CN103187706A - Voltage detection leakage protection device for electric water heater - Google Patents
Voltage detection leakage protection device for electric water heater Download PDFInfo
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- CN103187706A CN103187706A CN2011104457510A CN201110445751A CN103187706A CN 103187706 A CN103187706 A CN 103187706A CN 2011104457510 A CN2011104457510 A CN 2011104457510A CN 201110445751 A CN201110445751 A CN 201110445751A CN 103187706 A CN103187706 A CN 103187706A
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Abstract
The invention discloses a voltage detection leakage protection device for an electric water heater, which comprises a main switch, a leakage current mutual inductor, a leakage detection circuit, an optical coupler, a threshold voltage detection circuit, a protective execution circuit and a mechanical release/attracting device, wherein the main switch comprises a live wire switch, a zero wire switch and a ground wire switch respectively; the leakage detection circuit and the protective execution circuit are electrically connected between a live wire and a ground wire respectively; the leakage current mutual inductor detects leakage currents on the live wire and a zero wire, and sends information to the leakage detection circuit; a neon tube of the optical coupler is electrically connected between the zero wire and the ground wire and detects a threshold voltage difference between the zero wire and the ground wire; a photoresistor of the optical coupler is electrically connected with the threshold voltage detection circuit; the leakage detection circuit and the threshold voltage detection circuit send information to the protective execution circuit; and the protective execution circuit controls the mechanical release/attracting device to control turning on and turning off of the main switch. The voltage detection leakage protection device is simple in structure, convenient to use, and high in stability and reliability, and saves a large amount of material cost.
Description
Technical field
The present invention relates to a kind of electric heater voltage detecting type earth leakage protective device, especially relate to a kind of voltage detecting type earth leakage protective device of storage-type electric water heater.
Background technology
Earth leakage protective device on the existing market all adopts the current detection type earth leakage protective device; it is except can realize live wire, zero line to earth loop electric current>5mA the time; outside the cut-out function of realization to power supply and load; in the time of realizing that also live wire and neutral line current reach 30mA; 0.1s it is interior to power supply and load cut-out function; but its loop is the current detection type earth leakage protective device, can't 100% guarantee user's person and property safety.In addition, the current detection type earth leakage protective device mainly contains following shortcoming and can't overcome:
1. national power utilization environment has two kinds, be protective ground and protectiveness connecting to neutral, no matter adopt which kind of connection, socket ground wire and zero line loop voltage be some voltage all, this voltage is objective reality, and GB GB_20044-2005 regulation electrical accessory family expenses and similar applications do not reach 30mA with loop current in the portable residual current device (PRCD) of overcurrent protection the time, 0.1s interior must be to power supply and the mandatory cut-out function of load, and earth resistance is general all less than 0.1 Ω, that is to say that Compulsory Feature ground wire and zero line loop voltage are necessary for 30mA*0.1 Ω=0.001V, and socket ground wire and zero line loop voltage all have certain voltage poor, in fact the different systems electric power system generally has the following voltage of 10V, this voltage is objective reality, this moment, zero line and earth loop electric current were inevitable greater than 30mA, leak to protect must deenergization for current detection type three lines so, make its not deenergization, must make inner container of electric water heater and wall and water pipe circuit do insulation (generally adopting the red blue water pipe head of plastics and inner bag insulation hanger), make ground wire and zero line loop current less than 30mA, reach earth leakage protective device with this and be unlikely to the mistake jumping, avoid influence to use, but be to have promoted E-N socket voltage relatively, generally do not jump voltage by mistake and maintain more than the 64V very that the person reaches 90V, this voltage serious threat to personal safety;
2. connect the red blue water pipe head of plastics at the storage-type electric water heater output and reduce ground wire and zero line loop current to increase water resistance, also will increase the inner inner bag of electric heater and casing insulation device simultaneously, this will consume a large amount of costs;
3. increase the situation that restriction that the inner inner bag of electric heater and casing insulation device have relevant patent now causes the seal exclusive supply, be unfavorable for the development of enterprise.
And can solve as above problem without any a tame enterprise at present, cause enterprise to face being unfavorable for the situation of self-development.
Summary of the invention
In order to overcome above-mentioned defective, the invention provides a kind of electric heater voltage detecting type earth leakage protective device, this voltage detecting type earth leakage protective device is not only simple in structure, easy to use, and the reliability height, saves the lot of materials cost simultaneously.
