CN101005202A - Method and system for detecting DC over current protector - Google Patents
Method and system for detecting DC over current protector Download PDFInfo
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- CN101005202A CN101005202A CN 200610170565 CN200610170565A CN101005202A CN 101005202 A CN101005202 A CN 101005202A CN 200610170565 CN200610170565 CN 200610170565 CN 200610170565 A CN200610170565 A CN 200610170565A CN 101005202 A CN101005202 A CN 101005202A
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Abstract
The disclosed system includes detection interface, amplifying circuit, and signal discrimination unit. Detecting electric parameters at two ends of DC overcurrent protector, magnifying the electric parameters, and using the magnified electric parameters to determine whether DC overcurrent protector is abnormal; if yes, the system outputs alarming information. When detection cable is not connected, the system still can report abnormal state of fuse wire. Features are: not influenced by small current, not influenced by voltage difference between voltage of backup power source and system voltage, compatible to detect state of air switch and regular switching value.
Description
Technical field
The present invention relates to electronic technology field, relate in particular to a kind of detection method and system that is used for the overcurrent protector of DC circuit.
Background technology
In electronic equipment, use under the situation of DC power supply as power supply,, need output, input serial connection DC over current protector to come overcurrent protection is carried out in the output of DC power supply to the DC power supply of power electronic equipment for safe in utilization.At present, generally adopt air switch, magnetic circuit breaker, fuse etc. as DC over current protector.Surpass design current when very big (as greater than a certain predetermined threshold value) at certain road electric current, this DC over current protector can this road circuit of automatic disconnection, to reach the purpose of protection electrical network, DC power system.Inserting DC over current protector can make whole electric equipment or whole system can not influence the normal operation of whole electric equipment or whole system because of part electrical network, equipment short circuit power down.
In various DC over current protector, described air switch and magnetic circuit breaker operation principle are similar, and overcurrent can external force close after disconnecting once more.In addition, for other various overcurrent switches, promptly the Switch overflowing device usually all can not be from recovering connection.Described fuse can be divided into disposable expendable fuse and can recover fuse, wherein, can recover fuse and can a period of time recovery connect behind overcurrent.
Therefore; described DC over current protector is rapid wear or the easy circuit protection unit that switches of state; like this; just need a kind of DC over current protector testing mechanism can detect, report the operating state of DC over current protector to give the Local or Remote user in real time, with convenient administering and maintaining to protected electronic equipment.
Is example with fuse as DC over current protector, the electric power system fuse mounting structure of corresponding electric equipment as shown in Figure 1, this electric power system mainly comprises: DC power supply group, backup DC power supply group, storage battery and at least one load (being electronic equipment); As shown in fig. 1, described fuse is installed on the cathode power supply cable usually, and concrete installation site also can specifically be set according to electric power system structure difference.
DC over current protector testing mechanism at the fuse that is provided with in the above-mentioned electric power system specifically can adopt implementation shown in Figure 2.
In Fig. 2, realize that the testing circuit of DC over current protector testing mechanism comprises an optocoupler, two bar state detection streamers are connected to the fuse two ends.Because fuse resistor is very little, electric current is without optocoupler when operate as normal; Behind fuse failure, electric current is owing to pressure reduction process optocoupler, and the optocoupler conducting produces the fuse abnormality alarming.
The shortcoming that this DC over current protector testing mechanism shown in Figure 2 exists is as follows:
On if the state-detection cable at 1 fuse two ends does not connect; perhaps malunion is true, and then no current is through optocoupler, optocoupler will be always can't conducting; the state that then will judge fuse obviously can not detect the virtual condition of DC over current protector (being fuse) truly always for normal.
2, since the photoelectricity transmission of optocoupler than being unsettled and decay property being arranged, therefore, even fuse disconnects, because optocoupler is place in circuit, still having a few mA electric currents in the load flows through, this little electric current will bring the driving that should not take place to load probably, thereby influence the use of load and at the detection of load etc.
