CN1917320A - Fault arc protection circuit and fault arc detection method - Google Patents
Fault arc protection circuit and fault arc detection method Download PDFInfo
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- CN1917320A CN1917320A CN 200510036783 CN200510036783A CN1917320A CN 1917320 A CN1917320 A CN 1917320A CN 200510036783 CN200510036783 CN 200510036783 CN 200510036783 A CN200510036783 A CN 200510036783A CN 1917320 A CN1917320 A CN 1917320A
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- 238000001514 detection method Methods 0.000 title claims abstract description 32
- 238000010891 electric arc Methods 0.000 claims abstract description 65
- 238000005070 sampling Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 6
- 230000001681 protective effect Effects 0.000 claims description 19
- 230000005611 electricity Effects 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 230000001939 inductive effect Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
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Abstract
The invention discloses a fault arc protection circuit and a fault arc detection method, which can detect dangerous arcs through a protection circuit and belong to the field of electronics. The method comprises the following steps: the current signal is sampled in real time through the signal sampling device, sampling data are provided for the signal processing module, after the current signal is processed by the signal processing module, a result is transmitted to the arc detection control device for detection, the arc detection control device generates an arc mark when detecting an arc, and a control signal for cutting off a circuit is sent out, so that the load is protected. The invention has the advantages that: when the electric appliance is used, if the circuit generates intermittent electric arc, the method can detect the electric arc in time and cut off the power supply by depending on the protection circuit, thereby preventing the occurrence of electric arc fire.
Description
Technical field
The present invention relates to a kind of fault electric arc protective circuit and fault arc detection method, belong to electronic applications.
Background technology
In recent years, along with popularizing of household electrical appliance, electrical fire is in rising trend, and wherein fault electric arc (electric arc, electric spark) is the main cause that causes electrical fire.Fault electric arc is divided into parallel arc fault, earth fault electric arc and continuous fault electric arc again.
At present, the overcurrent of electric wiring, electric leakage, overvoltage protection can only play a protective role to parallel arc fault, earth fault electric arc, and can not play a protective role to continuous fault electric arc.
Current existing fault electric arc protective device is primarily aimed at the fault electric arc that occurs in the power circuit, it is characterized in that the electric arc of the big electric current continuous discharge generation that moment produces; For the fault electric arc that occurs in the electric appliance circuits, the continuous fault electric arc as the circuit coupling part produces does not also have reliable protection.Whether the detection method that present most of fault electric arc protective circuit adopts also only is to make according to the variation of current waveform having fault electric arc to take place, and accuracy and anti-interference are very poor.Therefore also there is very big defective in the protection of the electrical fire that causes for continuous fault electric arc.
Summary of the invention
The invention provides a kind of fault electric arc protective circuit and fault arc detection method that when continuous electric arc occurring in the protected circuit, can detect dangerous electric arc and automatic shutdown circuit.When continuous fault electric arc occurring in protected circuit, this method can in time detect electric arc and cut off the electricity supply before electric arc causes electrical fire by the fault electric arc protective circuit, thereby avoids the generation of fire or major event, reaches the protection to electrical equipment.
Realize technical scheme of the present invention:
The fault electric arc protective circuit comprises power unit, and described fault electric arc protective circuit also comprises signal sampling device, signal processing module, arc-detection control device and the module of cutting off the electricity supply.
Described signal sampling device comprises the not current transformer and the R of ribbon core
3Build-out resistor, R
3Build-out resistor is connected the two ends of current transformer; Described signal processing module is by rectifying tube D1, divider resistance R
2Polyphone connects; Described arc-detection control device is a single-chip microcomputer, and described single-chip microcomputer also is connected with reset circuit, and described reset circuit is connected with DC power supply and resistance R
1The described module of cutting off the electricity supply has connected triode and actuator's part successively.
Described actuator partly is the normally-closed contact relay.
Fault arc detection method, this method can detect dangerous electric arc by the fault electric arc protective circuit, it is characterized in that comprising step:
In real time current signal is sampled by signal sampling device, and sampled data is offered signal processing module;
Signal processing module is handled current signal, the result is passed to the arc-detection control device detect, and when the arc-detection control device detects electric arc, produces the electric arc sign.
Wherein:
The signal of described signal sampling device sampling is a current waveform;
Described signal processing module is handled current waveform;
Described arc-detection control device is judged, is detected the current waveform after handling.
Advantage of the present invention is: when making electrical appliance, if when producing continuous fault electric arc in the circuit, can in time detect electric arc and cut off the electricity supply, prevent the generation of electric arc fire effectively.
Description of drawings
Fig. 1 is the circuit theory diagrams of the embodiment of the invention one.
Fig. 2 is the flow chart that single-chip microcomputer is judged, detected the current waveform of handling.
Fig. 3, Fig. 4 are the flow charts that Single Chip Microcomputer (SCM) program is interrupted.
