrical equipment, affects the normal operation of electrical equipment.
Summary of the invention
Technical matters to be solved by this invention is to provide the diagnostic method of the short circuit of a kind of signal sample circuit Resistor-Capacitor Unit and open fault, this method has overcome the defect of traditional fault diagnosis, the trouble spot of Resistor-Capacitor Unit short circuit and open circuit in efficient diagnosis circuit fast, improve electrical equipment overhaul efficiency, ensured the normal operation of electrical equipment.
For solving the problems of the technologies described above, the diagnostic method of signal sample circuit Resistor-Capacitor Unit of the present invention short circuit and open fault comprises the steps:
Step 1, the direct current transport function of signal input part voltage and circuit output end voltage while setting up normal condition according to circuit;
Step 2, the voltage direct current transport function of setting up during according to circuit normal condition, in mimic channel, each Resistor-Capacitor Unit is at short circuit and open-circuit condition, obtains circuit input end voltage under this Resistor-Capacitor Unit short circuit and open-circuit condition and the direct current transport function equation of circuit output end voltage;
Step 3, the design parameter value of each Resistor-Capacitor Unit in circuit is updated in the direct current transport function equation of corresponding circuit input end voltage and circuit output end voltage, sets up the diagnostics table of each Resistor-Capacitor Unit short circuit and open fault in circuit;
The signal input part voltage of step 4, actual measurement circuit and circuit output end voltage, search corresponding possible breakdown point according to diagnostics table;
Step 5, employing node-resistance method are measured the Resistor-Capacitor Unit parameter value of possible breakdown point, and the Resistor-Capacitor Unit that judges accordingly possible breakdown point is short circuit or open circuit, finally determines the trouble spot of circuit.
Because the diagnostic method of signal sample circuit Resistor-Capacitor Unit of the present invention short circuit and open fault has adopted technique scheme, i.e. signal input part voltage when this method model circuit normal condition and the direct current transport function of circuit output end voltage; In mimic channel, each element is at short circuit and open-circuit condition, obtains circuit input end voltage under this Resistor-Capacitor Unit short circuit and open-circuit condition and the direct current transport function equation of circuit output end voltage; Each Resistor-Capacitor Unit design parameter value is updated in corresponding direct current transport function equation, sets up the diagnostics table of each Resistor-Capacitor Unit short circuit and open fault in circuit; The signal input part voltage of actual measurement circuit and circuit output end voltage, search corresponding possible breakdown point according to diagnostics table; Adopt node-resistance method to measure the Resistor-Capacitor Unit parameter value of possible breakdown point, the Resistor-Capacitor Unit that judges accordingly possible breakdown point is short circuit or open circuit, finally determines the trouble spot of circuit.This method has overcome the defect of traditional fault diagnosis, and Resistor-Capacitor Unit short circuit and open fault point in efficient diagnosis circuit, improved electrical equipment overhaul efficiency fast, ensures the normal operation of electrical equipment.
Brief description of the drawings
Below in conjunction with drawings and embodiments, the present invention is described in further detail:
Fig. 1 is temperature signal sample circuit schematic diagram.
Embodiment
The diagnostic method of signal sample circuit Resistor-Capacitor Unit of the present invention short circuit and open fault comprises the steps:
Step 1, the direct current transport function of signal input part voltage and circuit output end voltage while setting up normal condition according to circuit;
Step 2, the voltage direct current transport function of setting up during according to circuit normal condition, in mimic channel, each Resistor-Capacitor Unit is at short circuit and open-circuit condition, obtains circuit input end voltage under this Resistor-Capacitor Unit short circuit and open-circuit condition and the direct current transport function equation of circuit output end voltage;
Step 3, the design parameter value of each Resistor-Capacitor Unit in circuit is updated in the direct current transport function equation of corresponding circuit input end voltage and circuit output end voltage, sets up the diagnostics table of each Resistor-Capacitor Unit short circuit and open fault in circuit;
The signal input part voltage of step 4, actual measurement circuit and circuit output end voltage, search corresponding possible breakdown point according to diagnostics table;
Step 5, employing node-resistance method are measured the device parameter values of possible breakdown point, and the Resistor-Capacitor Unit that judges accordingly possible breakdown point is short circuit or open circuit, finally determines the trouble spot of circuit.