3, if described fuse is installed in the loop of backup DC power supply group, storage battery; because of the potential difference of the voltage of back-up source and system voltage very little (usually can below 1V); when fuse disconnects; described potential difference can't surpass the conducting voltage of optocoupler; be that optocoupler can not conducting, make the problem that can't in time detect appearance.
DC over current protector testing mechanism at the fuse that is provided with in the above-mentioned electric power system specifically can also adopt implementation shown in Figure 3.
In Fig. 3; described fuse is located on the power cable of power supply; the testing circuit of realizing the DC over current protector testing mechanism mainly comprises triode; the base stage of triode is connected the two bar state detection streamers of drawing and is connected on the power cable at fuse two ends with collector electrode, the emitter of triode then is connected on another power cable of electric power system by another bar state detection streamer.Described fuse just often, triode can conducting, the A point voltage is a low-voltage; When described fuse disconnected, triode can not conducting, and the A point voltage is a high voltage just; Testing circuit is by detecting the A point voltage, just can know whether operate as normal of fuse, disconnects if detect fuse, then can export corresponding warning, to realize relevant detection mechanism.
The shortcoming that this overcurrent protector testing mechanism shown in Figure 3 exists is as follows:
If described fuse is installed in the loop of backup battery group, storage battery, even then fuse disconnects, if the voltage of back-up source surpasses the conducting voltage of triode, this circuit is just thought the fuse operate as normal; And the voltage of back-up source group is certain to surpass the conducting voltage of triode usually, and therefore, this overcurrent protector testing mechanism can't detect the operating state of the fuse of back-up source group setting at all.
Summary of the invention
Embodiments of the invention provide a kind of DC over current protector detection method and system, thereby can report the testing result at the operating state of DC over current protector accurately, reliably.
Embodiments of the invention provide a kind of DC over current protector detection method, comprising:
Detect the electric parameter at DC over current protector two ends; After described electric parameter carried out processing and amplifying, the electric parameter of crossing according to processing and amplifying was differentiated whether operation irregularity of DC over current protector, and when operation irregularity output alarm information.
Embodiments of the invention provide a kind of DC over current protector detection system, comprise detecting interface, differential amplifier circuit and signal judgement unit, wherein:
Detect interface, connect overcurrent protector and differential amplifier circuit, described differential amplifier circuit is by detecting the electric parameter that interface detects the DC over current protector two ends;
Amplifying circuit, input connects the DC over current protector two ends by detecting interface, output termination signal judgement unit the electric parameter at detected DC over current protector two ends is carried out processing and amplifying, and the working signal that will handle is sent to the signal judgement unit;
Signal judgement unit, the working signal that is used for the processing of sending according to differential amplifier circuit are differentiated whether operation irregularity of DC over current protector, and when operation irregularity output alarm information.
The embodiment that is provided by the invention described above as can be seen; respective embodiments can detect small voltage (mV even the μ V level) difference at DC over current protector two ends; utilize the voltage difference at DC over current protector two ends; carrying out suitable multiple through amplifier U1 amplifies; discriminating processing then; detect the DC over current protector state, thereby improved the accuracy of testing result.
Description of drawings
Fig. 1 is the electric power system DC over current protector scheme of installation of general electric equipment;
Fig. 2 is the testing circuit schematic diagram of existing technology one described DC over current protector state-detection;
Fig. 3 is the testing circuit schematic diagram of existing technology two described DC over current protector state-detection;
Fig. 4 is the specific implementation structural representation block diagram one of system embodiment of the present invention;
Fig. 5 is the specific implementation structural representation block diagram two of system embodiment of the present invention;
Fig. 6 is the specific implementation electrical block diagram of system embodiment of the present invention.
Embodiment
Among the embodiment of a kind of DC over current protector detection method of the present invention, it mainly is the electric parameter that detects the DC over current protector two ends; And described electric parameter carried out processing and amplifying, and differentiate whether operation irregularity of DC over current protector according to the electric parameter that processing and amplifying is crossed, and when operation irregularity output alarm information.For present embodiment is the voltage difference that detects the DC over current protector two ends; and described voltage difference carried out the difference processing and amplifying; and the voltage difference of crossing according to the difference processing and amplifying differentiates whether operation irregularity of DC over current protector, and when operation irregularity output alarm information.