The present invention for the technical scheme that solves its technical problem and adopt is: a kind of electric heater is with voltage detecting type earth leakage protective device, comprise master switch, leakage current mutual inductor, electric-leakage detection circuit, optical coupler, threshold voltage detection circuit, protection executive circuit and machinery release/adhesive device, described master switch comprises live wire switch, zero line switch and the ground wiretap on the output of being located at live wire, zero line and ground wire respectively; Described electric-leakage detection circuit and protection executive circuit are electrically connected on respectively between live wire and the ground wire; Described leakage current mutual inductor detects the leakage current on described live wire and the zero line and delivers a letter to electric-leakage detection circuit; The neon tube of described photoelectrical coupler is electrically connected between described zero line and the ground wire and detects threshold value pressure reduction between zero line and the ground wire, and the photo resistance of described photoelectrical coupler is electrically connected on described threshold voltage detection circuit; Described electric-leakage detection circuit and threshold voltage detection circuit are messaging in described protection executive circuit respectively, and the described machinery of described protection executive circuit control release/adhesive device is to control the switching of described master switch.During work, the leakage current mutual inductor detects the leakage current on live wire and the zero line and is transferred to electric-leakage detection circuit, electric-leakage detection circuit produces a high level signal and exports to the protection executive circuit, controllable silicon conducting and make solenoid moment adhesive make machinery releases/adhesive device releasing self-locking in the protection executive circuit, namely disconnect master switch, thereby power supply and load are disconnected fully; In like manner; the neon tube of photoelectrical coupler detects the threshold value pressure reduction between zero line and ground wire; when having threshold value pressure reduction between zero line and ground wire; neon tube is luminous; the photo resistance resistance of optical coupler inside reduces, and makes threshold voltage detection circuit output high level signal and is transferred to the protection executive circuit, controllable silicon conducting and make solenoid moment adhesive make machinery releases/adhesive device releasing self-locking in the protection executive circuit; namely disconnect master switch, thereby power supply and load are disconnected fully.
As a further improvement on the present invention, between an end of the neon tube of described photoelectrical coupler and zero line, be connected in series first resistance and second resistance respectively.
As a further improvement on the present invention, described first resistance is identical with the resistance of second resistance, is 10M ohm, power 0.25W.
As a further improvement on the present invention; when arbitrary loop current to ground wire is greater than 5mA in described live wire and the zero line; described electric leakage mutual inductor will be exported induced electromotive force signal and give electric-leakage detection circuit, and electric-leakage detection circuit receives that this signal output high level signal is to the protection executive circuit.
As a further improvement on the present invention, the electromotive force pressure reduction of described ground wire and zero line is during greater than 50V, and described threshold voltage detection circuit output high level signal is given the protection executive circuit.
As a further improvement on the present invention; be in self-locking state under the described machinery release/adhesive device normal condition; described protection executive circuit will make its inner controllable silicon conducting after receiving high level signal, and make machinery releases/adhesive device releasing self-locking and port master switch by solenoid moment.
The invention has the beneficial effects as follows:
When 1. any end of live wire and zero line was to earth loop electric current>5mA, this device property chronologically cut off live wire-zero line (synchronously), ground wire respectively, reaches and cuts off the electricity supply and load;
When 2. ground wire and zero line loop voltage surpassed 50V, this device property chronologically cut off live wire-zero line (synchronously), E respectively, reaches and cuts off the electricity supply and load;
3. in the socket when live wire and N error-polarity connection of power supply, having under the ground wire prerequisite, this device property chronologically cuts off live wire-zero line (synchronously), ground wire respectively, reaches and cuts off the electricity supply and load;
4. storage-type electric water heater internal body inner bag need not and casing insulation, thereby saves the lot of materials cost;
5. storage-type electric water heater cold water input and output end of hot water need not to connect red blue joint, thereby also can save the lot of materials cost;
6. thoroughly overcome the earth leakage protective device mistake jumping problem of zero line/ground line current detection type;
7. thoroughly avoided the restricted problem of collets patent.
Description of drawings
Fig. 1 is structural principle schematic diagram of the present invention.
Embodiment
A kind of electric heater voltage detecting type earth leakage protective device, comprise master switch K, leakage current mutual inductor 1, electric-leakage detection circuit 2, optical coupler 3, threshold voltage detection circuit 4, protection executive circuit 5 and machinery release/adhesive device 6, described master switch comprises live wire switch, zero line switch and the ground wiretap on the output of being located at live wire L, zero line N and ground wire E respectively; Described electric-leakage detection circuit and protection executive circuit are electrically connected on respectively between live wire and the ground wire; Described leakage current mutual inductor detects the leakage current on described live wire and the zero line and delivers a letter to electric-leakage detection circuit; The neon tube RG of described photoelectrical coupler is electrically connected between described zero line and the ground wire and detects threshold value pressure reduction between zero line and the ground wire, and the photo resistance RT of described photoelectrical coupler is electrically connected on described threshold voltage detection circuit; Described electric-leakage detection circuit and threshold voltage detection circuit are messaging in described protection executive circuit respectively, and the described machinery of described protection executive circuit control release/adhesive device is to control the switching of described master switch.During work, the leakage current mutual inductor detects the leakage current on live wire and the zero line and is transferred to electric-leakage detection circuit, electric-leakage detection circuit produces a high level signal and exports to the protection executive circuit, controllable silicon conducting and make solenoid moment adhesive make machinery releases/adhesive device releasing self-locking in the protection executive circuit, namely disconnect master switch, thereby power supply and load are disconnected fully; In like manner; the neon tube of photoelectrical coupler detects the threshold value pressure reduction between zero line and ground wire; when having threshold value pressure reduction between zero line and ground wire; neon tube is luminous; the photo resistance resistance of optical coupler inside reduces, and makes threshold voltage detection circuit output high level signal and is transferred to the protection executive circuit, controllable silicon conducting and make solenoid moment adhesive make machinery releases/adhesive device releasing self-locking in the protection executive circuit; namely disconnect master switch, thereby power supply and load are disconnected fully.
