CN105116205A - Apparatus detecting whether casing of home appliance is electrified or not - Google Patents

Apparatus detecting whether casing of home appliance is electrified or not Download PDF

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Publication number
CN105116205A
CN105116205A CN201510455636.XA CN201510455636A CN105116205A CN 105116205 A CN105116205 A CN 105116205A CN 201510455636 A CN201510455636 A CN 201510455636A CN 105116205 A CN105116205 A CN 105116205A
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China
Prior art keywords
voltage
charged
casing
voltage difference
electric appliance
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CN201510455636.XA
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Chinese (zh)
Inventor
麻文山
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Qingdao Haier Technology Co Ltd
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Qingdao Haier Technology Co Ltd
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Priority to CN201510455636.XA priority Critical patent/CN105116205A/en
Publication of CN105116205A publication Critical patent/CN105116205A/en
Pending legal-status Critical Current

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Abstract

The invention discloses an apparatus detecting whether a casing of a home appliance is electrified or not. The apparatus comprises a voltage difference detecting signal generating unit used for generating a voltage difference detecting signal according to the voltage difference between the home appliance casing and home appliance N wires; and a control unit connected with the voltage difference detecting signal generating unit and used for judging whether the home appliance casing is electrified or not according to the voltage difference detecting signal and alarming if the casing is electrified. The apparatus detecting whether the casing of the home appliance is electrified or not can detect whether the home appliance of a user undergoes electric leakage and consequently the casing is electrified. The apparatus further alarms in advance and reminds the user to be cautious if the casing is detected to be electrified. The apparatus which adopts no current transformers has the characteristics of low cost, easy production, high reliability, and no interference from static and induced electricity.

Description

The pick-up unit that a kind of Household electric appliance casing is charged
Technical field
The present invention relates to grounding technology field, particularly relate to the pick-up unit that a kind of Household electric appliance casing is charged.
Background technology
The electrical equipment used in current user family, if water heater, refrigerator, washing machine etc. are all standard three-prong plugs, and the earth terminal above plug is all be connected with appliance shell, for the protection of ground connection.But the ground wire of the Three-hole socket in some user families may not connect; if the water heater heating core breakage of user family causes inner bag charged; or washing machine leaks and causes casing charged; or the electric leakage of other household electrical appliances causes casing charged; now earth leakage protective device cannot detect electric current; can not trip, if people touches casing can cause electric shock accidents, the personal safety of user cannot be protected.
The corresponding safeguard measure that current most of household electrical appliances self on the market all do not have is all rely on the earth leakage protective device in user family.Indivedual household electrical appliances have corresponding earth leakage protection measure, are generally make Current Transformer to detect and amplify leakage current.When occurring when leaking electricity, current transformer produces change in voltage, detects this change in voltage, perform power-off protection or other actions by pick-up unit.
Inventor finds when realizing of the present invention, and existing technology has following shortcoming:
If the ground wire of the Three-hole socket of user's family does not connect, or does not fill earth leakage protective device in some rural areas, when family's motor casing is charged, cannot form leakage current or leakage current is very little, pick-up unit cannot be made to detect, and now casing is charged.If user touches casing with health, can electric shock accidents be caused, therefore the personal safety of user cannot be protected.
Two, the earth leakage protection measure of indivedual household electrical appliances use at present, principle is the same with earth leakage protective device, is just to protect when leaking electricity and occurring, instead of prevents in advance or give warning in advance, can not 100% protection personal safety.
Three, whether some electric heaters use neon lamp to carry out early warning casing and leak electricity, but neon lamp only needs very little electric current will be bright, so some electrostatic and induced electricity can cause machine false alarm.
Four, make the leakage protective scheme of Current Transformer, cost is higher.
Summary of the invention
The technical problem to be solved in the present invention is to provide the charged pick-up unit of a kind of Household electric appliance casing, in order to solve the easy false alarm of prior art earth leakage protective device, problem that cost is high.
