CN101593962A - Anti-electric shock device for household appliance - Google Patents
Anti-electric shock device for household appliance Download PDFInfo
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- CN101593962A CN101593962A CNA2009100204455A CN200910020445A CN101593962A CN 101593962 A CN101593962 A CN 101593962A CN A2009100204455 A CNA2009100204455 A CN A2009100204455A CN 200910020445 A CN200910020445 A CN 200910020445A CN 101593962 A CN101593962 A CN 101593962A
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- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 206010014357 Electric shock Diseases 0.000 description 17
- 230000005611 electricity Effects 0.000 description 9
- 230000001681 protective effect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 241001494479 Pecora Species 0.000 description 1
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Abstract
The invention discloses a kind of anti-electric shock device for household appliance.It comprises: testing circuit is used to detect the voltage between electrical equipment earth terminal and its zero-power line; Switching circuit according to above-mentioned magnitude of voltage and set point relatively, and moves during greater than set point at above-mentioned magnitude of voltage; Controller is accepted the said switching circuit signal; And, provide sound, light and/or electric alarm according to the next warning circuit of the described controller of above-mentioned signal controlling; And executive circuit, be used to cut off the power supply that inserts household electrical appliance, and time-delay disconnects ground wire.The invention provides a kind of household electrical appliance that not only can effectively detect and whether have dangerous voltage, and can report to the police, and above-mentioned dangerous voltage is carried out the anti-electric shock device for household appliance of harmless treatment.
Description
(1) technical field
The present invention relates to a kind of anti-electric shock device for household appliance, especially relate to a kind of anti-electric shock apparatus that detects and handle household electrical appliance ground wire electrification and/or household electrical appliance device electric leakage itself, belong to the safety technique for using electricity field.
(2) background technology
Consider the Electrical Safety of household electrical appliance, GB Committee revised GB4706 " safety requirements of the electrical equipment of family expenses and similar applications " in 2006, especially lack of standardization and cause the present situation of electricity consumption danger easily at the China's national situation power utilization environment, in appendix A A, clearly add: when using electric heater, ground wire unusual (comprise that the ground wire contact is bad or do not connect and ground wire electrification) occurs, should pipe and report to the police to cutting off the electricity supply.
Yet, also there is not the ripe household electronic products that meets national standard in the market, certainly, those skilled in the art also compares useful exploration in this field.No. 2007100278229 application for a patent for invention of China Intellectual Property Office discloses and a kind ofly the device of indication of reporting to the police occurred can sending when unusual in grounding system, this device is connected to warning circuit between the zero utmost point of power input and earth polar, between the phase utmost point of power input and earth polar, be connected to current-limiting resistance, its principle is when grounding system electric wire disappearance, the phase utmost point, current-limiting resistance, warning circuit, zero line series connection have formed a complete warning circuit, send the indication of reporting to the police; When the ground wire electrification of grounding system, charged ground wire, warning circuit have also formed the alarm circuit that becomes complete with the zero line series connection, sending the indication of reporting to the police.But, in case ground wire is scurried into high pressure, or even electric consumption on lighting voltage, said warning circuit self does not have protective device, may burn moment, does not have protective effect at all.In addition, because it is not cut off the electricity supply and the device of ground wire automatically, that is to say and artificially to cut off the electricity supply and ground wire, if simple cuts off the electricity supply, can not prevent that ground wire from scurrying into the danger of high-tension electricity, ground wire setting at present all fixedly installs in addition, and it is also very inconvenient to think directly to cut off ground wire.
In addition,, comprise that the household electrical appliance of electric heater mostly adopt traditional creepage protection function on the market now, just utilize the automatically-unhooked function of earth leakage protective device to realize the disconnection of power supply in order to cut off the electricity supply automatically.On the other hand, creepage protection function only just can work after Danger Electric shock risk takes place, and that is to say that the user still has Danger Electric shock risk, though be unlikely to fatal, can exert an influence to user psychology.The dangerous voltage processing mode of the parts such as casing for electric appliances of Cai Yonging all is based on the earth leakage protective principle basically in the market, and No. 011298677 patent of invention of China Intellectual Property Office and No. 200710027575 application for a patent for invention are the device with typical creepage protection function.