For the temperature signal sample circuit shown in Fig. 1, the signal input part voltage of this circuit normal condition and the direct current transport function of circuit output end voltage are:
=
When circuit Resistor-Capacitor Unit is short-circuited or when open fault, its direct current transport function relation also will change, and be specially:
1,, in the time of resistance R 1 short circuit, direct current transport function equation is:
=
In the time that resistance R 1 is opened a way, direct current transport function equation is:
=
2,, in the time of resistance R 2 short circuit, direct current transport function equation is:
=
In the time that resistance R 2 is opened a way, direct current transport function equation is:
=
3,, in the time of resistance R 3 short circuit, direct current transport function equation is:
=
In the time that resistance R 3 is opened a way, direct current transport function equation is:
=
4,, in the time of resistance R 4 short circuit, direct current transport function equation is:
=
In the time that resistance R 4 is opened a way, direct current transport function equation is:
=
5,, in the time of resistance R 5 short circuit, direct current transport function equation is:
=1+
In the time that resistance R 5 is opened a way, direct current transport function equation is:
=
6, in the time of resistance R 6 short circuit, now circuit is relatively exported,
>
, output voltage V out=0, on the contrary comparison amplifier output saturation voltage, is generally the supply voltage a little less than comparison amplifier,
In the time that resistance R 6 is opened a way, now circuit is exactly a follower,
=
7,, in the time of resistance R 7 short circuit, direct current transport function equation is:
=
In the time that resistance R 7 is opened a way, direct current transport function equation is:
=1+
8,, in the time of resistance R 8 short circuit, direct current transport function equation is:
=
In the time that resistance R 8 is opened a way, now circuit is relatively exported,
>
, output voltage V out=0, on the contrary comparison amplifier output saturation voltage, is generally the supply voltage a little less than comparison amplifier,
9, in the time of capacitor C 1 short circuit, be equal to resistance R 8 short circuits,
In the time that capacitor C 1 is opened a way, on output voltage without impact,
10, in the time of capacitor C 2 short circuit, be equal to resistance R 7 short circuits,
In the time that capacitor C 2 is opened a way, on output voltage without impact.
In the sample circuit of temperature signal shown in Fig. 1, the design parameter value of each Resistor-Capacitor Unit is respectively: R1=820 Ω, R2=1K, R3=1K, R4=1K, R5=130K, R6=130K, R7=390K, R8=390K, C1=10n, C2=10n, by in the above-mentioned each direct current transport function equation of design parameter value difference substitution of each Resistor-Capacitor Unit, the fault diagnosis table that obtains circuit is as follows:
| Element | Direct current transitive relation when Resistor-Capacitor Unit open circuit | Vin | Direct current transitive relation when Resistor-Capacitor Unit short circuit | Vin |
| R1 | -∞ | 0 | 1.5 | Vdc |
| R2 | 1.5 | Vdc | -∞ | 0 |
| R3 | 3 | 0.55Vdc | -2.46 | 0.55Vdc |
| R4 | -2.46 | 0.55Vdc | 3 | 0.55Vdc |
| R5 | 0 | 0.55Vdc | 1.27 | 0.55Vdc |
| R6 | 0.75 | 0.55Vdc | 0 | 0.55Vdc |
| R7 | 1.27 | 0.55Vdc | -2.73 | 0.55Vdc |
| R8 | -∞ | 0.55Vdc | 0.75 | 0.55Vdc |
| C1 | / | 0.55Vdc | 0.75 | 0.55Vdc |
| C2 | / | 0.55Vdc | -2.73 | 0.55Vdc |
From diagnostics table, can find out, phenomenon of the failure may lose efficacy by corresponding multiple Resistor-Capacitor Unit, now just need to screen, discriminate method for distinguishing and mainly adopt node-resistance method, can be for the Resistor-Capacitor Unit object of judgement because had, therefore can conveniently find out specifically the lost efficacy fault that causes of some Resistor-Capacitor Units.
