CN106058803A - Live-line protection control device for electric water heater and housing of electric water heater - Google Patents
Live-line protection control device for electric water heater and housing of electric water heater Download PDFInfo
- Publication number
- CN106058803A CN106058803A CN201610552755.1A CN201610552755A CN106058803A CN 106058803 A CN106058803 A CN 106058803A CN 201610552755 A CN201610552755 A CN 201610552755A CN 106058803 A CN106058803 A CN 106058803A
- Authority
- CN
- China
- Prior art keywords
- circuit
- water heater
- electric
- signal
- control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/14—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to occurrence of voltage on parts normally at earth potential
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0227—Applications
- H05B1/0252—Domestic applications
- H05B1/0275—Heating of spaces, e.g. rooms, wardrobes
- H05B1/0283—For heating of fluids, e.g. water heaters
Landscapes
- Control Of Resistance Heating (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention provides a live-line protection control device for an electric water heater and a housing of the electric water heater. The device comprises a first detection circuit used for detecting whether a first leakage signal between a live wire and a zero wire of a power source exists, a second detection circuit used for detecting whether a second leakage signal between the zero wire of the power source and the water heater housing, a signal amplification circuit used for receiving the second leakage signal and amplifying the second leakage signal, and a control circuit used for receiving the first leakage signal of the first detection circuit and the amplification signal, wherein a control signal is outputted by the control circuit to a performing circuit. According to the live-line protection control device, before a human body contacts the housing, connection between the water heater and the power source is cut off when a power source end is not connected with the water heater housing, or the water heater housing is not in ground connection and a surface live-line state is detected, and before the human body contacts the housing, connection between the water heater and the power source is cut off when a live-line problem of the housing caused by connecting a wire of the water heater with a power source phase wire because of error wiring of a use socket occurs.
Description
Technical field
The invention belongs to technical field of water heaters, particularly relate to a kind of electric heater and outer casing electrification protection controls dress
Put.
Background technology
At present, the plug of a lot of families is unreliable without outer cover of water heater or ground connection.Electric heater is so caused to use
Cheng Zhong, it is easy to because water heater defective insulation or power supply wiring mistake cause appearance to leak electricity.Thus the thing of personal injury occurs into
Therefore.Therefore, user is when selecting electric heater, and the concern to security performance seems especially prominent.
Existing earth leakage protective device is not when water heater connects outer cover of water heater, and only direct body contact is leaked electricity shell
Time, ability trigger action, plays protective action, and can not protect the electrical equipment caused because of power line wrong and other supply lines
Outer casing electrification, can not reach to ensure completely in security performance.And, current electric leakage protection technology is that " residual current fills
Put ", its principle is that the electric current of detection inflow load is the most equal with the electric current flowing out load, if unequal being possible to occurs
Leaky, thus fast shut-off power supply.This residual current changes along with the change of power utilization environment, it is easy to cause malfunction
Make.It addition, earth leakage protective device on the market to be all the form with earth leakage circuit-breaker the most external, be connected to socket and electric heating
Between hydrophone, take larger volume, cause increasing and restriction spatially on cost.
Summary of the invention
It is an object of the invention to provide a kind of casing of electric water heater electrization protection and control device, solve existing electric leakage and protect
Protection unit only when direct body contact leaks electricity shell, could trigger action, there is the technical problem of potential safety hazard.
For solving above-mentioned technical problem, the present invention is achieved by the following technical solutions:
A kind of casing of electric water heater electrization protection controls device, and described electrization protection controls device and includes:
First testing circuit, for detecting whether there is the first electric leakage signal between the live wire of power supply and zero line, and by described first
Electric leakage signal transmits to control circuit；
Second testing circuit, for detecting whether there is the second electric leakage signal between the zero line of power supply and outer cover of water heater, and by institute
State the second electric leakage signal to transmit to signal amplification circuit；
Signal amplification circuit, is used for receiving described second electric leakage signal, and putting after being amplified described second electric leakage signal
Big signal transmits to control circuit；
Control circuit, for receiving the first electric leakage signal of the first testing circuit, amplifying signal, and outputs control signals to action
Perform circuit；
Action executing circuit, is used for receiving control signal and controlling on/off.
