CN101452049A - Circuit failure testing method, apparatus and single board - Google Patents
Circuit failure testing method, apparatus and single board Download PDFInfo
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- CN101452049A CN101452049A CNA2008102202197A CN200810220219A CN101452049A CN 101452049 A CN101452049 A CN 101452049A CN A2008102202197 A CNA2008102202197 A CN A2008102202197A CN 200810220219 A CN200810220219 A CN 200810220219A CN 101452049 A CN101452049 A CN 101452049A
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Abstract
An embodiment of the invention discloses a method for detecting circuit fault, a device and a single board thereof, wherein the method comprises the following steps: detecting whether an input current in a time period is higher than a preset overflowing point; and outputting a warning signal if the input current in the time period is higher than the preset overflowing point. The embodiment actualized with the method according to the invention can increase the accuracy for detecting circuit fault.
Description
Technical field
The present invention relates to electronic technology field, relate in particular to method, device and veneer that a kind of fault detects.
Background technology
In electronic product; power supply is a plurality of equipment/functional module power supply through regular meeting; when fault appears in one of them equipment/functional module; might have influence on the operate as normal of another equipment/functional module; and along with the making rapid progress of electronic product technology, how to guarantee product reliable and stable be the have to problem that must face of each product vendor.
Is that the electrical tilt antenna power supply is an example with the carrier frequency, the internal electric source of carrier frequency is except be its each operational module is powered, also to provide working power for electrical tilt antenna.Because the applications environment of antenna is very abominable, short circuit phenomenon happens occasionally, then in time detect the fault that electrical tilt antenna occurs, the cut-out carrier frequency is that the power supply of electrical tilt antenna is all unaffected to guarantee inner each operational module of carrier frequency, is exactly a very important problem.Usually use a kind of hardware mode to handle to the processing of the outer power supply source of carrier frequency at present: the over-current detection protection; use hardware algorithm; utilize over-current detection circuit that the electric current on the circuit is changed into voltage; deliver to control circuit; if voltage is higher than the hardware design value, then control circuit will cut off carrier frequency electrical tilt antenna will be powered.
The inventor is in implementing process of the present invention, and there are the following problems at least to find prior art:
Existing over-current detection circuit, normal current fluctuation also can be detected as overcurrent, causes false triggering easily.
Summary of the invention
Method, device and carrier frequency device that the embodiment of the invention provides a kind of fault to detect can improve the accuracy that fault detects.
The embodiment of the invention provides a kind of fault detection method, comprising:
Detect whether input current is higher than default mistake flow point in a period of time;
If input current is higher than described default mistake flow point, then outputting alarm signal in described a period of time.
The corresponding embodiment of the invention also provides a kind of circuit fault detecting apparatus, and it comprises:
Alarm module is used for the outputting alarm signal;
Current detection module detects whether input current is higher than default mistake flow point in a period of time, if input current is higher than described default mistake flow point in described a period of time, then by described alarm module outputting alarm signal.
In addition, the embodiment of the invention also provides a kind of veneer, and it comprises:
Circuit fault detecting apparatus is used to detect the veneer fault, and described circuit fault detecting apparatus comprises:
Alarm module is used for the outputting alarm signal;
Current detection module is used to detect whether input current is higher than default mistake flow point in described veneer a period of time, if input current is higher than described default mistake flow point in described veneer a period of time, then by described alarm module outputting alarm signal.
Implement the embodiment of the invention, can improve the accuracy that fault detects, the problem of avoiding flase drop to survey.
Description of drawings
The schematic flow sheet of a kind of fault detection method that Fig. 1 provides for the embodiment of the invention one;
The schematic flow sheet of a kind of fault detection method that Fig. 2 provides for the embodiment of the invention two;
The schematic flow sheet of a kind of fault detection method that Fig. 3 provides for the embodiment of the invention three;
The schematic flow sheet of a kind of fault detection method that Fig. 4 provides for the embodiment of the invention four;
The structural representation of a kind of circuit fault detecting apparatus that Fig. 5 provides for the embodiment of the invention five;
The structural representation of a kind of circuit fault detecting apparatus that Fig. 6 provides for the embodiment of the invention six;
The structural representation of a kind of circuit fault detecting apparatus that Fig. 7 provides for the embodiment of the invention seven;
The structural representation of a kind of veneer that Fig. 8 provides for the embodiment of the invention eight.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention is clearer, several embodiments of the present invention are made further detailed description below in conjunction with accompanying drawing.
