CN102904210A - Leakage protection method, leakage protection device and water heater - Google Patents
Leakage protection method, leakage protection device and water heater Download PDFInfo
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- CN102904210A CN102904210A CN201210378324XA CN201210378324A CN102904210A CN 102904210 A CN102904210 A CN 102904210A CN 201210378324X A CN201210378324X A CN 201210378324XA CN 201210378324 A CN201210378324 A CN 201210378324A CN 102904210 A CN102904210 A CN 102904210A
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Abstract
The invention discloses a leakage protection method, a leakage protection device and a water heater, wherein the leakage protection method comprises the steps as follows: step S101, inducting residual current in a loop and converting the residual current into a current signal; step S102, comparing the residual current in the current signal with a predetermined value and converting the current signal into a corresponding voltage signal according to a comparative result; and step S103, carrying out corresponding protection operations according to the voltage signal. According to the leakage protection method and the leakage protection device, by inducting the residual current in the loop and converting the residual current into the current signal, comparing the residual current in the current signal with the predetermined value, converting the current signal into the corresponding voltage signal and carrying out the corresponding protection operations according to the corresponding voltage signal, the safety and the reliability of electrical appliances are improved.
Description
Technical field
The present invention relates to technical field of water heaters, especially relate to a kind of earth leakage protecting method and device, and the water heater with this earth leakage protective device.
Background technology
Water heater is as a kind of special electric equipment products, and security performance is particularly important, because the hot water of its output can directly contact with human body, in case electric leakage, residual current surpasses certain numerical value, the life security that may jeopardize the people.A kind of electric shock prevention type electric water heater is arranged in the prior art, by the length on increase insulation outlet pipe road, and then increase resistance, reduce water outlet voltage with this, make its safe voltage that is lower than human body (36V).Therefore, when ground wire is unreliable electric leakage occurs, can not make people's injury that gets shocked yet.
But its shortcoming is, insulating material is easily aging, and after insulating material was aging, it is unreliable that the method will become, and still there is the danger of electric shock in the people.Therefore, existing water heater is badly in need of a kind of safe and reliable earth leakage protective device.
Summary of the invention
Main purpose of the present invention is to provide a kind of safe and reliable earth leakage protecting method and device, and the water heater with this earth leakage protective device.
To achieve these objectives, the present invention proposes a kind of earth leakage protecting method, comprising:
Residual current in step S101, the loop inductance also is converted into current signal;
Step S102, the residual current in the described current signal and preset value are compared, and according to comparative result described current signal is converted into corresponding voltage signal;
Step S103, take corresponding protection operation according to described voltage signal.
Preferably, described step S102 comprises:
Step S201, the residual current in the described current signal and preset value are compared;
If the described residual current of step S202 then is converted into low level signal with this current signal less than preset value;
If the described residual current of step S203 then is converted into high level signal with this current signal more than or equal to preset value.
Preferably, described step S103 comprises:
If step S301 voltage signal is low level signal, then ignores this low level signal and do not respond;
If step S302 voltage signal is high level signal, then controls and use the electric loading deenergization.
Preferably, also comprise after the described step S302:
Step S407, generation information warning also show.
The present invention proposes a kind of earth leakage protective device simultaneously, comprising:
Induction module passes to signal processing module after being used for the residual current of loop inductance and being converted into current signal;
Signal processing module, for detection of and receive described current signal, the residual current in the described current signal and preset value are compared, and pass to main control module after according to comparative result described current signal being converted into corresponding voltage signal;
Main control module is used for receiving described voltage signal and takes corresponding protection operation.
Preferably, after described signal processing module also is used for the residual current of described current signal and preset value compared, if described residual current more than or equal to preset value, then is converted into this current signal high level signal and passes to main control module; If described residual current less than preset value, then is converted into this current signal low level signal and passes to main control module.
Preferably, described main control module also is used for receiving described high level signal and the electric loading deenergization is used in control, receives described low level signal and ignore this low level signal not respond.
Preferably, also comprise alarm module, described main control module produces information warning and controls alarm module and shows described information warning.
Preferably, described induction module comprises zero sequence current mutual inductor, and the zero line in the described loop and live wire pass described zero sequence current mutual inductor sense in the same direction.
The present invention also proposes a kind of water heater, and it comprises earth leakage protective device, and described earth leakage protective device comprises induction module, passes to signal processing module after being used for the residual current of loop inductance and being converted into current signal; Signal processing module, for detection of and receive described current signal, the residual current in the described current signal and preset value are compared, and pass to main control module after according to comparative result described current signal being converted into corresponding voltage signal; Main control module is used for receiving described voltage signal and takes corresponding protection operation.