Control the design of device based on above-mentioned casing of electric water heater electrization protection, the invention allows for a kind of electric hot water
Device, described electric heater includes that above-mentioned outer cover of water heater electrization protection controls device.
Compared with prior art, advantages of the present invention and good effect are: casing of electric water heater electrization protection control of the present invention
Device processed, on the one hand, can be when power end does not connect outer cover of water heater or outer cover of water heater does not has ground connection, at human contact's shell
Before the charged situation of appearance the connection cutting off between water heater and power supply detected.On the other hand, can be wrong at user's jack connector
By mistake, when causing connecting the line misconnection power supply phase line of water heater thus causing outer casing electrification, heat can be cut off before human contact's shell
Connection between hydrophone and power supply.Another further aspect, can connect inverse time at water heater socket and power firestreak zero line, cut off water heater with
Connection between power supply.
After reading in conjunction with the accompanying the detailed description of embodiment of the present invention, the other features and advantages of the invention will become more
Add clear.
Accompanying drawing explanation
Fig. 1 is the theory diagram of specific embodiment of the invention casing of electric water heater electrization protection device.
Fig. 2 is the circuit diagram of the specific embodiment of the invention 1.
Fig. 3 is the circuit diagram of the specific embodiment of the invention 2.
Detailed description of the invention
Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is illustrated:
As shown in Figure 1, 2, the present embodiment proposes a kind of casing of electric water heater electrization protection device, is used for detecting electric heater and exists
The body leakage caused because of wiring error or defective insulation during use.Electrization protection controls device and includes: be used for detecting
First testing circuit of electric leakage signal, the second testing circuit, amplify for the signal being amplified the second testing circuit signal
Circuit, takes the action executing circuit of control measure during for judging whether the control circuit of electric leakage, for leaking electricity.Below to respectively
Individual circuit part is specifically described:
First testing circuit, for detecting whether there is the first electric leakage signal between the live wire L of power supply and zero line N, and by described the
One electric leakage signal transmits to control circuit.
Wherein, the first testing circuit includes that current transformer T2, the primary coil of current transformer T2 are connected across power supply
Between live wire L and zero line N.
Second testing circuit, for detecting whether there is the second electric leakage signal between the zero line N of power supply and outer cover of water heater G,
And described second electric leakage signal is transmitted to signal amplification circuit.
Wherein, the second testing circuit includes that current transformer T1, the primary coil of current transformer T1 are connected across power supply
Between zero line N and outer cover of water heater G.
When occurring without electric leakage, electric current passes through the current phasor of primary coil and adds up to zero, therefore in secondary wire
Corresponding induction electromotive force can not be produced on Quan.If it occur that leaky, the current phasor of primary coil and be not equal to zero, just
Can make to produce on secondary coil induction electromotive force, electric leakage signal be detected.
Signal amplification circuit, for receiving the second electric leakage signal, and the amplification letter after the second electric leakage signal is amplified
Number transmission to control circuit.Owing to electric leakage signal when outer cover of water heater leaks electricity may be less, in order to prevent missing inspection, arrange herein
Signal amplification circuit.
Control circuit, for receiving the first electric leakage signal of the first testing circuit, amplifying signal, and outputs control signals to
Action executing circuit.
Control circuit includes that MCU, electric leakage signal are input to the A/D port of MCU, and MCU monitors electric leakage signal in real time, simultaneously with
The rated residual operating current being linked into MCU compares, it is determined whether electric leakage, outputs control signals to action executing circuit.
Or, control circuit includes comparison circuit and MCU, and specified electric leakage input circuit input rated residual operating current is extremely
The comparison circuit of control circuit；Comparison circuit will receive rated residual operating current and the first electric leakage signal, amplify signal and carry out
Relatively, it is determined whether electric leakage, and by the MCU, MCU of comparative result output to control circuit action executing electricity is output control signals to
Road.