Embodiment one
As shown in Figure 1, the schematic flow sheet of a kind of fault detection method that provides for the embodiment of the invention one, it may further comprise the steps:
Step 101: detect whether input current is higher than default mistake flow point in a period of time.
Because faults such as circuit is short-circuited perhaps owing to factor affecting such as last surge, external loading variations, can cause the input current generation overcurrent of circuit.Crossing flow point is the circuit operate as normal, and the receptible maximum input current value of circuit is crossed flow point and generally pre-determined according to the attribute of circuit.
A kind of enforcement scene of this step; input current that can acquisition cuicuit was higher than the mean value of input current in a period of time after the flow point; i.e. average current input in this section period; detect average current input then and whether be higher than default mistake flow point; this section period can be according to the hardware configuration of external circuit and default, for example is 0.1 second, also can be rule of thumb dynamic change; be the protection external circuit, this section period should not be provided with oversize.For the accuracy that guarantees to calculate, before calculating average current, can carry out some necessary processing earlier, some unusual current values are fallen in the place to go, such as extra high current value or low especially current value.Because too high electric current is bigger for the harm of circuit, dimension can make detection method responsive more to surpassing the default bigger weighted value of mistake flow point setting in calculating mean value.
Also can adopt other mode, for example, when input current was higher than flow point, obtain the current value in this a period of time that begins constantly, the statistics current value surpassed the number of flow point, if number reaches a default number of times, for example 5 times or 10 times, can think that interior during this period of time input current is higher than default mistake flow point.
This step can be waited by software execution or programmable logic device (PLD) in realization and carry out.
Step 102: if input current is higher than described default mistake flow point, then outputting alarm signal in described a period of time.
Because factor affecting such as last surge, external loading variations, normal fluctuation can take place in input current, and it might cause input current to carve (being made as first constantly) at a time and be higher than flow point, generally is higher than the electric current of flow point, and its duration is shorter.
The outputting alarm signal, i.e. the abnormality of feedback circuit appearance is convenient to take appropriate measures, for example alarm signal can be input to a gauge tap, when this gauge tap detects this alarm signal, can cut off power supply automatically, to ensure that circuit is not burnt.
In realization, power supply often provides power supply for a plurality of branch roads, the embodiment of the invention can detect each branch road by above-mentioned steps whether fault takes place, if detecting certain branch road generation fault then sends alarm signal, to prevent to influence the operate as normal of other branch roads.
Whether implement present embodiment, can come decision circuitry to break down by the input current that obtains in a period of time, if be the normal fluctuation of electric current, then input current, thereby can prevent the flase drop survey if can not be higher than flow point constantly; On the other hand, ifs circuit breaks down, and for example short circuit then can cause input current to be higher than flow point constantly.Therefore, whether produce as failure judgement, can avoid flase drop to survey, reach the effect that improves detection accuracy by the input current that obtains in a period of time.
Embodiment two
Referring to Fig. 2, the schematic flow sheet of a kind of fault detection method that provides for embodiment among the present invention two, in the present embodiment, when the input current that detects circuit is higher than default mistake flow point, obtain the average current input in a period of time afterwards in this moment, and will detect this average current input and whether be higher than flow point, come decision circuitry whether to break down, specifically comprise:
Step 201: the input current that detects circuit is higher than default mistake flow point;
Because faults such as circuit is short-circuited are perhaps because factor affecting such as last surge, external loading variation can cause the input current of circuit to produce overcurrent.Therefore, can be provided with one earlier and cross flow point, further detect input current and whether be higher than default mistake flow point, wherein, crossing flow point is in order to guarantee the circuit operate as normal, the receptible maximum input current value of this circuit.
This step can seal in input circuit with over-current detection resistance in realization, can cause dividing potential drop on the input current over-current detection resistance, with this dividing potential drop input voltage comparer, compare with the pairing voltage of mistake flow point, whether the dividing potential drop of judging over-current detection resistance was higher than the pairing voltage of flow point, and whether the input current of judging is higher than default mistake flow point.