For solving the problems of the technologies described above, the invention provides the pick-up unit that a kind of Household electric appliance casing is charged, described device comprises:
Voltage difference detection signal generation unit, for the voltage difference according to Household electric appliance casing and household electrical appliance N line, formation voltage difference detection signal;
Control module, being connected with described voltage difference detection signal generation unit, for judging that whether described Household electric appliance casing is charged according to described voltage difference detection signal, reporting to the police when casing is charged.
Further, described voltage difference detection signal generation unit comprises:
Forceful electric power input subelement, for the voltage difference according to Household electric appliance casing and household electrical appliance N line, generates comparison signal;
Forceful electric power signal transacting subelement, being connected with described forceful electric power input subelement, for being processed by described comparison signal, obtaining voltage difference detection signal;
Non-isolated power supply, the medium voltage based on L line and N line generates direct supply, powers for giving described forceful electric power input subelement and forceful electric power signal transacting subelement.
Further, described non-isolated power supply comprises the bleeder circuit, rectification circuit, filtering circuit, output voltage smoothing circuit and the mu balanced circuit that connect successively; Wherein, described bleeder circuit is used for carrying out dividing potential drop to the voltage between the L line of Domestic electric appliances power source and N line, comprise the first electric capacity and the second electric capacity, described first electric capacity is connected with L line and N line respectively with one end of the second electric capacity, and the other end is connected respectively to two input ends of described rectification circuit.
Further, described non-isolated power supply also comprises the first switch, and described first switch series is associated between N line and the second electric capacity.
Further, described forceful electric power input subelement comprises the first diode, the first current-limiting resistance, the second current-limiting resistance, the 3rd current-limiting resistance and the second diode; The positive pole of Household electric appliance casing, the first diode, the negative pole of the first diode, the first current-limiting resistance, the second current-limiting resistance, the 3rd current-limiting resistance, the positive pole of the second diode, the negative pole of the second diode are connected successively with household electrical appliance N line, and the voltage signal that described second current-limiting resistance two ends produce is described comparison signal.
Further, described forceful electric power input subelement also comprises second switch, and described second switch is connected between the positive pole of Household electric appliance casing and the first diode.
Further, described forceful electric power signal transacting subelement comprises:
Operation amplifier circuit, for being amplified by described comparison signal, obtains a sinusoidal voltage;
First voltage comparator circuit, for described sinusoidal voltage and the first DC voltage pre-set being compared, obtains the square wave of certain dutycycle;
Integrating circuit, for carrying out integration to described square wave, obtains a smooth dc voltage;
Second voltage comparator circuit, for described smooth dc voltage and the second DC voltage pre-set being compared, obtains voltage difference detection signal.
Further, described control module comprises:
Detection sub-unit, for receiving and detecting voltage difference detection signal; When detect within the time preset have voltage difference detection signal to input always time, judge that described Household electric appliance casing is charged; When not detecting that voltage difference detection signal inputs, judge that described Household electric appliance casing is not charged;
Alarm part-unit, for reporting to the police when described Household electric appliance casing is charged.
Further, described warning comprises pilot lamp warning and/or audible alarm.
Further, described device also comprises isolated location, is connected respectively with described voltage difference detection signal generation unit and control module, for carrying out confession electric isolution to described voltage difference detection signal generation unit and control module.
Beneficial effect of the present invention is as follows:
Whether the household electrical appliances that the charged pick-up unit of Household electric appliance casing of the present invention can detect user leak electricity and cause casing charged, if when finding that casing is charged, can report to the police in advance and point out user to note.The present invention does not make Current Transformer, and cost is low, is easy to produce, and reliability is high, can not be subject to electrostatic, faradic interference.