Preferably, between an end of the neon tube of the above photoelectrical coupler and zero line, be connected in series first resistance R 1 and second resistance R 2 respectively.
Preferably, above-mentioned first resistance is identical with the resistance of second resistance, is 10M ohm, power 0.25W.
Preferably, when arbitrary loop current to ground wire is greater than 5mA in above-mentioned live wire and the zero line, described electric leakage mutual inductor will be exported induced electromotive force signal and give electric-leakage detection circuit, and electric-leakage detection circuit receives that this signal output high level signal gives the protection executive circuit.
Preferably, the electromotive force pressure reduction of above-mentioned ground wire and zero line is during greater than 50V, and described threshold voltage detection circuit output high level signal is given the protection executive circuit.
Preferably; be in self-locking state under the above-mentioned machinery release/adhesive device normal condition; described protection executive circuit will make its inner controllable silicon conducting after receiving high level signal, and make machinery releases/adhesive device releasing self-locking and port master switch by solenoid moment.
Claims (6)
1. an electric heater is with voltage detecting type earth leakage protective device, it is characterized in that: it comprises master switch (K), leakage current mutual inductor (1), electric-leakage detection circuit (2), optical coupler (3), threshold voltage detection circuit (4), protection executive circuit (5) and machinery release/adhesive device (6), and described master switch comprises live wire switch, zero line switch and the ground wiretap on the output of being located at live wire (L), zero line (N) and ground wire (E) respectively; Described electric-leakage detection circuit and protection executive circuit are electrically connected on respectively between live wire and the ground wire; Described leakage current mutual inductor detects the leakage current on described live wire and the zero line and delivers a letter to electric-leakage detection circuit; The neon tube of described photoelectrical coupler (RG) is electrically connected between described zero line and the ground wire and detects threshold value pressure reduction between zero line and the ground wire, and the photo resistance of described photoelectrical coupler (RT) is electrically connected on described threshold voltage detection circuit; Described electric-leakage detection circuit and threshold voltage detection circuit are messaging in described protection executive circuit respectively, and the described machinery of described protection executive circuit control release/adhesive device is to control the switching of described master switch.
2. electric heater according to claim 1 is characterized in that with voltage detecting type earth leakage protective device: be connected in series first resistance (R1) and second resistance (R2) respectively between an end of the neon tube of described photoelectrical coupler and zero line.
3. electric heater according to claim 2 is with voltage detecting type earth leakage protective device, and it is characterized in that: described first resistance is identical with the resistance of second resistance, is 10M ohm, power 0.25W.
4. electric heater according to claim 1 is with voltage detecting type earth leakage protective device; it is characterized in that: when arbitrary loop current to ground wire is greater than 5mA in described live wire and the zero line; described electric leakage mutual inductor will be exported induced electromotive force signal and give electric-leakage detection circuit, and electric-leakage detection circuit receives that this signal output high level signal is to the protection executive circuit.
5. electric heater according to claim 1 is characterized in that with voltage detecting type earth leakage protective device: the electromotive force pressure reduction of described ground wire and zero line is during greater than 50V, and described threshold voltage detection circuit output high level signal is given the protection executive circuit.
6. according to claim 4 or 5 described electric heaters voltage detecting type earth leakage protective device; it is characterized in that: be in self-locking state under the described machinery release/adhesive device normal condition; described protection executive circuit will make its inner controllable silicon conducting after receiving high level signal, and make machinery releases/adhesive device releasing self-locking and port master switch by solenoid moment.