Step 202: the average current input of acquisition cuicuit in a period of time;
After detecting input current and being higher than set mistake flow point; can not cut off the electricity supply immediately; but the variation of input current in statistics a period of time; the mean value of the input current in obtaining during this period of time, promptly average current input can be the pre-set time during this period of time; such as in 0.1 second after detecting input current and being higher than flow point; also rule of thumb dynamic change, the protection external circuit, this section period should not be provided with oversize.
For example, if cross flow point is 2.3A, when detecting input current and be higher than 2.3A, obtain when input current is higher than 2.3A the average current input in a period of time of 0.1 second, can wait average current input in calculating during this period of time by software or programmable logic device (PLD) in the realization.
Cross flow point value, obtain the length of a period of time of average current input, be that the hardware configuration by circuit is determined, forming according to different circuit has difference.For the holding circuit element is not damaged, a period of time of obtaining average current input should not be provided with oversize.
Step 203: detect above-mentioned average current input and whether be higher than default mistake flow point.
The value of the average current input that step 202 is obtained and default mistake flow point compare, and whether decision circuitry breaks down.
Step 204: if judge in the above-mentioned steps 203 that average current input is higher than default mistake flow point, then outputting alarm signal.
Here, whether be higher than flow point, and can also and cross average current input in the realization and detect again after flow point such as amplifies at processing about detecting average current input.
In realization, power supply often provides power supply for a plurality of branch roads, and the circuit of the embodiment of the invention can be certain branch road wherein, and whether the embodiment of the invention by the power supply branch road that above-mentioned steps detects power supply fault takes place, if detect certain branch road generation fault, then send alarm signal.
Further, when the outputting alarm signal, can cut off the electricity supply to the power supply of this branch road, for example use MOS (Metal-Oxide Semiconductor, metal-oxide semiconductor (MOS)) switch cuts off this branch road power supply power supply automatically, to prevent to influence the operate as normal of other branch roads.
Implement the embodiment of the invention, if the circuit input current was higher than flow point because moment appears in normal fluctuation, the average current input of acquisition cuicuit in this a period of time afterwards constantly, then obviously this average current input can not be higher than flow point, can ignore this influence, prevent the flase drop survey effectively; On the other hand, ifs circuit is carved at a time and is short-circuited, and then can cause input current to be higher than flow point for a long time, and the average current input in a period of time still can be higher than flow point so, then can detect circuit normally and break down.
Embodiment three
As shown in Figure 3, how the schematic flow sheet of a kind of fault detection method that provides for the embodiment of the invention three in the present embodiment, will introduce the average current input of acquisition cuicuit in a period of time, may further comprise the steps:
Step 301: when the input current that detects circuit was higher than flow point, a plurality of time points pairing input current value of acquisition cuicuit in a period of time.
Because the input current of circuit in continuous variation, detects input current at a time in this step and was higher than flow point, for example at t quarter
1Constantly detect input current and be higher than flow point, detect from t
1The mean value of input current in the T time period that constantly begins.Above-mentioned a period of time T is the delay process time that prevents that the survey of electric current flase drop from presetting, and this section period can preset in advance, and such as being 0.1 second, its physical length is set according to circuit structure and the experience in the reality test.
Suppose t
11, t
12... t
1nBe the n of above-mentioned T within the time the moment, this step then is that acquisition cuicuit is at this n the moment pairing input current value: I
1, I
2... I
n, t
1Input current constantly can count this n input current value, also can be not counted in.
Optionally, can be the cycle with the millisecond within the time at above-mentioned T, periodically acquisition cuicuit is in a plurality of input current value of T within the time.
Step 302: above-mentioned a plurality of input current value are averaged, with the average current input of acquisition cuicuit in a period of time;
Connect above-mentioned example, in this step, then to a said n current value I
1, I
2... I
nAverage, obtain the average current input value and be:
In above-mentioned steps, in order to ensure the accuracy of calculating, to a said n current value I
1, I
2... I
nBefore averaging, also some abnormity point of filtering therefrom, the current value of for example too high (being higher than flow point), when not excessive this too high current value is very many, might be that the circuit institute that breaks down really causes that input current was higher than flow point always, these too high current values of not filtering just at this moment.