When this method is diagnosed in reality, temperature signal sample circuit as shown in for Fig. 1, measures respectively Vout and Vin voltage, then ratio calculated, according to this ratio and Vin, in the fault diagnosis table of setting up, find this ratio and element corresponding to Vin again, if this ratio is 1.27, Vin=0.55Vdc, the possible breakdown of corresponding resistance R 5 or resistance R 7, then measuring resistance R5 or resistance R 7 resistances, to judge that short circuit still opens a way, make rapid failure diagnosis with this.
As this temperature signal sample circuit is applied to motor temperature sampling, its phenomenon of the failure is that output voltage does not change with input signal; Adopt this method to diagnose, find that through measuring its signal input part voltage and circuit output end voltage transitive relation are always 0, applied signal voltage Vin is 0, and output voltage V out is 0; Through looking up the fault diagnostics table, known its corresponding resistance R 1 is opened a way or the situation of resistance R 2 short circuits, then adopt node-resistance method to detect respectively the short-circuit conditions of opening of resistance R 1 and resistance R 2, determine it is because resistance R 2 short circuits cause fault, finally diagnose out rapidly even tin welding to cause this situation of resistance R 2 short circuits, thereby got rid of fast fault.
Claims (1)
1. a diagnostic method for the short circuit of signal sample circuit Resistor-Capacitor Unit and open fault, is characterized in that this method comprises the steps:
Step 1, the direct current transport function of signal input part voltage and circuit output end voltage while setting up normal condition according to circuit;
Step 2, the voltage direct current transport function of setting up during according to circuit normal condition, in mimic channel, each Resistor-Capacitor Unit is at short circuit and open-circuit condition, obtains circuit input end voltage under this Resistor-Capacitor Unit short circuit and open-circuit condition and the direct current transport function equation of circuit output end voltage;
Step 3, the design parameter value of each Resistor-Capacitor Unit in circuit is updated in the direct current transport function equation of corresponding circuit input end voltage and circuit output end voltage, sets up the diagnostics table of each Resistor-Capacitor Unit short circuit and open fault in circuit;
The signal input part voltage of step 4, actual measurement circuit and circuit output end voltage, search corresponding possible breakdown point according to diagnostics table;
Step 5, employing node-resistance method are measured the Resistor-Capacitor Unit parameter value of possible breakdown point, and the Resistor-Capacitor Unit that judges accordingly possible breakdown point is short circuit or open circuit, finally determines the trouble spot of circuit.
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Cited By (4)
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| CN105158679A (en) * | 2015-09-14 | 2015-12-16 | 电子科技大学 | Filter circuit fault diagnosis method based on transmission function |
| CN107817413A (en) * | 2017-10-25 | 2018-03-20 | 国网福建省电力有限公司 | The method of unshorting Resistance Influence in the experiment of transformer low-voltage short-circuit impedance |
| CN112362193A (en) * | 2020-10-13 | 2021-02-12 | 华帝股份有限公司 | Open circuit detection method of NTC temperature sensor |
| CN114325222A (en) * | 2021-12-09 | 2022-04-12 | 山西三友和智慧信息技术股份有限公司 | Electronic device failure monitoring protection control system |
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| CN105158679A (en) * | 2015-09-14 | 2015-12-16 | 电子科技大学 | Filter circuit fault diagnosis method based on transmission function |
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| CN114325222A (en) * | 2021-12-09 | 2022-04-12 | 山西三友和智慧信息技术股份有限公司 | Electronic device failure monitoring protection control system |
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