Wherein, rated residual operating current can be the concrete numerical value controlled in software of write MCU in advance.Or,
Casing of electric water heater is charged includes that controlling device increases specified electric leakage input circuit, is used for inputting rated residual operating current to control
Circuit processed.
In the present embodiment, specified electric leakage input circuit includes connecting fixed resistance R4 in circuit and variable resistance R3, Gu
Determine to be connected to MCU, MCU by wire between resistance R4 and variable resistance R3 to gather between fixed resistance R4 and variable resistance R3
Current signal is as rated residual operating current.Rated residual operating current can be adjusted by changing variable-resistance size
Size.
Action executing circuit, action executing circuit includes on/off circuit, heats component open-closed circuit, temperature controller break-make
Circuit and alarm module.On/off circuit is used for receiving control signal and controlling on/off, in order to cut in time when electric leakage
Power-off source, it is to avoid user gets an electric shock；Heat component open-closed circuit for receiving control signal and controlling to heat the logical of assembly and power supply
Disconnected；Temperature controller on-off circuit is for receiving control signal and controlling the break-make of temperature controller and power supply；Alarm module is used for controlling report
The break-make of alert module, in order to when electric leakage and alarm, reminds user to process.
Preferably, as it is shown on figure 3, casing of electric water heater electrization protection device includes filter circuit, for the leakage to detection
The signal of telecommunication is filtered processing, and with filtering interfering, improves degree of accuracy.
Concrete, filter circuit includes:
First filter circuit, between the first testing circuit and control circuit, for first to the first testing circuit output
Electric leakage signal is filtered being processed and transmitted to control circuit；
Second filter circuit, between signal amplification circuit and control circuit, for the amplification to signal amplification circuit output
Signal is filtered being processed and transmitted to control circuit.
After electric heater and power on, the electric current between live wire and the zero line of the first testing circuit monitoring power supply, second
Electric current between zero line and the outer cover of water heater of testing circuit monitoring power supply, and the electric current of monitoring is transmitted after signal processing
To control circuit, the electric current of monitoring is compared by control circuit with rated residual operating current, if one of them monitoring current
Value is more than rated residual operating current, and control circuit outputs control signals to action executing circuit, controls alarm module and reports to the police, electricity
Source is all off with all modules of electric heater.
Certainly, the present embodiment also can be between live wire L and zero line N, arrange rectified current between zero line N and outer cover of water heater G
Road, rectification circuit output rectified signal is to the first testing circuit and the second testing circuit.
The casing of electric water heater electrization protection device of the present embodiment, even if not having earth lead or hot water at user's power end
In the case of device shell does not has ground connection, the either bad outer casing electrification caused of electric heater built-in electrical insulation or power supply and electric heating
The body leakage that wiring error between hydrophone causes, all can detect shell band before human body contacts with charged shell
Electricity situation, and cut off the electricity supply by control circuit and connection between electric heater.The electric leakage action of this protection device does not require to use
Family power supply must earth lead；Once electric leakage, it is possible to detect electric leakage immediately, and cut off the electricity supply rather than human contact at once
Electric leakage can be detected, it is to avoid Danger Electric shock risk during charged shell.
Control the design of device based on above-mentioned casing of electric water heater electrization protection, the present embodiment also proposed a kind of electric hot water
Device, electric heater includes above-mentioned outer cover of water heater electrization protection device.Wherein, electric heater includes being positioned at electric water heater shell
Internal control circuit plate, outer cover of water heater electrization protection device is integrated on the control circuit plate of electric heater, can be very big
Ground is saved space and reduces cost.
Last it is noted that above example is only in order to illustrate technical scheme, it is not intended to limit；Although
With reference to previous embodiment, the present invention is described in detail, it will be understood by those within the art that: it still may be used
So that the technical scheme described in foregoing embodiments to be modified, or wherein portion of techniques feature is carried out equivalent；
And these amendment or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical scheme spirit and
Scope.