Accompanying drawing explanation
Fig. 1 is the structural representation of the charged pick-up unit of a kind of Household electric appliance casing of the embodiment of the present invention;
Fig. 2 is the circuit structure diagram of the non-isolated power supply of the embodiment of the present invention;
Fig. 3 is the circuit structure diagram of the forceful electric power input subelement of the embodiment of the present invention, forceful electric power signal transacting subelement and isolated location;
Fig. 4 a be the embodiment of the present invention work as Household electric appliance casing charged time, the sinusoidal voltage after comparison signal amplifies and compare the oscillogram of the square wave after output;
Fig. 4 b be the embodiment of the present invention work as Household electric appliance casing charged time, the smooth dc voltage obtained after integration is carried out to square wave and the oscillogram of voltage difference detection signal;
Fig. 5 is the LED drive circuit figure of the embodiment of the present invention;
Fig. 6 is the buzzer drive circuit figure of the embodiment of the present invention;
Fig. 7 is the ground detection device of the embodiment of the present invention and the wiring diagram of household electrical appliance.
Embodiment
In order to solve the easy false alarm of prior art earth leakage protective device, problem that cost is high, the invention provides the pick-up unit that a kind of Household electric appliance casing is charged, below in conjunction with accompanying drawing and embodiment, the present invention being further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, do not limit the present invention.
The charged pick-up unit of a kind of Household electric appliance casing of the embodiment of the present invention as shown in Figure 1, comprise voltage difference detection signal generation unit 1, isolated location 2 and control module 3, wherein isolated location 2 is connected with described voltage difference detection signal generation unit 1 and control module 3 respectively.
Voltage difference detection signal generation unit 1 for the voltage difference according to Household electric appliance casing and household electrical appliance N line, formation voltage difference detection signal.Described voltage difference detection signal generation unit comprises non-isolated power supply 11, forceful electric power input subelement 12 and forceful electric power signal transacting subelement 13.Wherein, forceful electric power signal transacting subelement 13 is connected with described forceful electric power input subelement 12, and described non-isolated power supply 11 is connected with described forceful electric power input subelement 12 and forceful electric power signal transacting subelement 13 respectively.
Non-isolated power supply 11 generates direct supply based on the medium voltage of L line and N line, powers for giving described forceful electric power input subelement 12 and forceful electric power signal transacting subelement 13; Forceful electric power input subelement 12, for the voltage difference according to Household electric appliance casing and household electrical appliance N line, generates comparison signal; Forceful electric power signal transacting subelement 13, for being processed by described comparison signal, obtains voltage difference detection signal.
The circuit structure of described non-isolated power supply 11 as shown in Figure 2, comprises the first K switch 5, bleeder circuit, rectification circuit, filtering circuit, output voltage smoothing circuit and the mu balanced circuit that connect successively; Wherein, first K switch 5 adopts relay, bleeder circuit is used for carrying out dividing potential drop to the voltage between the L line of Domestic electric appliances power source and N line, comprise the first electric capacity C16 and the second electric capacity C17, described first electric capacity C16 is connected with L line and N line respectively with one end of the second electric capacity C17, and the other end is connected respectively to two input ends of described rectification circuit.
In the present embodiment, because needs detect forceful electric power, the integrated component of detecting portion is all wanted directly to be connected with forceful electric power, so adopt non-isolated power supply 11.This non-isolated power supply 11 all employ electric capacity at L line and N line, utilizes the impedance operator of electric capacity to carry out dividing potential drop, and not consumed energy.Make L line and N line full symmetric like this.5V and GND is the medium voltage 110V based on L line and N line, if namely with N line for benchmark, 5V and GND sets up on the sinusoidal voltage of 110V, 5V and GND is with forceful electric power.This power delivery power is less than 0.1W, can not impact the normal work of electrical equipment.
In Fig. 2, with 5V and GND of non-insulating power supply respectively. that the 12V of weak current part powers.R59/R57 is used for current-limiting protection circuit; RV1 is used for preventing surge voltage from damaging C16/C17; C16/C17 is used for dividing potential drop; R54/R55 is used for C16/C17 and releases energy; BD1 is used for rectification, and E5 is used for filtering, and R48/N4/E2/R47 is used for smooth output voltage; R50/R52 is used for dividing potential drop, and IC9/P2/R49/R51/R53 is used for regulated output voltage.