The specific implementation structure of a kind of DC over current protector detection system embodiment of the present invention can be as Fig. 4, Fig. 5 and shown in Figure 6; comprise and detect interface, amplifying circuit and signal judgement unit; be connected with detected DC over current protector to gather the electric parameter value (normally magnitude of voltage) at DC over current protector two ends by described detection interface; and detect discriminating processing after the amplifying circuit processing and amplifying, offering the signal judgement unit, to determine the operating state (promptly whether disconnecting) of described detected DC over current protector.Wherein, the DC over current protector that can utilize the present invention to detect includes but not limited to be fuse, air switch or magnetic circuit breaker; more specifically say; corresponding DC over current protector is generally when playing overcurrent protection can disconnect current supply circuit, and DC over current protector spare that can't automatic recovery of power supply.
Amplifying circuit recited above can adopt differential amplifier circuit concerning present embodiment; differential amplifier circuit is to the voltage difference at the DC over current protector two ends of detection interface collection; carry out offering the signal judgement unit after the difference processing and amplifying and detect discriminating processing, to determine the operating state (promptly whether disconnecting) of described detected DC over current protector.
Among the embodiment provided by the invention; described detection interface is connected between DC over current protector and the differential amplifier circuit; the differential amplifier circuit input connects the DC over current protector two ends by detecting interface; so that gather the two ends power parameter that obtains detected DC over current protector; differential amplifier circuit is used for the working signal at detected DC over current protector two ends (normally magnitude of voltage) is carried out the difference processing and amplifying; and the working signal that will handle is sent to the signal judgement unit, thereby so that by the signal judgement unit power parameter that collects carried out the operating state that judgment processing is determined DC over current protector.
As shown in Figure 6; described detection interface comprises that connecting DC over current protector specifically can be connected with the differential amplifier circuit input with J2 by cable and connector J1; because detecting the effect of interface is to obtain signal; so power is very little; do not do requirement to the cross-section of cable is long-pending, but cable twisted-pair feeder the most convenient for walking.And the purpose that adopts connector J1 and J2 to be circuit in the process easy to use be connected; certainly as for the purpose of saving cost also can not adopt connector J1 and J2, and directly adopt cable that the DC over current protector two ends are connected with the differential amplifier circuit input.
Still referring to Fig. 6, described differential amplifier circuit comprises amplifier U1, the 3rd resistance R 3, the 5th resistance R 5, the 6th resistance R 6 and the 7th resistance R 7, the electrode input end of amplifier U1 is connected in an end of DC over current protector by the 5th resistance R 5, the negative input of amplifier U1 is connected in the other end of DC over current protector by the 6th resistance R 6, to gather the power parameter (normally magnitude of voltage) at DC over current protector two ends; The electrode input end of amplifier U1 also connects the reference voltage contact by the 3rd resistance R 3, and the negative input of amplifier is connected to the output of amplifier by the 7th resistance R 7.
The operating voltage of described amplifier U1 is anodal operating voltage terminal voltage V1 and negative pole operating voltage terminal voltage V2, the value of voltage V1, voltage V2 is about the equivalent voltage V0 symmetry on the detected fuse, V1-V0=V0-V2 just, voltage V0 considers usually in actual applications be with detected fuse on the equipotential magnitude of voltage of voltage.Voltage V0, V1, V2 such as above-mentioned mode value purpose are the input signal (magnitudes of voltage at normally detected fuse two ends in order to guarantee amplifier U1; should approach V0) between the operating voltage V1 and V2 of amplifier U1; because the voltage of DC over current protector both sides may be higher or lower than the voltage of V0; and the input voltage of operational amplifier can not much larger than, less than its operating voltage range; therefore; need to set voltage V1 and voltage V2 about voltage V0 symmetry, that is to say needs negative voltage V2.