(3) summary of the invention
Therefore, goal of the invention of the present invention provides a kind of household electrical appliance that not only can effectively detect and whether has dangerous voltage, and can report to the police, and above-mentioned dangerous voltage is carried out the anti-electric shock device for household appliance of harmless treatment.
In order to realize goal of the invention of the present invention, the present invention by the following technical solutions:
This invention anti-electric shock device for household appliance, it comprises:
Testing circuit is used to detect the voltage between electrical equipment earth terminal and its zero-power line;
Switching circuit according to above-mentioned magnitude of voltage and set point relatively, and moves during greater than set point at above-mentioned magnitude of voltage;
Controller is accepted the said switching circuit signal; And it is the next according to the described controller of above-mentioned signal controlling
Warning circuit provides sound, light and/or electric alarm; With
Executive circuit be used to cut off the power supply that inserts household electrical appliance, and time-delay disconnects ground wire.
According to technical scheme of the present invention as can be known, if have dangerous voltage on the household electrical appliance, warning not only can be provided, can also cut off the power supply of household electrical appliance fast, and time-delay disconnects ground wire, thereby, not only can dispose the danger that the electric leakage of its power supply is brought, can prevent effectively also that ground wire from scurrying into high pressure and the danger that brings.On the other hand, because time-delay disconnects ground wire, one, if said dangerous voltage is not that ground wire is scurried into, time-delay disconnects and then can will release such as the electric weight on the household appliances shell so; Its two, can also be in view of the above household electrical appliance be done further to analyze, judgement is the power supply electric leakage, or ground wire is scurried into easy access.
In addition; because this programme is different from the existing electrical leakage protection means of line correlation operation of going forward side by side of only just can reporting to the police fully under the situation that the people gets an electric shock; as long as there is the source of clearing at once in dangerous voltage on the household electrical appliance; fundamentally remove Danger Electric shock risk; if existing scheme is to mend the fold after the sheep is lost, this programme is then provided for a rainy day.
In addition, connect anti-situation for phase, zero line, just said zero line becomes live wire, can also trigger described switching circuit, thereby can effectively prevent the generation of electric shock accidents.
Above-mentioned anti-electric shock device for household appliance, described controller is connected to a reset circuit, is used for resetting of described household electrical appliance power supply and ground wire.Described reset circuit comprises the hand switch SW that joins by a forward biased diode D3 and described controller one input terminal.
Described testing circuit comprises resistance R 1, capacitor C 2, the resistance R 2 that anode tap is connected to the diode D1 of electrical equipment earth terminal and is connected in series successively, and negative electrode is connected to diode D2 between zero-power line, wherein capacitor C 2 is in parallel with the diode of a photoelectrical coupler, and the emitter of the triode of corresponding photoelectrical coupler links to each other with controller one input.
The another kind of scheme of described testing circuit is that it comprises resistance R 1, capacitor C 2, resistance R 2 that anode tap is connected to the diode D1 of electrical equipment earth terminal and is connected in series successively, and negative electrode is connected to diode D2 between zero-power line, wherein capacitor C 2 resistance R 5 in parallel, and both a back resistance R 6 ground connection of passing through in parallel; Described switching circuit comprises that inverting input is connected between resistance R 5, R6, and in-phase input end is connected to 5 of resistance R 1 and resistance R, and output is connected to the comparator of controller one input terminal.
Above-mentioned anti-electric shock device for household appliance, described resistance R 1 is parallel with a capacitor C 1.
Above-mentioned anti-electric shock device for household appliance, described executive circuit comprise by relay control be used to cut off or the power supply and the switch that is connected ground wire of closed household electrical appliance.
Above-mentioned anti-electric shock device for household appliance, described be used to cut off or closed household electrical appliance power supply and the switch that is connected ground wire for controlling the change over switch of power supply phase, zero-sum ground wire respectively, when described executive circuit action is finished, another of corresponding conversion switch is to loop between contact formation ground wire and zero line and the loop between phase line and zero line, the indicator light that said loop is provided with current-limiting resistance and is used to indicate related circuit to disconnect.
(4) description of drawings
The invention will be further elaborated below in conjunction with Figure of description, makes those skilled in the art better understand the present invention, wherein:
Fig. 1 is the theory diagram of embodiment of the invention anti-electric shock device for household appliance.