When after relay adhesive, the electric current of L line gets back to N line by R59-C16-BD1-C17-R57, now can produce voltage at E5 two ends, and this voltage is exported by N4-R47.The reference voltage that R50/R52 dividing potential drop obtains is to 1 pin of IC9.When reference voltage is higher than 2.5V, IC9 conducting, causes P2 conducting, and an output current part flows into GND by P2-R53, achieves constant voltage effect.
The circuit structure of described forceful electric power input subelement 12, forceful electric power signal transacting subelement 13 and isolated location 2 as shown in Figure 3, if family's motor casing is charged, electric current can pass through casing, current-limiting resistance flows into N line, after this electric current is amplified by operational amplifier, then haggles over voltage comparator.Because casing electrified voltage is different, comparer exports the square wave of different duty.By comparing after integrating circuit, can obtain a fixing level to drive optocoupler, export to MCU acquisition process by optocoupler, MCU also makes corresponding action again.
Described forceful electric power input subelement 12 comprises second switch K3, the first diode D9, the first current-limiting resistance R44, the second current-limiting resistance R37, the 3rd current-limiting resistance R31 and the second diode D8; The positive pole of Household electric appliance casing, the first diode D9, the negative pole of the first diode D9, the first current-limiting resistance R44, the second current-limiting resistance R37, the 3rd current-limiting resistance R31, the positive pole of the second diode D8, the negative pole of the second diode D8 are connected successively with household electrical appliance N line, and the voltage signal that described second current-limiting resistance R37 two ends produce is described comparison signal.Second switch K3 adopts relay.
Described forceful electric power signal transacting subelement 13 comprises the operation amplifier circuit, the first voltage comparator circuit, integrating circuit and the second voltage comparator circuit that connect successively; Operation amplifier circuit is used for described comparison signal to amplify, and obtains a sinusoidal voltage (A line signal); First voltage comparator circuit is used for described sinusoidal voltage and the first DC voltage pre-set to compare, and obtains the square wave (B line signal) of certain dutycycle; Integrating circuit is used for carrying out integration to described square wave, obtains a smooth dc voltage (C line signal); Second voltage comparator circuit is used for described smooth dc voltage and the second DC voltage pre-set to compare, and obtains voltage difference detection signal (D line signal).
Isolated location 2 adopts isolation optocoupler IC6, for carrying out confession electric isolution to described voltage difference detection signal generation unit 1 and control module 3.Whole pick-up unit, by isolation optocoupler IC6, voltage difference detection signal generation unit 1 is the detection module of forceful electric power, and control module 3 is the processor module of light current.The detection module of forceful electric power uses non-isolated Power supply, comprises input and driving; The processor module of light current uses insulating power supply to power, and comprises MCU and LED instruction or hummer.
In the present embodiment, D9/R44/R37/R31/D8 is used for current limliting, IC5/C9/R29/R30/R38R/39 is used for amplified current signal, IC7/R35/R41/R45 is used for comparison signal size, R28/C12 is used for integrated signal, IC7/C10/R36/R43/R46 is used for comparison signal and drives optocoupler, and R32/IC6/R33/R34/R40/R42/N3/C11 is used for isolation and signal is imported into MCU.
In Fig. 3, being the ground wire connecing Three-hole socket, is also Household electric appliance casing current potential, the N line connecing Three-hole socket, i.e. the power supply zero line of power supply. with 5V and GND of light current." casing live detection " is the input port connecing single-chip microcomputer.IC5 is that one has internal frequency compensation, and the operational amplifier of low-power consumption, input voltage can reach 30V, and output gain can reach 100dB.IC7 is the low-loss voltage comparator of a kind of high precision, and common mode input is close to 0V, and input differential mode voltage is supply voltage, and output level can compatible TTL/CMOS flogic system.IC6 is a kind of photoelectric isolating device, and the isolated voltage between constrained input reaches 5kV, has very low starting current and very high current transfer ratio.