Claims (10)
1. a casing of electric water heater electrization protection controls device, it is characterised in that described electrization protection controls device and includes:
First testing circuit, for detecting whether there is the first electric leakage signal between the live wire of power supply and zero line, and by described first
Electric leakage signal transmits to control circuit；
Second testing circuit, for detecting whether there is the second electric leakage signal between the zero line of power supply and outer cover of water heater, and by institute
State the second electric leakage signal to transmit to signal amplification circuit；
Signal amplification circuit, is used for receiving described second electric leakage signal, and putting after being amplified described second electric leakage signal
Big signal transmits to control circuit；
Control circuit, for receiving the first electric leakage signal of the first testing circuit, amplifying signal, and outputs control signals to action
Perform circuit；
Action executing circuit, is used for receiving control signal and controlling on/off.
Casing of electric water heater electrization protection the most according to claim 1 controls device, it is characterised in that described device also wraps
Include:
First filter circuit, between the first testing circuit and control circuit, for first to the first testing circuit output
Electric leakage signal is filtered being processed and transmitted to control circuit；
Second filter circuit, between signal amplification circuit and control circuit, for the amplification to signal amplification circuit output
Signal is filtered being processed and transmitted to control circuit.
Casing of electric water heater electrization protection the most according to claim 1 controls device, it is characterised in that described device includes
Alarm module, described action executing circuit is additionally operable to control the break-make of alarm module.
Casing of electric water heater electrization protection the most according to claim 3 controls device, it is characterised in that described device includes
Heating component open-closed circuit and/or temperature controller on-off circuit, described action executing circuit is additionally operable to control to heat component open-closed electricity
Road and/or the break-make of temperature controller on-off circuit.
5. control device according to the casing of electric water heater electrization protection described in claim 1-4 any one, it is characterised in that institute
State device and include specified electric leakage input circuit, be used for inputting rated residual operating current to control circuit.
6. control device according to the casing of electric water heater electrization protection described in claim 1-4 any one, it is characterised in that institute
State device to include:
Specified electric leakage input circuit, for inputting the comparison circuit of rated residual operating current extremely described control circuit；
Comparison circuit, for receiving rated residual operating current and the first electric leakage signal, amplifies signal and compares, and will compare
Relatively result exports the MCU to control circuit.
7. control device according to the casing of electric water heater electrization protection described in claim 1-4 any one, it is characterised in that institute
Stating between live wire and zero line, arrange rectification circuit between zero line and outer cover of water heater, described rectification circuit output rectified signal is extremely
Described first testing circuit and the second testing circuit.
8. control device according to the casing of electric water heater electrization protection described in claim 1-4 any one, it is characterised in that institute
State the first testing circuit and the second testing circuit all includes current transformer.
9. an electric heater, it is characterised in that described electric heater includes the water heater described in claim 1-8 any one
Outer casing electrification protection controls device.