Described reference voltage provides circuit by reference voltage, reference voltage provides circuit to comprise that first resistance R 1 and second resistance R, 2, the first resistance R 1 and second resistance R 2 are serially connected with the equipotential end (voltage is V0) of DC over current protector and the anodal operating voltage end (voltage is V1) of amplifier U1; First resistance R 1 is the reference voltage contact with the contact of connecting of second resistance R 2, and the reference voltage contact connects the electrode input end of amplifier U1 by the 3rd resistance R 3.The voltage of reference voltage contact should be between V0 and V1.Because the pressure reduction directivity of DC over current protector both sides is inconsistent,, can make the output judgment signal of U1 be higher than V0 so the reference voltage of amplifier U1 will be got the median that is higher than V0 to V1.Being convenient to subsequent conditioning circuit handles.
In addition, for guard amplifier U1, described differential amplifier circuit also comprises two groups of protection circuits, is connected to two inputs that amplify the U1 device respectively, be used for guard amplifier U1, prevent to damage when externally input signal surpasses amplifier U1 work common-mode voltage amplifier; Described protection circuit specifically can comprise two order diode in series D1 and D2, the anodal termination amplifier U1 negative pole operating voltage end in series connection back, the anodal operating voltage end of negative pole termination amplifier U1; The series connection contact connects the input of amplifier U1.D1, D2 are the guard sections of U1, the work common-mode voltage that surpasses U1 as external input signal, then D1, D2 will protective action protect U1, when the input detection signal is higher than V1 and adds the conducting voltage of diode, D1, D2 have big electric current to flow through R5, R6 with regard to conducting, and input voltage is by after resistance R 5, the R6 step-down like this, voltage is with regard to the conducting voltage of clamper at V1+D1, protected computing to send out device big; When input voltage is lower than V2, also conducting of D1, D2, same voltage is with regard to the conducting voltage of clamper at V2-D1.Simultaneously, do not influence the differentiation of signal.
Simultaneously, described differential amplifier circuit also comprises pull down resistor the 4th resistance R 4 and the 8th resistance R 8, be used for detect interface when unusual two inputs at amplifier U1 produce voltage differences, report DC over current protector unusual.R4, the R8 resistance can be very big, is generally more than the 100K Ω.When not connecting, detection streamer, report DC over current protector unusual by the drop-down pressure reduction that produces on this.
Above, described the 3rd resistance R 3, the 5th resistance R 5, the 6th resistance R 6 and the 7th resistance R 7, its resistance satisfies amplification ratio I=R5/R3=R6/R7.Because amplifier is voltage=reference voltage ((V0+V1)/2)+detection voltage difference * amplification ratio after amplifying (conditioning), generally getting amplification ratio is 5≤I≤50.Voltage after the feasible conditioning is convenient to the subsequent conditioning circuit discriminating processing in 0～3V.
Signal judgement unit, the working signal that is used for the processing of sending according to differential amplifier circuit are differentiated whether operation irregularity of DC over current protector, and when operation irregularity output alarm information.Utilizing the small voltage difference in fuse two ends to carry out fuse state detects.
Described signal judgement unit specifically can adopt two kinds of implementations:
Scheme one
As shown in Figure 4, described signal judgement unit comprises A/D converter and MCU processor, wherein, A/D converter, being used for the voltage transitions of amplifier output is the readable output digital signal of MCU processor;
The MCU processor is judged according to the threshold value that sets in advance, if the output digital signal has surpassed this threshold value, MCU comprises up warning information with regard to output alarm signal.
Scheme two
As shown in Figure 5, utilize comparator circuit, relatively whether the voltage Vf of the detected DC over current protector of differential amplifier circuit exceeds predetermined voltage range, and when exceeding predetermined voltage range output alarm signal.Because the resistance Rr of DC over current protector is generally very little; determine that according to the maximum current Ir that may flow through electric current both end voltage difference is greater than certain value; leave certain surplus DC over current protector voltage limit deviation Vy just again, just can think that DC over current protector has disconnected.