Embodiment
Protected circuit is by AC220V input 8 input 220V alternating voltages, through the normally-closed contact relay 9 of fault electric arc protective circuit, by 11 outputs of AC220V output, for protected circuit provides power supply.Protected circuit connects this fault electric arc protective circuit, and DC power supply 1 provides power supply, build-out resistor for the fault electric arc protective circuit
R33 are connected the two ends of current transformer 2.The ac current signal that current transformer 2 detects in the protected circuit that passes it.Circuit just often, current transformer 2 detected waveforms are to be 50 hertz pulse current waveform in the cycle; When circuit is little electric current inductive load, when circuit had electric arc to take place, the cycle of the inductive waveform of current transformer 2 changed; When circuit is a large current load, when circuit had electric arc to take place, the amplitude of the inductive waveform of current transformer 2 changed, and waveform distorts.This detected current signal is by rectifier diode 4 rectifications then, and by resistance R
2Become direct current signal after 5 dividing potential drops, then this direct current signal is input to single-chip microcomputer 7, single-chip microcomputer 7 has judged whether fault electric arc.When not detecting fault electric arc, single-chip microcomputer 7 sends low level signal, and triode 10 ends, and power supply provides operating voltage by normally-closed contact relay 9 for protected electrical equipment; When having fault electric arc to produce in detecting protected circuit, single-chip microcomputer 7 sends high-level control signal, makes triode 10 conductings; the normally-closed contact relay 9 that is positioned at collector electrode this moment disconnects; realization is cut off the electricity supply, and reaches the protection to circuit, avoids the generation of electrical fire.After fault electric arc was got rid of, power supply passed through resistance R
16 again to the fault secure circuit power-on-reset, and single-chip microcomputer restarts work.
As Fig. 2, Fig. 3, shown in Figure 4, the workflow of single-chip microcomputer is as follows:
(1) single-chip microcomputer carries out electrification reset, arrives step 2 then;
(2) Single Chip Microcomputer (SCM) program initialization, this moment, all flag bits were 0, analog signal conversion is that value corresponding is expressed as AD after the digital signal, and AD0=AD1=AD2=0 there is this moment, the AD signal sampling is from a pin input of single-chip microcomputer, the AD control signal arrives step 3 then by another pin output of single-chip microcomputer;
(3) single-chip microcomputer judges whether the AD conversion is finished, and when not having new AD value to produce, AD converts and is masked as 0, and continues to judge whether that new AD value produces; When new AD value produced, AD converted and is masked as 1, arrives step 4 then;
(4) zero clearing AD converts sign, regularly A timing, and timing arrives, and then arrives step 5, otherwise to step 6;
(5) find that the electric arc number of times is set to zero, regularly step 6 is arrived in the A reclocking then;
(6) pulse detection, the pulse number of the current waveform that the detection current transformer induces arrives step 7 then;
(7) preserve current AD value, current AD conversion value is saved as AD0, arrive step 8 then;
(8) judge whether three variables A D0, AD1, AD2 satisfy this relation of AD2＞AD0＞AD1, satisfied then to step 9, otherwise to step 10;
(9) find that the electric arc number of times adds 1, arrives step 10 then;
(10) upgrade AD1, AD2 value, the AD0 value is saved in AD1, the AD1 value is saved in AD2, arrives step 11 then;
(11) regularly B timing, timing be to then forwarding step 15 to, otherwise forward step 12 to;
(12) pulse number and set point 1 relatively if detected pulse number greater than set point 1, then arrives step 13, otherwise arrive step 14;
(13) find that the electric arc number of times adds 1, arrives step 14 then;
(14) seek ADmax, in timing B, seek maximum AD conversion value, save as ADmax, arrive step 19 then;
(15) regularly C timing, timing arrives and then arrives step 17, otherwise to step 16;
(16) seek min_MAX, in timing C, seek the minimum value among all ADmax, save as min_MAX, arrive step 19 then;
(17) min_MAX comparison value and set point 2 comparisons, promptly min_MAX0 deducts difference and set point 2 comparisons that min_MAX1 obtains, if difference greater than set point 2, then arrives step 18, otherwise to step 19, and this moment min_MAX0 is saved as min_MAX1;
(18) find that the electric arc number of times adds 1, arrives step 19 then;
(19) find electric arc number of times and set point 3 relatively, if find that the electric arc number of times greater than set point 3, then arrives step 20, otherwise to step 3;
(20) cut off the electricity supply, single-chip microcomputer will be controlled the output pin level and be changed to high level, the triode conducting, and actuator disconnects, and realizes cutting off the electricity supply.
Single-chip microcomputer is a timing sampling, and when in the following dual mode being arranged a kind of the appearance, interrupt routine is carried out in singlechip interruption work, and then continues to work on from the place of interrupting.