Fig. 2 is a kind of electrical schematic of embodiment of the invention anti-electric shock device for household appliance.
Fig. 3 is the another kind of electrical schematic of embodiment of the invention anti-electric shock device for household appliance.
(5) embodiment
With reference to Figure of description 1 and 3, one embodiment of the present of invention are that it comprises:
Testing circuit is used to detect the voltage between electrical equipment earth terminal and its zero-power line;
Switching circuit according to above-mentioned magnitude of voltage and set point relatively, and moves during greater than set point at above-mentioned magnitude of voltage;
Controller is accepted the said switching circuit signal; And it is the next according to the described controller of above-mentioned signal controlling
Warning circuit provides sound, light and/or electric alarm; With
Executive circuit be used to cut off the power supply that inserts household electrical appliance, and time-delay disconnects ground wire.
Consider that from controlling saying of controller broad sense comprises that they have input/output function, can control industry spot easily such as core logic control devices such as Industrial Control Computer, PLC, single-chip microcomputers.
Further, described controller is connected to a reset circuit, is used for resetting of described household electrical appliance power supply and ground wire, makes things convenient for resetting after the maintenance of system to power on.
Wherein said reset circuit comprises the hand switch SW that joins by a forward biased diode D3 and described controller one input terminal.Nature, said resetting is nothing but to pulse signal of controller, so it is not limited to adopt the scheme of above-mentioned hand switch, can adopt other other schemes that can give a pulse of controller.
An embodiment as this programme, described testing circuit comprises resistance R 1, capacitor C 2, the resistance R 2 that anode tap is connected to the diode D1 of electrical equipment earth terminal and is connected in series successively, and negative electrode is connected to diode D2 between zero-power line, wherein capacitor C 2 is in parallel with the diode of a photoelectrical coupler, and the emitter of the triode of corresponding photoelectrical coupler links to each other with controller one input.Size by adjusting resistance R 1 and resistance R 2 is configuration switch voltage easily, adopts photoelectrical coupler can prevent effectively that then high-tension electricity may be to the infringement of core processing device.
With reference to Figure of description 2, another embodiment of this programme is that described testing circuit comprises resistance R 1, capacitor C 2, the resistance R 2 that anode tap is connected to the diode D1 of electrical equipment earth terminal and is connected in series successively, and negative electrode is connected to diode D2 between zero-power line, wherein capacitor C 2 resistance R 5 in parallel, and both a back resistance R 6 ground connection of passing through in parallel; Described switching circuit comprises that inverting input is connected between resistance R 5, R6, and in-phase input end is connected to 5 of resistance R 1 and resistance R, and output is connected to the comparator of controller one input terminal.This scheme can accurately be controlled the comparator reversal voltage, is convenient to set reversal voltage.
Described resistance R 1 is parallel with a capacitor C 1, to improve the voltage signal response speed.
Described executive circuit comprise by relay control be used to cut off or the power supply and the switch that is connected ground wire of closed household electrical appliance, be convenient to Long-distance Control.
Described be used to cut off or closed household electrical appliance power supply and the switch that is connected ground wire for controlling the change over switch of power supply phase, zero-sum ground wire respectively, when described executive circuit action is finished, another of corresponding conversion switch is to loop between contact formation ground wire and zero line and the loop between phase line and zero line, the indicator light that said loop is provided with current-limiting resistance and is used to indicate related circuit to disconnect.Be used for the state indication that corresponding circuits disconnects, wherein above-mentioned two loops are independent separately, especially can clearly indicate when ground wire electrification, are convenient to postorder overhaul procedure ground and carry out.
Claims (8)
1. anti-electric shock device for household appliance, it comprises:
Testing circuit is used to detect the voltage between electrical equipment earth terminal and its zero-power line;
Switching circuit according to above-mentioned magnitude of voltage and set point relatively, and moves during greater than set point at above-mentioned magnitude of voltage;
Controller is accepted the said switching circuit signal; And it is the next according to the described controller of above-mentioned signal controlling
Warning circuit provides sound, light and/or electric alarm; With
Executive circuit be used to cut off the power supply that inserts household electrical appliance, and time-delay disconnects ground wire.