Described specifically comparator circuit judges the process whether the voltage Vf of DC over current protector exceeds predetermined voltage range comprises judging whether Vf satisfies:
V1/2+Vy+(Rr×Ir)×(R3/R5)＞Vf＞V1/2-Vy-(Rr×Ir)×(R3/R5)；
In the formula:
Vy is DC over current protector voltage limit deviation;
Rr is the internal resistance value of DC over current protector;
Ir is the maximum current by DC over current protector;
R3 is the resistance value of the 3rd resistance;
R5 is the resistance value of the 5th resistance;
As satisfying, show that DC over current protector is working properly, otherwise, output alarm signal.
The value of Vy is important in the present invention, obtains very for a short time as Vy, just is judged to inefficacy in case exceed this scope fuse.The normal work of warning influence that will be frequent.Simultaneously because the resistance (Rr) of DC over current protector is very little, and consistency is not fine, and surplus Vy just needs to amplify a bit.
Differentiate part as use comparator, just need two comparators, respectively two threshold values relatively.Just a comparator judges whether Vf satisfies:
V1/2+Vy+(Rr×Ir)×(R3/R5)＞Vf；
Another comparator judges that Vf does not satisfy:
Vf＞V1/2-Vy-(Rr×Ir)×(R3/R5)。
In addition, in order to protect comparator circuit, described comparator circuit also comprises the comparator protective circuit, is serially connected with the input of comparator circuit, is used to prevent that the signal after differential amplifier circuit is handled from surpassing the input range of comparator circuit.Described comparator protective circuit comprises the 9th resistance R 9 and voltage-stabiliser tube D3; the 9th resistance R 9 is series at the input of comparator circuit and the output of differential amplifier circuit, and voltage-stabiliser tube D3 is series at the input of comparator circuit and the equipotential end V0 of DC over current protector.The effect of D3, R9 is the input range that surpasses discrimination module for the signal after preventing to amplify.
At last, described DC over current protector detection system also comprises warning circuit, is used for after receiving alarm signal the output sound and light alarm.Can export sound and light alarm through differentiating after alarm signal is afterwards handled, can show by LED.The remote auto alarm is by the MCU information processing, again by up long-range reporting such as serial ports, CAN-BUS bus, TCP/IP.Report the DC over current protector state at remote live.
In sum; embodiment provided by the invention detects with small voltage (mV level even the μ V level) difference at DC over current protector two ends; utilize the voltage difference at DC over current protector two ends; carry out the differential amplification of suitable multiple through amplifier U1; discriminating processing detects the DC over current protector state then.Simultaneously, as the reference voltage of the input of the differential amplification of amplifier U1 being decided to be 1/2 size of amplifier U1 forward operating voltage.Like this, detects voltage difference * amplification ratio because amplifier U1 amplifies (conditioning) back voltage=reference voltage (V0+V1)/2+, reverse when the cable installation, or when negative voltage occurring, the detection voltage difference is a negative, but reference voltage is (V0+V1)/2, much larger than zero potential.So the voltage after the conditioning is greater than zero potential, the detection in later stage is handled can carry out normal handling.As seen, oppositely also can normally detect fuse state in the installation of fuse state detection streamer.
Pull down resistor on increasing on the DC over current protector state-detection cable makes it can produce the alarm of DC over current protector abnormal state when not being connected to the DC over current protector two ends.Also can produce the alarm of DC over current protector state under the situation that does not connect, comes off at detection streamer.
If DC over current protector disconnects, have only minimum electric current to flow through load.This minimum electric current can not bring the driving that should not have to load.The situation that this while DC over current protector disconnects can the compatible state that detects the auxiliary contact type of air switch, also can detect the method for the state of regular tap amount.When being installed in as DC over current protector that the both end voltage difference is very little on the back-up source in addition,, can detect fuse state too because adopted amplifier among the embodiment provided by the invention.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (13)
1, a kind of DC over current protector detection method is characterized in that, comprising:
Detect the electric parameter at DC over current protector two ends; After described electric parameter carried out processing and amplifying, the electric parameter of crossing according to processing and amplifying was differentiated whether operation irregularity of DC over current protector, and when operation irregularity output alarm information.