(1) regularly interrupt, a time period T is set, every time T, program will be interrupted by self-timing, in the reclocking again of having no progeny;
(2) AD converts interruption, preserves current value, and set AD converts sign, and promptly AD converts and is masked as 1.
If those skilled in the art has made change unsubstantiality, conspicuous or improvement according to the present invention, all should belong to the scope of claim protection of the present invention.
Claims (10)
1, fault electric arc protective circuit; comprise power unit (1); it is characterized in that: described fault electric arc protective circuit also comprises signal sampling device, signal processing module, arc-detection control device and the module of cutting off the electricity supply, and described signal sampling device comprises not current transformer of ribbon core (2) and R
3Build-out resistor (3), R
3Build-out resistor (3) is connected the two ends of current transformer (2); Described signal processing module is by rectifying tube D1 (4), divider resistance R
2(5) polyphone connects; Described arc-detection control device (7) is a single-chip microcomputer; The described module of cutting off the electricity supply has connected triode (10) and actuator's part (9) successively.
2, fault electric arc protective circuit according to claim 1 is characterized in that: described single-chip microcomputer (7) also is connected with reset circuit, and described reset circuit is connected with DC power supply (12) and resistance R
1(6).
3, fault electric arc protective circuit according to claim 1 is characterized in that: described actuator's part (9) is the normally-closed contact relay.
4, fault arc detection method, this method can detect dangerous electric arc by above-mentioned fault electric arc protective circuit, it is characterized in that comprising step:
In real time current signal is sampled by signal sampling device, and the sample rate current signal offered signal processing module, signal processing module is handled current signal, the result is passed to the arc-detection control device to be detected, when the arc-detection control device detects when in the electric current electric arc being arranged, produce the electric arc sign.
5, fault arc detection method according to claim 4 is characterized in that: the signal of described signal sampling device sampling is a current waveform.
6, fault arc detection method according to claim 4, it is characterized in that: signal processing module is handled current waveform.
7, fault arc detection method according to claim 4 is characterized in that: the arc-detection control device is judged, is detected the current waveform of handling.
8, fault arc detection method according to claim 4 is characterized in that: arc-detection control device (7) is a single-chip microcomputer, and its flow process of judging, detecting the current waveform program is as follows:
(1) single-chip microcomputer carries out electrification reset, arrives step 2 then;
(2) Single Chip Microcomputer (SCM) program initialization, this moment, all flag bits were 0, analog signal conversion is that value corresponding is expressed as AD after the digital signal, and AD0=AD1=AD2=0 there is this moment, the AD signal sampling is from a pin input of single-chip microcomputer, the AD control signal arrives step 3 then by another pin output of single-chip microcomputer;
(3) single-chip microcomputer judges whether the AD conversion is finished, and when not having new AD value to produce, AD converts and is masked as 0, and continues to judge whether that new AD value produces; When new AD value produced, AD converted and is masked as 1, arrives step 4 then;
(4) zero clearing AD converts sign, regularly A timing, and timing arrives, and then arrives step 5, otherwise to step 6;
(5) find that the electric arc number of times is set to zero, regularly step 6 is arrived in the A reclocking then;
(6) pulse detection, the pulse number of the current waveform that the detection current transformer induces arrives step 7 then;
(7) preserve current AD value, current AD conversion value is saved as AD0, arrive step 8 then;
(8) judge whether three variables A D0, AD1, AD2 satisfy this relation of AD2＞AD0＞AD1, satisfied then to step 9, otherwise to step 10;
(9) find that the electric arc number of times adds 1, arrives step 10 then;
(10) upgrade AD1, AD2 value, the AD0 value is saved in AD1, the AD1 value is saved in AD2, arrives step 11 then;
(11) regularly B timing, timing be to then forwarding step 15 to, otherwise forward step 12 to;
(12) pulse number and set point 1 relatively if detected pulse number greater than set point 1, then arrives step 13, otherwise arrive step 14;
(13) find that the electric arc number of times adds 1, arrives step 14 then;
(14) seek ADmax, in timing B, seek maximum AD conversion value, save as ADmax, arrive step 19 then;
(15) regularly C timing, timing arrives and then arrives step 17, otherwise to step 16;
(16) seek min_MAX, in timing C, seek the minimum value among all ADmax, save as min_MAX, arrive step 19 then;
(17) min_MAX comparison value and set point 2 comparisons, promptly min_MAX0 deducts difference and set point 2 comparisons that min_MAX1 obtains, if difference greater than set point 2, then arrives step 18, otherwise to step 19, and this moment min_MAX0 is saved as min_MAX1;
(18) find that the electric arc number of times adds 1, arrives step 19 then;
(19) find electric arc number of times and set point 3 relatively, if find that the electric arc number of times greater than set point 3, then arrives step 20, otherwise to step 3;
(20) cut off the electricity supply, single-chip microcomputer will be controlled the output pin level and be changed to high level, the triode conducting, and actuator disconnects, and realizes cutting off the electricity supply.