Electric heater the most according to claim 9, it is characterised in that described electric heater includes control circuit plate, described
Outer cover of water heater electrization protection controls device and is integrated on the control circuit plate of described electric heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610552755.1A CN106058803A (en) | 2016-07-14 | 2016-07-14 | Live-line protection control device for electric water heater and housing of electric water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610552755.1A CN106058803A (en) | 2016-07-14 | 2016-07-14 | Live-line protection control device for electric water heater and housing of electric water heater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106058803A true CN106058803A (en) | 2016-10-26 |
Family
ID=57186348
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610552755.1A Pending CN106058803A (en) | 2016-07-14 | 2016-07-14 | Live-line protection control device for electric water heater and housing of electric water heater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106058803A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111765649A (en) * | 2020-07-14 | 2020-10-13 | 广东格美淇电器有限公司 | Electric water heater with voltage induction type leakage protection and alarm method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2591520Y (en) * | 2002-12-20 | 2003-12-10 | 浙江康泉电器有限公司 | Electric water heater with omnibearing electricity leakage protection function |
| JP2006352955A (en) * | 2005-06-13 | 2006-12-28 | Otowa Denki Kogyo Kk | Leakage protective relay |
| CN101257202A (en) * | 2007-12-21 | 2008-09-03 | 谢帮华 | Electricity-leakage-proof protectors |
| CN204044235U (en) * | 2014-09-05 | 2014-12-24 | 航天长峰朝阳电源有限公司 | Exchange the adjustable protection warning circuit of input leakage current current value |
| CN205753346U (en) * | 2016-07-14 | 2016-11-30 | 广东海信家电有限公司 | A kind of electric heater and outer casing electrification protection thereof control device |
-
2016
- 2016-07-14 CN CN201610552755.1A patent/CN106058803A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2591520Y (en) * | 2002-12-20 | 2003-12-10 | 浙江康泉电器有限公司 | Electric water heater with omnibearing electricity leakage protection function |
| JP2006352955A (en) * | 2005-06-13 | 2006-12-28 | Otowa Denki Kogyo Kk | Leakage protective relay |
| CN101257202A (en) * | 2007-12-21 | 2008-09-03 | 谢帮华 | Electricity-leakage-proof protectors |
| CN204044235U (en) * | 2014-09-05 | 2014-12-24 | 航天长峰朝阳电源有限公司 | Exchange the adjustable protection warning circuit of input leakage current current value |
| CN205753346U (en) * | 2016-07-14 | 2016-11-30 | 广东海信家电有限公司 | A kind of electric heater and outer casing electrification protection thereof control device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111765649A (en) * | 2020-07-14 | 2020-10-13 | 广东格美淇电器有限公司 | Electric water heater with voltage induction type leakage protection and alarm method thereof |
| CN111765649B (en) * | 2020-07-14 | 2021-11-05 | 广东格美淇电器有限公司 | Electric water heater with voltage induction type leakage protection and alarm method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9312680B2 (en) | Leakage current detection interrupter with self-testing function and over-temperature protection function | |
| CN103545786B (en) | A kind of protective device of leakage current | |
| CN205900958U (en) | Intelligent security socket with child protection function | |
| CN101000987A (en) | Power plug with temp monitoring function | |
| CN102927690A (en) | Water heater and electric leakage and dry burning prevention detection method thereof | |
| US20190030983A1 (en) | Charging system with thermal protection | |
| CN205753346U (en) | A kind of electric heater and outer casing electrification protection thereof control device | |
| CN105337252B (en) | Earth leakage protective device with self-checking function | |
| CN105759172B (en) | Active earthed system abnormal detector and method | |
| CN106058803A (en) | Live-line protection control device for electric water heater and housing of electric water heater | |
| CN106655389A (en) | Charging protection method, device and circuit | |
| CN109449687A (en) | A kind of power supply line with pin temperature detection | |
| KR20160001084U (en) | Abnormal over-heating preventing device of microUSB connector plug | |
| CN108023330B (en) | Leakage protection method, apparatus and water heater | |
| CN202149937U (en) | Electric energy meter calibrating device and calibrating system | |
| CN103065883A (en) | Intelligent high-voltage direct-current relay | |
| CN111435037A (en) | Electric water heater and electric leakage detection method thereof | |
| CN205811190U (en) | A kind of plug-in type kitchen appliance is by anti-short circuit terminals protection device | |
| CN204925229U (en) | Domestic appliance warning device that leaks electricity | |
| CN102904210A (en) | Leakage protection method, leakage protection device and water heater | |
| CN201378193Y (en) | Ground wire detecting device | |
| CN208507367U (en) | A kind of safety guard of for transformer | |
| CN208908355U (en) | A kind of safe earth leakage protective device | |
| CN206338952U (en) | Water heater | |
| CN112834951A (en) | Electric leakage detection circuit, electric leakage protection circuit and household appliance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20161026 |
|
| RJ01 | Rejection of invention patent application after publication |