In addition to a said n current value I
1, I
2... I
nProcessing, also can calculate their weighted mean value, can give higher weighted value, can give lower weighted value for the value that was lower than flow point for the value that surpassed flow point, by calculating mean value again after the weighting, whether be higher than flow point to detect average current input.Can also and cross average current input in the realization and detect again after flow point such as amplifies at processing.
This embodiment averages by obtaining a plurality of input current value, comes the average current input of counting circuit in a period of time after first moment, also can adopt other mode certainly in realization.
In an application scenarios of the embodiment of the invention, carrier frequency in-line power module is the electrical tilt antenna power supply, and the acceptable maximum input current of electrical tilt antenna is 2.3A, and so Yu She mistake flow point can be set to 2.3A, supposes that electrical tilt antenna is at certain t
1Constantly an input current occurring is 2.4A, at t
1Input current constantly returns to again below the 2.3A, by obtaining electrical tilt antenna at t
1A plurality of input current value constantly in 0.1 second are asked average current input, and obviously average current input can be lower than 2.3A, and the input current value of being obtained in this 0.1 second is many more, and its result of calculation is more accurate.
In addition, when electrical tilt antenna at t
1Constantly short circuit taking place, then can cause the input current of electrical tilt antenna to be higher than 2.3A for a long time, asks electrical tilt antenna at t by said method
1Average current input constantly in 0.1 second, this average current input obviously still can be higher than 2.3A, then can send the overcurrent alarm.
Implement the embodiment of the invention, if the input current of circuit was higher than flow point because moment appears in normal fluctuation, then acquisition cuicuit this constantly after average current input in a period of time, then obviously this average current input can not be higher than flow point, can ignore this influence, prevent the flase drop survey effectively; On the other hand, ifs circuit is carved at a time and is short-circuited, then can cause the input current of circuit to be higher than flow point for a long time, circuit average current input in a period of time after this moment still can be higher than flow point so, then can detect circuit normally and break down.
Embodiment four
As shown in Figure 4, the schematic flow sheet of a kind of fault detection method that provides for the embodiment of the invention three.
In the present embodiment, in the step 201-204 that carries out as embodiment two, also further increased following steps:
Step 205: whether the input voltage of testing circuit is lower than default under-voltage point.
Wherein, under-voltage point is the required minimum input voltage value of circuit operate as normal, and this step can be come the input voltage and the under-voltage point of comparator circuit by voltage comparator in realization, whether is lower than default under-voltage point with the input voltage of decision circuitry.If the input voltage of circuit is lower than default under-voltage point, then change step 206 over to, if the input voltage of circuit is not less than default under-voltage point, think that then external circuit is normal.
Step 206: be lower than default under-voltage point if detect the input voltage of circuit, the power supply of then outputting alarm signal, and cut-out circuit, preferred, output undervoltage alarm signal.
Step 205-206 and step 201-204 can be separate on carrying out, and perhaps also can be described as synchronous.
When circuit is short-circuited, might cause supply voltage to be dragged down, and then the input voltage of circuit is dragged down, like this input current of circuit may the time and be higher than flow point, the time and be lower than flow point, also might be lower than flow point always, by the method for above-mentioned detection input current, possibly can't detect breaking down of circuit like this; So in the present embodiment, also increased under-voltage detection, in the input current of testing circuit, also the input voltage of testing circuit when the input voltage that detects circuit is lower than default under-voltage point, will be exported (under-voltage) alarm signal, simultaneously, cut off the power supply of circuit.
For the detection of the input current and the input voltage of circuit, on carrying out, can carry out simultaneously in the present embodiment,, can detect circuit effectively like this and break down when detecting either party unusually with regard to the outputting alarm signal.Whether in general, just can judge and break down because the method for above-mentioned detection electric current need postpone one section, when circuit broke down, under-voltage detection can detect fault faster so.
In realization, power supply often provides power supply for a plurality of branch roads, can detect the input voltage and the input current of power supply branch road simultaneously by above-mentioned steps in the present embodiment, detect the fault of power supply branch road, when detecting the power supply branch road when breaking down, the outputting alarm signal, and further can cut off the electricity supply and be the power supply of this power supply branch road, to prevent to influence other branch road operate as normal.
