CN205753346U - A kind of electric heater and outer casing electrification protection thereof control device - Google Patents

A kind of electric heater and outer casing electrification protection thereof control device Download PDF

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Publication number
CN205753346U
CN205753346U CN201620739637.7U CN201620739637U CN205753346U CN 205753346 U CN205753346 U CN 205753346U CN 201620739637 U CN201620739637 U CN 201620739637U CN 205753346 U CN205753346 U CN 205753346U
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China
Prior art keywords
circuit
electric
water heater
signal
control
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CN201620739637.7U
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Chinese (zh)
Inventor
汪亮
郭军波
杨世恩
宋永刚
高民
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GUANGDONG HISENSE HOME APPLIANCES Co Ltd
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GUANGDONG HISENSE HOME APPLIANCES Co Ltd
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Abstract

This utility model provides a kind of electric heater and outer casing electrification protection controls device; electrization protection controls device and includes: whether have the first testing circuit of the first electric leakage signal between live wire and the zero line of detection power supply; the second testing circuit of the second electric leakage signal whether is had between zero line and the outer cover of water heater of detection power supply; receive the second electric leakage signal the signal amplification circuit that the second electric leakage signal is amplified; receiving the first electric leakage signal of the first testing circuit, amplify the control circuit of signal, control circuit outputs control signals to action executing circuit.This utility model can detect the charged situation of appearance the connection cutting off between water heater and power supply when power end does not connect outer cover of water heater or outer cover of water heater does not has ground connection before human contact's shell.Can also be in user's jack connector mistake, when causing connecting the line misconnection power supply phase line of water heater thus causing outer casing electrification, the connection between water heater and power supply can be cut off before human contact's shell.

Description

A kind of electric heater and outer casing electrification protection thereof control device
Technical field
This utility model belongs to technical field of water heaters, particularly relates to a kind of electric heater and outer casing electrification protection control thereof Device processed.
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
The purpose of this utility model is to provide a kind of casing of electric water heater electrization protection to control device, solves existing leakage Electrical protective device 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, this utility model 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 Described second electric leakage signal is transmitted to signal amplification circuit;
Signal amplification circuit, is used for receiving described second electric leakage signal, and after described second electric leakage signal is amplified Amplification signal transmit 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 executing 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, this utility model also proposed a kind of electric heating Hydrophone, described electric heater includes that above-mentioned outer cover of water heater electrization protection controls device.
Compared with prior art, advantage of the present utility model and good effect are: this utility model casing of electric water heater band Electric protection controls device, 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 body The charged situation of appearance the connection cutting off between water heater and power supply is detected before contact shell.On the other hand, can insert user Seat wiring error, when causing connecting the line misconnection power supply phase line of water heater thus causing outer casing electrification, can be at human contact's shell Before, cut off the connection between water heater and power supply.Another further aspect, can connect inverse time at water heater socket and power firestreak zero line, cut Disconnected connection between water heater and power supply.
After reading in conjunction with the accompanying the detailed description of this utility model embodiment, other features of the present utility model and advantage Will become clearer from.
Accompanying drawing explanation
Fig. 1 is the theory diagram of this utility model specific embodiment casing of electric water heater electrization protection device.
Fig. 2 is the circuit diagram of this utility model specific embodiment 1.
Fig. 3 is the circuit diagram of this utility model specific embodiment 2.
Detailed description of the invention
Below in conjunction with the accompanying drawings detailed description of the invention of the present utility model 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 hot water The body leakage that device in use causes because of wiring error or defective insulation.Electrization protection controls device and includes: be used for Detection the first testing circuit of electric leakage signal, the second testing circuit, for the signal being amplified the second testing circuit signal Amplifying circuit, takes the action executing circuit of control measure during for judging whether the control circuit of electric leakage, for leaking electricity.Below Each 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 institute State the first electric leakage signal to transmit 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 the first testing circuit output First electric leakage signal is filtered being processed and transmitted to control circuit;
Second filter circuit, between signal amplification circuit and control circuit, for signal amplification circuit output Amplify signal to be 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 the technical solution of the utility model, it is not intended to limit; Although this utility model being described in detail with reference to previous embodiment, it will be understood by those within the art that: Technical scheme described in foregoing embodiments still can be modified by it, or carries out wherein portion of techniques feature With replacing;And these amendments or replacement, do not make the essence of appropriate technical solution depart from this utility model each embodiment technology The spirit and scope of scheme.

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.
CN201620739637.7U 2016-07-14 2016-07-14 A kind of electric heater and outer casing electrification protection thereof control device Active CN205753346U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201620739637.7U CN205753346U (en) 2016-07-14 2016-07-14 A kind of electric heater and outer casing electrification protection thereof control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201620739637.7U CN205753346U (en) 2016-07-14 2016-07-14 A kind of electric heater and outer casing electrification protection thereof control device

Publications (1)

Publication Number Publication Date
CN205753346U true CN205753346U (en) 2016-11-30

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CN201620739637.7U Active CN205753346U (en) 2016-07-14 2016-07-14 A kind of electric heater and outer casing electrification protection thereof control device

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106058803A (en) * 2016-07-14 2016-10-26 广东海信家电有限公司 Live-line protection control device for electric water heater and housing of electric water heater
CN109217236A (en) * 2017-06-29 2019-01-15 芜湖美的厨卫电器制造有限公司 Gas heater and its protective device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106058803A (en) * 2016-07-14 2016-10-26 广东海信家电有限公司 Live-line protection control device for electric water heater and housing of electric water heater
CN109217236A (en) * 2017-06-29 2019-01-15 芜湖美的厨卫电器制造有限公司 Gas heater and its protective device

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