2. anti-electric shock device for household appliance according to claim 1 is characterized in that: described controller is connected to a reset circuit, is used for resetting of described household electrical appliance power supply and ground wire.
3. anti-electric shock device for household appliance according to claim 2 is characterized in that: described reset circuit comprises the hand switch SW that joins by a forward biased diode D3 and described controller one input terminal.
4. anti-electric shock device for household appliance according to claim 1, it is characterized in that: described testing circuit comprises resistance R 1, capacitor C 2, the resistance R 2 that anode tap is connected to the diode D1 of electrical equipment earth terminal and is connected in series successively, and negative electrode is connected to diode D2 between zero-power line, wherein capacitor C 2 is in parallel with the diode of a photoelectrical coupler, and the emitter of the triode of corresponding photoelectrical coupler links to each other with controller one input.
5. anti-electric shock device for household appliance according to claim 1, it is characterized in that: described testing circuit comprises resistance R 1, capacitor C 2, the resistance R 2 that anode tap is connected to the diode D1 of electrical equipment earth terminal and is connected in series successively, and negative electrode is connected to diode D2 between zero-power line, wherein capacitor C 2 resistance R 5 in parallel, and both a back resistance R 6 ground connection of passing through in parallel; Described switching circuit comprises that inverting input is connected between resistance R 5, R6, and in-phase input end is connected to 5 of resistance R 1 and resistance R, and output is connected to the comparator of controller one input terminal.
6. according to requiring 4 or 5 described anti-electric shock device for household appliance entirely, it is characterized in that: described resistance R 1 is parallel with a capacitor C 1.
7. according to the described anti-electric shock device for household appliance of one of claim 1 to 5, it is characterized in that: described executive circuit comprise by relay control be used to cut off or the power supply and the switch that is connected ground wire of closed household electrical appliance.
8. anti-electric shock device for household appliance according to claim 7, it is characterized in that: described be used to cut off or closed household electrical appliance power supply and the switch that is connected ground wire for controlling the change over switch of power supply phase, zero-sum ground wire respectively, when described executive circuit action is finished, another of corresponding conversion switch is to loop between contact formation ground wire and zero line and the loop between phase line and zero line, the indicator light that said loop is provided with current-limiting resistance and is used to indicate related circuit to disconnect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100204455A CN101593962B (en) | 2009-04-09 | 2009-04-09 | Anti-electric shock device for household appliance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100204455A CN101593962B (en) | 2009-04-09 | 2009-04-09 | Anti-electric shock device for household appliance |
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| Publication Number | Publication Date |
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| CN101593962A true CN101593962A (en) | 2009-12-02 |
| CN101593962B CN101593962B (en) | 2011-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009100204455A Expired - Fee Related CN101593962B (en) | 2009-04-09 | 2009-04-09 | Anti-electric shock device for household appliance |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107084511A (en) * | 2017-06-21 | 2017-08-22 | 广东美的暖通设备有限公司 | Method and apparatus, air-conditioning for instructing operating air conditioner |
| CN108397758A (en) * | 2018-03-27 | 2018-08-14 | 江苏赛博宇华科技有限公司 | A kind of Internet of Things room lighting control device |
| CN112834950A (en) * | 2020-09-07 | 2021-05-25 | 青岛经济技术开发区海尔热水器有限公司 | Electric leakage detection circuit, electric leakage protection circuit and household appliance |
-
2009
- 2009-04-09 CN CN2009100204455A patent/CN101593962B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107084511A (en) * | 2017-06-21 | 2017-08-22 | 广东美的暖通设备有限公司 | Method and apparatus, air-conditioning for instructing operating air conditioner |
| CN107084511B (en) * | 2017-06-21 | 2019-09-06 | 广东美的暖通设备有限公司 | For instructing method and apparatus, the air-conditioning of operating air conditioner |
| CN108397758A (en) * | 2018-03-27 | 2018-08-14 | 江苏赛博宇华科技有限公司 | A kind of Internet of Things room lighting control device |
| CN112834950A (en) * | 2020-09-07 | 2021-05-25 | 青岛经济技术开发区海尔热水器有限公司 | Electric leakage detection circuit, electric leakage protection circuit and household appliance |
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| CN101593962B (en) | 2011-11-23 |
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