In an application scenarios of the embodiment of the invention; carrier frequency in-line power module is the electrical tilt antenna power supply; suppose that supply module is 12V; for guaranteeing the operate as normal of electric-tuning antenna device; its input voltage must not be lower than 8V; just under-voltage point can be set to 8V in theory; consider that reliable and stable characteristic then can be set to 9V with under-voltage point; the input voltage that ought detect electrical tilt antenna like this is lower than 9V; be short-circuited such as electrical tilt antenna, cause the input voltage of electrical tilt antenna to be pulled down to below the 9V, will export (under-voltage) alarm signal this moment; and further cut off the power supply of carrier frequency to electrical tilt antenna, with protection carrier frequency internal circuit.
In sum, implement the embodiment of the invention, detect simultaneously by input current and input voltage to circuit, when detecting either party and go wrong, just outputting alarm signal can detect the circuit that electric power system supplies with effectively and break down; In addition, when detecting input current and be higher than default mistake flow point, alarm immediately, but postpone a period of time, add up the average current input of circuit in this section period, just can export (overcurrent) alarm signal, can effectively prevent the flase drop survey when average current input is higher than flow point.
Embodiment five
The structural representation of a kind of circuit fault detecting apparatus that Fig. 5 provides for the embodiment of the invention five, it comprises:
Wherein cross flow point for guaranteeing circuit operate as normal, the receptible maximum input current of circuit.Current detection module 51 can acquisition cuicuit in realization input current be higher than the mean value of input current in a period of time after the flow point, promptly the average current input in this section period detects average current input then and whether is higher than default mistake flow point; Perhaps also can adopt other mode, for example obtain the number of times of the current value appearance that is higher than default mistake flow point that occurs in a period of time,, then should be higher than default mistake flow point by input current in the short time if number of times surpasses a threshold value.
Further, the circuit fault detecting apparatus in the embodiment of the invention can also comprise:
In the realization, control module 53 can be passed through MOS (Metal-Oxide-Semiconductor, metal oxide semiconductor) switch cuts off the power supply of circuit, closes the power supply that the MOS switch cuts off circuit as the output control signal, and the MOS switch is in closed condition by default.
In realization, power supply often provides power supply for a plurality of branch roads, current failure pick-up unit in the present embodiment can be applicable to the to power fault of branch road detection branch, when detecting the power supply branch road when breaking down, the outputting alarm signal, and further can cut off the electricity supply and be the power supply of this power supply branch road, to prevent to influence other branch road operate as normal.
Implement the embodiment of the invention, if the input current of circuit was higher than flow point because moment appears in normal fluctuation, by the average current input of acquisition cuicuit in this a period of time afterwards constantly, then obviously this average current input can not be higher than flow point, can ignore this influence, prevent the flase drop survey effectively; On the other hand, ifs circuit is carved at a time and is short-circuited, then can cause the input current of circuit to be higher than flow point for a long time, the average current input of circuit still can be higher than flow point in a period of time afterwards in this moment so, then can detect circuit normally and break down.
Embodiment six
The structural representation of a kind of circuit fault detecting apparatus that Fig. 6 provides for the embodiment of the invention six.
Circuit fault detecting apparatus in the present embodiment, it has the module with same structure shown in Figure 5 and function, in the present embodiment, will describe current detection module 51 emphatically, and it comprises:
Obtain submodule 511, be used for when input current that detection sub-module 510 detects circuit was higher than flow point by current detection module 51, acquisition cuicuit this constantly after the input current value of a plurality of time points in a period of time;
For example current detection module 51 is at t
1The input current that constantly detects circuit was higher than flow point, obtained 511 of submodules and will obtain from t
1A plurality of input current value in the T time that constantly begins, t
11, t
12... t
1nBe the n of T in the time the moment, obtain submodule 521 at this n the pairing input current value of moment acquisition cuicuit: I
1, I
2... I
n, this n input current value can count t
1Input current constantly also can be not counted in.
Optionally, obtaining submodule 521 can be the cycle with the millisecond in the time at above-mentioned T, and periodically acquisition cuicuit is in a plurality of input current value of T in the time.