A kind of earth leakage protecting method provided by the present invention and device; by the residual current in the induction module loop inductance and delivered current signal; signal processing module is according to the comparison of the residual current in the current signal and preset value; send main control module to after current signal is converted into corresponding voltage signal; main control module is taked corresponding protection operation according to corresponding voltage signal again, thereby has improved the safety and reliability of electrical equipment.
Description of drawings
Fig. 1 is the flow chart of earth leakage protecting method the first embodiment of the present invention;
Fig. 2 is another flow chart of earth leakage protecting method the first embodiment of the present invention;
Fig. 3 is another flow chart of earth leakage protecting method the first embodiment of the present invention;
Fig. 4 is the flow chart of earth leakage protecting method the second embodiment of the present invention;
Fig. 5 is the structural representation of earth leakage protective device the first embodiment of the present invention;
Fig. 6 is the circuit diagram of earth leakage protective device of the present invention;
Fig. 7 is the structural representation of earth leakage protective device the second embodiment of the present invention.
The realization of the object of the invention, functional characteristics and advantage are described further with reference to accompanying drawing in connection with embodiment.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
Referring to Fig. 1, earth leakage protecting method the first embodiment of the present invention is proposed, described earth leakage protecting method may further comprise the steps:
Residual current in step S101, the induction module loop inductance and be converted into current signal after pass to signal processing module.
Induction module in the present embodiment is preferably by the electric current between zero line in the zero sequence current mutual inductor loop inductance and the live wire, the electric leakage if the loop is short-circuited, electric current between zero live wire will be uneven, and zero sequence current mutual inductor can be responded to unbalanced electric current, also be residual current, and secondary this current signal passed to signal processing module by it.
Step S102, described signal processing module compare the residual current in the described current signal and preset value, and pass to main control module after according to comparative result described current signal being converted into corresponding voltage signal.
Among this step S102, the real-time sensed current signal of signal processing module and received current signal.
Further, this step S102 is specifically as shown in Figure 2:
Step S201, described signal processing module compare the residual current in the described current signal and preset value.
The current value that preset value among this step S201 is namely preset, common 10 ~ 15mA is lower than the residual current of preset value to human-body safety, can not work the mischief.
If the described residual current of step S202 less than preset value, then is converted into this current signal low level signal and passes to main control module.
If the described residual current of step S203 more than or equal to preset value, then is converted into this current signal high level signal and passes to main control module.
Signal processing module compares judgement to current signal, sends corresponding voltage signal according to comparative result to main control module, i.e. high level signal or low level signal.
Step S103, described main control module receive described voltage signal and take corresponding protection operation.
Among this step S103, main control module receives the operation of taking behind the voltage signal, decides on concrete voltage signal.
Further, step S103 is specifically as shown in Figure 3:
Step 300, described main control module receive described voltage signal and take corresponding protection operation.
Step 301, described main control module receive described low level signal, then ignore this low level signal and do not respond.
If the voltage signal that main control module receives is low level signal, residual current then is described less than or equal to preset value, to human-body safety.Therefore main control module is ignored this low level signal and is not responded, and prevents that main control module from affecting the user to the normal use of electrical equipment to normal residual current misoperation.
Step S302, described main control module receive described high level signal, then control electric loading deenergization.
If the voltage signal that main control module receives is high level signal, residual current then is described more than or equal to preset value, can cause the human electric shock, so main control module is with regard to control electric loading such as compressor, calandria and fan deenergization, with the protection human-body safety.
As seen; the earth leakage protecting method of the present embodiment; by detecting the residual current in the loop; and the fail safe of residual current judged; take again corresponding protection operation; on the one hand prevent electrical leakage and human body is damaged, prevent on the other hand that normal residual current from appearring in the loop and misoperation affect the user to the normal use of electrical equipment, thus safe and reliable.
Referring to earth leakage protecting method the second embodiment of the present invention shown in Figure 4, the step S401 in the present embodiment ~ S406 is same as the previously described embodiments, and difference is to have increased step S407:
Step S407, described main control module produce information warning and control alarm module and show described information warning.
Among this step S407, information warning can be voice messaging, Word message, image information or current signal etc., and alarm module can be man-machine interface, can be voice module, also can be indication lamp module etc.The demonstration of information warning, can be to show that corresponding literal or image are with the reminder alarm user after man-machine interface receives Word message or image information, also can be the voice module receiving speech information and send voice reminder caution user, can also be that indication lamp module received current signal and flashing are with reminder alarm user etc.
Therefore, the earth leakage protecting method of the present embodiment not only can cut off when adventurous residual current with the power supply of electric loading with the protection user security, can also the reminder alarm user, allow the existence of intuitively perception danger of user.
Referring to Fig. 5-earth leakage protective device the first embodiment of the present invention shown in Figure 6, described earth leakage protective device 100 comprises induction module 110, signal processing module 120 and main control module 130.