When casing is charged relative to the earth, be also alternating current, but alternating voltage effective value is uncertain.In the present invention, set and be namely judged as dangerous voltage more than 40VAC, and can be detected.Due to set up based on above 110VAC voltage, when casing is charged, the alternating current above casing is sinusoidal variations relative to N line.In the half period higher than N line, owing to there is voltage difference, therefore can generation current.Electric current flows into N line by D9-R44-R37-R31-D8.Little sinusoidal current produces little sinusoidal voltage at R37 two ends, after being amplified, signal is imported into IC7 by IC5.Because IC5 and IC7 has very high input impedance, so power consumption is very low.IC7 exports the square wave of certain dutycycle after the DC voltage of sinusoidal voltage and benchmark is compared.This square wave, by after integration, obtains a smoother DC voltage.And then after comparing with the reference dc voltage of comparer, export 0V voltage, cause optocoupler IC6 conducting, driving N 3 conducting, input MCU is low-voltage.When Household electric appliance casing is charged, the waveform of the sinusoidal voltage after comparison signal amplifies and the square wave after comparing output as shown in fig. 4 a; When Household electric appliance casing is charged, the smooth dc voltage obtained after carrying out integration to square wave and the waveform of voltage difference detection signal are as shown in Figure 4 b.
Control module 3, for judging that whether described Household electric appliance casing is charged according to described voltage difference detection signal, is reported to the police when casing is charged.Described control module comprises detection sub-unit 31, alarm part-unit 32 and insulating power supply 33, and described detection sub-unit 31 is connected with alarm part-unit 32.Described detection sub-unit 31 and alarm part-unit 32 adopt insulating power supply 33 to power.
Detection sub-unit 31 adopts MCU, for receiving and detecting voltage difference detection signal; When detect within the time preset have voltage difference detection signal to input always time, judge that described Household electric appliance casing is charged; When not detecting that voltage difference detection signal inputs, judge that described Household electric appliance casing is not charged.In the present embodiment, with reference to Fig. 3, when MCU detects that input port is low-voltage, can the continuous detecting time of 2 seconds.If what collected in these 2 seconds always is low-voltage, then judge that described Household electric appliance casing is charged; When MCU detects high voltage, then judge that described Household electric appliance casing is not charged, because when casing is not charged, E line and N line are equipotentials, do not have electric current or electric current very faint, so IC7 exports 5V voltage, cause optocoupler IC6 can not conducting, N3 also cannot conducting, so the voltage of input MCU is high voltage.
Alarm part-unit 32 is for reporting to the police when described Household electric appliance casing is charged, and described warning comprises pilot lamp and reports to the police and/or audible alarm.In the present embodiment, LED and hummer is adopted to report to the police.As shown in Figure 5, buzzer drive circuit as shown in Figure 6 for LED drive circuit.Wherein LED and hummer all connect the I/O port of MCU, and MCU can control this I/O port output LOW voltage, LED1 are lighted or BUZZ1 sounds.
In this programme embodiment, in MCU processing section, it is the Power supply with isolation.Because generally can with button above display panel, people can touch, and can not have forceful electric power.Use K5 and K3 relay, when being and can not carrying out detecting, disconnect relay, to reduce unnecessary power dissipation.Under the prerequisite not considering power consumption, these 2 relays of K5 and K3 can be removed, continually to detect, can report to the police immediately when going wrong, reduce cost simultaneously.
Generally all adopt 220V to power in appliance system, N line is the neutral line, not charged; L line is phase line, relative to the sinusoidal ac of N tape ± 220V.Ground wire is directly grounded, and all wants multiple grounding every a segment distance, ensures that ground connection is good.In transformer station, N line also will access the earth.N line, as the performance loop of household electrical appliances, flows into the earth after getting back to transformer station.So N line and ground wire are idiostatic, but do not communicate, N line is not charged relative to ground wire.Pick-up unit of the present invention can use as independent module, and above the control panel that also can be integrated in household electrical appliance, the wiring diagram of itself and household electrical appliance as shown in Figure 7.During warning, pilot lamp can be used to report to the police or buzzer warning.
The charged pick-up unit of Household electric appliance casing of the present invention can as a kind of standalone feature of household electrical appliances, and whether be used alone a button and perform to control this function, whether the casing that user can detect this electrical equipment is at any time charged.After the complete household electrical appliances of user installation, whether the casing that can detect electrical equipment in family is immediately charged.Also can work with this electrical equipment simultaneously always, detect in the normal use procedure of household electrical appliances, automatically detect at set intervals, can automatic alarm during generation problem.