Mean value calculation submodule 512 is used for above-mentioned a plurality of input current value additions are averaged, and with the average current input of acquisition cuicuit in a period of time, this module can realize or programmable logic device (PLD) by software in realization.
Connect above-mentioned example, 512 pairs of said n current value I of mean value calculation submodule
1, I
2... I
nAverage, obtain t
1To t
2Average current input value constantly is:
In realization, current detection module 51 can also obtain the average current input of circuit in the above-mentioned T time in other way in addition.
Mean value calculation submodule 512 can wait by software or programmable logic device (PLD) and realize.
In an application scenarios of the embodiment of the invention, carrier frequency in-line power module is the electrical tilt antenna power supply, and the input current of electrical tilt antenna maximum is 2.3A, and so Yu She mistake flow point can be set to 2.3A, supposes that electrical tilt antenna is at certain t
1Constantly an input current occurring is 2.4A, at t
1Input current constantly returns to again below the 2.3A, by obtaining electrical tilt antenna at t
1A plurality of input current value constantly within 0.1 second are asked average current input, and obviously average current input can be lower than 2.3A, then can not send the overcurrent alarm, and the input current value of being obtained in this 0.1 second is many more, and its result of calculation is more accurate.
In addition, when electrical tilt antenna at t
1Constantly short circuit taking place, then can cause the input current of electrical tilt antenna to be higher than 2.3A for a long time, by the above-mentioned electrical tilt antenna of asking at t
1Average current input constantly in 0.1 second, this average current input obviously still can be higher than 2.3A, then can send the overcurrent alarm.
Implement the embodiment of the invention, if the input current of circuit was higher than flow point because moment appears in normal fluctuation, by calculating the average current input in this a period of time afterwards constantly, then obviously this average current input can not be higher than flow point, can ignore this influence, prevent the flase drop survey effectively; On the other hand, ifs circuit is carved at a time and is short-circuited, and then can cause input current to be higher than flow point for a long time, and the average current input of circuit in a period of time still can be higher than flow point so, and then testing circuit breaks down normally.
Embodiment seven
Fig. 7 is the structural representation of a kind of circuit fault detecting apparatus of the embodiment of the invention seven confessions.
Circuit fault detecting apparatus in the present embodiment, it has the module with same structure shown in Figure 6 and function, in addition, also comprises:
Under-voltage detection module 54, whether the input voltage that is used for testing circuit is lower than default under-voltage point, and when the input voltage that detects circuit is lower than at default under-voltage, preferred by alarm module 52 outputting alarm signals, output undervoltage alarm signal.
Wherein, under-voltage point is the required minimum input voltage value of circuit operate as normal, and this module can realize by voltage comparator;
When this moment, control module 53 also was used for alarm module 52 output (under-voltage) alarm signals, cut off the power supply of circuit.
In an application scenarios of the embodiment of the invention, carrier frequency in-line power module is the electrical tilt antenna power supply, suppose that supply module is 12V, for guaranteeing the operate as normal of electric-tuning antenna device, its input voltage must not be lower than 8V, just under-voltage point can be set to 8V in theory, consider that reliable and stable characteristic then can be set to 9V with under-voltage point, the input voltage that detects electrical tilt antenna when under-voltage detection module 54 is lower than 9V like this, be short-circuited such as electrical tilt antenna, cause the input voltage of electrical tilt antenna to be pulled down to below the 9V, this moment, alarm module 52 will be exported (under-voltage) alarm signal, preferably, control module is cut off the power supply of carrier frequency to electrical tilt antenna.
In sum, implement the embodiment of the invention, when the input current that detects circuit at current detection module is higher than default mistake flow point, not alarm immediately, but postpone a period of time, obtain the average current input of this section in the time by current detection module, when average current input was higher than flow point, just can effectively prevent the flase drop survey by alarm module output (overcurrent) alarm signal; In addition, by current detection module and under-voltage detection module, the input current and the input voltage of circuit detected simultaneously, when detecting either party and go wrong, just by alarm module outputting alarm signal, can detect the circuit that electric power system supplies with effectively and break down.
Embodiment eight
As shown in Figure 8, a kind of veneer that also provides for the embodiment of the invention eight.