Induction module 110: the residual current and the delivered current signal that are used for loop inductance.The induction module 110 preferred zero sequence current mutual inductors of the present embodiment, the zero line N and the live wire L that draw from power supply 160 in the loop pass described zero sequence current mutual inductor sense in the same direction, electric current in its loop inductance between zero line N and the live wire L, the electric leakage if the loop is short-circuited, electric current between zero live wire will be uneven, and zero sequence current mutual inductor can be responded to unbalanced electric current, also is residual current, and secondary this current signal is passed to signal processing module 120 by it.
Signal processing module 120: be used for detecting in real time and the received current signal, the residual current in the described current signal and preset value are compared, and pass to main control module 130 after according to comparative result described current signal being converted into corresponding voltage signal.The current value that preset value in the present embodiment is namely preset, common 10 ~ 15mA is lower than the residual current of preset value to human-body safety, can not damage.Specifically, if described residual current, illustrates that this residual current has harm to human body more than or equal to preset value, then this current signal is converted into high level signal and passes to main control module 130; If described residual current, illustrates this residual current less than preset value to human-body safety, then this current signal is converted into low level signal and passes to main control module 130.
Main control module 130: be used for receiving described voltage signal and take corresponding protection operation.The main control module 130 of the present embodiment comprises microprocessor, signal deteching circuit, load driving circuits and on-off controller 131.Wherein signal deteching circuit for detection of and the receiver voltage signal; Load driving circuits is used for driving with electric loading 150 such as runnings such as compressor, fan and calandrias; On-off controller 131 is used for control with the cut-offfing of electric loading 150 power supplys, and it comprises relay and contactor; Microprocessor is communicated with or disconnects the power supply of usefulness electric loading 150 then for the treatment of the signal and control signal testing circuit, load driving circuits and the on-off controller etc. that receive such as control switch controller 131.Concrete, if main control module 130 is received high level signal, residual current then is described more than or equal to preset value, can cause the human electric shock, therefore main control module 130 disconnects with the power supply of electric loading 150 such as compressor, calandria and fan, with the protection human-body safety with regard to control switch controller 131; If main control module 130 is received low level signal, illustrate that then residual current is less than or equal to preset value, to human-body safety, so main control module 130 ignores this low level signal and do not respond, and prevents that main control module 130 from affecting the user to the normal use of electrical equipment to normal residual current misoperation.
As seen; the earth leakage protective device 100 of the present embodiment; by the residual current in the induction module 110 detection loops; and send different voltage signal according to the size of residual current to main control module 130 through signal processing module 120; main control module 130 is taked corresponding protection operation according to different voltage signals; one side prevents electrical leakage and human body is damaged; prevent on the other hand the loop from normal residual current occurring and misoperation affects the user to the normal use of electrical equipment, therefore safe and reliable.
In conjunction with the second embodiment referring to Fig. 6, earth leakage protective device of the present invention shown in Figure 7; the difference of the present embodiment and the first embodiment is to have increased alarm module 140, and this alarm module 140 can be man-machine interface, voice module or indicating lamp module etc.When main control module 130 disconnects with behind the power supply of electric loading 150, can send information warning to alarm module 140, this information warning can be Word message, image information, voice messaging or current signal etc., for example man-machine interface shows that corresponding literal or image are with the reminder alarm user after receiving Word message or image information, perhaps voice module sends voice with the reminder alarm user after receiving voice messaging, and flashing was with the reminder alarm user after perhaps indicating lamp module received current signal.
Thereby the earth leakage protective device 100 of the present embodiment not only can cut off when adventurous residual current with the power supply of electric loading 150 with the protection user security, can also the reminder alarm user, allow the existence of intuitively perception danger of user.
In above-described embodiment, microprocessor, signal deteching circuit, load driving circuits, on-off controller 131, signal processing module 120 and induction module 110 all can highly be integrated on the same printed circuit board (PCB).
Earth leakage protecting method of the present invention and device 100 can be applied to various electrical equipment, and be existing to be applied to water heater as example, and the course of work of earth leakage protective device 100 of the present invention is described:
During the water heater operation, when electric heating body damages rear and water short circuit, have the part electric current and flow into the earth by water; The perhaps Inside coil of compressor and its housing contacts, the Inside coil of fan and its housing contacts have the part electric current and flow into the earth by shell.Said circumstances all can cause passing the current imbalance between the zero live wire of zero sequence current mutual inductor, and zero sequence current mutual inductor can to respond to this unsymmetrical current be residual current, and by its secondary with this current signal transfer to signal processing module 120.Residual current in the signal processing module 120 comparison current signals and the size of preset value, if residual current is less than preset value, signal processing module 120 just is converted into low level signal with current signal, and passing to main control module 130, main control module 130 receives that ignoring this signal behind this low level signal does not respond; When residual current during more than or equal to preset value, signal processing module 120 just is converted into current signal high level signal and passes to main control module 130, the operating electric loading 150 of using of at once control switch controller 131 disconnections was such as compressor, electric heating body or fan deenergization after main control module 130 was received this high level signal, then show information warning at alarm module 140 such as man-machine interface, with the reminder alarm user.Get shocked because of electric heating body, compressor or fan electric leakage thereby avoided the user.