2, DC over current protector detection method according to claim 1 is characterized in that, this method specifically comprises: the voltage difference that detects the DC over current protector two ends; After described voltage difference carried out the difference processing and amplifying, the voltage difference of crossing according to the difference processing and amplifying was differentiated whether operation irregularity of DC over current protector, and when operation irregularity output alarm information.
3, a kind of DC over current protector detection system is characterized in that, comprise detecting interface, differential amplifier circuit and signal judgement unit, wherein:
Detect interface, connect overcurrent protector and differential amplifier circuit, described differential amplifier circuit is by detecting the electric parameter that interface detects the DC over current protector two ends;
Amplifying circuit, input connects the DC over current protector two ends by detecting interface, output termination signal judgement unit the electric parameter at detected DC over current protector two ends is carried out processing and amplifying, and the working signal that will handle is sent to the signal judgement unit;
Signal judgement unit, the working signal that is used for the processing of sending according to differential amplifier circuit are differentiated whether operation irregularity of DC over current protector, and when operation irregularity output alarm information.
4, DC over current protector detection system according to claim 3 is characterized in that, and is described
Differential amplifier circuit; input connects the DC over current protector two ends by detecting interface; output termination signal judgement unit the electric parameter at detected DC over current protector two ends is carried out the difference processing and amplifying, and the working signal that will handle is sent to the signal judgement unit.
5, DC over current protector detection system according to claim 4 is characterized in that, described differential amplifier circuit comprises amplifier, the 3rd resistance, the 5th resistance, the 6th resistance and the 7th resistance, wherein:
The electrode input end of described amplifier is by an end of the 5th resistance connection DC over current protector, and the negative input of amplifier connects the other end of DC over current protector by the 6th resistance; The electrode input end of amplifier also connects the reference voltage contact by the 3rd resistance, and the negative input of amplifier connects the output of amplifier by the 7th resistance.
6, DC over current protector detection system according to claim 4 is characterized in that, described differential amplifier circuit also comprises:
Two groups of protection circuits are connected to two inputs of amplifier respectively, are used for guard amplifier, prevent to damage when externally input signal surpasses amplifier work common-mode voltage amplifier; And/or,
The 4th resistance and the 8th resistance, as last pull down resistor, be used for detect interface when unusual two inputs at amplifier produce voltage differences, report DC over current protector unusual and/or,
Reference voltage provides circuit, comprises first resistance and second resistance, and first resistance and second resistance string are connected to the equipotential end of DC over current protector and the anodal operating voltage end of amplifier; First resistance is the reference voltage contact with the contact of connecting of second resistance.
7, DC over current protector detection system according to claim 6, it is characterized in that, described protection circuit comprises two order diode in series, the anodal termination amplifier negative pole operating voltage end in series connection back, negative pole termination amplifier anode operating voltage end; The series connection contact connects amplifier input terminal.
8, DC over current protector detection system according to claim 3 is characterized in that, described signal judgement unit comprises:
A/D converter is the voltage transitions of amplifier output the readable output digital signal of MCU processor;
The MCU processor is judged according to the threshold value that sets in advance, if the output digital signal has surpassed this threshold value, MCU also comprises the alarm signal that output is up alternatively with regard to output alarm signal.
9, DC over current protector detection system according to claim 3 is characterized in that, described signal judgement unit comprises:
Comparator circuit, whether the voltage Vf that is used for the detected DC over current protector of comparison differential amplifier circuit exceeds predetermined voltage range, and when exceeding predetermined voltage range output alarm signal.
10, DC over current protector detection system according to claim 9 is characterized in that, described comparator circuit judges the process whether the voltage Vf of DC over current protector exceeds predetermined voltage range comprises judging whether Vf satisfies:
V1/2+Vy+(Rr×Ir)×(R3/R5)＞Vf＞V1/2-Vy-(Rr×Ir)×(R3/R5)；
In the formula:
Vy is DC over current protector voltage limit deviation;
Rr is the internal resistance value of DC over current protector;
Ir is the maximum current by DC over current protector;
R3 is the resistance value of the 3rd resistance;
R5 is the resistance value of the 5th resistance;
As satisfying, show that DC over current protector is working properly, otherwise, output alarm signal.