The present invention considers the electricity owing to being in direct-detection electrical network, and understands with the humorous wave interference of a large amount of electromagnetism in electrical network, so the circuit used has fully taken into account antijamming capability.Owing to adopting the differential amplification to small-signal, so there is good rejection ability to common-mode signal interference, decrease the zero point drift caused due to temperature variation.Owing to using high-precision comparer, be also suppressed to minimum to the common-mode signal interference of input, decreased because temperature floats the offset voltage caused.Using optocoupler, is the coupling and the transmission that realize electric signal with light signal as medium, and constrained input is completely isolated on electrically, has extremely strong antijamming capability.Consider nonlinear problem and the corresponding speed problem of optocoupler, use high-speed comparator to improve the driving force of optocoupler.
When the charged pick-up unit of Household electric appliance casing of the present invention can detect that the household electrical appliances of user's family are charged in advance, and report to the police and point out user.To prevent accident generation.Instead of protect again when having an accident.
The charged pick-up unit of Household electric appliance casing of the present invention make use of the characteristic of alternating current self, sets up DC voltage based on medium voltage 110V, and circuit is simple, and cost is extremely low, and reliability is high.Electrostatic, faradic interference can not be subject to.
Although be example object, disclose the preferred embodiments of the present invention, it is also possible for those skilled in the art will recognize various improvement, increase and replacement, and therefore, scope of the present invention should be not limited to above-described embodiment.

Claims (10)

1. the pick-up unit that Household electric appliance casing is charged, is characterized in that, described device comprises:
Voltage difference detection signal generation unit, for the voltage difference according to Household electric appliance casing and household electrical appliance N line, formation voltage difference detection signal;
Control module, being connected with described voltage difference detection signal generation unit, for judging that whether described Household electric appliance casing is charged according to described voltage difference detection signal, reporting to the police when casing is charged.
2. the pick-up unit that Household electric appliance casing as claimed in claim 1 is charged, it is characterized in that, described voltage difference detection signal generation unit comprises:
Forceful electric power input subelement, for the voltage difference according to Household electric appliance casing and household electrical appliance N line, generates comparison signal;
Forceful electric power signal transacting subelement, being connected with described forceful electric power input subelement, for being processed by described comparison signal, obtaining voltage difference detection signal;
Non-isolated power supply, the medium voltage based on L line and N line generates direct supply, powers for giving described forceful electric power input subelement and forceful electric power signal transacting subelement.
3. the pick-up unit that Household electric appliance casing as claimed in claim 2 is charged, it is characterized in that, described non-isolated power supply comprises the bleeder circuit, rectification circuit, filtering circuit, output voltage smoothing circuit and the mu balanced circuit that connect successively; Wherein, described bleeder circuit is used for carrying out dividing potential drop to the voltage between the L line of Domestic electric appliances power source and N line, comprise the first electric capacity (C16) and the second electric capacity (C17), described first electric capacity (C16) is connected with L line and N line respectively with one end of the second electric capacity (C17), and the other end is connected respectively to two input ends of described rectification circuit.
4. the pick-up unit that Household electric appliance casing as claimed in claim 3 is charged, it is characterized in that, described non-isolated power supply also comprises the first switch (K5), and described first switch (K5) is connected between N line and the second electric capacity (C17).
5. the pick-up unit that Household electric appliance casing as claimed in claim 2 is charged, it is characterized in that, described forceful electric power input subelement comprises the first diode (D9), the first current-limiting resistance (R44), the second current-limiting resistance (R37), the 3rd current-limiting resistance (R31) and the second diode (D8); The positive pole of Household electric appliance casing, the first diode (D9), the negative pole of the first diode (D9), the first current-limiting resistance (R44), the second current-limiting resistance (R37), the 3rd current-limiting resistance (R31), the positive pole of the second diode (D8), the negative pole of the second diode (D8) are connected successively with household electrical appliance N line, and the voltage signal that described second current-limiting resistance (R37) two ends produce is described comparison signal.