The present invention proposes a kind of water heater simultaneously, and it comprises earth leakage protective device, and described earth leakage protective device comprises induction module, transmission of signal processing module after being used for the residual current of loop inductance and transforming current signal; Signal processing module, for detection of and receive described current signal, the residual current in the described current signal and preset value are compared, and pass to main control module after according to comparative result described current signal being converted into corresponding voltage signal; Main control module is used for receiving described voltage signal and takes corresponding protection operation.Earth leakage protective device described in the present embodiment is the related earth leakage protective device of above-described embodiment among the present invention, does not repeat them here.
Should be understood that; below only be the preferred embodiments of the present invention; can not therefore limit claim of the present invention; every equivalent structure or equivalent flow process conversion that utilizes specification of the present invention and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (10)
1. an earth leakage protecting method is characterized in that, comprising:
Residual current in step S101, the loop inductance also is converted into current signal;
Step S102, the residual current in the described current signal and preset value are compared, and according to comparative result described current signal is converted into corresponding voltage signal;
Step S103, take corresponding protection operation according to described voltage signal.
2. earth leakage protecting method according to claim 1 is characterized in that, described step S102 comprises:
Step S201, the residual current in the described current signal and preset value are compared;
If the described residual current of step S202 then is converted into low level signal with this current signal less than preset value;
If the described residual current of step S203 then is converted into high level signal with this current signal more than or equal to preset value.
3. earth leakage protecting method according to claim 2 is characterized in that, described step S103 comprises:
If step S301 voltage signal is low level signal, then ignores this low level signal and do not respond;
If step S302 voltage signal is high level signal, then controls and use the electric loading deenergization.
4. earth leakage protecting method according to claim 3 is characterized in that, also comprises after the described step S302:
Step S407, generation information warning also show.
5. an earth leakage protective device is characterized in that, comprising:
Induction module passes to signal processing module after being used for the residual current of loop inductance and being converted into current signal;
Signal processing module, for detection of and receive described current signal, the residual current in the described current signal and preset value are compared, and pass to main control module after according to comparative result described current signal being converted into corresponding voltage signal;
Main control module is used for receiving described voltage signal and takes corresponding protection operation.
6. earth leakage protective device according to claim 5, it is characterized in that, after described signal processing module also is used for the residual current of described current signal and preset value compared, if described residual current more than or equal to preset value, then is converted into this current signal high level signal and passes to main control module; If described residual current less than preset value, then is converted into this current signal low level signal and passes to main control module.
7. earth leakage protective device according to claim 6 is characterized in that, described main control module also is used for receiving described high level signal and the electric loading deenergization is used in control, receives described low level signal and ignore this low level signal not respond.
8. earth leakage protective device according to claim 7 is characterized in that, also comprises alarm module, and described main control module produces information warning and controls alarm module and shows described information warning.
9. each described earth leakage protective device is characterized in that according to claim 5-8, and described induction module comprises zero sequence current mutual inductor, and the zero line in the described loop and live wire pass described zero sequence current mutual inductor sense in the same direction.
10. a water heater is characterized in that, comprises each described earth leakage protective device such as claim 5-9.
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| CN201210378324XA CN102904210A (en) | 2012-10-08 | 2012-10-08 | Leakage protection method, leakage protection device and water heater |
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| CN201210378324XA CN102904210A (en) | 2012-10-08 | 2012-10-08 | Leakage protection method, leakage protection device and water heater |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109217236A (en) * | 2017-06-29 | 2019-01-15 | 芜湖美的厨卫电器制造有限公司 | Gas heater and its protective device |
| CN111380229A (en) * | 2020-03-19 | 2020-07-07 | 中山市乐喜电子科技有限公司 | Control method and control device of water heater system |
| WO2021174938A1 (en) * | 2020-03-02 | 2021-09-10 | 青岛经济技术开发区海尔热水器有限公司 | Electrical leakage induction element, electrical leakage detection circuit and water heater |
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| CN109217236A (en) * | 2017-06-29 | 2019-01-15 | 芜湖美的厨卫电器制造有限公司 | Gas heater and its protective device |
| WO2021174938A1 (en) * | 2020-03-02 | 2021-09-10 | 青岛经济技术开发区海尔热水器有限公司 | Electrical leakage induction element, electrical leakage detection circuit and water heater |
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