11, according to Claim 8 or 9 described DC over current protector detection systems, it is characterized in that described comparator circuit also comprises:
The comparator protective circuit is serially connected with the input of comparator circuit, is used to prevent that the signal after differential amplifier circuit is handled from surpassing the input range of comparator circuit.
12, DC over current protector detection system according to claim 11; it is characterized in that; described comparator protective circuit comprises the 9th resistance and voltage-stabiliser tube; the 9th resistance string is coupled to the input of comparator circuit and the output of differential amplifier circuit, and voltage-stabiliser tube is series at the input of comparator circuit and the equipotential end of DC over current protector.
13, DC over current protector detection system according to claim 3 is characterized in that, described system also comprises:
Warning circuit is used for after receiving alarm signal, output alarm information.
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| CNB200610170565XA CN100486069C (en) | 2006-12-26 | 2006-12-26 | Method and system for detecting DC over current protector |
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|---|---|---|---|
| CNB200610170565XA CN100486069C (en) | 2006-12-26 | 2006-12-26 | Method and system for detecting DC over current protector |
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| CN101005202A true CN101005202A (en) | 2007-07-25 |
| CN100486069C CN100486069C (en) | 2009-05-06 |
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| CNB200610170565XA Expired - Fee Related CN100486069C (en) | 2006-12-26 | 2006-12-26 | Method and system for detecting DC over current protector |
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| CN101452017B (en) * | 2007-11-30 | 2011-10-26 | 英业达股份有限公司 | Full automatic over current protection test system and method |
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| EP2662696A4 (en) * | 2011-02-12 | 2015-06-03 | Zte Corp | Device and method for detecting state of overload and overcurrent protector |
| WO2012106953A1 (en) * | 2011-02-12 | 2012-08-16 | 中兴通讯股份有限公司 | Device and method for detecting state of overload and overcurrent protector |
| US9116211B2 (en) | 2011-02-12 | 2015-08-25 | Zte Corporation | Device and method for detecting state of overload and overcurrent protector |
| CN103492894A (en) * | 2011-04-15 | 2014-01-01 | 艾思玛太阳能技术股份公司 | Method and apparatus for determining a fault current portion in a differential current |
| CN103492894B (en) * | 2011-04-15 | 2015-09-09 | 艾思玛太阳能技术股份公司 | For determining the method and apparatus of the fault current component of difference current |
| CN102403690A (en) * | 2011-12-07 | 2012-04-04 | 西北工业大学 | Overcurrent protection circuit |
| CN103792445A (en) * | 2014-01-16 | 2014-05-14 | 厦门立林电气控制技术有限公司 | Fully intelligent electric power overcurrent protection tester |
| CN109212372A (en) * | 2018-11-06 | 2019-01-15 | 格力电器（武汉）有限公司 | A kind of overcurrent protector automatic test approach, system and device |
| CN109274060A (en) * | 2018-11-27 | 2019-01-25 | 常熟开关制造有限公司(原常熟开关厂） | A kind of breaker |
| CN117175487A (en) * | 2023-11-02 | 2023-12-05 | 江苏慕林智造科技股份有限公司 | Short-circuit protection circuit, method and readable storage medium |
| CN117175487B (en) * | 2023-11-02 | 2024-02-06 | 江苏慕林智造科技股份有限公司 | Short-circuit protection circuit, method and readable storage medium |
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Assignee: Zhuhai Fenglan Industrial Co., Ltd. Assignor: Huawei Technologies Co., Ltd. Contract record no.: 2010440001254 Denomination of invention: Method and system for detecting DC over current protector Granted publication date: 20090506 License type: Exclusive License Open date: 20070725 Record date: 20100819 |
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