9, fault arc detection method according to claim 8, it is characterized in that: single-chip microcomputer detects, judges that the program of electric current comprises interrupt routine: regularly interrupt, a time period T is set, every time T, program will self-timing be interrupted, in the reclocking again of having no progeny.
10, fault arc detection method according to claim 8, it is characterized in that: single-chip microcomputer detects, judges that the program of electric current also comprises interrupt routine: AD converts interruption, preserve current value, set AD converts sign, and promptly AD converts and is masked as 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510036783XA CN100452598C (en) | 2005-08-19 | 2005-08-19 | Fault arc protection circuit and fault arc detection method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510036783XA CN100452598C (en) | 2005-08-19 | 2005-08-19 | Fault arc protection circuit and fault arc detection method |
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| CN1917320A true CN1917320A (en) | 2007-02-21 |
| CN100452598C CN100452598C (en) | 2009-01-14 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100432683C (en) * | 2005-03-31 | 2008-11-12 | 珠海格力电器股份有限公司 | Fault arc detection method and protection circuit thereof |
| CN101154800B (en) * | 2007-09-29 | 2010-11-17 | 吴为麟 | Device for detecting trouble electric arc |
| CN104459471A (en) * | 2014-12-17 | 2015-03-25 | 施耐德万高（天津）电气设备有限公司 | Arc fault detection device based on POE technology |
| CN105162080A (en) * | 2015-08-07 | 2015-12-16 | 珠海格力电器股份有限公司 | Inductive load low-voltage protection circuit and protection method |
| CN106054009A (en) * | 2016-08-19 | 2016-10-26 | 广东美的制冷设备有限公司 | Household electrical appliance and fault arc detection device and method used therefor |
| CN107314610A (en) * | 2017-06-29 | 2017-11-03 | 青岛海尔股份有限公司 | Breakdown of refrigerator detecting system and its detection method |
| US11444443B2 (en) | 2016-08-19 | 2022-09-13 | Gd Midea Air-Conditioning Equipment Co., Ltd. | Household appliance and apparatus and method for detecting arc fault in the same |
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| CN102684138A (en) * | 2012-05-15 | 2012-09-19 | 董右云 | Method and device for detecting and processing firing phenomenon of power line |
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| US6552884B2 (en) * | 2000-05-12 | 2003-04-22 | Human El Tech, Inc. | Circuit breaker with display function |
| US7035066B2 (en) * | 2000-06-02 | 2006-04-25 | Raytheon Company | Arc-default detecting circuit breaker system |
| CN1248000C (en) * | 2001-09-16 | 2006-03-29 | 薛小平 | Fault arc current detection circuit |
| CN100370664C (en) * | 2004-09-30 | 2008-02-20 | 宁波习羽电子发展有限公司 | Arc and leakage protector |
| CN100432683C (en) * | 2005-03-31 | 2008-11-12 | 珠海格力电器股份有限公司 | Fault arc detection method and protection circuit thereof |
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2005
- 2005-08-19 CN CNB200510036783XA patent/CN100452598C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100432683C (en) * | 2005-03-31 | 2008-11-12 | 珠海格力电器股份有限公司 | Fault arc detection method and protection circuit thereof |
| CN101154800B (en) * | 2007-09-29 | 2010-11-17 | 吴为麟 | Device for detecting trouble electric arc |
| CN104459471A (en) * | 2014-12-17 | 2015-03-25 | 施耐德万高（天津）电气设备有限公司 | Arc fault detection device based on POE technology |
| CN105162080A (en) * | 2015-08-07 | 2015-12-16 | 珠海格力电器股份有限公司 | Inductive load low-voltage protection circuit and protection method |
| CN105162080B (en) * | 2015-08-07 | 2018-01-19 | 珠海格力电器股份有限公司 | Inductive load low-voltage protection circuit and protection method |
| CN106054009A (en) * | 2016-08-19 | 2016-10-26 | 广东美的制冷设备有限公司 | Household electrical appliance and fault arc detection device and method used therefor |
| CN106054009B (en) * | 2016-08-19 | 2019-01-29 | 广东美的制冷设备有限公司 | Household appliance and fault arc detection device and method for it |
| US11444443B2 (en) | 2016-08-19 | 2022-09-13 | Gd Midea Air-Conditioning Equipment Co., Ltd. | Household appliance and apparatus and method for detecting arc fault in the same |
| CN107314610A (en) * | 2017-06-29 | 2017-11-03 | 青岛海尔股份有限公司 | Breakdown of refrigerator detecting system and its detection method |
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|---|---|
| CN100452598C (en) | 2009-01-14 |
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