Wherein power supply 80 is veneer 81 power supplies, circuit fault detecting apparatus 811 is by detecting the input current (and input voltage) of 80 pairs of veneers 81 of power supply, detect veneer 81 whether fault takes place, fault takes place when detecting veneer 81, outputting alarm signal then, preferably, also can the cut off the electricity supply power supply of 80 pairs of veneers 81.
Implement the embodiment of the invention,, can in time detect veneer and break down, effectively prevent the flase drop survey simultaneously by circuit fault detecting apparatus.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in the foregoing description method, be to instruct relevant hardware to finish by computer program, described program can be stored in the computer read/write memory medium, this program can comprise the flow process as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only storage memory body (Read-Only Memory, ROM) or at random store memory body (Random Access Memory, RAM) etc.
The above is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also are considered as protection scope of the present invention.
Claims (10)
1, a kind of fault detection method is characterized in that, comprising:
Detect whether input current is higher than default mistake flow point in a period of time;
If input current is higher than described default mistake flow point, then outputting alarm signal in described a period of time.
2, fault detection method as claimed in claim 1 is characterized in that, whether input current is higher than default mistake flow point in described detection a period of time, comprising:
Be higher than described default mistake flow point if detect input current, then obtain the pairing input current value of a plurality of time points in a period of time that a described time point begins at a time point;
If the mean value of the pairing input current value of described a plurality of time points is higher than described default mistake flow point, input current is higher than described default mistake flow point in then described a period of time.
3, fault detection method as claimed in claim 2 is characterized in that, also comprises:
Detect input voltage and whether be lower than default under-voltage point;
If described input voltage is lower than default under-voltage point, then outputting alarm signal.
4, as any described fault detection method of claim 1-3, it is characterized in that, if the outputting alarm signal then cuts off power supply.
5, a kind of circuit fault detecting apparatus is characterized in that, comprising:
Alarm module is used for the outputting alarm signal;
Current detection module detects whether input current is higher than default mistake flow point in a period of time, if input current is higher than described default mistake flow point in described a period of time, then by described alarm module outputting alarm signal.
6, circuit fault detecting apparatus as claimed in claim 5 is characterized in that, described current detection module comprises:
Detection sub-module is obtained submodule, the mean value calculation submodule;
Described detection sub-module, be used to detect input current and whether be higher than default mistake flow point or be used to detect the mean value that the mean value calculation submodule calculates whether be higher than described default mistake flow point, if described mean value is higher than described default mistake flow point, then by described alarm module outputting alarm signal;
The described submodule that obtains, be used for when described detection sub-module when a time point detects input current and is higher than described default mistake flow point, obtain the input current value of a plurality of time points in a period of time that a described time point begins;
Described mean value calculation submodule is used for obtaining a plurality of input current value additions that submodule obtains and averaging described, to obtain the mean value of the input current in described a period of time;
7, circuit fault detecting apparatus as claimed in claim 6 is characterized in that, also comprises:
Under-voltage detection module is used to detect input voltage and whether is lower than default under-voltage point, is lower than default under-voltage point if detect described input voltage, then by described alarm module outputting alarm signal.
8, as any described circuit fault detecting apparatus of claim 5-7, it is characterized in that, also comprise:
Control module is used for cutting off power supply when described alarm module outputting alarm signal.
9, a kind of veneer is characterized in that, comprising:
Circuit fault detecting apparatus is used to detect the veneer fault, and described circuit fault detecting apparatus comprises:
Alarm module is used for the outputting alarm signal;
Current detection module is used to detect whether input current is higher than default mistake flow point in described veneer a period of time, if input current is higher than described default mistake flow point in described veneer a period of time, then by described alarm module outputting alarm signal.
10, veneer as claimed in claim 9 is characterized in that, described circuit fault detecting apparatus also comprises:
Under-voltage detection module, whether the input voltage that is used to detect described veneer is lower than default under-voltage point, is lower than default under-voltage point if detect the input voltage of described veneer, by described alarm module outputting alarm signal.
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| CNA2008102202197A CN101452049A (en) | 2008-12-22 | 2008-12-22 | Circuit failure testing method, apparatus and single board |
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| CNA2008102202197A CN101452049A (en) | 2008-12-22 | 2008-12-22 | Circuit failure testing method, apparatus and single board |
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