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CN201110445751.0A CN103187706B (en) | 2011-12-28 | 2011-12-28 | Electrical water heater electric is pressed detection type earth leakage protective device |
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CN201110445751.0A CN103187706B (en) | 2011-12-28 | 2011-12-28 | Electrical water heater electric is pressed detection type earth leakage protective device |
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CN103187706A true CN103187706A (en) | 2013-07-03 |
CN103187706B CN103187706B (en) | 2016-05-11 |
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Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104201648A (en) * | 2014-09-15 | 2014-12-10 | 福建通用同溢电气有限公司 | New distribution connection method and device |
CN104734114A (en) * | 2015-02-25 | 2015-06-24 | 余姚市嘉荣电子电器有限公司 | Optocoupling detection ground wire voltage abnormity and earth leakage protection device |
CN105972832A (en) * | 2016-07-05 | 2016-09-28 | 广东万家乐燃气具有限公司 | Electric water heater water output power-off control system capable of preventing misoperation |
CN106322767A (en) * | 2015-06-23 | 2017-01-11 | 青岛经济技术开发区海尔热水器有限公司 | Electric water heater and control method |
CN106602500A (en) * | 2017-01-04 | 2017-04-26 | 郝珊 | Novel protection grounding live-line alarm and protection circuit |
CN107017603A (en) * | 2017-03-10 | 2017-08-04 | 浙江工商职业技术学院 | Smart grounding protection device and its control method |
CN108565830A (en) * | 2018-07-09 | 2018-09-21 | 相变能源科技(青岛)有限公司 | Active multifunctional electric leakage protector |
CN108963671A (en) * | 2018-07-09 | 2018-12-07 | 相变能源科技(青岛)有限公司 | It is a kind of to prevent attaching plug on fire |
CN109103844A (en) * | 2018-09-27 | 2018-12-28 | 奥普家居股份有限公司 | Super bath controller with earth leakage protective device |
CN111486599A (en) * | 2020-03-20 | 2020-08-04 | 广东万家乐燃气具有限公司 | Electric water heater electric leakage detection system and electric water heater |
CN112509739A (en) * | 2020-12-02 | 2021-03-16 | 中申(宁波)电力科技有限公司 | Explosion-proof cable, explosion-proof cable leakage detection device and method and power supply circuit |
CN117543503A (en) * | 2023-11-13 | 2024-02-09 | 重庆电道智能科技有限公司 | Leakage protector |
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Cited By (17)
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CN104201648A (en) * | 2014-09-15 | 2014-12-10 | 福建通用同溢电气有限公司 | New distribution connection method and device |
CN104734114A (en) * | 2015-02-25 | 2015-06-24 | 余姚市嘉荣电子电器有限公司 | Optocoupling detection ground wire voltage abnormity and earth leakage protection device |
CN106322767A (en) * | 2015-06-23 | 2017-01-11 | 青岛经济技术开发区海尔热水器有限公司 | Electric water heater and control method |
CN106322767B (en) * | 2015-06-23 | 2019-11-05 | 青岛经济技术开发区海尔热水器有限公司 | Electric water heater and control method |
CN105972832B (en) * | 2016-07-05 | 2021-12-31 | 广东万家乐燃气具有限公司 | Electric water heater water outlet power-off control system capable of preventing misoperation |
CN105972832A (en) * | 2016-07-05 | 2016-09-28 | 广东万家乐燃气具有限公司 | Electric water heater water output power-off control system capable of preventing misoperation |
CN106602500A (en) * | 2017-01-04 | 2017-04-26 | 郝珊 | Novel protection grounding live-line alarm and protection circuit |
CN107017603A (en) * | 2017-03-10 | 2017-08-04 | 浙江工商职业技术学院 | Smart grounding protection device and its control method |
CN107017603B (en) * | 2017-03-10 | 2020-02-21 | 浙江工商职业技术学院 | Intelligent grounding protection device and control method thereof |
CN108565830A (en) * | 2018-07-09 | 2018-09-21 | 相变能源科技(青岛)有限公司 | Active multifunctional electric leakage protector |
CN108963671A (en) * | 2018-07-09 | 2018-12-07 | 相变能源科技(青岛)有限公司 | It is a kind of to prevent attaching plug on fire |
CN109103844A (en) * | 2018-09-27 | 2018-12-28 | 奥普家居股份有限公司 | Super bath controller with earth leakage protective device |
CN111486599B (en) * | 2020-03-20 | 2021-05-14 | 广东万家乐燃气具有限公司 | Electric water heater electric leakage detection system and electric water heater |
CN111486599A (en) * | 2020-03-20 | 2020-08-04 | 广东万家乐燃气具有限公司 | Electric water heater electric leakage detection system and electric water heater |
CN112509739A (en) * | 2020-12-02 | 2021-03-16 | 中申(宁波)电力科技有限公司 | Explosion-proof cable, explosion-proof cable leakage detection device and method and power supply circuit |
CN117543503A (en) * | 2023-11-13 | 2024-02-09 | 重庆电道智能科技有限公司 | Leakage protector |
CN117543503B (en) * | 2023-11-13 | 2024-05-24 | 重庆电道智能科技有限公司 | Leakage protector |
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