6. the pick-up unit that Household electric appliance casing as claimed in claim 5 is charged, it is characterized in that, described forceful electric power input subelement also comprises second switch (K3), and described second switch (K3) is connected between the positive pole of Household electric appliance casing and the first diode (D9).
7. the pick-up unit that Household electric appliance casing as claimed in claim 2 is charged, it is characterized in that, described forceful electric power signal transacting subelement comprises:
Operation amplifier circuit, for being amplified by described comparison signal, obtains a sinusoidal voltage;
First voltage comparator circuit, for described sinusoidal voltage and the first DC voltage pre-set being compared, obtains square wave;
Integrating circuit, for carrying out integration to described square wave, obtains a smooth dc voltage;
Second voltage comparator circuit, for described smooth dc voltage and the second DC voltage pre-set being compared, obtains voltage difference detection signal.
8. the pick-up unit that Household electric appliance casing as claimed in claim 1 is charged, it is characterized in that, described control module comprises:
Detection sub-unit, for receiving and detecting voltage difference detection signal; When detect within the time preset have voltage difference detection signal to input always time, judge that described Household electric appliance casing is charged; When not detecting that voltage difference detection signal inputs, judge that described Household electric appliance casing is not charged;
Alarm part-unit, for reporting to the police when described Household electric appliance casing is charged.
9. the pick-up unit that Household electric appliance casing as claimed in claim 8 is charged, is characterized in that, described warning comprises pilot lamp and reports to the police and/or audible alarm.
10. the pick-up unit that the Household electric appliance casing as described in any one of claim 1 to 9 is charged, it is characterized in that, described device also comprises isolated location, be connected with described voltage difference detection signal generation unit and control module respectively, for carrying out confession electric isolution to described voltage difference detection signal generation unit and control module.
CN201510455636.XA 2015-07-30 2015-07-30 Apparatus detecting whether casing of home appliance is electrified or not Pending CN105116205A (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2447991Y (en) * 2000-05-24 2001-09-12 陈甲标 Automatic exciting voltage regulator for small generator
CN2927442Y (en) * 2006-06-01 2007-07-25 贾翱东 Locker against electric shock for household electrical appliance
CN201393050Y (en) * 2009-04-09 2010-01-27 贾翱东 Anti-electric shock device of household appliance
CN101799692A (en) * 2010-04-14 2010-08-11 宁波市镇海华泰电器厂 Water level control method and device for control signal acquired from earth
CN102332699A (en) * 2011-07-28 2012-01-25 深圳市良辉科技有限公司 Ground wire safety voltage control system
CN203350348U (en) * 2013-05-14 2013-12-18 珠海格力电器股份有限公司 Electrification detection device for ground wire, air-conditioner and electrical equipment
CN104155505A (en) * 2013-05-14 2014-11-19 珠海格力电器股份有限公司 Earth wire live detection device, air conditioner and electrical equipment

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2447991Y (en) * 2000-05-24 2001-09-12 陈甲标 Automatic exciting voltage regulator for small generator
CN2927442Y (en) * 2006-06-01 2007-07-25 贾翱东 Locker against electric shock for household electrical appliance
CN201393050Y (en) * 2009-04-09 2010-01-27 贾翱东 Anti-electric shock device of household appliance
CN101799692A (en) * 2010-04-14 2010-08-11 宁波市镇海华泰电器厂 Water level control method and device for control signal acquired from earth
CN102332699A (en) * 2011-07-28 2012-01-25 深圳市良辉科技有限公司 Ground wire safety voltage control system
CN203350348U (en) * 2013-05-14 2013-12-18 珠海格力电器股份有限公司 Electrification detection device for ground wire, air-conditioner and electrical equipment
CN104155505A (en) * 2013-05-14 2014-11-19 珠海格力电器股份有限公司 Earth wire live detection device, air conditioner and electrical equipment

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Application publication date: 20151202

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